CN101663547A - Branch pipe device - Google Patents

Abstract

A branch pipe device comprises a branch pipe body (1) having a small diameter joint (3) of a circular cross-section at one end, and a large diameter joint (4) of a flat elliptic cross-section at the other end where mutually parallel plane portions (5) extending in the direction intersecting the axial direction perpendicularly and a curved surface portion (6) coupling the opposite ends of the planeportions (5) are formed, and two connection pipes (10) inserted into the large diameter joint (4) of the branch pipe body (1) under a mutually adhering state and secured in place. In the cross-section at the end of the connection pipe (10) connected with the large diameter joint (4), the portion facing the plane portion (5) of the large diameter joint (4) is a second plane portion (13), the portion where the connection pipes face each other is a first plane portion (12), and the portion facing the curved surface portion (6) of the large diameter joint (4) is formed as a curved surface portion(11). Consequently, the end shape of the connection pipe (10) being inserted thereinto can be enlarged as compared with the prior art, and pressure loss can be reduced by minimizing variation in fluid flowing area.

Description

branch pipe device

technical field

The present invention relates to an improvement of a branch pipe device that is used, for example, in an air conditioner in which a plurality of outdoor units and a plurality of indoor units are connected by a refrigerant piping device, and that constitutes a part of the refrigerant piping device.

Background technique

There is an air conditioner installed in a medium-sized building such as a tall building or a factory having a plurality of places to be temperature-regulated. Such an air conditioner includes a plurality of outdoor units arranged outdoors, and indoor units respectively installed in a plurality of places where temperature is to be adjusted, and these outdoor units and indoor units are communicated via refrigerant piping.

The above-mentioned refrigerant piping device includes refrigerant pipes connected to the respective outdoor units, and main pipes connected to the refrigerant pipes via adapters serving as pipe connectors. It also has a refrigerant pipe connected to each indoor unit, and a plurality of branch pipe devices and branch pipe sockets connecting the refrigerant pipe to the main pipe.

In particular, the branch pipe device is composed of a substantially Y-shaped branch pipe main body and two connecting pipes connected to the branch pipe main body. The branch pipe device can divert the refrigerant introduced into one end of the branch pipe main body into two connecting pipes, so that the refrigerant is branched to each indoor unit by means of a plurality of branch pipe devices. Or direct the return refrigerant from the indoor unit to the outdoor unit.

The aforementioned branch pipe device has, for example, a configuration disclosed in Utility Model Registration No. 3118033. That is, in the branch pipe main body, the branch insertion portion at one end is formed as a large-diameter tubular portion the size of the pipe material itself, and the other end is necked to form a small-diameter tubular portion. The ends of the connecting pipes are shaped so as to correspond to the inner diameter of the large-diameter tubular portion of the branch pipe main body, and are inserted and fixed in a state of mutual close contact.

However, in the branch pipe body disclosed in Utility Model Registration No. 3118033, the cross-sectional shape of the small-diameter tubular portion is circular, and the cross-sectional shape of the large-diameter tubular portion is circular. Therefore, only the ends of the two connecting pipes inserted into the large-diameter tubular portion are processed into a semicircular cross-section by die forging or the like, and most of them are circular except for the ends.

In the branch pipe device, the refrigerant guided to the small-diameter tubular portion of the branch pipe main body is led out to each connecting pipe from the large-diameter tubular portion. As for the refrigerant flow area, since the end of the connecting pipe connected to the large-diameter tubular part is formed into a semicircle, the refrigerant flow area is suddenly reduced, and the end of the connecting pipe connected to the refrigerant pipe is round, so the refrigerant The circulation area increases.

As a result, the refrigerant flow area in the branch pipe device is shaped so as to greatly vary, and the pressure loss of the refrigerant passing through the branch pipe device increases, thereby affecting the air-conditioning capability.

Contents of the invention

Therefore, the object of the present invention is to provide a branch pipe device, which can expand the size of the branch pipe to be inserted compared with the conventional branch pipe by setting the cross-section of the large-diameter connecting portion of the branch pipe body to be flat and oblong. The shape of the end of the connecting pipe minimizes the change of liquid flow area, reduces pressure loss and improves reliability.

In order to meet the above object, the branch pipe device of the present invention includes a branch pipe main body and two connecting pipes, wherein the branch pipe main body has a small-diameter connecting part with a circular cross-section at one end, and a flat oblong cross-section at the other end. The large-diameter connection part is formed with parallel flat parts extending in the direction perpendicular to the axial direction and curved parts connecting the two ends of the flat part, and the two connecting pipes are inserted and fixed to the branch in a state of being tightly fitted to each other. In the large-diameter connecting portion of the pipe main body, among the cross-sectional shapes of the above-mentioned connecting pipe end connected to the large-diameter connecting portion, the portion facing the planar portion of the large-diameter connecting portion and the portion facing each other of the connecting pipe are planar portions, and A portion opposed to the curved surface of the large-diameter connection portion is formed as a curved surface.

Description of drawings

Fig. 1 is a front view showing a branch pipe device according to a first embodiment of the present invention.

Fig. 2 is a front view showing a branch pipe main body incorporated in the branch pipe device.

Fig. 3A is a side view showing one end side of the branch pipe main body.

Fig. 3B is a side view showing the other end side of the branch pipe main body.

4 is a cross-sectional view showing a state where a pair of connecting pipes are inserted into the large-diameter connecting portion of the branch pipe main body.

Fig. 5 is a schematic configuration diagram showing an air conditioner including the branch pipe device.

Detailed ways

Next, in order to describe the first embodiment of the present invention with reference to the drawings, the branch pipe device S is used as a component of the refrigerant piping device R in the air conditioner K.

First, the schematic structure of the air conditioner K is demonstrated based on FIG. 5. FIG. The air conditioner K shown here is preferably used in medium-sized buildings with a plurality of places to be air-conditioned.

The air conditioner K is composed of a plurality of outdoor units 100 arranged outdoors, a plurality of indoor units 200 installed in a place to be conditioned (air-conditioned room) in a building, and a refrigerating unit that communicates each outdoor unit 100 with the indoor unit 200. Agent piping device R constitutes. Normally, the refrigerant piping is composed of 2 main piping systems of 1 gas side piping system and 1 liquid side piping system, or 3 main piping systems of 2 gas side piping systems and 1 liquid side piping system The apparatus R is explained by taking the main piping of any one of the above-mentioned systems as an example in FIG. 5 . A part of the refrigerant piping device R includes a branch pipe device S which will be described later.

It is not limited that all the above-mentioned outdoor units 100 are collectively arranged at the same location, but one or more outdoor units 100 are arranged at a location separated from other outdoor units 100 or at a location with a height difference according to the outdoor situation. The refrigerant pipe Pa constituting the refrigerant piping device R is connected to these outdoor units 100 .

The main pipe Pb is connected to the end of each refrigerant pipe Pa via a T-shaped branch adapter d. The main pipe Pb extends from the outside into the building, and is connected to the first branch pipe Sa as the branch pipe device S provided there. The said 1st branch pipe Sa has a Y shape, and the said main pipe Pb is connected to the connection part of the one end side.

Branch pipes Pc are respectively connected to two connecting portions on the other end side of the first branch pipe Sa, and one branch pipe Pc is connected to the base end portion of the branch socket e. The branch socket e has a plurality of connecting parts, and the other connecting parts except one connecting part communicate with the indoor unit 200 via the indoor unit connecting pipe Pd.

The remaining connection portion of the branch socket e communicates with the two indoor units 200 via the connection pipe Pd and the second branch pipe Sb as the branch pipe device S. A third branch pipe Sc as a branch pipe device S is connected to the other branch pipe Pc connected to the first branch pipe Sa, and one connection part of the third branch pipe Sc communicates with the indoor unit 200 through the indoor unit connection pipe Pe. .

The other connecting portion of the third branch pipe Sc is connected to the third branch pipe Sc as the branch pipe device S via the branch pipe Pf. Hereinafter, one connection part of the third branch pipe Sc communicates with the indoor unit 200 through the indoor unit connection pipe Pe, and the other connection part communicates with the third branch pipe Sc as the branch pipe device S through the third branch pipe Sc and the branch pipe Pf. connect.

In the final third branch pipe Sc, the two connection parts are connected to the indoor unit 200 via the indoor unit pipe Pe. Thus, the plurality of outdoor units 100 and the plurality of indoor units 200 of the air conditioner K are communicated via the refrigerant piping device R having the branch pipe device S. As shown in FIG.

Next, the branch pipe device S constituting the refrigerant piping device R will be described.

Fig. 1 is a configuration diagram of a branch pipe device S, which is partially cut away and shown.

This branch pipe device S is composed of one branch pipe main body 1 and two connecting pipes 10 . That is, one end of the two connecting pipes 10 is inserted into one end of the branch pipe main body 1, and connected integrally by, for example, brazing. The two-dot chain line drawn around the branch pipe device S indicates the heat insulator D attached to the branch pipe device S. As shown in FIG.

The heat insulator D is divided into upper and lower parts, and is installed so as to sandwich the branch pipe device S. As shown in FIG. In addition, the length of the heat insulating material D in the longitudinal direction is set to be longer than the length of the branch pipe device S in the longitudinal direction. Thus, deformation of the end portion of the branch pipe device S can be prevented in the event that the branch pipe device S is accidentally dropped during transportation or the like.

2 is a front view showing the branch pipe body 1 constituting the branch pipe device S, FIG. 3A is a side view showing one end side of the branch pipe body 1 , and FIG. 3B is a side view showing the other end side of the branch pipe body 1 .

The above-mentioned branch pipe main body 1 has a small-diameter connection part 3 with a circular cross-section at one end of a straight pipe part 2 formed in a circular cross-section and straight in the axial direction. The inner diameter of the larger inner diameter is expanded and formed. The other end of the straight pipe portion 2 is provided with a large-diameter connection portion 4 which will be described later. The cross-section of the large-diameter connection portion 4 is shaped like a flattened ellipse.

The large-diameter connecting portion 4 includes planar portions 5 extending in a direction perpendicular to the axial direction of the straight pipe portion 2 and parallel to each other, and semicircular curved portions 6 connecting both ends of the planar portions 5 . The planar portion 5 has an interval corresponding to the inner diameter of the straight pipe portion 2 , and the length of the planar portion 5 in the longitudinal direction corresponds to the diameter of the straight pipe portion 2 . The radius of the curved portion 6 is shaped to match the radius of the straight pipe portion 2 .

Therefore, by performing, for example, bulging processing on the end of the straight pipe portion 2, the above-mentioned large-diameter connecting portion 4 is expanded into a flat oblong cross-sectional shape with semicircular ends and a flat middle portion. Also, the central portion of the swollen portion can be formed by dividing in a direction perpendicular to the axial direction.

In particular, a protruding portion 7 protruding axially inward is integrally provided in the middle portion of the planar portion 5 in the large-diameter connecting portion 4 . In other words, the planar portion 5 is divided with the protruding portion 7 as a boundary, and the end portion of each divided side has a curved portion 6 . The projecting amount of the protrusions 7 may be small, but must be formed to be the same as each other.

The ends of the two connecting pipes 10 are inserted into the large-diameter connecting portion 4 of the branch pipe main body 1 . FIG. 4 is a cross-sectional view showing a state where two ends of the connecting pipe 10 are inserted into the large-diameter connecting portion 4 .

In a direction perpendicular to the axial direction, the cross-sectional shape of the end of the connecting pipe 10 is: one end is a semicircular curved surface 11 , and the other end opposite to the curved surface 11 is a flat surface 12 . These curved surface portions 11 and surface portions 12 are connected by flat surface portions 13 facing each other in parallel. In other words, the planar parts 12 and 13 are combined so that the cross section is U-shaped, and the open ends thereof are closed by the curved part 11 .

For convenience of description, the planar part 12 positioned to face the curved part 11 is referred to as a "first planar part". The flat portion 13 provided in a direction perpendicular to the first flat portion 12 and connecting the curved portion 11 and the end of the first flat portion 12 is referred to as a "second flat portion". Therefore, a pair of second planar portions 13 parallel to each other is provided.

The cross-sectional shapes of the one ends of the two connecting pipes 10 are as described above, and the cross-sectional shapes of the other ends are circular. That is, each connecting pipe 10 is an ordinary pipe with a circular cross section, and one end thereof is formed by flare processing as shown in FIG. 4 . These end portions are inserted into the large-diameter connection portion 4 of the branch pipe main body 1 and fixed by means such as brazing.

Specifically, the first planar portions 12 of the connecting pipes 10 are tightly bonded to each other. In this state, each connecting pipe 10 has a long cross-sectional flat oblong shape between the curved surface portions 11 of each other. Afterwards, the curved surface 11 of each connecting pipe 10 and the curved surface 6 on the large-diameter connecting portion 4 of the branch pipe body 1 face each other, thereby inserting the ends of the two connecting pipes 10 into the large-diameter connecting portion 4 .

The ends of the connecting pipes 10 are inserted with the protrusions 7 provided in the middle of the large-diameter connecting portion planar portion 5 as a boundary. The first planar portion 12 of each connecting pipe 10 is directly opposed to each other closely, the second planar portion 13 is closely opposed to the planar portion 5 of the large-diameter connecting portion 4 , and the curved surface 11 of each connecting pipe 10 is closely opposed to the curved surface of the large-diameter connecting portion 4 . 6 are closely opposite.

The protrusion 7 provided on the large-diameter connecting portion planar portion 5 is inserted between the corner portions 14 formed by the first planar portion 12 and the second planar portion 13 of each connecting pipe 10 . Therefore, in the state where the first flat parts 12 of the connecting pipes 10 are closely opposed to each other, there is a gap between the opposing corner parts 14, and in the state where the ends of the connecting pipes 10 are inserted into the large-diameter connecting part 4 , there is no gap between the corners 14 .

The end of each connecting pipe 10 is inserted into and preliminarily held in the large-diameter connecting portion 4 of the branch pipe main body 1 , and brazing is performed along the end of the large-diameter connecting portion 4 . At the same time, the connecting pipes 10 are installed and fixed on the branch pipe main body 1 to obtain the branch pipe device S. Since the connecting pipe 10 and the entire outer periphery of the large-diameter connecting portion 4 are closely bonded to each other, it is easy to contain brazing material, and brazing processing can be reliably performed.

For example, when the large-diameter connecting portion 4 is not provided with the protrusion 7 but is a single flat portion 5, a gap is generated between the flat portion 5 and the corner portion 14, so it is necessary to fill the gap with solder. However, since the protrusions 7 are inserted between the corners 14 of the connecting pipe 10, there is no gap, and the work of filling with brazing material is unnecessary.

In this way, the branch pipe device S is formed, and then installed as shown in FIG. 5 . The refrigerant is guided from the pipe connected to the small-diameter connection part 3 to the straight pipe part 2 and further guided to the large-diameter connection part 4 . Then, it is guided to be inserted into and fixed to the connecting pipes 10 on the large-diameter connecting portion 4 , guided to the refrigerant pipes connected to these connecting pipes 10 , and introduced into the indoor unit 200 .

In addition, in the branch pipe device S, the piping connected to the small-diameter connecting portion 3 and the straight pipe portion 2 have the same refrigerant flow area, so there is no pressure loss there. The refrigerant is guided from the straight pipe portion 2 to the large-diameter connecting portion 4 to flow into the end of the connecting pipe 10 . The size of the refrigerant flow area at the end of each connecting pipe 10 is slightly larger than the refrigerant flow area of the straight pipe portion 2 , not too large.

Therefore, when the refrigerant is guided from the straight pipe portion 2 to the end portion of the connecting pipe 10, there is only a small pressure loss. When the refrigerant coming out of the end of the connecting pipe 10 is guided to the circular section, the change of the refrigerant flow area is small, so the pressure loss is also small. As a result, the branch pipe device S can enlarge the refrigerant flow area, make the pressure loss of the refrigerant small, and improve the heat exchange performance and reliability.

In addition, the flow of the refrigerant from the outdoor unit to the indoor unit has been described above, but actually the refrigerant also flows back from the indoor unit 200 to the outdoor unit 100 . Here too, the branch pipe device S is provided, and the refrigerant flows in the opposite direction to the above. In this case, the pressure loss of the refrigerant is also small, and improvements in heat exchange performance and reliability can be obtained.

In addition, although the description has been made in such a manner that the branch pipe device S is installed in the refrigerant piping device R constituting the air-conditioning device K to guide the refrigerant, it is not limited to this, and may be provided in a piping device that guides other fluids. middle.

Moreover, the present invention is not limited by the above-mentioned embodiment itself. In the implementation stage, specific modifications can be made to the constituent elements within the range not departing from the subject matter. Various constituent elements can be formed by appropriately combining a plurality of constituent elements disclosed in the above-mentioned embodiment. invention.

Industrial availability

According to the present invention, the flow area of the fluid can be enlarged, the pressure loss can be reduced, and the reliability can be improved.

Claims (2)

1. a branch pipe device is characterized in that, comprises branched pipe main body and 2 tube connectors,

Described branched pipe main body at one end has the cross section and is circular path connecting portion, and have the cross section at the other end is flat oblong big footpath connecting portion, and should be formed with along the planar portions parallel to each other of direction extension perpendicular to axial direction and the curved face part that links these planar portions two ends by big footpath connecting portion;

Described 2 tube connectors are inserted in the described big footpath connecting portion of described branched pipe main body under the state of driving fit each other and are fixed,

The cross sectional shape of end that is connected in the described tube connector of described big footpath connecting portion constitutes: part and the described tube connector respect to one another part relative with the planar portions of described big footpath connecting portion are planar portions, and relative with the curved face part of described big footpath connecting portion partially-formed be curved face part.

2. branch pipe device according to claim 1 is characterized in that,

Planar portions mid portion in the connecting portion of the big footpath of described branched pipe main body is provided with outstanding to the inside vertically jut.

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