JPH087252Y2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a plate heat exchanger, and is particularly suitable for use in a liquid food sterilizer for heating and sterilizing a liquid such as sake. The present invention relates to a plate heat exchanger.

[Conventional technology]

For example, sake is sterilized in the manufacturing process by heating at a constant temperature (for example, 70 ° C.) for a certain time.

FIG. 3 shows an example of the sterilization apparatus used in the sterilization process. In FIG. 3, (1) is a conventional plate type heat exchanger for heating sake to a predetermined sterilization temperature, and this plate type heat exchanger (1), as shown in FIG. A plurality of heat transfer plates (3) having openings (2) at the four corners of the surface are laminated via a gasket (4), and heating paths (5) and receiving paths (6) are alternately arranged to provide a working fluid. The heat transfer plate (3) has a liquid passage hole (7) formed by a concentric opening (2) communicating with the heat receiving path (6). ) Of the heat transfer plate (3 ′) at the outer end of the pipe (8) for the liquid outflow in which the straight pipe portion (8b) is orthogonal to the main pipe portion (8a) so as to project. 7) Installed in communication with
A rod-shaped temperature measuring element (10) is pierced through the end wall (8c) of the main tube section (8a) of the tube body (8) through a sealing ring (9), and the tip of this temperature measuring element (10) The temperature sensor (11) attached to the pipe is held inside the main pipe portion (8a) of the pipe body (8). Third
In the figure, (12) is a storage tank for storing sake to be sterilized, and (13) is a hot water tank for storing hot water as a heat medium of the plate heat exchanger (1). The storage tank (12) is in communication with the heat receiving path (6) of the plate heat exchanger (1) via the first pump (14), and the sake in the storage tank (12) is the first After being sent to the heat receiving path (6) of the plate heat exchanger (1) by the pump (14), it is sent to the next step through the inside of the liquid passage hole (7) and the pipe body (8). The hot water in the hot water tank (13) is sent to the heating path (5) of the plate heat exchanger (1) by the second pump (15) and then returns to the hot water tank (13) again. Is plumbed as. The hot water is obtained by supplying the steam generated by the steam generator (18) into the hot water circulation path through the regulating valve (16) and the in-line heater (17). The temperature of hot water is adjusted.

Then, in the case of sterilizing the sake in the storage tank (12), first, the second pump (15) is operated so that the heating path (5) of the plate heat exchanger (1) is heated to a high temperature. After flowing hot water, the first pump (14) is operated to send sake from the storage tank (12) to the heat receiving path (6) of the plate heat exchanger (1). Then, the sake is heated to a predetermined sterilization temperature in the plate heat exchanger (1) and sterilized, and then sent to the next step through the inside of the liquid passage hole (7) and the pipe body (8). Then, the temperature of the liquid of the sake heated to a predetermined sterilization temperature is detected by the temperature sensor (11) of the temperature measuring body (10) arranged so as to come into contact with the sake when passing through the tube (8) of the sake. To be done. The detected predetermined sterilization temperature is recorded by an appropriate temperature recorder to control the quality of sake.

[Problems to be solved by the device]

According to the conventional plate heat exchange, when the whole sterilizer is operating normally, the temperature sensor (11) of the temperature sensing element (10) is constantly in contact with flowing sake heated to a predetermined sterilization temperature. Therefore, the temperature sensor (11) accurately detects the temperature of the sake liquid heated to a predetermined sterilization temperature,
A predetermined sterilization temperature is recorded on the temperature recorder. However, when trouble occurs in the sake transfer route and the supply of sake to the plate heat exchanger (1) is stopped, the sake heated to a predetermined sterilization temperature is stored inside the tube (8). Since the liquid temperature of the accumulated sake is lowered due to heat radiation from the surface of the pipe body (8), the temperature sensor (11) of the temperature sensing element (10) detects the decreased liquid temperature. The temperature recorder records the lowered liquid temperature. Therefore, in the quality control of sake, it is misunderstood as if unsterilized sake that was not heated to the predetermined sterilization temperature was sent to the next process, even though the sake was heated to the predetermined sterilization temperature. There was a problem of confusion in management.

[Means for solving the problem]

The present invention has been proposed in view of the above problems, and a plurality of heat transfer plates each having an opening on a heat transfer surface are stacked so that a heating path and a heat receiving path are alternately arranged and a heat receiving path. A liquid passage hole is formed by a concentric opening communicating with the heat transfer plate, and a pipe for liquid outflow provided with a temperature measuring element is connected to the heat passage plate at the outer end of the heat transfer plate. In the plate-type heat exchanger installed as above, the temperature measuring element is attached to the tube body and the rod-shaped main body that is hermetically penetrated and fixed in the pipe body and inserted into the liquid passage hole. And a temperature sensor arranged in the liquid passage hole.

[Action]

The liquid sent to the heat receiving path is heated to a predetermined temperature by the heat medium that constantly circulates in the heating path,
It is sent to the next step through the liquid passage hole and the pipe. The liquid temperature of the liquid heated to a predetermined temperature is detected by the temperature sensor of the temperature sensing element arranged in the liquid passage hole when passing through the liquid passage hole. Further, when the liquid supply to the heat receiving path is stopped and the liquid heated to the predetermined temperature stays in the liquid passage hole, the staying liquid is kept at a constant temperature by the heat medium circulating in the heating path. The liquid temperature does not decrease. Therefore, when the liquid supply is stopped, the temperature sensor of the temperature sensing element detects the liquid temperature of the staying liquid having substantially the same temperature as the liquid temperature of the liquid at the time of liquid supply.

〔Example〕

An embodiment of the plate heat exchanger (20) according to the present invention will be described below with reference to FIG.
The same components as those shown in FIGS. 2 and 3 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, reference numeral (21) is a temperature measuring element for measuring the liquid temperature of sake which has been heated to a predetermined sterilization temperature in the heat receiving path (6), and this temperature measuring element (21) has a rod-shaped body ( 22) and a temperature sensor (23).
The liquid temperature detected in 3) is continuously recorded by an appropriate temperature recorder. The main body (22) of the temperature sensing element (21) is fixed to the tip wall (8c) of the main tube portion (8a) of the liquid outflow tube (8) through a sealing ring (9).
Moreover, the tip portion (24) is inserted into the liquid passage hole (7) formed by the concentric opening (2) of the heat transfer plate (3) communicating with the heat receiving path (6). In addition, the temperature sensor (2
The temperature sensor (23) of 1) is the tip part (24) of the body (22).
It is attached to the tip of the above and is disposed inside the liquid passage hole (7).

Then, when the sake of the storage tank (12) is sent to the heat receiving path (6) of the plate heat exchanger (20) by the operation of the first pump (14), the sent sake is delivered. Is the second
After being sterilized by being heated to a predetermined sterilization temperature by high-temperature hot water that constantly circulates in the heating path (5) by the operation of the pump (15), the inside of the liquid passage hole (7) and the pipe body (8). And sent to the next process. Then, the liquid temperature of the sake, which has been heated to a predetermined sterilization temperature, is the temperature sensor (23) of the temperature measuring element (21) arranged in the liquid passage hole (7) when passing through the liquid passage hole (7) of the sake. ), It is recorded by an appropriate temperature recorder. Further, a trouble occurs in the sake transfer path, so that the supply of the sake to the heat receiving path (6) of the plate heat exchanger (20) is stopped, and a predetermined sterilization temperature is set in the liquid passage hole (7). When the heated sake has accumulated, the accumulated sake is kept at a temperature substantially the same as the sterilization temperature by the hot water circulating in the heating path (5), and the liquid temperature does not decrease. At this time, since the temperature sensor (23) of the temperature sensing element (21) is arranged in the liquid passage hole (7) and is in contact with the accumulated sake,
The temperature sensor (23) detects the liquid temperature of the retained sake at a temperature substantially the same as the sterilization temperature. The detected liquid temperature of the retained sake is recorded by the temperature recorder. Therefore, when the sake is delivered to the plate heat exchanger (20),
When the liquid delivery of sake is stopped, the liquid temperature of the sake detected by the temperature sensor (23) is substantially the same, and the temperature recorder continuously records a predetermined sterilization temperature.

In the present invention, as shown in FIG. 2, the main pipe portion (8a) of the pipe body (8) is divided into the flange portions (2) of the divided pipe portions (8d) (8e).
5) (25 ') with the gasket (26) interposed, the bolt (2
Of course, it can also be applied to a two-part structure in which the nut (28) and the nut (28) are tightened and fixed airtightly.

[Effect of device]

According to the present invention, since the liquid temperature of the liquid detected by the temperature sensor is substantially the same when the liquid is fed to the plate heat exchanger and when the liquid is stopped,
When used in a sterilizer for liquid food such as sake, the temperature sensor of the temperature measuring element detects a predetermined sterilization temperature of the liquid food not only when the liquid is fed but also when the liquid is stopped. As a result, it is recognized that all liquid food that has passed through the plate heat exchanger has been sterilized, and there is no risk of misunderstanding that unsterilized liquid food was sent to the next process as in the past, and quality control is possible. It is possible to reliably prevent the occurrence of confusion.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a plate heat exchanger according to the present invention, and FIG. 2 is a sectional view of an essential part showing another concrete example of a tubular body. FIG. 3 is a block diagram showing an example of a sterilizing apparatus using a plate heat exchanger, and FIG. 4 is a sectional view showing a main part of a conventional plate heat exchanger. (2) …… Aperture, (3) …… Heat transfer plate, (5) ……
Heated path, (6) …… heat receiving path, (8) …… tube, (2
0) …… Plate heat exchanger, (22) …… Main body, (23)
... Temperature sensors.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A plurality of heat transfer plates having openings on a heat transfer surface are laminated to alternately arrange a heating path and a heat receiving path,
Further, a liquid passage hole is formed by a concentric opening communicating with the heat receiving path, and a pipe for liquid outflow provided with a temperature measuring element is provided on the heat transfer plate at the outer end of the heat transfer plate. In a plate-type heat exchanger mounted in communication with a hole, the temperature measuring element is hermetically penetrated and fixed to a pipe body, and a rod-shaped main body having a tip portion inserted into a liquid passage hole and a tip of the main body. A plate heat exchanger, comprising: a temperature sensor attached to a portion of the plate;