JPH0225091Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a refrigeration cycle that reduces the pressure loss of refrigerant discharged from a compressor.

[Technical background of the invention and its problems]

In the refrigeration cycle, the refrigerant discharged from the compressor flows almost in a gas state until it reaches the condenser, and when it reaches the condenser, it radiates heat and begins to flow while condensing. However, in the past, the pipes from the compressor to the condenser had the same diameter as the pipes that made up the condenser, so although the flow rate of the refrigerant was low in the condenser where it was flowing while condensing, the pipes from the compressor to the condenser where it was flowing in almost a gaseous state. Since the flow rate of the refrigerant is quite fast in the pipe, the pressure loss of the refrigerant in the pipe is large.
There was a problem that the efficiency of the refrigeration cycle as a whole decreased.

[Purpose of invention]

This idea was made in view of the above circumstances.
The purpose is to provide a refrigeration cycle that can improve efficiency by reducing the pressure loss of refrigerant in the pipeline from the compressor to the condenser.

[Summary of the idea]

In the present invention, the pipe line between the discharge port of the compressor and the condenser that condenses the refrigerant sent from the compressor side and sends it to the cooler is formed by a pipe having a diameter larger than that of the pipe constituting the condenser. A plurality of heat dissipation tubes are arranged in parallel to reduce the flow velocity of refrigerant in the conduit leading to the condenser, thereby reducing pressure loss.

[Example of idea]

An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a compressor that discharges refrigerant compressed in a cylinder into an outer case.A delivery pipe 2 is connected to the discharge port 1a of the compressor 1, and two parallel pipes are connected to each other, with the exits of the delivery pipe 2 being connected in parallel. It is connected to a common inlet of the heat radiation pipes 3 and 4. Then, the common outlet of both heat radiation pipes 3 and 4 is connected to the inlet of a cooling pipe 6 provided inside the outer case of the compressor 1 via a connecting pipe 5, and the outlet of this cooling pipe 6 is connected to the inlet of a condenser 7. are doing. In this way, the pipes (delivery pipe 2, heat dissipation pipe 3,
4, the connecting pipe 5, and the cooling pipe 6), the heat dissipation pipes 3 and 4, which account for most of them, are pipes having a larger diameter than the pipe constituting the condenser 7. Note that the delivery tube 2 and the connecting tube 5 may have the same diameter as the heat dissipation tubes 3 and 4, or may have the same diameter as the tube constituting the condenser 7. 8 is a cooler, and the inlet of the cooler 8 is connected to the outlet of the condenser 7 via a capillary tube 9 and a differential pressure valve 10, and the outlet of the cooler 8 is connected to a check valve 11.
It is connected to the suction port 1b of the compressor 1 via a suction pipe 12. The differential pressure valve 10 is
It is connected to the suction pipe 12 via a communication pipe 13, and is opened by the pressure difference between the suction side and the discharge side that occurs when the compressor 1 is in operation, thereby establishing communication between the condenser 7 and the capillary tube 9.
The differential pressure valve 10 and the check valve 11 function to prevent the high temperature refrigerant in the condenser 7 from flowing into the cooler 8 when the compressor 1 is stopped.

In the above configuration, when the compressor 1 is started, the refrigerant compressed by the compressor 1 is supplied to the heat radiation pipes 3 and 4 via the delivery pipe 2, where it radiates heat and partially liquefies. This refrigerant flows into the cooling pipe 6 via the connecting pipe 5, where the liquid refrigerant evaporates to cool the compressor 1, and then the condenser 7
flow inside. The refrigerant that has flowed into the condenser 7 is condensed and liquefied, flows into the cooler 8 via the differential pressure valve 10 and the capillary tube 9, and evaporates. The air is drawn into the compressor 1 through the air.

By the way, in the condenser 7, the refrigerant is almost completely liquefied as it flows through the condenser 7, so it flows at a relatively low speed. However, in the conduit from the compressor 1 to the condenser 7, especially in the heat dissipation tubes 3 and 4 which occupy most of the conduit, the refrigerant flows mostly in a gaseous state, although some of the refrigerant liquefies.
Therefore, if the diameter of the heat dissipation tube is the same as that of the condenser, the velocity of the refrigerant flowing through the heat dissipation tube will be high, resulting in a considerably large pressure loss. Since it is made larger than the diameter, and a part of the refrigerant is liquefied by heat radiation, the flow velocity of the refrigerant in the heat radiation pipes 3 and 4 is lowered, and the pressure loss of the refrigerant in the heat radiation pipes 3 and 4 is accordingly reduced. , the efficiency of the entire refrigeration cycle is improved. Moreover, since the two heat radiation pipes 3 and 4 are provided in parallel, the amount of refrigerant flowing through each heat radiation pipe 3 and 4 is about half of the amount of refrigerant discharged from the compressor 1, and the flow rate of the refrigerant is further increased. pressure loss can be reduced. Furthermore, by increasing the diameters of the heat dissipation tubes 3 and 4, the surface area thereof also increases, improving heat dissipation, and the amount of liquefied refrigerant increases accordingly, making it possible to cool the compressor 1 more reliably.

Although the cooling pipes 6 are provided in the above embodiment, these are for cooling the compressor 1 and do not necessarily have to be provided.

[Effect of idea]

As is clear from the above description, in the present invention, the conduit from the compressor to the condenser is constructed by providing in parallel a plurality of heat dissipation tubes each having a diameter larger than that of the tube constituting the condenser.
Even if the refrigerant flows mostly as a gas from the compressor to the condenser, the pipe diameter of the heat radiation pipes must be large, and the amount of refrigerant flowing through each heat radiation pipe must be less than half the discharge amount of the compressor.
Part of the refrigerant liquefies due to heat dissipation in the heat dissipation tube,
For these reasons, the flow velocity of the refrigerant in the heat dissipation tubes can be considerably lowered, which has the excellent effect of reducing pressure loss and improving the efficiency of the refrigeration cycle as a whole. .

[Brief explanation of the drawing]

The drawing is a refrigeration cycle diagram showing an embodiment of the present invention. In the figure, 1 is a compressor, 3 and 4 are heat sinks, and 7
is a condenser, and 8 is a cooler.

Claims (1)

[Scope of utility model registration request] The conduit between the discharge port of the compressor and the condenser that condenses the refrigerant sent from the compressor side and sends it to the cooler is a heat dissipation tube formed by a tube with a larger diameter than the tube constituting the condenser. A refrigeration cycle characterized by being configured by providing multiple units in parallel.