CN1106516C - Piston support apparatus for linear compressor - Google Patents

Abstract

A piston supporting device of a linear compressor, which can prevent the friction loss between the cylinder and the piston of the linear compressor by supporting the reciprocating piston in the cylinder more stably, and improve its efficiency and reliability. The device includes a cylinder, a spring support, a plurality of second piston springs and a piston. The above plurality of second piston springs includes a plurality of first piston springs having a predetermined rigidity in a diagonal direction thereof and fixed to the spring support.

Description

The piston support apparatus of Linearkompressor

Technical field

The present invention relates to a kind of piston support apparatus of Linearkompressor, a kind of improved piston support apparatus of Linearkompressor particularly, this device can prevent the frictional loss between the cylinder and piston of Linearkompressor, like this, by more stably supporting piston is reciprocating in this cylinder, thereby improve the efficient of Linearkompressor and the reliability of system.

Background of related

Fig. 1 is the cross-sectional view of the existing Linearkompressor structure of an expression.

As shown in Figure 1, this existing Linearkompressor comprises a compressor housing 1 with sealing of reservation shape, a flange 2, a cylinder 3, the chuck of a circle 6, one linear motors of 5, one pistons " M ", 7, one of a valve assembly is used to eliminate suction noise baffler 8 and exhaust sound baffler 9 that is used to eliminate exhaust sound of suction noise.Above-mentioned flange 2 is arranged on the inside of the compressor housing 1 of sealing, apart from height that is predetermined in bottom of this compressor housing.Above-mentioned cylinder 3 is fixed on the rear portion of this flange 2.One end 5a of above-mentioned circular chuck 5 is fixed on the core of piston spring 4.Above-mentioned piston 6 is fixed on the core of chuck 5, and can be reciprocating in cylinder 3.Above-mentioned linear motor " M " is arranged in the periphery of flange 2, is used to produce predetermined driving force.Above-mentioned valve assembly 7 is arranged on the intermediate portion of flange 2.Upward air-breathing and exhaust sound baffler 8 and 9 is arranged on the both sides of valve assembly 7.

Motor " M " comprises an iron core 12 that is arranged on the inside of flange 2, and the magnet 14 of 11, one yokes 13 of a coil and a ring is arranged in iron core 12.This back yoke 13 has a gap that is predetermined with respect to the inner circumferential surface of this iron core 12.And this circular ring magnet 14 is fixed on the part of this chuck 5, and inserts in the gap that forms between this iron core 12 and this back yoke 13, can and be somebody's turn to do to-and-fro motion between the yoke of back at this iron core.

In Fig. 1, label 10 expression mounting spring, it is installed between the compressor housing 1 of piston spring 4 and sealing, is used for when piston 6 makes reciprocating motion in cylinder 3, and flexibly the supporting piston spring 4.

The work of existing Linearkompressor is described below with reference to Fig. 1 and 4B.

At first, when the Ac that will have predetermined direction feeds in the coil 11 of linear motor " M ", just on this iron core 12, produce magnetic force.So magnet 14 is just at this iron core 12, under the effect of the magnetic force that is produced between magnet 14 and the coil 11, along the indicated direction moving linearly of the arrow " A " of Fig. 1.Therefore, cooling medium gas just flows in the compression volume " S " that forms between cylinder 3 and piston 6 by above-mentioned suction noise baffler 8 and valve assembly 7.

In addition, when Ac flows in the coil 11 of this linear motor " M " with opposite direction, according to above-mentioned same principle, this magnet 14 and piston 6 be just along the indicated direction moving linearly of arrow " B ", and be compressed in the cooling medium in this compression volume " S ".Cooling medium gas through overcompression is disposed to exhaust sound baffler 9 by this assembly 7.

Secondly, be used in piston Supporting structure in the existing Linearkompressor with reference to description of drawings.

At first, make a groove 6A at the intermediate portion of piston 6 with predetermined depth.For the load (power) that will act on effectively on the piston is divided into load (power) F1 and F2, thereby make this piston 6 in cylinder when reciprocating, it is minimum that frictional loss reduces to, and this piston 6 is divided into supporting portion 6C behind a preceding supporting portion 6B and with respect to groove 6A.

Below, the structure and the work of the spring-loaded part 15 of supporting piston spring 4 of above-mentioned chuck 5 and supporting piston spring 4 usefulness are described.

Shown in Fig. 2 and 3, at the core of piston spring 4 an attachment hole 4A is arranged, be used for above-mentioned chuck 5 is fixed on piston spring 4.Four yielding support 4B shape in the shape of a spiral stretch out from this attachment hole 4A, and form a fixed hole 4C on each end portion of these four yielding support 4B, are used for piston spring 4 is fixed on this spring-loaded part 15.In addition, each side in spring-loaded part 15 has one to fix boss 15A.The number of this fixing lug boss 15A and structure height are identical with fixed hole 4C in the end portion of the yielding support 4B of piston spring 4.

After the corresponding boss among the fixing lug boss 15A of fixed hole 4C and spring-loaded part 15 is aimed at, set screw 16 is inserted among the fixed hole 4C of piston springs 4, piston spring 4 is fixed on the spring-loaded part 15 by fixing lug boss 15A.

Yet because the piston support apparatus of existing Linearkompressor has preceding supporting portion 6B and the back supporting portion 6C that forms on this piston 6, and these two supporting portion 6B contact with the inner circumferential surface of this cylinder with 6C simultaneously.Therefore, when piston 6 is reciprocating in cylinder 3, on preceding supporting portion 6B and back supporting portion 6C, all to produce frictional loss, so just reduce the efficient of this device.

In addition, when being fixed on piston spring 4 on the spring-loaded part 15, because finishing of fixation procedure will be at the fixed hole 4C that makes this piston spring 4 with after the fixing lug boss 15A of spring-loaded part 15 aims at, again with in the corresponding hole among the fixed hole 4C of set screw 16 insertion piston springs 4, piston spring 4 could be fixed on the spring-loaded part 15 then, so the fixation procedure of spring is very complicated.In addition, when set screw 16 was loosening, piston spring 4 became can be free movable, and the result makes piston 6 not do effective to-and-fro motion in cylinder 3, has so just reduced the efficient of Linearkompressor.

Summary of the invention

Therefore, individual purpose of the present invention one provides a kind of piston support apparatus of Linearkompressor, and this device can solve the problem that runs in the prior art.

Another object of the present invention provides a kind of improved piston support apparatus of Linearkompressor, this device can reduce the frictional loss between the cylinder and piston of Linearkompressor, like this, by more stably being bearing in piston reciprocating in the cylinder, the efficient of Linearkompressor and the reliability of device have been improved.

In order to reach above purpose, according to the first embodiment of the present invention, provide a kind of piston support apparatus of Linearkompressor, this device comprises: a cylinder, a spring support, many second piston springs and a piston.Above-mentioned cylinder is arranged on the compressor of sealing.Above-mentioned spring support is arranged on that relative with cylinder in the compressor housing of sealing part.Above-mentioned these many second piston springs have many first piston springs, and these many first piston springs have predetermined strength on its diagonal, and are fixed on the above-mentioned spring support.One end of above-mentioned piston inserts in above-mentioned first and second piston springs, and its other end has a supporting portion that contacts with the internal surface of above-mentioned cylinder.

In order to reach above purpose, according to a second embodiment of the present invention, provide a kind of piston support apparatus of Linearkompressor, this device comprises a cylinder, a spring support, many piston springs and a piston.Above-mentioned cylinder is arranged on the compressor of sealing.Above-mentioned spring support is arranged on that relative with cylinder in the compressor housing of sealing part.Above-mentioned many piston springs have predetermined strength on its diagonal, and are fixed on the above-mentioned spring support.One end of above-mentioned piston inserts in the piston spring, and its other end has a supporting portion that contacts with the internal surface of cylinder.

Other advantages of the present invention, purpose and characteristics will be clearer from following explanation.

Description of drawings

Present invention will become more fully understood from detailed description given below and accompanying drawing.Accompanying drawing is just in order to illustrate the present invention, rather than in order to limit the present invention.In the accompanying drawing:

Fig. 1 is the cross sections figure of the structure of existing Linearkompressor;

Fig. 2 is the schematic cross section of the piston support apparatus structure of existing Linearkompressor;

Fig. 3 is the plan view of the piston spring of existing piston bearing device;

Fig. 4 A and 4B are the figure of the spring support of existing piston bearing device, wherein:

Fig. 4 A is the plan view of this spring support;

Fig. 4 B is the sectional view along IV-IVB ' line of Fig. 4 A;

Fig. 5 is the cross-sectional view according to the piston support apparatus of Linearkompressor of the present invention;

Fig. 6 is the plan view according to the piston spring of piston support apparatus of the present invention;

Fig. 7 A and 7B are the figure according to the spring support of piston support apparatus of the present invention, wherein:

Fig. 7 A is the plan view of this spring support;

Fig. 7 B is the sectional view along the VIIb-VIIb ' of Fig. 7 A;

Fig. 8 is the schematic cross section of piston support apparatus according to another embodiment of the invention;

Fig. 9 A and 9B are the views of the piston spring of piston support apparatus according to still another embodiment of the invention, wherein:

Fig. 9 A is the plan view of this piston spring;

Fig. 9 B is the side view of this piston spring;

Figure 10 and 11 is for being used to illustrate the figure according to the principle of piston support apparatus of the present invention.

Describe in detail

Fig. 5 is the cross-sectional view according to the piston support apparatus of Linearkompressor of the present invention, and Fig. 6 is the plan view according to the piston spring of piston support apparatus of the present invention, Fig. 7 A and 7B are the views according to the spring support of piston support apparatus of the present invention, wherein, Fig. 7 A is the plan view of this spring support, and Fig. 7 B is the sectional view along VIIb-VIIb ' line of Fig. 7 A.

As shown in the figure, piston support apparatus according to Linearkompressor of the present invention comprises a cylinder 21, a spring support 22, many first piston spring 23A that make by high-strength material, many second piston spring 23B, a supporting member 23C, 25, one ring chucks 24 of a piston and a circular ring magnet 14.Above-mentioned cylinder 21 is installed in the part of seal casinghousing (not shown) inside.Above-mentioned spring support 22 is installed in the seal casinghousing, and spaced apart with cylinder 21.Above-mentioned many second piston spring 23B are fixed on a side of spring support 22.Above-mentioned supporting member 23C passes first and second piston spring 23A and the 23B.Above-mentioned piston 25 is fixed on the supporting member 23C, and has supporting portion 25A to insert in the cylinder 21.Above-mentioned ring chuck 24 is made integral body with piston 25, and above-mentioned circular ring magnet 14 then stretches out from a side of chuck 24.

The shape of the existing piston spring 4 that the shape of the above-mentioned second piston spring 23B is common and shown in Figure 3 is identical.As shown in Figure 6, the first piston spring 23A that is made by high-strength material comprises reinforcing section a 23 ' A, and this reinforcing section 23 ' A forms on the outer edge part of first piston spring 23A.Many the fixed hole 23 ' B that separate each other are arranged on this reinforcing section 23 ' A.In addition, on first piston spring 23A, also have four spirality elastic part 23 ' D.These four spirality elastic part 23 ' D are connected on reinforcing section 23 ' A and become as a whole.

In addition, shown in Fig. 7 A and 7B, many screw connecting hole 22A are arranged on spring support 22.Here, the number of screw connecting hole 22A and position are the same with number and the position of fixed hole 23 ' B of above-mentioned first piston spring 23A.Core at spring support 22 has a hole 22B, is used to hold above-mentioned first and second piston spring 23A and the 23B.

When being fixed on the first and second piston spring 23A and 23B on the spring support 22, the first and second piston spring 23A and 23B be inserted among the hole 22B on the spring support 22.After this, fixed hole 23 ' B on the first and second piston spring 23A and the 23B is aimed at screw connecting hole 22A on the spring support 22, then, set screw 26 is inserted among fixed hole 23 ' B of the first and second piston spring 23A and 23B, like this, just the first and second piston spring 23A and 23B have been fixed on the spring support 22.

As mentioned above, in piston support apparatus according to Linearkompressor of the present invention, because reinforcing section 23 ' A has been arranged on the outer edge part of first piston spring 23A, and there are many first and second piston spring 23A and 23B to be fixed on the spring support 22, therefore, more effectively distributional effects is at the power F1 on the supporting portion 25 ' A of piston 25 with act on power F2 on the first piston spring 23A, and more stably supporting piston 25.

That is, the reinforcing section 23 ' A of the circle of first piston spring 23A can more effectively support above-mentioned power F ₂

Fig. 8 is the schematic cross section of piston support apparatus according to another embodiment of the invention, Fig. 9 A and 9B are the views of the piston spring of piston support apparatus according to another embodiment of the invention, wherein, Fig. 9 A is the plan view of this piston spring, and Fig. 9 B is the side view of this piston spring.

In the piston support apparatus structure of according to another embodiment of the present invention Linearkompressor, have only the structure of piston spring 33 different with the piston spring bearing device of existing Linearkompressor.

Therefore, the piston support apparatus of Linearkompressor according to another embodiment of the invention is described below with reference to this different structure.

That is, the structure of piston spring 33 of the present invention is identical with the profile of existing piston spring 4, still, will decide according to following condition according to the flexibly mounted thickness " t " and the width " w " of this piston support apparatus of Linearkompressor of the present invention.

That is, for increasing the intensity of piston spring 33, the ratio of thickness of elastic part " t " and minimum width " w " will surpass 1: 3, so that the radial strength of piston spring 33 increases.

The following describes when the ratio of the thickness " t " of the elastic part of piston spring 33 and minimum width " w " surpasses 1: 3 the reason that the intensity of piston spring 33 increases.

Figure 10 and 11 is the figure that are used to illustrate according to the principle of piston support apparatus of the present invention.

As shown in the figure, the elastic part 33B that supposes this piston spring 33 is an overhang, when power " p " acts on the end of this overhang, has produced an amount of deflection according to following equation " δ " at this place, end $\mathrm{\&delta;}=\frac{{\mathrm{<figure-callout\; id="3"\; label="Fl"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">Fl</figure-callout>}}^3}{\mathrm{EI}}f\left(x\right)----\left(1\right)$

In the formula: E represents the Young's modulus of this overhang, and I represents the second moment of the cross section of this overhang, and l represents the length of this overhang.

In addition, according to Hooke (Hook) law, can draw following equation. $X=\frac{F}{K}----\left(2\right)$ Intensity " K " in equation (1) and (2) can be represented by following formula: $K=\frac{\mathrm{<figure-callout\; id="3"\; label="EI\; l"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">EI</figure-callout>}}{l^{}}=\frac{E\&CenterDot;\frac{{\mathrm{<figure-callout\; id="3"\; label="wt"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">wt</figure-callout>}}^3}{12}}{{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">l</figure-callout>}}^3}$

K∝WT ³ (3) $\frac{K_1}{K_2}\&Proportional;\frac{{\mathrm{<figure-callout\; id="3"\; label="tw"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">tw</figure-callout>}}^3}{{\mathrm{<figure-callout\; id="3"\; label="wt"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">wt</figure-callout>}}^3}\&Proportional;{\left(\frac{w}{t}\right)}^2$ $K_1\&Proportional;K_2{\left(\frac{w}{t}\right)}^2$

Therefore, intensity is according to the thickness of elastic part 33B " t ", rather than decide according to the width " w " of elastic part 33B.That is, the axial direction intensity of this piston spring 33 can be expressed as follows by following formula with the ratio of diagonal intensity. $\frac{K_1}{K_2}\&ap;\frac{{\mathrm{<figure-callout\; id="3"\; label="tw"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">tw</figure-callout>}}^3}{{\mathrm{<figure-callout\; id="3"\; label="wt"\; filenames="C9611426900111.png"\; state="\{\{state\}\}">wt</figure-callout>}}^3}\&ap;\frac{w}{t}$ $K_1\&ap;K_2\frac{w}{t}$

As mentioned above, basic purpose according to the piston support apparatus of Linearkompressor of the present invention is to adopt on the diagonal to have high-intensity piston spring, form a supporting portion of piston, this piston contacts with the inner circumferential surface of cylinder, thereby improve the efficient of device, the loss of reducing friction, and improve the reliability of device.

Though, set forth several preferred embodiments of the present invention for illustrative purposes, yet, those skilled in the art will be understood that, can do various improvement to the present invention, increase and substitute, and the scope of the present invention and the aim that can not depart from claims to be stated.

Claims (5)

1. A piston support device for a linear compressor, comprising: a cylinder; a piston that reciprocates within the cylinder; a spring support on the portion of the cylinder opposite the piston; and a plurality of piston springs fixed on spring supports, It is characterized in that the plurality of piston springs includes a plurality of first piston springs and a plurality of second piston springs, and the strength of the first piston springs is higher than that of the second piston springs, so that the piston springs support a reciprocating direction perpendicular to the piston. The direction of motion exerts a load on the piston, one end of the piston is connected to the piston spring, and the other end of the piston includes a bearing portion that contacts the inner surface of the cylinder. 2. The device according to claim 1, wherein said first piston spring has a reinforcing portion formed on its outer edge portion and a plurality of elastic portions, and said plurality of elastic portions are helical and connected to said reinforcing portion. Partially integrated, each end of said plurality of resilient parts extends from a connection formed by the central part of said higher strength piston spring. 3. The apparatus according to claim 1, wherein a mounting hole having a predetermined depth is formed on one side of said spring support member for receiving the piston spring therein. 4. The device according to claim 1, wherein said piston spring comprises: a connecting hole formed at its central portion for accommodating one end of said piston passing therethrough; a plurality of helical elastic parts extending from the connecting part and spaced apart from each other; a fixing hole formed at the end of each resilient portion for receiving a fixing screw therethrough for fixing said piston spring on said piston support, wherein the ratio of thickness to minimum width of said piston spring is at least 1: 3. 5. The device according to claim 1, wherein the piston spring is a leaf spring.

Images