JPH0126474B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas condensing device.

A conventional device of this type will be explained. Conventionally, a cold generator and a thermally frozen condensing section were installed in the gas to be condensed, and the gas to be condensed was forced into contact with the condensing section using a device such as a fan, or the gas was Heat exchange was performed by installing a condensing section in the flow.
However, it is disadvantageous to install devices that require mechanical or electrical power, such as fans, and may not be structurally possible.
Alternatively, when there is no gas flow, a condensing section with a large condensing capacity is simply installed in the gas. An example is shown in FIG. In the figure, 1 is a condensation tank, 1a is a gas phase portion of the gas to be condensed and liquefied, 1b is a liquid phase portion, and 2 is thermally connected to a cold generator (not shown) (in this case,
This is the condensing section (through which the refrigerant fluid flows).

By bringing the gas to be condensed and liquefied into contact with a cold generation part (not shown) and the thermally frozen condensing part 2, the condensing part 2 and the gas exchange heat through condensation heat transfer, and the gas is liquefied.

When the gas is simply brought into contact with the condensing section 2 as shown in FIG. 1, the gas comes into contact with the condensing section 2, thereby exchanging heat through condensation heat transfer, and condensing and liquefying the gas. Heat exchange at this time is based on natural convection, which has poor heat exchange characteristics compared to forced convection. In addition, a liquid film is formed in the condensing part 2, making it impossible for gas to directly contact the condensing part 2, and this liquid film becomes a thermal resistance, resulting in a deterioration of heat exchange characteristics. Therefore, in order to improve the heat exchange characteristics, gas is forced to flow into the condensing section, and forced convection improves the heat exchange characteristics.Also, forced convection removes the liquid film and brings the gas into direct contact with the condensing section 2 for heat exchange. In order to improve the characteristics, methods have been used such as generating forced convection with a blower such as a fan or placing the condensing section 2 in the flowing gas. However, if such a method is not possible or disadvantageous, for example, when it is desired to liquefy helium in a container using a condenser, the condensation temperature is extremely low at -269°C, so a fan, etc. The drawback is that it is difficult and expensive to install.

This invention is intended to eliminate the above-mentioned drawbacks, and includes at least one set of fluid inlets and fluid outlets in the condensing section, and the chimney effect (the chimney effect here refers to the pressure difference between the inside and outside of the chimney). This refers to the phenomenon in which gas from outside the chimney is drawn into the chimney by air (hereinafter the same applies).By installing a convection structure, such as a cylindrical structure, to create forced convection, better heat exchange characteristics can be achieved. The object of the present invention is to provide a gas condensing device having the following features.

An embodiment of the present invention will be described below.
It covers a condensing section 2 which is thermally connected to a cold generation device (not shown in FIG. 2) (in this case, a fluid serving as a refrigerant is flowing therethrough), and has at least one set of fluid inlets 4 at its upper and lower parts. In this configuration, a convection structure 3 having a fluid outlet 5 and a chimney effect is installed using an appropriate mounting jig and method. The convection structure 3 may have any shape as long as it has a chimney effect that induces forced convection. For example, as shown in the figure, the shape may be a cylindrical portion with a converging portion 6 attached to the lower part, or the cylindrical portion alone may be used. The shape, size, number, etc. of the fluid inlet 4 and fluid outlet 5 may be arbitrary.
Further, this convection structure 3 may be attached to the condensing section 2 or to another object, such as the condensing tank 1, etc., and when attached, it is necessary to thermally insulate it from the condensing section 2 or the condensing tank 1, etc. It doesn't have to be done or not.

With the configuration as described above, the gas in the gas phase portion 1a that comes into contact with the condensing portion 2 which is thermally connected to a cold generation device (not shown) exchanges heat through condensation heat transfer. , it becomes a cooler gas and falls, or it liquefies and falls. At this time, a pressure difference is created between the inside and outside of the convection structure 3, and gas is drawn into the interior through the fluid inlet 4 due to the chimney effect. At this time, the flow created by the gas being drawn into the convection structure 3
The presence of this convection causes the flow to become constricted, resulting in a flow that is faster than normal natural convection, resulting in a flow that can be considered forced convection. Therefore, a forced flow is generated around the condensing section 2, and this forced convection improves the heat exchange characteristics between the condensing section 2 and the gas. Furthermore, if a liquid film forms in the condensing section 2, forced convection acts to remove it, resulting in very good heat exchange characteristics.

In addition to the embodiments described above, various shapes can be considered, for example, as shown in FIGS. 3 and 4. In other words, the above applies to all gas condensing devices equipped with a convection structure that uses the chimney effect to induce fluid flow, rather than using a mechanically or electrically powered blower mechanism. applicable.

According to the present invention, good heat exchange characteristics can be obtained by applying the present invention to cases where it is impossible or disadvantageous to install a mechanically or electrically powered air blowing mechanism. Furthermore, compared to the conventional method, the device can be made more compact and inexpensive when considering the blower mechanism.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a conventional gas condensing device, FIG. 2 is a cross-sectional side view showing a gas condensing device according to an embodiment of the present invention, and FIGS. 3 and 4 are respective examples of other embodiments. FIG. In the figure, 1 is a condensation tank, 1a is a gas phase part, 1b is a liquid phase part, 2 is a condensation part, 3 is a convection structure, 4 is a fluid inlet, 5 is a fluid outlet, and 6 is a constriction part. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A gas condensing device in which a condensing section is disposed in a gas phase portion of a condensing tank, characterized in that a convection structure covering the condensing section is provided. 2. The gas condensing device according to claim 1, wherein at least one set of a fluid inlet and a fluid outlet are provided at the upper and lower parts of the convection structure.