WO2019129432A1

WO2019129432A1 - A hermetic compressor

Info

Publication number: WO2019129432A1
Application number: PCT/EP2018/082043
Authority: WO
Inventors: Ahmet Refik Ozdemir; Caglar SAHIN; Fikri CAVUSOGLU; Yunus KOSE
Original assignee: Arcelik Anonim Sirketi
Priority date: 2017-12-26
Filing date: 2018-11-21
Publication date: 2019-07-04
Also published as: TR201721861A2

Abstract

The present invention relates to a compressor (1) enabled to be effectively cooled during its operation, characterized by the valve plate (3) having at least one slot (31), and by at least one heat pipe (4) contacting the valve plate (3) by entering into the slot (31 ) provided on the valve plate (3), and receiving and distributing the heat on the valve plate (3).

Description

[Title established by the ISA under Rule 37.2] A HERMETIC COMPRESSOR

Technical Field

The present invention relates to a compressor used particularly in refrigerators, with improved operational efficiency.

Prior Art

In hermetic compressors used particularly in refrigerators, a coolant from an evaporator is received into a housing of the compressor by means of a suction pipe provided out of the housing, and then passes through a suction muffler and reaches a cylinder. Said coolant is compressed in the cylinder and its temperature rises during this compression. This causes heat to be transferred from the cylinder region inwards the housing. In cases when the cylinder is not sufficiently cooled, the inlet power of the compressor increases, thereby reducing its performance. The highest temperatures in a compressor occur in the cylinder, in the vicinity of the suction port, at the valve plate and exhaust plenum. The high temperatures in these regions increase the thermodynamic losses of the compressor, thereby reducing the coefficient of performance (COP). The coolant entering from the inlet of the suction muffler to the muffler, follows the pipe line disposed in the muffler and heads towards the suction plenum. The coolant with a low temperature and pressure, is received from the suction plenum to the interior of the cylinder block by means of the suction port. The gas compressed in the cylinder block by means of a piston and thus reaching a high temperature and pressure, is received into the exhaust plenum upon opening of the exhaust valve. Said gas is then sent out of the housing by means of an exhaust line disposed on the compressor body.

Since the hermetic compressors comprise multiple movable parts, lubrication is made in order to inhibit abrasion of the parts and to avoid a reduction in the compressor performance due to friction based raised temperatures. A lubrication hole is provided at the lower end of a crank shaft in the state of the art hermetic compressors to enable lubrication. The oil provided in a lower housing of the compressor moves upwards from the lubrication hole due to centrifugal effect occurring as a result of the rotational motion of the rotor and the crank during operation. The oil moving due to the helical structure of the lubrication groove and the centrifugal effect, exits from the lubrication grooves disposed on present bearings and lubricate these regions. In case of imperfect lubrication, the mechanical parts become abraded by rubbing against each other and decrease the efficiency of the compressor by heating up.

State of the art Japanese patent document no. JP2002048066 mentions a structure enabling cooling a cylinder head. In said structure, baffles are provided on the condenser end of a heat pipe.

State of the art Japanese patent document no. JP3175194 mentions a structure enabling cooling a cylinder head. In said document, an end of a heat pipe is placed into a hole bored in the cylinder, and the other end of the heat pipe is left out of the housing.

None of the state of the art documents include a solution such as the one in the present invention.

Brief Description of the Invention

The aim of the present invention is to realize a compressor used particularly in refrigerators, with improved operational efficiency.

Another aim of the present invention is to realize a compressor enabled to be effectively cooled during its operation.

Detailed Description of the Invention

The compressor realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:
Figure 1: is a sectional view of the compressor in an embodiment.
Figure 2: is a view of the heat pipe bent upwards.
Figure 3: is a view of the heat pipe bent downwards.

The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.

Compressor
Housing
Valve plate
31. Slot
Heat pipe
41. Evaporator region
42. Condenser region
43. Baffle

In its most basic form, the compressor (1) enabled to be effectively cooled during its operation, comprises

at least one housing (2) capable of retaining oil to enable lubrication of the parts accommodated therein,
at least one valve plate (3) having at least one slot (31), accommodating the suction and exhaust valves and the sealing members, and
at least one heat pipe (4) having at least one evaporator region (41) capable of contacting the valve plate (3) by entering into the slot (31) provided on the valve plate (3), thus receiving the heat on the valve plate (3), at least one condenser region (42) enabling a coolant evaporating by the heat in the evaporator region (41) to shift back to the liquid phase, and at least one baffle (43) increasing the amount of the transferred heat by increasing the contact surface on the condenser region (42).

In its most basic form, the compressor (1) enabled to be effectively cooled during its operation, comprises at least one housing (2) capable of retaining oil to enable lubrication of the parts accommodated therein. Said housing (2) preferably comprises at least two parts, namely a lower and an upper part (only the lower part is shown in the figures). The lower and the upper parts form an enclosed volume by joining. Preferably oil is filled in said enclosed volume. The parts of the compressor (1) are thus enabled to be lubricated, thereby reducing their abrasion during operation. One or more parts of the compressor (1) such as the suction and the exhaust valves, the sealing members, etc. are connected to the valve plate (3). Therefore, the heat emitted during operation of these parts is transmitted also to the valve plate (3). The compressor (1) of the invention comprises at least one heat pipe (4) to discharge the heat on the valve plate (3). A coolant is provided in the internal volume of the heat pipe (4). The heat pipe (4) comprises an evaporator region (41) capable of contacting at least the valve plate (3), receiving the heat on the valve plate (3). The coolant evaporates by the heat on the evaporator region (41) and moves to the condenser region (42). The heat of the coolant is dissipated to the environment in the condenser region (42). At least one baffle (43) is provided in the condenser region (42) enabling increasing the contact surface and therefore the amount of the transferred heat. At least one slot (31) is provided on the valve plate (3), into which the evaporator region (41) of the heat pipe (4) can enter. The thicknesses of the evaporator region (41) and the valve plate (3) are almost identical. The contact surface between the evaporator region (41) and the slot (31) increases when the evaporator region (41) enters into the slot (31), and the evaporator region (41) and the slot (31) have a more integrated structure thanks to having an identical thickness.

In an embodiment of the invention, the heat pipe (4) is bent towards the upper portion of the housing (2) and exchanges heat with the air therein. The heat pipe (3) vibrates due to the vibrations occurring during operation of the compressor (1). The air around the baffles (43) is thus moved, thereby increasing the convection coefficient. Although air is referred to herein, it is clear that any available gas may be moved in the housing (2).

In an embodiment of the invention, the condenser region (42) and the baffles (43) of the heat pipe (4) are positioned so as to be submerged into the oil in the housing (2). The coolant in the heat pipe (4) can thus give its heat into the oil. Also the heat pipe (3) vibrates due to the vibrations occurring during operation of the compressor (1). The oil around the baffles (43) is thus moved, thereby increasing the convection coefficient.

In the compressor (1) of the invention, the parts heating during operation such as the valve plate (3), suction port, exhaust plenum and cylinder are cooled thanks to the heat pipe (4) drawing heat from the valve plate (3). The operational efficiency of the compressor (1) is thus increased.

Claims

A compressor (1) enabled to be effectively cooled during its operation, comprising

- at least one housing (2) capable of retaining oil to enable lubrication of the parts accommodated therein, and

- at least one valve plate (3) to accommodate the suction and exhaust valves and the sealing members, characterized by

- the valve plate (3) having at least one slot (31), and by

- at least one heat pipe (4) having at least one evaporator region (41) capable of contacting the valve plate (3) by entering into the slot (31) provided on the valve plate (3), thus receiving the heat on the valve plate (3), at least one condenser region (42) enabling a coolant evaporated by the heat in the evaporator region (41) to shift back to the liquid phase, and at least one baffle (43) increasing the amount of the transferred heat by increasing the contact surface on the condenser region (42).
A compressor (1) according to claim 1, comprising the heat pipe (4) having an evaporator region (41) whose thickness is almost identical to that of the valve plate (3).
A compressor (1) according to claim 1, comprising the heat pipe (4) bending towards the upper portion of the housing (2) and exchanging heat with the air therein.
A compressor (1) according to claim 3, comprising the heat pipe (4) vibrating due to the vibrations occurring during operation of the compressor (1), thereby increasing its convection coefficient by moving the air around the baffles (43).
A compressor (1) according to claim 1, wherein the condenser region (42) and the baffles (43) are positioned so as to be submerged into the oil in the housing (2).
A compressor (1) according to claim 5, comprising a heat pipe (4) vibrating due to the vibrations occurring during operation of the compressor (1), thereby increasing its convection coefficient by moving the oil around the baffles (43).