JPS5935762A - Condenser - 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 is useful for heating tap water using a refrigerant condenser, such as in a heat pump water heater, or for heating and keeping food warm. This invention relates to a condenser designed to prevent contamination with tap water, food, etc.

The structure of the conventional example and its problems The external view of the conventional water-cooled condenser is shown in Fig. 4 and Fig. 6.
The main types of heat exchangers were double-tube heat exchangers as shown in the cross-sectional view of the figure, and shell-and-keave heat exchangers (not shown).
In applications used for hot water supply, such as the field of application of the present invention, the above-mentioned two-layer heat exchanger and shell-and-cube heat exchanger are reliable in preventing the mixing of refrigerant and lubricating oil with hot water supply. Since the above is not satisfied, heat exchangers with a safe configuration include a triple-tube heat exchanger with a double-walled inner tube as shown in the cross-sectional view of Fig. A side-by-side double wall heat exchanger was used. However, in both configurations, tube materials are used, so due to the limitations of the basic structure of the tube materials, the heat transfer area can be increased in density, and the heat exchanger itself can be made smaller and lighter in size to save resources. That was difficult.

In particular, if there is no forced circulation on the water side, for example, in a configuration where the condenser is buried in the hot water storage tank, it is necessary to expand the heat transfer area to compensate for the decrease in the heat transfer coefficient on the water side.
Since long air traffic control systems were to be used, there was a strong demand for lighter and more compact systems.

Purpose of the Invention The present invention is intended to solve these conventional problems, and aims to make the condenser compact and high-performance by enlarging the heat transfer tube densely and improving the heat transfer coefficient on the refrigerant side. be.

Structure of the Invention In order to achieve this object, the present invention provides an outer cylinder having first annular heat transfer fins fixed to the outer surface thereof, and an outer cylinder having second annular heat transfer fins fixed to the inner surface thereof. A fluid conduit portion is provided at the central axis side end of the second annular heat transfer fin, and an outflow pipe for refrigerant gas discharged from the compressor is provided at one end side of the fluid conduit portion. A condensed refrigerant liquid outflow hole is provided near the tip of the outflow pipe, and the fluid conduit section is connected to the gas/liquid 2.
The fluid is brought into a phase state, and the fluid is caused to flow into the second annular inter-fin flow path from the other end side of the fluid conduit to form the first ambiguous flow path.

With this configuration, heat transfer fins are densely provided on both sides of the outer and inner cylinders that make up the double-walled heat transfer cylinder, increasing the heat transfer area, and the refrigerant gas flowing out to the condenser is condensed by the suction effect. It works by sucking the refrigerant liquid and creating a gas-liquid two-phase state in the fluid conduit section, so it removes the gas region with low heat transfer coefficient and transfers the gas-liquid two-phase state with high heat transfer coefficient through the heat transfer tube. A device that obtains a heat exchange effect, and has an effect as a high-performance compact condenser due to the mutual effect of the expansion effect of the high-density heat transfer area and the expansion effect of the two-phase heat exchange area with a high heat transfer coefficient. It is.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained using FIGS. 1, 2, and 3. FIG. 1 shows an embodiment in which a condenser 1 according to the present invention is attached to the lower part of a hot water storage tank 2.

3 is a water supply pipe, and 4 is a hot water outlet pipe. The condenser 1 is one of the components of a heat pump (not shown), and the case of a heat pump water heater is shown. FIG. 2 is a block diagram of the condenser 1 according to the invention. FIG. 3 is also a longitudinal section. 2nd, 3rd
In the figures, the same members are given the same numbers. 5 is an outer cylinder; 6 is a first annular fin provided on the outer surface of the outer cylinder 1; 7 is a first annular fin provided on the outer surface of the outer cylinder 1;
is an inner cylinder, 8 is a second annular heat transfer fin provided on the inner surface of the inner cylinder 7, and the outer periphery of the inner cylinder 7 is in contact with the inner periphery of the outer cylinder 5. The heat transfer tubes 9 of the two city walls are configured. Therefore, between the fluid flowing between the first annular heat transfer fins 60 provided on the outer surface of the outer cylinder 5 and the refrigerant flowing between the second annular heat transfer fins 8 provided on the inner surface of the inner cylinder 7. , heat is exchanged through the double-walled heat transfer tube 9, and the refrigerant is cooled and liquefied. Furthermore, a fluid conduit portion 1 is provided at the end of the second annular heat transfer fin 8 on the central axis side.
One end of this fluid conduit section 10 is provided with an outflow pipe 11 for the refrigerant gas discharged from the compressor (not shown), and a condensed refrigerant liquid is provided near the tip of this outflow pipe 11. An outflow hole 12 is provided. That is, due to the suction effect when the refrigerant gas discharged from the compressor flows out from the outflow pipe 11 to the fluid conduit section 10, the condensed refrigerant liquid flows between the second annular heat transfer fins 8 provided in the inner cylinder 7. A part of the outflow hole 12
In order to draw more suction, the inside of the fluid conduit portion 1o immediately enters a two-phase gas-liquid state. This gas-liquid two-phase refrigerant flows from the other end of the fluid conduit section 1Q into between the second annular heat transfer fins 8 of the inner cylinder 7, thereby exchanging heat through the heat transfer cylinder 9. In this region, there is no heat exchange in the gas region, but heat exchange between the gas-liquid two-phase state and the liquid phase region after condensation and liquefaction. In this way, in the heat exchange heat transfer surface, instead of a heat exchange region in a gas region with a low heat transfer coefficient, a heat exchange heat transfer surface is configured in a gas-liquid two-phase region with a high heat transfer coefficient.

Note that 13 is a refrigerant flow hole provided in the second annular heat transfer fin 8, and the refrigerant in the two-phase state is passed through this refrigerant flow hole 13.
While flowing between the second annular heat transfer fins 8 one after another, it is cooled and condensed into a liquefied liquid, and the refrigerant liquid -F114 also leaves the condenser 1. .

Reference numeral 15 is a 7-lunge for attaching and fixing to the hot water tank 2.

Effects of the Invention As described above, the condenser of the present invention provides the following effects.

(1) A heavy-walled heat transfer tube is formed by bringing the outer circumference of the inner tube, which has the second annular heat transfer fins fixed to its inner surface, into contact with the inner circumference of the outer tube, which has the first annular heat transfer fins fixed to its outer surface. Since it is configured, 1
The heat transfer area can be expanded by densely providing heat transfer fins on each of the outer and outer cylinders, and a fluid conduit section is provided in the high-density, small condenser, and compression is carried out at one end of the fluid conduit section. An outflow pipe for the refrigerant gas discharged from the machine is connected, an outflow hole for the condensed refrigerant liquid is provided near the tip of the outflow pipe to bring the fluid conduit section into a gas-liquid two-phase state, and the second Since it is configured to flow into the annular heat transfer fin inter-fin flow path and exchange heat with the first annular heat transfer fin inter-fin fluid,
In terms of heat exchange and heat transfer, it is possible to obtain a condenser that performs high-performance heat exchange by creating a gas-liquid two-phase state region with a high heat transfer coefficient instead of a gaseous heat exchange region with a low heat transfer coefficient. I can do it.

The effect of heat transfer fins densely provided on the inner and outer surfaces of the tube and the effect of promoting heat exchange in the gas-liquid two-phase region by removing the gas region make it possible to create a smaller and lighter condenser compared to conventional tube materials. You can get it.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment using a condenser according to the present invention, FIGS. 2 and 3 are block diagrams of a condenser according to the present invention, and FIG.
5, 6, and 7 show conventional examples. 5... Outer cylinder, 6... First annular heat transfer fin, 7... Inner cylinder, 8... Second annular heat transfer fin, 9...Heat transfer tube, 10...
Fluid conduit section, 11...Outflow pipe, 12...
Outflow hole, 13... Distribution hole, 14... Refrigerant liquid pipe. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] The outer periphery of the inner cylinder having the second annular heat transfer fins fixed to the inner surface is brought into contact with the inner periphery of the outer cylinder having the first annular heat transfer fins fixed to the outer surface to form a two-wall heat transfer cylinder, and A fluid conduit portion is provided at the end of the second annular heat transfer fin on the central axis side, an outflow pipe for the refrigerant gas discharged from the compressor is connected to one end side of the second fluid conduit portion, and a condensing refrigerant is connected near the tip of this outflow pipe. Provide a liquid outflow hole
The liquid in the fluid conduit section is in a two-phase state, and flows into the second annular inter-fin channel from the other end side of the fluid conduit section, and
) 2g of condensation exchanging heat with the fluid between the first annular fins in IJ.