WO2009132955A1

WO2009132955A1 - A compressor

Info

Publication number: WO2009132955A1
Application number: PCT/EP2009/054363
Authority: WO
Inventors: Emre Oguz; F. Alper Soysal
Original assignee: Arcelik Anonim Sirketi
Priority date: 2008-05-02
Filing date: 2009-04-13
Publication date: 2009-11-05
Also published as: EP2304235A1

Abstract

The present invention relates to a compressor (1) comprising a cylinder (2) wherein the compression process is performed, a piston (3) that is reciprocated inside the cylinder (2) for sucking and pumping the circulating fluid, and at least one cylinder head (4) opposite the piston (3), having at least one suction chamber (5) where the sucked circulating fluid fills in and at least one exhaust chamber (6) where the pumped circulating fluid fills in and a valve table (7) that separates the cylinder head (4) from the cylinder (2), having at least one suction valve (8), regulating the exit of the circulating fluid from the suction chamber (5) and entry into the cylinder (2) and at least one exhaust valve (9) regulating the exit of the circulating fluid from the cylinder (2) and entry into the exhaust chamber (6).

Description

PatXML 1/8 BB1311-7.738

Description

A COMPRESSOR

[0001] The present invention relates to a compressor used in cooling devices.

[0002] When the compressor is active, the heat transfer resulting from the electric motor waste heat, the heat generated due to frictions and the high temperatures reached at the end of the compression causes the components in the suction path of the compressor, for example the suction muffler and hence the circulating fluid flowing therein, to be heated and thereby to adversely affect the compressor capacity and performance since the density of the circulating fluid is reduced by heating.

[0003] On the other hand, during the operation of the refrigerator the components within the compressor are heated as long as the compressor is activated, and afterwards the cooling phase begins when the compressor is deactivated. Even though the compressor casing can cool faster, the cooling of the components in the suction path, for example the suction muffler, is insufficient. Accordingly, the components in the suction path transfer heat to the circulating fluid and thus the compressor performance is affected adversely.

[0004] Similarly, in the exhaust path, the circulating fluid that is heated by the increasing pressure is hotter than the components it is in contact with, for example the exhaust muffler. For this reason, heat is transferred from the circulating fluid towards the components and this situation affects the performance of the compressor negatively.

[0005] In the prevalent embodiments, in order to avoid these problems, the components, for example the suction and exhaust mufflers are predominantly produced of plastic based materials and materials with both heat and oil resistance and also with low thermal conductivity, for example PBT material containing 30 % glass fiber additive, is used.

[0006] In the state of the art United States of America Patent Document No US4573880, a hermetically sealed motor compressor is explained comprising a suction muffler produced of thermally insulative material for preventing the heating of the refrigerant fluid flowing therein.

[0007] In another state of the art United States of America Patent Application No PatXML 2/8 BB1311-7.738

US2004244385, various embodiments are explained wherein thermoelectric devices are disposed on various surfaces of the compressor for increasing the compressor efficiency. One of the embodiments explained relates to the thermoelectric device being mounted to receive thermal energy from the suction muffler surface.

[0008] In another state of the art document, the European Patent Application No EP1697637, a hermetic compressor is explained comprising a partially double-walled muffler for preventing heating of the refrigerant fluid passing therethrough.

[0009] The aim of the present invention is the realization of a compressor with an improved performance by preventing the losses resulting from the unwanted heat transfer between the compressor components and the circulating fluid.

[0010] The compressor realized in order to attain the aim of the present invention and explicated in the attached claims, comprises at least one reservoir filled with phase changing material that

• is disposed such that heat transfer in the suction path is reduced toward the circulating fluid and/or

• is disposed such that heat transfer in the exhaust path from the circulating fluid toward the compressor components is reduced.

[0011] By means of the phase changing material characteristic, in the suction path, heat transfer toward the circulating fluid is reduced and in the exhaust path from the circulating fluid toward the other components. Accordingly, the decrease of performance originating from unwanted heat transfer is minimized.

[0012] In an embodiment of the present invention, the compressor comprises at least one suction muffler and at least one reservoir disposed inside the suction muffler such that the heat transfer from the suction muffler to the circulating fluid is decreased.

[0013] The reservoir is disposed such that the muffler body is entirely covered or at least the parts wherein heat transfer is intensive is covered, e.g. the portions proximate to the motor.

[0014] In an embodiment of the present invention, the reservoir is disposed such PatXML 3/8 BB1311-7.738

that the walls of the flow duct inside the suction muffler are covered.

[0015] In another embodiment of the present invention, the reservoir is disposed in the cylinder head, on the suction and exhaust chamber walls facing each other. Thus, the heat transfer between the wall and the circulating fluid is minimized thereby increasing the compressor efficiency.

[0016] In an embodiment of the present invention, the compressor comprises at least one exhaust muffler and at least one reservoir disposed inside the exhaust muffler so that the heat transfer from the circulating fluid towards the exhaust muffler is reduced.

[0017] In the compressor of the present invention, the circulating fluid is prevented from heating by absorbing heat from the other components of the compressor in the suction path and cooling by transferring heat to the other components of the compressor in the exhaust path and consequently the compressor efficiency is improved.

[0018] The compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

[0019] Figure 1 - is the cross sectional view of a compressor.

[0020] Figure 2 - is the schematic view of the suction and exhaust paths in an embodiment of the present invention.

[0021] Figure 3 - is the schematic view of a suction muffler used in an embodiment of the present invention.

[0022] Figure 4 - is the schematic view of a suction muffler used in another embodiment of the present invention.

[0023] The elements illustrated in the figures are numbered as follows:

1. Compressor

2. Cylinder

3. Piston

4. Cylinder head

5. Suction chamber

6. Exhaust chamber

7. Valve table

8. Suction valve

9. Exhaust valve PatXML 4/8 BB1311-7.738

10. Reservoir

11. Suction muffler

12. Exhaust muffler

13. Body

14. Resonator room

15. Inlet port

16. Outlet port

17. Flow duct

18. Opening

[0024] The compressor (1) of the present invention comprises

• a cylinder (2) wherein the compression process is performed,

• a piston (3) that is reciprocated inside the cylinder (2) for enabling the sucking and the pumping of the circulating fluid,

• a suction path (SP) where through the circulating fluid passes during suction,

• an exhaust path (EP) where through the circulating fluid passes during exhaust,

• at least one cylinder head (4) disposed opposite the piston (3), having at least one suction chamber (5) where the sucked circulating fluid fills in and at least one exhaust chamber (6) where the pumped circulating fluid fills in and

• a valve table (7) that separates the cylinder head (4) from the cylinder (2), having at least one suction valve (8), regulating the exit of the circulating fluid from the suction chamber (5) and entry into the cylinder (2) and at least one exhaust valve (9) regulating the exit of the circulating fluid from the cylinder (2) and entry into the exhaust chamber (6) (Figure 1).

[0025] The compressor (1) of the present invention furthermore comprises at least one reservoir (10) filled with phase changing material, disposed on the suction path (SP) and/or the exhaust path (EP), positioned such that heat transfer is reduced in the suction path (SP) toward the circulating fluid, and in the exhaust path (EP) from the circulating fluid toward the compressor (1) components. The performance of the compressor (1) is PatXML 5/8 BB1311-7.738

improved by preventing the circulating fluid from heating in the suction path (SP) and cooling in the exhaust path (EP) due to the characteristic of the phase changing material that absorbs heat without an increase in temperature while changing phase.

[0026] In an embodiment of the present invention, the compressor (1) comprises at least one suction muffler (11) where through the circulating fluid passes, for decreasing the noise generated by the circulating fluid during suction and at least one exhaust muffler (12) where through the circulating fluid passes, for decreasing the noise generated by the circulating fluid during exhaust.

[0027] During the operation of the compressor (1), the circulating fluid coming from the evaporator with low pressure and low temperature, enters into the suction muffler (11) on the suction path (SP) and is directed from the suction muffler (11) to the suction chamber (5) again disposed on the suction path (SP) in the cylinder head (4). The circulating fluid sucked into the cylinder (2) from the suction chamber (5) by the motion of the piston (3), is compressed inside the cylinder (2) reaching high pressure and temperature. As the exhaust valve (9) is opened by the motion of the piston (3) in the pumping direction, the circulating fluid this time passes from the cylinder (2) into the exhaust chamber (6) on the exhaust path (EP). Afterwards, the circulating fluid is delivered to the refrigeration cycle by passing through the exhaust muffler (12) and the exhaust duct again disposed on the exhaust path (EP) (Figure 2).

[0028] In an embodiment of the present invention, the suction muffler (11) comprises a body (13), at least one resonator room (14) disposed inside the body (13) that serves to attenuate vibrations, an inlet port (15) for the entry of the circulating fluid returning from the refrigeration cycle into the suction muffler (11) and an outlet port (16) for the exit of the circulating fluid from the suction muffler (11), one or more flow ducts (17) where through the circulating fluid flows and one or more openings (18) arranged on the wall of the flow duct (17) for the circulating fluid to be dispersed from the flow duct (17) into the resonator room (14). In this embodiment, the compressor (1) comprises at least one reservoir (10) filled with phase PatXML 6/8 BB1311-7.738

changing material, disposed to be in contact with the resonator room (14) and/or the flow duct (17).

[0029] In a derivative of this embodiment of the present invention, the compressor (1) comprises at least one reservoir (10) that covers the inner surface of the body (13) at least partially (Figure 3). Accordingly, the heat transfer towards the circulating fluid from the body (13) and from outside the suction muffler (11) is reduced and the performance of the compressor (1) is improved.

[0030] In a version of this embodiment, the reservoir (10) is disposed on the side of the body (13) facing the motor. Thus, the heat transferred to the circulating fluid is reduced in this region wherein heat transfer is intensive without using a large amount of phase changing material.

[0031] In another version of this embodiment, the compressor (1) comprises at least one reservoir (10) that is positioned to cover the wall of the flow duct (17) (Figure 4). Accordingly, the heat transfer to the circulating fluid is minimized while passing through the flow duct (17).

[0032] In another embodiment of the present invention, the compressor (1) comprises at least one reservoir (10) that is disposed in the cylinder head (4) on the walls of the suction and exhaust chambers (5,6) facing each other (Figure 2). Accordingly, in the suction path (SP) heat transfer is reduced from this wall to the circulating fluid and/or from the circulating fluid to this wall in the exhaust path (EP), thereby the compressor (1) performance is improved.

[0033] In an embodiment of the present invention, the compressor (1) comprises at least one exhaust muffler (12) where through the circulating fluid passes during exhaust for decreasing the noise generated by the circulating fluid and at least one reservoir (10) that is in contact with the exhaust muffler (12). Consequently, the heat flow from the exhaust muffler (12), heated by the circulating fluid flowing therein with high temperature and pressure, to the other components of the compressor (1) is minimized.

[0034] In the compressor (1) of the present invention, the compressor efficiency is improved by reducing unwanted heat transfers.

Claims

PatXML 7/8 BB1311-7.738Claims

1. A compressor (1) that comprises a cylinder (2) wherein the compression process is performed, a piston that is reciprocated inside the cylinder (2) for sucking and pumping the circulating fluid, a suction path (SP) where through the circulating fluid passes during suction, an exhaust path (EP) where through the circulating fluid passes during exhaust, at least one cylinder head (4) disposed opposite the piston (3), having at least one suction chamber (5) where the sucked circulating fluid fills in and at least one exhaust chamber (6) where the pumped circulating fluid fills in and a valve table (7) that separates the cylinder head (4) from the cylinder (2), having at least one suction valve (8), regulating the exit of the circulating fluid from the suction chamber (5) and entry into the cylinder (2) and at least one exhaust valve (9) regulating the exit of the circulating fluid from the cylinder (2) and entry into the exhaust chamber (6) and characterized by at least one reservoir (10) filled with phase changing material, disposed on the suction path (SP) such that heat transfer is reduced toward the circulating fluid, and/or disposed on the exhaust path (EP), such that heat transfer is reduced from the circulating fluid toward the other components.

2. A compressor (1) as in Claim 1 , characterized by at least a suction muffler (11) where through the circulating fluid passes during suction and the reservoir (10) disposed to be at least partially in contact with the suction muffler (11).

3. A compressor (1) as in Claim 2, characterized in that the suction muffler (11) comprises a body (13), at least one resonator room (14) disposed inside the body (13) that serves to attenuate vibrations, an inlet port (15) for the circulating fluid returning from the refrigeration cycle to enter therein and an outlet port (16) for the exit of the circulating fluid therefrom, one or more flow ducts (17) where through the circulating fluid flows and one or more openings (18) arranged on the wall of the flow duct (17) for the circulating fluid to be dispersed from the flow duct (17) into the resonator room (14) and the reservoir (10) being disposed to be at least partially in contact with the resonator room (14) and/or the flow duct (17).

4. A compressor (1) as in Claim 3, characterized in that the reservoir (10) at least partially covers the inner surface of the body (13). PatXML 8/8 BB1311-7.738

5. A compressor (1) as in Claim 4, characterized in that the reservoir (10) is disposed on the side of the body (13) facing the motor.

6. A compressor (1) as in Claim 3, characterized in that the reservoir (10) that is positioned to cover the circumference of the flow duct (17).

7. A compressor (1) as in any one of the above Claims, characterized in that the reservoir (10) is disposed on the walls of the suction chamber (5) and the exhaust chamber (6) facing each other.

8. A compressor (1) as in any one of the above Claims, characterized by at least one exhaust muffler (12) where through the circulating fluid passes during exhaust and the reservoir (10) that is disposed to be in contact with the exhaust muffler (12).