JPS6341788A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the heat loss of a plate type heat exchanger by forming heat insulating spaces in which air spaces are disposed between a stand frame and an end frame, and heat transfer plates. CONSTITUTION:By stacking multiple heat generating plates P1-Pn between a stand frame S and an end frame E, alternating flow passages A, B in which heating or cooling medium 1 and processed liquid 2 flow separately are formed. The first heat generating plate P1 and the final heat generating plate Pn are disposed to oppose heat insulating plates 11s, 11E with a suitable space in between to allow the presence of air between the heat insulating plate 11s and the first heat generating plate P1, and the heat insulating plate 11E and the final heat generating plate Pn so as to form heat insulating spaces 12S, 12E. When a heat exchange takes place between the heating or cooling medium 1 flowing in the passage A and the processed liquid 2 flowing in the passage B, the heat insulating spaces 12S, 12E interrupt the heat radiation or heat absorption to reduce the heat loss.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to a plate heat exchanger, particularly to its heat insulating structure.

A plate heat exchanger is a plate heat exchanger in which multiple heat transfer plates are stacked between the stand frame and the end frame via a gas lid, forming alternating flow paths for two types of heat exchange media. Used in industrial fields.

In the above plate heat exchanger, steam, hot water, etc. are used as a heating medium for the liquid to be treated, and prine, chiller water, etc. are used as a cooling medium. These heating medium or cooling medium (1) and the liquid to be treated (2) to be heated or cooled by heat exchange flow into the respective flow channels arranged alternately, and exchange thermal energy by heating or cooling.

In the plate heat exchanger described above, the number of alternating flow paths for the heat exchange medium is selected according to its heat exchange capacity. a flow path (A) for introducing a heating medium or a cooling medium (1) as shown in FIG.
Either select the flow path configuration so that the number of channels (B) that introduces the liquid to be treated (2) is the same as that of the flow path (B), or select either of the above flow paths (A) or (B) as shown in FIG. The channel configurations are selected such that one channel has one channel more than the other channel.

When the flow path configuration illustrated in Figure i4 is adopted in a conventional plate heat exchanger, the heat transfer plate (3s) is heated to a high temperature by exchanging thermal energy with the heating medium or cooling medium (1). or cooled to low temperatures. In this case, the stand frame (S) and end frame (E) are installed in order to reduce heat loss due to heat radiation or heat absorption of the heat transfer plate (3s) and to prevent heat energy from dissipating into the surrounding environment. Countermeasures have been taken, such as making the heat exchanger thicker and larger to increase its heat capacity, or surrounding the main body of the plate heat exchanger with a heat insulating material, but both methods are disadvantageous in terms of cost. Furthermore, in terms of operability during disassembly and inspection, considerable labor is required due to the heavy weight and the installation and removal of the heat insulating material.

The main object of the present invention is to provide a solution to the problems observed in conventional plate heat exchangers, especially their insulation structure.

As a means for solving the above-mentioned problems, the present invention provides a plate-type heat exchanger in which a plurality of heat transfer plates are stacked between a stand frame and an end frame to form alternating flow paths for two types of heat exchange media. In the apparatus, a heat insulating plate is arranged adjacent to the inside of the stand frame and the end frame, and first and final heat transfer plates are arranged opposite to the heat insulating plate at a predetermined interval, and the heat insulating plate and the first
The present invention also provides a plate heat exchanger in which an adiabatic space is formed between the final heat transfer plates by the presence of air.

In the heat exchanger formed by the dish stand frame and end frame and the laminated heat transfer plates, by forming an insulating space with air between the stand frame and end frame and the heat transfer plate. , reducing heat loss in plate heat exchangers.

FIG. 1 is a schematic sectional view of a plate heat exchanger illustrating a basic embodiment of the present invention. In the embodiments described below, the same constituent members are in principle indicated by the same reference numerals or reference numerals, and explanations regarding overlapping matters will be omitted.

The plate heat exchanger has multiple sheets (one plate) depending on the heat exchange capacity between the stand frame (S) and the end frame (E).
~n) heat transfer plates (P1=Pn) are stacked to create alternating channels through which two types of heat exchange media, namely the heating medium or cooling medium (1) and the liquid to be treated (2) flow separately. (A) and (B), and the insides of the stand frame (S) and end frame (E) are provided with insulation plates (IIs) and (l11
1) and the insulation plate ) (IIs
) and (llFL), a first heat transfer plate (PI) and a final heat transfer plate (Pn) are placed opposite each other at a predetermined interval. Thus, insulation play) (lls)
and the first heat transfer plate (Pr), and between the heat insulating plate (IIE) and the final heat transfer plate (Pn), there is a heat insulating space (12s) (12a) in which air is present.
) is formed.

In addition, since the heat insulating plates (lls) (l1g) are manufactured from plate-like members with the same dimensions as the heat transfer plates (P!~Pn), the heat transfer plates can be used as is if necessary. be.

Since the device of the present invention is configured as described above, the flow path (A
) flowing through the heating medium or cooling medium (1) and the flow path (B
) When heat exchange is performed with the liquid to be treated (2) flowing through the chamber, the heat insulating spaces (12s) and (12B) block heat radiation or absorption, reducing heat loss and transferring thermal energy to the surrounding environment. Contributes to preventing the emission of

In this embodiment, heat insulating spaces (12s) and (12ε) are provided on the stand plate (S) side and the end plate (E) side, respectively, but a different embodiment may be arranged with alternate flow paths. Stand plate (S) depending on the form
It is also possible to provide a heat insulating space on either the side or the end plate (E) side.

The above explanation is about a decomposable plate heat exchanger in which a predetermined number of heat transfer plates (P+) (P2)-(Pn) are stacked together via a gasket (10). and (12B) also apply to a single-piece plate heat exchanger in which a predetermined number of heat transfer plates are brazed to form alternating flow paths for two types of heat exchange media! It can be formed by a method similar to 7'i.

Husband's shoes 1 In this example, 2nd! ! The insulation space (1
As a means of absorbing pressure fluctuations due to expansion or contraction of air in (2s) and (12a), insulation plates (IIs
) and (llFL), lfT thermal space (12s)
and (12B) stand frame (S)
Or the surface facing the end frame (E) or the air hole (1
3) is drilled.

In this embodiment, a heat insulating space (12
s) and (1211) as a means of absorbing pressure fluctuations due to expansion or contraction of air in
The gasket (10) is fixed to the first heat transfer plate (Pl) placed opposite to the first heat transfer plate (Pl), and the gasket (10) is fixed to the final heat transfer plate (11ε) placed opposite to the final heat transfer plate (Pn). The gasket (10) has a notch (for guiding the air in the heat insulating spaces (12s) and (12p) to the outside of the system and for introducing air outside the system into the heat insulating spaces (12s) and (12[1). 14).

Results of Lambda Dish As can be understood from the above explanation, in a plate heat exchanger formed by a stand frame, an end frame, and a laminated heat transfer plate, the stand frame, end frame, and heat transfer plate By forming an insulating space with air between the plate heat exchanger and the plate heat exchanger, it is possible to reduce the heat loss of the plate heat exchanger due to heat radiation or heat absorption, and to suppress the dissipation of thermal energy to the surrounding environment. . In addition, since the device of the present invention has an extremely simple structure, a heat exchange system with low heat loss can be constructed by only partially modifying a conventional plate heat exchanger.

The present invention reduces the weight of the stand frame and end frame, eliminates the need for heat insulating material, reduces costs, and at the same time exhibits a remarkable effect in improving the operability of the plate heat exchanger.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a plate heat exchanger illustrating a basic embodiment of the present invention, and FIGS. 2 and 3 are schematic front views of a heat insulating plate illustrating an embodiment of the present invention. It is. FIG. 4 is a schematic cross-sectional view of a conventional plate heat exchanger. (S) - Stand frame, (E) - End frame, (P+) (P2) - (Pn) - Heat transfer plate, (1) - Heating medium or cooling medium, (
2) -m-Liquid to be treated, (A) (B)--Alternate flow path, (1
0)・-gasket, (lls) (lla)-m-insulation plate, (
12s) (12+ri・-・insulation space, (13)・
-Air holes, (14) -Notches. □－－－－－－１ Patent issuer Hikyoku Seisakusho Co., Ltd.
I :'-ichigo-221' Figure 1 Figure 4

Claims (3)

[Claims] (1) In a plate heat exchanger formed by stacking a plurality of heat transfer plates between a stand frame and an end frame to form alternating flow paths for two types of heat exchange media, the stand frame and the end frame A heat insulating plate is arranged adjacent to the inner side of the heat insulating plate, and first and final heat transfer plates are arranged opposite to the heat insulating plate at a predetermined interval, and air is interposed between the heat insulating plate and the first and final heat transfer plate. A plate heat exchanger characterized by forming an adiabatic space. (2) The plate heat exchanger according to claim 1, wherein the heat insulating plate has air holes for absorbing pressure fluctuations due to expansion or contraction of air in the heat insulating space. (3) A notch is formed in the gasket fixed to the first heat transfer plate or the final heat insulating plate to absorb pressure fluctuations due to expansion or contraction of air in the heat insulating space. Plate heat exchanger described in .