WO2007017820A1

WO2007017820A1 - A compressor

Info

Publication number: WO2007017820A1
Application number: PCT/IB2006/052699
Authority: WO
Inventors: Ersin Donmez; Bogac Simsir; Emre Oguz
Original assignee: Arcelik Anonim Sirketi
Priority date: 2005-08-05
Filing date: 2006-08-04
Publication date: 2007-02-15
Also published as: TR200800419T1

Abstract

The present invention relates to a muffler head (9) – cylinder head (3) connection that provides the circulating fluid to be delivered from the suction muffler (6) to the cylinder (2) without a rise in its temperature in a hermetic compressor (1) utilized in cooling devices.

Description

Description A COMPRESSOR

[1] The present invention relates to a compressor wherein the circulating fluid is delivered from the suction muffler to the cylinder without a rise in its temperature.

[2] In the hermetic compressors utilized in the cooling devices, suction mufflers are used for delivering the circulating fluid utilized for cooling to the cylinder without heating up and for attenuating the noise that may result from the circulating fluid. The suction muffler is usually made of plastic and is connected to the cylinder head. The sucked circulating fluid passes through the muffler and through the part forming the suction chamber in the cylinder head and reaches the valve plate and the cylinder. The thermodynamic efficiency has to be enhanced at the same time while trying to minimize the noise generated during this passage. Heat transfer that affects the circulating fluid and thereby the thermodynamic efficiency occurs at the parts where the cylinder head is joined to he muffler head. In these implementations, the cylinder head is produced as a single piece and some part of the cylinder head is in contact with the surfaces of the muffler that form the suction chamber. The circulating fluid with increased temperature and pressure leaves the cylinder after the compression process at the cylinder and since it is first delivered to the exhaust chamber of the cylinder head, the temperature of the circulating fluid sucked into the cylinder rises as a result of the temperature change in the cylinder head. The rise in the temperature of the circulating fluid leads to the increase in its volume and thus a lesser amount of the circulating fluid is compressed at the same stroke volume and the volumetric capacity of the compressor is reduced.

[3] In The European Patent application no. EP195486, a cylinder head is described wherein the cylinder head has a structure that decreases areas of the surfaces contacting the muffler in order to reduce heat transfer from the cylinder head to the suction chamber.

[4] In the United States Patents no. US5908287 and US5697766, a suction muffler mounted to a portion of the cylinder head by means of a fixing member is described.

[5] In the United States Patent no. US 6641374, the structure of a cylinder head in a hermetic compressor is described. The cylinder head comprises a front head cover having a low-pressure side sucking a refrigerant and a high-pressure side discharging the refrigerant and a rear head cover combined to the rear surface of the front head cover.

[6] In the United States Patent no. US5288212, in the suction chamber of a hermetic compressor, the description is given for a suction means integrated on the suction chamber cover wherein a suction pipe is connected. [7] The aim of the present invention is the realization of a compressor with increased volumetric efficiency, providing the circulating fluid to be delivered to the cylinder without increasing its temperature at the part where the muffler and the cylinder head are connected.

[8] The compressor realized in order to attain the aim of the present invention is explicated in the attached claims.

[9] The compressor of the present invention comprises a cylinder providing the sucking and pumping of the circulating fluid, a cylinder head situated on the cylinder for guiding the sucked and pumped circulating fluid, and a suction muffler that attenuates the noise resulting from the circulating fluid and the muffler head at the suction muffler outlet is connected to the cylinder head. The muffler head extends over the cylinder head without touching it and when it is aligned with the suction hole under the cylinder head, advances towards the cylinder head by entering through the passage hole on the rear surface of the cylinder head and extending to the valve plate. The front part of the end of the muffler head that is inserted into the cylinder head contacts the periphery of the suction hole on the valve plate by a certain pressure.

[10] The muffler head is in J form, with one arm extending forward from the top plate of the suction muffler without touching the cylinder head. The elbow portion of the J shape is aligned with the suction hole covered by the cylinder head, and the arm of the J shape extends from the elbow to the cylinder head, passes through the passage hole and seats to the valve plate. The arm of the muffler head extending from the elbow to the valve plate forms the cylindrical shaped portion.

[11] There are protrusions and recesses, pin sockets and pin holes on the muffler head and around the passage hole of the cylinder head to help for the assembly and to prevent the cylinder head from being dislocated backwards.

[12] In the compressor of the present invention, the contact between the passage hole on the cylinder head and the muffler head is minimized, reducing heat transfer and the end of the muffler head is pressingly seated on the valve plate to prevent leakage of the refrigerant fluid thereby enhancing the thermodynamic efficiency.

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

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

[15] Figure 2 - is the sectional view in detail D of the compressor in Figure 1.

[16] Figure 3 - is the perspective view of a suction muffler head.

[17] Figure 4 - is the perspective view of a cylinder head.

[18] Figure 5 - is the perspective view of a suction muffler and a cylinder head before being assembled.

[19] Figure 6 - is the perspective view of a suction muffler and a cylinder head after being assembled.

[20] Elements shown in figures are numbered as follows:

[21] 1. Compressor

[22] 2. Cylinder

[23] 3. Cylinder head

[24] 4. Suction hole

[25] 5. Valve plate

[26] 6. Suction muffler

[27] 7. Rear wall

[28] 8. Passage hole

[29] 9. Muffler head

[30] 10. Recess

[31] 11. Assembly protrusion

[32] 12. Pin

[33] 13. Pin socket

[34] In cooling devices, the circulation of the circulating fluid utilized to provide cooling is preferably achieved by a hermetic reciprocating compressor (1).

[35] The compressor (1) comprises a cylinder (2) providing the suction and pumping of the circulating fluid, a cylinder head (3) situated on the cylinder (2) guiding the sucked and pumped circulating fluid, a valve plate (5) on which the cylinder head is positioned, having a suction hole (4) for delivering the circulating fluid to the stroke volume of the cylinder (2) and a suction muffler (6) providing attenuation of the noise resulting from the circulating fluid.

[36] The cylinder head (3) comprises a rear wall (7) situated opposite the valve plate (5) covering the suction and exhaust volumes within, and a passage hole (8) situated on the rear wall (7) that allows the circulating fluid to be delivered to the valve plate (5).

[37] In the embodiment of the present invention, the suction muffler (6) comprises a muffler head (9) that extends from outside the cylinder head (3) without touching it, aligning with the suction hole (4) covered by the rear wall (7), advancing to the rear wall (7) perpendicularly on the level of the suction hole (4), passing through the passage hole (8) and being seated around the suction hole (4) on the valve plate (5), having a cylindrical shape in the portion that is within the cylinder head (3). The muffler head (9) provides the circulating fluid to flow a considerable amount of the distance from the suction muffler (6) to the valve plate (5) without contacting the cylinder head (3) and thus heat transfer to the circulating fluid is being reduced.

[38] The muffler head (9) has a J shape. One arm of the J shape forms the portion fixed to the cylinder and extending out from the cylinder head (3). The elbow part of the J shape is aligned with the suction hole (4) covered by the cylinder head (3) and is outside the cylinder head (3). The other arm of the J shape, having a cylindrical shape, passes through the passage hole (8) and extends from the elbow to the valve plate (5).

[39] The muffler head (9), passing through the passage hole (8) extends to the valve plate (5) and the ring shaped surface (Y) at its end presses on around the suction hole (4) and is seated on the valve plate (5). Accordingly the leakage of the circulating fluid is prevented. Since the muffler head (9) extends to the valve plate (5) perpendicularly, only the ring shaped surface (Y) at its end contacts the valve plate (5) and heat transfer from the valve plate (5) to the circulating fluid is reduced.

[40] By way of the portion of the muffler head (9) inside the cylinder head (3) being shaped as a straight pipe, a regular flow of the circulating fluid is provided and the circulating fluid entering into the cylinder head (3) without having to change direction, reaches directly the valve plate (5) and the cylinder (2) and consequently the pressure losses are reduced.

[41] The passage hole (8) provides housing of the muffler head (9) and the muffler head

(9) to be seated on the valve plate (5) by centering the suction hole (4) and prevents the muffler head (9) from sliding out of the suction hole (4). The passage hole (8) opens opposite the suction hole (4) so that the outlet orifice of the muffler head (9) is aligned with the suction hole (4) on the valve plate (5).

[42] The cylinder head (3) comprises one or more recesses (10), situated around the passage hole (8) reducing the surface area of the walls of the passage hole (8) contacting the muffler head (9). When the muffler head (9) is housed by passing through the passage hole (8), it contacts only the walls of the passage hole (8) between the recesses (10) and the heat transfer between the cylinder head (3) and the muffler head (9) is reduced.

[43] In another embodiment of the present invention, the muffler head (9) comprises one or more assembly protrusions (11) situated around it that enable it to be fitted in the passage hole (8) by passing through the recesses (10) and one or more pins (12) situated on the assembly protrusions (11) providing the muffler head (9) to be fixed to the rear wall (7).

[44] In this embodiment the cylinder head (3) comprises one or more pin sockets (13) situated on the inner surface of the rear wall (7), providing the pins (12) to be firmly fitted inside and the muffler head (9) to be undisplacably fixed on the rear wall (7). The recesses (10) situated around the passage hole (8) of the cylinder head (3) also provide the assembly protrusions (11) to be inserted inside when the muffler head (9) is being mounted.

[45] While the muffler head (9) is being mounted on the rear wall (7) of the cylinder head (3), the assembly protrusions (11) are inserted through the recesses (10) and the muffler head (9) is turned around its axis a little so that the pins (12) on the assembly protrusions (11) correspond with the pin sockets (13) on the inner surface of the rear wall (7). After the pins (12) and the pin sockets (13) are aligned with each other, the muffler head (9) is pulled back a little providing the pins (12) to be firmly inserted in the pin sockets (13).

[46] In the embodiment of the present invention, a better leak-proofing is provided between the ring-like surface (Y) at the end of the muffler head (9) and the valve plate (5), and leakage of the circulating fluid is prevented since the muffler head (9) is fixed to the cylinder head (3) by means of the pins (12) and the pin sockets (13) on the inner surface of the rear wall (7) so that it can't be displaced towards the rear.

[47] By way of the embodiment of the present invention, in the compressor (1), the flow regularity of the circulating fluid in the cooling cycle and leak-proofing is provided, preventing the pressure losses, and the thermodynamic efficiency is enhanced by reducing the heat transfer to the circulating fluid.

Claims

[1] A compressor (1) comprising a cylinder (2) providing the suction and pumping of the circulating fluid, a cylinder head (3) situated on the cylinder (2) guiding the sucked and pumped circulating fluid, a valve plate (5) on which the cylinder head is positioned, having a suction hole (4) for delivering the circulating fluid to the stroke volume of the cylinder (2) and a suction muffler (6) providing attenuation of the noise resulting from the circulating fluid and characterized by a suction muffler (6) that :

- comprises a rear wall (7) situated opposite the valve plate (5) covering the suction and exhaust volumes within,

- comprises a cylinder head (3) situated on the rear wall (7) having a passage hole (8) that allows the circulating fluid to be delivered to the valve plate (5) and,

- comprises a muffler head (9),

- that extends from outside the cylinder head (3) to the level of the suction hole (4) covered by the rear wall (7) without touching the cylinder head (3),

- advancing towards the rear wall (7) perpendicularly on the level of the suction hole (4),

- passing through the passage hole (8) and being seated around the suction hole (4) on the valve plate (5) and,

- having a cylindrical shape in the portion that is within the cylinder head (3).

[2] A compressor (1) as in claim 1, characterized by a suction muffler (6) comprising a muffler head (9) that has a J shape, with one arm of the J shape, forming the portion fixed to the suction muffler (6) and extending outside the cylinder head (3), the elbow part of the J shape being aligned with the suction hole (4) covered by the cylinder head (3) and the other arm of the J shape that is outside the cylinder head (3), having a cylindrical shape, that passes through the passage hole (8) and extends from the elbow to the valve plate (5).

[3] A compressor (1) as in claim 1, characterized by a suction muffler (6) comprising a muffler head (9) having the ring-like surface (Y) at its end seated on the valve plate (5) by pressing around the suction hole (4).

[4] A compressor (1) as in any one of the above claims, characterized by a cylinder head (3) comprising a passage hole (8) ) that opens opposite the suction hole (4) so that the outlet orifice of the muffler head (9) aligns with the suction hole (4) on the valve plate (5) and provides the muffler head (9) to be seated on the valve plate (5) by centering the suction hole (4).

[5] A compressor (1) as in claim 1, characterized by a suction muffler (6) comprising a cylinder head (3) having one or more recesses (10), situated around the passage hole (8) that reduce the surface area of the walls of the passage hole (8) contacting the muffler head (9) and a muffler head (9) having one or more assembly protrusions (11) that enable it to be fitted in the passage hole (8) by passing through the recesses (10).

[6] A compressor (1) as in claim 5, characterized by a suction muffler (6) comprising a muffler head (9) having one or more pins (12) situated on the assembly protrusions (11) providing the muffler head (9) to be fixed to the rear wall (7).

[7] A compressor (1) as in claim 6, characterized by a cylinder head (3) comprising one or more pin sockets (13) situated on the inner surface of the rear wall (7), providing the pins (12) to be firmly fitted inside and the muffler head (9) to be fixed on the rear wall (7) so that the muffler head (9) can't be displaced towards the rear.