JP2555249Y2 - Plate heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger in which a plurality of heat transfer plates are stacked, and more particularly, to heating a secondary heat medium flowing through a flow path formed between the heat transfer plates. Or a plate-type heat exchanger capable of performing uniform cooling.

[0002]

2. Description of the Related Art As shown in FIG. 2, a plate-type heat exchanger for heating a low-temperature secondary heat medium with a high-temperature primary heat medium comprises a plurality of heat transfer plates (1) and a gasket (2). And are integrally fastened together. Hereinafter, the structure of the plate heat exchanger will be described.

As shown in FIG. 4, the heat transfer plate (1) is a vertically long and substantially rectangular heat transfer plate, and has passage holes (3), (4), (5), and (4) at four corners serving as entrances and exits of a heat medium. 6). The gasket (2) is mounted around the heat transfer surface on one side of the heat transfer plate (1). The gasket (2) covers the entire circumference of the heat transfer plate (1) and two passage holes (4) on the upper and lower sides. (6) a first gasket portion (2a) surrounding the frame, and a second gasket portion (2a) surrounding each of the remaining two passage holes (3) and (5).
b).

As described above, a plurality of heat transfer plates (1) each having a gasket mounted on one side are laminated as shown in FIG. 2. At this time, the heat transfer plates (1) are placed on a plane. The heat transfer plate (1 ′) is rotated by 180 °, and the heat transfer plate (1 ′) is laminated and integrated with the heat transfer plate (1). As a result, the primary heat medium is supplied by the cooperation of the passage holes (3) (6)... And the gasket (2) above the stacked heat transfer plates (1) (1 ′). A passage (7) is formed, and a secondary liquid collecting passage (8) is formed by cooperation of the passage holes (4) (5)... And the gasket (2). Similarly, in the lower part of the stacked heat transfer plates (1) (1 ′)..., The secondary medium supply passage is formed by cooperation of the passage holes (3) (6). (12) is formed, and further, by the cooperation of the passage holes (4), (5)... And the gasket (2),
The next liquid collection passage (11) is configured. The primary heat medium flowing through the primary heat medium supply passage (7) passes through the passage hole (3) and is branched and flows on the gasket mounting surface of the heat transfer plate (1 ′). It is collected in 4) and flows into the primary liquid collecting passage (11). However, since the primary heat medium is surrounded by the gasket (2), it cannot flow on the gasket mounting surface of the heat transfer plate (1) after passing through the passage hole (6). On the other hand, the secondary heat medium flowing through the secondary heat medium supply passage (12) flows on the gasket mounting surface of the heat transfer plate (1) and flows into the secondary liquid collecting passage (8) by the same configuration. However, it cannot flow on the gasket mounting surface of the heat transfer plate (1 '). Therefore, with such a configuration, the primary heat medium flow path (9) and the secondary heat medium flow path (10) are alternately formed between the heat transfer plates (1) and (1 '). The primary heat medium flowing through the primary heat medium flow path (9) and the secondary heat medium flowing through the secondary heat medium flow path (10) are connected to the heat transfer plate (1) or
Heat exchange is performed via (1 ').

[0005] Actually, the heat transfer plate (1) having the above structure is used.
A large number of (1 ′) are laminated, and for example, hot water is used as a primary heat medium, and food fluid is used as a secondary heat medium to heat sterilize food fluid.

[0006]

FIG. 5 schematically shows the plate-type heat exchanger having the above structure. In FIG. 5, a solid line portion is a primary heat medium, for example,
A flow path of hot water is shown, and a broken line portion shows a flow path of a secondary heat medium, for example, a food fluid. Moreover, 10a · · · · 10d represents a secondary heat medium passage _{(10), a 1 ···· a} 4 is secondary heat medium passage (10)
2 shows a passage hole (6) for supplying a secondary heat medium. Similarly,
9a · · · · 9d shows primary heat medium flow path _{(9), b 1 ···· b} 4
Denotes passage holes (3) and (3) for supplying the primary heat medium to the primary heat medium flow path (9). Further, T ₁ · · · · T ₄ shows the temperature of the secondary heat medium after the heat exchange termination.

In the conventional apparatus, since the opening diameters of the passage holes b ₁ ... B ₄ are the same, the flow rate of the primary heat medium flowing through 9 a. Similarly, since the opening diameters of a ₁ ... A ₄ are the same, the flow rates of the secondary heat medium flowing through 10 a. And the primary heat medium flowing through 9a is
The secondary heat medium flowing through 10c and 10d is heated. Similarly, the primary heat medium flowing through 9b is used as the secondary heat medium flowing through 10b and 10c, and the primary heat medium flowing through 9c is used as the secondary heat medium flowing through 10a and 10b. Heat the heating medium. However, the primary heat medium flowing through 9d is 10a on one side.
Because only the secondary heat medium flowing through the heat medium is heated, the secondary heat medium flowing through 10a is given a larger amount of heat than the other secondary heat medium, and the temperature T ₁ becomes higher (ΔT ₁ > T _2). = T _3). The secondary heat medium flowing through 10b and 10c is heated from both sides by the primary heat medium flowing through 9a... 9c arranged on both sides, whereas the secondary heat medium flowing through 10d is Is heated only by the primary heat medium flowing through the one side 9a, the temperature T4 becomes lower than that of the other secondary heat medium (ΔT ₁ > T
_{2 = T 3> T 4)} .

As described above, in the conventional plate heat exchanger, of the plurality of secondary heat medium passages 10a,..., 10d, the most upstream passage 10a and the most downstream passage 10d are formed. Since the amount of heat received by the flowing secondary heat medium is different from that of other parts, excessive heating and insufficient heating in this portion have been problematic.

Therefore, an object of the present invention is to prevent partial overheating or insufficient heating in a heat exchanger having a plurality of secondary heat medium passages.

[0010]

In order to achieve the above object, according to the present invention, a heat transfer plate having a plurality of passage holes is laminated, and a supply passage of a primary heat medium and a secondary heat medium are formed by passage holes communicating with each other. A medium supply path is defined and a primary heat medium flow path and a secondary heat medium flow path are alternately formed between adjacent heat transfer plates. The primary heat medium supplied to the primary heat medium flow path and the secondary heat medium supplied to the secondary heat medium flow path from the secondary heat medium supply path through another passage hole, In the case where heat is exchanged through each heat transfer plate, only the passage holes located at the most downstream positions of the primary and secondary heat medium supply passages have smaller opening areas than the other passage holes.

[0011]

The opening area of only the most downstream passage holes of the primary and secondary heating medium supply passages is made smaller than the opening areas of the other passage holes, so that the heating medium is passed through the passage holes. , The flow rate of the heat medium in the flow path supplied is reduced. For example, as shown on the right side of FIG. 5, in the primary heat medium flow path (9d) on the most downstream side, by reducing the opening area of the passage hole (b ₄ ) located on the most downstream side, the first heat medium flowing through 9d is reduced. The flow rate of the secondary heat medium decreases. Then, the heat receiving amount of the secondary heat medium passage 10a to which the heat exchanger is reduced, the temperature T ₁ of the secondary heat medium flowing through 10a is reduced. _{Thus, T 1 = T 2 = T} 3 is achieved by appropriately adjusting the opening area of the b _4.

Further, as shown on the left side of FIG. 5, the secondary heat medium passage 10d of the most downstream side, by reducing the opening area of the passage hole a _4, secondary heat medium flowing through the flow path 10d Flow rate is reduced. Then, the amount of heat received from the primary heat medium flowing through the 9a is increased by unit quantity per secondary heat medium flowing 10d, As a result, the temperature T ₄ of the secondary heat medium flowing through 10d is increased. Accordingly, by appropriately changing the opening area of _{a 4, T 1 = T 2} = T 3 = T 4 is achieved.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same members as those of the conventional device are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows a heat transfer plate (1) shown in FIG.
(1 ′) is a cross-sectional view taken along line AA of a plate heat exchanger in which a plurality of (1 ′) are laminated via a gasket (2) and sandwiched between end plates (13) and (14) from both sides. In this plate heat exchanger, the primary heat is formed by the cooperation of the gasket (2) and the passage holes (3) (6)... Which communicate with each other above the heat transfer plates (1) (1 '). A medium supply passage (7) is formed, and similarly, at the lower part of the heat transfer plates (1) (1 '), passage holes (3) (6)... , A secondary heat medium supply path (12) is formed. Also, on the gasket mounting surface side of the heat transfer plate (1 '),
A secondary heat medium flow path (9) is formed on the gasket mounting surface side of the heat transfer plate (1).

The primary heat medium supplied from the primary inlet pipe (15) passes through the passage hole (3) while flowing through the primary heat medium supply path (7), and then flows through each of the primary heat medium passages (9). ). On the other hand, the secondary heat medium supplied from the secondary inlet pipe (16) flows through the secondary heat medium supply passage (12) while passing through the passage hole (6).
After passing through the secondary heat medium flow passages (10). Then, the primary heat medium and the secondary heat medium exchange heat via the heat transfer plates (1) and (1 '), and the low-temperature secondary heat medium is heated by the high-temperature primary heat medium. After the heat exchange, the primary heat medium and the secondary heat medium flow into the primary liquid collecting passage (11) and the secondary liquid collecting passage (8) as shown in FIG. The liquid is discharged to the outside by a discharge pipe (both not shown) attached to the distal ends of the liquid passages (11) and (8).

The opening diameter of the passage hole (3 ') for supplying the primary heat medium to the primary heat medium flow path (9') located at the right end of FIG. 1 is the primary heat medium supply path (7). Are smaller than the diameters of the other passage holes (3) and (6). A passage hole (6 ') for supplying the secondary heat medium to the secondary medium flow path (10') located at the left end portion in Fig. 1 is another passage hole constituting the secondary heat medium supply path (12). The diameter of the passage holes (3) and (6) is smaller than the diameter of the passage holes (3) and (6). With such a configuration, the 1
The flow rate of the heat medium flowing through the next and second heat medium flow paths (9 ') (10') is reduced as compared with the other flow paths (9) and (10).

FIG. 3 is a schematic diagram showing the above configuration. In this schematic diagram, for simplification, the heat transfer plate (1) is shown in FIG.
The number of (1 ′) is reduced.

In FIG. 3, the solid line indicates the flow path of the primary heat medium, and the broken line indicates the flow path of the secondary heat medium. Also,
a ′ ₁ , a ′ ₂ , and a ′ ₃ indicate passage holes (6) for supplying the secondary heat medium to the secondary heat medium passage (10), and a ′ ₄ indicates a passage hole (6) formed in a small diameter. '). On the other hand, 10a ', 10b', 10
c 'indicates the secondary heat medium flow path (10), and 10d' indicates the secondary heat medium flow path (10 ') having a small flow rate. Similarly, b ′ ₁ , b ′
₂ and b ′ ₃ indicate passage holes (3) for supplying the primary heat medium to the primary heat medium passage (9), and b ′ ₄ indicates a small-diameter passage hole (3 ′). On the other hand, 9a'9b'9c 'indicates the primary heat medium flow path (9), and 9d' indicates the primary heat medium flow path (9 ') having a small flow rate. T ′ ₁ ... T ′ ₄ indicate the temperatures of the secondary heat medium after the end of the heat exchange.

As described above, since the flow rate of the primary heat medium flowing through 9d 'decreases, the amount of heat received by the secondary heat medium flowing through 10a' on the side decreases, and the secondary heat medium flowing through 10a 'decreases. The temperature T′1 of the medium decreases. Therefore, T ′ ₁ = T ′ ₂ = T ′ ₃ can be achieved by appropriately adjusting the opening diameter of b ′ ₄ .

Further, since the flow rate of the secondary heat medium flowing through 10d 'decreases, the amount of heat received per unit amount of the secondary heat medium increases, and as a result, the secondary heat medium flowing through 10d' flows. Temperature T ′ ₄ rises. Therefore, T ′ ₁ = T ′ ₂ = T ′ ₃ = T ′ ₄ can be achieved by appropriately changing the opening diameter of a′4.

Thus, according to the present invention, the primary and secondary
Only the passage holes (3 ′) and (6 ′) located at the most downstream side of the secondary heat medium supply passages (7) and (12) have their opening areas larger than the opening areas of the other passage holes (3) and (6). Because it is small,
The flow rate of the heat medium in the primary and secondary heat medium flow paths (9 ') and (10') to which the primary and secondary heat medium is supplied from the passage holes (3 ') and (6') is other flow path. (9) Less than (10). Accordingly, it is possible to prevent excessive heating of the secondary heat medium flowing through the secondary heat medium flow path (10a 'in FIG. 3) in which heat is exchanged with the flow path (9': 9d 'in FIG. 3). Channel (10 ': 10 in the figure)
Insufficient heating of the secondary heat medium flowing through d ') can be prevented, and uniform heat exchange can be performed in all flow paths. Therefore,
For example, even when hot water is used as the primary heat medium and food fluid is used as the secondary heat medium, the food fluid can be uniformly heated in each flow path. If the small-diameter passage holes (3 ') and (6') are provided at the most downstream side of the two medium supply passages (7) and (12), the processing capacity per unit time of the entire apparatus is significantly reduced. Therefore, the same processing capacity as that of the conventional apparatus can be secured.

In this embodiment, only the case where the secondary heat medium is heated with the primary heat medium has been described. However, the above-described configuration can be applied to the case where the secondary heat medium is cooled with the primary heat medium. .

[0024]

According to the present invention, the opening area of only the most downstream passage holes of the primary and secondary heat medium supply passages is smaller than the opening areas of the other passage holes. Thus, the flow rate of the heat medium flow path to which the heat medium is supplied from the small-diameter passage hole can be reduced. Accordingly, it is possible to eliminate insufficient heating or excessive heating of the secondary heat medium flowing through the flow path or flowing through the flow path performing heat exchange with the flow path, and uniform heat exchange is possible in all flow paths. Become.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state of lamination of heat transfer plates.

FIG. 3 is a schematic view showing an arrangement of a primary heat medium flow path and a secondary heat medium flow path of the plate heat exchanger according to the present invention.

FIG. 4 is a perspective view showing the state of attachment of the gasket to the heat transfer plate.

FIG. 5 is a schematic view showing an arrangement of a primary heat medium flow path and a secondary heat medium flow path in a conventional plate heat exchanger.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat transfer plate 1 ′ heat transfer plate 2 gasket 3 passage hole 6 passage hole 7 primary heat medium supply passage 9 primary heat medium passage 10 secondary heat medium passage 12 secondary heat medium supply passage

Claims (1)

(57) [Scope of request for utility model registration] A heat transfer plate having a plurality of passage holes is laminated, and a supply passage for a primary heat medium and a supply passage for a primary heat medium are formed by passage holes communicating with each other.
In addition to forming a supply path for the secondary heat medium, the primary heat medium flow path and the secondary heat medium flow path are alternately formed between adjacent heat transfer plates. The primary heat medium supplied to the flow path of the primary heat medium via the second heat medium, and the secondary heat medium supplied to the flow path of the secondary heat medium from the secondary heat medium supply path via another passage hole. Heat exchange via each heat transfer plate, only the passage holes located at the most downstream of the primary and secondary heat medium supply passages each have an opening area smaller than that of the other passage holes. A plate heat exchanger characterized by the following.