EP2859236A1

EP2859236A1 - A compressor comprising a cylinder head

Info

Publication number: EP2859236A1
Application number: EP13723173.4A
Authority: EP
Inventors: Hakan Tunca; Ahmet Refik Ozdemir; Ersin Donmez
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2012-06-06
Filing date: 2013-05-18
Publication date: 2015-04-15
Anticipated expiration: 2033-05-18
Also published as: CN104583595A; BR112014030409A2; TR201718749T4; WO2013182409A1; EP2859236B1

Abstract

A compressor (1) comprising: a casing (2) carrying the components therein, a cylinder (3) wherein the compression process is performed, a cylinder head (4) disposed on the cylinder (3), and a valve plate (5) situated between the cylinder (3) and the cylinder head (4). The cylinder head (3) is formed on the valve plate (5) by overmolding method, thereby forming a single piece.

Description

A COMPRESSOR COMPRISING A CYLINDER HEAD

The present invention relates to a compressor comprising a cylinder head, that is used in cooling devices.
The hermetic compressors used in domestic type refrigerators comprises a cylinder wherein the compression process is performed, the cylinder head wherein the suction chamber and the exhaust chamber are disposed and the valve table disposed between the cylinder and the cylinder head. The cylinder head is fixed on the valve table with methods such as screwing, etc.
The refrigerant, compressed inside the cylinder, with increased pressure and temperature is discharged into the exhaust chamber of the cylinder head after leaving the cylinder. The temperature of the cylinder head increases with the effect of the refrigerant, filled in the cylinder head, with high pressure and temperature. The cylinder head becomes deformed with the effect of high temperature when produced from plastic material. Therefore, a gap occurs between the valve table and the cylinder head. Therefore, refrigerant and heat passage to the outside environment occurs through between the cylinder head and the valve table. Accordingly, the compressor efficiency and performance are adversely affected.
In the International Patent Application No. WO2010133503, a compressor is described, having a cylinder head produced from plastic material, a framework produced from metal material, embedded into at least some of the cylinder head walls and the cylinder head produced by being coated on the framework by plastic injection method.
The aim of the present invention is the realization of a compressor wherein the passage of refrigerant and heat is prevented.
The compressor, realized in order to attain the aims of the present invention and explicated in the attached claims, comprises a casing carrying the components therein, a cylinder wherein the compression process is performed, a cylinder head disposed on the cylinder, a valve table situated between the cylinder and the cylinder head, at least one exhaust chamber wherein the pumped circulating fluid fills, situated below the cylinder head and at least one suction chamber wherein the sucked circulating fluid fills.
In the compressor of the present invention, the cylinder head is formed on the valve table by overmolding method. The valve table is placed into the mould after being produced. Plastic is injected over the valve table placed into the mould and the cylinder head is produced on the valve table. Thus, the cylinder head is produced so as not to be separated from the valve table without being damaged. The surfaces of the cylinder head and the valve table facing each other entirely contact one another and are prevented from separating from one another. Thus, leakage of refrigerant through between the cylinder head and the valve table to the outside environment is prevented. By means of the one-piece valve table and the cylinder head, ease of assembly is provided. Furthermore, heat and sound are prevented from dissipating to the outside environment during flow of the refrigerant.
In an embodiment of the present invention, the compressor comprises the valve table produced from metal material and the cylinder head produced from plastic material. The cylinder head and the valve table are joined by overmolding method. Integrated production of different materials is possible by means of the overmolding method.
In an embodiment of the present invention, the compressor comprises at least one opening that provides the cylinder head to be fixed to the valve table by being filled while the valve table is coated. During overmolding, the openings situated on the valve table are also filled with plastic material and thus the cylinder head is prevented from being separated from the valve table as a result of any kind of force.
In an embodiment of the present invention, the opening is arranged on the surface of the valve table opposite to its wall between the suction chamber and the exhaust chamber. The opening is filled in during overmolding.
In an embodiment of the present invention, the compressor comprises at least one flange that surrounds the sides of the valve table. The flange is almost entirely embedded into the cylinder head during the overmolding process.
In an embodiment of the present invention, the flange extends perpendicularly to the plane of the valve table, over the valve table. The flange remains almost entirely inside the cylinder head.
In an embodiment of the present invention, the compressor comprises the cylinder head having at least one housing situated on the cylinder head and surrounding the flange. The housing surrounds the flange all around. The housing provides the cylinder head to be tightly attached to the valve table.
In an embodiment of the present invention, the flange at least partially surrounds the cylinder head. The cylinder head remains inside the flange.
In an embodiment of the present invention, the flange extends in parallel direction to the plane of the valve table. The flange is almost entirely embedded into the cylinder head after the overmolding process.
In an embodiment of the present invention, the compressor comprises at least one opening arranged on the flange. The opening is filled with plastic material while the overmolding process is performed on the valve table.
In an embodiment of the present invention, the compressor comprises at least two openings on the side of the valve table, situated on planes perpendicular to one another and intersecting one another. Thus, the cylinder head is provided to be tightly attached to the valve table.
In an embodiment of the present invention, the compressor comprises at least one suction muffler, having a hollow, closed volume which provides attenuation of the noise generated during pumping of the refrigerant fluid. The refrigerant reaches the cylinder by passing through the suction muffler and the suction chamber. At the end of the compression process, the refrigerant with increased pressure and temperature is discharged into the exhaust chamber of the cylinder head after leaving the cylinder. The sound originating from the refrigerant flow is provided to be attenuated by passing the refrigerant through the suction muffler.
In an embodiment of the present invention, the compressor comprises at least one headpiece wherein the suction chamber is arranged, mounted on the suction muffler and which is produced integrated with the cylinder head. Thus, leakage between the cylinder head and the headpiece is prevented. Furthermore, an additional element is not required for integrating the headpiece to the cylinder head. Ease of assembly is provided by means of the cylinder head and the headpiece being integrated.
In an embodiment of the present invention, the suction muffler is produced integrated with the cylinder head. Thus, leakage between the cylinder head and the suction muffler is prevented.
In an embodiment of the present invention, the compressor comprises at least one frame that is disposed on the valve table. The frame placed on the valve table is coated with plastic.
By means of the present invention, a compressor is realized wherein the surfaces of the cylinder head and the valve table facing one another contact each other leak-proofingly. By means of producing the cylinder head and the valve table by the overmolding method, there remains no gap therebetween and thus refrigerant is prevented from leaking to the outside environment.
The compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 – is the cross-sectional view of a compressor.
Figure 2 – is the rear view of a valve table and a cylinder head.
Figure 3 – is the exploded view of the valve table and the cylinder head in an embodiment of the present invention.
Figure 4 – is the exploded view of the valve table, the frame and the cylinder head in an embodiment of the present invention.
Figure 5 – is the rear view of the valve table in an embodiment of the present invention.
Figure 6 – is the front view of the valve table in an embodiment of the present invention.
Figure 7 – is the exploded view of the valve table and the cylinder head in an embodiment of the present invention.
Figure 8 – is the perspective view of the valve table in an embodiment of the present invention.
Figure 9 – is the rear view of a cylinder head, a valve table, a headpiece and a suction muffler.
The elements illustrated in the figures are numbered as follows:

Compressor
Casing
Cylinder
Cylinder head
Valve table
Opening
Flange
Housing
Suction muffler
Headpiece
Frame
Suction chamber
Exhaust chamber

The compressor (1) comprises a casing (2) carrying the components therein, a cylinder (3) wherein the compression process is performed, a cylinder head (4) disposed on the cylinder (3), a valve table (5) situated between the cylinder (3) and the cylinder head (4), at least one exhaust chamber (13) wherein the pumped circulating fluid fills, disposed below the cylinder head (4) and at least one suction chamber (12) wherein the sucked circulating fluid fills (Figure 1). The refrigerant sucked from inside the casing (2) reaches the cylinder (3) by passing through the suction chamber (12) of the cylinder head (4). At the end of the compression process, the refrigerant with increased pressure and temperature is discharged into the exhaust chamber (13) of the cylinder head (4) after leaving the cylinder (3).
The cylinder head (4) of the present invention is produced by implementing overmolding method over the valve table (5). The valve table (5) is placed into the mould after being produced. Plastic is injected over the valve table (5) placed into the moud and the cylinder head (4) is produced on the valve table (5). Thus, the cylinder head (4) is produced so as not to be separated from the valve table (5) without being damaged. By means of producing the cylinder head (4) integrated with the valve table (5), there remains no gap between the cylinder head (4) and the valve table (5) and the cylinder head (4) is prevented from separating from the valve table (5) when the interior temperature of the cylinder head (4) increases. The efficiency of the compressor (1) is improved by preventing refrigerant leakage between the cylinder head (4) and the valve table (5). Furthermore, the cylinder head (4) and the valve table (5) produced as a single piece provides ease of assembly (Figure 2).
In a derivative of this embodiment, the valve table (5) is joined with the cylinder head (4) by overmolding method. The cylinder head (4) and the valve table (5) produced separately become integrated with the overmolding method. The interior temperature of the exhaust chamber (13), situated under the cylinder head (4), increases due to the compressed refrigerant with increased temperature and pressure coming from the cylinder (3). By means of the cylinder head (4) and the valve table (5) produced as a single piece, there remains no gap at contact points of the cylinder head (4) and the valve table (5), thereby providing leak-proofing.
In an embodiment of the present invention, the compressor (1) comprises the valve table (5) produced from metal material and the cylinder head (4) produced from plastic material. Integrated production of different materials is possible by the overmolding method. By means of joining the cylinder head (4) and the valve table (5) by implementing the overmolding method, there remains no gap at contact points of the cylinder head (4) and the valve table (5), thereby providing leak-proofing.
In an embodiment of the present invention, the compressor (1) comprises at least one opening (6, 106, 206) arranged on the valve table (5), providing the cylinder head (4) to be fixed to the valve table (5) by being filled during the overmolding process. During the overmolding process, the opening (6, 106, 206) arranged on the valve table (5) is filled with plastic material. Thus, the cylinder head (4) is joined with the valve table (5) inseparably (Figure 5, Figure 6).
In an embodiment of the present invention, the opening (6, 106) is arranged on the surface of the valve table (5) opposite to its wall disposed between the suction chamber (12) and the exhaust chamber (13). The opening (6, 106) is filled during overmolding. Thus, the cylinder head (4) is provided to be more tightly attached to the valve table (5).
In an embodiment of the present invention, the compressor (1) comprises a flange (7) that extends from the sides of the valve table (5) so as to almost entirely surround the valve table (5). During overmolding, the flange (7) is coated almost all around by plastic. An additional attachment surface is obtained by means of the flange (7) (Figure 4).
In an embodiment of the present invention, the flange (7) is perpendicular to the plane of the valve table (5). After the overmolding process, the flange (7) extends almost entirely into the cylinder head (4). The flange (7) is entirely embedded into the cylinder head (4). The cylinder head (4) that becomes integrated with the valve table (5) is prevented from sliding off the valve table (5) (Figure 7, Figure 8).
In an embodiment of the present invention, the compressor (1) comprises a housing (8) disposed on the cylinder head (4) and which surrounds the flange (7). During overmolding, the housing (8), wherein the flange (7) is disposed, is formed on the cylinder head (4) (Figure 7).
In an embodiment of the present invention, the flange (7) almost entirely surrounds the cylinder head (4). The flange (7) is disposed on the surface of the valve table (5) that is coated with plastic. During overmolding, plastic fills in between the walls of the flange (7). The flange (7) prevents the cylinder head (4) from moving on the valve table (5) by surrounding the cylinder head (4).
In an embodiment of the present invention, the flange (7) extends from the sides of the valve table (5) in parallel direction to the plane of the valve table (5) and is almost entirely embedded into the cylinder head (4) after the overmolding process. During overmolding, the flange (7) is coated with plastic (Figure 4).
In an embodiment of the present invention, the compressor (1) comprises at least one opening (206) arranged on the flange (7). During the overmolding process, the flange (7) is provided to be tightly attached to the cylinder head (4) as the opening (206) is filled. Consequently, the flange (7) is integrated with the cylinder head (4) without requiring an additional element (Figure 4, Figure 7, Figure 8).
In an embodiment of the present invention, the compressor (1) comprises at least two openings (6, 106) on the side of the valve table (5), intersecting one another and situated on surfaces perpendicular to one another. The openings (6, 106) are filled by plastic during overmolding. Thus, the plastic inside the openings (6, 106) merges, providing the cylinder head (4) to be tightly attached to the valve table (5). Thus, no gap remains between the cylinder head (4) and the valve table (5) by preventing the surfaces of the cylinder head (4) and the valve table (5) facing one another from separating as a result of applying any kind of force from one or more surfaces (Figure 5).
In an embodiment of the present invention, the compressor (1) comprises at least one suction muffler (9), having a hollow, closed volume which provides attenuation of the noise generated during pumping of the refrigerant fluid. The refrigerant reaches the cylinder (3) by passing through the suction muffler (9) and the suction chamber (12). At the end of the compression process, the refrigerant with increased pressure and temperature is discharged into the exhaust chamber (13) of the cylinder head (4) after leaving the cylinder (3). The sound originating from the refrigerant flow is provided to be attenuated by passing the refrigerant through the suction muffler (9).
In an embodiment of the present invention, the compressor (1) comprises a headpiece (10) mounted on the suction muffler (9) and which is produced integrated with the cylinder head (4). The suction chamber (12) is situated inside the headpiece (10). Leak-proofing is provided between the suction chamber (12) and the cylinder head (4) by means of producing the headpiece (10) integrated with the cylinder head (4).
In an embodiment of the present invention, the suction muffler (9) is produced together with the cylinder head (4) during the overmolding process. Thus, no gap remains between the cylinder head (4) and the suction muffler (9). Furthermore, elevation difference that may occur due to size variations resulting from producing the suction muffler (9) and the cylinder head (4) separately is prevented, thereby eliminating probable leak-proofing problems (Figure 9).
In an embodiment of the present invention, the compressor (1) comprises a frame (11) produced from metal material and disposed on the valve table (5). The frame (11) placed on the valve table (5) is coated with plastic by the overmolding method. Thus, the frame (11) that is integrated with the cylinder head (4) gives strength to the cylinder head (4). The frame (11) increases the rigidity of the cylinder head (4) while the temperature and pressure increase (Figure 3, Figure 4).
By means of the present invention, a compressor (1) is realized wherein refrigerant and heat leakage is prevented by eliminating any gap between the valve table (5) and the cylinder head (4). Thus, the efficiency of the compressor (1) is improved. Furthermore, the cylinder head (4) being integrated with the valve table (5) provides ease of assembly.
It is to be understood that the present invention is not limited to the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These different embodiments should also be considered within the scope of the claims of the present invention.

Claims

A compressor (1) comprising

- a casing (2) carrying the components therein,

- a cylinder (3) wherein the compression process is performed,

- a cylinder head (4) disposed on the cylinder (3),

- a valve table (5) situated between the cylinder (3) and the cylinder head (4),

- at least one exhaust chamber (13) disposed below the cylinder head (4) and wherein the pumped circulating fluid fills, and

- at least one suction chamber (12) wherein the circulating fluid fills,

characterized in that

- the cylinder head (4) that is produced over the valve table (5) by implementing the overmolding method.
The compressor (1) as in Claim 1, characterized in that the valve table (5) produced from metal material and the cylinder head (4) produced from plastic material.
The compressor (1) as in Claim 1 or 2, characterized in that an opening (6, 106, 206) arranged on the valve table (5), providing the cylinder head (4) to be fixed to the valve table (5) by being filled during the overmolding process.
The compressor (1) as in Claim 3, characterized in that the opening (6, 106) arranged on the surface of the valve table (5) opposite to its wall disposed between the suction chamber (12) and the exhaust chamber (13).
The compressor (1) as in any one of the Claims 1 to 4, characterized in that a flange (7) that extends from the sides of the valve table (5) so as to almost entirely surround the valve table (5).
The compressor (1) as in Claim 5, characterized in that the flange (7) that is perpendicular to the plane of the valve table (5) and which extends almost entirely into the cylinder head (4) after the overmolding process.
The compressor (1) as in Claim 5 or 6, characterized in that at least one housing (8) arranged on the cylinder head (4) and surrounding the flange (7).
The compressor (1) as in Claim 5, characterized in that the flange (7) that almost entirely surrounds the cylinder head (4).
The compressor (1) as in Claim 5, characterized in that the flange (7) that extends from the sides of the valve table (5) in parallel direction to the plane of the valve table (5) and which is almost entirely embedded into the cylinder head (4) after the overmolding process.
The compressor (1) as in any one of the Claims 5 to 9, characterized in that at least one opening (206) arranged on the flange (7).
The compressor (1) as in any one of the Claims 3 to 10, characterized in that at least two openings (6, 106) on the side of the valve table (5), intersecting one another and situated on surfaces perpendicular to one another.
The compressor (1) as in any one of the above Claims, characterized in that a suction muffler (9) having a hollow, closed volume that provides the attenuation of the noise generated during pumping of the refrigerant fluid.
The compressor (1) as in Claim 12, characterized in that a headpiece (10) mounted on the suction muffler (9) and which is produced integrated with the cylinder head (4).
The compressor (1) as in Claim 12 or 13, characterized in that the suction muffler (9) that is produced together with the cylinder head (4) during the overmolding process.
The compressor (1) as in any one of the above Claims, characterized in that a frame (11) that is produced from metal material and disposed on the valve table (5).