JP2021050871A - Heat exchanger, double-cycle type refrigeration machine including the same and method for manufacturing heat exchanger - Google Patents

Abstract

To provide a heat exchanger that can prevent contamination generated in welding inside a shell from remaining therein as much as possible.SOLUTION: A heat exchanger includes: a tube plates 20, 21 partitioning a refrigerant space in a water chamber and a shell 7 and supporting a heat transfer pipe through which a heat exchange medium flows; a circumferential backing metal 26 provided in a longitudinal abutment weld part where an end of the shell 7 in a longitudinal direction abuts on the tube plates 20, 21 and provided on an inner peripheral side of the shell 7; and a vertical-axial backing metal 22 provided in a circumferential abutment weld part where an end of the shell 7 in a circumferential direction abuts on a partition plate 8 and provided on an inner peripheral side of the shell 7.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a heat exchanger of a double cycle refrigerator, a double cycle refrigerator equipped with the heat exchanger, and a method for manufacturing the heat exchanger.

In order to prevent global warming, a refrigerator having a high COP (coefficient of performance) is required, and a double cycle type turbo chiller has been proposed as one of the means.

The double cycle type turbo chiller has a configuration in which the water systems (cold water system and cooling water system) of the two turbo chillers are connected in series. As a result, the head difference between the condenser and the evaporator can be reduced as compared with the case where the refrigerator is operated by one unit, and the performance can be improved.

When adopting such a double-cycle turbo chiller, there is a method of dividing the inside of one shell of the condenser and the evaporator into two systems in which each refrigerant flows independently in order to reduce the installation area. .. In this case, a structure is adopted in which a partition plate is installed inside the shell to separate the space inside the shell into two (see Patent Document 1).

When the inside of the shell is divided by using a partition plate as described above, if the shell is large, an operator can enter the inside and weld the partition plate to the inner peripheral surface of the shell. If it is small, workers cannot enter inside. Therefore, Patent Document 1 proposes to form a split portion in the longitudinal direction of the shell and weld and fix the split portion in the longitudinal direction to the partition plate. As a result, welding work can be performed from the outer peripheral side of the shell, and even a small shell can be supported.

Japanese Patent No. 5448902

However, even if welding can be performed from the outer peripheral side of the shell, the inside of the shell cannot be easily accessed after welding, so that contamination such as spatter generated during welding may remain inside the shell. is there.

The present disclosure has been made in view of such circumstances, and is a heat exchanger capable of preventing contamination generated during welding from remaining inside the shell as much as possible, and a double-cycle refrigerator equipped with the heat exchanger. It is an object of the present invention to provide a method for manufacturing a machine and a heat exchanger.

In order to solve the above problems, the heat exchanger of the present disclosure is a double cycle in which a first refrigerating machine constituting a refrigerating cycle with a first refrigerant and a second refrigerating machine constituting a refrigerating cycle with a second refrigerant are combined. A shell used in a condenser and / or an evaporator of a type refrigerator to form a refrigerant space inside, and a partition plate for dividing the refrigerant space in the shell into the first refrigerant and the second refrigerant. A heat exchange medium chamber provided at the end of the shell and the partition plate into which the heat exchange medium is introduced, and a heat transfer tube through which the heat exchange medium flows while partitioning the heat exchange medium chamber and the refrigerant space in the shell are supported. A first backing metal provided at the longitudinal abutting welded portion where the end portion in the longitudinal direction of the shell is abutted against the tube plate, and provided on the inner peripheral side of the shell. It has.

The method for manufacturing the heat exchanger of the present disclosure is a condensation of a double cycle refrigerating machine in which a first refrigerating machine constituting a refrigerating cycle with a first refrigerant and a second refrigerating machine constituting a refrigerating cycle with a second refrigerant are combined. A shell used for a vessel and / or an evaporator to form a refrigerant space inside, a partition plate for dividing the refrigerant space in the shell into the first refrigerant and the second refrigerant, and the shell and the partition. A heat exchange medium chamber provided at the end of the plate into which the heat exchange medium is introduced, a tube plate that separates the heat exchange medium chamber from the refrigerant space in the shell and supports a heat transfer tube through which the heat exchange medium flows. A method of manufacturing a heat exchanger comprising the above, wherein the first backing metal is placed at a position corresponding to a longitudinal abutting welded portion in which an end portion of the shell in the longitudinal direction is abutted against the pipe plate. After fixing to the plate and superimposing the inner peripheral side of the end portion in the longitudinal direction of the shell on the first back metal, the shell and the pipe plate are welded and fixed from the outer peripheral side of the shell.

Since the backing metal is used for abutt welding, it is possible to prevent contamination generated during welding from remaining inside the shell as much as possible.

It is a schematic block diagram which showed the refrigerant circuit of the double cycle type turbo chiller which concerns on one Embodiment of this disclosure. It is sectional drawing which showed the evaporator of FIG. It is a perspective view which showed the appearance of the double cycle type turbo chiller which concerns on one Embodiment of this disclosure. It is a perspective view which showed the state before attaching the shell of the evaporator which concerns on one Embodiment of this disclosure. It is a side view which showed the process of connecting a partition plate and a pipe plate. FIG. 5A is a plan view of FIG. 5A. It is a side view which showed the process of connecting a backing metal. FIG. 6A is a plan view of FIG. 6A. It is a side view which showed the process of connecting a shell. FIG. 7A is a plan view of FIG. 7A. It is a side view which showed the deformation example of a tube plate. It is a side view which showed the deformation example of a tube plate. It is a top view which showed the modification of the welding of a partition plate and a pipe plate. It is a top view which showed the modification of the welding of a partition plate and a pipe plate.

Hereinafter, one embodiment of the present disclosure will be described.
FIG. 1 shows a double-cycle turbo chiller in which two refrigerators having two independent refrigerant systems are combined. Each refrigerator is a Unit A turbo chiller (1st refrigerator, hereinafter referred to as "A") and a Unit B turbo chiller (2nd refrigerator, hereinafter referred to as "B"), which are equivalent to each other. It is said to be the capacity of.

As shown in the figure, the double-cycle turbo chiller is a condenser (heat exchanger) 3 in which the condenser 3a of Unit A and the condenser 3b of Unit B are integrated, and the evaporation of Unit A. It is provided with an evaporator (heat exchanger) 4 in which the evaporator 4a and the evaporator 4b of Unit B are integrated.

The Unit A condenser 3a and the Unit B condenser 3b share a cooling water system by the heat transfer tubes 9a and 9b for cooling water that are communicated with each other. Further, the Unit A evaporator 4a and the Unit B evaporator 4b share a chilled water system by the chilled water heat transfer tubes 10a and 10b that are communicated with each other.

The Unit A condenser 3a is arranged on the upstream side of the Unit B condenser 3b in the flow direction of the cooling water. The cooling water flows into the Unit A condenser 3a at, for example, 32 ° C., and flows out of the Unit B condenser 3b, for example, at 37 ° C.

The Unit A evaporator 4a is arranged on the downstream side in the cold water flow direction with respect to the Unit B evaporator 4b. The cold water flows into the Unit B evaporator 4b at, for example, 12 ° C., and flows out of the Unit A evaporator 4a, for example, at 7 ° C.

Unit A is driven by, for example, the unit A motor 2a whose rotation speed is variable by an inverter device to compress the refrigerant, and the unit A turbo compressor 1a and the high temperature and high pressure gas refrigerant compressed by the unit A turbo compressor 1a. The Unit A condenser 3a that condenses, the Unit A expansion valve 12a that expands the liquid refrigerant condensed by the Unit A condenser 3a, and the Unit A evaporator that evaporates the liquid refrigerant expanded by the Unit A expansion valve 12a. It has 4a.

Similar to Unit A, Unit B is also driven by, for example, the Unit B motor 2b whose rotation speed is variable by an inverter device, and compresses the refrigerant at the Unit B turbo compressor 1b and the high temperature compressed by the Unit B turbo compressor 1b. Evaporates the liquid refrigerant expanded by the Unit B condenser 3b that condenses the high-pressure gas refrigerant, the Unit B expansion valve 12b that expands the liquid refrigerant condensed by the Unit B condenser 3b, and the Unit B expansion valve 12b. It is equipped with a Unit B evaporator 4b.

The condenser 3 is a shell-and-tube heat exchanger, and has a shell 5 that constitutes an outer shell and forms a refrigerant space inside, and a refrigerant system of Unit A and a refrigerant system of Unit B inside the shell 5. It is provided with a partition plate 6 for dividing and partitioning.
The evaporator 4 has the same configuration as the condenser 3, and is a shell-and-tube heat exchanger. The shell 7 that constitutes the outer shell and forms the refrigerant space inside, and the inside of the shell 7 It is provided with a partition plate 8 that separates and partitions the refrigerant system of Unit A and the refrigerant system of Unit B.

FIG. 2 shows a vertical cross-sectional view of the evaporator 4. As shown in the figure, the refrigerant space in the shell 7 is divided into two at the center by the partition plate 8. Water chambers (heat exchange medium chambers) 10 and 11 are provided at both ends of the shell 7, respectively. The internal space of the shell 7 is closed by pipe plates 20 and 21 from both ends, and the water chambers 10 and 11 are connected to these pipe plates 20 and 21.
The water chamber 10 on one end side (right side in the figure) of the shell 7 is divided into an inlet water chamber 13 and an outlet water chamber 14 by a water chamber partition plate 15. The water chamber 11 on the other end side (left side in the figure) of the shell 7 is made into one space so that the cold water that has flowed in can be turned back and flow out. A cold water heat transfer tube 10a through which cold water flows is provided between the inlet water chamber 13 and the water chamber 11, and a cold water transmission through which cold water flows between the water chamber 11 and the outlet water chamber 14. A heat tube 10b is provided. The cold water heat transfer tubes 10a and 10b are supported by tube plates 20 and 21 arranged at both ends. Although the heat transfer tubes 10a and 10b for cold water are shown one by one for simplification in the figure, a plurality of heat transfer tubes 10a and 10b are actually provided in parallel.
The condenser 3 is also different in that the cooling water flows instead of the cold water, but has substantially the same configuration as the evaporator 4.

FIG. 3 shows a perspective view of the entire double-cycle turbo chiller having the above configuration. As shown in the figure, the evaporator 4 is installed below, and two turbo compressors 1a and 1b are installed side by side in the axial direction above the evaporator 4. The condenser 3 is installed diagonally above the evaporator 4 and diagonally below the turbo compressors 1a and 1b.
In the figure, reference numerals 33 and 34 are water chambers for cooling water provided at both ends of the condenser 3.

FIG. 4 shows a state before the shell 7 of the evaporator 4 is attached. In the following description, since the structure of the condenser 3 is the same as that of the evaporator 4, the description thereof will be omitted.

The partition plate 8 is inserted so that both ends penetrate the slits 20a and 21a formed in the tube plates 20 and 21, respectively. The slits 20a and 21a penetrate the tube plates 20 and 21 in the plate thickness direction. The slits 20a and 21a are formed in the vertical direction of the tube plates 20 and 21, and both ends thereof are closed. The partition plate 8 is fixed to the pipe plates 20 and 21 by welding. The slits 20a and 21a may be formed at a predetermined angle with respect to the vertical direction.

In the longitudinal direction of the partition plate 8, upper and lower axial backing metal (second backing metal) 22 are provided on the upper and lower sides when the pipe plates 20 and 21 are viewed from the front. The backing metal 22 in the vertical axis direction is made of a metal such as iron, and is a linear rod-shaped body extending between the tube plates 20 and 21. The cross section of the backing metal 22 in the vertical axis direction is, for example, a flat rectangular shape. The eccentric plane in the cross section of the backing metal 22 in the vertical axis direction is arranged so as to face outward in the radial direction when centered on the central axis of the shell 7 to be attached later. One vertical backing metal 22 is provided on each of the upper and lower portions of the partition plate 8 (see, for example, FIGS. 6A and 6B). Therefore, four back pads 22 in the vertical axis direction are provided. Each vertical axis direction backing metal 22 is provided at a position corresponding to the inner diameter of the shell 7 to be attached later (see, for example, FIG. 7A). The backing metal 22 in the vertical axis direction is fixed to the partition plate 8 by welding. The backing metal 22 in the vertical axis direction may be fixed to the partition plate 8 by temporary fixing such as spot welding.

In the longitudinal direction of the partition plate 8, left and right axial backing metal (third backing metal) 24 are provided on each of the left and right when the pipe plates 20 and 21 are viewed from the front. The backing metal 24 in the left-right axial direction is made of metal such as iron, and is a straight rod-shaped body extending between the tube plates 20 and 21. The cross section of the left and right axial backing metal 24 is, for example, a flat rectangular shape. For example, when the eccentric plane in the cross section of the left and right axial backing metal 24 is centered on the central axis of the shell 7 to be attached later, It is arranged so as to face outward in the radial direction. Each left-right axial backing metal 24 is provided at a position corresponding to the inner diameter of the shell 7 to be attached later (see, for example, FIG. 7A). Both ends of the left-right axial backing metal 24 are fixed to each of the circumferential backing metal 26, which will be described later, by welding. The left and right axial backing metal 24 may be fixed to the circumferential backing metal 26 by temporary fixing such as spot welding. Further, the backing metal 24 in the left-right axial direction may be temporarily fixed to the tube plates 20 and 21.

Circumferential backing metal (first backing metal) provided on each of the tube plates 20 and 21 so as to connect the end portion of the vertical axial backing metal 22 and the end portion of the left and right axial backing metal 24. Fri) 26 is provided. The circumferential back metal 26 is made of a metal such as iron, and is a semicircular curved body symmetrically provided with the partition plate 8 interposed therebetween. The cross section of the circumferential back metal 26 is, for example, a flat rectangular shape. The eccentric plane in the cross section of the circumferential back metal 26 is arranged so as to face outward in the radial direction when centered on the central axis of the shell 7 to be attached later. The circumferential back metal 26 has an outer peripheral shape corresponding to the inner diameter of the shell 7 to be attached later. The circumferential backing metal 26 is fixed to the pipe plates 20 and 21 by welding. The circumferential back metal 26 may be fixed to the pipe plates 20 and 21 by temporary fixing such as spot welding.

The shell 7 is attached to the skeleton structure composed of the backing metal 22, 24, 26 shown in FIG. The shell 7 is attached as a shell dividing body 7a, 7b, 7c, 7d (see FIG. 7A) which has a dividing line in the longitudinal direction and is divided into four parts. Specifically, the shell 7 is divided into four at 90 ° when viewed from the front of the tube plates 20 and 21. The number of divisions is not limited to four, and may be two or more divisions. Further, instead of dividing by 90 °, it may be divided into 30 ° and 60 ° without dividing at equal angles.

Next, the manufacturing process of the evaporator 4 using the structure shown in FIG. 4 will be described.
First, as shown in FIGS. 5A and 5B, each end of the partition plate 8 is inserted into each of the slits 20a and 21a formed in the tube plates 20 and 21. Each end of the partition plate 8 projects to the extent that a groove can be formed on the outside of the tube plates 20 and 21. Then, welding is performed from the outside of each of the tube plates 20 and 21, that is, from the end side of the partition plate 8 along the groove formed between the slits 20a and 21a and the partition plate 8. Welding is performed so that the four sides along the outer circumference of the partition plate 8 are completely penetration welded. As a result, the welding line W1 is formed on the outside of each of the tube plates 20 and 21.

Next, the backing metal 22, 24, 26 is attached to the assembly of the tube plates 20, 21 and the partition plate 8 assembled as shown in FIGS. 5A and 5B. The circumferential backing metal 26 is temporarily fixed to the pipe plates 20 and 21 by spot welding or the like. The vertical axis direction backing metal 22 is temporarily fixed to the partition plate 8 by spot welding or the like in a state where the longitudinal end portion is abutted against the circumferential direction backing metal 26. The left-right axial backing metal 24 is temporarily fixed to the circumferential backing metal 26 by spot welding or the like with its longitudinal end abutted against the circumferential backing metal 26.

Next, the shell 7 is attached to the skeleton structure of the tube plates 20 and 21 assembled as shown in FIGS. 6A and 6B, the partition plate 8 and the backing metal 22, 24, 26. Specifically, as the shell 7, four shell divided bodies 7a, 7b, 7c, and 7d divided into four in the circumferential direction are used. Each of the shell divided bodies 7a, 7b, 7c, and 7d is formed by being curved in a substantially 90 ° circumferential direction, and extends in the longitudinal direction (axial direction) over the length between the tube plates 20 and 21.

Each shell split body 7a, 7b, 7c, 7d has a groove in the circumferential direction of the shell 7 as a longitudinal abutment weld with the pipe plates 20 and 21 at both ends in the longitudinal direction (axial direction of the shell 7). Is formed, and the shell split bodies 7a, 7b, 7c, and 7d are welded from the outer peripheral side so as to be completely penetration welded. At the time of welding, the circumferential backing metal 26 is located on the inner peripheral side of the shell divided bodies 7a, 7b, 7c, and 7d. As a result, the shape of the shell 7 in the circumferential direction is determined to follow the shape of the circumferential back metal 26. The welding line W2 at this time is formed on the outer peripheral side of the shell 7 (see FIG. 7B).

Each shell split body 7a, 7b, 7c, 7d has a groove in the longitudinal direction of the shell 7 as a circumferential abutment weld with the partition plate 8 at the (one) end on the partition plate 8 side in the circumferential direction. Is formed, and the shell split bodies 7a, 7b, 7c, and 7d are welded from the outer peripheral side so as to be completely penetration welded. At the time of welding, the backing metal 22 in the vertical axis direction is located on the inner peripheral side of the shell divided bodies 7a, 7b, 7c, and 7d. The welding line W3 at this time is formed on the outer peripheral side of the shell 7.

Each shell split body 7a, 7b, 7c, 7d is a shell as a shell circumferential butt weld between the circumferential (other) ends of the shell split bodies 7a, 7b, 7c, 7d adjacent in the circumferential direction. A groove is formed over the longitudinal direction of the shell 7, and the shell split bodies 7a, 7b, 7c, and 7d are welded from the outer peripheral side so as to be completely penetration welded. At the time of welding, the backing metal 24 in the left-right axial direction is located on the inner peripheral side of the shell divided bodies 7a, 7b, 7c, and 7d. The welding line W4 at this time is formed on the outer peripheral side of the shell 7.

The shell divided bodies 7a, 7b, 7c, and 7d may be formed into a curved shape in advance before welding, or the end portion on the partition plate 8 side in the circumferential direction is welded to the partition plate 8. It may be curved after being fixed.

According to this embodiment, the following effects are exhibited.
When the longitudinal end of the shell 7 is abutted against the pipe plates 20 and 21 for abutt welding, a circumferential backing metal 26 is provided on the inner peripheral side of the shell 7. As a result, even if welding is performed from the outer peripheral side of the shell 7, contamination such as spatter generated during welding can be prevented from remaining inside the shell 7.

By matching the shape of the backing metal 26 in the circumferential direction with the inner diameter shape of the shell 7, the shape of the shell 7 can be accurately realized.

By using the circumferential backing metal 26, complete penetration welding becomes possible, and welding defects can be reduced.

When abutting welding is performed by abutting the circumferential end of the shell 7 against the partition plate 8, it is decided to provide a backing metal 22 in the vertical axial direction on the inner peripheral side of the shell 7. As a result, even if welding is performed from the outer peripheral side of the shell 7, contamination such as spatter generated during welding can be prevented from remaining inside the shell 7.

By using the backing metal 22 in the vertical axis direction, complete penetration welding becomes possible, and welding defects can be reduced.

When abutt welding is performed by abutting the circumferential end portions of one shell split body 7a, 7c with the circumferential end portions of the other shell split bodies 7b, 7d, the left and right axial directions are on the inner peripheral side of the shell 7. It was decided to provide a back allowance 24. As a result, even if welding is performed from the outer peripheral side of the shell 7, contamination such as spatter generated during welding can be prevented from remaining inside the shell 7.

By using the backing metal 24 in the left-right axial direction, complete penetration welding becomes possible, and welding defects can be reduced.

Since the shell 7 can be divided into a plurality of shell divided bodies 7a, 7b, 7c, and 7d in the circumferential direction, one unit of the shell divided bodies 7a, 7b, 7c, and 7d becomes smaller and easy to handle. This facilitates storage, transportation, and fixing of the shell divided bodies 7a, 7b, 7c, and 7d.

In the above embodiment, as shown in FIG. 5A, slits 20a and 21a are formed in the tube plates 20 and 21 so that the partition plate 8 is inserted. On the other hand, it can be transformed as follows.

As shown in FIG. 8A, a groove 20c having an opening at one end in the longitudinal direction may be formed, inserted into the groove 20c, and welded so as to form a welding line W1'from three directions. The opening of the groove mouth 20c may be upward or downward in the longitudinal direction as shown in FIG. 8A. This structure can also be applied to the other tube plate 21.

As shown in FIG. 8B, two pipe plates 20 may be used for welding so as to form a welding line W1 ”from two directions in a state where the two pipe plates 20 are attached to the partition plate 8 at the center. It can also be applied to the tube plate 21 of.

In the above-described embodiment, as shown in FIG. 5B, when the partition plate 8 is welded to the pipe plates 20 and 21, it is decided to weld only from the outside of the pipe plates 20 and 21. On the other hand, it can be transformed as follows.

As shown in FIG. 9A, welding may be performed so as to form the welding line W1 not only on the outside of the pipe plate 20 but also on the inside. This structure can also be applied to the other tube plate 21.

As shown in FIG. 9B, welding may be performed so as to form the welding line W1 only from the inside of the pipe plate 20. This structure can also be applied to the other tube plate 21.

The heat exchanger described in each of the above-described embodiments, the double-cycle refrigerator provided with the heat exchanger, and the method for manufacturing the heat exchanger are grasped as follows, for example.

The heat exchangers (3, 4) according to one aspect of the present disclosure are a double combination of a first refrigerating machine constituting a refrigerating cycle with a first refrigerant and a second refrigerating machine constituting a refrigerating cycle with a second refrigerant. The shell (7) used in the condensers (3a, 3b) and / or the evaporators (4a, 4b) of the cycle refrigerator to form a refrigerant space inside, and the refrigerant space in the shell (7) are described above. A partition plate (8) that separates the first refrigerant and the second refrigerant, and a heat exchange medium chamber that is provided at the ends of the shell (7) and the partition plate (8) and into which a heat exchange medium is introduced. (10, 11), a tube plate (20, 21) that partitions the refrigerant space in the heat exchange medium chamber (10, 11) and the shell (7) and supports a heat transfer tube through which the heat exchange medium flows, and the above. A first provided at the longitudinal abutting welded portion where the end portion of the shell (7) in the longitudinal direction is abutted against the tube plate (20, 21) and provided on the inner peripheral side of the shell (7). It has a back allowance (26).

It was decided to provide a first backing metal on the inner peripheral side of the shell when abutting welding is performed by abutting the longitudinal end of the shell against the pipe plate. As a result, even if welding is performed from the outer peripheral side of the shell, contamination such as spatter generated during welding can be prevented from remaining inside the shell.
Further, by matching the shape of the first backing metal with the inner diameter shape of the shell, the shell shape can be accurately realized.
Further, by using the first backing metal, complete penetration welding becomes possible, and welding defects can be reduced.

Further, according to the heat exchangers (3, 4) according to one aspect of the present disclosure, the peripheral abutting welding in which the end portion of the shell (7) in the circumferential direction is abutted against the partition plate (8). It is provided with a second backing metal (22) provided on the inner peripheral side of the shell (7).

It was decided to provide a second backing metal on the inner peripheral side of the shell when abutting welding is performed by abutting the peripheral end of the shell against the partition plate. As a result, even if welding is performed from the outer peripheral side of the shell, contamination such as spatter generated during welding can be prevented from remaining inside the shell.
Further, by using the second backing metal, complete penetration welding becomes possible, and welding defects can be reduced.

Further, according to the heat exchangers (3, 4) according to one aspect of the present disclosure, one end of the shell (7a, 7c) in the circumferential direction and the other shell (7b, 7d) in the circumferential direction. The third aspect of claim 1 or 2, which is provided in a shell circumferential abutment welded portion to which an end portion is abutted, and is provided with a third backing metal (24) provided on the inner peripheral side of the shell (7). Heat exchanger.

When abutment welding is performed by abutting the circumferential end of one shell with the circumferential end of another shell, a third backing metal is provided on the inner peripheral side of the shell. As a result, even if welding is performed from the outer peripheral side of the shell, contamination such as spatter generated during welding can be prevented from remaining inside the shell.
Further, by using the third backing metal, complete penetration welding becomes possible, and welding defects can be reduced.
Further, since the shell can be divided into a plurality of parts in the circumferential direction, one unit of the shell becomes smaller and it becomes easier to handle. This facilitates storage, transportation, and fixing of the shell.

Further, the double cycle refrigerator according to one aspect of the present disclosure includes the heat exchanger (3, 4) described in any of the above.

By using the above heat exchanger, a compact double cycle refrigerator can be provided.

Further, the method for manufacturing the heat exchangers (3, 4) according to one aspect of the present disclosure includes a first refrigerating machine that constitutes a refrigerating cycle using the first refrigerant and a second refrigerating machine that constitutes a refrigerating cycle using the second refrigerant. A shell (7) that is used in the condensers (3a, 3b) and / or evaporators (4a, 4b) of a double-cycle refrigerating machine that forms a refrigerant space inside, and inside the shell (7). A partition plate (8) that divides the refrigerant space of the above into the first refrigerant and the second refrigerant, and a heat exchange medium provided at the ends of the shell (7) and the partition plate (8) are introduced. A tube plate (20,) that partitions the heat exchange medium chamber (10, 11), the refrigerant space in the heat exchange medium chamber (10, 11), and the shell (7), and supports the heat transfer tube through which the heat exchange medium flows. 21), which is a method for manufacturing a heat exchanger (3, 4) provided with the above, wherein an end portion of the shell (7) in the longitudinal direction is abutted against the tube plate (20, 21). The first back metal (26) is fixed to the pipe plate (20, 21) at a position corresponding to the abutting welded portion, and the inner peripheral side of the end portion of the shell (7) in the longitudinal direction is the first. 1 After stacking on the back metal (26), the shell (7) and the tube plate (20, 21) are welded and fixed from the outer peripheral side of the shell (7).

3 Condenser (heat exchanger)
4 Evaporator (heat exchanger)
5,7 Shell 7a, 7b, 7c, 7d Shell split body 6,8 Partition plate 10,11 Water chamber (heat exchange medium chamber)
20, 21 Tube plate 20a, 21a Slit 22 Vertical axis direction backing metal (second backing metal)
24 Left and right axis direction backing (third backing)
26 Circumferential back allowance (1st back allowance)
W1, W1', W1', W2, W3, W4 Welding wire

Claims (5)

Used in the condenser and / or evaporator of a double-cycle refrigerator that combines a first refrigerator that constitutes a refrigeration cycle with a first refrigerant and a second refrigerator that constitutes a refrigeration cycle with a second refrigerant.
A shell that forms a refrigerant space inside,
A partition plate that divides the refrigerant space in the shell into the first refrigerant and the second refrigerant.
A heat exchange medium chamber provided at the end of the shell and the partition plate into which the heat exchange medium is introduced, and a heat exchange medium chamber.
A tube plate that separates the heat exchange medium chamber from the refrigerant space in the shell and supports a heat transfer tube through which the heat exchange medium flows.
A first backing metal provided at a longitudinal abutting weld where an end portion of the shell in the longitudinal direction is abutted against the tube plate and provided on the inner peripheral side of the shell.
A heat exchanger equipped with. Claim 1 is provided with a second backing metal provided at a circumferential abutting welded portion where an end portion of the shell in the circumferential direction is abutted against the partition plate and provided on the inner peripheral side of the shell. The heat exchanger described in. A third back provided at a shell circumferential abutting weld where one end of the shell in the circumferential direction and another end of the shell in the circumferential direction are abutted, and provided on the inner peripheral side of the shell. The heat exchanger according to claim 1 or 2, wherein the money is provided. A double cycle refrigerator comprising the heat exchanger according to any one of claims 1 to 3. Used in the condenser and / or evaporator of a double-cycle refrigerator that combines a first refrigerator that constitutes a refrigeration cycle with a first refrigerant and a second refrigerator that constitutes a refrigeration cycle with a second refrigerant.
A shell that forms a refrigerant space inside,
A partition plate that divides the refrigerant space in the shell into the first refrigerant and the second refrigerant.
A heat exchange medium chamber provided at the end of the shell and the partition plate into which the heat exchange medium is introduced, and a heat exchange medium chamber.
A tube plate that separates the heat exchange medium chamber from the refrigerant space in the shell and supports a heat transfer tube through which the heat exchange medium flows.
It is a manufacturing method of a heat exchanger equipped with
The first backing metal is fixed to the pipe plate at a position corresponding to the longitudinal abutting welded portion where the end portion in the longitudinal direction of the shell is abutted against the pipe plate, and the first back metal is fixed to the pipe plate in the longitudinal direction of the shell. A method for manufacturing a heat exchanger in which the shell and the tube plate are welded and fixed from the outer peripheral side of the shell after the inner peripheral side of the end portion is overlapped with the first backing metal.

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