JP5545198B2 - Plate heat exchanger - Google Patents

Description

  The present invention relates to a plate heat exchanger, and more particularly to a plate heat exchanger in which two types of fluid flow paths are alternately formed with a heat transfer plate as a boundary.

A plate heat exchanger composed of a plurality of heat transfer plates is employed in various devices such as a water heater and a water heater. In the plate heat exchanger, flow paths having different directions are alternately formed between adjacent heat transfer plates. Two types of fluid to be heat exchanged flow through each flow path.

Patent document 1 is disclosing the plate-type heat exchanger comprised from a 3 layer plate unit. This three-layer plate unit is composed of three heat transfer plates having the same shape joined and integrated into a single plate through a partial anti-bonding layer.

In this plate heat exchanger, each plate is not joined in a gas-liquid tight manner entirely by forming a joining prevention layer between the plates. Since the passage of the leaked fluid is reliably formed between the plates, the function of discharging the leaked fluid to the outside of the heat transfer plate is ensured. Even if a leak such as a crack occurs in the heat transfer plate that partitions the two adjacent fluid flow paths due to the leaked fluid discharge function, the leaked fluid is reliably discharged out of the heat transfer plate, Mixing of the two fluids is reliably avoided.

The leakage fluid discharge function is secured by a three-layer plate unit in which three heat transfer plates are joined and integrated into one plate. An enormous number of plates is required to establish a heat exchanger with the configuration of the three-layer plate unit. Since this method is costly, it is not suitable for downsizing the heat exchanger.

A plurality of uneven shapes are formed on the heat transfer plate. When three heat transfer plates having the same shape are joined and integrated into a single plate shape, it is difficult to uniformly adhere the heat transfer plates having a plurality of uneven shapes due to shape factors. When the heat transfer plates having the same shape having a plurality of uneven shapes are overlapped, the slope portions forming the plurality of uneven shapes are first brought into close contact with each other. In this state, the apexes of the plurality of concave and convex shapes are in a state where gaps are left open. If the three heat transfer plates cannot be brought into close contact with each other, heat exchange between the two types of fluids becomes insufficient, so that the heat transfer performance necessary as a heat exchanger cannot be ensured.

In order to make the three heat transfer plates adhere uniformly, the heat transfer plates of the same shape are not overlapped, but the three heat transfer plates formed in separate shapes so that the entire surface adheres uniformly by overlapping. It is conceivable that the plates are joined and integrated. In this method, it is necessary to process the three heat transfer plates with separate dies. If there are variations in the dimensions at the time of mold manufacture or plate processing, it is very difficult to make the plurality of uneven slopes and apexes uniformly adhere to the entire surface.

JP 2001-99487 A

  The present invention has been made in view of the above-described problems, and has improved the basic structure of the heat transfer plate, and has ensured a leakage fluid discharge function that reliably avoids mixing of two types of fluids, while reducing cost and size. It is an object of the present invention to provide a plate heat exchanger that can be converted into a plate.

The plate-type heat exchanger related to the present application is opposed to the first heat transfer plate, in which four pipe openings are opened and a plurality of convex portions are formed on the flat surface, and the first heat transfer plate, Four pipe ports are opened, the second heat transfer plate having a groove-like recess formed in the plane portion, and the second heat transfer plate facing the second heat transfer plate, the four pipe ports being opened, The part is provided with a third heat transfer plate having a plurality of protrusions, and four pipe ports are opened to face the third heat transfer plate, and a groove-like recess is formed in the flat part. And a fourth heat transfer plate. The laminated body formed by joining the first heat transfer plate, the second heat transfer plate, the third heat transfer plate, and the fourth heat transfer plate in this order over a plurality of stages has a discharge port penetrating in the stacking direction. Are provided, the first gap formed by the convex portion of the first heat transfer plate and the concave portion of the second heat transfer plate, and the convex portion of the third heat transfer plate and the fourth heat transfer plate. The 2nd clearance gap which a recessed part forms is connected with the discharge port.

  The configuration of the two-layer plate unit according to the present invention is effective in reducing the cost and size of the heat exchanger while ensuring a leakage fluid discharge function that reliably avoids mixing of two kinds of fluids.

It is a perspective view which shows the whole structure of a plate type heat exchanger. It is the perspective view which expanded and displayed a part of plate type heat exchanger. It is a disassembled perspective view for demonstrating the flow path formed in the plate type heat exchanger. It is a perspective view showing the structure of four types of heat-transfer plates. It is an expansion perspective view which shows the structure of a 1st plate unit. It is an expansion perspective view which shows the structure of a 2nd plate unit. It is a perspective view showing the cross section of a plate unit. It is a disassembled perspective view which shows the cross section of a laminated body. It is sectional drawing which shows the structure of a piping part. It is another sectional drawing which shows the structure of a piping part. It is a perspective view which shows the structure of a discharge port.

Embodiments of a plate heat exchanger according to the present invention will be described with reference to the drawings. FIG. 1 shows an overall perspective view of a plate heat exchanger according to the present embodiment. The plate heat exchanger 10 includes a laminated body 20, inlet pipes 110 and 112, and outlet pipes 111 and 113. The laminated body 20 is obtained by joining a plurality of heat transfer plates. The stack 20 is provided with two discharge ports 30 penetrating in the stacking direction from the upper end to the lower end. The inlet pipe 110 is connected to the pipe part 31 that is one corner of the four corners of the laminate 20. Similarly, the outlet pipe 111 is connected to the pipe part 32, the inlet pipe 112 is connected to the pipe part 33, and the outlet pipe 113 is connected to the pipe part 34.

FIG. 2 shows a partially enlarged view of the plate heat exchanger. The laminate 20 is composed of a plurality of laminated heat transfer plates. In the example of this figure, 28 heat transfer plates made of SUS plates are stacked. A large number of boss-like convex portions 115 and linear convex portions 116 are formed on the flat surface portion 130 of the heat transfer plate so as to cover the entire surface. The protrusions 115 are formed vertically and horizontally on the entire surface of the heat transfer plate, and the linear protrusions 116 are formed in a single character in the longitudinal direction of the heat transfer plate. The discharge port 30 communicates with the convex portion 116. When defects such as cracks occur in the heat transfer plate that partitions the two types of fluid flow paths and the fluid leaks, the leaked liquid flows out from the discharge port 30.

FIG. 3 shows an exploded perspective view of the plate heat exchanger. The fluid 108 flows in from the inlet pipe 110 and flows out from the outlet pipe 111. The fluid 109 flows in from the inlet pipe 112 and flows out from the outlet pipe 113. For example, liquefied carbon dioxide is used for the fluid 108 and water is used for the fluid 109. The stacked body 20 includes first plate units 106 and second plate units 107 that are alternately stacked over a plurality of stages. The first plate unit 106 and the second plate unit 107 are equal in number, and are integrated by using a sheet-like copper foil as a brazing material.

The first plate unit 106 is obtained by joining and integrating the heat transfer plate 102 and the heat transfer plate 103 into a single plate using a sheet-like copper foil as a brazing material. Usually, no fluid flows between the heat transfer plate 102 and the heat transfer plate 103. Similarly, the second plate unit 107 is formed by joining and integrating the heat transfer plate 104 and the heat transfer plate 105 into a single plate using a sheet-like copper foil as a brazing material. Usually, no fluid flows between the heat transfer plate 104 and the heat transfer plate 105.

Since there are many convex portions 115 between the first plate unit 106 and the second plate unit 107, a flow path is formed. In the example of this figure, when the upper stage is the first plate unit 106, the fluid 108 flows from the left side to the right side. When the upper stage is the second plate unit 107, the fluid 109 flows from the right side to the left side. Since the two types of fluid 108 and fluid 109 flow through the first plate unit 106 and the second plate unit 107 as a boundary, heat exchange is performed between the fluid 108 and the fluid 109.

In the heat transfer plate at the bottom of the laminate 20, small plates are attached at four locations in order to close the vacant four corner holes. In the plate heat exchanger 10, the inlet pipe 110 and the outlet pipe 111 are attached to the upper side (surface layer) of the laminated body 20, and the inlet pipe 112 and the outlet pipe 113 are attached to the lower side of the laminated body 20. Sometimes.

  FIG. 4 is an exploded perspective view for explaining the relationship between the heat transfer plate and the copper foil. The four types of heat transfer plates 102 to 105 are sequentially stacked in a plurality of stages according to this order. The heat transfer plate 102 and the heat transfer plate 104 are different in structure of the piping portions 31 to 34, but basically have the same shape. Although the heat transfer plate 103 and the heat transfer plate 105 have different structures of the piping portions 31 to 34, the basic shape is the same. The heat transfer plates 102 to 105 are obtained by molding a SUS plate by pressing or the like. A piping port is opened in the piping parts 31 to 34.

In the piping parts 31 to 34 of the heat transfer plates 102 to 105, the uneven shapes formed around the piping parts are different, and the two kinds of fluids 108 and 109 are not mixed (FIG. 9, 10). In the plate heat exchanger, the heat transfer plates 102 to 105, the copper foil 40, the inlet pipes 110 and 112, and the outlet pipes 111 and 113 are all assembled and then joined together in a product state. When joining and integrating, the copper foil 40 melts. When there are 28 heat transfer plates, 27 copper foils 40 are required. In the illustrated example, the copper foil 40 is provided with holes corresponding to the pipe portions 31 to 34, but this is not always necessary.

The detailed structure of the first plate unit 106 will be described with reference to FIG. On the flat surface portion 114 of the heat transfer plate 102, a boss-like convex portion 115 and a linear convex portion 116 are formed by press working or the like. A large number of recesses (grooves) 117 extending in the lateral (width) direction are formed in the flat portion 116 of the heat transfer plate 103 by pressing or the like. Since the pitch of the concave portions 117 is the same as the pitch of the convex portions 115, when the plates 102 and 103 are overlapped, the convex portions 115 overlap the concave portions 117. The drain port 30 is provided in each of the heat transfer plate 102 and the heat transfer plate 103.

The detailed structure of the second plate unit 107 will be described with reference to FIG. A boss-like convex portion 115 and a linear convex portion 116 are formed on the flat portion 114 of the heat transfer plate 104 by press working or the like. A large number of recesses (grooves) 117 extending in the lateral (width) direction are formed in the flat surface portion 116 of the heat transfer plate 105 by pressing or the like. Since the pitch of the concave portion 117 is the same as the pitch of the convex portion 115, the convex portion 115 overlaps the concave portion 117 when the heat transfer plate 104 and the heat transfer plate 105 are overlapped. The drain port 30 is provided in each of the heat transfer plate 104 and the heat transfer plate 105.

The function of the first plate unit 106 will be described with reference to FIG. When the heat transfer plate 102 and the heat transfer plate 103 are joined and integrated into a single plate using a copper foil, the flat portions 114 and the flat portions 116 serve as bonding surfaces and are in close contact with each other. The plurality of convex portions 115 and concave portions 117 formed on the heat transfer plate protrude to the opposite side when being joined and integrated into one plate shape, and a plurality of gaps 118 are formed in the plate unit 106. Form. Similarly, a plurality of gaps 118 are formed in the plate unit 107. The gap 118 functions as a flow path for collecting leaked fluid.

The flat part 114 and the flat part 116 serve as a heat transfer part that exchanges heat between the fluid 108 and the fluid 109. Since the flat surface portion 114 and the flat surface portion 116 are used as the bonding surfaces, the bonding surfaces are in close contact even when the heat transfer plate has a dimensional variation during mold manufacturing or plate processing. The uniform joint surface is effective for ensuring the heat transfer performance of the heat exchanger. Note that the convex portions 115 and the concave portions 117 crossing from end to end are not necessarily arranged in the vertical direction and the horizontal direction, and may be oblique directions as long as the plurality of gaps 118 are connected to the whole.

FIG. 8 shows an enlarged cross-sectional view of the laminate. In this figure, one second plate unit 107 is sandwiched between two first plate units 106. A channel through which the fluid 108 flows is formed between the upper first plate unit 106 and the middle second plate unit 107. Between the second plate unit 107 at the middle stage and the first plate unit 106 at the lower stage, a flow path through which the fluid 109 flows is formed. In this way, the flow paths through which the two types of fluids 108 and 109 to be heat exchanged are alternately formed.

The first plate unit 106 and the second plate unit 107 are joined and integrated at a plurality of locations by the apexes 120 of the plurality of convex portions 115 and the apexes 121 of the concave portions 117 formed on the heat transfer plate. By joining and integrating a plurality of locations, the laminated body can ensure pressure resistance against the fluid pressure applied to the plate units 106 and 107 by the fluid 108 and the fluid 109.

  The structure of the inlet of the plate heat exchanger 10 will be described with reference to FIG. The fluid 108 flows into the plate heat exchanger 10 from the inlet pipe 110 provided in the pipe portion 31 of the plate heat exchanger 10 and flows out from the outlet pipe 111. The structures of the piping part 31 of the inlet pipe 110 and the piping part 32 of the outlet pipe 111 are basically the same.

FIG. 10 is a cross-sectional view of the fluid 109. Due to the structure of the piping part 33 of the four types of heat transfer plates, the fluid 109 that flows in from the inlet pipe 112 flows out from the outlet pipe 113. The structures of the piping part 33 of the inlet pipe 112 and the piping part 34 of the outlet pipe 113 are basically the same. Due to the structure of the piping section, the two types of fluid 108 and fluid 109 are basically not mixed.

The heat transfer plates 102 to 105 are in contact with the fluid 108 and the fluid 109. As the plate heat exchanger is used for many years, the heat transfer plate may be corroded by the fluid 108 or 109 and the heat transfer plate may crack. In the plate heat exchanger 10 according to the present application, the fluid 108 and the fluid 109 leaking from the crack are discharged from the discharge port 30. This discharging action will be described with reference to FIG. As shown in FIG. 8, a plurality of gaps 118 are formed in the plate units 106 and 107. The gap 118 functions as a flow path for the leakage fluid 122. Leakage fluid 122 that has entered the gaps in the plate unit from cracks in the heat transfer plate corrodes the copper foil. When the copper foil is corroded, a fluid is formed in the copper foil, and finally the leakage fluid 122 flows out to the gap 118 closest to the cracked portion.

The plurality of convex portions 115 and 116 and the concave portion 117 formed on the heat transfer plate are one in the vertical direction and the horizontal direction so as to cross the flat portion 114 and the flat portion 116 of the heat transfer plate from end to end. Several are arranged. The plurality of gaps 118 are connected to each other as a path of the leaking fluid 122 as a whole gap 118 in which all the gaps cross vertically and horizontally.

The discharge port 30 communicates with the entire gap 118. As a result, even if a defect such as a crack occurs in the heat transfer plates 102 to 105 and the fluid leaks, the leaked fluid 122 enters the entire gap 118 formed in the first plate unit 106 and the second plate unit 107. Discharged. Since the leaked fluid is reliably discharged out of the heat exchanger from the discharge port 30 connected to the entire gap 118, mixing of the two types of fluid 108 and fluid 109 is avoided.

  DESCRIPTION OF SYMBOLS 10 Plate type heat exchanger, 102-105 Heat transfer plate, 106 1st plate unit, 107 2nd plate unit, 108 fluid, 109 fluid, 110 inlet piping, 111 outlet piping, 112 inlet piping, 113 Outlet piping

Claims (3)

A first heat transfer plate in which four piping ports are opened and a plurality of convex portions are formed on the plane portion;
Opposing to the first heat transfer plate, four pipe openings are opened, and a second heat transfer plate in which a groove-like recess is formed in the plane portion;
A third heat transfer plate that faces the second heat transfer plate, has four pipe openings, and has a plurality of convex portions formed on the flat surface portion;
The fourth heat transfer plate is opposed to the third heat transfer plate, has four pipe openings, and has a fourth heat transfer plate in which a groove-like recess is formed on the flat surface portion.
The laminated body formed by joining the first heat transfer plate, the second heat transfer plate, the third heat transfer plate, and the fourth heat transfer plate in this order over a plurality of stages has a discharge port penetrating in the stacking direction. Is provided,
The first gap formed by the convex portion of the first heat transfer plate and the concave portion of the second heat transfer plate, and the second gap formed by the convex portion of the third heat transfer plate and the concave portion of the fourth heat transfer plate. The plate-type heat exchanger is characterized in that the gap is in communication with the outlet. A first flow path is formed between the fourth heat transfer plate and the first heat transfer plate, and the first flow path is between the second heat transfer plate and the third heat transfer plate. The plate-type heat exchanger according to claim 1, wherein an independent second flow path is formed. The plate heat exchanger according to claim 2, wherein two outlet pipes and two inlet pipes are provided on the first heat transfer plate on the surface layer.

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