JPS6226472A - Ice melter for cold trap coil in refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ice melting device for a cold trap coil in a brine cooling device such as a vacuum freeze-drying device, a refrigeration device, or a refrigeration facility.

[Conventional technology]

In equipment that operates a refrigerator and cools it with brine, water vapor freezes on the surface of the cold trap coil.
As the frozen ice grows over time, if left untreated, performance will deteriorate.

Particularly in vacuum freeze-drying equipment, large amounts of water vapor generated by sublimation generate heat on the surface of the cold trap coil (
φ is collected as ice on the trap coil,
It is necessary to melt the ice collected in the cold trap,
Shortening this ice melting time is directly related to increasing the production efficiency of vacuum freeze drying equipment, so each company is making efforts to shorten the ice melting time, but the conventional ice melting method is In either case, the ice is melted externally, so there is a limit to how quickly the ice melting time can be shortened, and it requires a long time of 1 to 1.5 hours. This is the current situation.

In other words, Fig. 2 shows a brine system diagram of a cold wire apparatus to which the water sprinkling ice melting method is applied. 1 is a refrigerator, 2 is a cooling brine tank, 3 is a freezer, and 4 is installed in the freezer 3. In normal operation, the cold trap coil is
The cooling brine tank is cooled by the refrigerator 1 by closing the valves V-3 and V-4 and stopping the pump P, opening the valves V-t and V-2 and operating the pump P-+. The cooling brine in 2 is circulated through the cold trap coil 4, and when ice is melted, the pump P-1 is stopped and the valves V-1 and v-2 are closed, and the valve v-3 is closed.
゜After opening V-4 and operating pump P-2, thus emptying the cooling brine in trap coil 4, valve V-s is opened and water sprinkler 5 is activated to inject nozzle 6 into trap coil 4. Spray warm water to melt the ice.

However, such conventional methods have the problem of requiring a long time to melt the ice, as described above.

[Problem that the invention seeks to solve]

The present invention aims to improve the problem of the conventional technology that requires a long time for ice melting as described above, and to provide a cold trap coil ice melting device that can melt ice in a significantly shorter time than the prior art. It is something.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems.

A heating brine device for melting ice is attached to the cooling brine device leading to the cold trap coil, and when melting ice, the heating brine device is switched between the cooling brine device and the heating brine device for ice melting to circulate the heated brine through the trap coil. It is characterized by being configured so that the ice is melted by internal heating of the heated brine.

[Effect]

In the present invention, ice is melted by internal heating rather than from the outside as in the conventional method, so thermal efficiency is significantly improved, and cracks occur in the ice from the inside, making it possible to effectively melt the ice. In particular, when internal heating and conventional water sprinkling ice melting are used together, ice melting can be completed in about 1 hour compared to conventional methods.

〔Example〕

An example of the implementation of the present invention will be described below based on FIG.

FIG. 1 shows a system diagram of a brine in which the present invention is applied to the apparatus shown in FIG.
~Vs, pumps Pt and P-2 are the same as those shown in FIG.

In the present invention, for the apparatus shown in FIG.

An ice-melting heating brine device consisting of a steam or electric heater 7 and an ice-melting heating brine tank 8 heated by the heater is provided. Then, a conduit having a pump PJ and a valve V-6 connects between the inlet side of the trap coil 4, the valve V-1, and the heated brine tank for ice melting, and the trap coil 4
A conduit having a valve V-7 connects between the outlet side of the pump P-2 and the valve V-2 and the heated brine tank 8 for ice melting, and between the pump P-2 and the valve V-4. A return pipe line having a valve V-a is connected to the heating brine tank 8 for melting ice. 2. In addition, in the present invention, as mentioned above, brine is used at both minus temperature and plus temperature, so the brine may be a brine that can be used at both minus temperature and plus temperature, for example.

Use calcium chloride brine, oil brine, glycol brine, etc.

Next, a method of operating the apparatus of the present invention having the above configuration will be explained.

First, during normal operation, pumps P-2 and P-3 are stopped and valves V-3, V-4, V-6, V-7, and V-
8, open valves V-+ and V-2, and pump P.
-+ is driven to circulate cooling brine through the trap coil 4.

Next, when melting ice, as a preparatory step, pump P-1
, PJ is stopped, and valves V-+, V-2, V
-6, V-7, V-11 closed, valves V-3, V-4
At the same time, open the trap coil 4 by operating the pump P-2.
The cooling brine inside is returned to the cooling brine tank 2.

Thus, when the trap coil 4 is empty, the pump P
-1 and P-2, and valve v-1°V-2
, V-3, V-4, V-8 are closed, valves V-6, V-
7 is opened to operate the pump PJ, and the heated brine in the heated brine tank for ice melting is circulated into the trap coil 4. Further, if necessary, the valve V-s is opened and the water sprinkler 5 is driven to spray warm water onto the trap coil 4.

When ice is melted in this way, the ice frozen in the trap coil 4 is effectively heated from the inside by the heated brine circulating in the trap coil 4, causing cracks.
Compared to the conventional method of melting from the outside, ice can be melted in an extremely short time. Incidentally, when the internal heating according to the present invention and the conventional water sprinkling ice melting method were used together, ice melting could be completed in approximately ↓ the time required by the conventional water sprinkling ice melting method.

Next, when the ice melting is completed as described above, pump P-3
At the same time, valves V-6 and V-7 are closed, valves VJ and 18 are opened, pump P-2 is operated, and heated brine in trap coil 4 is transferred to heated brine tank 8 for ice melting.
After the return is completed, normal operation is performed.

〔Effect of the invention〕

As described above, the present invention does not melt ice by heating from the outside as in the conventional method, but melts ice by heating from the inside, so ice melting can be completed in a shorter time compared to conventional methods. Furthermore, when the internal heating of the present invention and external water sprinkling are used together, the time required to complete ice melting can be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a brine to which the present invention is applied, and FIG. 2 is a system diagram of a brine equipped with a conventional water sprinkling ice melting device.

Claims (1)

[Claims] 1. A heating brine device for melting ice is attached to the cooling brine device leading to the trap coil, and when melting ice, switching between the cooling brine device and the heating brine device for ice melting is carried out in the trap coil. 1. An ice melting device for a cold trap coil in a freezing/refrigeration device, characterized in that it is configured to circulate heated brine and melt ice by internal heating. 2. An ice melting device for a cold trap coil in a freezing/refrigeration apparatus according to claim 1, which uses a combination of ice melting by the internal heating and ice melting by water sprinkling from the outside.