JP6784632B2 - Connection device for heat exchanger - Google Patents

Description

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

Conventionally, a refrigerator system equipped with a plurality of refrigerators composed of 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 a pipe, and two units are connected. The condensers are connected in series by piping. Therefore, the cold water is sequentially cooled by the heat of vaporization of the refrigerant in the two evaporators, and the cooling water sequentially cools the refrigerant vapor in the two condensers. By supplying the cold water and the cooling water in series to a plurality of refrigerators in this way, the average evaporation temperature can be increased and the average condensation temperature can be decreased. (See paragraphs [0022] and [0023] of Patent Document 1)

Japanese Unexamined Patent Publication No. 2007-183077

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

The present invention has been made in view of the above circumstances, and by connecting two heat exchangers with a connecting device and removing the connecting pipes of the heat exchangers, the pressure loss can be reduced and the pressure loss can be reduced. It is an object of the present invention to provide a connection device for a heat exchanger in which the longitudinal dimension of the refrigerator system can be shortened and the installation space can be minimized.

In order to achieve the above object, the heat exchanger connecting device of the present invention is a connecting device for connecting two-pass shell-and-tube heat exchangers of two refrigerating machines, and is substantially cylindrical or abbreviated. A partition plate that constitutes a flow path by partitioning the inside of the square tubular connecting device main body, and a first opening that allows fluid to flow in and out of one of the two-pass first heat exchangers in the connecting device main body. And a second opening for allowing fluid to flow in and out are provided in one pass of the two-pass second heat exchanger, and the connecting device main body is partitioned by the partition plate to form four chambers. The room is one of 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, and one of the second heat exchangers. It consists of a third room communicating with the path and a fourth room communicating with the other path of the second heat exchanger, and a connecting flow path is provided by the partition plate to provide the second room and the third room. The fluid communicates with the room in the order of the first pass of the first heat exchanger, the second pass of the first heat exchanger, the first pass of the second heat exchanger, and the second pass of the second heat exchanger. It is characterized in that the first heat exchanger and the second heat exchanger can be connected so as to flow .

According to the present invention, by crossing the flow paths inside the connecting device, the fluid is transferred to the lower flow path of the first heat exchanger, the upper flow path of the first heat exchanger, and the lower side of the second heat exchanger. The flow can flow in the order of the flow path and the upper flow path of the second heat exchanger, and the temperature regions of the first heat exchanger and the second heat exchanger are different, the tube heat transfer by the heat exchanger is improved, and the performance of the refrigerator. And because the temperature difference between the inlet and outlet of cold water is large, the power consumption of the main motor can be reduced.

According to a preferred reference example of the present invention, the connecting device main body is partitioned by the partition plate to form three chambers, and the three chambers communicate with one path of the first heat exchanger. Room, 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. It consists of a room so that the fluid flows in the order of the first pass of the first heat exchanger, the second pass of the first heat exchanger, the second pass of the second heat exchanger, and the first pass of the second heat exchanger. It is characterized in that the first heat exchanger and the second heat exchanger can be connected to each other.
According to the above reference example , the width of one opening for fluid inflow and outflow is larger than that of the connecting device having the above four chambers, but the refrigerator has the effect of a double refrigeration cycle. The installation space can be reduced.

According to a preferred embodiment of the present invention, in the first heat exchanger and the second heat exchanger, one of the first pass and the second pass is arranged on the upper side and the other is arranged on the lower side. It is characterized by consisting of a path heat exchanger. According to the present invention, two existing heat exchangers having a first pass and a second pass can be connected vertically.
According to a preferred embodiment of the present invention, the first heat exchanger and the second heat exchanger are evaporators of a compression refrigerator, and the fluid is either a first heat exchanger or a second heat exchanger. It is characterized by flowing in the order of the first pass on the lower side of one side, the second pass on the upper side of the same heat exchanger, the first pass on the lower side of the other heat exchanger, and the second pass on the upper side of the same heat exchanger. And.

According to a preferred embodiment of the present invention, in the first heat exchanger and the second heat exchanger, either one of the first pass and the second pass is the first heat exchanger and the second heat exchanger. It is characterized by consisting of left and right two-pass heat exchangers arranged on the left side in a longitudinal section perpendicular to the longitudinal direction and the other arranged on the right side in the longitudinal section . According to the present invention, two existing heat exchangers having a first pass and a second pass can be connected to the left and right.
According to a preferred embodiment of the present invention, the axial width of the connecting device main body is equal to or larger than the diameter of the opening through which the fluid flows in and out.

According to a preferred embodiment of the present invention, the connecting device main body is provided with flange portions at both ends in the axial direction for connecting to the tube plates of the first heat exchanger and the second heat exchanger. And.
By providing the flange portion in this way, the two heat exchangers can be easily connected.
According to a preferred embodiment of the present invention, since the connecting device main body has a symmetrical structure, 360 with respect to the first heat exchanger and the second heat exchanger corresponding to the form of the heat exchanger path. ° It is characterized by being rotatable.
In this way, since the connecting device main body can be mounted at any angle, the degree of freedom of the mounting location of the equipment-side piping for cold water or cooling water can be increased.
According to a preferred embodiment 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 connecting device described above. It is characterized by that.

According to the present invention, by connecting two heat exchangers by a connecting device and removing the connecting pipes of the heat exchangers, the flow of cooling water and cold water becomes smooth, and the pressure loss is reduced to reduce the pump. Power consumption can be reduced. In addition, 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 connecting device, the fluid is transferred to the lower flow path of the first heat exchanger, the upper flow path of the first heat exchanger, and the lower flow path of the second heat exchanger. The heat 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 electric motor can be reduced.

FIG. 1 is a diagram showing a first embodiment of a heat exchanger connecting device according to the present invention, and is an exploded perspective view showing a connecting device and two heat exchangers to be connected. FIG. 2 is a perspective view of a heat exchanger connecting device. FIG. 3 is a front view showing a state in which the first heat exchanger and the second heat exchanger are connected by a connecting device. FIG. 4 is a perspective view of the connecting device as viewed from the side of the first heat exchanger. FIG. 5 is a perspective view of the connecting device as viewed from the side of the first heat exchanger. FIG. 6 is a perspective view of the connecting device as viewed from the side of the second heat exchanger. FIG. 7 is a perspective view of the connecting device as viewed from the side of the second heat exchanger. FIG. 8 is a diagram showing a second embodiment of the heat exchanger connecting device according to the present invention, and is an exploded perspective view showing the connecting device and the two heat exchangers to be connected. FIG. 9 is a perspective view of the heat exchanger connecting device. FIG. 10 is a front view showing a state in which the first heat exchanger and the second heat exchanger are connected by a connecting device. FIG. 11 is a perspective view of the connecting device as viewed from the side of the first heat exchanger. FIG. 12 is a perspective view of the connecting device as viewed from the side of the first heat exchanger. FIG. 13 is a perspective view of the connecting device as viewed from the side of the second heat exchanger. FIG. 14 is a perspective view of the connecting device as viewed from the side of the second heat exchanger. FIG. 15 (a) is a diagram showing a method of connecting the first evaporator and the second evaporator as a single refrigeration cycle, and FIG. 15 (b) is a diagram showing a first evaporator and a 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 the cold water or cooling water temperature-specific entropy of the single refrigeration cycle and the double refrigeration cycle. 17 (a) and 17 (b) show the appearance of a compression 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 the structure, FIG. 17A is a front view, and FIG. 17B is a rear view.

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

The first heat exchanger 1-1 and the second heat exchanger 1-2 are two-pass shell-and-tube heat exchangers each having two heat transfer tube groups inside. The first heat exchanger 1-1 and the second heat exchanger 1-2 are upper and lower two-pass heat exchangers in which one of the first pass and the second pass is arranged on the upper side and the other is arranged on the lower side. It consists of two left and right heat exchangers, one of which is located on the left side and the other is located on the right side. The connecting device 2 is arranged 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 turning back a path at an end opposite to the connecting device 2.

As shown in FIGS. 1 and 2, the connecting device 2 includes a substantially cylindrical connecting device main body 21, and four chambers are formed by partitioning the inside of the connecting device main body 21 with a partition plate 22. Here, the connecting device main body 21 may have a substantially square tubular shape. The four rooms are a first room R1 communicating with one path of the first heat exchanger 1-1, a second room R2 communicating with the other path of the first heat exchanger 1-1, and a second room. 2 It consists of a third room R3 communicating with one path of the heat exchanger 1-2 and a fourth room R4 communicating with the other path of the second heat exchanger 1-2. A connection flow path 22p is provided on the partition plate 22 to communicate the second room R2 and the third room R3. In the connecting device main body 21, there is a first opening A1 for allowing fluid to flow in and out of one of the two-pass first heat exchanger 1-1, and one of the two-pass second heat exchanger 1-2. A second opening A2 for allowing fluid to flow 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 connecting device main body 21 is set to be equal to or larger than the diameter of the openings A1 and A2 through which the fluid flows in and out. The connecting device main body 21 is provided with 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. There is.

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 connecting device main body 21 are fastened by fasteners 15 such as bolts and nuts, and the second heat exchanger The tube plate 12 of 1-2 and the flange portion 21f of the connecting device main body 21 are fastened by fasteners 15 such as bolts and nuts. As a result, the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected and integrated by the connecting device 2. At the time of this integration, the connecting device main body 21 is the first heat exchanger 1-1 and the first heat exchanger 1-1 corresponding to the form of the heat exchanger path (that is, the form of the upper and lower two paths, the form of the left and right two paths, etc.). 2 It can rotate 360 ° with respect to the heat exchanger 1-2. By providing the flange portion in this way, the two heat exchangers can be easily connected. Further, since the connecting device main body can be mounted at any angle, the degree of freedom of the mounting location of the equipment-side piping for cold water or cooling water can be increased.

Next, the flow of the 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 the arrows in FIGS. 1 and 3, the fluid flows from the first opening A1 into the first chamber R1 in the connecting device main body 21, and the first pass of the first heat exchanger 1-1, the first. 1 Flows in the order of the second pass of the heat exchanger 1-1, flows into the second chamber R2 in the connecting device main body 21, then passes through the connecting flow path 22p of the partition plate 22 and enters the third chamber R3. It flows in in the order of the first pass of the second heat exchanger 1-2 and the second pass of the second heat exchanger 1-2, flows into the fourth chamber R4 in the connecting device main body 21, and is the second. It flows out from the opening A2.

As described above, in the connecting device 2, the fluid is the first pass of the first heat exchanger 1-1, the second pass of the first heat exchanger 1-1, and the first pass 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 pass of the second heat exchanger 1-2.

Next, the configuration of the connecting device 2 for forming the four chambers R1, R2, R3, R4 and the connecting flow path 22p inside the substantially cylindrical connecting device main body 21 will be described with reference to FIGS. 4 to 7. To do. Four partition plates 22 are provided to form the four chambers R1, R2, R3, and R4 inside the connecting device main body 21, but in the following description, the four partition plates 22 are distinguished. Therefore, A, B, C, and D are added to reference numeral 22 for description.

4 and 5 are perspective views of the connecting device 2 as viewed from the side of the first heat exchanger 1-1. As shown in FIGS. 4 and 5, the connecting device 2 includes a first room R1 and a second room R2 on the first heat exchanger side. The first room R1 is a space surrounded by a substantially semicircular plate-shaped partition plate 22A, a substantially triangular plate-shaped partition plate 22B, and an inner peripheral surface of the connecting device main body 21. The second room R2 is a space surrounded by a substantially semicircular plate-shaped partition plate 22C, the substantially triangular plate-shaped partition plate 22B, and an inner peripheral surface of the connecting device main body 21. The partition plate 22B has a shape of a substantially right triangle, the base thereof is located on the first heat exchanger side, and the 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 side of the second heat exchanger 1-2. As shown in FIGS. 6 and 7, the connecting device 2 includes a third room R3 and a fourth room R4 on the second heat exchanger side. The third room R3 is a space surrounded by a substantially semicircular plate-shaped partition plate 22A, a substantially triangular plate-shaped partition plate 22D, and an inner peripheral surface of the connecting device main body 21. The fourth room R4 is a space surrounded by a substantially semicircular plate-shaped partition plate 22C, the substantially triangular plate-shaped partition plate 22D, and an inner peripheral surface of the connecting device main body 21. The second opening A2 communicates with the fourth room R4. The partition plate 22D has a shape of a substantially right triangle, the base thereof is located on the second heat exchanger side, and the hypotenuse is located on the first heat exchanger side. As shown in FIG. 7, the connecting flow path 22p, which is a substantially triangular opening, is formed by the hypotenuse of the partition plate 22D, the hypotenuse of the partition plate 22B, and the inner peripheral surface of the connecting device main body 21. The connection flow path 22p consists of a base having a dimension close to the axial width of the connection device main body 21 and a triangular opening having a height of 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 (inner diameter of the connecting device main body 21) is significantly larger than the pipe diameter (diameter of the opening A1 or opening A2), the cross-sectional area of the connecting flow path 22p is set to the first opening A1 or the first opening. It can be equal to or larger than the flow path cross-sectional area of the opening A2 of 2.
Therefore, the axial width of the connecting device main body 21 may be the width obtained by adding the width required for attaching the openings A1 and A2 by welding or the like to the diameter of the opening A1 or the opening A2, and the connecting device main body 21 is compact. Can be.

As shown in FIGS. 4 to 7, in the connecting device 2 of the present invention, by providing four partition plates 22A, 22B, 22C, 22D inside the connecting device main body 21, the first heat exchanger side is provided. Two chambers R1 and R2 are formed, and two chambers R3 and R4 are formed on the second heat exchanger side. As a result, 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 chamber R2 is communicated with the other path. Room R3 can be communicated with one path of the second heat exchanger 1-2, and room R4 can be communicated with the other path of the second heat exchanger 1-2.
Here, when the first heat exchanger and the second heat exchanger of the present invention are the evaporators of the compression refrigerator, cold water is applied to the lower side of either the first heat exchanger or the second heat exchanger. It is preferable to flow in the order of the first pass, the second pass on the upper side of the same heat exchanger, the first pass on the lower side of the other heat exchanger, and the second pass on the upper side of the same heat exchanger. By flowing cold water from the lower pass to the upper pass of the first heat exchanger and the second heat exchanger, the temperature of the cold water in the lower pass of the first heat exchanger and the second heat exchanger becomes high. The liquid refrigerant easily evaporates from the water, and the liquid head of the refrigerant liquid in the second pass 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 pass on the lower side of the can body. Therefore, it is easy to evaporate. Therefore, cold water having a high temperature flows from the lower first pass of the heat exchanger to the upper second pass, which facilitates boiling of the liquid refrigerant, which is preferable as an evaporator in terms of efficiency.

FIG. 8 is a diagram showing a second embodiment of the heat exchanger connecting device according to the present invention, and is an exploded perspective view showing the connecting device and the two heat exchangers to be connected. FIG. 9 is a perspective view of the heat exchanger connecting device.
As shown in FIG. 8, the connecting device 2 is arranged between the two heat exchangers to be connected, which are the first heat exchanger 1-1 and the second heat exchanger 1-2. FIG. 8 shows a state before the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected by the connecting device 2. Each heat exchanger 1-1, 1-2 has a large number in a space formed by a cylindrical can body 11 and tube plates 12 and 12 provided at both ends of the can body 11. A group of heat transfer tubes (not shown) in which heat transfer tubes (not shown) are arranged in a staggered pattern are arranged.

The first heat exchanger 1-1 and the second heat exchanger 1-2 are two-pass shell-and-tube heat exchangers each having two heat transfer tube groups inside. The first heat exchanger 1-1 and the second heat exchanger 1-2 are upper and lower two-pass heat exchangers in which one of the first pass and the second pass is arranged on the upper side and the other is arranged on the lower side. It consists of two left and right heat exchangers, one of which is located on the left side and the other is located on the right side. The connecting device 2 is arranged 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 turning back a path at an end opposite to the connecting device 2.

As shown in FIGS. 8 and 9, the connecting device 2 includes a connecting device main body 21 having a substantially cylindrical shape, and three chambers are formed by partitioning the inside of the connecting device main body 21 with a partition plate 22. The connecting device main body 21 may have a substantially square tubular shape. The three chambers are one of the first chamber R1 communicating with one path of the first heat exchanger 1-1, the other path of the first heat exchanger 1-1, and the second heat exchanger 1-2. It is composed of a second room R2 communicating with the path of the second heat exchanger 1-2 and a third room R3 communicating with the other path of the second heat exchanger 1-2. In the connecting device main body 21, there is a first opening A1 for allowing fluid to flow in and out of one of the two-pass first heat exchanger 1-1, and one of the two-pass second heat exchanger 1-2. A second opening A2 for allowing fluid to flow 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 diameters of the first opening A1 and the diameters of the second openings A2 in order to secure the space required for mounting the openings A1 and A2 by welding or the like. It is set. The connecting device main body 21 is provided with 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. There is.

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 connecting 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 connecting device main body 21 are fastened by fasteners 15 such as bolts and nuts, and the second heat exchanger The tube plate 12 of 1-2 and the flange portion 21f of the connecting device main body 21 are fastened by fasteners 15 such as bolts and nuts. As a result, the first heat exchanger 1-1 and the second heat exchanger 1-2 are connected and integrated by the connecting device 2. At the time of this integration, the connecting device main body 21 is the first heat exchanger 1-1 and the first heat exchanger 1-1 corresponding to the form of the heat exchanger path (that is, the form of the upper and lower two paths, the form of the left and right two paths, etc.). 2 It can rotate 360 ° with respect to the heat exchanger 1-2.

Next, the flow of the 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 connecting device main body 21, and the first pass of the first heat exchanger 1-1, the first. 1 It flows in the order of the second pass of the heat exchanger 1-1 and flows into the second chamber R2 in the connecting device main body 21, and then the second pass of the second heat exchanger 1-2 and the second heat exchanger. It flows in the order of the first pass of 1-2, flows into the third room R3 in the connecting device main body 21, and flows out from the second opening A2 to the outside.

As described above, in the connecting device 2, the fluid is the first pass of the first heat exchanger 1-1, the second pass of the first heat exchanger 1-1, and the second pass 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 pass of the second heat exchanger 1-2. The connecting device 2 of the second embodiment has a width larger than that of the connecting device 2 of the first embodiment by one opening for inflow and outflow of fluid, but has the effect of a double refrigeration cycle. The installation space of the refrigerator can be reduced.

Next, the configuration of the connecting device 2 for forming the three chambers R1, R2, and R3 inside the substantially cylindrical connecting device main body 21 will be described with reference to FIGS. 11 to 14. Two partition plates 22 are provided to form the three chambers R1, R2, and R3 inside the connecting device main body 21, but in the following description, in order to distinguish the two partition plates 22. A and B will be added to reference numeral 22 for description.

11 and 12 are perspective views of the connecting device 2 as viewed from the side of the first heat exchanger 1-1. 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 R1 is a space surrounded by a substantially semicircular plate-shaped partition plate 22A, a substantially rectangular plate-shaped partition plate 22B, and an inner peripheral surface of the connecting device main body 21. The second room R2 is a space surrounded by the rectangular plate-shaped partition plate 22B and the inner peripheral surface of the connecting device main body 21. The first opening A1 communicates with the first room R1.

13 and 14 are perspective views of the connecting device 2 as viewed from the side of the second heat exchanger 1-2. As shown in FIGS. 13 and 14, the connecting 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. 11 and 12. The third room R3 is a space surrounded by a substantially semicircular plate-shaped partition plate 22A, a substantially rectangular plate-shaped partition plate 22B, and an inner peripheral surface of the connecting device main body 21. The second opening A2 communicates with the third room R3.

As shown in FIGS. 11 to 14, in the connecting device 2 of the present invention, by providing the two partition plates 22A and 22B inside the connecting device main body 21, two chambers R1 are provided on the first heat exchanger side. , R2 are formed, and two chambers R2 and R3 are formed on the second heat exchanger side. As a result, 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 is generated. The third chamber R3 can be communicated with one pass of the exchanger 1-2 and the other path of the second heat exchanger 1-2.

Next, the difference in efficiency between the single refrigeration cycle and the double refrigeration cycle in the refrigerator system connecting the two-pass shell-and-tube heat exchangers of the 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. 15A shows a method of connecting the first evaporator and the second evaporator as a single refrigeration cycle, and FIG. 15B shows a method of connecting the first evaporator and the second evaporator as a double refrigeration cycle. Shows the connection method. The connection method shown in FIG. 15B is carried out in the first embodiment of the present invention.

(1) In the connection method shown in FIG. 15 (a), the cold water is the upper pass of the first evaporator, the upper pass of the second evaporator, the lower pass 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 the first pass on the lower side of the first evaporator, the second pass on the upper side of the first evaporator, and the second pass on the lower side of the second evaporator. It flows in the order of 1 pass and the 2nd pass on the upper side of the 2nd 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). The connection method 1 and the connection method 2 can be considered as follows.
In the connection method 1, cold water is flowed through the first evaporator and the second evaporator, and cooling water is flowed through the first condenser and the second condenser (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 similarly, the temperature and pressure inside the first and second evaporators are almost the same, so there are two single cycles. It's the same as being.
In the connection method 2, cold water is flowed through the first evaporator and the second evaporator, and cooling water is flowed through the first condenser and the second condenser (not shown) in the same manner as the evaporator. The temperature and pressure inside the evaporator and the second evaporator are different, and similarly, the temperature and pressure inside the first and second evaporators are different, so 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 showing the relationship between cold water or cooling water temperature-specific entropy in a single refrigeration cycle and a double refrigeration cycle (representing compression work in an ideal cycle). The dashed line is the single cycle and the solid line is the double refrigeration cycle. The double refrigeration cycle is composed of two cycles, high pressure and low pressure, and the upper side shows the high pressure cycle and the lower side shows the 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 differential pressure of the discharge is reduced), and the efficiency can be improved. The area of the shaded area in FIG. 16 is the difference in compression work between the single refrigeration cycle and the double refrigeration cycle.
In this way, when connecting two heat exchangers, the connection as a double refrigeration cycle has a smaller compression work than the connection as a single refrigeration cycle, and as a result, the power consumption of the traction motor can be reduced. ..

17 (a) and 17 (b) show the appearance of a compression 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 the structure, FIG. 17A is a front view, and FIG. 17B 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 connecting 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 connecting device 2 of the present invention.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various different forms within the scope of the technical idea.

1-1 1st heat exchanger 1-2 2nd heat exchanger 2 Connection device 11 Tube body 12 Tube plate 13 Water chamber 15 Fastener 21 Connection device body 21f Flange part 22A, 22B, 22C, 22D Partition plate 22p Connection flow Road 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 room R2 2nd Room R3 3rd room R4 4th room REF1 1st refrigerator REF2 2nd refrigerator

Claims (9)

A connecting device for connecting two-pass shell-and-tube heat exchangers of two refrigerators.
A partition plate that constitutes a flow path by partitioning the inside of a substantially cylindrical or substantially square tubular connecting device main body,
A first opening for allowing fluid to flow in and out of one pass of the two-pass first heat exchanger and a second opening for allowing fluid to flow in and out of one pass of the two-pass second heat exchanger into the connecting device main body. and an opening is provided for,
Four rooms are formed by partitioning the connecting device main body with the partition plate, and the 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,
It consists of a fourth room that communicates with the other path of the second heat exchanger.
A connection flow path is provided by the partition plate to communicate the second room and the third room.
The first heat exchange so that the fluid flows in the order of the first pass of the first heat exchanger, the second pass of the first heat exchanger, the first pass of the second heat exchanger, and the second pass of the second heat exchanger. A connecting device characterized in that the device and the second heat exchanger can be connected. 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 pass and the second pass is arranged on the upper side and the other is arranged on the lower side. The connecting device according to claim 1 . The first heat exchanger and the second heat exchanger are the evaporators of a compression refrigerator, and the fluid is the lower first pass of either the first heat exchanger or the second heat exchanger. 2. The connecting device according to claim 2, wherein the second pass on the upper side of the same heat exchanger, the first pass on the lower side of the other heat exchanger, and the second pass on the upper side of the same heat exchanger flow in this order. .. The first heat exchanger and the second heat exchanger are on the left side in a vertical cross section in which either one of the first pass and the second pass is perpendicular to the longitudinal direction of the first heat exchanger and the second heat exchanger. The connecting device according to claim 1 , wherein the connecting device is composed of a heat exchanger having two paths on the left and right, which is arranged on the right side in the vertical cross section. The connecting device according to any one of claims 1 to 4 , wherein the width of the connecting device main body in the axial direction is equal to or larger than the diameter of the opening through which the fluid flows in and out. Any of claims 1 to 5 , wherein the connecting device main body is provided with 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. The connection device according to one item. The connecting device main body, corresponding to the path in the form of a heat exchanger according to claim 1 to 6, characterized in that is rotatable 360 ° with respect to the second heat exchanger and the first heat exchanger The connecting device according to any one item. The connecting device according to any one of claims 1 to 7 , wherein the heat exchanger is an evaporator or a condenser of a compression refrigerator. The evaporator and / or the condenser of the first refrigerator and the evaporator and / or the condenser of the second refrigerator are connected to each other by the connecting device according to any one of claims 1 to 7. A compression refrigerator system featuring.

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