CN115218569A

CN115218569A - Liquid storage device for compressor and compressor provided with same

Info

Publication number: CN115218569A
Application number: CN202210125305.XA
Authority: CN
Inventors: 金度亨; 张淇晥
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2021-04-20
Filing date: 2022-02-10
Publication date: 2022-10-21
Anticipated expiration: 2042-02-10
Also published as: EP4080140A1; KR20230030613A; KR20220144675A; KR102591416B1; CN115218569B; US20220333601A1

Abstract

The accumulator for a compressor according to the present invention includes: a casing disposed outside a casing of the compressor and having a refrigerant accommodating space; a refrigerant connection pipe having one end communicating with an outlet side of the evaporator and the other end communicating with the refrigerant accommodating space of the casing; and refrigerant suction pipes, one end of which communicates with the refrigerant accommodating space of the casing and the other end of which communicates with a suction side of the compressor, the refrigerant suction pipes being respectively fixed to a bottom surface and a top surface of the casing for forming the refrigerant accommodating space. Thus, the refrigerant suction pipe is fixed to the casing of the accumulator without providing an additional pipe holder, so that the vibration of the accumulator can be reduced while the manufacturing cost can be reduced.

Description

Liquid storage device for compressor and compressor provided with same

Technical Field

The present invention relates to a liquid reservoir for a compressor and a compressor in which the liquid reservoir is provided outside a casing.

Background

Generally, compressors may be classified into a low pressure type compressor and a high pressure type compressor according to a refrigerant connection relationship between a refrigerant suction pipe and a compression part. The low pressure type compressor is a type in which a refrigerant suction pipe communicates with an inner space of the casing and is indirectly connected to the compression part, and the high pressure type compressor is a type in which a refrigerant suction pipe penetrates the casing and is directly connected to the compression part.

In the low pressure type compressor, as the refrigerant passing through the refrigerant suction pipe passes through the inner space of the casing, the liquid refrigerant and the gas refrigerant may be separated in the inner space of the casing. Thus, the low-pressure compressor may be provided without an additional accumulator (accumulator) on the upstream side of the compression portion.

In the high pressure type compressor, since the refrigerant passing through the refrigerant suction pipe is directly supplied to the compression part, the liquid refrigerant may flow into the compression part together with the gas refrigerant. Thus, in the high-pressure compressor, the inflow of the liquid refrigerant into the compression portion is suppressed by providing an additional accumulator on the upstream side of the compression portion.

In general, an accumulator is eccentrically disposed at one side of a compressor, is provided with a refrigerant connection pipe at an upper end constituting an inlet and is connected to an outlet of an evaporator through a refrigerant pipe, and is provided with a refrigerant flow passage pipe at a lower end constituting an outlet and is fixed to the compressor through a refrigerant suction pipe. Further, the middle of the accumulator is fixed to the compressor by a fixing bracket surrounding the accumulator.

Such an accumulator may be formed such that the refrigerant connection pipe and the refrigerant flow path pipe are located on the same axis. However, in the case where the refrigerant connection pipe and the refrigerant flow path pipe are located on the same axis, the gas refrigerant and the liquid refrigerant passing through the refrigerant connection pipe may flow into the refrigerant flow path pipe in a state of not being sufficiently separated.

Patent document 1 (japanese laid-open patent No. S61-197968) discloses an example in which a refrigerant connection pipe and a refrigerant flow path pipe are located on the same axis, and a partition plate is provided between the refrigerant connection pipe and the refrigerant flow path pipe. This can shut off direct flow of the liquid refrigerant into the refrigerant flow path pipe, but the partition plate may be damaged due to vibration of the compressor, and thus it may be difficult to expect a long-term effect.

Patent document 2 (japanese laid-open patent No. 2013-119817) discloses an example in which an inlet of a refrigerant passage pipe is bent so as not to face a refrigerant connection pipe. In patent document 2, a refrigerant flow passage pipe is welded and fixed to a main body of an accumulator. This can cut off direct flow of the liquid refrigerant into the refrigerant flow passage pipe, and the refrigerant flow passage pipe is fixed to the main body of the accumulator, so that vibration of the refrigerant flow passage pipe can be cancelled. However, in patent document 2, since the outer peripheral surface side of the refrigerant flow path pipe is welded to the inner peripheral surface of the accumulator, the welding area is limited, and the refrigerant flow path pipe may be detached from the accumulator to increase vibration and noise.

Patent document 3 (japanese laid-open patent No. 2011-169183) discloses an example in which a refrigerant passage pipe and a refrigerant connection pipe are disposed on the same axis with a predetermined interval therebetween, and a filter mesh is provided between the refrigerant passage pipe and the refrigerant connection pipe. This can suppress the refrigerant passing through the refrigerant connection pipe from being separated into the gas refrigerant and the liquid refrigerant by the filter mesh, and the liquid refrigerant flows into the refrigerant flow path pipe.

In addition, patent document 3 discloses an example in which a refrigerant passage pipe is fixed to a main body of an accumulator by an additional pipe holder. This can suppress vibration and noise by fixing the refrigerant flow path pipe by the pipe holder, but since an additional pipe holder is added, there is a possibility that the manufacturing cost is increased.

In patent documents 1 to 3, since each refrigerant connection pipe is located on the axis of the accumulator, it is away from the axis of the compressor, and the vibration transmitted from the compressor is increased, so that the vibration of the entire compressor including the accumulator may be increased.

In addition, in patent documents 1 to 3, since the refrigerant passage pipe and the refrigerant connection pipe are arranged on the same axis or the refrigerant passage pipe is arranged lower than the refrigerant connection pipe, there is a high possibility that the liquid refrigerant flows into the compressor. For this reason, in these patent documents, a filter screen or a filter screen member similar thereto for separating liquid refrigerant in refrigerant passing through the refrigerant connection pipe may be required. Furthermore, the refrigerant flowing into the refrigerant accommodating space of the accumulator from the refrigerant connection pipe is rapidly sucked into the adjacent refrigerant flow path pipe from the refrigerant connection pipe, so that noise of the compressor including the accumulator may be increased.

Disclosure of Invention

The invention aims to provide an accumulator for a compressor and a compressor with the same, wherein the accumulator can reduce vibration and noise of the accumulator connected with one side of a compressor shell.

Another object of the present invention is to provide an accumulator for a compressor capable of stably fixing a pipe inserted into an accumulator refrigerant accommodating space even if a pipe holder is removed, and a compressor including the same.

Another object of the present invention is to provide an accumulator for a compressor and a compressor including the same, in which noise of a refrigerant that moves from an evaporator to a compressor through the accumulator can be attenuated in the accumulator.

Another object of the present invention is to provide an accumulator for a compressor capable of effectively separating liquid refrigerant from refrigerant passing through the accumulator, and a compressor including the same.

Another object of the present invention is to provide an accumulator for a compressor capable of delaying a flow rate of a refrigerant passing through the accumulator, and a compressor including the same.

Another object of the present invention is to provide an accumulator for a compressor and a compressor including the same, in which a refrigerant passing through the accumulator flows spirally in a refrigerant accommodating space of the accumulator, thereby improving a separation effect of a liquid refrigerant.

In order to achieve the object of the present invention, there may be provided an accumulator for a compressor including a casing, a refrigerant connection pipe, and a refrigerant suction pipe. The housing may be disposed outside a casing of the compressor, and may have a refrigerant accommodating space. One end of the refrigerant connection pipe may extend to the outside of the refrigerant housing space, and the other end may communicate with the refrigerant housing space. One end of the refrigerant suction pipe may communicate with the refrigerant accommodating space of the shell, and the other end may communicate with a suction side of the compressor. The refrigerant suction pipes may be fixed to a bottom surface and a top surface of the case, respectively, for forming the refrigerant accommodation space. Thus, the refrigerant suction pipe is fixed to the casing of the accumulator without an additional pipe holder, so that the vibration of the accumulator can be reduced while the manufacturing cost can be reduced.

For example, a pipe fixing portion may be formed on a top surface of the case to insert and fix one end of the refrigerant suction pipe. This enables the upper end of the refrigerant suction pipe to be firmly fixed.

As another example, the pipe fixing portion may be recessed in a direction away from the refrigerant housing space along a longitudinal direction of the casing, so that one end of the refrigerant suction pipe may be inserted into the pipe fixing portion. This enables the refrigerant suction pipe to be easily welded and joined to the housing.

As another example, the pipe fixing portion may be inserted into one end of the refrigerant suction pipe while protruding toward the refrigerant accommodating space along a longitudinal direction of the housing. Thus, the refrigerant suction pipe can be stably fixed by forming the pipe fixing portion long.

As another example, the pipe fixing portion may be formed as a pipe hole penetrating along a longitudinal direction of the casing so that the refrigerant suction pipe penetrates the casing and is fixed. This can improve the degree of freedom in manufacturing and assembling the plurality of members forming the housing.

As another example, the pipe fixing portion may be formed on an axial line of the housing. This can minimize the amount of vibration transmitted from the compressor through the refrigerant suction pipe.

As an example, the refrigerant suction pipe may be disposed to overlap the refrigerant connection pipe in a longitudinal direction of the casing. Thus, both ends of the refrigerant suction pipe are fixed to both sides in the longitudinal direction of the casing, and the distance between the outlet of the refrigerant connection pipe and the inlet of the refrigerant suction pipe can be increased.

As an example, the refrigerant suction pipe may be disposed on an axial center of the casing, and the refrigerant connection pipe may be disposed eccentrically with respect to the axial center of the casing. Thereby, the refrigerant suction pipe is fixed to the casing, and the refrigerant connection pipe can penetrate the top surface of the casing to communicate with the refrigerant housing space.

As another example, the refrigerant connection pipe may be disposed closer to the axial center of the compressor than the refrigerant suction pipe. This reduces vibration at the joint between the housing and the refrigerant connection pipe.

For example, the other end of the refrigerant connection pipe may be open to the refrigerant accommodating space, and the refrigerant suction pipe may be provided with at least one or more refrigerant through holes communicating with the refrigerant accommodating space. The refrigerant passage hole may be formed higher than or equal to the other end of the refrigerant connection pipe with respect to the longitudinal direction of the case. This allows the refrigerant to flow in the refrigerant housing space for a long time or a long distance, and improves the separation effect between the gas refrigerant and the liquid refrigerant.

As another example, the refrigerant through hole may be opened in a direction intersecting a direction in which the refrigerant suction pipe and the refrigerant connection pipe face each other. Thus, by further increasing the distance between the refrigerant connection pipe and the refrigerant suction pipe, the flow time and the long flow distance of the refrigerant can be ensured.

As an example, a filter (screen) member that filters foreign substances that are about to flow into the refrigerant housing space may be coupled to the other end of the refrigerant connection pipe. This can improve the reliability of the compressor by suppressing the inflow of oil or foreign matter into the compression chamber.

As another example, the filter member may be formed of a mesh screen (mesh screen), and the mesh screen may be formed at or inserted into the other end of the refrigerant connection pipe, and the refrigerant connection pipe may be provided with a filter support portion for supporting the filter member. Thereby, the refrigerant flows rapidly to the bottom surface of the refrigerant housing space through the refrigerant connection pipe.

As another example, the refrigerant connection pipe may include: a first guide portion extending in a lengthwise direction of the case in the refrigerant accommodating space; and a second guide portion bent and extended from the first guide portion toward one direction or two directions. The filter mesh member is inserted into the first guide portion and supported at a position where the second guide portion of the first guide portion is bent. Thus, the refrigerant flows to the side surface of the refrigerant accommodating space via the refrigerant connection pipe, and therefore, the liquid refrigerant and the gas refrigerant can be further effectively separated by the cyclone (cyclone) effect. In addition, the filter screen member can be stably supported without adding an additional support member, thereby reducing the manufacturing cost and improving the reliability.

As an example, the housing may include: a main body having a lower end covered, the refrigerant suction pipe being coupled to a lower end of the casing in a penetrating manner, and an upper end opened; and an upper cover (cap) covering an upper end of the main body, the refrigerant connection pipe penetrating the upper cover. A pipe fixing portion may be formed in the upper cover so that one end of the refrigerant suction pipe is inserted and fixed, and a through hole may be formed at one side of the pipe fixing portion so that the refrigerant connection pipe passes through and is coupled to the pipe fixing portion. Thus, even when the pipe holder is eliminated, both ends of the refrigerant suction pipe can be stably fixed to the casing.

As another example, the pipe fixing portion may be formed at a center of the upper cover, and the through hole may be formed eccentrically from the center of the upper cover toward an axial center side of the compressor. Thus, vibration caused by the refrigerant connection pipe can be reduced by bringing the refrigerant connection pipe close to the compressor side.

As another example, the pipe fixing portion may be formed to be recessed from an inner surface of the upper cover, on which the refrigerant housing space is formed, toward an outer surface of the upper cover. One end of the refrigerant suction pipe may be inserted into and fixed to the pipe fixing portion. Thus, vibration of the accumulator can be reduced by fixing the refrigerant suction pipe to the case without providing an additional pipe holder.

As another example, the through hole may be formed in the center of the upper cover, and the pipe fixing portion may be formed eccentrically from the center of the upper cover toward the axial center side of the compressor or away from the axial center side of the compressor. Thus, the refrigerant suction pipe is brought close to the compressor side, whereby vibration caused by the refrigerant suction pipe can be reduced.

As an example, the refrigerant suction pipe may include: a refrigerant flow path pipe accommodated in the refrigerant accommodating space of the casing; and a refrigerant suction pipe having one end communicating with the refrigerant flow path pipe and the other end communicating with a suction side of the compressor. Both ends of the refrigerant flow path pipe in the longitudinal direction may be fixed to both sides of the case in the longitudinal direction, respectively. This reduces vibration caused by the refrigerant suction pipe, and increases the degree of freedom in selecting a material for the connecting member between the compressor and the accumulator.

As an example, the refrigerant suction pipe may be formed as a single pipe, one side of the refrigerant suction pipe may be fixed to a shell of the compressor, and the other side of the refrigerant suction pipe may be fixed to both sides of the shell in a longitudinal direction. This reduces the number of parts to reduce the manufacturing cost, and also allows easy and stable coupling of the refrigerant suction pipe.

In order to achieve the above object, the present invention may provide a compressor including a housing, a motor, a compressor, and an accumulator. The inner space of the housing may be sealed. The electric part may be provided in an inner space of the housing. The compression unit may be provided in an internal space of the casing, and the refrigerant may be compressed and discharged into the internal space of the casing by being driven by the electric driving unit. The reservoir is disposed outside the housing, supported by the housing, and may penetrate the housing and be connected to the compression portion. As a result, most of the liquid refrigerant can be separated from the refrigerant drawn into the compressor by the evaporator, and the gas refrigerant is drawn mainly into the compressor.

Here, the accumulator may include a case, a refrigerant connection pipe, and a refrigerant suction pipe. The housing may have a refrigerant receiving space. One end of the refrigerant connection pipe extends to the outside of the refrigerant housing space, and the other end may communicate with the refrigerant housing space of the case. One end of the refrigerant suction pipe may communicate with the refrigerant accommodating space of the casing, and the other end may communicate with a suction side of the compressor. Thus, the refrigerant sucked into the refrigerant accommodating space through the refrigerant connection pipe can flow into the refrigerant suction pipe after circulating in the refrigerant accommodating space.

Further, at least a part of the refrigerant connection pipe and the refrigerant suction pipe may overlap in the axial direction and be arranged parallel to each other. Thereby, the outlet of the refrigerant connection pipe and the inlet of the refrigerant suction pipe can be arranged at a long distance.

Further, the refrigerant suction pipes may be fixed to a bottom surface and a top surface of the case forming the refrigerant accommodating space, respectively. Thus, the refrigerant suction pipe can be firmly fixed to the casing of the accumulator without an additional pipe holder.

Drawings

Fig. 1 is a system diagram showing a refrigeration cycle apparatus to which a rotary compressor of the present embodiment is applied.

Fig. 2 is a front view showing a rotary compressor to which the accumulator of the present embodiment is applied.

Fig. 3 is a cross-sectional view of fig. 2.

Fig. 4 is an exploded perspective view of the reservoir of the present embodiment.

Fig. 5 is a perspective view illustrating the assembled reservoir of fig. 4.

Fig. 6 is a sectional view showing the inside of the reservoir in fig. 5.

FIG. 7 is a cross-sectional view taken along the line "VII-VII" in FIG. 6.

Fig. 8A and 8B are graphs showing the vibration of the accumulator of the present embodiment compared with the vibration of the prior art accumulator, fig. 8A is a graph showing the change in vibration in the refrigerant connection pipe, and fig. 8B is a graph showing the change in vibration in the refrigerant suction pipe.

Fig. 9A and 9B are graphs comparing and showing noise during cooling and heating of a compressor to which an accumulator of the present embodiment is applied with noise during cooling and heating of a compressor of the related art, fig. 9A is a graph showing noise during cooling comparing the present invention with the related art, and fig. 9B is a graph showing noise during heating comparing the present invention with the related art.

Fig. 10 is a perspective view showing another example of the refrigerant connection pipe of the present embodiment.

Fig. 11 is a cross-sectional view taken along line XI-XI for explaining an embodiment of the refrigerant guide pipe in fig. 10.

Fig. 12 is a cross-sectional view taken along line XI-XI for explaining another embodiment of the refrigerant guide pipe in fig. 10.

Fig. 13 is a sectional view showing still another embodiment of the reservoir.

Fig. 14 is a sectional view showing still another embodiment relating to the reservoir.

Fig. 15 is a sectional view showing still another embodiment of the reservoir.

Fig. 16 is a sectional view showing still another embodiment relating to the reservoir.

Detailed Description

Hereinafter, an accumulator for a compressor and a compressor having the same according to an embodiment shown in the drawings will be described in detail.

For reference, the accumulator for a compressor of the present embodiment may be applied not only to a vertical type compressor in which a housing forming an appearance of the compressor is disposed along a vertical direction, but also to a horizontal type compressor in which the housing is disposed along a horizontal direction. In addition, the accumulator for a compressor of the present embodiment may be applied not only to a rotary compressor in which a compression portion is formed by rolling pistons (or rollers) and vanes, but also to a scroll compressor in which a compression portion is formed by a plurality of scroll plates being engaged with each other. In addition, the accumulator of the present embodiment may be applied not only to a rotary compressor and a scroll compressor but also to a compressor using an accumulator, such as a high pressure type compressor in which a refrigerant suction pipe is directly connected to a compression portion. Hereinafter, description will be made centering on a general rotary compressor in which a vane is inserted into a vane groove formed in a cylinder tube and is in sliding contact with an outer circumferential surface of a rolling piston (or roller).

Referring to fig. 1, the refrigeration cycle apparatus to which the rotary compressor of the present embodiment is applied is configured such that a compressor 10, a condenser 20, an expander 30, an evaporator 40, and an accumulator 50 form a closed loop. That is, the condenser 20, the expander 30, the evaporator 40, and the accumulator 50 are connected in this order to the discharge side of the compressor 10, and the discharge side of the evaporator 40 is connected to the suction side of the compressor 10 via the accumulator 50. Thus, a series of processes in which the refrigerant compressed by the compressor 10 is discharged to the condenser 20 side, passes through the expander 30, the evaporator 40, and the accumulator 50 in order, and is again sucked into the compressor 10 is repeated.

However, in general, the accumulator 50 is disposed adjacent to a suction side of the compressor 10 and functions to separate liquid refrigerant from refrigerant to be sucked into the compressor 10, and thus the accumulator 50 may be understood as a component of the compressor, not forming a part of the refrigeration cycle apparatus.

Fig. 2 is a front view showing a rotary compressor to which an accumulator of the present embodiment is applied, and fig. 3 is a sectional view of fig. 2.

Referring to fig. 2 and 3, in the rotary compressor of the present embodiment, an electric motor unit 120 is provided in an inner space 110a of a casing (shell) 110, and a compression unit 130 is provided below the electric motor unit 120, and the compression unit 130 sucks and compresses a refrigerant and then discharges the refrigerant into the inner space 110a of the casing 110. The motor unit 120 and the compressor unit 130 are mechanically connected by a rotating shaft 125.

The inner space of the casing 110 is sealed, and a refrigerant suction pipe 532 is coupled to the lower half portion, and the refrigerant suction pipe 532 constitutes a part of a refrigerant suction pipe 53 described later and is connected to the outlet side of the accumulator 50. A refrigerant discharge pipe 113 connected to the condenser 20 is connected to an upper portion of the casing 110. The refrigerant discharge pipe 113 is coupled to a rotary shaft 125 described later on the same axis.

The refrigerant suction pipe 532 passes through the casing 110 and is directly connected to the suction port 1331 of the cylinder tube 133, and the refrigerant discharge pipe 113 passes through the casing 110 and communicates with the internal space 110a. Thus, the compressor constitutes a high-pressure compressor that generates discharge pressure in the internal space 110a of the casing 110.

The aforementioned accumulator 50 is provided on the upstream side of the refrigerant suction pipe 532, i.e., between the evaporator 40 and the compressor 10. The reservoir 50 includes: a case (case) 51 having a refrigerant accommodating space 51a; a refrigerant connection pipe 52 penetrating the upper end of the casing 51 and communicating with the refrigerant accommodating space 51a; and a refrigerant suction pipe 53 penetrating the lower end of the casing 51 and communicating with the refrigerant accommodating space 51a. The reservoir 50 will be described again later.

The electromotive part 120 includes a stator 121 and a rotor 122. The electric unit 120 may be understood as a general rotation motor or a driving motor.

The stator 121 is fixed to the inside of the housing 110, and the rotor 122 is rotatably inserted into the inside of the stator 121. Stator coil 1211 is wound around stator 121, and a permanent magnet (not shown) is inserted into rotor 122.. The rotating shaft 125 is press-fitted into the center of the rotor 122.

The compression section 130 includes a main bearing section plate (hereinafter, referred to as a main bearing section) 131, a sub bearing section plate (hereinafter, referred to as a sub bearing section) 132, a cylinder 133, a rolling piston 134, and a vane (vane) 135.

The main bearing portion 131 is fixedly coupled to an inner peripheral surface of the housing 110, and a sub bearing portion 132 is provided below the main bearing portion 131 via a cylinder 133, and the sub bearing portion 132 supports the rotary shaft 125 together with the main bearing portion 131. The main bearing portion 131 may be referred to as an upper bearing portion, and the sub bearing portion 132 may be referred to as a lower bearing portion, as viewed in the longitudinal direction.

The main bearing portion 131 includes: a main plate 1311 that covers the top surface of the cylinder 133 and forms a compression chamber V together with the cylinder 133; and a main boss portion 1312 that extends from the main plate portion 1311 in the axial direction of the rotation shaft 125, and supports the rotation shaft 125.

Main plate 1311 is formed in a circular plate shape, and its outer peripheral surface is press-fitted or welded to the inner peripheral surface of casing 110. The main plate 1311 has a discharge port 1313 for discharging the refrigerant compressed in the compression chamber V, and a discharge valve 1315 for opening and closing the discharge port 1313 is provided at an end of the discharge port 1313.

The sub bearing portion 132 includes: a sub-plate portion 1321 that forms a compression chamber V together with the cylinder 133; and a sub boss portion 1322 that extends from the sub plate portion 1321 in the axial direction of the rotation shaft 125 and supports the rotation shaft 125.

The sub plate portion 1321 is formed in a circular plate shape, and is bolt-fastened to the main plate portion 1311 together with the cylinder tube 133, a sub support hole 1322a is formed in the sub boss portion 1322, and the rotary shaft 125 is inserted through and supported by the sub support hole 1322 a.

A cylinder 133 that forms a compression chamber V together with the main bearing 131 and the sub bearing 132 is provided between the main bearing 131 and the sub bearing 132. The cylinder tube 133 is fastened and fixed to the main bearing portion 131 together with the sub bearing portion 132 by bolts.

The cylinder 133 is formed in a ring shape, the compression chamber V is formed inside the cylinder 133 by the main bearing portion 131 and the sub bearing portion 132, a suction port 1331 penetrating from the outer peripheral surface to the inner peripheral surface is formed at one side of the cylinder 133, a blade groove 1332 is formed at one side of the suction port 1331, and the blade 135 is slidably inserted into the blade groove 1332.

A rolling piston 134 is provided in the compression chamber V of the cylinder tube 133, the rolling piston 134 is eccentrically coupled to the rotary shaft 125, and compresses the refrigerant while performing a swirling motion, and vanes 135 are slidably inserted into an inner circumferential surface of the cylinder tube 133, the vanes 135 contacting the rolling piston 134 and dividing the compression chamber V into a suction chamber and a compression chamber together with the rolling piston 134.

The rolling piston 134 is formed in a ring shape and rotatably coupled to an eccentric portion (not denoted by reference numeral) of the rotating shaft 125, and the vane 135 is slidably inserted into the vane groove 1332 of the cylinder 133 and contacts the outer circumferential surface of the rolling piston 134. Thus, the compression chamber V of the cylinder 133 is divided by the vane 135 into a suction space (not denoted with a reference numeral) communicating with the suction port 1331 and a discharge space (not denoted with a reference numeral) communicating with the discharge port 1313.

The unexplained reference numeral 115 in the drawing denotes a fixing bracket, and 136 denotes a discharge muffler.

The rotary compressor of the present invention as described above operates as follows.

That is, when power is applied to stator 121, rotor 122 and rotary shaft 125 rotate inside stator 121 and rolling piston 134 revolves, and the volume of the suction space for forming compression chamber V increases with the revolving motion of rolling piston 134. Then, the refrigerant flows from the evaporator 40 into the refrigerant accommodating space 51a of the accumulator 50 communicating with the compression chamber V via the refrigerant connection pipe 52.

This refrigerant is separated into a gas refrigerant and a liquid refrigerant in the refrigerant accommodating space 51a of the accumulator 50, the gas refrigerant is directly sucked into the compression chamber V via the refrigerant suction pipe 53, and on the contrary, the liquid refrigerant is accumulated in the lower half of the refrigerant accommodating space 51a, is gasified, and is sucked into the compression chamber V via the refrigerant suction pipe 53.

On the other hand, the refrigerant sucked into compression chamber V is gradually compressed by the orbiting motion of rolling piston 134, and is discharged from the discharge space to discharge muffler 136 through discharge port 1313 provided in main bearing portion 131, and then discharged to internal space 110a of casing 110. The refrigerant moves to the condenser 20 through the refrigerant discharge pipe 113, and then a series of processes of sucking the refrigerant into the compression chamber V through the above-described processes are repeated.

At this time, the compressor 10 vibrates due to the electromotive part 120 and the compression part 130, the vibration generated in the compressor 10 is transmitted to the accumulator 50 through the refrigerant suction pipe 53 and the fixing bracket 115, and the vibration is transmitted to the refrigeration cycle apparatus through the refrigerant connection pipe 52 connected to the accumulator 50, thereby increasing noise of the outdoor unit including the refrigeration cycle apparatus. In view of this, in the related art, a pipe holder (not shown) for supporting the refrigerant suction pipe 53 is additionally provided inside the accumulator 50. However, as an additional pipe holder is provided, the number of parts and the number of assembly steps increase, which may result in an increase in the manufacturing cost of the accumulator 50.

The refrigerant flowing into the refrigerant accommodating space 51a of the accumulator 50 through the refrigerant connection pipe 52 is quickly sucked from the refrigerant accommodating space 51a into the refrigerant suction pipe 53, and moves to the compression chamber V of the compressor 10.

However, in the conventional technology, since the refrigerant connection pipe 52 and the refrigerant suction pipe 53 are arranged on the same axis, the outlet of the refrigerant connection pipe 52 and the inlet of the refrigerant suction pipe 53 are close to each other, and thus the gas refrigerant and the liquid refrigerant cannot be sufficiently separated in the refrigerant housing space 51a, and a large amount of liquid refrigerant flows into the compression chamber V, which may reduce the compression efficiency and reliability. Furthermore, if the outlet of the refrigerant connection pipe 52 and the inlet of the refrigerant suction pipe 53 are close to each other, the refrigerant is rapidly sucked into the refrigerant suction pipe 53 from the refrigerant connection pipe 52, and the suction noise in the refrigerant accommodating space cannot be attenuated, so that the noise of the outdoor unit including the compressor 10 and the accumulator 50 may be increased.

Thus, in the present embodiment, by fixing both ends of at least one of the refrigerant connection pipe 52 and the refrigerant suction pipe 53 to both sides of the case 51 constituting the accumulator 50, the vibration of the accumulator 50 can be suppressed while eliminating the pipe holder. Further, by moving one of the refrigerant connection pipe 52 and the refrigerant suction pipe 53 to a position adjacent to the compressor, vibration of the accumulator 50 can be further suppressed. This can reduce the manufacturing cost and vibration of the reservoir 50.

Further, by disposing the outlet of the refrigerant connection pipe 52 lower than the inlet of the refrigerant suction pipe 53, the effect of separating the gas refrigerant and the liquid refrigerant in the refrigerant housing space 51a is improved, and suction noise can be attenuated.

Fig. 4 is an exploded perspective view showing the reservoir of the present embodiment, fig. 5 is an assembled perspective view showing the reservoir of fig. 4, fig. 6 is a sectional view showing the interior of the reservoir of fig. 5, and fig. 7 is a sectional view taken along the line "vii-vii" of fig. 6.

Referring to fig. 4 to 7, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The casing 51 is disposed outside the compressor 10, the refrigerant connection pipe 52 connects the outlet of the evaporator 40 and the inlet of the accumulator 50, and the refrigerant suction pipe 53 connects the outlet of the accumulator 50 and the suction side of the compressor 10. As a result, the refrigerant flows from the evaporator 40 into the accumulator 50 through the refrigerant connection pipe 52, and is sucked into the compression chamber V of the compressor 10 through the refrigerant suction pipe 53.

Referring to fig. 4 and 5, the housing 51 includes a cylindrical body 511 and an upper cover 512. The cylinder body 511 and the upper cover 512 may be respectively formed of steel (steel) material.

The cylindrical body 511 may be formed of one cylindrical body, or a plurality of cylindrical bodies may be connected in a length direction to form one cylindrical body. In the present embodiment, description will be made centering on an example in which one cylindrical body 511 is formed. In addition, the cylindrical body 511 merely defines the shape thereof symbolically, and does not necessarily need to be cylindrical. For example, it may be formed of a rectangular barrel shape or the like.

The cylindrical body 511 may be formed in a shape in which a lower end of both ends in a length direction (or an axial direction) is closed and an upper end is opened. However, the lower end of the cylindrical body 511 is integrally extended from the side surface of the cylindrical body 511 and covered, and a first piping hole 511a may be formed through the center of the cylindrical body 511 along the length direction of the housing 51 such that the refrigerant flow path pipe 531 penetrates the first piping hole 511a. However, the lower end of the cylindrical body 511 may be formed in an open shape, as in the upper end. Hereinafter, the description will be made centering on the cylinder main body 511 with the lower end blocked.

The lower end of the cylinder body 511 may be formed in a downwardly convex hemispherical shape. However, the lower end of the cylinder body 511 is not necessarily limited to the hemispherical shape. For example, the lower end of the cylinder main body 511 may be formed flat, or may be in an upward hemispherical shape. However, the lower end of the cylindrical body 511 formed in the downwardly hemispherical shape is advantageous in terms of vibration compared to the lower end of the cylindrical body 511 formed in the flat shape, and is easy to manufacture and advantageous in securing the volume of the refrigerant housing space 51a compared to the upwardly hemispherical shape.

A first pipe hole 511a is formed in the lower end of the cylindrical body 511. The first pipe hole 511a is a hole into which a first end 531a of a refrigerant flow passage pipe 531 constituting a part of a refrigerant suction pipe 53 described later is inserted and fixed to the housing 51.

For example, the first pipe hole 511a may be formed to penetrate through the center of the lower end of the cylindrical body 511. Thus, the refrigerant flow path pipe 531 can penetrate the center of the lower end of the cylindrical body 511 in the longitudinal direction of the housing 51 and be coupled to the cylindrical body 511.

A cylindrical first extending protrusion (not denoted by a reference numeral) surrounding the first pipe hole 511a may be formed on the outer periphery of the first pipe hole 511a. Thus, the first end 531a of the refrigerant flow passage tube 531 inserted into and drawn out of the first piping hole 511a can be welded to the first extending protrusion and can be stably supported.

The cylindrical body 511 may be formed to have the same inner diameter along the length direction of the housing 51. However, the cylindrical body 511 may be formed such that the inner diameter thereof differs along the longitudinal direction of the housing 51. For example, the cylindrical body 511 may be formed in a truncated cone shape having an inner diameter gradually increasing toward the lower side. In this case, since the center of gravity is moved downward, it is advantageous in terms of vibration attenuation, and may also be advantageous in terms of the separation effect of the liquid refrigerant.

The cylinder body 511 may be fixed to the shell 110 of the compressor 10 by at least one fixing bracket 115. For example, in the case where the fixed bracket 115 is one, it may be advantageous in terms of vibration attenuation that the fixed bracket 115 supports the upper half of the cylinder main body 511.

Referring to fig. 4 and 5, the upper cover 512 of the present embodiment may be formed in a flat circular plate shape as a whole. However, the upper cover 512 may be formed in a dome shape slightly convex upward, i.e., toward a direction away from the refrigerant receiving space 51a. This is advantageous in reducing noise, and also in preventing corrosion and the like by suppressing moisture or rainwater from accumulating on the top surface of the accumulator 50 even if moisture generated in the outdoor unit of the refrigeration cycle apparatus or rainwater and the like infiltrate during outdoor installation.

The flat portion 512a may be formed to traverse in the lateral direction at the center portion of the upper cover 512, and inclined surface portions 512b inclined downward may be continuously formed at both sides of the flat portion 512 a. A second pipe hole 512c is formed on one side of the flat surface portion 512a along the longitudinal direction of the housing 51. The second pipe hole 512c is a hole through which the refrigerant connection pipe 521 constituting a part of the refrigerant connection pipe 52 is inserted and coupled. A cylindrical second extending protrusion (no reference numeral) extending along the outer periphery of the second pipe hole 512c may be formed on the outer surface of the upper cover 512. Thus, the refrigerant connection pipe 521 inserted through the second pipe hole 512c can be welded to the second extended protrusion (not denoted by a reference numeral) and can be stably supported.

The second pipe hole 512c may be formed eccentrically from the axial center CL2 of the accumulator 50, that is, the axial center of the housing 51 or the center O of the upper cover 512. For example, the second pipe hole 512c may be formed to be offset from the center O of the upper cover 512 to the axial center CL1 side of the compressor 10 to the maximum. As a result, the refrigerant pipe connected to the refrigerant connection pipe 52 is disposed close to the compressor 10 side, which is a vibration source, and secondary vibration transmitted from the compressor 10 can be attenuated.

Referring to fig. 5 and 6, a pipe fixing portion 512d for inserting and fixing the refrigerant flow pipe 531 may be formed at the center CL2 of the accumulator 50 or the center O of the upper cover 512 constituting the center of the casing 51. For example, the pipe fixing portion 512d may extend from the outer surface of the upper cover 512 in a direction away from the refrigerant housing space 51a. In other words, the pipe fixing portion 512d may be recessed by a predetermined depth when viewed from the inner surface of the upper cover 512. Thus, the first end 531a of the refrigerant flow passage tube 531 is inserted into the tube fixing portion 512d and can be fixed by welding.

The depth of insertion of the refrigerant flow path tube 531 can be determined by the height of the pipe fixing portion 512d. Thus, it is possible to form the pipe fixing portion 512d to have a height as high as possible, which is advantageous in terms of stability of the refrigerant passage pipe 531.

Referring to fig. 4 to 7, the refrigerant connection piping 52 of the present embodiment may include a refrigerant connection pipe 521 and a refrigerant guide pipe 522. The refrigerant connection pipe 52 may extend in the refrigerant housing space 51a of the housing 51 along the longitudinal direction of the housing 51, and may be disposed parallel to the housing 51.

The refrigerant connection pipe 521 may be formed of the same material as a general refrigerant pipe, for example, a copper pipe (copper pipe). However, the refrigerant connection pipe 521 may be formed of the same material as the upper cover 512, for example, a steel pipe (steel pipe) in some cases.

One end of the refrigerant connection pipe 521 is inserted into the second pipe hole 512c formed eccentrically from the center of the upper cover 512, and may be welded to the second extended protrusion of the upper cover 512. The other end of the refrigerant connection pipe 521 extends toward the outside of the upper cover 512, i.e., in a direction away from the refrigerant accommodating space 51a, and can be connected to a refrigerant pipe extending from the outlet of the evaporator 40.

The refrigerant connection pipe 521 may be formed in a straight pipe having a length direction parallel to the case 51. Thus, the refrigerant pipe can be connected to the refrigerant connection pipe 521 at a position on the same axis, for example, at a position offset toward the compressor 10 from the refrigerant suction pipe 53. This can minimize the amount of vibration of the compressor 10 transmitted to the refrigerant pipe.

Although not shown, one end of the refrigerant connection pipe 521, that is, an end connected to the refrigerant pipe may be bent so as to be positioned on the same axis as the refrigerant suction pipe 53. Accordingly, the refrigerant connection pipe 521 is connected to the casing 51 near the compressor 10, so that the vibration of the accumulator 50 can be attenuated, and an existing production line for connecting the accumulator 50 and the refrigerant pipe can be used.

The refrigerant guide pipe 522 may be formed of the same material as the refrigerant connection pipe 521, for example, may be formed as a copper pipe. The refrigerant guide pipe 522 may be formed as a straight pipe and may be located on the same axis as the refrigerant connection pipe 521. For example, the refrigerant guide pipe 522 may be formed in a cylindrical shape of which both ends are opened in the length direction of the case 51 and the wall surface between both ends is blocked.

In other words, a portion of the upper end of the refrigerant guide pipe 522 may be enlarged and opened such that the lower end of the refrigerant connection pipe 521 is inserted into the refrigerant guide pipe 522. Thus, the lower end of the refrigerant connection pipe 521 may be inserted into the periphery of the inner end of the second pipe hole 512c and welded to the upper end of the refrigerant guide pipe 522.

The lower end of the refrigerant guide pipe 522 is formed to have substantially the same inner diameter as the refrigerant connection pipe 521, and may be opened toward the bottom surface of the refrigerant accommodation space 51a. Thereby, the filter screen member composed of the mesh screen 523 is inserted into the refrigerant guide pipe 522, and the mesh screen 523 is formed as a mesh bundle (mesh bundle) made of metal and can be welded to the refrigerant guide pipe 522.

Referring to fig. 6, a filter screen support portion 523a for supporting the mesh screen 523 may be formed inside the refrigerant guide pipe 522. The filter screen supporting part 523a may be formed in a stepped manner by winding or inserting an additional ring such that the inner diameter of the refrigerant guide pipe 522 is reduced. In the present embodiment, an example of inserting the ring into the refrigerant guide pipe 522 is disclosed. Thereby, the reliability can be improved by suppressing the screen 523 from being separated from the refrigerant guide pipe 522.

The lower end of the refrigerant guide pipe 522 may extend to approximately the middle height of the cylinder body 511. The lower end of the refrigerant guide pipe 522 constitutes the outlet of the refrigerant connection pipe 52, and the length of the refrigerant guide pipe 522 is formed as long as possible and close to the lower end of the cylindrical body 511, which may be preferable in terms of improving the separation effect of the liquid refrigerant.

However, if the lower end of the refrigerant guide pipe 522 is too close to the bottom surface of the cylinder main body 511, the length of the refrigerant guide pipe 522 is also increased, and thus may be easily affected by vibration. Therefore, the refrigerant guide pipe 522 may preferably have a length such that the lower end of the refrigerant guide pipe 522 is located below a refrigerant passing hole 531c to be described later and is formed to be less than or equal to a length extending from the upper end of the cylinder main body 511, i.e., the upper cover 512, to substantially an intermediate height.

Although not shown, the other end of the refrigerant guide pipe 522 may be welded in contact with the bottom surface of the cylindrical body 511, or may be inserted and coupled as a second end 531b of the refrigerant flow path pipe 531 to be described later by providing an additional pipe fixing portion 512d. In this case, a refrigerant through hole (not shown) for constituting a kind of refrigerant discharge hole may be formed at a lower position than the refrigerant through hole 531c of the refrigerant flow path pipe 531 in the middle of the refrigerant guide pipe 522.

Referring to fig. 4 to 7, the refrigerant suction piping 53 of the present embodiment may include a refrigerant flow path pipe 531 and a refrigerant suction pipe 532. The refrigerant suction pipe 53 may extend in the refrigerant accommodating space 51a of the casing 51 along the longitudinal direction of the casing 51, and may be arranged in parallel with the casing 51. Thus, the refrigerant suction pipe 53 can be disposed parallel to the refrigerant connection pipe 52, and at least a part of the refrigerant suction pipe 53 can be disposed so as to overlap the refrigerant connection pipe 52 in the longitudinal direction (or axial direction) of the casing 51.

The refrigerant flow path tube 531 is formed as a straight tube, and may be located on the same axis as the center of the cylindrical body 511. In other words, the first end 531a of the refrigerant flow path tube 531 may be located at the center of the lower end of the cylindrical body 511, and the second end 531b may be located at the center of the upper cap 512.

Specifically, a first end 531a of the refrigerant passage tube 531 may be inserted into and fixed to the first pipe hole 511a of the cylindrical body 511, and a second end 531b of the refrigerant passage tube 531 may be inserted into and fixed to the pipe fixing portion 512d of the upper cover 512. Accordingly, since both ends of the refrigerant flow tube 531 are fixed to the housing 51, even if the refrigerant flow tube 531 is connected to the compressor 10 via the refrigerant suction tube 532 described later, the secondary vibration of the refrigerant flow tube 531 can be minimized.

The refrigerant flow path pipe 531 may be formed of the same steel (steel) material as the case 51. Thus, the first end 531a and the second end 531b of the refrigerant flow path pipe 531 can be welded to the cylindrical body 511 and the upper cover 512, respectively.

Although not shown, at least one of both ends of the refrigerant flow path pipe 531 may further include an elastic member (not shown) such as rubber. For example, an elastic member may be inserted between the outer peripheral surface of the second end 531b of the refrigerant passage tube 531 and the inner peripheral surface of the pipe fixing portion 512d into which the second end 531b of the refrigerant passage tube 531 is inserted, or an elastic surface (or an elastic layer) may be coated. In this case, the refrigerant flow path pipe 531 may be press-fitted to the upper cover 512, instead of being welded. Therefore, in this case, the refrigerant flow path tube 531 may be formed of a different material from the upper cover 512, for example, a copper tube.

A refrigerant through hole 531c communicating with the refrigerant accommodating space 51a may be formed between the first and

second ends

531a and 531b at an intermediate height of the refrigerant passage tube 531. For example, the refrigerant passing hole 531c may be formed to be higher than or equal to the lower end of the refrigerant guide pipe 522 constituting the outlet of the refrigerant connection pipe 52, or may be preferably located higher than the lower end of the refrigerant guide pipe 522 by a preset height Δ H.

In other words, the refrigerant flow path pipe 531 constituting a part of the refrigerant suction pipe 53 may overlap the refrigerant guide pipe 522 constituting a part of the refrigerant connection pipe 52 in the longitudinal direction (or axial direction) of the casing 51. Accordingly, a predetermined distance can be secured between the outlet of the refrigerant connection pipe 521 and the inlet of the refrigerant flow path pipe 531.

Thereby, the refrigerant flowing into the refrigerant accommodating space 51a via the lower end of the refrigerant guide tube 522 is moved to the refrigerant through hole 531c after swirling in the refrigerant accommodating space 51a without being directly moved to the refrigerant through hole 531c, so that the liquid refrigerant can be effectively separated from the gas refrigerant to be flowed into the refrigerant accommodating space 51a.

However, the position of the refrigerant passing hole 531c may be variously formed as necessary. For example, the refrigerant passing hole 531c is formed close to the lower end of the refrigerant flow path pipe 531 to minimize the moving distance of the refrigerant in the refrigerant accommodating space 51a, or is formed far from the lower end of the refrigerant flow path pipe 531 to maximize the moving distance of the refrigerant in the refrigerant accommodating space 51a. Thus, the frequency band for attenuating noise generated when the refrigerant is sucked can be arbitrarily adjusted while appropriately adjusting the suction amount of the refrigerant.

In addition, the size of one refrigerant passing hole 531c may be formed to be smaller than or equal to the inner diameter or sectional area of the refrigerant flow path pipe 531. For example, the inner diameter or sectional area of the refrigerant passing hole 531c may be formed to be greater than or equal to 0.5 times the inner diameter or sectional area of the refrigerant flow path tube 531 and less than or equal to the inner diameter or sectional area of the refrigerant flow path tube 531.

However, the size of the refrigerant passing hole 531c may be variously formed as necessary. For example, the sectional area of the refrigerant passing hole 531c may be formed to be larger than the inner diameter of the refrigerant flow path pipe 531 to minimize flow path resistance of the refrigerant, or may be smaller than the inner diameter of the refrigerant flow path pipe 531 to minimize the amount of liquid refrigerant flowing to the compressor 10. Thus, the frequency band for attenuating noise generated when the refrigerant is sucked can be arbitrarily adjusted while appropriately adjusting the amount of the refrigerant sucked.

The refrigerant suction pipe 532 is formed in a generally L-shape, and one end thereof may be connected to the first end 531a of the refrigerant flow passage pipe 531, and the other end of the refrigerant suction pipe 532 may penetrate the casing 110 of the compressor 10 and be connected to the suction port 1331. Refrigerant suction pipe 532 may be formed of a copper pipe or a steel pipe. For example, in the case where the casing 110 of the compressor 10 is provided with a connection member (no reference numeral) formed of a copper material, the refrigerant suction pipe 532 is formed as a copper pipe, and in the case where the above-described connection member is formed of a steel material, the refrigerant suction pipe 532 may be similarly formed as a steel pipe.

The reservoir 50 of the present embodiment as described above is more capable of damping vibrations than existing reservoirs. Fig. 8A and 8B are graphs showing the vibration of the accumulator of the present embodiment compared with the vibration of the prior art accumulator, fig. 8A is a graph showing the change in vibration in the refrigerant connection pipe, and fig. 8B is a graph showing the change in vibration in the refrigerant suction pipe.

Referring to fig. 8A, it can be seen that vibration in the refrigerant connection pipe 52 constituting one end of the accumulator 50 of the present embodiment is greatly reduced. That is, the vibration in the refrigerant connection pipe 52 can be gradually increased as the operating frequency (Hz) increases, and in the prior art (for example, patent document 3), it is seen that the vibration increases from about 1000gal to about 2000gal when the operating frequency increases from 50Hz to 90 Hz. However, in this embodiment, it can be seen that the vibration increases from about 1000gal to only 1500gal at the same operating frequency band. As a result, the accumulator 50 of the present embodiment can significantly reduce the vibration in the refrigerant connection pipe 52 as compared with the conventional accumulator.

This can be seen as the amplitude of vibration transmitted from the casing 51 of the accumulator 50 to the refrigerant connection pipe 52 is attenuated because the refrigerant connection pipe 52 is displaced (shift) and connected so as to be offset from the axial center CL2 of the accumulator 50 toward the axial center CL1 side of the compressor 10.

Referring to fig. 8B, it can be seen that the vibration in the refrigerant suction pipe 53 at the other end of the accumulator 50 according to the present embodiment is also greatly reduced. That is, the vibration in the refrigerant suction pipe 53 of the related art may gradually increase as the operation frequency Hz increases. In other words, it can be seen that the vibration in the refrigerant suction piping 53 of the related art can be increased from about 1000gal to about 1400gal when the operation frequency is increased from 50Hz to 90 Hz. However, in this embodiment, the vibration is instead reduced from about 1000gal to 500gal at the same operating frequency band. As a result, the accumulator 50 of the present embodiment can further significantly reduce vibration in the refrigerant suction pipe 53, as compared to the conventional accumulator 50.

As described above, this can be considered that the vibration of the accumulator 50 is attenuated by the axial center CL3 of the refrigerant connection pipe 52 being displaced and connected to the compressor 10 side, and the vibration transmitted from the compressor 10 to the refrigerant suction pipe 53 is attenuated by both ends of the refrigerant flow path pipe 531 constituting the refrigerant suction pipe 53 being fixed to the casing 51 of the accumulator 50.

In addition, the accumulator 50 of the present embodiment can attenuate suction noise as compared to the prior art accumulator.

Referring to fig. 9A, it can be seen that the compressor 10 to which the accumulator 50 of the present embodiment is applied has an effect of reducing noise during cooling compared to the related art (for example, patent document 3). That is, it can be seen that the noise of the compressor 10 of the present embodiment is about 52.5dB during cooling operation at about 70rpm to 80rpm, while the noise of the compressor of the related art is about 53.8dB. Thus, it can be seen that, during cooling, the noise of the compressor 10 to which the accumulator 50 of the present embodiment is applied is reduced by about 1.3dB, compared to the prior art.

In contrast, referring to fig. 9B, it can be seen that the compressor 10 to which the accumulator 50 of the present embodiment is applied has a greater noise reduction effect during heating than during cooling, as compared to the related art. That is, it can be seen that the noise of the compressor 10 of the present embodiment is about 51.3dB, while the noise of the related art compressor is about 53.0dB, during heating operating at about 80rpm to 90 rpm. Thus, it can be seen that the noise of the compressor 10 to which the accumulator 50 of the present embodiment is applied is reduced by about 1.7dB, compared to the related art, during heating.

As described above, it can be seen that the axial center CL3 of the refrigerant connection pipe 52 is displaced and connected to the compressor 10 side, and both ends of the refrigerant flow passage pipe 531 constituting the refrigerant suction pipe 53 are fixed to the casing 51 of the accumulator 50. In particular, in the present embodiment, the inlet of the refrigerant suction pipe 53 is disposed higher than the outlet of the refrigerant connection pipe 52, whereby the refrigerant flowing into the refrigerant housing space 51a of the accumulator 50 via the refrigerant connection pipe 52 can be guided to the refrigerant suction pipe 53 without being rapidly sucked into the refrigerant suction pipe 53 after the refrigerant housing space 51a circulates widely. From this, it can be seen that this is because the suction noise is effectively attenuated in the refrigerant accommodating space 51a of the accumulator 50.

In the present embodiment, the first end 531a of the refrigerant flow path pipe 531 for constituting a part of the refrigerant suction pipe 53 is fixed to the lower end of the cylindrical body 511, and the second end 531b of the refrigerant flow path pipe 531 is fixed to the upper cover 512 for covering the upper end of the cylindrical body 511, whereby the accumulator 50 of the present embodiment can stably fix the refrigerant flow path pipe 531 without additionally providing an additional pipe holder. Thereby, an increase in parts such as the pipe holder can be suppressed, so that the manufacturing cost can be reduced.

On the other hand, the situation with respect to another embodiment of the reservoir is as follows.

That is, in the above-described embodiment, the refrigerant guide pipe is formed as a straight pipe, but may be formed as a bent pipe in some cases.

Fig. 10 is a perspective view showing another embodiment of the refrigerant connecting pipe of the present embodiment, fig. 11 is a cross-sectional view taken along the line XI-XI for explaining one embodiment of the refrigerant guide pipe of fig. 10, and fig. 12 is a cross-sectional view taken along the line XI-XI for explaining another embodiment of the refrigerant guide pipe of fig. 10.

Referring to fig. 10 and 11, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The basic configurations of the casing 51, the refrigerant connection pipe 52, and the refrigerant suction pipe 53 and the operational effects thereof are similar to those of the foregoing embodiment.

However, in the present embodiment, the refrigerant guide pipe 522 constituting a part of the refrigerant connection pipe 52 may be formed as a bent pipe, unlike the linear pipe described above. For example, the refrigerant guide pipe 522 of the present embodiment may be formed in an L-shaped pipe, in which the lower half portion thereof is bent and the outlet thereof is opened toward the inner side surface of the cylindrical body 511.

Specifically, the refrigerant guide pipe 522 may include: a first guide portion 522a for constituting an inlet; and a second guide part 522b for constituting an outlet. The first guide part 522a is inserted into and coupled to the lower end of the refrigerant connection pipe 521, and the second guide part 522b may extend in a lateral direction from the lower end or the middle of the first guide part 522 a.

In this case, the mesh 523 is inserted into the first guide portion 522a, and the outlet of the second guide portion 522b may extend in the circumferential direction along the inner circumferential surface of the cylindrical body 511. Preferably, the outlet end of the second guide portion 522b extends in a direction away from the refrigerant flow path tube 531.

As shown, the first and

second guide parts

522a and 522b may be formed in one body, and may be separated from each other and assembled together according to circumstances. In the case where the first guide portion 522a and the second guide portion 522b are integrally formed, the refrigerant guide pipe 522 is easily manufactured, and in the case where the first guide portion 522a and the second guide portion 522b are assembled, the degree of freedom in designing the shape of the second guide portion 522b may be increased, for example, the second guide portion 522b may be formed to correspond to the inner circumferential surface of the cylindrical body 511, or the like.

The first and

second guide parts

522a and 522b may be formed to have the same inner diameters, and according to circumstances, the inner diameters may be formed to be different from each other. When the inner diameters of the two parts are different from each other, it is preferable that the inner diameter of the second guide part 522b is formed smaller than the inner diameter of the first guide part 522a, so that the mesh 523 can be supported more stably.

The second guide portion 522b may extend from a lower end of the first guide portion 522a, or may extend from a middle of the first guide portion 522 a. In the case where the second guide portion 522b extends from the lower end of the first guide portion 522a, the flow resistance of the refrigerant can be reduced, and conversely, in the case where the second guide portion 522b extends from the middle of the first guide portion 522a, the mesh 523 can be more stably held.

As described above, in the case where the lower half of the refrigerant guide pipe 522 is bent toward the inner side surface of the cylindrical body 511, the refrigerant passing through the refrigerant guide pipe 522 and flowing into the refrigerant accommodating space 51a may rotate in a circular or spiral shape along the inner circumferential surface of the cylindrical body 511. Then, the refrigerant receives a centrifugal force in the refrigerant accommodating space 51a to be rotated, and generates a cyclone effect, so that the separation effect of the gas refrigerant and the liquid refrigerant can be improved. This can further effectively suppress the inflow of the liquid refrigerant into the compression chamber V. Furthermore, compared to the accumulator 50 of the same volume, the separation effect of the liquid refrigerant and the gas refrigerant is improved, and therefore the size of the accumulator 50 can be reduced, so that the miniaturization of the accumulator 50 can be achieved, and the vibration can be further reduced.

In addition, as shown in the present embodiment, in the case where the refrigerant guide pipe 522 is formed as a bent pipe, even if an additional welding work is not performed after the mesh 523 is inserted into the refrigerant guide pipe 522, the mesh 523 can be prevented from being detached from the refrigerant guide pipe 522. Thereby, reliability is improved by suppressing the screen 523 from being detached from the refrigerant guide pipe 522, and manufacturing cost can be reduced by excluding a welding work for fixing the screen 523 to the refrigerant guide pipe 522.

In fig. 10, the second guide portion 522b is bent in a direction substantially perpendicular to the first guide portion 522a, but the second guide portion 522b is not necessarily bent in a perpendicular direction. For example, the outlet of the second guide portion 522b may be formed to be inclined downward by about 45 ° with respect to the first guide portion 522 a. In this case, the refrigerant discharged from the second guide portion 522b may move from the bottom surface of the case 51, i.e., the refrigerant passing hole 531c, toward the bottom surface distant from the refrigerant accommodating space 51a while swirling in a spiral shape, so that the separation effect of the liquid refrigerant may be accordingly improved.

In addition, the second guide portions 522b1 and 522b2 of the present embodiment may be formed of a plurality of portions. For example, referring to fig. 12, the second guide portions 522b1 and 522b2 may extend from the lower end of the first guide portion 522a toward the left and right sides, respectively. In other words, the refrigerant guide pipe 522 of the present embodiment may be formed in a T-shaped pipe shape by combining one first guide 522a and a plurality of second guides 522b1 and 522b 2.

In this case, even if the refrigerant guide pipe 522 is bent, the flow resistance of the refrigerant discharged to the refrigerant accommodating space 51a is reduced by forming the outlets thereof at both sides, so that it is possible to discharge to the refrigerant accommodating space 51a at a faster speed.

Further, since the outlet of the refrigerant guide pipe 522 is formed in plural, the circulation pattern of the refrigerant in the refrigerant accommodating space 51a becomes complicated, and thus collision between the refrigerants increases, so that the separation effect of the liquid refrigerant can be improved.

On the other hand, the case with yet another embodiment of the reservoir is as follows.

That is, in the above-described embodiment, the pipe fixing portion protrudes upward from the upper cover, and the second end of the refrigerant flow passage pipe is inserted into the pipe fixing portion, but, depending on the case, the pipe fixing portion may protrude downward from the upper cover, and the pipe fixing portion may be inserted and fixed into the second end of the refrigerant flow passage pipe.

Fig. 13 is a sectional view showing still another embodiment of the reservoir.

Referring to fig. 13, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The basic configurations of the casing 51, the refrigerant connection pipe 52, and the refrigerant suction pipe 53 and the operational effects thereof are similar to those of the foregoing embodiment.

However, in the present embodiment, a pipe fixing portion 512d is formed at the center of the upper cover 512 constituting a part of the case 51, and the pipe fixing portion 512d may be protruded downward toward the refrigerant housing space 51a. Thus, the second end 531b of the refrigerant flow tube 531 constituting a part of the refrigerant suction tube 53 is fixed to the tube fixing portion 512d of the upper cover 512, and the tube fixing portion 512d can be inserted and fixed to the second end 531b of the refrigerant flow tube 531.

In this case, the pipe fixing portion 512d and the refrigerant flow path pipe 531 may be welded and fixed, or press-fitted and fixed, or an additional elastic member (not shown) may be provided and inserted therein. This is the same as the foregoing embodiment, and the description of the foregoing embodiment is therefore substituted for the specific description thereof.

As described above, when the pipe fixing portion 512d protrudes (is recessed) toward the refrigerant flow path pipe 531, the height of the accumulator 50 is lower than that of the foregoing embodiment by the distance corresponding to the pipe fixing portion 512d, and therefore, at the time of assembling the refrigerant suction pipe 53, it is not necessary to perform work avoiding the pipe fixing portion 512d, and accordingly, the refrigerant suction pipe 53 can be easily assembled. Although not shown, when the refrigerant flow pipe 531 is bent and disposed at the axial center CL2 of the accumulator 50, the pipe fixing portion 512d does not protrude from the upper cover 512, and therefore, the refrigerant flow pipe 531 can be easily disposed at the axial center CL2 of the accumulator 50 by bending.

Further, the pipe fixing portion 512d is formed long, so that the refrigerant flow path pipe 531 can be stably fixed. For example, in order to stably fix the second end 531b of the refrigerant flow passage tube 531, it is advantageous to form the length of the tube fixing portion 512d as long as possible. However, in the case where the pipe fixing portion 512d protrudes to the outside of the upper cover 512, the protruding length of the pipe fixing portion 512d may be limited. In contrast, when the pipe fixing portion 512d is recessed from the upper cover 512 into the refrigerant housing space 51a as in the present embodiment, there is no risk of collision with surrounding components even if the length of the pipe fixing portion 512d is increased. This allows the second end 531b of the refrigerant flow path tube 531 to be fixed more stably.

However, as shown in the present embodiment, when the pipe fixing portion 512d protrudes toward the refrigerant housing space 51a, since the pipe fixing portion 512d is recessed from the outer side surface of the upper cover 512, rainwater may accumulate on the pipe fixing portion 512d and the like when installed outdoors, and corrosion may occur. For this reason, accumulation of rainwater or foreign substances can be suppressed by inserting the cover into the pipe fixing portion 512d recessed from the outer side surface of the upper cover 512.

That is, in the above-described embodiment, the pipe fixing portion for fixing the second end of the refrigerant flow passage pipe is formed in the upper cover, but a pipe hole for passing the refrigerant flow passage pipe therethrough may be formed in the upper cover in some cases.

Referring to fig. 14, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The basic structures of the casing 51, the refrigerant connection pipe 52, and the refrigerant suction pipe 53 and the operational effects thereof are similar to those of the foregoing embodiment.

However, in the present embodiment, the third pipe hole 512e is formed to penetrate the center O of the upper cover 512 along the longitudinal direction of the case 51, and the second end 531b of the refrigerant flow path pipe 531 may pass through the third pipe hole 512e and be welded to the third pipe hole 512e. In this case, the second end 531b of the refrigerant passage tube 531 may be covered by fitting an additional cover member 533 over the second end 531b at the second end 531b of the refrigerant passage tube 531.

As described above, in the case where the second end 531b of the refrigerant passage tube 531 penetrates the upper cover 512 and is covered on the outside, it is possible to allow an error in the assembly length of the refrigerant passage tube 531 to be increased. Thus, when assembling the refrigerant flow tube 531, the upper cover 512 can be stably assembled to the cylindrical body 511 even if the length of the refrigerant flow tube 531 increases due to machining errors or the like.

In other words, as in the above-described embodiment, when the pipe fixing portion 512d is formed in the upper cover 512 and the refrigerant flow path pipe 531 is inserted into the pipe fixing portion 512d, the length of the refrigerant flow path pipe 531 and the height of the pipe fixing portion 512d must be precisely machined. If the length of the refrigerant passage tube 531 is greater than the height of the pipe fixing portion 512d, the upper cover 512 may be suspended from the cylindrical body 511, and in the opposite case, the refrigerant passage tube 531 may not be stably inserted into the pipe fixing portion 512d.

However, when the refrigerant passage tube 531 penetrates the upper cover 512 as in the present embodiment, the length of the refrigerant passage tube 531 can be increased to prevent a poor assembly between the refrigerant passage tube 531 and the upper cover 512 due to a machining error.

That is, in the foregoing embodiment, the refrigerant suction pipe is located at the axial center of the accumulator and the refrigerant connection pipe is displaced from the axial center of the accumulator toward the axial center side of the compressor, but the positions of the refrigerant suction pipe and the refrigerant connection pipe may be reversed from each other depending on the case.

Fig. 15 is a sectional view showing still another embodiment of the reservoir.

Referring to fig. 15, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The basic structures of the casing 51, the refrigerant connection pipe 52, and the refrigerant suction pipe 53 and the operational effects thereof are similar to those of the foregoing embodiment.

However, in the present embodiment, the refrigerant connection pipe 52 penetrates the center O of the upper cover 512 and is coupled to the upper cover 512, and the axial center CL4 of the refrigerant suction pipe 53 may be disposed offset toward the compressor 10 side from the center O of the upper cover 512. For example, the refrigerant guide pipe 522 constituting a part of the refrigerant connection pipe 52 is inserted into the cylindrical body 511 constituting the refrigerant accommodating space 51a at substantially the middle height thereof, and both ends of the refrigerant flow path pipe 531 constituting a part of the refrigerant suction pipe 53 may be welded to the lower end of the cylindrical body 511 and the upper cover 512 and fixed thereto, respectively.

Specifically, the upper cover 512 of the present embodiment has a second pipe hole 512c formed in the center O thereof, so that the refrigerant connection pipe 521 constituting a part of the refrigerant connection pipe 52 can be inserted into the second pipe hole 512c along the axial center CL2 of the accumulator 50. Thus, as in the previous embodiment, the upper cap 512 may be formed in a hemispherical or dome shape with a central portion thereof being convex.

However, in the upper cover 512 of the present embodiment, the pipe fixing portion 512d is formed, and thus the second end 531b of the refrigerant flow passage pipe 531 is fixed to the pipe fixing portion 512d, and the pipe fixing portion 512d may be formed eccentrically from the center of the upper cover 512 toward the compressor 10.

In the present embodiment, the cylindrical body 511 has a first pipe hole 511a formed in a lower end thereof, and the first pipe hole 511a may be located eccentrically from the axial center CL2 of the accumulator 50, for example, between the axial center CL1 of the compressor 10 and the axial center CL2 of the accumulator 50. Thus, as shown in the foregoing embodiment, the position of the bottom surface of the cylindrical main body 511 corresponding to the axial center CL2 of the reservoir 50 may be formed in a hemispherical or dome shape with a convex edge, but a part or the whole of the bottom surface of the cylindrical main body 511 where the first piping hole 511a is formed may be formed in a flat plate shape.

As described above, the refrigerant connection pipe 52 of the accumulator 50 of the present embodiment passes through the axial center CL2 of the accumulator 50 and is connected to the accumulator 50, and thus, the conventional outdoor unit assembly line can be used, and the connection between the compressor 10 and the evaporator 40 can be facilitated.

Further, the refrigerant suction pipe 53 of the accumulator 50 of the present embodiment is eccentrically displaced from the axial center CL2 of the accumulator 50 toward the compressor 10 side and connected to the accumulator 50, whereby the length L1 in the radial direction of the refrigerant suction pipe 532 configuring a part of the refrigerant suction pipe 53 becomes short. Thereby, the vibration transmitted from the compressor 10 via the refrigerant suction pipe 53 can be further attenuated as compared with the foregoing embodiment.

That is, in the above-described embodiment, the refrigerant suction pipe is formed by assembling the refrigerant flow passage pipe and the refrigerant suction pipe, but the refrigerant flow passage pipe and the refrigerant suction pipe may be formed integrally in some cases.

Referring to fig. 16, the accumulator 50 of the present embodiment includes a casing 51, a refrigerant connection pipe 52, and a refrigerant suction pipe 53. The basic structures of the casing 51, the refrigerant connection pipe 52, and the refrigerant suction pipe 53 and the operational effects thereof are similar to those of the foregoing embodiment.

However, the refrigerant suction pipe 53 of the present embodiment may be formed of a single pipe. For example, the refrigerant suction pipe 53 may be formed of one refrigerant passage pipe 531, one end of the refrigerant passage pipe 531 may be fixed to the casing 110 of the compressor 10, and the other end of the refrigerant passage pipe 531 may be inserted into the pipe fixing portion 512d fixed to the upper cover 512 through the first pipe hole 511a of the cylindrical body 511.

In this case, the refrigerant flow passage 531 constituting the refrigerant suction pipe 53 may be formed as a steel pipe such as the cylindrical body 511 or the upper cover 512 of the accumulator 50, or may be formed as a copper pipe such as a connecting member welded to the casing 110 of the compressor 10.

However, since it is necessary to perform welding in a state where the second end 531b of the refrigerant passage tube 531 is inserted into the tube fixing portion 512d of the upper cover 512, it is advantageous in terms of an assembly process that the refrigerant passage tube 531 is formed of the same material as the accumulator 50 as much as possible.

As described above, when the refrigerant suction pipe 53 is formed of one refrigerant flow path tube 531, the number of assembly steps can be reduced and the manufacturing cost can be reduced as compared with the case where the refrigerant suction pipe 53 is formed and assembled of the refrigerant flow path tube 531 and the refrigerant suction tube 532.

In addition, since the refrigerant suction pipe 53 is formed integrally, even if vibration of the compressor 10 is transmitted through the refrigerant suction pipe 53, the refrigerant suction pipe 53 is less likely to be damaged, and thus reliability can be improved.

On the other hand, although not shown, the reservoir 50 is formed in a shape in which the upper end of the cylindrical body 511 is closed, and the lower end thereof is opened and covered by an additional lower cap (not shown), or both ends of the cylindrical body 511 may be opened and covered by the upper cap 512 and the lower cap (not shown), respectively. In this case, as in the above-described embodiment, the refrigerant connection pipe 52 and the refrigerant suction pipe 53 are disposed in parallel to each other so as to overlap in the longitudinal direction of the casing 51, and both ends of the refrigerant suction pipe 53 may be fixed to the casing 51. In this regard, the same is true of the foregoing embodiments, and the description of the foregoing embodiments is therefore intended to be substituted for the specific description thereof.

On the other hand, in the above-described embodiment, the description has been given taking the single rotary compressor having one cylinder tube as an example, but the present invention can be similarly applied to a high-pressure compressor such as a double rotary compressor, a hinge vane rotary compressor, a vane rotary compressor, and a high-pressure scroll compressor in which the cylinder tube is arranged along the axial direction of the rotary shaft, depending on the case. In this regard, the same as the foregoing embodiments are used, and the detailed description thereof is replaced with that of the foregoing embodiments.

Claims

1. An accumulator for a compressor, comprising:

a casing disposed outside a casing of the compressor and having a refrigerant accommodating space;

a refrigerant connection pipe having one end extending to the outside of the refrigerant accommodating space and the other end communicating with the refrigerant accommodating space; and

a refrigerant suction pipe having one end communicating with the refrigerant accommodating space of the casing and the other end communicating with a suction side of the compressor,

the refrigerant suction pipes are fixed to a bottom surface and a top surface of the casing, respectively, which form the refrigerant accommodating space.

2. The accumulator for compressor of claim 1, wherein,

a pipe fixing portion for fixing one end of the refrigerant suction pipe is formed on the top surface of the casing.

3. The accumulator for compressor of claim 2, wherein,

the pipe fixing portion is recessed in a direction away from the refrigerant housing space in a longitudinal direction of the casing such that one end of the refrigerant suction pipe is inserted into the pipe fixing portion.

4. The accumulator for compressor of claim 2, wherein,

the pipe fixing portion protrudes toward the refrigerant accommodating space in a longitudinal direction of the housing and is inserted into one end of the refrigerant suction pipe.

5. The accumulator for compressor of claim 2, wherein,

the pipe fixing portion is formed as a pipe hole penetrating the casing along a longitudinal direction of the casing so that the refrigerant suction pipe penetrates the casing and is fixed.

6. The accumulator for compressor of claim 2, wherein,

the pipe fixing portion is formed on an axial line of the housing.

7. The accumulator for compressor of claim 1, wherein,

at least a portion of the refrigerant suction pipe overlaps the refrigerant connection pipe in a longitudinal direction of the casing.

8. The accumulator for compressor of claim 1, wherein,

the refrigerant suction pipe is disposed on the axial center line of the casing,

the refrigerant connection pipe is disposed eccentrically with respect to the axial center line of the casing.

9. The accumulator for compressor of claim 8, wherein,

the refrigerant connection pipe is disposed closer to an axial center line of the compressor than the refrigerant suction pipe.

10. The accumulator for compressor of claim 1, wherein,

the other end of the refrigerant connection pipe opens into the refrigerant accommodating space,

at least one refrigerant through hole communicating with the refrigerant accommodating space is formed in the refrigerant suction pipe,

the refrigerant through hole is formed higher than or equal to the other end of the refrigerant connection pipe with respect to the longitudinal direction of the case.

11. The accumulator for compressor of claim 10, wherein,

the refrigerant through hole is opened in a direction intersecting a direction in which the refrigerant suction pipe and the refrigerant connection pipe face each other.

12. The accumulator for compressor of claim 1, wherein,

a filter member that filters foreign matter flowing into the refrigerant accommodating space is coupled to the other end of the refrigerant connection pipe.

13. The accumulator for compressor of claim 12, wherein,

the filter member is formed of a mesh which is formed at the other end of the refrigerant connection pipe or inserted into the other end of the refrigerant connection pipe,

the refrigerant connection pipe is provided with a filter screen support portion for supporting the filter screen member.

14. The accumulator for compressor of claim 12, wherein,

the refrigerant connection pipe includes:

a first guide portion extending in a longitudinal direction of the case in the refrigerant accommodating space; and

a second guide portion bent and extended in one direction or two directions from the first guide portion,

the filter mesh member is inserted into the first guide portion and supported at a coupling position of the second guide portion and the first guide portion.

15. The accumulator for compressor of claim 1, wherein,

the housing includes:

a body having a lower end covered, the refrigerant suction pipe penetrating and being coupled to the lower end of the body, and an upper end opened; and

an upper cover covering an upper end of the main body, the refrigerant connection pipe penetrating the upper cover,

a pipe fixing portion into which one end of the refrigerant suction pipe is inserted and fixed is formed in the upper cover,

a through hole is formed at one side of the pipe fixing portion, and the refrigerant connection pipe is inserted through and coupled to the through hole.

16. The accumulator for compressor of claim 15, wherein,

the pipe fixing portion is formed in the center of the upper cover, and the through hole is formed eccentrically from the center of the upper cover toward the axial center of the compressor.

17. The accumulator for compressor of claim 16, wherein,

the pipe fixing portion is formed by being recessed from an inner side surface of the upper cover, which forms the refrigerant housing space, toward an outer side surface of the upper cover, and one end of the refrigerant suction pipe is inserted into and fixed to the pipe fixing portion.

18. The accumulator for compressor of claim 15, wherein,

the through hole is formed in the center of the upper cover, and the pipe fixing portion is eccentrically formed from the center of the upper cover toward the axial center side of the compressor or away from the axial center side of the compressor.

19. The accumulator for compressor of claim 1, wherein,

the refrigerant suction pipe includes:

a refrigerant flow path pipe accommodated in the refrigerant accommodating space of the casing; and

a refrigerant suction pipe having one end communicating with the refrigerant flow passage pipe and the other end communicating with a suction side of the compressor,

both ends of the refrigerant flow path pipe in the length direction are fixed to both sides of the case in the length direction, respectively.

20. A compressor, comprising:

a housing formed with a closed inner space;

an electric unit provided in an internal space of the housing;

a compression unit which is provided in an internal space of the casing and is driven by the electric unit, and which compresses a refrigerant and discharges the refrigerant into the internal space of the casing; and

a reservoir disposed outside the housing and supported by the housing, the reservoir penetrating the housing and being connected to the compression portion,

the accumulator is the accumulator for a compressor of any one of claims 1 to 19.