KR20170043235A - Suction damping device of compressor - Google Patents

Abstract

The present invention relates to a suction pulsation damping device of a compressor, wherein an elastic body (20) into which a flow path hole (21) is formed to penetrate is installed in a suction port (11). In accordance with pressure of refrigerant and a change of a flow rate, the elastic body (20) is elastically deformed to perform damping. Therefore, generation of pulsation can be prevented. Composition of the device is simple, and the number of components is small to reduce a weight and production costs.

Description

TECHNICAL FIELD [0001] The present invention relates to a suction wave pulsation reducing device for a compressor,

The present invention relates to a suction pulsation reducing apparatus for a compressor, and more particularly, to a suction pulsation reducing apparatus for a compressor that is installed in a suction port of a rear head for sucking refrigerant by a compressor to reduce suction pulsation of the refrigerant.

BACKGROUND ART [0002] Compressors that serve to compress refrigerant in an indoor cooling system of a vehicle have been developed in various forms. The compressor mainly includes a reciprocating type in which compression is performed while a refrigerant is compressed and a rotary type in which compression is performed while rotating. The reciprocating type includes a crank type in which a driving force of a drive source is transmitted to a plurality of pistons by using a crank, a swash plate type in which a plurality of pistons are connected to a swash plate, and a wobble plate type in which a wobble plate is used. A rotary type using a vane rotary type, and a scroll type using a revolving scroll and a fixed scroll.

The swash plate type compressor has a fixed displacement type and a variable displacement type. In the fixed displacement type, an electromagnetic clutch is provided on a pulley to control the operation of the compressor. When the compressor is driven or stopped, the RPM of the vehicle flows, .

Therefore, in recent years, a variable displacement type which is not equipped with an electromagnetic clutch and is always driven with the drive of an engine of a vehicle, and which can vary the discharge capacity by changing the inclination angle of the swash plate is widely used. In such a variable displacement swash plate type compressor, a pressure control valve for adjusting the inclination angle of the swash plate is generally used for adjusting the refrigerant discharge amount.

1, the swash plate type compressor includes a housing 100, a rotary shaft 200, a swash plate 300, and a plurality of pistons 400. As shown in FIG.

The housing 100 is a part of an outer body of the swash plate type compressor and has a cylinder chamber 110 accommodating therein a rotary shaft 200, a swash plate 300 and a plurality of pistons 400, Suction passages 121 and 122 for supplying the refrigerant to the cylinder chamber 110 are formed and a discharge passage 140 through which the refrigerant in the cylinder chamber 110 is discharged during the compression stroke is formed.

A suction port 130 through which refrigerant flows from the outside is formed at the tip of the suction flow paths 121 and 122 and a suction check valve 500 is inserted into the suction flow paths 121 and 122. The suction check valve 500 not only interrupts the suction refrigerant but also prevents the pulsation due to the fluctuation of the flow rate and pressure of the suction refrigerant. Therefore, the suction check valve 500 is referred to as a suction pulsation reduction device, that is, an SDD (Suction Damping Device) The suction check valve provided in the suction passage of the compressor will be referred to as a suction pulsation reduction device.)

The rotating shaft 200 is a means for transmitting the rotational driving force of the external driving source to the inside of the compressor. The rotating shaft 200 receives external rotational driving force through the pulley 250 mounted on one end of the rotating shaft 200, and rotates.

The swash plate 300 is mounted on the rotating shaft 200 in an inclined state and rotates together with the rotating shaft 200 as a means for converting the rotational driving force of the rotating shaft 200 into reciprocating linear motion of the piston 400. At this time, a plurality of pistons 400 are mounted on the edge of the swash plate 300 via the shoe 310, and the piston 400 is swung in the cylinder chamber 110 by a straight line And is reciprocated.

The swash plate 300 can adjust its inclination angle. When the inclination angle of the swash plate 300 with respect to the rotation axis 200 is 90 degrees as shown in FIG. 2, the piston 400 does not reciprocate even when the swash plate 300 rotates When the swash plate 300 is inclined with respect to the rotary shaft 200 as shown in FIG. 1, the piston 400 reciprocates in the cylinder chamber 110 and sucks, compresses, and discharges the refrigerant. Compression, and ejection.

As shown in FIG. 3, the suction-pulsation reduction apparatus 500 includes a circular ring-shaped body 510 having a suction port 511 formed thereon, and a cylindrical part coupled to the body 510. The discharge- A core 530 embedded in the case 520 for opening and closing the suction port 511 to connect and disconnect the suction port 511 and the discharge port 521 to interrupt the flow of the refrigerant, 530 in a resilient manner. A plurality of core grooves 531 are axially formed on the outer circumferential surface of the core 530 at regular intervals.

Accordingly, when the air conditioner switch is turned on and the compressor operates, the core 530 is retracted due to the pressure difference between the front and rear cores 530, and the suction port 511 is opened, so that the refrigerant flowing into the suction port 511 is discharged through the discharge port 521 And then sucked into the cylinder chamber 110 through the suction passage 122. In addition, when the air conditioner switch is turned off and the compressor stops, refrigerant pressure does not act on the suction port 511, so that the core 530 is returned to the original position by the spring 540 and the suction port 511 is shut off.

The core 530 is elastically supported by the spring 540 when the refrigerant is sucked through the suction check valve or the suction pulley reduction device 500 as described above so that the pressure on the suction port 511 side is suddenly Damping by the spring 540 is performed even if the pressure fluctuates, so that the impact due to pressure fluctuation is mitigated and the occurrence of pulsation is prevented. Accordingly, vibration and noise are prevented from being generated due to pulsation, so that vibration and noise transmitted from the compressor to the vehicle interior are reduced.

The above-described suction pulsation reduction apparatus is disclosed in Korean Patent Laid-Open No. 10-2011-062109.

In addition to the core and the spring, which are indispensable components for performing a damper function, the conventional pulsation reduction device may include a core and a spring. The case may be connected to an end of the case, And further includes a metal body to be retained, resulting in a large number of parts and a heavy weight.

Also, since the body is required to be press-fitted as described above, the assembly is not easy and the body and the case are separated well.

Also, since the overall length of the device is long, it is not easy to secure a space for installation in the rear head.

On the other hand, one of the key elements of automobile development is fuel efficiency improvement, and each of the devices mounted on the vehicle also simplifies the structure, reduces the number of parts to reduce the weight, and reduces manufacturing cost.

This is also true of a compressor which is a constituent of an air conditioning system. In accordance with this development trend, a suction and pulsation reduction apparatus also needs to develop a new simple structure that can reduce weight and manufacturing cost.

Accordingly, it is an object of the present invention to provide a suction pulsation reducing device for a compressor, which is simple in structure and has a reduced number of parts, thereby reducing weight and manufacturing cost.

According to another aspect of the present invention, there is provided an air purifier including a suction port communicating an outside of a rear head with a suction chamber inside, a suction port provided in a state of blocking the suction port, And an elastic body elastically applying a resisting force to the refrigerant flow in accordance with the refrigerant pressure and flow rate of the refrigerant.

The elastic body may be formed as a flat thin film.

The channel hole formed in the elastic body may be formed in a straight slit shape.

The elastic body may have a circular passage hole formed at an intermediate portion thereof.

The elastic body may be formed so that its thickness decreases from the outer rim toward the inner channel hole.

The elastic body may have a shape bent toward the rear of the suction port toward the inner passage hole from the outer rim portion.

In addition, a plurality of the elastic bodies are provided in the suction port, and the size of the flow holes formed in the plurality of elastic bodies can be sequentially reduced.

A plurality of the elastic bodies may be provided in the suction port, and the respective channel holes formed in the plurality of elastic bodies may be spaced apart from each other at a distance radially outward from the center of the elastic body.

In addition, a plurality of the elastic bodies are provided in the suction port, and the plurality of elastic bodies are all different in thickness, so that damping can be performed over the entire operating region of the compressor.

According to the present invention as described above, since the suction ripple reduction device is constituted by an elastic body having a simple structure, the number of parts, weight, and manufacturing cost are reduced.

Also, since the body and the case used in the conventional suction pulsation reduction device are not used, there is no step of press-fitting the body at the time of assembly, so that the assembly is facilitated and the body and the case are separated from each other.

In addition, since only the elastic body is required to be installed inside the suction port, it does not take up a lot of space for installation as in the conventional suction ripple reduction device, so that it is easy to secure a space for installation in the rear head.

In addition, since the elastic body does not collide with peripheral parts such as the inner circumferential surface of the suction port during operation of the elastic body, the chattering noise is not generated even when the elastic body is repeatedly operated at a high speed. Occurred.)

Further, according to the present invention, a plurality of the elastic bodies are arranged, and the elasticity of the elastic body is variously provided by gradually decreasing the size of the channel hole of each elastic body or by varying the thickness of each elastic body, The damping action can be evenly performed over the entire operation period of the compressor.

1 is a view of a swash plate type compressor;
FIG. 2 is a view of a swash plate type compressor, in which a swash plate is erected. FIG.
3 is a partial cutaway perspective view of a suction pulsation reduction device according to the prior art.
FIG. 4 is an exploded perspective view of a rear head suction port portion showing an installation state of a flat plate-like elastic body as one embodiment of a suction pulsation reduction device according to the present invention. FIG.
5 is a cross-sectional view of a thickness variable elastic member according to another embodiment of the present invention;
Fig. 6 is a perspective view of the above-mentioned Fig. 5;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

4, the suction pulsation reducing device of the compressor according to the present invention includes a suction port 11 for communicating the outside of the rear head 10 with the suction chamber in the inside thereof, And an elastic body 20 which is installed in a state of blocking the suction port 11 and through which the flow hole 21 is formed and elastically applies a resisting force to the refrigerant flow in accordance with the refrigerant pressure and flow rate fluctuation of the suction refrigerant.

The elastic body 20 is in the form of a thin plate-like thin film and is fixed to the inside of the suction port 11 by inserting and fixing the rim portion into the mounting groove 12 formed in the inner peripheral surface of the suction port 11.

The flow path hole 21 may be formed in a slit shape that linearly crosses an intermediate portion of the elastic body 20.

Therefore, the refrigerant moves from the front to the rear of the suction port 11 through the flow passage hole 21, and is supplied to the suction chamber of the rear head 10. [

The pressure and the flow rate of the refrigerant passing through the suction port 11 vary according to the increase and decrease of the cooling load. The elastic body 20 is moved from the flat plate shape shown by the solid line to the suction port 11, the shock due to the sudden pressure change of the refrigerant and the fluctuation of the flow rate is buffered while being elastically deformed repeatedly between deformed shapes.

Therefore, the occurrence of pulsation due to a sudden change in pressure and flow rate of the refrigerant is prevented. Since the occurrence of pulsation is prevented in this manner, the vibration and noise generated by the pulsation do not occur, so that vibration and noise transmitted from the compressor to the room through the refrigerant pipe are reduced.

As described above, since the elastic body 20 serving as a damper has a flat thin film shape, it is possible to implement a suction pulsation reducing apparatus having the simplest structure.

Meanwhile, as shown in FIGS. 5 and 6, the suction pulsation reduction device according to the present invention may have a circular flow passage hole 21 radially inward of the elastic body 20.

Further, the thickness of the elastic body 20 may gradually become thinner toward the radially inner side where the flow hole 21 is formed in the outer rim portion. That is, the relationship between the rim portion thickness a of the elastic body 20 and the radial inward portion thickness b of the elastic body 20 is established.

Further, the elastic body 20 may be formed in a shape that is bent toward the refrigerant flow direction, that is, toward the rear of the suction port 11, from the radially outer side toward the inner side.

The suction port 11 may be provided with a plurality of elastic bodies 20 at predetermined intervals along the flow direction of the refrigerant.

When the plurality of elastic bodies 20 are provided as described above, the area of the flow holes 21 of the respective elastic bodies 20 decreases sequentially from the front side of the suction port 11 toward the rear side, that is, along the flow direction of the refrigerant . That is, the area of the flow passage hole 21 of the elastic body 20 disposed relatively forward is large and the area of the flow passage hole 21 of the elastic body 20 disposed rearward is small.

When a plurality of elastic bodies 20 are provided, the flow passage holes 21 of the elastic bodies 20 are spaced apart from each other with a different amount of eccentricity from the center of the elastic body 20. That is, the distance in which the flow holes 21 are separated from the center of the elastic body 20 is different for each elastic body 20, and the distance is gradually increased or decreased in the plurality of elastic bodies 20 arranged along the refrigerant flow direction It is irregularly increased or decreased.

In the case of the elastic body 20 having the circular passage hole 21 formed therein as described above, the refrigerant moves to the rear of the suction port while expanding the passage hole 21 radially outward. Since the area of the flow hole 21 is elastically increased or decreased in accordance with the refrigerant pressure and the flow rate, damping is effected on the refrigerant pressure and flow rate fluctuations. At this time, the inner portion formed with the flow hole 21 may be deformed to the rear of the suction port along the refrigerant flow direction as compared with the outer portion, and damping can also be performed by the elastic restoring force according to the shape deformation.

On the other hand, when the thickness of the elastic body 20 gradually decreases from the outer rim portion toward the inner flow passage hole 21, the elastic body 20 is more easily deformed by the refrigerant pressure and flow rate variation, The damping action can be achieved even when the pressure and flow rate fluctuations of the refrigerant are small. Accordingly, it is possible to implement a suction pulsation reducing apparatus that performs a damping function in response to pressure and flow rate fluctuations of the refrigerant more sensitively.

The elastic body 20 can be more easily deformed in the refrigerant flow direction even when the shape of the elastic body 20 has a shape bent toward the rear of the suction port 11 toward the inner flow path hole 21 from the outer rim portion The damping performance can be further improved even in the operating section in which the refrigerant pressure and flow rate fluctuations are insignificant.

The elastic body 20 basically satisfies the following relationship. The edge portion thickness a of the elastic body 20 is smaller than the diameter D / 2 of the flow path. The thickness b of the radially inner portion of the elastic body 20 is also smaller than the diameter D / 2 of the flow path. The diameter c of the flow path hole 21 when the flow rate is zero is smaller than the diameter D of the flow path. The distance L from the rim portion of the elastic body 20 to the flow passage hole 21 is smaller than the diameter D of the flow passage.

Meanwhile, the elastic body 20 can be installed in one or more, that is, a plurality of, so that appropriate damping can be performed according to the refrigerant processing capacity (capacity) of the compressor.

When the plurality of elastic bodies 20 are provided, the elastic body 20 can be disposed at predetermined intervals along the refrigerant flow direction, that is, from the front to the back of the suction port 11.

As described above, when the plurality of elastic bodies 20 are provided and the size of the flow hole 21 formed in each of the elastic bodies 20 is sequentially reduced, even if the refrigerant pressure and the flow rate on the inlet side of the suction port 11 suddenly increase As the refrigerant passes through the flow holes 21 gradually reducing in area, the damping action is progressively performed, so that more efficient damping can be achieved as a whole.

In addition, the presence of the channel holes 21 of various sizes can damp vibration and noise in various frequency ranges.

When the flow holes 21 of the plurality of elastic bodies 20 are eccentrically formed with different distances from the center as described above, the direction of propagation of the waves through the flow holes 21 is different for each elastic body 20, The vibration and noise transmission amount is reduced by dispersing the transmission path of vibration and noise through the medium.

The suction ripple reduction device according to the present invention is characterized in that the rim portion thickness a of the elastic body 20, the radially inner side portion thickness b of the elastic body 20, The diameter (c) can be adjusted to achieve damping performance optimized for each operating condition of the compressor.

In addition, since the thicknesses of the elastic members 20 are different from each other when the plurality of elastic members 20 are arranged, the elasticity of the elastic members 20 is different from that of the elastic members 20 ) Performs damping action and the elastic body (20) having a large elastic strength performs a damping action when the refrigerant flows at a high flow rate, thereby achieving a uniform damping performance over the entire operating range of the compressor.

As described above, in the suction ripple reducing device according to the present invention, the damping function is performed by the elastic deformation of the elastic body 20, and the occurrence of pulsation is thereby reduced or prevented.

As described above, since the suction ripple reduction device is realized by the elastic member 20 having a simple structure, the number and weight of parts of the suction ripple reduction device are reduced and the manufacturing cost is reduced. In other words, since components such as the casing and the body of the conventional suction pulsation reduction device are not used, the number and weight of components are greatly reduced and manufacturing costs are reduced.

In addition, since the body and the case of the conventional device are not present, the process of press-fitting the body at the time of assembly is abolished, so that the assembling process is facilitated, and there is no problem that the body and the case are separated from each other. That is, since the suction pulsation reduction device can be manufactured by only one material, problems (assembling property, assembling state stability) caused by coupling between parts made of different materials are not generated.

Further, since the elastic body 20 can be easily formed in a small size and can be installed within a short distance even when a plurality of elastic bodies 20 are provided, the installation space occupied by the suction ripple reduction device is greatly reduced. Therefore, it is easy to secure the installation space of the suction pulsation reduction device in the rear head.

The operation of the present invention is performed by the deformation and restoration of the elastic body 20. Since there is no phenomenon that the elastic body 20 collides with the surrounding parts during deformation and restoration of the elastic body 20, The chattering noise is not generated even when it is repeatedly operated at a high speed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: rear head 11: suction port
12: Installation groove 20: Elastic body
21: Euro hole

Claims (9)

A housing provided with a swash plate provided on a rotating shaft, a plurality of pistons interlocked with the swash plate, and a cylinder bore into which a piston is inserted, and a valve plate mounted on a rear surface of the housing, And a rear head having a discharge chamber through which a refrigerant discharged from a cylinder bore is discharged to the outside of the compressor, the compressor comprising:
A suction port 11 for communicating the suction chamber inside the rear head 10 with the outside of the compressor,
The suction port 11 is provided inside the suction port 11 in a state of blocking the suction port 11 and has a through hole 21 formed therein to elastically resist the refrigerant flow in accordance with the refrigerant pressure and the flow rate fluctuation of the suction refrigerant The elastic body 20,
Wherein the suction pulsation reducing device comprises: The method according to claim 1,
Wherein the elastic body (20) is a flat thin film. The method of claim 2,
Wherein the flow passage hole (21) formed in the elastic body (20) is a straight slit. The method according to claim 1,
Wherein the elastic body (20) has a circular passage hole (21) formed at an intermediate portion thereof. The method of claim 4,
Wherein the thickness of the elastic body (20) decreases from the outer edge portion toward the inner flow passage hole (21). The method of claim 5,
Wherein the elastic body (20) is bent rearward of the suction port (11) toward the inner channel hole (21) at an outer edge portion thereof. The method according to any one of claims 4 to 6,
Wherein a plurality of the elastic bodies (20) are provided in the suction port (11), and the sizes of the flow holes (21) formed in the plurality of elastic bodies (20) are sequentially reduced. The method according to any one of claims 4 to 6,
A plurality of the elastic bodies 20 are provided in the suction port 11 and the respective channel holes 21 formed in the plurality of elastic bodies 20 are spaced at different distances radially outward from the center of the elastic body 20 And the suction pulsation reducing device of the compressor. The method according to any one of claims 4 to 6,
Wherein a plurality of the elastic bodies (20) are provided in the suction port (11), and the thickness of the plurality of elastic bodies (20) is different from each other so that damping can be performed over the entire operating range of the compressor Abatement device.

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