Shell and plate heat exchanger and refrigeration device

Abstract

A first surface (81) and a second surface (82) join to each other at a peripheral edge of a first flow path (33) and at a peripheral edge of a second flow path (34). A third surface (83) and a fourth surface (84) join to each other at peripheral edges of a second heat transfer plate (72) and a third heat transfer plate (73) and at a partition part (75) disposed between the first flow path (33) and the second flow path (34). The second surface (82) includes a rough surface.

Description

Shell and plate type heat exchanger and refrigeration equipment

[0001] The present disclosure relates to a shell-and-plate heat exchanger and a refrigeration system.

[0002] Patent Document 1 discloses a heat exchanger including a tank and a plate package disposed within the tank's interior space. The plate package includes a plurality of heat transfer plates (heat exchange plates) disposed adjacent to one another. The plurality of heat transfer plates form a refrigerant flow path (first space) through which a refrigerant flows and a heat medium flow path (second space) through which a heat medium flows. The plurality of heat transfer plates are joined by brazing, for example.

[0003] Special Publication No. 2006-527835

[0004] However, when multiple heat transfer plates are stacked and brazed together, the roughened heat transfer surfaces are covered with brazing material, which makes it difficult to improve the heat exchange efficiency of the refrigerant.

[0005] An object of the present disclosure is to increase the heat exchange efficiency of the refrigerant by roughening the heat transfer surface of the refrigerant flow path.

[0006] A first aspect of the present disclosure includes a shell (11) having an internal space (15), and a plate stack (30) accommodated in the internal space (15), the plate stack (30) having a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73) stacked in a plate thickness direction and joined to one another, the plate stack (30) including a refrigerant flow path (31) provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72) and through which a refrigerant flows, a heat medium flow path (32) provided between a third surface (83) of the second heat transfer plate (72) and a fourth surface (84) of the third heat transfer plate (73) and through which a heat medium flows, and a first flow path (33) extending in a stacking direction of the plate (72) and the third heat transfer plate (73) and communicating with the heat medium flow path (32), and a second flow path (34) extending in the stacking direction and communicating with the heat medium flow path (32), wherein the first surface (81) and the second surface (82) are joined to each other at a peripheral portion of the first flow path (33) and a peripheral portion of the second flow path (34), and the third surface (83) and the fourth surface (84) are joined to each other at a peripheral portion of the second heat transfer plate (72) and the third heat transfer plate (73) and at a partition portion (75) arranged between the first flow path (33) and the second flow path (34), and the second surface (82) has a rough surface.

[0007] In the first aspect, the first surface (81) and the second surface (82) are joined to each other at the peripheral portion of the first flow path (33) and the peripheral portion of the second flow path (34), so that the rough surface of the second surface (82) is exposed to the refrigerant flow path (31), thereby increasing the heat exchange efficiency of the refrigerant passing through the refrigerant flow path (31).

[0008] Furthermore, by joining the third surface (83) and the fourth surface (84) to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75), the heat medium is prevented from bypassing the partition portion (75) and flowing between the first flow path (33) and the second flow path (34), thereby making it possible to suppress a decrease in the heat exchange efficiency between the heat medium and the refrigerant.

[0009] A second aspect of the present disclosure is the shell-and-plate heat exchanger of the first aspect, wherein the roughened surface is provided over an area of ​​80% or more of the second surface (82).

[0010] In the second aspect, by providing a rough surface on 80% or more of the area of ​​the second surface (82), it is possible to increase the heat exchange efficiency of the refrigerant passing through the refrigerant flow path (31).

[0011] A third aspect of the present disclosure is a shell-and-plate heat exchanger according to the first or second aspect, wherein the first surface (81) and the second surface (82) are joined by brazing, and the third surface (83) and the fourth surface (84) are joined by brazing.

[0012] In the third embodiment, the first surface (81) and the second surface (82) are joined together by brazing, and the third surface (83) and the fourth surface (84) are joined together by brazing.

[0013] A fourth aspect of the present disclosure is the shell-and-plate heat exchanger of the third aspect, wherein a storage portion (95) for storing a brazing material (87) is provided between a brazing portion (85) at the periphery of the first flow path (33) where the first surface (81) and the second surface (82) are brazed and the refrigerant flow path (31).

[0014] In the fourth aspect, when brazing the first surface (81) and the second surface (82), the molten brazing material (87) is stored in the storage section (95), thereby preventing the brazing material (87) from entering the refrigerant flow path (31).

[0015] A fifth aspect of the present disclosure is the shell-and-plate heat exchanger of the fourth aspect, wherein the storage portion (95) is formed by recessing at least one of the first surface (81) and the second surface (82) at a position away from the refrigerant flow path (31).

[0016] In the fifth aspect, at least one of the first surface (81) and the second surface (82) is recessed at a position away from the refrigerant flow path (31), thereby forming the reservoir portion (95).

[0017] In a sixth aspect of the present disclosure, in the shell-and-plate heat exchanger of the fourth aspect, the storage section (95) is formed by recessing at least one of the first surface (81) and the second surface (82) in a stepped shape so as to open to the refrigerant flow path (31).

[0018] In the sixth aspect, the reservoir portion (95) can be formed by recessing at least one of the first surface (81) and the second surface (82) in a stepped shape so as to open to the refrigerant flow path (31).

[0019] A seventh aspect of the present disclosure is the shell-and-plate heat exchanger of any one of the fourth to sixth aspects, wherein the storage portion (95) extends around the entire circumferential direction of the first flow path (33).

[0020] In the seventh aspect, by extending the storage portion (95) around the entire circumference of the first flow path (33), it is possible to prevent the molten brazing material (87) from entering the refrigerant flow path (31).

[0021] An eighth aspect of the present disclosure is a shell-and-plate heat exchanger according to any one of the fourth to sixth aspects, wherein the storage sections (95) are provided in plurality at intervals in the circumferential direction of the first flow path (33).

[0022] In the eighth aspect, by providing multiple storage sections (95) at intervals around the circumferential direction of the first flow path (33), it is possible to prevent the molten brazing material (87) from entering the refrigerant flow path (31) while increasing the brazing area and ensuring the joining strength.

[0023] A ninth aspect of the present disclosure is a shell-and-plate heat exchanger according to any one of the fourth to eighth aspects, wherein the second surface (82) at the peripheral portion of the first flow path (33) does not have the rough surface.

[0024] In the ninth aspect, by configuring the second surface (82) at the peripheral portion of the first flow path (33) without a rough surface, the molten brazing material (87) can be prevented from flowing toward the refrigerant flow path (31) due to capillary action.

[0025] A tenth aspect of the present disclosure is the shell-and-plate heat exchanger of the first or second aspect, wherein the first surface (81) and the second surface (82) are joined by welding, and the third surface (83) and the fourth surface (84) are joined by brazing.

[0026] In the tenth aspect, the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by welding.

[0027] An eleventh aspect of the present disclosure is a shell-and-plate heat exchanger according to any one of the third to tenth aspects, wherein a first bulge (91) bulging from the first surface (81) toward the refrigerant flow path (31) is provided on a peripheral portion of the first heat transfer plate (71), and a second bulge (92) bulging from the second surface (82) toward the refrigerant flow path (31) and abutting against the first bulge (91) is provided on a peripheral portion of the second heat transfer plate (72).

[0028] In the eleventh aspect, when the third surface (83) and the fourth surface (84) are brazed together while pressing the second heat transfer plate (72) and the third heat transfer plate (73), the first bulge portion (91) and the second bulge portion (92) are brought into contact with each other, thereby preventing deformation of the second heat transfer plate (72) and the third heat transfer plate (73).

[0029] A twelfth aspect of the present disclosure is the shell-and-plate heat exchanger of the eleventh aspect, wherein the abutting surfaces of the first bulging portion (91) and the second bulging portion (92) are joined by brazing.

[0030] In the twelfth aspect, the contact surfaces of the first bulging portion (91) and the second bulging portion (92) are joined by brazing, thereby ensuring the joining strength.

[0031] A thirteenth aspect of the present disclosure is the shell-and-plate heat exchanger of the twelfth aspect, wherein a storage portion (95) for storing a brazing material (87) is provided between the refrigerant flow path (31) and a brazing portion (85) where the first bulge portion (91) and the second bulge portion (92) are brazed at the abutment surface.

[0032] In the thirteenth aspect, when brazing the contact surfaces of the first bulge portion (91) and the second bulge portion (92), the molten brazing material (87) is stored in the storage portion (95), thereby preventing the brazing material (87) from entering the refrigerant flow path (31).

[0033] A fourteenth aspect of the present disclosure is the shell-and-plate heat exchanger of the thirteenth aspect, wherein the storage portion (95) is formed by recessing the abutment surface of at least one of the first bulge portion (91) and the second bulge portion (92) at a position away from the refrigerant flow path (31).

[0034] In the fourteenth aspect, the storage section (95) can be formed by recessing the contact surface of at least one of the first bulge section (91) and the second bulge section (92) at a position away from the refrigerant flow path (31).

[0035] In a fifteenth aspect of the present disclosure, in the shell-and-plate heat exchanger of the thirteenth aspect, the storage portion (95) is formed by recessing the contact surface of at least one of the first bulge portion (91) and the second bulge portion (92) in a stepped manner so as to open to the refrigerant flow path (31).

[0036] In the fifteenth aspect, a storage section (95) can be formed by recessing the contact surface of at least one of the first bulge section (91) and the second bulge section (92) in a stepped shape so as to open to the refrigerant flow path (31).

[0037] A sixteenth aspect of the present disclosure is the shell-and-plate heat exchanger of the first or second aspect, wherein the first surface (81) and the second surface (82) are joined by welding, and the third surface (83) and the fourth surface (84) are joined by welding.

[0038] In the sixteenth aspect, the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by welding.

[0039] A seventeenth aspect of the present disclosure is the shell-and-plate heat exchanger of the sixteenth aspect, wherein peripheral portions of the third surface (83) and the fourth surface (84) are formed flat.

[0040] In the seventeenth aspect, by forming the peripheral portions of the third surface (83) and the fourth surface (84) flat, the second heat transfer plate (72) and the third heat transfer plate (73) can be welded together with the peripheral portions of the third surface (83) and the fourth surface (84) in close contact with each other.

[0041] An eighteenth aspect of the present disclosure is a refrigeration system including a shell-and-plate heat exchanger (10) according to any one of the first to seventeenth aspects, and a refrigerant circuit (1a) through which refrigerant that has undergone heat exchange in the shell-and-plate heat exchanger (10) flows.

[0042] In the eighteenth aspect, a refrigeration system can be provided, which includes a shell-and-plate heat exchanger (10) and a refrigerant circuit (1a).

[0043] FIG. 1 is a refrigerant circuit diagram showing the configuration of a refrigeration system according to the first embodiment. FIG. 2 is a side cross-sectional view showing the configuration of a shell-and-plate heat exchanger. FIG. 3 is a front cross-sectional view showing the configuration of a shell-and-plate heat exchanger. FIG. 4 is a side cross-sectional view showing the configuration of a plate stack. FIG. 5 is a front view showing the configuration of a heat transfer plate. FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5. FIG. 7 is a cross-sectional view taken along line B-B in FIG. 5. FIG. 8 is a view corresponding to FIG. 7 showing the configuration of a plate stack according to the second embodiment. FIG. 9 is a view taken along line C in FIG. 8. FIG. 10 is a view corresponding to FIG. 6 showing the configuration of a plate stack according to the third embodiment. FIG. 11 is a view corresponding to FIG. 7 showing the configuration of a plate stack. FIG. 12 is a view corresponding to FIG. 6 showing the configuration of a plate stack according to the fourth embodiment. FIG. 13 is a view corresponding to FIG. 7 showing the configuration of a plate stack. FIG. 14 is a front view showing the configuration of a heat transfer plate according to the fifth embodiment. FIG. 15 is a cross-sectional view taken along line D-D in FIG. 14. FIG. 16 is a cross-sectional view showing the state in which a sheet-shaped brazing material is sandwiched. Fig. 17 is a partially enlarged front view showing the configuration of a heat transfer plate according to the sixth embodiment. Fig. 18 is a partially enlarged front view showing the configuration of a heat transfer plate according to the seventh embodiment. Fig. 19 is a cross-sectional view taken along the line E-E in Fig. 18. Fig. 20 is a partially enlarged front view showing the configuration of a heat transfer plate according to the eighth embodiment. Fig. 21 is a cross-sectional view taken along the line F-F in Fig. 20. Fig. 22 is a view equivalent to Fig. 21 showing the configuration of a heat transfer plate according to the ninth embodiment.

[0044] First Embodiment As shown in FIG. 1 , a shell-and-plate heat exchanger (10) (hereinafter simply referred to as a “heat exchanger”) is provided in a refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) has a compressor (2), a radiator (3), a pressure reduction mechanism (4), and a heat exchanger (10) serving as an evaporator. The pressure reduction mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0045] The refrigeration system (1) is, for example, an air conditioner. The air conditioner may be a cooling-only unit, a heating-only unit, or an air conditioner that switches between cooling and heating. In this case, the air conditioner has a switching mechanism (e.g., a four-way switching valve) that switches the refrigerant circulation direction. The refrigeration system (1) may be a water heater, a chiller unit, a cooling device that cools the air inside a storage unit, or the like. The cooling device cools the air inside a refrigerator, a freezer, a container, or the like.

[0046] <Heat Exchanger> As shown in Figures 2 and 3, the heat exchanger (10) has a shell (11) and a plate stack (30). The shell (11) has an internal space (15). A refrigerant flows into the internal space (15) of the shell (11). The plate stack (30) is accommodated in the internal space (15) of the shell (11). The refrigerant exchanges heat with a heat medium circulating within the plate stack (30). In this way, the heat exchanger (10) functions as an evaporator by evaporating the refrigerant that flows into the internal space (15) of the shell (11).

[0047] The refrigerant used here is a single HFO refrigerant or a mixed refrigerant containing an HFO refrigerant as a component. Specific examples include R1233zd(E), R1234ze(E), and R513A. The heat transfer medium used may be, for example, water or brine.

[0048] <Shell> The shell (11) has a tubular body (12), support legs (13), and a closing member (14). The tubular body (12) is formed of a cylindrical member that extends horizontally and is open at both axial ends.

[0049] The support legs (13) are disposed on both axial ends of the cylindrical body (12). The support legs (13) have holes formed therein that correspond to the openings of the cylindrical body (12). The support legs (13) are attached to the cylindrical body (12) by, for example, welding.

[0050] The closing members (14) close the openings at both ends of the cylindrical body (12) and are fastened to the support legs (13) by, for example, fastening bolts.

[0051] The shell (11) defines an internal space (15) by means of a cylindrical body (12), support legs (13), and a closing member (14). The shell (11) is installed with its axial direction aligned horizontally. A liquid refrigerant is stored in the internal space (15). A plate stack (30) is housed in the internal space (15).

[0052] The shell (11) has a refrigerant inlet (21) and a refrigerant outlet (22). The refrigerant inlet (21) is provided at the bottom of the shell (11). The refrigerant is introduced into the internal space (15) through the refrigerant inlet (21). In the example shown in Figure 2, the refrigerant inlet (21) is provided at the center of the lower part of the shell (11) in the stacking direction of the plate stack (30).

[0053] The refrigerant outlet (22) is provided at an upper portion of the shell (11). The refrigerant evaporated in the internal space (15) is discharged from the refrigerant outlet (22) to the outside of the shell (11). The refrigerant inlet (21) and the refrigerant outlet (22) are connected to the refrigerant circuit (1a).

[0054] The shell 11 has a heat transfer medium inlet 23 and a heat transfer medium outlet 24. The heat transfer medium inlet 23 and the heat transfer medium outlet 24 are tubular members.

[0055] The heat medium inlet (23) penetrates one axial end of the shell (11). The heat medium inlet (23) is connected to a heat medium introduction passage (33) of the plate stack (30). The heat medium inlet (23) supplies the heat medium to the plate stack (30). Heat exchange occurs between the refrigerant that has flowed into the internal space (15) of the shell (11) and the heat medium that has flowed into a heat medium flow passage (32) of the plate stack (30) described below.

[0056] The heat medium outlet (24) penetrates one axial end of the shell (11) at a position higher than the heat medium inlet (23). The heat medium outlet (24) is connected to a heat medium discharge path (34) of the plate stack (30). The heat medium outlet (24) discharges the heat medium from the plate stack (30). Note that the heat medium inlet (23) may be configured to be located higher than the heat medium outlet (24).

[0057] A partition member (60) is disposed below the plate stack (30). The partition member (60) has a partition plate (61). The partition plate (61) separates the plate stack (30) from the refrigerant inlet (21). The partition plate (61) extends along the lower surface of the plate stack (30) in the stacking direction of the plate stack (30).

[0058] The partition plate (61) has a plurality of communication holes (65). The refrigerant flowing in through the refrigerant inlet (21) flows along the partition plate (61) in the stacking direction of the heat transfer plates (40), and is discharged through the plurality of communication holes (65) toward the plate stack (30).

[0059] A mesh member (50) is disposed above the plate stack (30) and below the refrigerant outlet (22). The mesh member (50) collects droplets contained in the refrigerant that has passed through the refrigerant flow path (31) and flowed out from the upper surface of the plate stack (30). The mesh member (50) is formed, for example, in the shape of a thick plate by stacking metal meshes. The refrigerant can pass through the mesh member (50) in the thickness direction. The mesh member (50) is supported by a support member (52) (see FIG. 3). The support member (52) is fixed to the inner surface of the shell (11).

[0060] <Plate Stack> The plate stack (30) has a plurality of heat transfer plates (40) stacked in the thickness direction and joined to one another. The plate stack (30) is accommodated in the internal space (15) of the shell (11) with the stacking direction of the heat transfer plates (40) horizontal. The length of the plate stack (30) in the width direction is, for example, 600 to 1500 mm.

[0061] As shown in Fig. 4, the heat transfer plate (40) includes a first plate (40a) and a second plate (40b). In the plate stack (30), the first plates (40a) and the second plates (40b) are stacked alternately. The second plates (40b) are the first plates (40a) turned upside down.

[0062] In the following description, the left side of each of the first plate (40a) and the second plate (40b) in FIG. 4 is referred to as the front side, and the right side of each of the first plate (40a) and the second plate (40b) in FIG. 4 is referred to as the back side.

[0063] <Heat Medium Inlet Path, Heat Medium Outlet Path> The first plate (40a) has an inlet protrusion (41a) and an outlet protrusion (43a). The inlet protrusion (41a) and the outlet protrusion (43a) are formed by bulging a part of the first plate (40a) toward the surface side.

[0064] The inlet protrusion (41 a) is formed in the lower part of the first plate (40 a). A first inlet hole (42 a) is formed in the center of the inlet protrusion (41 a). The first inlet hole (42 a) is a circular hole that penetrates the first plate (40 a) in the thickness direction.

[0065] The outlet protrusion (43a) is formed on the upper part of the first plate (40a). A first outlet hole (44a) is formed in the center of the outlet protrusion (43a). The first outlet hole (44a) is a circular hole that penetrates the first plate (40a) in the thickness direction.

[0066] The second plate (40b) has an inlet recess (41b) and an outlet recess (43b). The inlet recess (41b) and the outlet recess (43b) are formed by bulging a part of the second plate (40b) toward the rear surface side.

[0067] The inlet recess (41b) is formed in the lower part of the second plate (40b). A second inlet hole (42b) is formed in the center of the inlet recess (41b). The second inlet hole (42b) is a circular hole that penetrates the second plate (40b) in the thickness direction. The inlet recess (41b) is formed at a position corresponding to the inlet protrusion (41a) of the first plate (40a). The second inlet hole (42b) is formed at a position corresponding to the first inlet hole (42a) of the first plate (40a).

[0068] The outlet recess (43b) is formed in the upper part of the second plate (40b). A second outlet hole (44b) is formed in the center of the outlet recess (43b). The second outlet hole (44b) is a circular hole that penetrates the second plate (40b) in the thickness direction. The outlet recess (43b) is formed at a position corresponding to the outlet protrusion (43a) of the first plate (40a). The second outlet hole (44b) is formed at a position corresponding to the first outlet hole (44a) of the first plate (40a).

[0069] In the plate stack (30), the peripheral edge of the first plate (40a) and the peripheral edge of the second plate (40b) adjacent to the back surface of the first plate (40a) are joined together along the entire periphery.

[0070] In the plate stack (30), the first inlet hole (42a) of the first plate (40a) overlaps with the second inlet hole (42b) of the second plate (40b) adjacent to the front surface of the first plate (40a). The overlapping peripheral portions of the first inlet hole (42a) and the second inlet hole (42b) are joined together along the entire periphery. The first inlet hole (42a) and the second inlet hole (42b) communicate with a heat medium flow path (32) described below and introduce a heat medium into the heat medium flow path (32).

[0071] In the plate stack (30), the first outlet hole (44a) of the first plate (40a) overlaps with the second outlet hole (44b) of the second plate (40b) adjacent to the front surface of the first plate (40a). The overlapping peripheral portions of the first outlet hole (44a) and the second outlet hole (44b) are joined along the entire periphery. The first outlet hole (44a) and the second outlet hole (44b) communicate with a heat medium flow path (32) described below, and allow the heat medium to flow out of the heat medium flow path (32).

[0072] In the plate stack (30), the inlet protrusion (41a) and the first inlet hole (42a) of the first plate (40a) and the inlet recess (41b) and the second inlet hole (42b) of the second plate (40b) form a heat transfer medium introduction passage (33).

[0073] In the plate stack (30), the heat medium discharge passage (34) is formed by the outlet protrusion (43a) and the first outlet hole (44a) of the first plate (40a) and the outlet recess (43b) and the second outlet hole (44b) of the second plate (40b).

[0074] The heat medium introduction channel (33) is a passage extending in the stacking direction of the heat transfer plates (40) in the plate stack (30). The heat medium introduction channel (33) is a passage isolated from the internal space (15) of the shell (11) and connects all the heat medium flow channels (32) to the heat medium inlet (23).

[0075] The heat medium outlet channel (34) is a passage extending in the stacking direction of the heat transfer plates (40) in the plate stack (30). The heat medium outlet channel (34) is a passage isolated from the internal space (15) of the shell (11) and connects all the heat medium flow channels (32) to the heat medium outlets (24).

[0076] <Refrigerant Channels, Heat Medium Channels> The plate stack (30) has refrigerant channels (31) and heat medium channels (32). A plurality of the refrigerant channels (31) and a plurality of the heat medium channels (32) are formed with the heat transfer plates (40) interposed therebetween. The refrigerant channels (31) and the heat medium channels (32) are separated from each other by the heat transfer plates (40). The first plate (40a) and the second plate (40b) each have repeated elongated ridge-like projections and depressions.

[0077] The first plate (40a) is provided with first front-side convex portions (45a) and first back-side convex portions (47a) alternately and repeatedly. The first front-side convex portions (45a) bulge out toward the front side of the first plate (40a). The first back-side convex portions (47a) bulge out toward the back side of the first plate (40a).

[0078] The second plate (40b) is provided with second front-side protrusions (47b) and second rear-side protrusions (45b) alternately and repeatedly. The second front-side protrusions (47b) bulge out toward the front side of the second plate (40b). The second rear-side protrusions (45b) bulge out toward the rear side of the second plate (40b).

[0079] The refrigerant flow path (31) is a flow path sandwiched between the front surface of the first plate (40a) and the back surface of the second plate (40b). The refrigerant flow path (31) is a flow path through which the refrigerant flows, communicating with the internal space (15) of the shell (11). Specifically, the refrigerant flow path (31) includes a flow path formed between the front surface of the first back-side convex portion (47a) and the back surface of the second front-side convex portion (47b).

[0080] The heat medium flow path (32) is a flow path sandwiched between the back surface of the first plate (40a) and the front surface of the second plate (40b). The heat medium flow path (32) is a flow path through which the heat medium flows while being isolated from the internal space (15) of the shell (11). Specifically, the heat medium flow path (32) includes a flow path formed between the back surface of the first front-side convex portion (45a) and the front surface of the second back-side convex portion (45b).

[0081] <Flow of Heat Medium and Refrigerant> The flow of the heat medium and refrigerant in the heat exchanger (10) will be described. As shown in Fig. 4 , the heat medium flows from the heat medium inlet (23) into the heat medium introduction passage (33). The heat medium flowing through the heat medium introduction passage (33) flows through the heat medium flow passage (32) from the first inlet hole (42a) and the second inlet hole (42b) toward the first outlet hole (44a) and the second outlet hole (44b).

[0082] Specifically, the heat medium flowing through the heat medium introduction passage (33) flows into the heat medium flow path (32). The heat medium flows along the heat medium flow path (32) and then flows into the heat medium flow path (32) adjacent to the heat medium flow path (32) on the upper side of the heat medium flow path (32). In this manner, the heat medium flows upward while reaching both side ends of the heat transfer plate (40).

[0083] Next, the flow of the refrigerant will be described. The refrigerant that has passed through the pressure reducing mechanism (4) in the refrigerant circuit (1a) flows into the heat exchanger (10). The refrigerant passes through the refrigerant inlet (21) and flows into the internal space (15) of the shell (11).

[0084] In the internal space (15) of the shell (11), most of the plate stack (30) is immersed in liquid refrigerant, and the liquid refrigerant flows into the refrigerant flow paths (31) of the plate stack (30). The liquid refrigerant that has flowed into the refrigerant flow paths (31) comes into contact with the heat transfer plates (40) and absorbs heat from the heat medium flowing in the heat medium flow paths (32), thereby evaporating. The gas refrigerant generated in the refrigerant flow paths (31) flows upward, exits the refrigerant flow paths (31), and is blown upward from the top surface of the plate stack (30).

[0085] The gas refrigerant that has passed through the plate stack (30) passes through the mesh member (50). The mesh member (50) captures liquid refrigerant contained in the gas refrigerant. The gas refrigerant that has passed through the mesh member (50) flows out of the shell (11) through the refrigerant outlet (22).

[0086] <Joining Structure of Heat Transfer Plates> Incidentally, there is a demand for roughening the heat transfer surfaces of the refrigerant flow path (31) in order to improve the heat exchange efficiency of the refrigerant. However, when a plurality of heat transfer plates (40) are stacked on top of each other and brazed together, the roughened heat transfer surfaces are covered with brazing material, which poses a problem in that the heat exchange efficiency of the refrigerant cannot be improved.

[0087] Therefore, in this embodiment, even if a rough surface is provided on the heat transfer surface of the refrigerant flow path (31), the rough surface can be exposed to the refrigerant flow path (31).

[0088] 5 to 7, the plate stack (30) includes a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73). The first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) are stacked in the thickness direction and joined to one another.

[0089] In the example shown in Fig. 6, the third heat transfer plate (40) from the left is the first heat transfer plate (71), the second heat transfer plate (40) from the left is the second heat transfer plate (72), and the first heat transfer plate (40) from the left is the third heat transfer plate (73). Here, the first heat transfer plate (71) and the third heat transfer plate (73) are the first plate (40a) described above. The second heat transfer plate (72) is the second plate (40b) described above.

[0090] The plate stack (30) has a refrigerant flow path (31), a heat medium flow path (32), a heat medium inlet channel (33) as a first flow path, and a heat medium outlet channel (34) as a second flow path.

[0091] The refrigerant flow path (31) is provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72). In the example shown in FIG. 7 , the first surface (81) is the left surface of the first heat transfer plate (71) in FIG. 7 . The second surface (82) is the right surface of the second heat transfer plate (72). In the second heat transfer plate (72), the second surface (82) has a rougher surface than a third surface (83) described later. The first surface (81) and the second surface (82) have a rougher surface than a third surface (83) and a fourth surface (84) described later.

[0092] The roughened surfaces are formed, for example, by sandblasting the first surface (81) and the second surface (82). The roughened surfaces are provided on 80% or more of the areas of the first surface (81) and the second surface (82). Note that the roughened surfaces may be provided only on the first surface (81) or only on the second surface (82).

[0093] The heat medium flow path (32) is provided between the third surface (83) of the second heat transfer plate (72) and the fourth surface (84) of the third heat transfer plate (73). In the example shown in Fig. 7, the third surface (83) is the left surface of the second heat transfer plate (72). The fourth surface (84) is the right surface of the third heat transfer plate (73).

[0094] The heat medium inlet channel (33) extends in the stacking direction of the second heat transfer plate (72) and the third heat transfer plate (73) and communicates with the heat medium flow channel (32). The heat medium outlet channel (34) extends in the stacking direction of the second heat transfer plate (72) and the third heat transfer plate (73) and communicates with the heat medium flow channel (32).

[0095] A partition (75) is provided on the third surface (83) of the second heat transfer plate (72) and the fourth surface (84) of the third heat transfer plate (73). The partition (75) of the second heat transfer plate (72) bulges out toward the fourth surface (84) of the third heat transfer plate (73). The partition (75) of the third heat transfer plate (73) bulges out toward the third surface (83) of the second heat transfer plate (72).

[0096] The partition (75) is disposed between the heat medium introduction path (33) and the heat medium discharge path (34). The partition (75) extends across the space between the heat medium introduction path (33) and the heat medium discharge path (34). The width of the partition (75) is shorter than the width of the second heat transfer plate (72) and the third heat transfer plate (73). The heat medium that has flowed into the heat medium flow path (32) through the heat medium introduction path (33) branches off along the lower edge of the partition (75) to flow to both sides in the width direction. The heat medium then flows toward the heat medium discharge path (34) through gaps between the peripheral edges of the second heat transfer plate (72) and the third heat transfer plate (73) and both width ends of the partition (75).

[0097] As shown in Fig. 6 , the first surface (81) and the second surface (82) are joined to each other at the periphery of the heat medium introduction passage (33) and the periphery of the heat medium discharge passage (34). More specifically, the first surface (81) and the second surface (82) are joined to each other at the periphery of the first inlet hole (42a) and the second inlet hole (42b) that form the heat medium introduction passage (33) and the periphery of the first outlet hole (44a) and the second outlet hole (44b) that form the heat medium discharge passage (34). The first surface (81) and the second surface (82) are joined to each other by brazing. In Fig. 6 , the brazed portions (85) are represented by black rectangles.

[0098] As shown in Fig. 7 , the third surface (83) and the fourth surface (84) are joined to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75). The third surface (83) and the fourth surface (84) are joined by brazing. In Fig. 7 , the brazed portion (85) is represented by a black rectangle.

[0099] <Method for Manufacturing Plate Stack> A method for manufacturing the plate stack (30) will be described below. The first surface (81) of the first heat transfer plate (71) and the second surface (82) of the second heat transfer plate (72) are subjected to sandblasting to roughen the surfaces of the first surface (81) and the second surface (82). This forms a roughened surface on the first surface (81) and the second surface (82). The roughened surface is provided over 80% or more of the area of ​​the first surface (81) and the second surface (82).

[0100] The third surface (83) of the second heat transfer plate (72) and the fourth surface (84) of the third heat transfer plate (73) are overlapped in the plate thickness direction, and the peripheral portions and the partition portions (75) of the second heat transfer plate (72) and the third heat transfer plate (73) are brazed together. As a result, a heat medium flow path (32) is formed between the third surface (83) of the second heat transfer plate (72) and the fourth surface (84) of the third heat transfer plate (73).

[0101] The first surface (81) of the first heat transfer plate (71) and the second surface (82) of the second heat transfer plate (72) are overlapped in the plate thickness direction, and the peripheral portions of the heat medium inlet channel (33) and the heat medium outlet channel (34) are brazed together. In this way, a refrigerant flow path (31) is formed between the first surface (81) of the first heat transfer plate (71) and the second surface (82) of the second heat transfer plate (72).

[0102] Here, the portions other than the peripheral portions of the heat medium inlet path (33) and the heat medium outlet path (34) are not brazed, so that the rough surfaces of the first surface (81) and the second surface (82) can be prevented from being covered with brazing material.

[0103] -Effects of embodiment 1- According to this embodiment, the first surface (81) and the second surface (82) are joined to each other at the peripheral edge of the first flow path (33) and the peripheral edge of the second flow path (34), so that the rough surface of the second surface (82) is exposed to the refrigerant flow path (31), thereby increasing the heat exchange efficiency of the refrigerant passing through the refrigerant flow path (31).

[0104] Furthermore, by joining the third surface (83) and the fourth surface (84) to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75), the heat medium is prevented from bypassing the partition portion (75) and flowing between the first flow path (33) and the second flow path (34), thereby making it possible to suppress a decrease in the heat exchange efficiency between the heat medium and the refrigerant.

[0105] According to this embodiment, by providing a rough surface on 80% or more of the area of ​​the second surface (82), it is possible to increase the heat exchange efficiency of the refrigerant passing through the refrigerant flow path (31).

[0106] According to this embodiment, the first surface (81) and the second surface (82) are joined together by brazing, and the third surface (83) and the fourth surface (84) are joined together by brazing.

[0107] According to the present embodiment, a refrigeration system (1) can be provided that includes a shell-and-plate heat exchanger (10) and a refrigerant circuit (1a).

[0108] Second Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0109] 8 and 9, a first bulge (91) is provided on the peripheral edge of the first heat transfer plate (71). The first bulge (91) bulges out from the first surface (81) toward the refrigerant flow path (31).

[0110] A second bulge (92) is provided on the peripheral edge of the second heat transfer plate (72). The second bulge (92) bulges from the second surface (82) toward the refrigerant flow path (31) and comes into contact with the first bulge (91).

[0111] The third surface (83) and the fourth surface (84) are joined to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75). The third surface (83) and the fourth surface (84) are joined to each other by brazing.

[0112] Here, when brazing the second heat transfer plate (72) and the third heat transfer plate (73), as shown in FIG. 9 , it is necessary to stack the first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) in the plate thickness direction, and then press the first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) from both ends in the plate thickness direction.

[0113] In the present embodiment, when the first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) are stacked in the plate thickness direction, the first bulging portion (91) and the second bulging portion (92) come into contact with each other. Therefore, during the brazing operation, the first bulging portion (91) and the second bulging portion (92) function as spacers, thereby preventing the peripheral edge portions of the second heat transfer plate (72) and the third heat transfer plate (73) from deforming in directions away from each other. This allows the peripheral edge portions of the second heat transfer plate (72) and the third heat transfer plate (73) to be appropriately brazed.

[0114] -Effects of Embodiment 2- According to the present embodiment, when the third surface (83) and the fourth surface (84) are brazed together while pressing the second heat transfer plate (72) and the third heat transfer plate (73), the first bulge portion (91) and the second bulge portion (92) are brought into contact with each other, thereby making it possible to prevent deformation of the second heat transfer plate (72) and the third heat transfer plate (73).

[0115] Third Embodiment As shown in Fig. 10 and Fig. 11 , the first surface (81) and the second surface (82) are joined to each other at the periphery of the heat medium inlet channel (33) and the periphery of the heat medium outlet channel (34). The first surface (81) and the second surface (82) are joined by welding. The first surface (81) and the second surface (82) are welded together by, for example, laser welding. In Fig. 10 , the welded portion (86) is represented by a filled-in circle.

[0116] As shown in Fig. 11 , the third surface (83) and the fourth surface (84) are joined to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75). The third surface (83) and the fourth surface (84) are joined by brazing. In Fig. 11 , the brazed portion (85) is represented by a black rectangle.

[0117] Effect of Third Embodiment According to the present embodiment, the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by welding.

[0118] Fourth Embodiment As shown in Fig. 12 and Fig. 13 , the first surface (81) and the second surface (82) are joined to each other at the periphery of the heat medium inlet channel (33) and the periphery of the heat medium outlet channel (34). The first surface (81) and the second surface (82) are joined by welding. The first surface (81) and the second surface (82) are welded together by, for example, laser welding. In Fig. 12 , the welded portion (86) is represented by a filled-in circle.

[0119] As shown in Fig. 13 , the third surface (83) and the fourth surface (84) are joined to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partition portion (75). The peripheral portions of the third surface (83) and the fourth surface (84) are formed flat. The third surface (83) and the fourth surface (84) are joined by welding. The welding of the third surface (83) and the fourth surface (84) is performed by, for example, laser welding. In Fig. 13 , the welded portion (86) is represented by a filled-in circle.

[0120] Effect of Fourth Embodiment According to this embodiment, the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by welding.

[0121] According to this embodiment, by forming the peripheral portions of the third surface (83) and the fourth surface (84) flat, the second heat transfer plate (72) and the third heat transfer plate (73) can be welded together with the peripheral portions of the third surface (83) and the fourth surface (84) in close contact with each other.

[0122] 14 and 15 , the plate stack (30) includes a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73). The first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) are stacked in the thickness direction and joined to one another.

[0123] In the example shown in Figure 15, the first heat transfer plate (40) from the top in Figure 15 is the first heat transfer plate (71), the second heat transfer plate (40) from the top is the second heat transfer plate (72), and the third heat transfer plate (40) from the top is the third heat transfer plate (73).

[0124] The plate stack (30) has a refrigerant flow path (31), a heat medium flow path (32), a heat medium inlet path (33) as a first flow path, and a heat medium outlet path (34) as a second flow path. The refrigerant flow path (31) is provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72). The heat medium flow path (32) is provided between a third surface (83) of the second heat transfer plate (72) and a fourth surface (84) of the third heat transfer plate (73).

[0125] The first surface (81) and the second surface (82) are joined to each other at the periphery of the heat medium inlet channel (33) and the periphery of the heat medium outlet channel (34). The first surface (81) and the second surface (82) are joined by brazing. In Fig. 15, the brazed portion (85) is represented by a black rectangle.

[0126] A reservoir (95) is provided between the refrigerant flow path (31) and a brazed portion (85) at the periphery of the heat medium introduction path (33) where the first surface (81) and the second surface (82) are brazed together. The reservoir (95) stores a brazing material (87).

[0127] The reservoir portion (95) is formed by recessing at least one of the first surface (81) and the second surface (82) at a position away from the refrigerant flow path (31). In the example shown in Fig. 15, the reservoir portion (95) is formed by recessing both the first surface (81) and the second surface (82). The reservoir portion (95) extends along the entire circumferential direction of the heat medium introduction path (33) (see Fig. 14).

[0128] In the example shown in Figure 15, the height of the refrigerant flow path (31) is, for example, 1.0 mm to 2.0 mm. The size of the reservoir (95) is smaller than the refrigerant flow path (31). For example, the height of the reservoir (95) may be set to half or less of the height of the refrigerant flow path (31). Specifically, when the height of the refrigerant flow path (31) is 1.0 mm, the height of the reservoir (95) may be set to 0.5 mm or less.

[0129] When brazing the first surface (81) and the second surface (82) at the periphery of the heat medium introduction passage (33), the first surface (81) of the first heat transfer plate (71) and the second surface (82) of the second heat transfer plate (72) are overlapped in the plate thickness direction, and a sheet-like brazing material (87) is sandwiched between them (see FIG. 16 ). The outer peripheral end of the brazing material (87) is disposed within the reservoir portion (95).

[0130] When the first surface (81) and the second surface (82) are brazed together in this state, the molten brazing material (87) is stored in the storage portion (95) (see FIG. 15 ). This prevents the molten brazing material (87) from entering the refrigerant flow path (31). The second surface (82) has a rough surface, which is exposed to the refrigerant flow path (31). If the molten brazing material (87) enters the refrigerant flow path (31), the brazing material (87) will cover the rough surface, which may hinder the improvement of heat exchange efficiency due to the rough surface. The provision of the storage portion (95) can further improve the heat exchange efficiency due to the rough surface exposed to the refrigerant flow path (31). Similarly, when the first surface (81) and the second surface (82) have rough surfaces, the heat exchange efficiency can be further improved.

[0131] Preferably, the first surface (81) and the second surface (82) at the periphery of the heat medium introduction path (33) are not roughened. Specifically, when forming the roughened surfaces, sandblasting is not performed on the first surface (81) and the second surface (82) at the periphery of the heat medium introduction path (33). The roughened surface may be formed only on the second surface (82).

[0132] In the example shown in FIG. 15 , the configuration in which the storage portion (95) is provided between the first surface (81) and the second surface (82) at the periphery of the heat medium introduction path (33) has been described. However, similarly, the storage portion (95) may be provided in the heat medium discharge path (34) between the first surface (81) and the second surface (82) at the periphery of the heat medium discharge path (34).

[0133] -Effects of embodiment 5- According to this embodiment, when brazing the first surface (81) and the second surface (82), the molten brazing material (87) is stored in the storage portion (95), thereby preventing the brazing material (87) from entering the refrigerant flow path (31).

[0134] According to this embodiment, at least one of the first surface (81) and the second surface (82) is recessed at a position away from the refrigerant flow path (31), thereby forming the reservoir portion (95).

[0135] According to this embodiment, by extending the storage section (95) around the entire circumference of the first flow path (33), it is possible to prevent the molten brazing material (87) from entering the refrigerant flow path (31).

[0136] According to this embodiment, by not providing a rough surface on the second surface (82) at the peripheral portion of the first flow path (33), the molten brazing material (87) can be prevented from flowing toward the refrigerant flow path (31) due to capillary action.

[0137] Sixth Embodiment Hereinafter, the same parts as those in the fifth embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0138] As shown in Fig. 17 , a plurality of storage portions (95) are provided at intervals in the circumferential direction of the first flow path (33). In the example shown in Fig. 17 , eight storage portions (95) extending along the circumferential direction of the heat medium introduction path (33) are provided at intervals in the circumferential direction. Between the storage portions (95) adjacent to each other in the circumferential direction, the first surface (81) and the second surface (82) are joined by brazing.

[0139] -Effects of embodiment 6- According to this embodiment, by providing a plurality of storage sections (95) at intervals in the circumferential direction of the first flow path (33), it is possible to prevent the molten brazing material (87) from entering the refrigerant flow path (31) while increasing the brazing area and ensuring the joining strength.

[0140] 18 and 19 , a first surface (81) of a first heat transfer plate (71) and a second surface (82) of a second heat transfer plate (72) are joined to each other at the periphery of the heat medium introduction passage (33). The first surface (81) and the second surface (82) are joined to each other by brazing.

[0141] A reservoir (95) is provided between the refrigerant flow path (31) and a brazed portion (85) at the periphery of the heat medium introduction path (33) where the first surface (81) and the second surface (82) are brazed together. The reservoir (95) stores a brazing material (87).

[0142] The reservoir portion (95) is formed by recessing at least one of the first surface (81) and the second surface (82) in a stepped shape so as to open to the refrigerant flow path (31). In the example shown in Fig. 19, the reservoir portion (95) is formed by recessing both the first surface (81) and the second surface (82) in a stepped shape.

[0143] The reservoir (95) extends along the entire circumferential direction of the heat medium introduction path (33) (see FIG. 18 ). Note that a plurality of reservoirs (95) may be provided at intervals in the circumferential direction of the first flow path (33).

[0144] When the first surface (81) and the second surface (82) are brazed together, the molten brazing material (87) is stored in the storage portion (95) (see FIG. 19 ), which makes it possible to prevent the molten brazing material (87) from entering the refrigerant flow path (31).

[0145] In the example shown in Figure 19, the height of the refrigerant flow path (31) is, for example, 1.0 mm to 2.0 mm. The size of the reservoir (95) is smaller than the refrigerant flow path (31). For example, the height of the reservoir (95) may be set to half or less the height of the refrigerant flow path (31). Specifically, when the height of the refrigerant flow path (31) is 1.0 mm, the height of the reservoir (95) may be set to 0.5 mm or less.

[0146] -Effects of embodiment 7- According to this embodiment, at least one of the first surface (81) and the second surface (82) is recessed in a stepped shape so as to open to the refrigerant flow path (31), thereby forming a storage section (95).

[0147] 20 and 21 , the plate stack (30) includes a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73). The first heat transfer plate (71), the second heat transfer plate (72), and the third heat transfer plate (73) are stacked in the thickness direction and joined to one another.

[0148] In the example shown in Figure 21, the third heat transfer plate (40) from the top in Figure 21 is the first heat transfer plate (71), the second heat transfer plate (40) from the top is the second heat transfer plate (72), and the first heat transfer plate (40) from the top is the third heat transfer plate (73).

[0149] As shown in Fig. 21, a first bulge (91) is provided on the peripheral edge of the first heat transfer plate (71). The first bulge (91) bulges out from the first surface (81) toward the refrigerant flow path (31).

[0150] A second bulge (92) is provided on the peripheral edge of the second heat transfer plate (72). The second bulge (92) bulges out from the second surface (82) toward the refrigerant flow path (31).

[0151] The first bulge (91) of the first heat transfer plate (71) abuts against the second bulge (92) of the second heat transfer plate (72). The abutting surfaces of the first bulge (91) and the second bulge (92) are joined by brazing.

[0152] A reservoir (95) is provided between the refrigerant flow path (31) and a brazing portion (85) at which the first bulge (91) and the second bulge (92) are brazed to each other at their contact surfaces. The reservoir (95) stores the brazing material (87).

[0153] The reservoir (95) is formed by recessing a contact surface of at least one of the first bulge (91) and the second bulge (92) in a stepped shape so as to open to the refrigerant flow path (31). In the example shown in Fig. 21 , the contact surfaces of both the first bulge (91) and the second bulge (92) are recessed in a stepped shape to form the reservoir (95).

[0154] Effect of the Eighth Embodiment According to the eighth embodiment, the first bulge (91) and the second bulge (92) are joined together by brazing, thereby ensuring sufficient joining strength.

[0155] According to this embodiment, when brazing the first bulge portion (91) and the second bulge portion (92), the molten brazing material (87) is stored in the storage portion (95), thereby preventing the brazing material (87) from entering the refrigerant flow path (31).

[0156] According to this embodiment, the storage section (95) can be formed by recessing the contact surface of at least one of the first bulge section (91) and the second bulge section (92) in a stepped shape so as to open to the refrigerant flow path (31).

[0157] 22 , the first bulge (91) of the first heat transfer plate (71) abuts against the second bulge (92) of the second heat transfer plate (72). The abutting surfaces of the first bulge (91) and the second bulge (92) are joined by brazing.

[0158] A reservoir (95) is provided between the refrigerant flow path (31) and a brazing portion (85) at which the first bulge (91) and the second bulge (92) are brazed to each other at their contact surfaces. The reservoir (95) stores the brazing material (87).

[0159] The reservoir portion (95) is formed by recessing the contact surface of at least one of the first bulge portion (91) and the second bulge portion (92) at a position away from the refrigerant flow path (31). In the example shown in Fig. 22, the contact surfaces of both the first bulge portion (91) and the second bulge portion (92) are recessed to form the reservoir portion (95).

[0160] -Effects of embodiment 9- According to this embodiment, a storage section (95) can be formed by recessing the contact surface of at least one of the first bulge section (91) and the second bulge section (92) at a position away from the refrigerant flow path (31).

[0161] Other Embodiments Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate. Furthermore, the terms "first," "second," "third," etc. in the specification and claims are used to distinguish between terms to which these terms are attached, and do not limit the number or order of those terms.

[0162] As described above, the present disclosure is useful for a shell-and-plate heat exchanger and a refrigeration device.

[0163] REFRIGERATION DEVICE 1a REFRIGERATOR CIRCUIT 10 PLATE-AND-SHELL HEAT EXCHANGER 11 SHELL 15 INTERNAL SPACE 30 PLATE LAYER 31 REFRIGERATOR FLOWER CHANNEL 32 HEAT TRANSFER CHANNEL 33 HEAT TRANSFER INTRODUCTION CHANNEL (FIRST CHANNEL) 34 HEAT TRANSFER OUTPUT CHANNEL (SECOND CHANNEL) 71 FIRST HEAT TRANSFER PLATE 72 SECOND HEAT TRANSFER PLATE 73 THIRD HEAT TRANSFER PLATE 75 PARTITION 81 FIRST SURFACE 82 SECOND SURFACE 83 THIRD SURFACE 84 FOURTH SURFACE 87 BRAZING MATERIAL 91 FIRST BULGE PORTION 92 SECOND BULGE PORTION 95 STORAGE PORTION

Claims

1. A heat transfer device comprising: a shell (11) having an internal space (15); and a plate stack (30) accommodated in the internal space (15), the plate stack (30) having a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73) stacked in a thickness direction and joined to one another, wherein the plate stack (30) comprises: a refrigerant flow path (31) provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72), through which a refrigerant flows; a heat medium flow path (32) provided between a third surface (83) of the second heat transfer plate (72) and a fourth surface (84) of the third heat transfer plate (73), through which a heat medium flows; a first flow path (33) extending in a stacking direction of the second heat transfer plate (72) and the third heat transfer plate (73), and communicating with the heat medium flow path (32); a second flow path (34) extending in the stacking direction and communicating with the heat medium flow path (32), wherein the first surface (81) and the second surface (82) are joined to each other at a peripheral portion of the first flow path (33) and a peripheral portion of the second flow path (34), and the third surface (83) and the fourth surface (84) are joined to each other at a peripheral portion of the second heat transfer plate (72) and the third heat transfer plate (73), and at a partition portion (75) arranged between the first flow path (33) and the second flow path (34), and the second surface (82) has a rough surface.

2. A shell and plate heat exchanger according to claim 1, wherein the roughened surface is provided over 80% or more of the area of ​​the second surface (82).

3. A shell and plate heat exchanger according to claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined by brazing, and the third surface (83) and the fourth surface (84) are joined by brazing.

4. A shell-and-plate heat exchanger according to claim 3, wherein a reservoir (95) for storing brazing material (87) is provided between the refrigerant flow path (31) and a brazing portion (85) at the periphery of the first flow path (33) where the first surface (81) and the second surface (82) are brazed.

5. A shell-and-plate heat exchanger according to claim 4, wherein the reservoir portion (95) is formed by recessing at least one of the first surface (81) and the second surface (82) at a position away from the refrigerant flow path (31).

6. A shell-and-plate heat exchanger according to claim 4, wherein the reservoir portion (95) is formed by recessing at least one of the first surface (81) and the second surface (82) in a stepped shape so as to open to the refrigerant flow path (31).

7. A shell and plate type heat exchanger according to any one of claims 4 to 6, wherein the reservoir (95) extends over the entire circumferential direction of the first flow path (33).

8. A shell and plate type heat exchanger according to any one of claims 4 to 6, wherein the reservoirs (95) are provided in plurality at intervals in the circumferential direction of the first flow path (33).

9. A shell and plate type heat exchanger according to any one of claims 4 to 8, wherein the second surface (82) at the peripheral edge of the first flow path (33) is not provided with the rough surface.

10. A shell and plate heat exchanger according to claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined by welding, and the third surface (83) and the fourth surface (84) are joined by brazing.

11. A shell-and-plate heat exchanger according to any one of claims 3 to 10, wherein the first heat transfer plate (71) is provided at its peripheral edge with a first bulge (91) bulging from the first surface (81) toward the refrigerant flow path (31), and the second heat transfer plate (72) is provided at its peripheral edge with a second bulge (92) bulging from the second surface (82) toward the refrigerant flow path (31) and coming into contact with the first bulge (91).

12. A shell and plate type heat exchanger according to claim 11, wherein the contact surfaces of the first bulging portion (91) and the second bulging portion (92) are joined by brazing.

13. A shell and plate type heat exchanger according to claim 12, wherein a storage section (95) for storing brazing material (87) is provided between the refrigerant flow path (31) and a brazing section (85) where the first bulge section (91) and the second bulge section (92) are brazed on the abutment surface.

14. A shell and plate type heat exchanger according to claim 13, wherein the storage portion (95) is formed by recessing the contact surface of at least one of the first bulge portion (91) and the second bulge portion (92) at a position away from the refrigerant flow path (31).

15. A shell-and-plate heat exchanger according to claim 13, wherein the storage portion (95) is formed by recessing the contact surface of at least one of the first bulging portion (91) and the second bulging portion (92) in a stepped manner so as to open onto the refrigerant flow path (31).

16. A shell and plate heat exchanger according to claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined by welding, and the third surface (83) and the fourth surface (84) are joined by welding.

17. A shell and plate heat exchanger according to claim 16, wherein the peripheral edges of the third surface (83) and the fourth surface (84) are formed flat.

18. A refrigeration system comprising: a shell-and-plate heat exchanger (10) according to any one of claims 1 to 17; and a refrigerant circuit (1a) through which refrigerant that has undergone heat exchange in the shell-and-plate heat exchanger (10) flows.

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