WO2020106052A1

WO2020106052A1 - Compressor including cylinder block

Info

Publication number: WO2020106052A1
Application number: PCT/KR2019/015912
Authority: WO
Inventors: 이기연; 이종목
Original assignee: 엘지전자 주식회사
Priority date: 2018-11-21
Filing date: 2019-11-20
Publication date: 2020-05-28
Also published as: KR20200059555A

Abstract

The present invention relates to a compressor and, specifically, to a compressor including a cylinder block, the compressor being capable of minimizing the deformation of a cylinder. The present invention relates to the compressor including a cylinder block, wherein the cylinder block can comprise: a shaft support part for supporting a rotary shaft of the compressor; a support positioned at the peripheral side of the shaft support part; a cylinder part positioned at one side of the support so as to form a cylindrical inner space; a fastening hole formed in the direction parallel to the inner space on the outer side of the inner space; a cylinder cover coupled to the cylinder part by means of a fastening bolt coupled to the fastening hole; and a deformation-preventing part positioned between the inner space and the fastening hole so as to prevent or relieve deformation caused by the fastening of the fastening bolt.

Description

Compressor with cylinder block

The present invention relates to a compressor, and more particularly, to a compressor including a cylinder block capable of minimizing deformation of the cylinder.

Reciprocating compressor (Reciprocating Compressor) refers to a device that compresses the fluid in a way that sucks and compresses the fluid through the reciprocating motion of the piston in the cylinder.

Such reciprocating compressors include reciprocating elements such as pistons, connecting rods, crank pins, and elements that convert the rotational force of the motor into reciprocating motion of the piston, for example, an eccentric portion provided on the rotating shaft. These reciprocating elements or reciprocating elements are mounted on the cylinder block.

In the cylinder-shaped inner space of the reciprocating compressor, the refrigerant is compressed according to the movement of the piston to form a pressure that is several to several tens of times higher than the suction pressure (external pressure of the cylinder).

At this time, due to the difference in pressure (high pressure) between the cylinder peripheral portion (low pressure) and the interior space, leakage of compressed refrigerant may occur due to the gap between the cylinder and the piston gap and the assembled valve parts.

To prevent this, assemble the gasket between the parts in the front of the cylinder. The gasket must be compressed with a suitable force to prevent leakage of high pressure gas, which is determined by the bolting force of the cylinder cover.

Therefore, the bolt of the cylinder cover should be fastened with a force strong enough to prevent leakage of refrigerant, but this force causes deformation of the cylinder portion or the cylinder inner space, distorting the cylindrical shape of the cylinder inner space and friction with the piston It may cause an increase in loss.

Therefore, there is a need for a method capable of preventing deformation of the cylinder portion while engaging the cylinder cover with a sufficiently strong force to prevent leakage of the refrigerant.

The technical problem to be achieved by the present invention is to provide a compressor including a cylinder block capable of preventing or alleviating cylinder deformation occurring during bolt fastening for fastening the cylinder cover.

In addition, the present invention, by separating the deformation portion of the cylinder block generated by the bolt clamping force from the interior space of the cylinder, to provide a compressor including a cylinder block that can prevent the coupling deformation fundamentally.

In addition, the present invention is to provide a compressor including a cylinder block that can effectively prevent the cylinder bending deformation that may occur when the cylinder portion is separated from the bolted portion.

The present invention can provide a structure for forming a slit between a cylinder and a bolt hole of a cylinder block of a compressor to prevent deformation of a cylinder that occurs when fastening a cylinder block, for example, when fastening a bolt.

To this end, the present invention may be configured to include a fastening hole formed in a direction parallel to the inner space and an slit formed between the inner space and the fastening hole in the cylinder portion outside the inner space of the cylinder portion.

Specifically, according to the present invention, when the cylinder block is fastened by using a bolt, the deformation of the cylinder block generated by the bolt fastening force can be prevented by separating the cylinder from the cylinder, and when the cylinder is separated from the bolt fastening part, It is possible to provide a structure that can effectively prevent the bending deformation of the cylinder. In addition, the present invention can be applied regardless of the presence or absence of a tapered shape of the cylinder.

As a first aspect of the present invention for achieving the above technical problem, the present invention provides a compressor including a cylinder block, wherein the cylinder block comprises: a shaft support unit supporting a rotating shaft of the compressor; A support located on the peripheral side of the shaft support; A cylinder portion located on one side of the support to form a cylindrical inner space; A fastening hole formed outside the inner space in a direction parallel to the inner space; A cylinder cover coupled to the cylinder portion through a fastening bolt coupled to the fastening hole; And a deformation preventing portion positioned between the inner space and the coupling hole to prevent or mitigate deformation due to tightening of the coupling bolt.

In addition, the deformation preventing portion may be symmetrically located on both sides of the interior space.

In addition, the deformation preventing portion may include a slit formed between the inner space of the cylinder portion and the fastening hole.

In addition, the slit may be formed to a certain depth from the outer surface of the cylinder portion.

In addition, the slit may be formed to a certain depth from the surface of the cylinder cover is coupled to the cylinder.

In addition, the slit may be formed to a certain depth from the upper surface of the cylinder portion.

In addition, the depth of the slit may be shallower than the depth of the fastening hole.

In addition, the slit may be located parallel to both sides of the inner space of the cylinder portion.

In addition, the fastening holes may be located one on each side of the inner space.

As a second aspect of the present invention for achieving the above technical problem, the present invention provides a compressor including a cylinder block, wherein the cylinder block comprises: a shaft support unit supporting a rotating shaft of the compressor; A support located on the peripheral side of the shaft support; A cylinder portion located on one side of the support to form a cylindrical inner space; A fastening hole formed outside the inner space in a direction parallel to the inner space; And it may be configured to include a slit formed between the inner space of the cylinder portion and the fastening hole.

In addition, further comprising a cylinder cover coupled to the cylinder through a fastening bolt coupled to the fastening hole, the slit can prevent or mitigate deformation caused by tightening of the fastening bolt.

According to the present invention has the following effects.

First, according to an embodiment of the present invention, by forming a slit between the inner space of the cylinder of the cylinder block and the fastening hole, it is possible to prevent or alleviate the deformation of the cylinder that occurs when the bolt is fastened.

According to this embodiment of the present invention, by separating the deformation portion of the cylinder block generated by the bolt fastening force from the interior space of the cylinder, it is possible to prevent the fastening deformation at the source.

Moreover, according to the embodiment of the present invention, it is possible to effectively prevent the cylinder bending deformation that may occur when the cylinder portion is separated from the bolted portion. In addition, the present invention can be applied regardless of whether or not the cylinder is tapered.

Accordingly, it is possible to expect an effect of reducing leakage and improving friction loss through reducing the cylinder-piston gap.

Furthermore, the present invention has additional technical effects not mentioned herein, and those skilled in the art can understand the prior art of the specification and drawings.

1 is a cross-sectional view showing a compressor including a cylinder block according to an embodiment of the present invention.

2 is a plan view showing a compressor including a cylinder block according to an embodiment of the present invention.

3 is a plan view showing a compressor including a cylinder block according to an embodiment of the present invention.

4 is a view showing a cylinder fastening part of a compressor including a cylinder block according to an embodiment of the present invention.

5 is a plan view showing a cylinder portion of a compressor including a cylinder block according to an embodiment of the present invention.

6 is a cross-sectional view taken along line B-B 'in FIG. 4.

7 is a view showing a state in which a cylinder cover of a compressor including a cylinder block according to an embodiment of the present invention is installed.

8 is a cross-sectional view taken along line D-D 'in FIG. 7.

9 is a perspective view showing a state in which a cylinder cover of a compressor including a cylinder block according to an embodiment of the present invention is installed.

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

While the invention allows for various modifications and variations, specific embodiments thereof are illustrated and illustrated in the drawings, which will be described in detail below. However, it is not intended to limit the invention to the particular forms disclosed, but rather the invention includes all modifications, equivalents, and substitutes consistent with the spirit of the invention as defined by the claims.

When an element, such as a layer, region, or substrate, is referred to as being “on” another component, it will be understood that it may be directly on another element or intermediate elements may be present therebetween. .

Although the terms first, second, etc. can be used to describe various elements, components, regions, layers and / or regions, these elements, components, regions, layers and / or regions It will be understood that it should not be limited by these terms.

Referring to FIG. 1, the compressor 100 includes a cylinder block 300 including a casing 200 having an enclosed inner space and an inner space 351 of a cylindrical shape installed in the casing 200. It may include.

The casing 200 may be formed by combining an upper shell 210 and a lower shell 220. The upper shell 210 and the lower shell 220 may be combined to be closed to each other.

In this compressor 100 structure, the casing 200 seals the inside of the compressor 100 to create a refrigerant atmosphere and forms an outer structure that prevents external air contact.

The cylinder block 300 may include a shaft support 380 on which a rotation shaft (crank shaft) 113 is supported. The cylinder block 300 may include

cylinder parts

310 and 330 forming the cylindrical inner space 321. In addition, the cylinder block 300 may include a support 370 positioned outside the shaft support 380. The cylinder block 300 will be described later in detail.

The shaft support part 380 may be installed such that the rotation shaft 113 is rotatable. The eccentric portion 150 is located on the upper side of the rotation shaft 113 to convert the rotational motion into a reciprocating motion.

That is, the eccentric portion 150 is provided with a piston 116 by a connecting rod 115, and the piston 116 can reciprocate within the cylindrical inner space 321.

A motor 120 for transmitting rotational force to the rotating shaft 113 may be installed below the cylinder block 300.

One side of the cylinder block 111, for example, the lower side may be provided with a motor unit 120 for transmitting the rotational force to the rotating shaft 113.

The motor unit 120 may include a rotor (121) installed on the side of the shaft support 380 and a stator (122) located outside the rotor (121). That is, such a motor unit 120 may form an inner rotor structure. However, the motor unit 120 is not limited to the inner rotor structure, and in some cases, may form an outer rotor structure in which the rotor is located outside.

A coil may be wound on the stator 122 of the motor unit 120 to generate magnetic force. The rotor 122 may rotate by the electromagnetic force generated by the stator 121 and the coil.

Meanwhile, an oil supply unit 140 for supplying oil in the cylindrical inner space 321 may be provided below the rotating shaft 113.

The casing 200 may include a support 130 supporting the structure constituting the compressor 100. That is, the support unit 130 may support the structure constituting the compressor 100 with respect to the casing 200.

Meanwhile, a pipe 180 connected to the cylindrical inner space 321 and through which the refrigerant compressed in the inner space 321 is discharged may be further provided.

In addition, the low-pressure refrigerant is located in the flow path to be sucked into the interior space 321, a suction muffler 118 designed in consideration of sound transmission characteristics for noise reduction may be provided.

As mentioned above, the cylinder block 300 includes a cylindrical inner space 321 through which the piston 116 reciprocates to compress fluid such as refrigerant, and the piston 116 also reciprocates. It may include a shaft support portion 380 is supported to rotate the rotating shaft 113 to rotate.

In addition, the cylinder cover (320, 340) is located outside the cylindrical inner space (321), the cylinder cover (320, 340), while covering the cylindrical inner space (321), the compressed fluid temporarily gathers Space (not shown).

The cylinder block 300 serves to support the main moving part of the compressor while providing a compression space.

2 is a plan view showing a compressor including a cylinder block according to an embodiment of the present invention. Figure 2 shows the internal structure of the compressor with the upper shell 210 of the compressor removed.

Referring to FIG. 2, a fluid of low pressure (L), for example, a refrigerant flows into a compressor, and at this time, a cylindrical inner space 321 (FIG. 1) formed by the cylinder 310 of the cylinder block 300. See).

At this time, the refrigerant introduced into the cylindrical inner space 321 may be compressed by the reciprocating motion of the piston 116.

The refrigerant compressed in the cylindrical inner space 321 may first move to the noise chamber 360 through the cylinder cover 320. As such, the compressed refrigerant may be discharged in a high pressure (H) state through the pipe 180 after the noise caused by the piston movement is reduced while passing through the two noise chambers 360.

Since the cylinder part 310 and the cylinder cover 320 form a compression space of a substantial refrigerant, it may be advantageous for the cylinder part 310 and the cylinder cover 320 to be firmly coupled by forming a cylinder fastening part 301. have.

At this time, the cylinder portion 310 and the cylinder cover 320 may be coupled to each other by a fastening bolt 322. These fastening bolts 322 may be installed in four places, and it may be necessary to assemble the cylinder cover 320 with a sufficiently strong strength to the cylinder part 310.

3 is a plan view showing a compressor including a cylinder block according to an embodiment of the present invention. Figure 3 shows the internal structure of the compressor with the upper shell 210 of the compressor removed.

Referring to FIG. 3, a fluid of low pressure (L), for example, a refrigerant flows into a compressor, and at this time, a cylindrical inner space 321 (FIG. 1) formed by the cylinder part 330 of the cylinder block 300. See).

The refrigerant compressed in the cylindrical inner space 321 may first move to the noise chamber 360 through the cylinder cover 340. As such, the compressed refrigerant may be discharged in a high pressure (H) state through the pipe 180 after the noise caused by the piston movement is reduced while passing through the two noise chambers 360.

As described above, since the cylinder part 330 and the cylinder cover 340 form a compression space of a substantial refrigerant, the cylinder part 330 and the cylinder cover 340 form a cylinder fastening part 301 to securely It can be advantageous to combine.

At this time, the cylinder portion 330 and the cylinder cover 340 may be coupled to each other by a fastening bolt 341 (see FIG. 7).

In the cylinder-shaped inner space 321 of the reciprocating compressor, the refrigerant is compressed according to the movement of the piston, so that a pressure of several to several tens of times higher than the suction pressure (external pressure of the cylinder) is formed.

At this time, due to the difference in pressure (high pressure) between the cylinder periphery (low pressure) and the interior space 321, leakage of compressed refrigerant may occur due to the gap between the cylinder and the piston gap and the assembled valve parts.

To prevent this, assemble the gasket between the parts in the front of the cylinder. The gasket must be compressed with an appropriate force to prevent leakage of high pressure gas, and this compression force is determined by the fastening force of the fastening bolt 341.

Therefore, the fastening bolt 341 of the cylinder cover 340 should be fastened with a strong force such that no leakage of refrigerant occurs, but this force causes deformation of the cylinder portion 330 or the cylinder inner space 321 The cylindrical shape of the cylindrical inner space 321 may be distorted to increase friction loss with the piston.

In order to prevent this phenomenon, in the embodiment of the present invention, a deformation preventing portion 331 formed in the cylinder portion 330 to prevent or mitigate deformation due to tightening of the fastening bolt 341 may be configured.

As a specific example, the deformation preventing part 331 may include a slit 331 formed outside the inner space 321 of the cylinder part 330.

4 is a view showing a cylinder fastening part of a compressor including a cylinder block according to an embodiment of the present invention. FIG. 4 mainly shows a state viewed from the direction A in FIG. 3.

4, the shape of the cylinder portion 330 is mainly shown. As illustrated, a fastening hole 332 formed in a direction parallel to the cylinder shape of the inner space 321 may be formed outside the inner space 321. Here, the inner space 321 may be formed by the cylindrical portion 333. The cylindrical portion 333 forming the inner space 321 may be referred to as a cylinder.

The cylinder cover 340 may be coupled to the fastening hole 332 by a fastening bolt 341.

In addition, a deformation preventing part 331 may be provided between the cylindrical inner space 321 and the fastening hole 332. As described above, the deformation preventing portion 331 may include a pair of slits 331. That is, the slit 331 may be an example of implementation of the deformation preventing unit 331. Hereinafter, the deformation preventing unit 331 will be described as the same component as the slit 331.

The deformation preventing portion 331 may prevent or mitigate deformation caused by tightening the fastening bolt 341. That is, when the cylinder cover 340 is strongly coupled to the fastening hole 332 through the fastening bolt 341, the deformation preventing unit 331 can prevent or mitigate deformation of the cylindrical inner space 321. have.

Referring to FIG. 4, the deformation preventing unit 331 may be symmetrically positioned on both sides with respect to the inner space 321. In addition, the deformation preventing portion 331 may be located between the inner space 321 of the cylinder portion and the fastening hole 332.

When the deformation preventing portion 331 is implemented as a slit 331, the slit 331 may be formed to a certain depth from the outer surface of the cylinder portion 330. That is, the slit 331 may be formed to have a certain depth from the upper side of the cylinder portion 330.

As shown in FIG. 4, when viewed from the direction of the cylinder portion 330 where the inner space 321 is visible, it can be seen that the slit 331 is formed in a vertical shape on the outer surface of the cylinder portion 330.

In addition, the fastening holes 332 may be located one on each side of the inner space 321. That is, by the action of the slit 331, the surface pressure due to the fastening of the fastening bolt 341 can be increased than when there is no slit 331, and the same or more surface pressure can be maintained even at a small fastening torque.

Therefore, a small number of fastening bolts 341 and fastening holes 332 may be provided. However, the same number of fastening bolts 341 and fastening holes 332 may be provided regardless of whether the slits 331 are present.

5 is a plan view showing a cylinder portion of a compressor including a cylinder block according to an embodiment of the present invention. 6 is a sectional view taken along line B-B 'in FIG. 4.

Referring to FIG. 5, when the deformation preventing portion 331 is implemented as the slit 331, the slit 331 may be formed to a certain depth from the surface where the cylinder cover 340 of the cylinder portion 330 is coupled. .

At this time, a portion defined by a portion other than the depth of the slit 331 may be defined as a rear support portion 302. Here, if the portion where the slit 331 is present is a portion that absorbs deformation due to the fastening of the fastening bolt 341, the rear support 302 does not have the slit 331, and the action of the slit 331 By this, it can be considered that the deformation does not occur even when the fastening force of the fastening bolt 341 is applied, so that the cylinder part 330 is firmly supported.

In addition, the fastening hole 332 may be formed in a direction parallel to the cylinder shape of the inner space 321 from the outside of the inner space 321.

At this time, the depth of the slit 331 may be shallower than the depth of the fastening hole 332. At this time, the depth of the slit 331 may be shallower than the depth C of the cylindrical portion 333 constituting the cylindrical inner space 321. At this time, the depth of the slit 331 may have a depth of 0.1 to 0.95 times the length of the cylindrical portion 333.

In addition, the width of the slit 331 may have a width of 0.1 to 3 times the diameter of the fastening hole 332.

In addition, the slits 331 may be located parallel to both sides of the inner space 321 of the cylinder portion 330.

7 is a view showing a state in which a cylinder cover of a compressor including a cylinder block according to an embodiment of the present invention is installed. 8 is a sectional view taken along line D-D 'in FIG. 7.

Referring to FIG. 7, the cylinder cover 340 is illustrated by a fastening bolt 341. At this time, the slit 331 is positioned between the fastening bolt 341 and the cylindrical inner space 321.

As described above, the cylinder cover 340 may be fixed by two fastening bolts 341 located on both sides of the inner space 321.

Referring to FIG. 8, it can be seen that the fastening bolt 341 is coupled to the fastening hole 332 with a predetermined length. At this time, the combined depth of the fastening bolt 341 may be shallower than the depth of the slit 332.

At this time, the valve plate 350 and the gasket 351 may be located between the cylinder cover 340 and the cylinder portion 330.

The gasket 351 may help maintain the airtightness of the cylindrical inner space 321.

9, the shape of the gasket 351 is shown. As such, the outer shape of the gasket 351 may be circular.

Indeed, when implementing and comparing the embodiment according to FIG. 2 and the embodiments described with reference to FIGS. 3 to 9 described above, the tightening torque is reduced from 80 kgf.cm in the case of FIG. 2 to 60 kgf.cm in the case of FIGS. Even in this case, it can be seen that the surface pressure can show the same level and the deformation of the cylinder decreases from 4 μm to 1.5 μm.

At this time, as shown, the number of fastening bolts can also be reduced from four to two.

As described above, according to the present invention, by forming the slit 331 between the cylinder inner space 321 of the cylinder block 300 and the fastening hole 332, it is possible to prevent or alleviate the deformation of the cylinder that occurs when the bolt is fastened. have.

According to this embodiment of the present invention, by separating the deformation portion of the cylinder block 300 generated by the bolt fastening force from the cylinder inner space 321, it is possible to prevent the fastening deformation at the source.

Moreover, according to an embodiment of the present invention, it is possible to effectively prevent the cylinder bending deformation that may occur when the cylinder portion 330 is separated from the bolt fastening portion. In addition, the present invention can be applied regardless of whether or not the cylinder is tapered.

As described above, as the slit 331 spatially separates the cylinder inner space 321 and the fastening hole 332, which are important for leakage and friction loss, deformation occurring in the periphery of the fastening hole 332 is the cylinder inner space 321. ).

In addition, it is possible to prevent bending deformation of the cylinder, which occurs when the fastening hole 332 and the cylinder space 321 are separated. This is because the slit 331 is formed to a certain depth, the rear of the cylinder portion 330 is connected to its peripheral portion to increase the rigidity to prevent cylinder bending. That is, there is no slit 331 at the rear of the cylinder, and a rear support area 302 that is integrally connected with the peripheral portion to prevent bending deformation of the cylinder due to the fastening force of the fastening bolt 341 exists.

As a result, the piston-cylinder friction loss caused by cylinder deformation can be reduced to increase mechanical efficiency, and by preventing the deformation of the cylinder, the gap between the cylinder and piston is reduced, thereby reducing the leakage of compressed refrigerant generated in the cylinder and compressing efficiency. Can increase.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented as specific examples for ease of understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art to which the present invention pertains that other modified examples based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

According to the present invention, a compressor including a cylinder block capable of preventing or alleviating cylinder deformation can be provided.

Claims

In the compressor comprising a cylinder block, the cylinder block,

A shaft support portion supporting a rotating shaft of the compressor;

A support located on the peripheral side of the shaft support;

A cylinder portion located on one side of the support to form a cylindrical inner space;

A fastening hole formed outside the inner space in a direction parallel to the inner space;

A cylinder cover coupled to the cylinder portion through a fastening bolt coupled to the fastening hole; And

Compressor comprising a cylinder block, characterized in that it comprises a deformation preventing portion that is located between the inner space and the fastening hole to prevent or mitigate deformation caused by tightening of the fastening bolt.
According to claim 1, wherein the deformation prevention unit,

Compressor comprising a cylinder block, characterized in that located symmetrically on both sides with respect to the interior space.
According to claim 1, wherein the deformation prevention unit,

Compressor comprising a cylinder block, characterized in that it comprises a slit formed between the inner space of the cylinder portion and the fastening hole.
The compressor of claim 3, wherein the slit is formed at a predetermined depth from an outer surface of the cylinder portion.
The compressor of claim 4, wherein the slit is formed at a predetermined depth from a surface where the cylinder cover of the cylinder portion is coupled.
The compressor according to claim 4, wherein the slit is formed at a predetermined depth from an upper surface of the cylinder portion.
The compressor of claim 3, wherein the depth of the slit is shallower than the depth of the fastening hole.
The compressor of claim 3, wherein the slit is located parallel to both sides of the inner space of the cylinder portion.
The compressor according to claim 1, wherein the fastening holes are located one on each side of the inner space.
In the compressor comprising a cylinder block, the cylinder block,

A shaft support portion supporting a rotating shaft of the compressor;

A support located on the peripheral side of the shaft support;

A cylinder portion located on one side of the support to form a cylindrical inner space;

A fastening hole formed outside the inner space in a direction parallel to the inner space; And

Compressor comprising a cylinder block, characterized in that it comprises a slit formed between the inner space of the cylinder portion and the fastening hole.
The cylinder of claim 10, further comprising a cylinder cover coupled to the cylinder part through a fastening bolt coupled to the fastening hole, wherein the slit prevents or mitigates deformation caused by tightening of the fastening bolt. Compressor comprising a block.
11. The compressor of claim 10, wherein the slit is located parallel to both sides of the inner space of the cylinder portion.
11. The compressor of claim 10, wherein the slit is formed to a predetermined depth from the outer surface of the cylinder portion.
The compressor of claim 10, wherein the slit is formed at a predetermined depth from a surface where the cylinder cover of the cylinder portion is coupled.
11. The compressor of claim 10, wherein the slit is located parallel to both sides of the inner space of the cylinder portion.