JPH0375496A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent various impurities from adhering into a heat exchange flow passage and hence assure satisfactory heat exchange with good efficiency by providing in a supply flow passage flow rate maintaining means which is to prevent a heat exchange fluid flowing in the supply flow passage from being lowered in its rate. CONSTITUTION:A substantially conical partition member 41 is inserted into a supply tube 25 substantially coaxially with the supply tube 25, located upstream at the top side the supply tube 25. A partition flow passage 44, since formed with the partition member 41, is reduced in its sectional area in a plane perpendicular to a flow in the partition flow passage 44 as the flow goes downward. Accordingly, the flow rate of the heat exchange fluid 35 flowing into the supply tube 25 is gradually reduced because the flow flows down successively into a heat exchange flow passage 28 formed between the heat transfer plates, but the speed of the flow is lowered because a flow passage sectional area is gradually reduced during the flow running in the partition flow passage 44. Hereby, satisfactory heat exchange is achieved without impurities such as microorgans and the like adhering in the heat exchange flow passage 28.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a plate-type heat exchanger that exchanges heat between fluids flowing between a large number of heat exchanger plates.

<Prior Art> As shown in FIG. 4, which is a perspective view of a conventional plate heat exchanger, the heat exchanger includes a large number of heat transfer plates 11 formed by forming thin metal plates by press working or the like. The heat transfer member 10 is constructed by laminating the heat transfer member 10, which is sandwiched between a thick metal fixed plate 12 and a movable plate 13 from both sides, and is fixed to each other by tightening bolts 14. These are fixed plate 12. Support # provided on one or both of the movable plates 13
15 and support legs 18 provided on columns 17 of beams 16 for suspending the device.

In addition, the fifth figure shows a partially exploded view of the heat transfer member 10.
It is a diagram. As shown several times, through holes 19, 20°, 21, and 22 are bored at the four corners of each heat exchanger plate 11.

These heat exchanger plates 11 are divided into the following two types.

In other words, in one type, the gasket 23 is fixedly fixed on the heat transfer plate 11 so as to surround each of the vertically paired through holes 19 and 20, and the gasket 23 is fixedly attached to the heat exchanger plate 11. The pair of through holes 21.12 adjacent to the holes 19.20 are each surrounded by a separate gasket 24 tightly fixed on the heat exchanger plate 11.

Furthermore, in another type of heat exchanger plate 11 disposed adjacent to this type of heat exchanger plate 11, a pair of through holes 21, 22 are provided.
A gasket 23 is closely fixed on the heat exchanger plate 11 so as to surround each of the gaskets 23 and 23, and the remaining pair of through holes 19 and 20 are individually and closely fixed on the heat exchanger plate 11. surrounded by a gasket 24.

In this way, the two types of heat transfer plates 11 as described above are stacked adjacently one after another, so that the heat transfer member 10
is constructed, and a flow path for the heat exchange fluid flowing within the heat transfer member 10 is formed.

That is, as shown in FIG. 6, which is a side sectional view of the heat transfer member 10, a heat exchange fluid flow path is formed by the overlapping through holes 19 and the gaskets 23 and 24 interposed between the heat transfer plates. A supply pipe 25 is fitted along the flow path. The inlet part (left side in the figure) of the supply pipe 25 is connected to an inlet nozzle 26 bored in the upper part of the fixed plate 12, and the end of the supply IW 25 located on the right side in the figure is closed. Further, an outlet 27 is formed at the lower part of the supply pipe 25, and the heat exchange fluid flows downward through the outlet 27.

The heat exchange fluid that has flowed down in this way is transferred to the adjacent heat exchanger plate 11.
and gaskets 23 sandwiched between these heat exchanger plates 11.

The flow then flows into the discharge passage 29 formed by the overlapping through holes 20 and the gaskets 23 and 24 interposed between the heat exchanger plates, and further flows to the outside through the outlet nozzle 30 bored in the lower part of the fixed plate 12. is discharged.

On the other hand, in the flow path formed by the other pair of through holes 21, 22, etc., another fluid that exchanges heat with the above-mentioned heat exchange fluid flows, and the flow of this fluid is the same as that of the above-mentioned heat exchange fluid. It is set in the opposite direction to the flow direction.

That is, the overlapping through hole 22 and gasket 23.2
4 forms a supply channel (not shown). The heat exchange fluid flowing through the inlet nozzle 31 bored at the bottom of the fixed plate 12 and flowing through the supply flow path is transferred to the adjacent heat transfer plate 12.
1 and the gaskets 23 sandwiched between the heat exchange plates 11 and located adjacent to the heat exchange flow Wi28, the heat exchange flow path 32 flows from the bottom to the top in the figure,
During this time, heat exchange takes place between the fluids flowing in the respective heat exchange channels 28,32. In this way, the fluid further flows through a discharge passage (not shown) formed by the overlapping through holes 21 and gaskets 23 and 24, and is discharged to the outside from an outlet nozzle 33 formed in the upper part of the fixed plate 12.

FIG. 7 schematically shows the structure of the conventional plate heat exchanger as described above. That is, a pump 34 is provided on the upstream side of one of the supply channels (supply pipes 25) formed in the heat transfer member 10 of the heat exchanger, and the pump 34 connects the supply channels (supply pipes 25). One heat exchange fluid 35 is pumped into the heat exchange channel 28 between the heat exchanger plates.
The liquid flows inside and is discharged to the outside through the discharge channel 29.

Further, a pump 37 is provided on the upstream side of the other supply flow path 36 similarly formed in the heat transfer member lo, and the pump pumps the other heat exchange fluid 38 into the supply flow path 36 for further transmission. The fluid flows in the heat exchange channel 32 between the hot plates, and heat exchanges with the fluid in the adjacent heat exchange channel 28 between them. After this, the discharge stream 939 flows through the outlet nozzle 3.
Send it to the outside from 3.

<Problems to be Solved by the Invention> In the conventional plate heat exchanger as shown in FIG. It flows down into the formed heat exchange channel 28.

Therefore, the flow velocity of the heat exchange fluid 35 in the supply pipe 25 becomes smaller on the downstream side, and the flow velocity of the fluid 35 in the heat exchange passage 28 also decreases in the heat exchange passage 28 located on the downstream side (right side in the figure).
The lower the value, the lower the value tends to be. Therefore, for example, when seawater is used as the heat exchange fluid 35, microorganisms and contaminants in the seawater accumulate and adhere to the flow paths where the flow velocity decreases as described above, narrowing these flow paths and causing the following problems. There is a problem in that this causes a further decrease in flow rate and impedes the heat exchange.

Furthermore, when seawater is used as the heat exchange fluid, the temperature of the seawater, especially in winter, can be significantly different from the design temperature of the heat exchanger, so it is necessary to reduce the flow rate of the seawater to increase the efficiency of heat exchange. However, here as well, there was a problem in that the flow velocity in the heat exchange flow g@28 was greatly reduced, further aggravating the above-mentioned problems.

Means for Solving the Problems> A plate-type heat exchanger according to the present invention includes a heat transfer member formed by laminating a large number of heat transfer plates, and a heat transfer member formed between each of the heat transfer plates, through which a heat exchange liquid flows. a heat exchange flow path, a supply flow path provided along the stacking direction of the heat exchanger plates to feed the heat exchange liquid into the heat exchange flow path, and a discharge flow to discharge the heat exchange liquid from the heat exchange flow path. The plate heat exchanger is characterized in that the supply flow path is provided with a flow rate maintaining means for preventing a decrease in the flow speed of the heat exchange liquid flowing in the supply flow path.

Further, the flow rate maintaining means may be a partition member provided in the supply flow path and narrowing the cross-sectional area of the supply flow path toward the downstream side in the flow direction of the heat exchange liquid, or alternatively, a partition member provided on the upstream side of the supply flow path. In addition, in order to adjust the liquid temperature of the heat exchange liquid at the inlet position of the supply flow path, the downstream side of the discharge flow path and the upstream of the supply flow path are configured. It is characterized by connecting the two sides with a conduit.

Effect> The heat exchange liquid flows in the supply channel formed along the stacking direction of the heat exchanger plates, and the heat exchange channel further communicates with the supply channel and is formed between the stacked heat exchanger plates. Heat is exchanged between the tubes through which the heat exchange liquid flows, and is then discharged to the outside through the discharge channel.

At this time, by providing a flow velocity maintaining means in the supply channel to prevent a decrease in the flow velocity of the flow in the supply channel, the flow velocity of the flow flowing into all the heat exchange channels can be averaged.

In addition, the partition member provided as the flow rate maintaining means decreases the cross-sectional area of the supply flow path as it goes downstream, so that the flow rate of the flow in the supply flow path, where the flow rate decreases on the downstream side, is reduced. Never. Furthermore, a bypass pipe is provided that connects the upstream side and the downstream side of the supply flow path, and the heat exchange liquid is also allowed to flow through the bypass pipe, making it possible to maintain a higher flow rate within the supply flow path. . In addition, by connecting the downstream side of the discharge flow path and the upstream side of the supply flow path with a pipe,
The heated fluid flowing out of the discharge channel can be mixed with the fluid to be supplied, thereby increasing the temperature of the fluid and supplying it to the heat exchanger.

Embodiments Hereinafter, an embodiment of the plate heat exchanger according to the present invention will be described in detail with reference to the drawings.

Note that the same members as in the prior art are denoted by the same reference numerals, and redundant detailed explanations will be omitted.

A schematic cross-sectional view of an embodiment of the present invention is shown in FIG.

This figure corresponds to the previously described FIG. 6, and is generally different from the conventional example shown in FIG. 6 in the following points.

That is, a substantially conical partition member 41 is inserted into the supply pipe 25 so as to be substantially concentric with the supply pipe 25, with the apex side located on the upstream side of the supply pipe 25 (on the left side in the figure). There is. The left end of the cough partition member 41 in the figure is closed by 1 gg, and is fixed within the supply pipe 25 by a support member 42. Also, the right end of the partition member 41 has a flange 43! Therefore, while being fixed to the fixed plate 12, the flange 43 closes off the right end of the supply 9125. Here, since the support member 42 is sufficiently small compared to the cross-sectional area of the supply pipe 25, the heat exchange fluid 35 flowing from the right side in the figure of the supply #R25 is hardly hindered in its flow. Passing through the support member 42, furthermore, the partition member 4
1 and the inner surface of the supply pipe 25 .

By the way, since the partition flow u44 is formed by the partition member 41 having the shape and attachment state described above, the cross-sectional area of the partition flow path 44 in a plane perpendicular to the flow increases as it goes downstream. Decrease. Therefore, on the one hand, the supply pipe 2
The flow rate of the heat exchange fluid 35 that has flowed into the heat exchange fluid 35 gradually decreases as it flows down into the heat exchange flow path 2B formed between the heat exchanger plates, but as it flows through the partition flow path 44, Since the cross-sectional area of the flow path gradually decreases, the flow velocity of the flow hardly decreases. Therefore, the flow rate of the heat exchange fluid 35 flowing through each heat exchange channel 28 is always maintained at a high value, and even if seawater or the like is used as the heat exchange fluid 35, contaminants such as microorganisms will not enter the heat exchange channel 28. There is no adhesion,
This achieves good heat exchange.

FIG. 2 shows another embodiment. That is, in this example,
Instead of using the conical partition member 41, a substantially plate-shaped partition member 45 is installed inside the supply pipe 25. Specifically, one end of the partition member 42 is attached to the upper left end of the supply pipe 25 in the figure, and the other end of the partition member 42 is attached to the lower right end of the supply pipe 25 in the figure. There is. Therefore, the partition flow in the supply pipe 25! The cross-section product of R1I46 becomes smaller toward the downstream side in the flow direction. Therefore, the same operation and effect as the embodiment already described with reference to FIG. 1 is produced.

By the way, in the embodiment described using FIGS. 1 and 2, the partition members 41 and 45 were provided inside the supply pipe 25, but the supply pipe 25 was not attached, and therefore the through hole 19
It may also be inserted directly into the supply channel formed by the gaskets 23, 24. Of course, these partition members 4
1.45 may be inserted into another supply flow path, that is, a flow path formed by the through hole 22 and the gaskets 23 and 24. Furthermore, the shapes of these partition members 41 and 45 are also
The present invention is not limited to the above-mentioned embodiments, but any shape may be used as long as the cross-sectional area of the supply channel is smaller on the downstream side of the flow.

Another embodiment is shown in FIG. This figure corresponds to FIG. 7 showing the conventional example, and the same members as in the conventional example are denoted by the same symbols.

That is, in this embodiment, the supply flow $36 and the supply flow path 3
A bypass pipe 47 is further branched from a branch point P with the heat exchange channel 32 located on the most downstream side of the heat exchange channel 6 . On the other hand, the end of the bypass pipe is connected to a flow g&48 on one side of the pump 37, which is provided in communication with the supply flow path 36.

Therefore, by providing the bypass pipe, the heat exchange fluid 38 can be pumped from the pump 37 at a larger flow rate than before, so even if it reaches the downstream side of the supply channel 36, the heat exchange fluid 38 The flow velocity of is maintained at a relatively large value. For this reason, even if seawater or the like is used as the heat exchange fluid 38, the flow velocity in each heat exchange channel 32 will not be significantly reduced, so that various contaminants in the seawater will not flow into the heat exchange channel 32. This prevents the adhesion of heat, thereby achieving good heat exchange.

Further, in this embodiment, the discharge flow Ji@39 and the flow path 48 on the upstream side of the pump 37 are communicated through another bypass pipe 49. According to the bypass pipe 49, the heat exchange fluid 38 that has undergone heat exchange through the heat exchange flow path 32 is mixed again with the fluid before heat exchange on the inlet side of the pump 37, thereby changing the heat exchange fluid 38 before heat exchange. 37 temperatures can be adjusted. Therefore,
By using seawater as the heat exchange fluid 38, for example, when large temperature fluctuations occur depending on the season, the temperature of the heat exchange fluid 38 can be adjusted to approach the design value of the heat exchanger, which is better. Achieve effective heat exchange.

By the way, in this embodiment, bypass pipes 47 and 49 are provided only in the flow path related to the heat exchange fluid 38 pumped by the pump 37, but similar bypass pipes are provided in the flow path related to the other heat exchange fluid 35. You can.

<Effects of the Invention> According to the plate-type heat exchanger of the present invention, a heat exchange channel is formed between a large number of laminated heat transfer plates, and a supply stream for sending and discharging a heat exchange liquid to and from the heat exchange channel is formed. The passage and the discharge passage are each provided along the stacking direction of the heat exchanger plates, and furthermore, in order to prevent a decrease in the flow velocity of the heat exchange liquid in the supply passage, the cross-sectional area of the supply passage is made as small as possible on the downstream side. By providing a flow rate maintaining means such as a partition member that connects the upstream side and the downstream side of the supply flow path, or a bypass pipe that connects the upstream side and the downstream side of the supply flow path, the flow speed in each heat exchange flow path can be maintained at a relatively large value. It is possible to prevent various impurities from adhering to the inside of the heat exchange channel, thereby achieving good and efficient heat exchange.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of the plate heat exchanger according to the present invention, FIG. 2 is a schematic cross-sectional view of another embodiment, and FIG. 3 is a schematic cross-sectional view of another embodiment. Conceptual diagram, 4th
The figure is a perspective view of a conventional example, FIG. 5 is an explanatory diagram showing the heat transfer plate separated, FIG. 6 is a schematic cross-sectional view of the conventional example, and FIG. 7 is a conceptual diagram of this conventional example. be. In the drawing, 11 is a heat transfer plate, 12 is a fixed plate, 13 is a movable plate,
19, 20, 21, 22 are through holes, 23, 24 are gaskets, 25 are supply pipes, 28° and 32 are heat exchange channels, 29.
39 is a discharge flow path, 34.37 is a pump, 35.38 is a heat exchange fluid, 41.45 is a partition member, 44.46 is a partition flow path, and 47.49 is a bypass pipe. Fig. 1 12: Fixed plate: Heat exchange fluid: Ishikiri member: Support member: Ishikiri flow path 2nd Fig. 11: Heat transfer plate 12: Fixation plate 6: Ishikiri flow path 4th Fig. 6 No. 5 Figure 6

Claims (3)

[Claims] (1) A heat transfer member formed by laminating a large number of heat transfer plates, a heat exchange channel formed between each of the heat transfer plates through which a heat exchange liquid flows, and a heat exchange channel formed between the heat transfer plates along the stacking direction of the heat transfer plates. In the plate type heat exchanger, the supply flow path is provided with a supply flow path for feeding the heat exchange liquid into the heat exchange flow path, and a discharge flow path for discharging the heat exchange liquid from the heat exchange flow path. A plate type heat exchanger, characterized in that the supply channel is provided with a flow rate maintaining means for preventing a decrease in the flow rate of the heat exchange liquid flowing therethrough. (2) The flow rate maintaining means is a partition member that is provided in the supply flow path and narrows the cross-sectional area of the supply flow path toward the downstream side in the flow direction of the heat exchange liquid. The plate heat exchanger according to (1). (3) The flow rate maintaining means is a bypass pipe that connects the upstream side and the downstream side of the supply flow path, and in order to adjust the temperature of the heat exchange liquid at the inlet position of the supply flow path, 2. The plate heat exchanger according to claim 1, wherein the downstream side of the discharge flow path and the upstream side of the supply flow path are connected by a pipe.