JP2012172918A - Refrigerant liquid forced circulation type refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant liquid forced circulation type refrigeration system that prevents fluid from being distributed at an unintentional rate as a refrigerant to a plurality of cooling coils of a heat exchanger, excludes uneven heat exchange, and simplifies air conditioning control.SOLUTION: In a refrigerant liquid forced circulation type refrigeration system which forms a refrigeration or heat pump cycle by a refrigeration cycle including a refrigerant compressor 11, a condenser 12, an expansion valve 14, a low pressure receiver 15, a heat exchanger 16 having a plurality of cooling coils 16a, and a refrigerant liquid pump 19 for feeding the heat exchanger 16 with a refrigerant liquid, the refrigeration system includes one refrigerant inflow port connected with a refrigerant pipe 17a on the refrigerant liquid pump 19 side on one end thereof, a plurality of refrigerant outflow ports respectively connected with the plurality of cooling coils 16a on the other ends thereof, and a distributor 18 for liquid-distributing the refrigerant liquid flown in from the refrigerant inflow port to each refrigerant outflow port under an equal pressure is provided.

Description

  The present invention relates to a refrigerant liquid forced circulation type refrigeration system, and more particularly to a refrigerant liquid forced circulation type refrigeration system in which refrigerant can be evenly divided into a plurality of cooling coils.

  Generally, a heat exchanger of a refrigerant liquid forced circulation refrigeration system is connected to a plurality of cooling coils arranged in parallel to each other, a large number of heat transfer fins in contact with each cooling coil, and one end of each cooling coil. A header type flow divider is used to divert the refrigerant liquid flowing from the refrigerant liquid pump into the flow divider to each cooling coil, and to exchange heat between the refrigerant liquid flowing in each cooling coil and external air. What is performed through a fin is known (for example, refer to Patent Document 1).

  The header type shunt is made of a hollow member such as a copper pipe or an aluminum pipe, and the cooling coils and the refrigerant pipes on the refrigerant liquid pump side are connected to the side surfaces thereof.

JP2001-133308A.

  However, the header type flow divider made of a hollow member causes a fluid drift when flowing into the flow divider from the refrigerant liquid pump, and the ratio of unintended pressures at a plurality of refrigerant outlets due to the influence of this drift etc. However, the refrigerant cannot be divided evenly or in an intended ratio with respect to the plurality of cooling coils. In addition, there is a problem that air conditioning control is difficult due to uneven heat exchange due to uneven refrigerant. In addition, depending on the construction method of the piping, there are problems that a gas lock occurs and the refrigerating capacity cannot be sufficiently exhibited, and that refrigerating machine oil accumulates in the cooling coil and the refrigerating capacity cannot be sufficiently exhibited.

  Therefore, a refrigerant liquid forced circulation system that prevents the fluid from diverting at an unintended ratio to the plurality of cooling coils of the heat exchanger, eliminates heat exchange unevenness, and simplifies air conditioning control. The technical problem which should be solved in order to provide a refrigeration system arises, and this invention aims at solving this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 has a refrigerant compressor, a condenser, an expansion valve, a low-pressure receiver, and a plurality of cooling coils. In the refrigerant liquid forced circulation type refrigeration system in which a refrigeration cycle including a heat exchanger and a refrigerant liquid pump that supplies refrigerant liquid to the heat exchanger forms a refrigeration or heat pump cycle, one end side of the refrigerant liquid pump side A refrigerant inlet connected to the refrigerant pipe, a plurality of refrigerant outlets connected to the cooling coils on the other end, respectively, and the refrigerant liquid flowing in from the refrigerant inlet Provided is a refrigerant liquid forced circulation refrigeration system provided with a distributor that distributes liquid at an equal pressure to each refrigerant outlet.

  According to this configuration, the distributor provided between the heat exchanger and the refrigerant liquid pump controls the refrigerant liquid flowing in from the refrigerant pipe on the refrigerant liquid pump side to be even and distributes it to the cooling coil side. Therefore, it is possible to prevent the fluid from diverting to the respective cooling coils at an unintended ratio.

  According to a second aspect of the present invention, there is provided a refrigerant liquid forced circulation type refrigeration system in which the cooling coil and the refrigerant outlet are connected via a capillary tube in the configuration of the first aspect.

  According to this configuration, since the refrigerant flowing out from the refrigerant outlet of the distributor is supplied to the respective cooling coils through the capillary tubes, it is possible to further counteract the influence of the drift with the caterpillar tubes.

  According to a third aspect of the present invention, in the configuration according to the first or second aspect, the refrigerant liquid forced circulation type refrigeration in which the refrigerant outlet of each of the cooling coils of the heat exchanger is connected to a header leading to the liquid receiver. To provide a system.

  According to this configuration, the refrigerant that has passed through the refrigerant outlet of each cooling coil can be smoothly returned to the liquid receiver through the header.

  According to the first aspect of the present invention, the refrigerant provided between the heat exchanger and the refrigerant liquid pump can prevent the refrigerant from diverting to the respective cooling coils at an unintended ratio. This eliminates uneven heat exchange, eliminates temperature unevenness at the air outlet temperature, eliminates the occurrence of gas locks and pools of refrigerating machine oil, and improves the refrigerating capacity.

  In the invention according to claim 2, the refrigerant flowing out from the refrigerant outlet of the distributor is supplied to each cooling coil side through the capillary tube, and the pressure of the refrigerant can be made more uniform with this caterpillar tube. In addition to the effect described in 1, it is possible to further prevent the refrigerant from diverting at an unintended ratio.

  In the invention according to claim 3, the refrigerant that has passed through the refrigerant outlet of each cooling coil can be smoothly returned to the liquid receiver through the header.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the Example of the refrigerant liquid forced circulation type refrigeration system to which this invention is applied. The top view of the cooling coil of a system same as the above. The side view of the cooling coil of a system same as the above. The side view of the distributor in a refrigerant liquid forced circulation type refrigerating system same as the above. AA sectional drawing of FIG.

  The present invention achieves the object of preventing fluid from diverting at an unintended ratio with respect to a plurality of cooling coils of a heat exchanger, eliminating heat exchange unevenness, and simplifying air conditioning control. A refrigerant compressor, a condenser, an expansion valve, a low-pressure receiver, a heat exchanger having a plurality of cooling coils, and a refrigerant liquid pump that supplies the refrigerant liquid to the heat exchanger. In the refrigerant liquid forced circulation refrigeration system in which a refrigeration cycle forms a refrigeration or heat pump cycle, the refrigerant liquid has one refrigerant inlet connected to the refrigerant pipe on the refrigerant liquid pump side on one end side, and A distributor having a plurality of refrigerant outlets connected to a plurality of cooling coils and distributing liquid equally to the refrigerant outlets from the refrigerant inlets is provided. It was realized by.

  Hereinafter, a preferred example of a refrigerant liquid forced circulation refrigeration system according to an embodiment of the present invention will be described in detail based on the drawings as a case where it is applied to an environmental test apparatus for performing an environmental test of an automobile indoors.

  FIG. 1 is a schematic configuration diagram showing a refrigerant liquid forced circulation refrigeration system according to the present invention. In the figure, the refrigeration system 10 has a circulating refrigerant circuit including a refrigerant compressor 11, a condenser 12, a high-pressure receiver 13, an expansion valve 14, a low-pressure receiver 15, an evaporator 16, and the like. Yes.

  More specifically, in the refrigerant pipe 17a connecting the evaporator 16 and the low-pressure receiver 15, the refrigerant liquid in the low-pressure receiver 15 is distributed to the cooling coil 16a in the evaporator 16 to the distributor 18. There is provided a refrigerant liquid pump 19 that is supplied via the. The refrigerant exchanged by the cooling coil 16a in the evaporator 16 is returned to the low-pressure receiver 15 through the header 25 and the refrigerant pipe 17b. Two or more refrigerant compressors 11 are provided.

  The refrigerant pipe 17c that connects the low-pressure receiver 15 and the refrigerant compressor 11 is provided with a regulating valve 20, and connects the high-pressure receiver 13 and the low-pressure receiver 15. A stop valve 21 and the expansion valve 14 are provided in the refrigerant pipe 17f. The low-pressure receiver 15 and the high-pressure receiver 13 are provided with liquid level sensors 22 and 23 for detecting the amount of refrigerant liquid in the low-pressure receiver 15 and the high-pressure receiver 13, respectively. It has been.

  As shown in FIGS. 2 and 3, the evaporator 16 includes a plurality of independent refrigerants each formed by a heat transfer tube made of copper or aluminum and a plurality of heat transfer fins 16b in contact with the heat transfer tube. The cooling coils 16a, 16a,... Forming the passage are provided side by side. More specifically, four cooling coils 16a, 16a,... In the present embodiment are provided. Each of the cooling coils 16a, 16a,... Has a straight portion and a curved portion that are parallel to each other, and has a shape meandering in a substantially horizontal direction, so that the refrigerant flows while exchanging heat with air. Constitutes the road.

  The header 25 is formed in a slightly thick annular shape with both ends closed. The header 25 is disposed on the side of the evaporator 16 in such a posture that its axial direction is the vertical direction. Further, a refrigerant outlet portion (not shown) of each of the cooling coils 16a, 16a,... Is connected to a refrigerant inlet portion (not shown) formed on the side surface of the header 25. The refrigerant pipe 17b connected to the low-pressure receiver 15 is connected to the refrigerant outlet.

  As shown in FIGS. 4 and 5, the distributor 18 is provided with one refrigerant inlet 18a on one end side and a plurality (four in this example) of refrigerant outlets 18b, 18b. ing. Further, the distributor 18 is formed in an annular shape by providing a conical protrusion 18c protruding from the refrigerant outflow side into the refrigerant inlet 18a at a portion facing the refrigerant inlet 18a. A space portion 28 is formed. The refrigerant outlets 18b, 18b,... Are provided at substantially equal intervals on the refrigerant outflow side of the space portion 28, and one ends of capillary tubes 27, 27 ... are connected to the refrigerant outlets 18b, 18b, respectively.

  The capillary tubes 27, 27... Are copper capillaries each having an inner diameter of about 0.7 to 2.5 mm, and the other end sides are connected to the refrigerant inlets of the plurality of cooling coils 16a, 16a, respectively.

  Therefore, in the distributor 18 configured in this way, the refrigerant that has flowed into the space 27 from the refrigerant inflow port 18a once hits the conical protrusion 18c, and the protrusion 18c causes the refrigerant to flow. The effect of current drift is negated. Then, by canceling the influence of this drift, the refrigerant flowing out from the refrigerant outlets 18b, 18b,... Can be evenly divided. The shape of the space 27 may not be a shape provided with the conical protrusion 18c as long as the influence of the drift of the refrigerant can be canceled.

  Further, the cooling coils 16a, 16a,... Are not directly connected to the refrigerant outlets 18b, 18b,... Of the distributor 18, so that the refrigerant is supplied to the cooling coil 26 side through the capillary tube 27. Therefore, the distribution of the refrigerant flowing out from the refrigerant outlets 18b, 18b... Of the distributor 18 and flowing into the cooling coils 16a, 16a.

  Next, the overall operation of the refrigeration system 10 configured as described above will be described with reference to FIG. First, the refrigerant liquid discharged from the high-pressure receiver 13 to the refrigerant pipe 17 f is vaporized under reduced pressure by the expansion valve 14 and introduced into the low-pressure receiver 15 from above.

  Further, the vaporized refrigerant in the low-pressure receiver 15 is sucked into the compressor 11 via the regulating valve 20 and compressed. The compressed gas is sent to the condenser 12 through the refrigerant pipe 17d, and heat is exchanged with the cooling water 24 in the condenser 12 to condense and liquefy, and change from a gas state to a liquid state.

  The refrigerant liquid liquefied in the condenser 12 is introduced into the high-pressure liquid receiver 13 from above through the refrigerant pipe 17e.

  On the other hand, when the refrigerant liquid pump 19 is driven, the evaporator 16 is supplied with a low-pressure refrigerant liquid from the low-pressure receiver 15 via the refrigerant pipe 17a, and the refrigerant liquid is supplied to the distributor. 18 and the capillary tubes 27, 27... Are equally distributed to the cooling coils 16a, 16a.

  The refrigerant liquid is evaporated when it passes through the cooling coil 16a in the evaporator 16, and the heat of vaporization cools the air flowing through the evaporator 16 into the air-conditioned room. The refrigerant gas that has changed from the liquid state to the gas state in the evaporator 16 and contributed to cooling is introduced from the header 25 into the low-pressure receiver 15 through the refrigerant pipe 17b from above. .

  Therefore, in the refrigeration system according to this embodiment, the above operation is repeated as necessary, so that the evaporator 16 and the condenser 12 have a predetermined temperature, for example, in the range of −50 ° C. to 50 ° C. Temperature control can be performed with one liquid refrigerant.

  Therefore, in the refrigeration system according to this embodiment, the refrigerant sent to the evaporator 16 by the refrigerant liquid pump 19 is uniformly divided by the distributor 18 and the capillary tubes 27, 27. , 16a... Can be prevented from being diverted at an unintended ratio. Thereby, heat exchange unevenness can be eliminated and air conditioning control can be simplified.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  As described above, the present invention is not limited to the air conditioning of the air-conditioned room in the environmental test apparatus, and can be applied to a general refrigeration system.

DESCRIPTION OF SYMBOLS 10 Refrigerating system 11 Refrigerant compressor 12 Condenser 13 High pressure receiver 14 Expansion valve 15 Low pressure receiver 16 Evaporator 16a Cooling coil 17a Refrigerant pipe 17b Refrigerant pipe 17c Refrigerant pipe 17e Refrigerant pipe 18 Distributor 18a Refrigerant inlet 18b Refrigerant flow Outlet 18c Protrusion 19 Refrigerant liquid pump 20 Regulating valve 21 Stop valve 22 Liquid level sensor 23 Liquid level sensor 24 Cooling water 25 Header 26 Cooling coil 27 Capillary tube 28 Space

Claims (3)

By a refrigeration cycle including a refrigerant compressor, a condenser, an expansion valve, a low-pressure receiver, a heat exchanger having a plurality of cooling coils, and a refrigerant liquid pump that supplies the refrigerant liquid to the heat exchanger, In the refrigerant liquid forced circulation refrigeration system forming a refrigeration or heat pump cycle,
One refrigerant inflow port connected to the refrigerant pipe on the refrigerant liquid pump side on one end side, and a plurality of refrigerant outflow ports respectively connected to the plurality of cooling coils on the other end side, A refrigerant liquid forced circulation type refrigeration system comprising a distributor that equally distributes a liquid refrigerant flowing in from an inlet to each of the refrigerant outlets.   The refrigerant liquid forced circulation refrigeration system according to claim 1, wherein the cooling coil and the refrigerant outlet are connected via a capillary tube.   The refrigerant liquid forced circulation type refrigeration system according to claim 1 or 2, wherein a refrigerant outlet of each cooling coil of the heat exchanger is connected to a header leading to the low pressure receiver.

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