JP2018173190A - Connection device for heat exchanger - Google Patents

Abstract

A pressure loss can be reduced by connecting two heat exchangers by a connecting device and connecting pipes of the heat exchangers are eliminated, and a size of the refrigerator system in a longitudinal direction is shortened. And a connection device for a heat exchanger capable of minimizing an installation space. A connection device (2) for connecting a two-pass shell-and-tube heat exchanger of two refrigerators, wherein the inside of a substantially cylindrical or substantially rectangular connection device main body (21) is partitioned. A first opening A1 for allowing fluid to flow into and out of one path of the two-pass first heat exchanger 1-1, into the partition plate 22 that forms a flow path with the connecting device main body 21, A second opening A2 for flowing fluid in and out of one path of the heat exchanger 1-2 was provided. [Selection diagram] Fig. 1

Description

  The present invention relates to a connection device for a heat exchanger for connecting two-pass shell and tube heat exchangers of two refrigerators.

  Conventionally, a refrigerator system including a plurality of refrigerators including an evaporator, a compressor, a condenser, and the like has been used. In this refrigerator system, for example, as described in Japanese Patent Application Laid-Open No. 2007-183077 (Patent Document 1), two evaporators in two refrigerators are connected in series by piping, The condenser is connected in series by piping. Accordingly, the cold water is sequentially cooled by the evaporation heat of the refrigerant in the two evaporators, and the cooling water sequentially cools the refrigerant vapor in the two condensers. Thus, by supplying cold water and cooling water in series to a plurality of refrigerators, the average evaporation temperature can be increased and the average condensation temperature can be decreased. (See paragraphs [0022] and [0023] of Patent Document 1)

JP 2007-183077 A

  However, as described in Patent Document 1, when two evaporators are connected in series by piping and two condensers are connected in series by piping, pressure loss due to the piping occurs, and cooling occurs. There is a problem that the power of the pump of water and cold water increases, and the power consumption of the pump increases, and there is a problem that a large installation space is required because the longitudinal dimension of the refrigerator system becomes long. .

  The present invention has been made in view of the above circumstances, and by connecting two heat exchangers with a connecting device and deleting the piping for connecting the heat exchanger, pressure loss can be reduced, and An object of the present invention is to provide a connection device for a heat exchanger that can shorten the dimension in the longitudinal direction of the refrigerator system and minimize the installation space.

  In order to achieve the above-mentioned object, a connection device for a heat exchanger according to the present invention is a connection device for connecting two-pass shell and tube heat exchangers of two refrigerators, and is substantially cylindrical or substantially A partition plate that forms a flow path by partitioning the inside of the rectangular tubular connecting device main body, and a first opening for allowing the connecting device main body to flow in and out of one path of the two-pass first heat exchanger And a second opening through which fluid flows in and out of one path of the two-pass second heat exchanger.

According to a preferred aspect of the present invention, four chambers are formed by partitioning the connecting device main body with the partition plate, and the four chambers communicate with one path of the first heat exchanger. A second room communicating with the other path of the first heat exchanger, a third room communicating with one path of the second heat exchanger, and the other room of the second heat exchanger. A fourth chamber that communicates with a path, a connection flow path is provided by the partition plate to connect the second chamber and the third chamber, and the fluid passes through the first path of the first heat exchanger, The first heat exchanger and the second heat exchanger can be connected so as to flow in the order of the second path of the first heat exchanger, the first path of the second heat exchanger, and the second path of the second heat exchanger. It is characterized by being.
According to the present invention, the fluid is passed through the lower channel of the first heat exchanger, the upper channel of the first heat exchanger, and the lower side of the second heat exchanger by intersecting the channels inside the connection device. It is possible to flow in the order of the flow path and the upper flow path of the second heat exchanger, the temperature range is different between the first heat exchanger and the second heat exchanger, the tube heat transfer by the heat exchanger is improved, and the performance of the refrigerator Since the temperature difference between the inlet and outlet of the cold water is large, the power consumption of the main motor can be reduced.

According to a preferred aspect of the present invention, three rooms are formed by partitioning the connection device main body with the partition plate, and the three rooms communicate with one path of the first heat exchanger. A second room communicating with the other path of the first heat exchanger and one path of the second heat exchanger, and a third room communicating with the other path of the second heat exchanger The fluid flows in the order of the first path of the first heat exchanger, the second path of the first heat exchanger, the second path of the second heat exchanger, and the first path of the second heat exchanger. The first heat exchanger and the second heat exchanger can be connected.
According to the present invention, the width of one opening for flowing in and out of the fluid is increased as compared with the connection device having the four rooms, but the refrigerator is installed while providing the effect of the double refrigeration cycle. Space can be reduced.

According to a preferred aspect of the present invention, the first heat exchanger and the second heat exchanger are arranged up and down 2 in which one of the first path and the second path is disposed on the upper side and the other is disposed on the lower side. It consists of a heat exchanger of a path. According to the present invention, it is possible to connect two existing heat exchangers having a first path and a second path above and below.
According to a preferred aspect of the present invention, the first heat exchanger and the second heat exchanger are evaporators of a compression refrigerator, and the fluid is either the first heat exchanger or the second heat exchanger. It flows in the order of the first path on the lower side of the one, the second path on the upper side of the same heat exchanger, the first path on the lower side of the other heat exchanger, and the second path on the upper side of the same heat exchanger. And

According to a preferred aspect of the present invention, the first heat exchanger and the second heat exchanger have two left and right paths in which one of the first path and the second path is disposed on the left side and the other is disposed on the right side. It is characterized by comprising a heat exchanger. According to the present invention, it is possible to connect two existing heat exchangers having a first path and a second path on the left and right.
According to a preferred aspect of the present invention, an axial width of the connection device main body is equal to or larger than a diameter of an opening through which the fluid flows in and out.

According to a preferred aspect of the present invention, the connecting device body includes flange portions for connecting to the tube plates of the first heat exchanger and the second heat exchanger at both ends in the axial direction. And
Thus, by providing a flange part, two heat exchangers can be connected easily.
According to a preferred aspect of the present invention, since the connection device body has a symmetrical structure, 360 is provided for the first heat exchanger and the second heat exchanger corresponding to the form of the heat exchanger path. ° It is possible to rotate.
Thus, it becomes possible to attach a connection apparatus main body at any angle, and the freedom degree of the attachment location of the equipment side piping of cold water or cooling water can be increased.
According to a preferred aspect of the present invention, the heat exchanger is an evaporator or a condenser of a compression refrigerator.

  In the compression refrigerator system of the present invention, the evaporator and / or condenser of the first refrigerator and the evaporator and / or condenser of the second refrigerator are connected to each other by the connection device described above. It is characterized by that.

According to the present invention, two heat exchangers are connected by a connecting device, and the connection pipe of the heat exchanger is deleted, whereby the flow of cooling water and cold water becomes smooth, and the pressure loss is reduced by reducing the pressure loss. Power consumption can be reduced. Further, the longitudinal dimension of the refrigerator system can be shortened, and the installation space can be minimized.
Further, according to the present invention, by adopting the connection device, the fluid is transferred to the lower flow path of the first heat exchanger, the upper flow path of the first heat exchanger, the lower flow path of the second heat exchanger, It can flow in the order of the upper flow path of the second heat exchanger, the tube heat transfer by the heat exchanger is improved, the performance of the refrigerator is improved, and the power consumption of the main motor can be reduced.

FIG. 1 is a diagram showing a first embodiment of a connection device for a heat exchanger according to the present invention, and is an exploded perspective view showing the connection device and two heat exchangers to be connected. FIG. 2 is a perspective view of the heat exchanger connection device. Drawing 3 is a front view showing the state where the 1st heat exchanger and the 2nd heat exchanger were connected by the connecting device. FIG. 4 is a perspective view of the connecting device as viewed from the first heat exchanger side. FIG. 5 is a perspective view of the connecting device as viewed from the first heat exchanger side. FIG. 6 is a perspective view of the connection device as viewed from the second heat exchanger side. FIG. 7 is a perspective view of the connecting device as viewed from the second heat exchanger side. FIG. 8: is a figure which shows 2nd Embodiment of the connection apparatus for heat exchangers which concerns on this invention, and is a disassembled perspective view which shows a connection apparatus and two heat exchangers of connection object. FIG. 9 is a perspective view of the heat exchanger connection device. FIG. 10 is a front view showing a state in which the first heat exchanger and the second heat exchanger are connected by the connecting device. FIG. 11 is a perspective view of the connection device as viewed from the first heat exchanger side. FIG. 12 is a perspective view of the connection device as viewed from the first heat exchanger side. FIG. 13 is a perspective view of the connection device as viewed from the second heat exchanger side. FIG. 14 is a perspective view of the connecting device as viewed from the second heat exchanger side. FIG. 15A is a diagram showing a connection method of the first evaporator and the second evaporator as a single refrigeration cycle, and FIG. 15B is a diagram illustrating the first evaporator and the second evaporator as a double refrigeration cycle. It is a figure which shows the connection method of an evaporator. FIG. 16 is a graph showing the relationship between cold water or cooling water temperature-specific entropy in a single refrigeration cycle and a double refrigeration cycle. 17 (a) and 17 (b) are external views of a compression type refrigerator system in which the evaporator and condenser of the first refrigerator and the evaporator and condenser of the second refrigerator are connected to each other by a connecting device. It is a figure which shows a structure, Fig.17 (a) is a front view, FIG.17 (b) is a rear view.

Hereinafter, an embodiment of a heat exchanger connecting device according to the present invention will be described with reference to FIGS. 1 to 17. 1 to 17, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a diagram showing a first embodiment of a connection device for a heat exchanger according to the present invention, and is an exploded perspective view showing the connection device and two heat exchangers to be connected. FIG. 2 is a perspective view of the heat exchanger connection device.
As shown in FIG. 1, a connection device 2 is disposed between two heat exchangers to be connected, each of which includes a first heat exchanger 1-1 and a second heat exchanger 1-2. In FIG. 1, the state before connecting the 1st heat exchanger 1-1 and the 2nd heat exchanger 1-2 with the connection apparatus 2 is shown. Each of the heat exchangers 1-1 and 1-2 has a large number of spaces in a space formed by a cylindrical can body 11 and tube plates (tube plates) 12 and 12 provided at both ends of the can body 11. A heat transfer tube group (not shown) in which heat transfer tubes (not shown) are arranged in a staggered manner is arranged.

  The first heat exchanger 1-1 and the second heat exchanger 1-2 are two-pass shell-and-tube heat exchangers each including two heat transfer tube groups. The first heat exchanger 1-1 and the second heat exchanger 1-2 are an upper and lower two-pass heat exchanger in which one of the first path and the second path is disposed on the upper side and the other is disposed on the lower side. Or a left-right two-pass heat exchanger in which one of the first path and the second path is arranged on the left side and the other is arranged on the right side. The connection device 2 is disposed between the tube plate 12 of the first heat exchanger 1-1 and the tube plate 12 of the second heat exchanger 1-2. The first heat exchanger 1-1 and the second heat exchanger 1-2 are provided with a water chamber 13 for path folding at the end opposite to the connection device 2.

  As shown in FIGS. 1 and 2, the connection device 2 includes a connection device main body 21 having a substantially cylindrical shape, and four rooms are formed by partitioning the inside of the connection device main body 21 with a partition plate 22. Here, the connection device main body 21 may have a substantially rectangular tube shape. The four rooms include a first room R1 that communicates with one path of the first heat exchanger 1-1, a second room R2 that communicates with the other path of the first heat exchanger 1-1, It consists of a third room R3 that communicates with one path of the two heat exchanger 1-2 and a fourth room R4 that communicates with the other path of the second heat exchanger 1-2. A connection channel 22p is provided in the partition plate 22 to allow the second room R2 and the third room R3 to communicate with each other. The connection device main body 21 has a first opening A1 for flowing fluid into and out of one path of the two-pass first heat exchanger 1-1, and one path of the two-pass second heat exchanger 1-2. A second opening A2 through which fluid flows in and out is provided. The first opening A1 communicates with the first room R1, and the second opening A2 communicates with the fourth room R4. The axial width of the connection device main body 21 is set to be equal to or larger than the diameters of the openings A1 and A2 through which fluid flows in and out. The connection device main body 21 includes flange portions 21f and 21f for connecting to the tube plate 12 of the first heat exchanger 1-1 and the tube plate 12 of the second heat exchanger 1-2 at both ends in the axial direction. Yes.

  FIG. 3 is a front view showing a state in which the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected by the connecting device 2. As shown in FIG. 3, the tube plate 12 of the first heat exchanger 1-1 and the flange portion 21f of the connection device main body 21 are fastened by a fastener 15 such as a bolt and a nut, and the second heat exchanger The tube sheet 12 of 1-2 and the flange part 21f of the connection apparatus main body 21 are fastened by fasteners 15 such as bolts and nuts. Thereby, the 1st heat exchanger 1-1 and the 2nd heat exchanger 1-2 are connected by the connection apparatus 2, and are integrated. At the time of this integration, the connection device main body 21 corresponds to the first heat exchanger 1-1 and the first heat exchanger 1-1 in correspondence with the form of the heat exchanger path (that is, the upper and lower two-pass form, the left and right two-pass form, etc.). 2 It can rotate 360 ° with respect to the heat exchanger 1-2. Thus, by providing a flange part, two heat exchangers can be connected easily. Moreover, since it becomes possible to attach a connection apparatus main body at any angle, the freedom degree of the attachment location of the equipment side piping of cold water or cooling water can be increased.

Next, the flow of fluid after the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected by the connecting device 2 will be described with reference to FIGS. 1 and 3.
As shown by arrows in FIGS. 1 and 3, the fluid flows from the first opening A <b> 1 into the first chamber R <b> 1 in the connection device main body 21, and the first path, 1 flows in the order of the second path of the heat exchanger 1-1 and flows into the second room R2 in the connection device main body 21, and then enters the third room R3 through the connection flow path 22p of the partition plate 22. Flows in the order of the first path of the second heat exchanger 1-2 and the second path of the second heat exchanger 1-2 and flows into the fourth room R4 in the connection device body 21, It flows out from the opening A2.

  As described above, in the connection device 2, the fluid is the first path of the first heat exchanger 1-1, the second path of the first heat exchanger 1-1, and the first path of the second heat exchanger 1-2. The first heat exchanger 1-1 and the second heat exchanger 1-2 can be connected so as to flow in the order of the second path of the second heat exchanger 1-2.

  Next, the configuration of the connection device 2 for forming the four chambers R1, R2, R3, R4 and the connection flow path 22p inside the substantially cylindrical connection device main body 21 will be described with reference to FIGS. To do. Four partition plates 22 are provided to form four chambers R1, R2, R3, and R4 inside the connection device main body 21, but in the following description, the four partition plates 22 are distinguished. Therefore, description will be made by adding A, B, C, and D to the reference numeral 22.

  4 and 5 are perspective views of the connecting device 2 as viewed from the first heat exchanger 1-1 side. As shown in FIGS. 4 and 5, the connection device 2 includes a first room R <b> 1 and a second room R <b> 2 on the first heat exchanger side. The first room R <b> 1 is a space surrounded by the substantially semicircular partition plate 22 </ b> A, the substantially triangular plate partition plate 22 </ b> B, and the inner peripheral surface of the connection device main body 21. The second room R <b> 2 is a space surrounded by the substantially semicircular partition plate 22 </ b> C, the substantially triangular plate partition plate 22 </ b> B, and the inner peripheral surface of the connection device main body 21. The partition plate 22B has a substantially right triangle shape, and its base is located on the first heat exchanger side and its hypotenuse is located on the second heat exchanger side. The substantially triangular opening formed on the slope side of the partition plate 22B is a connection flow path 22p that communicates the second chamber R2 and the third chamber R3 on the back surface side of the partition plate 22A. The first opening A1 communicates with the first room R1.

6 and 7 are perspective views of the connecting device 2 as viewed from the second heat exchanger 1-2. As shown in FIGS. 6 and 7, the connection device 2 includes a third room R3 and a fourth room R4 on the second heat exchanger side. The third room R <b> 3 is a space surrounded by the substantially semicircular partition plate 22 </ b> A, the substantially triangular plate partition plate 22 </ b> D, and the inner peripheral surface of the connection device main body 21. The fourth room R <b> 4 is a space surrounded by the substantially semicircular partition plate 22 </ b> C, the substantially triangular plate partition plate 22 </ b> D, and the inner peripheral surface of the connection device main body 21. The second opening A2 communicates with the fourth room R4. The partition plate 22D has a substantially right-angled triangle shape, and its base is located on the second heat exchanger side and its hypotenuse is located on the first heat exchanger side. As shown in FIG. 7, the connection flow path 22 p that is a substantially triangular opening is formed by the oblique side of the partition plate 22 </ b> D, the oblique side of the partition plate 22 </ b> B, and the inner peripheral surface of the connection device main body 21. The connection flow path 22p is composed of a bottom having dimensions close to the axial width of the connection device main body 21 and a triangular opening having a height approximately half the inner diameter of the connection device main body 21, and is usually cold water or cooling water. Since the inner diameter of the can body (the inner diameter of the connection device main body 21) is significantly larger than the pipe diameter (the diameter of the opening A1 or the opening A2), the cross-sectional area of the connection flow path 22p is the first opening A1 or The flow path cross-sectional area of the two openings A2 can be made larger.
Therefore, the width in the axial direction of the connection device main body 21 may be a width obtained by adding the width necessary to attach the openings A1 and A2 by welding or the like to the diameter of the opening A1 or the opening A2. Can be.

As shown in FIGS. 4 to 7, in the connection device 2 of the present invention, the four partition plates 22A, 22B, 22C, and 22D are provided inside the connection device main body 21, so that the first heat exchanger side is provided. Two rooms R1 and R2 are formed, and two rooms R3 and R4 are formed on the second heat exchanger side. Thus, the first room R1 is communicated with one path of the first heat exchanger 1-1, the second room R2 is communicated with the other path of the first heat exchanger 1-1, and the third room The room R3 can be communicated with one path of the second heat exchanger 1-2, and the fourth room R4 can be communicated with the other path of the second heat exchanger 1-2.
Here, when the 1st heat exchanger and the 2nd heat exchanger of the present invention are evaporators of a compression type refrigerator, cold water is put under either one of the 1st heat exchanger or the 2nd heat exchanger. It is preferable to flow in the order of the first path, the second path above the same heat exchanger, the first path below the other heat exchanger, and the second path above the same heat exchanger. The temperature of the cold water in the lower path of the first heat exchanger and the second heat exchanger is increased by flowing cold water from the lower path to the upper path of the first heat exchanger and the second heat exchanger. The liquid refrigerant easily evaporates from the liquid head, and the liquid head of the refrigerant liquid in the second path on the upper side of the can body of the first heat exchanger and the second heat exchanger is smaller than the liquid head of the first path on the lower side of the can body. Therefore, it is easy to evaporate. Therefore, since the liquid coolant is easily boiled by flowing the high temperature cold water from the lower first path to the upper second path of the heat exchanger, it is preferable as an evaporator in terms of efficiency.

FIG. 8: is a figure which shows 2nd Embodiment of the connection apparatus for heat exchangers which concerns on this invention, and is a disassembled perspective view which shows a connection apparatus and two heat exchangers of connection object. FIG. 9 is a perspective view of the heat exchanger connection device.
As shown in FIG. 8, the connection device 2 is disposed between two heat exchangers to be connected, each of which includes a first heat exchanger 1-1 and a second heat exchanger 1-2. In FIG. 8, the state before connecting the 1st heat exchanger 1-1 and the 2nd heat exchanger 1-2 with the connection apparatus 2 is shown. Each of the heat exchangers 1-1 and 1-2 has a large number of spaces in a space formed by a cylindrical can body 11 and tube plates (tube plates) 12 and 12 provided at both ends of the can body 11. A heat transfer tube group (not shown) in which heat transfer tubes (not shown) are arranged in a staggered manner is arranged.

  The first heat exchanger 1-1 and the second heat exchanger 1-2 are two-pass shell-and-tube heat exchangers each including two heat transfer tube groups. The first heat exchanger 1-1 and the second heat exchanger 1-2 are an upper and lower two-pass heat exchanger in which one of the first path and the second path is disposed on the upper side and the other is disposed on the lower side. Or a left-right two-pass heat exchanger in which one of the first path and the second path is arranged on the left side and the other is arranged on the right side. The connection device 2 is disposed between the tube plate 12 of the first heat exchanger 1-1 and the tube plate 12 of the second heat exchanger 1-2. The first heat exchanger 1-1 and the second heat exchanger 1-2 are provided with a water chamber 13 for path folding at the end opposite to the connection device 2.

  As shown in FIGS. 8 and 9, the connection device 2 includes a substantially cylindrical connection device body 21, and the interior of the connection device body 21 is partitioned by a partition plate 22 to form three rooms. The connection device main body 21 may have a substantially rectangular tube shape. The three rooms are a first room R1 communicating with one path of the first heat exchanger 1-1, the other path of the first heat exchanger 1-1, and one of the second heat exchanger 1-2. The second room R2 communicated with the second path and the third room R3 communicated with the other path of the second heat exchanger 1-2. The connection device main body 21 has a first opening A1 for flowing fluid into and out of one path of the two-pass first heat exchanger 1-1, and one path of the two-pass second heat exchanger 1-2. A second opening A2 through which fluid flows in and out is provided. The first opening A1 communicates with the first room R1, and the second opening A2 communicates with the third room R3. The axial width of the connecting device main body 21 is slightly larger than the sum of the diameter of the first opening A1 and the diameter of the second opening A2 in order to secure a space necessary for attaching the openings A1 and A2 by welding or the like. Is set. The connection device main body 21 includes flange portions 21f and 21f for connecting to the tube plate 12 of the first heat exchanger 1-1 and the tube plate 12 of the second heat exchanger 1-2 at both ends in the axial direction. Yes.

  FIG. 10 is a front view showing a state in which the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected by the connection device 2. As shown in FIG. 10, the tube plate 12 of the first heat exchanger 1-1 and the flange portion 21f of the connection device main body 21 are fastened by a fastener 15 such as a bolt and a nut. The second heat exchanger The tube sheet 12 of 1-2 and the flange part 21f of the connection apparatus main body 21 are fastened by fasteners 15 such as bolts and nuts. Thereby, the 1st heat exchanger 1-1 and the 2nd heat exchanger 1-2 are connected by the connection apparatus 2, and are integrated. At the time of this integration, the connection device main body 21 corresponds to the first heat exchanger 1-1 and the first heat exchanger 1-1 in correspondence with the form of the heat exchanger path (that is, the form of two upper and lower paths, the form of two left and right paths). 2 It can rotate 360 ° with respect to the heat exchanger 1-2.

Next, the flow of fluid after the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected by the connecting device 2 will be described with reference to FIGS. 8 and 10.
As shown by the arrows in FIGS. 8 and 10, the fluid flows from the first opening A1 into the first chamber R1 in the connection device main body 21, and passes through the first path and the first path of the first heat exchanger 1-1. It flows in order of the 2nd path of 1 heat exchanger 1-1, flows into 2nd room R2 in connecting device main part 21, and then the 2nd path of 2nd heat exchanger 1-2, the 2nd heat exchanger It flows in the order of the first path of 1-2, flows into the third room R3 in the connection device main body 21, and flows out from the second opening A2.

  As described above, in the connection device 2, the fluid is the first path of the first heat exchanger 1-1, the second path of the first heat exchanger 1-1, and the second path of the second heat exchanger 1-2. The first heat exchanger 1-1 and the second heat exchanger 1-2 can be connected so as to flow in the order of the first path of the second heat exchanger 1-2. The connection device 2 of the second embodiment has a width corresponding to one opening for flowing in and out of the fluid with respect to the connection device 2 of the first embodiment, while providing the effect of a double refrigeration cycle, The installation space for the refrigerator can be reduced.

  Next, the configuration of the connection device 2 for forming the three rooms R1, R2, and R3 inside the substantially cylindrical connection device main body 21 will be described with reference to FIGS. Two partition plates 22 are provided in the connection device main body 21 to form the three rooms R1, R2, and R3. In the following description, the two partition plates 22 are distinguished from each other. Description will be made by adding A and B to the reference numeral 22.

  11 and 12 are perspective views of the connecting device 2 as viewed from the first heat exchanger 1-1 side. As shown in FIGS. 11 and 12, the connecting device 2 includes a first room R1 and a second room R2 on the first heat exchanger side. The first room R <b> 1 is a space surrounded by a substantially semicircular partition plate 22 </ b> A, a substantially rectangular plate partition plate 22 </ b> B, and the inner peripheral surface of the connection device main body 21. The second room R <b> 2 is a space surrounded by the rectangular plate-shaped partition plate 22 </ b> B and the inner peripheral surface of the connection device main body 21. The first opening A1 communicates with the first room R1.

  13 and 14 are perspective views of the connection device 2 as viewed from the second heat exchanger 1-2. As shown in FIGS. 13 and 14, the connection device 2 includes a second room R2 and a third room R3 on the second heat exchanger side. The second room R2 is the same room as the second room R2 shown in FIGS. The third room R3 is a space surrounded by the substantially semicircular plate-like partition plate 22A, the substantially rectangular plate-like partition plate 22B, and the inner peripheral surface of the connection device main body 21. The second opening A2 communicates with the third room R3.

  As shown in FIGS. 11 to 14, in the connection device 2 of the present invention, the two partition plates 22 </ b> A and 22 </ b> B are provided inside the connection device main body 21, thereby providing two rooms R <b> 1 on the first heat exchanger side. , R2 and two chambers R2, R3 are formed on the second heat exchanger side. Thus, the first room R1 is communicated with one path of the first heat exchanger 1-1, the second room R2 is communicated with the other path of the first heat exchanger 1-1, and the second heat The third room R3 can be communicated with the other path of the second heat exchanger 1-2 by communicating with one path of the exchanger 1-2.

Next, the difference in efficiency between a single refrigeration cycle and a double refrigeration cycle in a refrigerator system connecting two-pass shell-and-tube heat exchangers of two refrigerators will be described. In the following description, the case of the first evaporator as the first heat exchanger and the second evaporator as the second heat exchanger will be described.
Fig.15 (a) shows the connection method of the 1st evaporator and 2nd evaporator as a single refrigeration cycle, FIG.15 (b) shows the 1st evaporator and 2nd evaporator as a double refrigeration cycle. Indicates the connection method. The connection method shown in FIG. 15B is implemented in the first embodiment of the present invention.

(1) In the connection method shown in FIG. 15 (a), the cold water passes through the upper path of the first evaporator, the upper path of the second evaporator, the lower path of the second evaporator, and the first evaporator. It flows in the order of the lower path.
(2) In the connection method shown in FIG. 15 (b), the cold water is supplied in the first path below the first evaporator, the second path above the first evaporator, and the second path below the second evaporator. It flows in order of one pass and the second pass above the second evaporator.

Generally, when connecting two heat exchangers, there are a connection method 1 as a single refrigeration cycle shown in FIG. 15 (a) and a connection method 2 as a double refrigeration cycle shown in FIG. 15 (b). Connection method 1 and connection method 2 are considered as follows.
In the connection method 1, the first and second evaporators are supplied with cold water, and the cooling water is supplied to the first and second condensers (not shown) in the same manner as the evaporator. Since the temperature and pressure inside the evaporator and the second evaporator are almost the same, and the temperature and pressure inside the first condenser and the second condenser are also almost the same, two single cycles are required. It is the same as being.
In the method of flowing in connection method 2, when cold water is passed through the first evaporator and the second evaporator, and cooling water is passed through the first condenser and the second condenser (not shown) as in the evaporator, the first Since the temperature and pressure inside the evaporator and the second evaporator are different, and similarly the temperature and pressure inside the first condenser and the second condenser are also different, it is the same as having one double refrigeration cycle. is there.

Next, the difference in compression work between the single refrigeration cycle and the double refrigeration cycle described above will be described.
FIG. 16 is a graph (representing compression work in an ideal cycle) showing a relationship between cold water or cooling water temperature-specific entropy of a single refrigeration cycle and a double refrigeration cycle. The broken line is a single cycle, and the solid line shows a double refrigeration cycle. The double refrigeration cycle is composed of two cycles of high pressure and low pressure, with the upper side showing a high pressure cycle and the lower side showing a low pressure cycle.
The area of FIG. 16 represents the compression work. The temperature head from the evaporation temperature to the condensation temperature is raised by the compressor, but in the double refrigeration cycle, the average temperature head is lowered by having two cycles in the refrigerator (suction of each compressor) And the discharge differential pressure can be reduced) to improve the efficiency. The hatched area in FIG. 16 is the difference in compression work between the single refrigeration cycle and the double refrigeration cycle.
Thus, when two heat exchangers are connected, since the compression work is smaller in the connection as the double refrigeration cycle than in the single refrigeration cycle, the electric power of the main motor can be reduced as a result. .

17 (a) and 17 (b) are external views of a compression type refrigerator system in which the evaporator and condenser of the first refrigerator and the evaporator and condenser of the second refrigerator are connected to each other by a connecting device. It is a figure which shows a structure, Fig.17 (a) is a front view, FIG.17 (b) is a rear view.
As shown in FIGS. 17A and 17B, the first refrigerator REF1 includes a first evaporator E1, a first compressor Comp1, and a first condenser C1. The second refrigerator REF2 includes a second evaporator E2, a second compressor Comp2, and a second condenser C2.
The first evaporator E1 of the first refrigerator REF1 and the second evaporator E2 of the second refrigerator REF2 are connected by the connection device 2 of the present invention. The first condenser C1 of the first refrigerator REF1 and the second condenser C2 of the second refrigerator REF2 are connected by the connection device 2 of the present invention.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

1-1 First heat exchanger 1-2 Second heat exchanger 2 Connection device 11 Tube body 12 Tube plate 13 Water chamber 15 Fastener 21 Connection device main body 21f Flange 22A, 22B, 22C, 22D Partition plate 22p Connection flow Path A1 1st opening A2 2nd opening C1 1st condenser C2 2nd condenser Comp1 1st compressor Comp2 2nd compressor E1 1st evaporator E2 2nd evaporator R1 1st chamber R2 2nd Room R3 Third room R4 Fourth room REF1 First refrigerator REF2 Second refrigerator

Claims (11)

A connection device for connecting two-pass shell and tube heat exchangers of two refrigerators,
A partition plate that forms a flow path by partitioning the inside of the connection device main body in a substantially cylindrical shape or a substantially rectangular tube shape;
A first opening for allowing fluid to flow into and out of one path of the two-pass first heat exchanger, and a second for allowing fluid to flow into and out of one path of the two-pass second heat exchanger. A connection device characterized in that an opening is provided. By partitioning the connection device main body with the partition plate, four rooms are formed,
A first room communicating with one path of the first heat exchanger;
A second room communicating with the other path of the first heat exchanger;
A third room communicating with one path of the second heat exchanger;
A fourth room communicating with the other path of the second heat exchanger,
Providing a connection flow path by the partition plate to communicate the second room and the third room;
1st heat exchange so that fluid flows in order of the 1st pass of the 1st heat exchanger, the 2nd pass of the 1st heat exchanger, the 1st pass of the 2nd heat exchanger, and the 2nd pass of the 2nd heat exchanger The connection device according to claim 1, wherein the heater and the second heat exchanger are connectable. Three rooms are formed by partitioning the connection device main body with the partition plate,
A first room communicating with one path of the first heat exchanger;
A second chamber communicating with the other path of the first heat exchanger and the one path of the second heat exchanger;
A third chamber communicating with the other path of the second heat exchanger;
1st heat exchange so that fluid flows in order of the 1st pass of the 1st heat exchanger, the 2nd pass of the 1st heat exchanger, the 2nd pass of the 2nd heat exchanger, and the 1st pass of the 2nd heat exchanger The connection device according to claim 1, wherein the heater and the second heat exchanger are connectable.   The first heat exchanger and the second heat exchanger are composed of upper and lower two-pass heat exchangers in which one of the first path and the second path is disposed on the upper side and the other is disposed on the lower side. The connection device according to claim 2 or 3, characterized in that   The first heat exchanger and the second heat exchanger are evaporators of a compression-type refrigerator, and the fluid is a first path below either one of the first heat exchanger or the second heat exchanger. The connecting device according to claim 4, wherein the flow passes through the second path on the upper side of the same heat exchanger, the first path on the lower side of the other heat exchanger, and the second path on the upper side of the same heat exchanger. .   The first heat exchanger and the second heat exchanger include a left and right two-pass heat exchanger in which one of the first path and the second path is disposed on the left side and the other is disposed on the right side. The connection device according to claim 2 or 3.   7. The connection device according to claim 1, wherein a width of the connection device main body in an axial direction is equal to or larger than a diameter of an opening through which the fluid flows in and out.   The said connection apparatus main body was provided with the flange part for connecting with the tube sheet of a said 1st heat exchanger and a said 2nd heat exchanger in the both ends of an axial direction, Any one of Claim 1 thru | or 7 characterized by the above-mentioned. A connection device according to claim 1.   9. The connection device main body according to claim 1, wherein the main body of the connection device can be rotated 360 [deg.] With respect to the first heat exchanger and the second heat exchanger according to a form of a heat exchanger path. The connection apparatus as described in any one.   The connection device according to any one of claims 1 to 9, wherein the heat exchanger is an evaporator or a condenser of a compression refrigerator.   The evaporator and / or condenser of the first refrigerator and the evaporator and / or condenser of the second refrigerator are connected to each other by the connection device according to any one of claims 1 to 9. Compressive refrigerator system characterized by

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