JP2586412B2 - Refrigeration cycle heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat exchanger of a refrigeration cycle for exchanging heat between water and a refrigerant.

[Related Art] There is a type of refrigeration cycle used for ships and the like, in which water or seawater exchanges heat with a refrigerant to perform indoor cooling or heating.

The heat exchanger 100 used for this type of refrigeration cycle
Conventionally, for example, as shown in FIG. 7, a case provided with a cylindrical body 101 having a chamber therein and a lid 102, and a water or seawater inlet 103 and a water drain 104 at both ends of the cylindrical body 101 105
And a tube 106 serving as a flow path for the refrigerant that is spirally swirled in the case 105 and accommodated therein, and a middle tube 107 inserted inside the spiral tube 106. In the tube 106 housed in the case 105, a linear portion 106a rises from the bottom side (the lower side in the figure) of the tubular body 101, and the linear portion 106a is connected to the outside of the spiral portion 106b of the tube 106 and the tubular body 101. And was guided to the refrigerant discharge port 109 through the gap between the inner peripheral surface of the refrigerant and the inner peripheral surface of the refrigerant.

[Problems to be Solved by the Invention] According to the conventional technique described above, the linear portion 106a of the tube 106 guided to the refrigerant outlet 109 is formed by the spiral portion 106b of the tube 106 from the bottom side of the cylindrical body 101. Therefore, a space for guiding the linear portion 106a of the tube 106 is required between the outer periphery of the spiral portion 106b of the tube 106 and the inner peripheral surface of the cylindrical body 101. As a result, the volume of water flowing in the case 105 is increased, so that the flow rate of water or seawater flowing in the case 105 is low, and the heat exchange efficiency is poor.

Also, since the outer diameter of the case 105 becomes large, the heat exchanger 1
In addition to the increase in the weight of the 00, there is a problem that the mountability is poor.

The present invention has been made based on the above circumstances, and aims to improve the heat exchange efficiency by reducing the volume in the case through which water flows, and to reduce the weight by reducing the outer diameter of the case cylinder. Another object of the present invention is to provide a refrigeration cycle heat exchanger that is reduced in size.

[Means for Solving the Problems] The present invention employs the following technical means to achieve the above object.

One end is open, and the other end is a closed cylinder, which comprises a lid detachably attached to the open end of the cylinder, and a water supply port and a drain port for water on the lid, and A case provided with a supply port and a discharge port for the refrigerant, and a middle cylinder housed in the case, one end of which communicates with the water supply port, and the other end of which is open inside the cylinder and communicates with the drain port. A spiral portion that is housed in the case, one end of which is connected to the supply port, and the other end of which is connected to the discharge port, and spirally turns the outer periphery of the middle cylinder in a spiral shape, and the outside of the spiral portion A tube having a linear portion extending linearly from the bottom side to the lid side in the cylindrical body, wherein the case includes a groove for accommodating the linear portion of the tube, and along the groove. The wall surface of the cylindrical body may protrude outward.

[Operation and Effect of the Invention] According to the present invention having the above-described configuration, a groove for accommodating a linear portion of a tube is provided in a cylinder of a case, and a wall surface of the cylinder protrudes outward along the groove. Thereby, the interval between the inner peripheral surface of the cylindrical body excluding the groove and the outer diameter of the spiral tube can be reduced. As a result, the flow velocity of the water flowing in the case becomes faster than before, and the heat exchange efficiency between the water and the refrigerant is improved. Further, since the outer diameter of the cylindrical body can be reduced, the weight and the size can be reduced.

Example Next, a heat exchanger of a refrigeration cycle of the present invention will be described based on an example shown in the drawings.

(First Embodiment) FIG. 1 is a sectional view of a refrigerant condenser of a refrigeration cycle, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a perspective view of the refrigerant condenser.

The refrigeration cycle 1 used in the marine air conditioner includes:
As shown in FIG. 4, the compressor includes a refrigerant compressor 2, a refrigerant condenser 3, a receiver 4, a refrigerant pressure reducing device 5, and a refrigerant evaporator 6, which are sequentially connected by a refrigerant pipe 7.

The refrigerant condenser 3, which is the heat exchanger of the present invention, condenses and liquefies the high-temperature and high-pressure refrigerant sent from the refrigerant compressor 2 by heat exchange with seawater.

The refrigerant condenser 3 has a cylindrical body 8 made of a hard synthetic resin such as vinyl chloride with an upper end (upper end shown) opened and a lower end closed, and an open end (upper end) of the cylindrical body 8 hermetically sealed. A case 10 comprising a lid 9 to be stopped is provided.

Inside the cylindrical body 8, a cylindrical middle cylinder 11 and a tube 12 serving as a refrigerant passage in the case 10 are housed.

An annular flange 13 made of the same material as the cylindrical body 8 is fitted around the outer periphery of the upper end of the cylindrical body 8, and the flange
13 and is fixed by a method such as adhesion or heat fusion. Flange
At 13, bolt insertion holes 13 a are provided at a plurality of locations at appropriate intervals, and a mounting groove 13 b of an O-ring 14 mounted to maintain airtightness between the lid 9 and the cylinder 8. Is provided. The cylindrical body 8 is provided with a groove 8a for accommodating a linear portion of the tube 12, which will be described later, and the wall surface of the cylindrical body 8 projects outward along the groove 8a (see FIG. 3). ).

The lid 9 is a disk having the same diameter as the flange 13, and is made of the same synthetic resin or metal as the cylinder 8. The lid 9 has a bolt insertion hole 9a at a position corresponding to the hole 13a of the flange 13, and a mounting groove 9b for the O-ring 14 on the inner peripheral side of the hole 9a. A water supply pipe for supplying seawater into the case 10 is provided on the lid 9.
A water supply port 16 to which 15 is connected, a drainage port 18 to which a drainage pipe 17 for draining seawater from inside the case 10, and a case
Two through holes 19 and 20 (refrigerant supply port and discharge port) for taking out both ends of the tube 12 housed in the tube 10 are provided.

The middle cylinder 11 has its lower end fitted to a flange 21 fixed to the bottom of the cylinder 8 and is stably supported in the case 10. An opening 11a that opens into the case 10 is provided on the lower side wall surface of the middle cylinder 11.

The tube 12 is made of a material such as aluminum or copper,
A helical portion 12A that spirals around the outer periphery of the middle cylinder 11, and a spiral portion 12A is drawn out of the helical portion 12A on the bottom inside the cylindrical body 8 of the helical portion 12A, and then a straight line is formed outside the helical portion 12A. And a linear portion 12B that rises up gradually. The linear portion 12B is housed in the groove 8a of the cylindrical body 8 as shown in FIG. One end 12a of the tube 12 taken out from the upper side of the spiral portion 12A through one through hole 19 (refrigerant supply port) of the lid 9 and the lid 9 from the upper side of the linear portion 12B. The other end 12b of the tube 12 taken out through the other through hole 20 (a refrigerant outlet)
A union nut 22 of a union joint is attached to each, and connected to the refrigerant pipe 7 via the union nut 22.

After the O-ring 14 is attached to the cylinder 8, the cylinder 8 and the lid 9 constituting the case 10 are connected to the hole 13 a of the flange 13 and the hole 9 of the lid 9.
The cover 9 is aligned with the cylindrical body 8 by combining a and the bolt 23 and the nut 24 are fixed by tightening.

 Next, the operation of the present embodiment will be described.

By driving a marine engine (not shown), the refrigerant compressor 2 fastened to the engine is operated. By the operation of the refrigerant compressor 2, the refrigerant drawn into the refrigerant compressor 2 is compressed to a high temperature and a high pressure and discharged.

The refrigerant discharged from the refrigerant compressor 2 is guided to the refrigerant condenser 3 through the refrigerant pipe 7, and is connected to the tube 12 of the refrigerant condenser 3.
When flowing through the inside, heat exchange occurs with the seawater flowing into the case 10 to condense and liquefy.

On the other hand, seawater flows into the case 10 from the water supply pipe 15 through the water supply port 16, passes through the inside of the middle cylinder 11 housed in the case 10, and opens to the lower side of the middle cylinder 11. When flowing out of the middle cylinder 11 to the outside of the middle cylinder 11 toward the drain port 18, the refrigerant exchanges heat with the refrigerant flowing in the tube 12 and is heated, and is drained by the drain pipe 17 through the drain port 18. Is done.

The refrigerant discharged from the refrigerant condenser 3 is supplied to the temporary receiver 4
After being stored in the refrigerant, it is gas-liquid separated by the receiver 4, decompressed when passing through the refrigerant decompression device 5, and supplied to the refrigerant evaporator 6. The refrigerant supplied to the refrigerant evaporator 6 is heat-exchanged with air passing through the refrigerant evaporator 6 by the operation of a blower (not shown) to evaporate, becomes a gas refrigerant, is sucked by the refrigerant compressor 2, and repeats the above cycle. repeat.

The air cooled by the heat exchange with the refrigerant in the refrigerant evaporator 6 is blown into the cabin in which the refrigerant evaporator 6 is arranged to cool the cabin.

(Effects of the present embodiment) According to the present embodiment, the groove 8a for accommodating the linear portion 12B of the tube 12 is provided in the cylindrical body 8 of the case 10, and the wall surface of the cylindrical body 8 extends outward along the groove 8a. Since it is projected, the groove
The inner peripheral surface of the cylindrical body 8 excluding 8a and the spiral portion 12A of the tube 12
The gap formed with the outer diameter of the first member can be reduced. Thereby, the flow velocity of the seawater flowing in the case 10 becomes faster than the conventional case, and the heat exchange efficiency between the seawater and the refrigerant is improved. Further, since the outer diameter of the cylinder 8 can be reduced, the refrigerant condenser 3
Can be reduced in weight and size.

(Second embodiment) FIG. 5 is a sectional view of the refrigerant condenser 3, and FIG.
It is sectional drawing which follows the -B line.

In a large refrigeration system with a large amount of refrigerant, the refrigeration cycle 1
It is necessary to reduce the pressure loss of the refrigerant caused by the heat exchanger constituting the above. Therefore, a method of branching the refrigerant flow paths in the heat exchanger in a parallel state is an effective countermeasure.

For this reason, the tube 12 housed in the case 10 may be branched into, for example, four tubes in the case 10, and the four tubes 12 may be coaxially combined with the outer periphery of the middle cylinder 11. . In this case, four grooves 8a for accommodating the tubes 12 guided to the through holes 20 (coolant discharge ports) corresponding to the four tubes 12 are formed in the cylindrical body 8, and each groove 8a is formed in each groove 8a. The wall surface of the cylindrical body 8 projects outward along the same.

Thus, when only one tube 12 is used as in the first embodiment using the case 10 in which four grooves 8a are formed, as shown in FIGS. 5 and 6, The liner 25 can be inserted into the remaining three grooves 8a for use.

(Modification) In the embodiment described above, the heat exchanger of the present invention is used as the refrigerant condenser 3 used in the refrigeration cycle 1 of the marine air conditioner. good.

In addition, by using tap water instead of seawater as a medium that exchanges heat with the refrigerant in the refrigerant condenser 3, the refrigerant condenser 3 of the present embodiment can be used as a stationary (for example, a house or a factory) air conditioner. It can also be applied to

When the refrigeration cycle 1 is used for heating, the heat exchanger of the present invention may be applied to a vehicle as a refrigerant evaporator by using engine cooling water instead of seawater.

(Modification) In the above-described embodiment, the heat exchanger of the present invention is used as a refrigerant condenser for cooling the cabin. However, when the cabin is heated, the heat exchange between the condensed and liquefied refrigerant and the seawater is performed. It may be used as a heat exchanger for performing heat exchange.

Further, the case where the heat exchanger of the present invention is used as a refrigerant condenser in a refrigeration cycle of a marine air conditioner has been exemplified, but as a medium for heat exchange with the refrigerant, tap water is used instead of seawater. Alternatively, the present invention may be applied to an air conditioner used for stationary use (for example, a house or a factory).

When the refrigeration cycle is used for heating, the heat exchanger of the present invention may be applied to a vehicle as a refrigerant evaporator by using engine cooling water instead of seawater.

The seawater inlet 15 is used as the outlet 17 and the outlet 17 is used as the inlet
15, it is also possible to use the supply port 18 of the refrigerant as the discharge port 16 and use the discharge port 16 as the supply port 18.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a sectional view of a refrigerant condenser, FIG. 2 is a sectional view taken along line AA in FIG. Fig. 4 is a perspective view of a refrigerant condenser, Fig. 4 is a refrigerant circuit diagram of a refrigeration cycle, Figs. 5 and 6 show a second embodiment of the present invention, and Fig. 5 is a sectional view of the refrigerant condenser. FIG. 6 is a sectional view taken along the line BB of FIG. 5, and FIG. 7 is a sectional view of a conventional heat exchanger. In the figure, 8: cylindrical body, 8a: groove 9: lid, 10: case 11, middle cylinder, 12: tube 12A: spiral part of tube, 12B: linear part of tube 16 … Water supply port, 18… Drain port 19… Through hole (refrigerant supply port), 20… Through hole (refrigerant discharge port)

Claims (1)

(57) [Claims] 1. A cylinder having one end opened and a closed other end, and a lid detachably attached to an open end of the cylinder, and a water supply port for water. And drain,
And a case provided with a supply port and a discharge port for the refrigerant, and housed in the case, one end communicates with the water supply port, and the other end opens inside the cylindrical body and communicates with the drain port. A spiral part that is housed in the case, one end is connected to the supply port, and the other end is connected to the discharge port, and spirally turns the outer periphery of the middle cylinder in a spiral shape; and A tube having a linear portion extending linearly outward from the bottom side of the cylindrical body toward the lid, and the case includes a groove for accommodating the linear portion of the tube, and along the groove. Wherein the wall surface of the cylindrical body projects outward.