EP2917579B1

EP2917579B1 - A compressor comprising cylinder head

Info

Publication number: EP2917579B1
Application number: EP13766107.0A
Authority: EP
Inventors: Sati Sevtap SENER; Bilgin Hacioglu; Cihan Gunduz
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2012-10-05
Filing date: 2013-09-24
Publication date: 2017-07-12
Anticipated expiration: 2033-09-24
Also published as: EP2917579A1; KR20150067231A; CN104884804B; BR112015007613A2; KR101811793B1; CN104884804A; WO2014053364A1

Description

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 a suction chamber and an exhaust chamber are disposed and a valve table disposed between the cylinder and the cylinder head.
The cylinder head is fixed on the valve table with connection elements, such as screw, etc. However, the screws used in the screwing method do not make the same amount of pressure onto all surfaces of the cylinder head and the valve table contacting each other. The pressure exerted by the screws onto the surfaces of the cylinder head and the valve table contacting each other is less than at the points where the screws are connected to the cylinder head and the valve table. For this reason, a gap forms between the surfaces of the cylinder head and the valve table contacting each other apart from the points where the screws are connected, and thus the refrigerant leaks outside. Moreover, applying pressure only at the points where the screws are connected causes the deformation of the cylinder head.
In the United States Patent Application No. US20040071564 , a compressor is disclosed, having a valve package situated on the suction muffler and enabling the grouping of the valve table and the cylinder head.
United States Patent US 5 362 215 discloses a modular pump in which a discharge valve assembly is located in a cylinder head block which is disposed between an end plate and a cylinder. Moreover, a cylinder head retainer is screwed to an internal thread of the end plate, pressing a valve cover onto the cylinder head block.
United States Patent US 3 880 053 discloses a pump with a cylinder that is internally threaded at one end to receive an externally threaded clamp collar which presses a cylinder head onto the cylinder.
The aim of the present invention is the realization of a compressor wherein the leakage 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 body situated in the casing, 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.
The compressor of the present invention comprises an external screw thread situated on the cylinder head and at least one internal screw thread situated on the body, that locks with the external screw thread by going into each other while the cylinder head is being mounted to the body, thus providing the cylinder head and the body to be fixed to each other. The external screw thread extends from the base of the suction chamber and the exhaust chamber situated below the cylinder head towards the outside of the suction chamber and the exhaust chamber. The valve table is placed into the external screw thread. While the cylinder head containing the valve table therein is being placed onto the body, the external screw thread moves on the internal screw thread. With the interlocking of the external screw thread and the internal screw thread, the cylinder head is provided to be firmly fixed to the body. Thus, the refrigerant is prevented from leaking from around the valve table situated between the body and the cylinder head that interlock with each other, providing ease of assembly. Furthermore, heat or sound insulation is provided during the flow of the refrigerant.
In an embodiment of the present invention, the compressor comprises at least one protrusion extending from the surface of the cylinder head facing the valve table and whereon the external screw thread is situated, and furthermore at least one housing situated on the body and wherein the protrusion is placed.
In an embodiment of the present invention, the diameter of the valve table is at least partially smaller than the diameter of the protrusion. The valve table has a shape matching that of the protrusion. The valve is joined with the cylinder head by being placed into the protrusion.
In an embodiment of the present invention, the compressor comprises at least one extension situated on the valve table and at least one chamber situated on the cylinder head and wherein the extension is placed. With the extension being placed into the chamber, the valve table and the cylinder head are provided to be grouped so that the suction chamber and the suction hole align with the exhaust chamber and the exhaust hole.
In an embodiment of the present invention, the housing and the extension have circular cross-sections. The housing and the protrusion interlock. When the protrusion is placed into the housing, the external screw thread interlocks with the internal screw thread and a gap is prevented from remaining between the body and the cylinder head.
In an embodiment of the present invention, the housing has a diameter larger than the diameter of the protrusion so that the protrusion can be placed therein. The housing and the protrusion have hollow, annular shapes.
In an embodiment of the present invention, the compressor comprises at least one first sealing element situated between the valve table and the cylinder head. The diameter of the first sealing element is at least partially larger than the diameter of the protrusion. The first sealing element is fitted over the protrusion and completely surrounds the protrusion. When the cylinder head is placed onto the body, the first sealing element remains between the body and the cylinder head and provides leak-proofing between the cylinder head and the body.
In an embodiment of the present invention, the compressor comprises at least one circular second sealing element situated between the body and the valve table. Together with the valve table, the second sealing element remains in the housing and the protrusion that interlock with each other.
In an embodiment of the present invention, the cross-sectional area of the cylinder head is hexagonal. The cylinder head can be easily rotated by means of a fixing tool such as a wrench. Meanwhile, the external screw thread moves over the internal screw thread and thus the cylinder head and the body interlock with each other.
By means of the present invention, a compressor is realized, having the cylinder head and the body comprising a protrusion and a housing interlocked with each other by means of an external screw thread and an internal screw thread situated thereon. Thus, refrigerant and heat leakage is prevented by eliminating any gap between the cylinder head and the body, thus improving the efficiency of the compressor.
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 perspective view of the body and the cylinder head when the cylinder head is mounted onto the body in an embodiment of the present invention.
Figure 3 - is the rear perspective view of the cylinder head in an embodiment of the present invention.
Figure 4 - is the exploded view of the valve table, the body and the cylinder head in an embodiment of the present invention.
Figure 5 - is the perspective view of the body and the cylinder head when the cylinder head is mounted onto the body from a different angle.
Figure 6 - is the rear perspective view of the cylinder head and the valve table in another embodiment of the present invention.
Figure 7 - is the exploded view of the valve table, the body and the cylinder head in another embodiment of the present invention.

The elements illustrated in the figures are numbered as follows:

1. Compressor
2. Casing
3. Cylinder
4. Body
5. Cylinder head
6. Valve table
7. First sealing element
8. Second sealing element
9. External screw thread
10. Internal screw thread
11. Protrusion
12. Housing
13. Extension
14. Chamber

The compressor (1) comprises a casing (2) carrying the components therein, a cylinder (3) wherein the compression process is performed, a body (4) disposed inside the casing (2), that carries and/or bears mechanical components like the cylinder (3), crankshaft and the piston rod, a cylinder head (5) disposed on the cylinder (3), and a valve table (6) situated between the cylinder (3) and the cylinder head (5) (Figure 1). The refrigerant sucked from inside the casing (2) reaches the cylinder (3) by passing through the cylinder head (5). At the end of the compression process, the refrigerant with increased pressure and temperature is discharged into the cylinder head (5) after leaving the cylinder (3) (Figure 1).
The compressor (1) of the present invention comprises at least one exhaust chamber wherein the pumped circulating fluid fills, disposed below the cylinder head (5), at least one suction chamber wherein the sucked circulating fluid fills, at least one external screw thread (9) situated on the cylinder head (5) and at least one internal screw thread (10) situated on the body (4), providing the grouping of the body (4), the valve table (6) and the cylinder head (5) by interlocking with the external screw thread (9) moving thereon while the cylinder head (5) disposed on the valve table (6) is being placed on the body (4). The cylinder head (5) whereon the valve table (6) is disposed is placed on the body (4) by being rotated. While the cylinder head (5) is being rotated, the external screw thread (9) moves over the internal screw thread (10). The length of the external screw thread (9) is almost equal to the length of the internal screw thread (10). While the cylinder head (5) is being rotated, the external screw thread (9) and the internal screw thread (10) situated oppositely interlock, providing the cylinder head (5) and the body (4) to be locked with each other. Thus, the cylinder head (5) is provided to be easily mounted on the body (4). Meanwhile, the valve table (6) remains between the cylinder head (5) and the body (4) that are fixed to each other. The valve table (6) and the cylinder head (5) are situated on the body (4) one above the other. By means of the interlocking of the external screw thread (9) and the internal screw thread (10), the body (4), the valve table (6) and the cylinder head (5) are prevented from detaching from each other until there is an additional force exerted from outside. Moreover, by means of the internal screw thread (10) and the external screw thread (9), leakage of the refrigerant through between the body (4) and the cylinder head (5) is prevented (Figure 2, Figure 3, Figure 4).
In an embodiment of the present invention, the compressor (1) comprises at least one protrusion (11) extending from the surface of the cylinder head (5) facing the valve table (6) and whereon the external screw thread (9) is situated, and furthermore at least one housing (12) situated on the body (4) and wherein the valve table (6) and the protrusion (11) are placed. When the valve table (6) and the cylinder head (5) are grouped, the valve table (6) almost completely remains inside the protrusion (11). The external screw thread (9) almost completely surrounds the outer surface of the protrusion (11) and the internal screw thread (10) almost completely surrounds the inner surface of the housing (12). While the cylinder head (5) is being rotated on the body (4), the external screw thread (9) and the internal screw thread (10) come across each other and the external screw thread (9) rotating around its own center moves over the internal screw thread (10). When the external screw thread (9) completes its movement over the internal screw thread (10), the protrusion (11) is almost completely seated into the housing (12), providing the grouping of the cylinder head (5), the valve table (6) and the body (4) (Figure 3, Figure 4).
In an embodiment of the present invention, the diameter of the valve table (6) is at least partially smaller than the diameter of the protrusion (11). The side walls of the valve table (6) placed in the protrusion (11) almost completely contact the inner surface of the protrusion (11). The valve table (6) is seated into the protrusion (11) without remaining any gap therebetween and leakage of refrigerant through between the valve table (6) and the cylinder head (5) is prevented.
In an embodiment of the present invention, the compressor (1) comprises at least one extension (13) situated on the valve table (6) and facing the cylinder head (5) when the valve table (6) is placed onto the cylinder head (5), and at least one chamber (14) situated on the cylinder head (5) and wherein the extension (13) is placed. When the valve table (6) is placed into the protrusion (11), the extension (13) is seated into the chamber (14). Thus, the cylinder head (5) is prevented from sliding off the valve table (6) (Figure 3, Figure 4).
The compressor (1) furthermore comprises a piston operating inside the cylinder (3), an inlet passage and a discharge passage arranged on the valve table (6), that provide the refrigerant fluid in the suction chamber and the exhaust chamber to enter into/exit from the cylinder (3), a suction valve leaf located on one side of the valve table (6), providing the refrigerant fluid to be sucked into the cylinder (3) by opening/closing the inlet passage during the movement of the piston and an exhaust valve leaf located on the other side of the valve table (6), providing the refrigerant fluid to be discharged from the cylinder (3) by opening/closing the discharge passage during the movement of the piston. When the extension (13) and the chamber (14) are positioned oppositely, the suction valve leaf is located across from the suction chamber and the exhaust valve leaf is located across from the exhaust chamber. By means of the extension (13) and the chamber (14), the valve leaf is properly mounted to the cylinder head (5).
In an embodiment of the present invention, the housing (12) and the protrusion (11) are circular. When the cylinder head (5) is placed onto the valve table (6), the inner surface of the housing (12) completely surrounds the outer surface of the protrusion (11).
In an embodiment of the present invention, the diameter of the housing (12) is larger than the diameter of the protrusion (11). When the cylinder head (5) is placed onto the valve table (6), the external screw thread (9) bears against the internal screw thread (10) in a matching manner.
In an embodiment of the present invention, the compressor (1) comprises at least one first sealing element (7) situated between the valve table (6) and the cylinder head (5). The diameter of the first sealing element (7) is almost equal to the diameter of the valve table (6). When the valve table (6) is placed onto the cylinder head (5), the first sealing element (7) remains between the valve table (6) and the cylinder head (5). Thus, leak-proofing is provided between the valve table (6) and the cylinder head (5).
In an embodiment of the present invention, the compressor (1) comprises at least one second sealing element (8) situated between the body (4) and the valve table (6). The second sealing element (8) is circular. The second sealing element (8) is located around the external screw thread (9). When the cylinder head (5) is placed onto the valve table (6), the second sealing element (8) remains between the cylinder head (5) and the body (4). Thus, leak-proofing is provided between the cylinder head (5) and the body (4) (Figure 4, Figure 7).
In an embodiment of the present invention, the vertical cross-sectional area of the cylinder head (5) is hexagonal. While being placed onto the body (4), the cylinder head (5) is rotated by being held with a wrench, etc. (Figure 5, Figure 6, Figure 7).
By means of the present invention, a compressor (1) is realized wherein the cylinder head (5), the valve table (6) and the body (4) are provided to be grouped without gaps remaining therebetween. Thus, the efficiency of the compressor (1) is improved, wherein leakage of the refrigerant and heat is prevented. Moreover, the cylinder head (5), the valve table (6) and the body (4) grouped by being inserted into each other provide 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 body (4) disposed inside the casing (2), that carries the cylinder (3),

- a cylinder head (5) disposed on the cylinder (3),

- a valve table (6) situated between the cylinder (3) and the cylinder head (5),
characterized by

- at least one external screw thread (9) situated on the cylinder head (5) and

- at least one internal screw thread (10) situated on the body (4), providing the grouping of the body (4), the valve table (6) and the cylinder head (5) by interlocking with the external screw thread (9) moving thereon while the cylinder head (5) disposed on the valve table (6) is being placed on the body (4).
The compressor (1) as in Claim 1, characterized by at least one protrusion (11) extending from the surface of the cylinder head (5) facing the valve table (6) and whereon the external screw thread (9) is situated, and by at least one housing (12) situated on the body (4) and wherein the valve table (6) and the protrusion (11) are placed.
The compressor (1) as in Claim 2, characterized by the valve table (6), the diameter of which is at least partially smaller than the diameter of the protrusion (11).
The compressor (1) as in any one of the above claims, characterized by at least one extension (13) situated on the valve table (6) and facing the cylinder head (5) when the valve table (6) is placed onto the cylinder head (5), and by at least one chamber (14) situated on the cylinder head (5) and wherein the extension (13) is placed.
The compressor (1) as in any one of the Claims 2 to 4, characterized by the housing (12) and the protrusion (11) that are circular.
The compressor (1) as in Claim 5, characterized by the housing (12), the diameter of which is larger than the diameter of the protrusion (11).
The compressor (1) as in any one of the above claims, characterized by at least one first sealing element (7) situated between the valve table (6) and the cylinder head (5).
The compressor (1) as in any one of the above claims, characterized by at least one second sealing element (8) situated between the body (4) and the valve table (6).
The compressor (1) as in any one of the above claims, characterized by the cylinder head (5), the vertical cross-sectional area of which is hexagonal.