JP2011058649A - Heat exchanger and refrigerating machine - Google Patents

Abstract

Disclosed is a heat exchanger comprising a condenser and a supercooler, which has a condenser body and a supercooler that are reduced in size by separating the room of the condenser and the supercooler.
A shell and tube type condenser in which a heat transfer tube (2) for condensing a refrigerant is arranged inside a can body and a supercooler in which a heat transfer tube (4) for supercooling the refrigerant is arranged. In this case, a part of the condenser and a part of the supercooler share a wall, and a communication portion 3 through which condensed liquid refrigerant flows at one end side of the shared wall is provided. . In addition, a partition plate for partitioning the inside of the subcooler into a plurality of compartments is provided, a communication portion through which the liquid refrigerant flows between the plurality of compartments is provided in the partition plate, and a plurality of baffle plates are provided in the flow path through which the liquid refrigerant flows. Is provided.
[Selection] Figure 4

Description

  The present invention relates to a heat exchanger including a heat exchanger and a supercooler, and a refrigerator including the heat exchanger.

  Conventionally, as a supercooler that supercools the refrigerant condensed in the condenser of the compression refrigeration cycle, a supercooler that supercools the condensed refrigerant is provided together with the condenser inside the case of the condenser. There is. One example is JP-A-8-233408, in which a heat transfer tube for condensation is provided in the upper portion of the shell and tube heat exchanger, and a heat transfer tube for supercooling is provided in the lower portion thereof.

JP-A-8-233408

  However, in the above prior art, since the heat transfer tube for condensation and the heat transfer tube for supercooling are arranged inside the heat exchanger body, it is necessary to increase the diameter of the body portion of the heat exchanger itself. It was. In addition, it is necessary to install a partition plate for separating the condenser and the supercooler in the heat exchanger body and a heat transfer tube for the supercooler, which causes problems in assembly workability such as welding work in a narrow space. Furthermore, in the subcooler, the flow of the liquid refrigerant condensed in the condenser is one path flowing from one end side to the other end side of the heat transfer tube, so the contact time between the liquid refrigerant and the heat transfer tube is short, and the contact area is also small. There is a disadvantage that the supercooling performance does not increase so much.

  In order to remedy this drawback, it is conceivable to install a partition plate that divides the inside of the subcooler to increase the contact time. The work of installing is difficult.

  In view of the above-mentioned problems of the prior art, the present invention reduces the body diameter of a heat exchanger including a condenser and a supercooler, thereby reducing the overall size of the refrigerator and assembling the condenser and the supercooler. The present invention provides a heat exchanger having a simple structure and a refrigerator using the heat exchanger.

  In order to achieve the above object, the present invention supercools a shell-and-tube type condenser in which a heat transfer tube for condensing the refrigerant inside the can body and the liquid refrigerant condensed in the condenser are supercooled. A supercooler in which a heat transfer tube is disposed, and a part of the condenser and a part of the supercooler are joined together so as to share a wall, and the liquid refrigerant is provided on one end side of the shared wall. It is characterized by having a communication part through which the gas flows.

  Moreover, in the heat exchanger described above, the supercooler is joined to an outer wall surface of the condenser by welding so that the condenser and the supercooler each share a part of the wall. .

  Further, in the heat exchanger described above, a partition plate that partitions the interior of the supercooler into a plurality of compartments is provided, and a communication portion through which the liquid refrigerant flows between the plurality of compartments is provided on the partition plate. A plurality of baffle plates are provided in the flow path through which the refrigerant flows.

  According to the present invention, since the supercooler is arranged through the common wall outside the heat exchanger cylinder of the condenser, the diameter of the body of the heat exchanger itself can be reduced, and the entire refrigerator is also compact. Can be arranged. Since the supercooler is arranged and configured to share a part of the outer outer wall of the heat exchanger cylinder of the condenser, it can be easily assembled without installing a partition plate between the condenser and the supercooler. Moreover, since the contact time and contact area of the liquid refrigerant in the supercooler with the heat transfer tube can be increased, the heat transfer performance can be improved and the supercooling performance can be increased. The heat transfer performance can be improved by increasing the flow rate of the refrigerant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of a condenser and a subcooler according to Embodiment 1 of the present invention. It is a cross-sectional view of the condenser and supercooler of Example 1 in the same manner. It is the longitudinal cross-sectional view of the condenser and subcooler of Example 1 similarly. It is a perspective view shown notch partially of the condenser and the subcooler of Example 2 of the present invention. It is a cross-sectional view of the condenser and subcooler of Example 2 similarly. It is a block diagram of the refrigerator using the heat exchanger of the Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
Example 1
FIG. 1 is a cross-sectional perspective view showing a condenser and a supercooler according to a first embodiment of the present invention with a part thereof cut away. The basic structure of the condenser and the supercooler includes a can condenser 1, a heat transfer tube 2 for condensation, a supercooler 5, and a heat transfer tube 4 for supercooling. The condenser 1 is a horizontal shell having a cylindrical shape. A high-pressure gas refrigerant inlet 12 is provided above the shell, and a liquid refrigerant outlet 3 is provided at one end in the longitudinal direction at the lower part of the shell. A plurality of heat transfer tubes 2 are arranged in parallel in the longitudinal direction in the shell, and the high-pressure gas refrigerant taken in from the intake port 12 is condensed by the heat transfer tubes 2 to form a liquid refrigerant, and the liquid refrigerant is discharged from the outlet. 3 is allowed to flow downward and sent to the subcooler.

  The subcooler 5 is disposed in the lower part along the longitudinal direction of the shell of the condenser 1. Specifically, the supercooler 5 is a space that is disposed so as to face a closed space between a lower wall of a part of the shell and a lower wall of a part of the shell. A plurality of heat transfer tubes 4 are arranged in the interior. In addition, the supercooler 5 supercools the liquid medium taken in from the outlet 3 by the heat transfer tube 4, and connects the communication portion 6 for discharging the supercooled liquid refrigerant to the outlet 3 in the longitudinal direction of the shell. On the opposite side. The space defining member 5a is formed by bending a plate material.

  Here, the high-pressure gas refrigerant discharged from the compressor (described later) is guided to the intake port 12, and the supercooled liquid refrigerant is sent to the expander (described later) from the communication portion 6, and is evaporated to the downstream side of the expander. A vessel (described later) is connected to form a refrigeration cycle that repeats compression, condensation, expansion, and evaporation.

  FIG. 2 is a cross-sectional view of the condenser and the subcooler of this embodiment. In FIG. 2, the subcooler 5 has one pressure when the outer wall below a part of the shell of the condenser 1 and the portions 5 b on both sides in contact with the space defining member 5 a are integrally joined by welding from the outside. A part of the lower wall of the condenser 1 becomes a container, and the condenser 1 and the subcooler 5 share a wall. The welding in this case is a welding operation from the outside of the condenser 1 and the subcooler 5 as is apparent from FIG. 2, and the operation is easy and the welding quality can be improved.

  FIG. 3 is a longitudinal sectional view of the condenser and the subcooler of the present embodiment. In FIG. 3, 20 is a tube plate which closes the opening part of the both ends of the condenser 1 and the subcooler 5, and is joined to the both ends of the condenser 1 and the subcooler 5 by welding from the outside. Further, the heat transfer tubes 2 and 4 are joined to the tube plate 20 by expanding the heat transfer tubes 2 and 4 so that both ends thereof penetrate, and the inside of the shell of the condenser 1 is connected via the left and right tube plates 20. In addition, a plurality of heat transfer tubes 2 for condensation are arranged, and a plurality of heat transfer tubes 4 for supercooling are arranged inside the supercooler 5. Further, a water chamber case 21 with a partition plate 22 is joined to the outside of one tube plate 20 by bolting or welding, and a return water chamber case 23 without a partition is bolted or welded to the outside of the other tube plate. It is joined with. Since all the joining of the tube plate 20 and the water chamber cases 21 and 23 can be performed from the outside, the operation is easy and the quality can be improved.

  By comprising as mentioned above, the lower water chamber 21a comprised by the tube plate 20, the water chamber case 21, and the partition plate 22, and the water chamber 23a for return comprised by the tube plate 20 and the water chamber case 23 Are communicated by a part of the heat transfer tube 2 for condensation and the heat transfer tube 4 for supercooling, and an upper water chamber 21b constituted by a tube plate 20, a water chamber case 21 and a partition plate 22, and the water chamber 23a is communicated with the heat transfer tube 2 for condensation. In FIG. 3, when cooling water is injected into the water chamber 21a, the cooling water flows into the water chamber 23a through a part of the heat transfer tube 2 for condensation and all of the heat transfer tube 4 for supercooling. It returns and flows into the water chamber 22a through the heat transfer tube 4. That is, the cooling water flows over two reciprocating passes.

  Since the cooling water flows in the order of the heat transfer tube 4 and the heat transfer tube 2, the heat transfer tube 4 is kept at a lower temperature than the heat transfer tube 2. The cooling water is cooling water supplied from an external heat source, and is used for condensing the gas refrigerant and for supercooling the condensed liquid refrigerant.

  In FIG. 3, the supercooling heat transfer tube 4 and a part of the condensation heat transfer tube 2 are configured to pass water through the first pass of the cooling water, but the partition plate 22 is condensed via the tube plate 20. The heat transfer tube 2 for cooling and the heat transfer tube 4 for supercooling may be arranged as shown by a broken line so as to be separated, and only the heat transfer tube 4 for supercooling may be passed through the first pass of the cooling water. Further, a partition plate may be arranged also in the return water chamber 23a so that the cooling water has three passes or four passes.

  In the above configuration, when the high-pressure gas refrigerant discharged from the compressor (described later) is taken into the condenser 1 from the intake port 12, the high-pressure gas refrigerant comes into contact with the heat transfer tube 2 in the condenser 1 and is condensed. It becomes a liquid refrigerant. The refrigerant that has become liquid by condensation flows out from the outlet 3 at the bottom of the condenser 1 to the supercooler 5. The liquid refrigerant contacts the heat transfer tube 4 in the supercooler 5 to be further cooled, and is discharged from the communication port 6 disposed on the side surface of the supercooler 5. Here, after the liquid refrigerant enters from the outlet 3, it flows through the flow path to the communication port 6 provided on the side opposite to the outlet 3 while being in contact with the heat transfer tube 4 for a long time. Overcooled.

(Example 2)
FIG. 4 is a perspective view showing a part of the condenser and the subcooler according to the second embodiment of the present invention. FIG. 5 is a longitudinal sectional view of the condenser and the subcooler according to the second embodiment. The basic structure of the condenser and the supercooler includes a can condenser 1, a heat transfer tube 2 for condensation, a supercooler 5, and a heat transfer tube 4 for supercooling. The structure of the subcooler 5 is different from that of the first embodiment.

  4 and 5, the condenser 1 is a horizontal shell having a cylindrical shape, and a high-pressure gas refrigerant inlet 12 is provided above the shell, and a liquid refrigerant outlet 3 is provided at one end in the longitudinal direction below the shell. Is provided. A plurality of heat transfer tubes 2 are arranged in parallel in the longitudinal direction in the shell, and the high-pressure gas refrigerant taken in from the intake port 12 is condensed by the heat transfer tubes 2 to form a liquid refrigerant, and the liquid refrigerant is discharged from the outlet. 3 is allowed to flow downward and sent to the subcooler 5.

  The subcooler 5 is disposed in the lower part along the longitudinal direction of the shell of the condenser 1. Specifically, the supercooler 5 is a space that is disposed so as to face a closed space between a lower wall of a part of the shell and a lower wall of a part of the shell. It is comprised by the definition member 5a. The space defining member 5a is provided with a partition plate 7 for dividing the space into a plurality (two in the drawing), and the partition plate is disposed in parallel with the longitudinal direction of the shell. The space defining member 5a includes two divided members 10 and 11 that are divided in the width direction. The space is configured as a single pressure vessel by integrally joining an outer wall below a part of the shell of the condenser 1 and portions 10b and 11b in contact with the dividing members 10 and 11 by welding from outside. The wall below is a common wall for the condenser 1 and the subcooler 5. In each of the sections 10a and 11a divided into two, a plurality of heat transfer tubes 4 are arranged along the longitudinal direction of the shell. The outlet 3 is provided at the lower part of the shell so that the liquid refrigerant flows into the partition 10 a surrounded by the dividing member 10, the lower part of the shell and the partition plate 7.

  In each of the sections 10a and 11a divided into two, baffle plates 8 for fixing the plurality of heat transfer tubes 4 are provided so as to be orthogonal to the longitudinal direction of the shell. The baffle plate 8 also has a function of meandering the liquid refrigerant flowing from the condenser 1 and improving the supercooling performance. Furthermore, a communication port 9 is provided on the side opposite to the outflow port 3 in the longitudinal direction of the shell of the partition plate 7 so that the liquid refrigerant flows back and flows between the two sections 10a and 11a. And the communication part 6 for discharging | emitting the liquid refrigerant which flowed from the divisions 10a to 11a from the subcooler 5 is on the opposite side to the communication port 9 of the longitudinal direction of the shell of the division member 11 (the same side as the outflow port 3). Prepare for the side.

  In the above configuration, when the high-pressure gas refrigerant discharged from the compressor (described later) is taken into the condenser 1 from the intake port 12, the high-pressure gas refrigerant comes into contact with the heat transfer tube 2 in the condenser 1 and is condensed. It becomes a liquid refrigerant. The refrigerant that has become liquid by condensation flows out from the outlet 3 at the bottom of the condenser 1 to the supercooler 5. The liquid refrigerant flows from the outlet 3 to the compartment (flow path) 10a of the supercooler 5 and is cooled in contact with the heat transfer tube 4 in the compartment 10a through the communication port 9 of the partition plate 7. ) It flows back to 11a, and is discharged from the communication port 6 arranged on the side surface of the subcooler 5 while being cooled by contacting the heat transfer tube 4 in this section 11a. The liquid refrigerant flows while meandering the baffle plate 8 when flowing from the outlet 3 through the flow paths of the sections 10a and 11a of the supercooler 5.

  In the second embodiment, by providing the partition plate 7 and the baffle plate 8 in the supercooler 5 as described above, the liquid refrigerant flows while contacting the heat transfer tube 4 for a long time, so that the supercooler is effectively supercooled. Further, by providing the partition plate 7 in the supercooler, the flow path through which the liquid refrigerant in the supercooler is narrowed, resulting in an increase in the flow rate of the liquid refrigerant and providing a high performance supercooler. be able to.

  The assembly method of the configuration of this embodiment will be described. First, the shell of the condenser 1 is arranged, and the partition plate 7 is welded to the lower wall of the shell. Next, the baffle plate 8 is welded to the partition plate 7, and the baffle plate 8 is also welded to the divided member 10 and the divided member 11. Split members 10 and 11 with baffle plates are inserted into the shell and the partition plate 7 with baffle plates from the outside, a part of the outer wall of the shell and the junction between the split members 10 and 11, and the partition plate 7 and the split member 10. , 11 are welded from the outside. The heat transfer tubes 2 and 4 are inserted into the heat exchanger later, and the heat transfer tubes are expanded and joined near the tube plate 20. All the main weldings are from the outside and work is easy, and the quality of the welding can be improved.

  In Embodiment 1 and Embodiment 2 described above, the space defining member of the supercooler disposed on the outer wall surface of the condenser is formed in a square shape combined with a flat surface. It may be configured. By doing in this way, there exists an effect that intensity | strength increases with respect to a pressure and the plate | board thickness of a wall surface can be made thin.

  FIG. 6 is a configuration diagram of a refrigerator using the heat exchanger according to the embodiment of the present invention. In this refrigerator, the said Example 2 is used as a heat exchanger, and the same code | symbol as the said Example shows the same part. 31 is a compressor which compresses the refrigerant of the refrigeration cycle, and supplies the discharged high-pressure gas refrigerant to the intake port 12 of the condenser 1. 32 is an expander to which the supercooled liquid refrigerant discharged from the communication part 6 of the supercooler 5 is supplied. An evaporator 33 is connected to the downstream side of the expander 32 and supplies a heat source necessary for a load (cooling). Not only the second embodiment but also the heat exchanger of the first embodiment can be applied to the refrigerator.

  This refrigerator has the effects of the above-described embodiments. That is, the entire refrigerator can be arranged compactly by reducing the diameter of the body portion of the heat exchanger itself. Since the heat exchanger can be easily assembled, the cost of the refrigerator can be reduced. Moreover, the performance of the refrigerator can be increased by improving the supercooling performance of the supercooler.

  DESCRIPTION OF SYMBOLS 1 ... Condenser (can body), 2 ... Heat transfer tube for condensation, 3 ... Outlet, 4 ... Heat transfer tube for supercooling, 5 ... Supercooler, 5a ... Dividing member, 6 ... Communication part, 7 ... Partition Plate 8, baffle plate 9, communication portion 10, 11, divided member 10 a, 11 a, partition (flow path), 12 intake port, 20 tube plate, 21 water chamber case, 22 partition plate, 23 ... Return water chamber case.

Claims (4)

  A shell-and-tube type condenser having a heat transfer tube for condensing refrigerant inside the can body, and a supercooler having a heat transfer tube for supercooling the liquid refrigerant condensed in the condenser A part of the condenser and a part of the supercooler are joined together so as to share a wall, and a communication part through which the liquid refrigerant flows is provided on one end side of the shared wall. Heat exchanger.   2. The heat exchanger according to claim 1, wherein the supercooler is joined to an outer wall surface of the condenser by welding so that the condenser and the supercooler each share a part of the wall. Heat exchanger.   The heat exchanger according to claim 1 or 2, wherein a partition plate that partitions the interior of the supercooler into a plurality of compartments is provided, and a communication portion through which liquid refrigerant flows between the plurality of compartments is provided on the partition plate, Furthermore, the heat exchanger provided with the several baffle plate in the flow path through which a liquid refrigerant flows.   A refrigerator comprising the heat exchanger according to any one of claims 1 to 3.

Images