JPH0651728U - Piping structure of air conditioner indoor unit - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the drainage that condenses on the refrigerant piping in the indoor unit from leaking to the outside. [Structure] One end of a refrigerant pipe 23 built in an indoor unit 21 is bent from a vertical direction to a horizontal direction to penetrate a partition plate 22 and extend to the outside. The drain 2 of the indoor heat exchanger is provided below the bent portion of the refrigerant pipe 23 to the horizontal portion 23a.
The one open end of the drain tray 28 for receiving 7 is positioned. The horizontal portion 23 of the refrigerant pipe 23 located above the drain tray 28
The outer pipe portion 23a2, which is divided in the diametrical direction at a, expands one opening end portion of this division portion to form an annular wide flare portion 26, and is inserted into the widened open end portion of the inner pipe 23a1. Insert the tip and fix it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piping structure of an air conditioner indoor unit suitable for a ceiling suspension type or the like that is hung on a ceiling or the like, and particularly to a pipe structure of an air conditioner indoor unit in which a part of the refrigerant pipe in the indoor unit is improved. Regarding the structure.

[0002]

[Prior art]

 Generally, an example of this type of ceiling-mounted air conditioner is shown in FIG. As shown in FIG. 4, the indoor unit 1 hung on the ceiling of the room has a suction grill 2 on the lower surface and an outlet grill 3 on the side surface of the indoor unit 1 as shown in FIG. The exchanger 4 and the indoor fan 5 are built in, and a partition plate 6 partitions them from each other.

The indoor heat exchanger 4 is connected to the gas pipes 7 a and the liquid pipes 7 b of the refrigerant pipe 7, respectively, and a drain tray 8 for receiving the drainage condensed on the outer surface of the indoor heat exchanger 4 is arranged below them. I have set up.

The conventional refrigerant pipe 7 is bent at its tip end from, for example, a vertical diagonal direction to a horizontal direction, penetrates the partition plate 6 and extends to the indoor fan 5 side, and the extension end part thereof has, for example, a union joint. 9 are connected, and a heat insulating material 10 is fixed to the penetrating portion and the outer circumference before and after it by a string or the like.

[0005]

[Problems to be solved by the device]

 However, in such a conventional refrigerant pipe 7, during the cooling operation of the air conditioner, a part of the drain 11 condensed on the outer surface of the liquid pipe 7b as shown in FIG. 5 is indicated by a solid arrow in the figure. In addition, there is a case where the liquid flows down the gap between the outer surface of the liquid pipe 7b and the inner peripheral surface of the heat insulating material 10 along a gradient and drops onto the suction grill 2 side, and further drops into the room below it. There is inconvenience.

Therefore, conventionally, in order to prevent such water leakage of the drain 11 to the outside of the indoor unit 1, there is a case where the trap 12 is further bent at the bent portion of the liquid pipe 7b as shown in FIG. is there.

However, in this case, most of the drain 11 of the liquid pipe 7b can be received by the drain tray 8, so that water leakage to the outside of the indoor unit 1 can be prevented, but a sufficient space for bending the trap 12 is provided. Is required, which leads to an increase in the size of the indoor unit 1.

Therefore, the present invention has been made in consideration of such circumstances, and its purpose is to provide a pipe for a small and thin air conditioner indoor unit capable of preventing drain inside the indoor unit from leaking to the outside. To provide the structure.

[0009]

[Means for Solving the Problems]

 The present invention is configured as follows to solve the above problems.

That is, the present invention comprises an indoor heat exchanger built into a casing of an indoor unit, and a refrigerant pipe connected to the indoor heat exchanger is bent from a vertical direction to a horizontal direction to penetrate the casing. A drain tray for receiving the drain of the indoor heat exchanger is arranged below the indoor heat exchanger and below the bent portion of the refrigerant pipe to the horizontal portion. In the air conditioner indoor unit, the refrigerant pipe is expanded to the outside of the casing by expanding one opening end of the horizontal portion located above the drain tray to form an annular wide flare portion. It is characterized by having an extending outer pipe and an inner pipe connected to the indoor heat exchanger and having a tip end portion connected to a diameter-expanded opening end portion of the outer pipe.

[0011]

[Action]

 Drain that has condensed on the outer surface of the refrigerant pipe in the indoor unit is blocked by the flare portion of the refrigerant pipe and grows large, and drops by its own weight into the drain tray below it.

Therefore, even when there is no trap in the refrigerant pipe in the indoor unit, it is possible to prevent the drain from leaking to the outside of the indoor unit along the outer surface of the refrigerant pipe and contaminating the surrounding area.

[0013]

【Example】

 An embodiment of the present invention will be described below.

FIG. 1 is an enlarged view of an essential part showing a partial cross section of an essential part of an embodiment when the present invention is applied to the indoor unit 1 shown in FIG. 3 and FIG. The indoor unit 21 has an indoor fan (not shown) and an indoor heat exchanger (not shown) in its casing, and a partition plate 22 partitions them from each other, and a refrigerant pipe 23 is connected to the indoor heat exchanger. ing.

The refrigerant pipe 23 is for passing a liquid refrigerant during the cooling operation of the refrigeration cycle, and one end thereof is connected to an external refrigerant pipe (not shown).

When connecting the front end portion of the refrigerant pipe 23 to the external refrigerant pipe, the indoor unit 21 is configured to be small and thin, so that the space S in the casing has the refrigerant pipe shown in FIG. There is not enough space to form the trap 11 like the liquid pipe 7b of No. 7.

Therefore, the refrigerant pipe 23 has its tip bent from the vertical direction to the horizontal direction at a substantially right angle, and the tip of the horizontal part 23a is penetrated through the partition plate 22 so as to extend slightly to the outside. For example, a union joint 24 is connected to the extended end portion to be connected to the external refrigerant pipe. A heat insulating material 25 of a required length is lagged on the penetrating portion of the refrigerant pipe 23 and the outer periphery before and after the penetrating portion.

As shown in FIG. 2, the refrigerant pipe 23 has a horizontal portion 23a at the tip end thereof slightly inward (leftward) from the inner end (left end in FIG. 1) of the heat insulating material 25. The inner pipe 23a1 divided along the direction is connected to the outer pipe 23a2 connected to the union joint 24.

That is, the outer tube 23a2 has a trumpet shape that widens toward the forward end by expanding the inner diameter of the inner open end (the left end in FIG. 2) to the required diameter by, for example, double flare processing. It is formed on the flare portion 26. The tip of the inner pipe 23 a1 of the refrigerant pipe 23 is fitted into the flare portion 26 and fixed by brazing or the like.

Below the flare portion 26 thus formed, one open end of the drain tray 28 that mainly receives the drain 27 of the indoor heat exchanger is located.

Therefore, as shown in FIG. 1, the drain 27 that has condensed on the outer bottom surface of the inner pipe 23a1 from the bent portion of the refrigerant pipe 23 is blocked by the flare portion 26 and grows large, and is drained downward by its own weight. Drip into the dish 28.

Therefore, it is possible to prevent the drain 27 from traveling along the outer bottom surface of the refrigerant pipe 23 along the gradient and leaking to the outside of the indoor unit 21, contaminating the surrounding area, and dripping into the room.

Moreover, since the flare portion 26 is expanded in a trumpet shape toward the inner pipe 23a1 of the refrigerant pipe 23, the inner pipe 23a1 of the refrigerant pipe 23 is easily fitted into the outer pipe 23a2 to be brazed. It is possible to improve the fixing workability.

Further, since it is not necessary to provide a trap in the refrigerant pipe 23, the trap forming operation can be omitted and the assembling workability of the refrigerant pipe 23 can be improved, and the indoor unit 21 can be made thin and compact. Can be achieved.

1 and 2, the case where the bent portion of the refrigerant pipe 23 is bent at a substantially right angle has been described, but the present invention is not limited to that bending angle, and it is not a right angle. It can also be applied when bent at a small angle.

[0026]

[Effect of device]

 As described above, according to the present invention, since the flare portion which is convex outward is provided on the outer surface of the refrigerant pipe in the indoor unit, the drained dew on the outer surface of the refrigerant pipe is blocked by the flare portion, and It can be dropped on the drain dish below it.

For this reason, it is possible to prevent the drain that has condensed on the outer surface of the refrigerant pipe in the indoor unit from being transmitted to the outer surface of the refrigerant pipe and leaking to the outside to contaminate the surrounding area.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a piping structure of an air conditioner indoor unit according to the present invention.

FIG. 2 is a front view of relevant parts showing a state in which the refrigerant pipe shown in FIG. 1 is divided.

FIG. 3 is a partially cutaway perspective view of a general ceiling-mounted indoor unit.

FIG. 4 is a side view showing a vertical cross-section of a part of the indoor unit shown in FIG.

FIG. 5 is a partially enlarged view of a conventional example.

FIG. 6 is a partially enlarged view of another conventional example.

[Explanation of symbols]

 21 Indoor Unit 22 Partition Plate 23 Refrigerant Pipe 23a1 Inner Pipe 23a2 Outer Pipe 24 Union Joint 25 Insulation 26 Flare 27 Drain 28 Drain Dish

Claims (1)

[Scope of utility model registration request] 1. An indoor heat exchanger provided inside a casing of an indoor unit, wherein a refrigerant pipe connected to the indoor heat exchanger is bent from a vertical direction to a horizontal direction so that the casing penetrates the exterior. In an air conditioner indoor unit in which a drain tray for receiving the drain of the indoor heat exchanger is provided below the indoor heat exchanger and below the bent portion of the refrigerant pipe to a horizontal portion. The refrigerant pipe is an outer pipe extending to the outside of the casing by forming a flared portion with an annular wide end by expanding one opening end portion in the horizontal portion located above the drain dish. And an inner pipe connected to the indoor heat exchanger and having a tip portion connected to the enlarged diameter opening end portion of the outer pipe.