KR20100068066A - Muffler for compressor and method for manufacturing thereof - Google Patents

Abstract

PURPOSE: A muffler for a compressor and a manufacturing method thereof are provided to prevent the increasing of inhaled refrigerant by forming cases of an inhaling muffler to a dual structure and by inserting an insulating material which has a low heat transfer coefficient between the cases. CONSTITUTION: A muffler for a compressor comprises; an inner case(100) which is sealed up in order to form one or more chambers; and an outer case(200) which covers the inner case with separating with a fixed interval from the inner case. An insulating material(500) is filled in the space of the interval between the outer circumference of the inner case and the inner circumference of the outer case. The insulating material has a lower thermal conductivity than the thermal conductivity of air. The insulating material is in a solid state in an operating temperature.

Description

Muffler for compressor and manufacturing method {MUFFLER FOR COMPRESSOR AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a compressor muffler installed on the suction side of the compressor to attenuate noise. The present invention relates to a compressor muffler that forms a casing of the muffler in a dual structure and insulates the insulation therebetween to reduce heat transfer. It is about.

In general, the hermetic compressor is provided with an electric motor and a compression unit operated by the electric motor in the hermetic container. In addition, a suction muffler is installed on the suction side of the compression unit to reduce valve sound, flow noise, pressure pulsation, etc. generated when the refrigerant is sucked into the compression unit. The suction muffler is provided with a noise space to reduce the noise generated when the refrigerant is sucked. The noise space may be formed into a plurality of compartments as needed, and the plurality of noise spaces may be formed in series or in parallel as necessary.

The suction muffler may be classified into a direct suction method or an indirect suction method according to a form applied to the compressor. The suction suction muffler of the direct suction type is arranged to be intimately or integrally connected to the suction pipe through which the inlet is coupled to the sealed container of the compressor so that the refrigerant is directly sucked into the noise space. On the other hand, the indirect suction method is such that the suction pipe is spaced apart from the inlet of the suction muffler by a predetermined interval so that the refrigerant is sucked through the inner space of the sealed container of the compressor.

The conventional hermetic compressor as described above affects the temperature of the refrigerant while the internal temperature of the hermetic container rises during operation of the compressor. However, in the conventional suction muffler, as the case is generally formed as a single wall, the temperature of the refrigerant to be sucked is increased by being easily affected by the internal environment of the sealed container. There was a problem.

The present invention solves the problems of the conventional compressor suction muffler as described above, and can increase the thermal insulation effect of the suction muffler to prevent the temperature of the refrigerant being sucked even if the internal temperature of the sealed container rises. It is an object of the present invention to provide a muffler and a method of manufacturing the same.

In order to achieve the object of the present invention, at least one chamber (chamber) is sealed to form an inner case; And an outer case sealingly coupled to surround the outer case at a predetermined interval, wherein a space between the outer circumferential surface of the inner case and the inner circumferential surface of the outer case is provided with a compressor muffler.

In addition, manufacturing the inner case and the outer case; Assembling the inner case and the outer case; Injecting a liquid insulating material into a space between the outer case and the inner case through the injection hole of the outer case while the inner case and the outer case are assembled; There is provided a method of manufacturing a muffler for a compressor including a; hardening the liquid insulator to solidify.

In the compressor muffler according to the present invention, as the case of the suction muffler is formed in a double structure and a heat insulating material having a low heat transfer coefficient is inserted between the cases, the internal temperature of the compressor sealed container is moved into the noise space of the suction muffler. The transmission can be greatly reduced. Accordingly, the temperature of the refrigerant sucked into the noise space of the suction muffler may be prevented from rising, thereby greatly reducing the suction loss of the refrigerant.

In addition, the insulation is firmly supported between the inner case and the outer case to increase the reliability of the compressor as the double wall muffler maintains a stable shape.

Hereinafter, a suction muffler for a compressor according to the present invention and a manufacturing method thereof will be described in detail with reference to an embodiment shown in the accompanying drawings.

As shown in FIG. 1, the reciprocating compressor equipped with the compressor suction muffler according to the present invention includes an electric drive unit 10 installed inside the sealed container 1 to perform forward and reverse rotation, and the electric drive unit. It is provided on the upper side of the 10 is composed of a compression unit 20 for receiving the rotational force of the transmission unit 10 to compress the refrigerant.

The transmission unit 10 may be a constant speed motor or an inverter motor capable of forward rotation and reverse rotation. In addition, the transmission part 10 is supported by the frame 2 inside the hermetic container 1 and is stably installed to be elastic, and a rotor 12 rotatably installed inside the stator 11. And a crankshaft 13 coupled to the center of the rotor 12 to transmit the rotational force to the compression unit 20.

The compression unit 20 may include a cylinder 21 forming a predetermined compression space V1 and a piston for compressing a refrigerant while reciprocating radially in the compression space V1 of the cylinder 21 ( 22 and one end thereof is rotatably coupled to the piston 22, and the other end thereof is rotatably coupled to the crankshaft 13 so that the rotational movement of the transmission unit 10 may be rotated. A connecting rod 23 for converting into a linear motion, a sleeve 24 inserted between the crankshaft 13 and the connecting rod 23 and acting as a bearing, and coupled to the tip of the cylinder 21 and suctioned thereto. A valve assembly 25 having a valve and a discharge valve, a suction muffler 26 coupled to the suction side of the valve assembly 25, and a discharge cover 27 coupled to accommodate the discharge side of the valve assembly 25. ) To attenuate the discharge noise of the refrigerant discharged in communication with the discharge cover 27. It made of Ex muffler 28.

In the reciprocating compressor as described above, when power is applied to the stator 11 of the electric motor 10, the rotor 12 is crank shaft by the interaction force between the stator 11 and the rotor 12. It rotates with the (13), the connecting rod 23 eccentrically coupled to the crankshaft 13 is pivoting, and the piston 24 coupled to the connecting rod 23 is the cylinder 21 Will reciprocate in a straight line. At this time, the refrigerant is introduced into the noise space of the suction muffler 26 to attenuate the noise vibration, and the refrigerant is sucked into the compression space V1 of the cylinder 21 and compressed by the piston 22 and then discharged. Discharged to the cover 27, the refrigerant discharged to the discharge cover 27 is repeated a series of processes discharged to the refrigeration cycle via the discharge muffler (28).

Here, as the refrigerant is directly sucked into the noise space S1 of the suction muffler 26 without passing through the inner space of the sealed container 1, before the refrigerant is sucked into the compression space V1, By preventing the preheating in the internal space it can reduce the suction loss of the refrigerant, thereby improving the performance of the compressor.

In addition, when the suction muffler 26 is formed in a double wall structure, the heat insulating effect in the suction muffler 26 is doubled, so that the suction loss of the refrigerant can be more effectively reduced.

2 and 3 are a perspective view and a longitudinal sectional view showing a suction muffler of the reciprocating compressor according to the present invention.

As shown in the drawing, the suction muffler 26 has an inner case 100 in which a noise space S1 is formed to attenuate the noise generated when the refrigerant is sucked, and a predetermined outside of the inner case 100. It consists of an outer case 200 for wrapping the space (S2).

The inner case 100 includes a first inner case 110 having a suction hole as shown in FIGS. 2 and 3, and a second inner case 120 covering an upper side of the first inner case 110. Is done. An upper surface of the first inner case 100 is opened, and a lower surface of the second inner case 120 opens to open the upper surface of the first inner case 110 to form a noise space S1 together. Is formed.

As shown in FIGS. 4 and 5, the first inner case 110 and the second inner case 120 have a sealing surface 112 and 122 which are engaged with each other so as to be closely sealed to each other. Can be formed. Here, the thickness of the inner case 100 may not be thick enough to form a stepped surface. In this case, a band-shaped sealing protrusion (not shown) is formed on the joint portion of the first inner case 110 or the joint portion of the second inner case 120 on the outer circumferential surface or the inner circumferential surface, and the step surface is formed using the sealing protrusion. Can be formed. In addition, the first inner case 110 and the second outer case 120 may be put in a mold and joined by molding the joint portion by a double injection method.

The outer case 200 covers the upper surface of the first outer case 210 and the first outer case 210 as shown in FIGS. 2 and 3 to form an air layer S2 between the inner case 100 and the inner case 100. It consists of a second outer case 220 to form a seal.

An upper surface of the first outer case 210 is opened, and a lower surface of the second outer case 220 is opened to cover the opened upper surface of the first outer case 210 to form an outer circumferential surface of the inner case 100. Seals are formed at predetermined intervals.

As shown in FIG. 3, the first outer case 210 communicates with the first suction hole 113 of the first inner case 110 at a bottom of one side thereof so that the suction guide tube 300 is inserted into the second suction hole. 213 is formed. An annular first sealing groove 214 is stepped on the inner circumferential surface of the second suction hole 213 to insert the first sealing protrusion 114 to form a sealing surface.

In addition, a through hole 215 is formed in the first outer case 210 so that the oil drainage guide protrusion 116 penetrates on the other bottom surface thereof, as shown in FIG. An annular second sealing groove 216 is stepped so that the sealing protrusion 117 is inserted to form a sealing surface.

In the second outer case 220, the discharge guide part 223 is formed in a pipe shape at the center of the upper surface thereof. As shown in Figure 3, the inner circumferential surface of the discharge guide portion 223, more precisely at the corner point where the discharge guide portion 223 starts the third sealing projection 411 provided on the top of the discharge guide pipe 400 to be described later ) Is formed to step the third sealing groove 224 to a predetermined depth so as to be engaged.

In addition, the first outer case 210 and the second outer case 220, as shown in Figure 4 is to be formed stepped sealing surfaces 211, 221 are engaged with each other so that the bonding portion can be closely sealed Can be. Here, the thickness of the outer case 200 may not be thick enough to form a stepped surface. In this case, as in the inner case 100, a band-shaped sealing protrusion (not shown) is formed on the joint portion of the first outer case 210 or the joint portion of the second outer case 220 on the outer circumferential surface or the inner circumferential surface. The stepped surface can be formed using the sealing protrusion.

In addition, the first outer case 210 and the second outer case 220, as shown in Figure 4, the junction portion is sealed through a fusion operation using ultrasonic waves or the like or the first outer case 210 and the second outer By inserting the case 220 into a separate mold and injecting a molding material, the sealing part 230 may be further formed by molding through a double injection method. When the sealing portion 230 is a low flow rate of the molding liquid during molding, since the sealing portion 230 may be formed unevenly, it is preferable that the flow rate of the molding liquid is as fast as possible. However, in view of this, when the injection pressure of the molding liquid is increased, the outer case 200 may be deformed by the high injection pressure. Therefore, it is not preferable to inject the molding liquid above the proper injection pressure. Therefore, in order to inject the molding liquid at a proper injection pressure while the molding liquid flows quickly, the component of the molding liquid is preferably lower in viscosity than the outer case 200. For this purpose, when the outer case 200 is a polymer material including glass fiber, the molding liquid of the sealing portion 230 is a polymer material having a lower content of glass fiber than the molding liquid of the outer case 200. It is preferable to form. Here, the outer case 200 as well as the inner case 100 may be formed of a glass fiber or a polymer material containing glass fiber having excellent thermal insulation and excellent rigidity.

In addition, when the sealing part 230 is formed by the double injection method, since the sealing part 230 may be removed after injection, the contact surface between the sealing part 230 and the outer case 200 is preferably formed as wide as possible. desirable. To this end, as shown in FIG. 4, support protrusions 212 and 222 for supporting the sealing part 230 are respectively formed on the outer circumferential surface of the joint portion of the first outer case 210 and the second outer case 220. It may be formed evenly along the outer circumferential surface. Of course, the support protrusions 212 and 222 may be formed at a predetermined interval. Here, the support protrusions 212 and 222 may be similarly applied to the inner case 100.

In addition, as shown in FIG. 5, a separate support protrusion may not be formed at the junction of the outer case 200, and the sealing portion 230 may be formed on the outer circumferential surface thereof.

The suction guide tube 300 is formed of a flexible elastic material as shown in FIG. 3, and at one end inserted into the first suction hole 113, an inner surface of the first suction hole 113 and a first first described later will be described. The first sealing jaw 310 and the second sealing jaw 320 are protruded at predetermined intervals so as to be caught on the outer surface of the second suction hole 213 of the outer case 210.

The discharge guide pipe 400 is formed in the shape of a plurality of pipes having a predetermined diameter as shown in Figure 3, and extends in the transverse direction at the middle height of the first pipe portion 410 and the second pipe portion 420 Thus, the flange portion 430 forming a kind of baffle plate is formed to partition the noise space S1 into a plurality of chambers. The upper end of the first conduit 410 passes through the discharge hole 122 of the second inner case 120, and a sealing groove 224 provided in the discharge guide part 223 of the second outer case 220. The third sealing protrusion 411 is formed stepped so as to engage with. Here, the discharge guide pipe 400 is bent at one end of the flange portion 430 in the lower direction is supported by the first inner case 110 and the bottom of the other side of the flange portion 430 is The third sealing protrusion 411 of the upper side is supported by the first inner case 110 and is upwardly disposed in the third sealing groove 224 provided in the discharge guide part 223 of the second outer case 220. Engaged and supported. In addition, the discharge guide tube 400 may be preferably formed of a flexible material having heat resistance or corrosion resistance when considering fabrication or assembly.

Meanwhile, a gap protrusion may be formed on the outer circumferential surface of the inner case or the inner circumferential surface of the outer case or the outer circumferential surface of the inner case and the inner circumferential surface of the outer case to form a gap between the inner case and the outer case. 2 and 3 are views showing a case where the gap protrusion is formed on the outer peripheral surface of the inner case.

As shown in the drawing, the first inner case 110 and the second inner case 120 have a predetermined interval, that is, a space between the inner case 100 and the outer case 200 on the entire or part of the outer circumferential surface thereof. The gap protrusion 111 having a predetermined height and width is formed in a rib shape or a protrusion shape so as to be formed.

The gap protrusion 111 is formed to be long in the insertion direction of the outer case 200, as shown in Figure 2 can facilitate the assembly of the outer case 200. However, the gap protrusion 111 is an injection liquid to be introduced into the injection hole 218 of the outer case 200 to be described later, as shown in Figure 6 as the entire space between the inner case 100 and the outer case 200 It may be formed radially around the injection hole 218 to be able to flow quickly in the direction indicated by the arrow.

When the gap protrusion 111 is formed in the shape of a band-shaped rib, when the gap protrusion 111 is bisected into a portion where the injection hole 218 is located and a portion that is not, based on the injection hole 218. It is not preferable because the injection liquid to be injected through the injection hole 218 is filled only on one side and the injection liquid cannot be filled on the other side. Therefore, the gap protrusion 111 is preferably formed in a rib shape having both ends so that the portion with the injection hole 218 and the other portion is in communication with each other, in particular, the gap protrusion 111 is the inner case 100 Since it is intended to maintain the gap between and the outer case 200 may be formed in a shape that can meet this function, that is, a projection shape.

The gap protrusion 111 may be formed evenly on the outer circumferential surface of the inner case 100, but the gap protrusion 111 may be formed on a surface to which the inner case 100 and the outer case 200 are to be contacted. There is no need to form. For example, as shown in FIG. 3, the first sealing protrusion 114 provided in the first suction hole 113 of the first inner case 110 may have a second suction hole (not shown) of the first outer case 210. As the first sealing groove 214 provided in the 213 is in close contact with the first suction hole 113 and the second suction hole 213 is formed on the surface is not formed a separate gap protrusion. In addition, a second sealing protrusion 117 is formed on the bottom surface of the other side of the first inner case 110 so that a separate gap protrusion is not formed as it is coupled to the second sealing groove 216 of the first outer case 210. You may not. In addition, an end of the discharge guide tube 400 penetrating the second inner case 120 on the upper surface of the second inner case 220 is coupled to the third sealing groove 224 of the second outer case 220. As a separate gap protrusion may not be formed.

Here, the gap protrusion 111 may be formed to protrude on the side wall surface of the first inner case 110 as described above, in some cases at the corner of the inner case 100 or the outer case 200. The outer case 200 may be formed to press the inner case 100 more effectively to maintain the sealed state. For example, when the gap protrusion 111 is formed to be inclined or stepped by a predetermined height and width along the edge of the outer circumferential surface of the inner case 100, the force for pressing the joint portion of the inner case 100 is increased by that amount. It is possible to further increase the sealing effect.

Meanwhile, although an air layer may be formed in the space S2 between the inner case 100 and the outer case 200, the space S2 between both cases 100 and 200 when the sealing state at the joint is poor. In order to reduce the heat insulation effect of the air layer by introducing a hot refrigerant into the heat sink, a heat insulating material 500 may be installed in the space between the case 100 and 200 as shown in FIG. 2.

The insulating material 500 may be a variety of materials such as cotton or styrofoam, but considering the size or shape of the suction muffler 26 to form a material that is injected into a liquid to solidify in terms of simplifying the manufacturing process It may be desirable. For example, PDMS (polydimethylsiloxane), which is an elastomer, may be used as the heat insulator 500, and may be a material having a lower thermal conductivity than air.

In addition, the outer case 200 is formed with an injection hole 218 for injecting the liquid insulating material 500 into the space (S2) between the two cases (100, 200). Although one injection hole 218 may be formed to simplify the injection process, a plurality of injection holes 218 may be formed in some cases. For example, when the plurality of spaces (S2) between the inner case 100 and the outer case 200 is separated into a plurality of injection holes 218 should be formed separately in each space (S2), Even if it consists of one space S2, a plurality of injection holes 218 may be formed to evenly inject each portion.

In the figure, reference numeral 217 denotes an oil drain guide protrusion, SP denotes a suction pipe, and V2 denotes a discharge space.

The suction muffler for a compressor according to the present invention as described above is manufactured as follows.

First, the first inner case 110 and the second inner case 120 and the first outer case 210 and the second outer case 220 are manufactured in a predetermined shape. And the suction guide tube 300 and the discharge guide tube 400 is produced in a predetermined shape, respectively. (ST1)

Next, the discharge guide tube 400 is assembled to the first inner case 110 and then the first inner case 110 and the second inner case 120 are combined. At this time, the joint portions of the first inner case 110 and the second inner case 120 complete the inner case 100 by engaging the sealing surfaces 112 and 122 with each other. (ST2)

Next, the inner case 100 is inserted into the first outer case 210 and the second outer case 220 is covered on the top of the first outer case 210 so as to ultrasonically fusion the joint. By inserting and molding in a separate mold and double injection molding, the sealing part 230 is formed at the junction of the first outer case 210 and the second outer case 220 to complete the assembly of the outer case 200. At this time, the at least one gap protrusion 111 is formed on the outer circumferential surface of the inner case 100 so that the gap protrusion 111 is assembled when the first outer case 210 and the second outer case 220 are assembled. ) Is pressed against the first inner case 210 and the second inner case 220 at the same time to maintain a gap between the inner case 100 and the outer case 200 to a predetermined space (S2) (ST3)

Next, the insulator 500, such as PDMS, is injected into the liquid phase through the injection hole 218 provided in the outer case 200. (ST4)

Next, the liquid insulator 500 is cooled in the hearth so that the liquid may be solidified so that the heat insulator 500 is filled in the space in the solid state. (ST5)

In this way, the suction muffler is formed of a double-wall structure of the inner case and the outer case, and the inner temperature of the compressor sealed container is increased between the inner case and the outer case is filled with an insulating material having a lower heat transfer coefficient than air. It is possible to prevent the transfer to the noise space, through which the suction temperature of the refrigerant can be prevented from rising to reduce the suction loss of the compressor can further improve the performance of the compressor. 8 is a graph illustrating the outlet temperature of the refrigerant in the case where the suction muffler has a double wall structure and a heat insulating material is inserted between the walls. According to this, it can be seen that the outlet temperature drops by approximately 3 ° C. as compared with the case where the insulation is not inserted between the inner case and the outer case as in the present invention.

On the other hand, although not shown in the drawings, the assembly direction of the inner case and the outer case may be formed by assembling in opposite directions to each other. For example, the first inner case and the second inner case may be assembled in the vertical direction, while the first outer case and the second outer case may be assembled by pushing in the front and rear or left and right directions. In this case, since the basic configuration and manufacturing method are the same as the above-described embodiment, detailed description thereof will be omitted.

The compressor muffler and the method of manufacturing the same according to the present invention can be equally applied to a single reciprocating compressor as well as a double reciprocating compressor as in the above-described embodiment, and can be equally applied to an indirect suction reciprocating compressor as well as a direct suction type. The same may be applied to a reciprocating compressor to which other refrigerant is applied.

1 is a longitudinal sectional view showing an example of a reciprocating compressor to which a muffler for a compressor of the present invention is applied;

Figure 2 is a perspective view of the outer casing of the present invention compressor muffler broken;

3 is a longitudinal sectional view showing the assembly of the muffler according to FIG. 2;

4 and 5 are enlarged longitudinal cross-sectional views of each embodiment of the "A" of Figure 4,

Figure 6 is a schematic view showing another embodiment for the gap protrusion in the muffler according to Figure 2,

7 is a block diagram showing an assembly procedure of the muffler according to FIG. 2;

FIG. 8 is a graph illustrating a comparison value of outlet temperatures for the case where the compressor muffler according to FIG. 2 has a double wall structure and a case in which the insulation is filled between the walls and the case where the insulation is not filled.

** Description of the symbols in the main part of the drawing **

100: inner case 110: first inner case

111: gap protrusion 120: second inner case

200: outer case 210: first outer case

218: heat insulating material injection hole 220: the second outer case

300: suction guide pipe 400: discharge guide pipe

500: insulation

Claims (12)

An inner case in which the case is sealed to form at least one chamber; And And an outer case sealingly coupled to surround the inner case at a predetermined interval. The compressor muffler is filled with a heat insulating material in the space between the outer peripheral surface of the inner case and the inner peripheral surface of the outer case. The method of claim 1, The insulation material is a compressor muffler made of a material having a lower thermal conductivity than air. The method of claim 1, The insulation is a muffler for a compressor that can maintain a solid state at the operating temperature. The method of claim 1, Muffler for the compressor is formed in the outer case at least one injection hole for injecting the insulation. The method of claim 4, wherein Compressor muffler is formed on the outer circumferential surface of the inner case or the inner circumferential surface of the outer case at least one gap protrusion for maintaining a gap between the inner case and the outer case. The method of claim 5, The gap protrusion is a compressor muffler to form a flow path so that the space between the inner case and the outer case is in communication with the injection hole. The method of claim 1, The inner case is a plurality of cases are coupled so that the inner space is sealed, the surface of the plurality of cases are contacted with each other at least one or more times stepped surface is formed so that the stepped surface is engaged with each other coupled to the muffler . The method of claim 1, The outer case is coupled to a plurality of cases so that the inner space is sealed, the surface of the plurality of cases are contacted with each other at least one or more times stepped surface is formed so that the stepped surface is engaged with each other coupled to the muffler . The method of claim 8, The outer case is a muffler for a compressor for fusion or molding the outer peripheral surface of the joint portion a plurality of cases in contact with each other. The method according to any one of claims 1 to 9, The heat insulating material is a compressor muffler made of PDMS (polydimethylsiloxane) is an elastomer. The method of claim 10, At least one of the inner case and the outer case is a muffler for a compressor is formed of a polymer material containing fiber grass (fiber grass). Manufacturing an inner case and an outer case; Assembling the inner case and the outer case; Injecting a liquid insulating material into a space between the outer case and the inner case through the injection hole of the outer case while the inner case and the outer case are assembled; And Hardening the liquid insulator so as to solidify; manufacturing method of the muffler comprising a compressor.

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