JP7214015B2 - Silencer for air conditioner and air conditioner - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to an air conditioner silencer and an air conditioner.

A silencer is provided in a refrigerant circuit of an air conditioner to suppress noise caused by pressure fluctuations of the refrigerant. The muffler has a configuration in which tip portions of a pair of pipes protrude inside a muffler main body formed of a container so as to face each other. A small amount of refrigerating machine oil flows into the silencer together with the refrigerant from the compressor. Refrigerant oil may stay in the space between the pipes protruding from the As a result, the amount of refrigerating machine oil returned from the muffler to the compressor decreases, possibly causing poor lubrication of the compressor.

In order to eliminate the stagnation of refrigerating machine oil in the silencer, for example, in the silencer of Patent Document 1, a through-hole for returning oil is provided in a pipe projecting upward with respect to the inside of the silencer main body. Since the upward-protruding pipe has a through-hole for oil return, even if the refrigerating machine oil stays in the space between the silencer body and the upward-protruding pipe, the upward-protruding pipe from the through-hole Refrigerant oil can be returned to the muffler, and as a result, retention of refrigerating machine oil in the silencer can be suppressed. Further, Patent Literature 2 discloses a muffler in which the ends of a pair of pipes are arranged facing each other inside a muffler body. One of the pipes is provided with a suction nozzle pipe connected to the bottom of the muffler body with a small gap, and the refrigerating machine oil remaining at the bottom of the muffler body can be sucked from the nozzle pipe.

JP 2018-162690 A Microfilm of Japanese Utility Model Application No. 58-14703 (Japanese Utility Model Application No. 59-120879)

In the air conditioner, the refrigerant in the pipes flows in opposite directions during the cooling operation and during the heating operation. Therefore, even in the silencer of Patent Document 1, the refrigerant flows upward during either the cooling operation or the heating operation. Air conditioners are designed so that the flow velocity of the refrigerant flowing from bottom to top in vertical pipes is greater than the zero penetration speed, which is the critical speed at which oil adhering to the inner walls of vertical pipes rises. Since the inner diameter of the pipe is larger than that of the vertical pipe, the flow velocity of the refrigerant flowing from the bottom to the top of the muffler body may be less than the zero penetration velocity. In this case, when the refrigerating machine oil is discharged upward together with the refrigerant from the pipe projecting upward with respect to the muffler main body, the refrigerating machine oil returns from the muffler main body to the through hole and is released again from the pipe projecting upward. . Therefore, in the silencer of Patent Document 1, depending on the flow velocity of the refrigerant in the silencer, the refrigerating machine oil circulates in the silencer during either the cooling operation or the heating operation, preventing the refrigeration oil from staying in the silencer. The problem is that it cannot be suppressed. In addition, in the silencer of Patent Document 2, since the nozzle pipe for suction is provided only in one pipe, depending on the flow direction of the refrigerant, the refrigerating machine oil staying at the bottom of the silencer main body is sucked from the other pipe. However, there is a problem that the refrigerating machine oil cannot be prevented from remaining in the silencer.

The present disclosure has been made based on this background, and is an air conditioner that can suppress the retention of refrigerating machine oil regardless of the flow velocity of the refrigerant in the silencer during both cooling operation and heating operation. The purpose is to provide a silencer and an air conditioner.

In order to achieve the above object, an air conditioner silencer according to the present disclosure includes:
a container capable of storing refrigerating machine oil inside;
A first tip penetrating the wall surface of the container and having an opening formed therein is disposed inside the container , and a first through hole is formed in the container below the first tip. a first pipe that is
A second tip portion having an opening penetrating the wall surface of the container at a position different from the first pipe is arranged in the container, and the second tip portion is located in the container and is closer to the second tip portion than the second tip portion. a second pipe having a second through hole formed below;
with
The first through-hole and the second through-hole are formed in the pipe walls of the first pipe and the second pipe, respectively .

According to the present disclosure, it is possible to provide an air conditioner silencer and an air conditioner that can suppress refrigerating machine oil retention regardless of the flow velocity of the refrigerant in the silencer during both cooling operation and heating operation.

Schematic diagram showing a refrigerant circuit of an air conditioner according to Embodiment 1 1 is a vertical cross-sectional view showing the configuration of a silencer according to Embodiment 1 A vertical cross-sectional view showing the configuration of a silencer according to Embodiment 2 Cross-sectional view of the muffler of Figure 3 cut along the IV-IV line A vertical cross-sectional view showing the structure of a silencer according to Embodiment 3 Longitudinal sectional view showing the configuration of a silencer according to a modification Longitudinal sectional view showing another configuration of the silencer according to the modified example Longitudinal sectional view showing another configuration of the silencer according to the modified example

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an air conditioner silencer and an air conditioner will be described in detail with reference to the drawings. In each drawing, the same code|symbol is attached|subjected to the same or equivalent part. In each embodiment, the longitudinal direction of the muffler is the X axis, the direction on the same horizontal plane as the X axis and perpendicular to the X axis is the Y axis, and the direction perpendicular to the X and Y axes is used as the Z-axis.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a refrigerant circuit of an air conditioner 1 according to Embodiment 1. FIG. The air conditioner 1 includes a silencer 10 that suppresses noise of the air conditioner 1, a compressor 20 that is connected to the silencer 10 and discharges the compressed refrigerant to the outside, and a compressor that is connected to the compressor 20. A four-way switching valve 30 that switches the supply destination of the refrigerant from 20, an outdoor heat exchanger 40 that is connected to the four-way switching valve 30 and exchanges heat with outdoor air, and an outdoor heat exchanger 40 An expansion valve 50 for decompressing a high-pressure liquid refrigerant, and an indoor heat exchanger 60 connected to the expansion valve 50 for exchanging heat with indoor air. Each part of the air conditioner 1 is connected via refrigerant pipes.

The muffler 10 suppresses noise of the air conditioner 1 by suppressing pressure fluctuations of the refrigerant flowing through the refrigerant pipe. The main cause of the noise in the air conditioner 1 is that the pressure fluctuation of the refrigerant is transmitted to the indoor heat exchanger 60 to cause resonance. It is connected to the.

The compressor 20 is, for example, a pump, and compresses the sucked refrigerant to discharge high-temperature and high-pressure refrigerant to the outside. Compressor 20 is connected to four-way switching valve 30 via a refrigerant pipe.

The four-way switching valve 30 is a valve that selectively switches between the outdoor heat exchanger 40 and the indoor heat exchanger 60 to which the high-temperature, high-pressure refrigerant from the compressor 20 is supplied. During cooling operation, the four-way switching valve 30 connects the discharge side of the compressor 20 and the outdoor heat exchanger 40, as indicated by the solid line in FIG. to connect. On the other hand, during heating operation, the four-way switching valve 30 connects the discharge side of the compressor 20 and the silencer 10, as indicated by the dotted line in FIG. 40 is connected.

The outdoor heat exchanger 40 is installed outdoors and exchanges heat with outdoor air. The outdoor heat exchanger 40 acts as a condenser during cooling operation and acts as an evaporator during heating operation.

The expansion valve 50 is arranged between the outdoor heat exchanger 40 and the indoor heat exchanger 60 and reduces the pressure of the high-pressure liquid refrigerant condensed in the outdoor heat exchanger 40 or the indoor heat exchanger 60 .

The indoor heat exchanger 60 is installed indoors and exchanges heat with the indoor air. The indoor heat exchanger 60 acts as an evaporator during cooling operation and acts as a condenser during heating operation.

During cooling operation, the high-temperature, high-pressure refrigerant discharged from the compressor 20 is supplied to the outdoor heat exchanger 40 via the four-way switching valve 30, and the outdoor heat exchanger 40 converts the high-temperature, high-pressure refrigerant to the outdoor air. and condense the high-temperature and high-pressure refrigerant. The high-pressure refrigerant condensed in the outdoor heat exchanger 40 is depressurized by the expansion valve 50 and then supplied to the indoor heat exchanger 60 . The indoor heat exchanger 60 absorbs heat from the indoor air into the low-temperature, low-pressure refrigerant to evaporate the refrigerant. The refrigerant evaporated in the indoor heat exchanger 60 flows through the muffler 10 in the direction indicated by the solid arrow in FIG.

On the other hand, during heating operation, the high-temperature, high-pressure refrigerant discharged from the compressor 20 is supplied to the muffler 10 via the four-way switching valve 30, and flows through the muffler 10 in the direction indicated by the dashed arrow in FIG. After that, it is supplied to the indoor heat exchanger 60 . The indoor heat exchanger 60 radiates heat from the high-temperature, high-pressure refrigerant to the indoor air, and condenses the high-temperature, high-pressure refrigerant. The high-pressure refrigerant condensed in the indoor heat exchanger 60 is depressurized by the expansion valve 50 and then supplied to the outdoor heat exchanger 40 . The outdoor heat exchanger 40 absorbs heat from outdoor air into a low-temperature, low-pressure refrigerant to evaporate the refrigerant. The refrigerant evaporated in the outdoor heat exchanger 40 is delivered to the suction side of the compressor 20 via the four-way switching valve 30 .

As described above, in the muffler 10, the refrigerant flows from the indoor heat exchanger 60 toward the four-way switching valve 30 during cooling operation, while the refrigerant flows from the four-way switching valve 30 during heating operation. The refrigerant flows toward the indoor heat exchanger 60 side.

FIG. 2 is a cross-sectional view showing the configuration of the muffler 10 according to Embodiment 1. FIG. The muffler 10 includes a container 11 capable of storing refrigerating machine oil in the bottom portion, a first pipe 12 passing through the bottom portion of the container 11 and fixed to the bottom portion of the container 11, and a first and a second pipe 13 that passes through the bottom surface of the container 11 at a position spaced from the pipe 12 and is fixed to the bottom surface of the container 11 . The proximal end of the first pipe 12 is connected to the indoor heat exchanger 60 via the refrigerant pipe, and the proximal end of the second pipe 13 is connected to the four-way switching valve 30 via the refrigerant pipe. there is One of the first pipe 12 and the second pipe 13 supplies the refrigerant into the container 11, and the other pipe discharges the refrigerant whose pressure fluctuation is reduced by the container 11 to the outside.

The container 11 includes a main body portion 11a having an internal space and a pair of end portions 11b provided on both sides of the main body portion 11a. The body portion 11a has a cylindrical shape, and the pair of end portions 11b each have a hemispherical shape in order to resist the pressure of the gas refrigerant. The container 11 is arranged inside the air conditioner 1 so that the axial direction of the cylindrical body portion 11a is oriented horizontally.

The first pipe 12 is a cylindrical pipe having a constant inner diameter in the longitudinal direction, and is formed in an L shape as a whole. The first pipe 12 includes a distal end portion 12a provided on the distal end side, a bent portion 12b connected to the distal end portion 12a, a base end portion 12c connected to the bent portion 12b, and a base end portion 12c. and a through hole 12d. The tip portion 12a is an example of a first tip portion, and the through hole 12d is an example of a first through hole.

The distal end portion 12 a has an opening through which gas refrigerant can be discharged or sucked, is arranged inside the container 11 , and extends in the longitudinal direction of the container 11 . The tip portion 12a is arranged, for example, on the central axis extending in the longitudinal direction of the cylindrical body portion 11a. The bent portion 12b is provided on the proximal end side of the distal end portion 12a and connects the distal end portion 12a and the proximal end portion 12c extending in mutually different directions. The base end portion 12 c extends in a direction perpendicular to the longitudinal direction of the container 11 and vertically penetrates the bottom portion of the container 11 .

The through hole 12 d is a hole for sucking into the first pipe 12 the refrigerating machine oil discharged from the second pipe 13 into the container 11 . The through hole 12d is, for example, a circular hole. 12 d of through-holes are provided in the base end part 12c, and are formed in the inside of the container 11 below the front-end|tip part 12a. Since the refrigerating machine oil L below the through-hole 12d stays on the bottom surface of the container 11, it is preferable to form the through-hole 12d at the bottom of the container 11 as much as possible.

The second pipe 13 is a circular pipe having the same inner diameter as the first pipe 12 and having a constant inner diameter in the longitudinal direction, and is formed in an L shape. The second pipe 13 includes a tip portion 13a provided on the tip side, a bend portion 13b connected to the tip portion 13a, a base end portion 13c connected to the bend portion 13b, and a base end portion 13c. and a through hole 13d. The tip portion 13a is an example of a second tip portion, and the through hole 13d is an example of a second through hole.

The second pipe 13 has the same or an equivalent configuration as that of the first pipe 12, and is fixed to the container 11 so that the tip portion 13a faces the tip portion 12a. Each part of the second pipe 13 has the same or equivalent configuration as each part of the first pipe 12 .

Next, with reference to FIG. 2, the flow of refrigerant and refrigerating machine oil L during operation of the air conditioner 1 will be described. 2 indicates the flow of the refrigerant during the cooling operation, and the solid arrow indicated in FIG. 2 indicates the flow of the refrigerating machine oil L.

The gas refrigerant evaporated in the indoor heat exchanger 60 flows into the first pipe 12 of the silencer 10 along with the refrigerating machine oil L. Both the gas refrigerant and the refrigerating machine oil L that have ascended the first pipe 12 are discharged into the container 11 from the tip portion 12a and the through hole 12d. The gas refrigerant discharged from the through hole 12 d and the tip portion 12 a into the container 11 flows into the second pipe 13 from the tip portion 13 a and is delivered to the four-way switching valve 30 .

On the other hand, part of the refrigerating machine oil L discharged into the container 11 from the through hole 12d and the tip portion 12a is carried by the flow of the refrigerant gas and flows into the second pipe 13 from the tip portion 13a, and the rest is carried by the force of gravity. It falls to the bottom part of the container 11 by action. The refrigerating machine oil L that has fallen to the bottom surface of the container 11 is sucked into the second pipe 13 through the through hole 13d because the inside of the second pipe 13 is at a low pressure due to the operation of the compressor 20, and the gas refrigerant is released. It is delivered to the four-way switching valve 30 along the flow.

Even during heating operation, the gas refrigerant discharged from the through hole 13 d and the tip portion 13 a into the container 11 flows into the first pipe 12 from the tip portion 12 a and is delivered to the indoor heat exchanger 60 . On the other hand, part of the refrigerating machine oil L discharged into the container 11 from the through-hole 13d and the tip portion 13a is carried by the flow of the refrigerant gas and flows into the first pipe 12 from the tip portion 12a, and the rest is carried by the force of gravity. It falls to the bottom part of the container 11 by action. Since the inside of the first pipe 12 has a low pressure due to the operation of the compressor 20, the refrigerating machine oil L that has fallen to the bottom surface of the container 11 is sucked into the first pipe 12 through the through hole 12d, and the gas refrigerant is released. It is delivered to the indoor heat exchanger 60 along the flow.

As described above, the muffler 10 according to Embodiment 1 includes the first pipe 12 in which the through hole 12d is formed below the tip portion 12a in the container 11, and the and a second pipe 13 in which a through hole 13d is formed below the tip portion 13a. Therefore, the refrigerating machine oil L that has fallen on the bottom surface of the silencer 10 can be sucked downstream of the gas refrigerant both during the cooling operation and during the heating operation, and as a result, retention of the refrigerating machine oil L in the silencer 10 can be suppressed. .

The air conditioner 1 according to Embodiment 1 includes the silencer 10 having the above configuration. Therefore, the refrigerating machine oil L that has flowed into the silencer 10 from the compressor 20 can be returned to the compressor 20 during both the cooling operation and the heating operation, and as a result, poor lubrication of the compressor 20 can be prevented.

(Embodiment 2)
Next, a silencer 10 according to Embodiment 2 will be described with reference to FIGS. 3 and 4. FIG. Although the through holes 12d and 13d are formed in the same direction in the first embodiment, the through holes 12d and 13d are formed to face each other in the second embodiment. Since the basic configuration of the muffler 10 according to the second embodiment is the same as that of the muffler 10 according to the first embodiment, different parts between the two will be mainly described below.

FIG. 3 is a vertical cross-sectional view showing the structure of a silencer 10 according to Embodiment 2, and FIG. 4 is a cross-sectional view of the silencer 10 of FIG. 3 taken along line IV-IV. 12 d of through-holes are formed in the base end part 12c of the 1st piping 12 so that it may face the 2nd piping 13 side. On the other hand, the through hole 13d is formed in the base end portion 13c of the second pipe 13 so as to face the first pipe 12 side.

Since the muffler 10 has the above configuration, when the gas refrigerant and the refrigeration oil L flow from the first pipe 12 to the second pipe 13, part of the refrigeration oil L flowing through the first pipe 12 is It is discharged in the +X direction from the through-hole 12d into the container 11, continues toward the through-hole 13d, and flows into the second pipe 13 from the through-hole 13d. On the other hand, even when the gas refrigerant and the refrigeration oil L flow from the second pipe 13 to the first pipe 12, part of the refrigeration oil L that has flowed through the second pipe 13 similarly flows through the through hole 13d. It flows smoothly toward the through hole 12d.

As described above, the muffler 10 according to the second embodiment includes a pair of through holes 12d and 13d arranged to face each other inside the container 11. As shown in FIG. Therefore, the refrigerating machine oil L discharged from one of the through-holes 12d and 13d smoothly flows toward the other of the through-holes 12d and 13d.

(Embodiment 3)
Next, a muffler 10 according to Embodiment 3 will be described with reference to FIG. In Embodiments 1 and 2, base ends 12c and 13c penetrate the flat portion of the bottom surface of container 11, but in Embodiment 3, base ends 12c and 13c extend from the bottom surface of container 11. Through holes 12 d and 13 d are arranged below the bottom surface of the container 11 , penetrating through the projecting portion 11 c projecting downward. Since the basic configuration of the muffler 10 according to Embodiment 3 is the same as that of the mufflers 10 according to Embodiments 1 and 2, different parts between the two will be mainly described below.

FIG. 5 is a longitudinal sectional view showing the structure of the muffler 10 according to Embodiment 3. As shown in FIG. The container 11 is provided with a pair of projecting portions 11c which are provided at positions apart from each other on the bottom surface and project downward from the bottom surface. The projecting portion 11c has, for example, a truncated cone shape that tapers downward. A base end portion 12c of the first pipe 12 and a base end portion 13c of the second pipe 13 are fixed to the container 11 so as to pass through the pair of protrusions 11c. The through holes 12 d and 13 d are both formed inside the container 11 and below the bottom surface of the container 11 . Since the through holes 12d and 13d are provided inside the projecting portion 11c, the volume in which the refrigerating machine oil L stays can be reduced, and the refrigerating machine oil L staying in the silencer 10 can be further reduced.

Since the muffler 10 has the above configuration, when the gas refrigerant and the refrigeration oil L flow from the first pipe 12 to the second pipe 13, the refrigeration oil L flowing through the first pipe 12 is and through the through hole 12 d into the container 11 , and part of it falls due to the action of gravity and reaches the bottom surface of the container 11 . Since the container 11 is formed with a projecting portion 11c that projects downward from the bottom surface of the container 11, the refrigerating machine oil L that has reached the bottom surface of the container 11 moves toward the projecting portion 11c due to the action of gravity and penetrates the bottom surface of the container 11. The air is sucked into the second pipe 13 through the hole 13d.

On the other hand, when the gas refrigerant and the refrigeration oil L flow from the second pipe 13 to the first pipe 12, part of the refrigeration oil L that has flowed through the second pipe 13 is similarly arranged inside the projecting portion 11c. It is sucked into the first pipe 12 from the through hole 12d.

As described above, the muffler 10 according to Embodiment 3 is provided at a portion where the first pipe 12 and the second pipe 13 penetrate the bottom surface of the container 11, A pair of projecting portions 11 c projecting downward and a pair of through holes 12 d and 13 d formed below the bottom surface of the container 11 are provided. Therefore, the volume of the space in which the refrigerating machine oil L stays can be reduced, and moreover, the refrigerating machine oil L that has fallen to the bottom surface of the container 11 flows toward the projecting portion 11c. can be suppressed further.

The present disclosure is not limited to this, and modifications described below are also possible.

(Modification)
In the above-described embodiment, the first pipe 12 and the second pipe 13 are both circular pipes having the same inner diameter, but are not limited to this. For example, the inner diameter of the first pipe 12 may be larger than the inner diameter of the second pipe 13 or smaller than the inner diameter of the second pipe 13 .

In the above embodiment, the distal end portion 12a, the bent portion 12b and the proximal end portion 12c of the first pipe 12, and the distal end portion 13a, the bent portion 13b and the proximal end portion 13c of the second pipe 13 all have the same inner diameter. but not limited to this. For example, the inner diameters of the distal end portions 12a, 13a may be smaller than the inner diameters of the curved portions 12b, 13b and the proximal end portions 12c, 13c.

In the above-described embodiment, both the tip portions 12a and 13a are arranged on the central axis of the main body portion of the container 11, but this is not the only option. The positions of the tip portions 12a and 13a in the container 11 are arbitrary. For example, they may be provided above or below the central axis in the container 11.

In the above-described embodiment, base ends 12c and 13c extend in a direction perpendicular to the longitudinal direction of container 11, in other words, in a direction perpendicular to the bottom surface of container 11, but this is not the only option. The base ends 12c and 13c may extend in any direction as long as the refrigerant gas can be supplied into the container 11. For example, the base ends 12c and 13c may extend obliquely with respect to the bottom surface of the container 11.

Although the through holes 12d and 13d are circular in the above embodiment, the shape is not limited to this. The through-holes 12d and 13d may have any shape as long as they can suck the refrigerator oil, and may have, for example, a slit shape, an elliptical shape, or a rectangular shape. Also, the opening areas of the through holes 12d and 13d may be different. For example, when the through holes 12d and 13d are circular, the respective diameters may be different.

Although the through-holes 12d and 13d are formed at the same height with respect to the bottom surface of the container 11 in the above-described embodiment, the present invention is not limited to this. 12 d of through-holes may be formed in a position higher than 13 d of through-holes, and may be formed in a position lower than 13 d of through-holes.

In the above-described embodiment, the base ends 12c and 13c are provided with the through-holes 12d and 13d one by one, but the present invention is not limited to this. A plurality of through holes 12d and 13d may be provided in the base ends 12c and 13c, respectively. When a plurality of through holes 12d and 13d are provided, the through holes 12d and 13d may be arranged at regular intervals in the circumferential direction of the base ends 12c and 13c.

Although the container 11 has a cylindrical shape in the above embodiment, it is not limited to this. The container 11 may have any shape as long as it can suppress noise caused by pressure fluctuations of the gas refrigerant and retain the refrigerating machine oil inside. The container 11 may be, for example, spherical, box-shaped, or cylindrical with an elliptical cross-section.

Although the protruding portion 11c has a truncated cone shape in the third embodiment, it is not limited thereto. The projecting portion 11c may have any shape as long as it can collect the refrigerating machine oil that has reached the bottom surface of the container 11. For example, the projecting portion 11c may have a polygonal pyramid shape or a cylindrical shape.

Although both the first pipe 12 and the second pipe 13 are L-shaped in the above-described embodiment, the present invention is not limited to this. For example, as shown in FIG. 6, the bend 13b of the second pipe 13 extends so as to protrude toward the adjacent end 11b of the container 11, then bends in the opposite direction, and then the container 11 is bent. It may be formed so as to extend in a direction perpendicular to the bottom surface. Also, the first pipe 12 may be formed in the same or equivalent shape as the second pipe 13 in FIG.

In the above embodiment, the center axes of the tip portions 12a and 13a both extend in the horizontal direction, but this is not the only option. For example, as shown in FIG. 7, the central axes of the tip portions 12a and 13a may be tilted upward so as to gradually separate from the bottom portion of the container 11 as they go from the base end side to the tip end side. According to the above configuration, for example, the oil droplet emitted from the tip 12a has a vertically upward velocity component, so it falls in a parabola and is caught by the tip 13a arranged upward. Therefore, it is possible to prevent some of the droplets discharged from the tip portion 12a from falling on the bottom surface portion of the container 11, thereby further suppressing stagnation of the refrigerating machine oil in the silencer 10. FIG.

In the above embodiment, the base ends 12c and 13c penetrate the bottom surface of the main body 11a of the container 11, but the present invention is not limited to this. For example, as shown in FIG. 8, the base end portion 13c may pass through one end portion 11b of the container 11 . At this time, the base end portion 13c may extend obliquely with respect to the bottom portion of the main body portion 11a. Also, the other end portion 11b may be passed through the base end portion 12c in the same manner as the base end portion 13c in FIG.

It should be noted that the present disclosure is capable of various embodiments and modifications without departing from its broader spirit and scope. Moreover, the embodiments described above are for explaining the present disclosure, and do not limit the scope of the present disclosure. In other words, the scope of the present disclosure is indicated by the claims rather than the embodiments. Various modifications made within the scope of the claims and within the scope of equivalent disclosure are considered to be within the scope of the present disclosure.

This application is based on Japanese Patent Application No. 2020-11355 filed on January 28, 2020 and includes the specification, claims, drawings and abstract thereof. The disclosure in the above Japanese patent application is incorporated herein by reference in its entirety.

INDUSTRIAL APPLICABILITY The muffler for an air conditioner and the air conditioner of the present invention are useful because they can suppress stagnation of refrigerating machine oil regardless of the flow velocity of the refrigerant in the muffler during both cooling operation and heating operation.

DESCRIPTION OF SYMBOLS 1... Air conditioner, 10... Silencer, 20... Compressor, 30... Four-way switching valve, 40... Outdoor heat exchanger, 50... Expansion valve, 60... Indoor heat exchanger, 11... Container, 11a... Main body Part 11b end 11c projecting portion 12 first pipe 12a, 13a distal end 12b, 13b curved portion 12c, 13c base end 12d, 13d through hole 13 Second pipe, L...Refrigerant oil

Claims (7)

a container capable of storing refrigerating machine oil inside;
A first tip penetrating the wall surface of the container and having an opening formed therein is disposed inside the container , and a first through hole is formed in the container below the first tip. a first pipe that is
A second tip portion having an opening penetrating the wall surface of the container at a position different from the first pipe is arranged in the container, and the second tip portion is located in the container and is closer to the second tip portion than the second tip portion. a second pipe having a second through hole formed below;
with
The first through-hole and the second through-hole are formed in the pipe walls of the first pipe and the second pipe, respectively,
Silencer for air conditioner. Both the first pipe and the second pipe are formed in an L shape so as to be bent within the container ,
The first tip and the second tip are arranged to face each other,
The muffler for an air conditioner according to claim 1. The first through-hole and the second through-hole are formed to face each other within the container,
The muffler for an air conditioner according to claim 1 or 2. Both the first pipe and the second pipe are fixed to the container while penetrating through the bottom surface of the container,
The muffler for an air conditioner according to any one of claims 1 to 3. The container includes a pair of protrusions provided at a portion through which the first pipe and the second pipe penetrate and protruding downward from the bottom surface,
The first through-hole and the second through-hole are formed below the bottom surface,
The muffler for an air conditioner according to claim 4. The first tip portion and the second tip portion are both gradually separated from the bottom portion of the container as they go from the base end side to the tip side, and from the first tip portion and the second tip portion upwardly tilted such that the ejected oil droplets both have horizontal and vertical upward velocity components ;
The muffler for an air conditioner according to any one of claims 1 to 5. a compressor that repeatedly sucks, compresses, and discharges refrigerant;
an indoor heat exchanger that is connected to the compressor via a refrigerant pipe and exchanges heat between the refrigerant and indoor air;
The air conditioner silencer according to any one of claims 1 to 6, which is disposed between the compressor and the indoor heat exchanger and suppresses noise caused by pressure fluctuations of refrigerant;
air conditioner.

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