JP2003307377A - Heat transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To normally perform steam separation even if increasing a circulating amount of a heat transfer medium. <P>SOLUTION: When the liquid heat transfer medium stored in a tank 13 is purified and returned to a circulating passage via a liquid return pipe 24, the lower end (g point) of the liquid return pipe 24 is made to approach and connected to a connecting part (b point) of an inlet pipe 21. Even if a system produces a large pressure loss from the lower end (g point) of the return pipe 24 to a transfer pump, this constitution scarcely produce the pressure loss between the connecting part (g point) of the liquid return pipe 24 and the connecting part (b point) of the inlet pipe 21, so that if the circulation amount of the heat transfer medium is increased, this constitution can prevent the intrusion of a large amount of the liquid heat transfer medium into the separation pipe 23 so as to appropriately perform the steam separation. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device which can surely perform gas-liquid separation of a heat transfer medium returned from heat utilization equipment. [0002] Stirling refrigerators can be miniaturized.
High coefficient of performance and refrigeration efficiency, wide temperature range to generate,
It has many excellent features such as easy replacement of CFCs in global environmental problems in recent years. [0003] The cold generated by the Stirling refrigerator is conveyed to a cold utilization device by a heat transfer device and used. FIG. 4 is a circuit diagram of a cold-heat supply portion (cold-heat transfer unit 101) of the heat transfer device, and FIG. 5 is a three-dimensional schematic diagram thereof. In addition, a, b, ... in FIG. 4 and FIG.
Indicates a pipe connection part. The heat transfer apparatus includes a cold heat source side heat exchanger 110 for exchanging heat between a cold heat source such as a Stirling refrigerator and a heat transfer medium, and a transfer pump 11 for pressure-feeding the heat transfer medium.
1. Load-side heat exchanger (not shown) for exchanging heat between the heat transfer medium and the cold heat utilizing equipment, and a gas-liquid separator 11 for separating gas and liquid so that only the liquid heat transfer medium is supplied to the transfer pump 111
2. The main structure is a tank 113 for storing an excess heat transfer medium. [0006] The cold heat source side heat exchanger 110, the transfer pump 111, the gas-liquid separator 112, the tank 113, and the like are unitized as a cold heat transfer unit 101. [0007] As a result, the heat transfer medium returned from the cold heat utilization device flows into the cold transfer unit 101 from the inlet pipe 121 into the unit and passes through the transfer pump 111 and the cold heat source side heat exchanger 110 to the outlet pipe 122. Is supplied to the cold heat utilization equipment. At this time, if a gas component is contained in the heat transfer medium returned to the cold transfer unit 101, it is difficult to efficiently perform heat exchange in the cold heat source, and the cold transfer efficiency is reduced. Then, the returned heat transport medium is gas-liquid separated by the gas-liquid separator 112 so that only the liquid heat transport medium circulates in the circulation path. Such a gas-liquid separator 112 has a separation pipe 123 disposed in a vertical direction, and an inlet pipe 121 is connected near the lower end of the separation pipe 123 (point b). The gaseous heat transfer medium of the heat transfer medium returned via the inlet pipe 121 floats in the separation pipe 123 (double point arrow) and accumulates in the U-shaped portion (point c) of the separation pipe 123. . Further, the liquid heat transfer medium flows down (double solid line arrow) toward the lower end of the separation tube 123. Thereby, gas-liquid separation is performed. In the tank 113, the top end of the separation tube 123 is connected to the upper portion, and gas or liquid overflowing at the point c of the separation tube 123 flows from the head (point e) of the tank 113 and is stored therein. You. The top end of the separation pipe 123 is connected to a circulation pipe connecting the lower end of the separation pipe 123 and the transport pump 111 at a point r. However, in the above configuration, when the circulation amount of the heat transfer medium is increased, a large amount of the liquid heat transfer medium enters the separation tube 123, and the gas-liquid separation is performed normally. There was a problem that a situation where it could not be performed occurred. That is, the gas-liquid separation point (b
(Point r) and the connecting portion (point r) of the liquid return pipe 124, and there is a demand for downsizing the cold and heat transfer unit 101, and a plurality of bent portions (bent portions of the pipe) are required during this time. Is present, a large pressure loss occurs between the gas-liquid separation point (point b) and the connection part of the liquid return pipe 124 (point r). If the circulation amount of the heat transfer medium is increased in a state where such a pressure loss occurs, the connection portion (r) between the gas-liquid separation point (point c) and the liquid return pipe 124 is increased with the increase in the circulation amount.
Point) and the pressure difference increases. As a result, the pressure at the connection portion (point r) decreases, and the pressure at the point c of the separation tube 123 on the opposite side becomes low, so that the liquid heat transfer medium is sucked up and enters the top of the separation tube 123. Situation occurs. SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat transfer apparatus capable of performing normal gas-liquid separation even if the circulation amount of the heat transfer medium is increased. [0017] In order to solve the above-mentioned problems, the present invention provides a heat source side heat exchanger for exchanging heat between a heat transfer medium and a cold heat source, and the heat transfer medium. And a transfer pump for pressure-feeding the heat to the heat utilization device side, these are sequentially connected by a circulation path pipe to form a unit as a cold heat transfer unit, and the heat transfer medium returned from the heat use device enters the cold heat transfer unit. In a heat transfer device including an inlet pipe and an outlet pipe that supplies a cold and heat transfer unit to heat utilization equipment, the heat transfer apparatus includes a separation pipe disposed in a vertical direction, and the inlet pipe is orthogonal to a vicinity of a lower end portion of the separation pipe. By being connected
Among the heat transfer medium returned via the inlet pipe, a gas floats in the separation pipe, and a gas-liquid separator is provided in which liquid flows down to the lower end of the separation pipe toward the lower end to perform gas-liquid separation. After bending back the top end, it is divided into a first end and a second end,
A first end is connected to an upper part of a tank which is connected to a circulation path pipe on a discharge side of the transfer pump from a lower part and stores the heat transfer medium,
A second end connected to the vicinity of the lower end of the separation pipe, and a conduit for guiding a liquid heat transfer medium in the tank to a circulation pipe on an input side of the transfer pump through a purification filter. . Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a cold and hot transfer unit 1 applied to the description of an embodiment of the present invention, and FIG. 2 is a three-dimensional schematic diagram thereof. This heat transfer device includes a cold heat source side heat exchanger 10 such as a Stirling refrigerator for exchanging heat between a cold heat source and a heat transfer medium, a transfer pump 11 for pumping the heat transfer medium, a heat transfer medium and a cold heat transfer medium. A load-side heat exchanger that exchanges heat with the utilization equipment, a gas-liquid separator 12 that separates gas and liquid so that only the liquid heat transfer medium is supplied to the transfer pump 11, a tank 13 that stores excess heat transfer medium, When returning the liquid heat transfer medium stored in the tank 13 to the circuit, a filter 14 and the like for cleaning and returning the liquid heat transfer medium are mainly used. The heat source-side heat exchanger 10, the transport pump 11, the gas-liquid separator 12, the tank 13, and the filter 14
And the like are unitized as the cold and heat transfer unit 1, and the cold and heat transfer unit 1 has an inlet pipe 21 for returning the heat transfer medium returned from the cold utilization device into the unit, a transfer pump 11, and a cold and heat source side heat exchanger 10. And an outlet pipe 22 that is supplied to the cold heat utilization device through the outlet pipe 22. The tank 13 is disposed above the filter 14 in order to reduce the size of the cold and heat transfer unit 1 and the like, and the liquid heat transfer medium stored in the tank 13 passes through the pipe 29 by the action of gravity. And is supplied to the filter 14, purified by the filter 14, and supplied to the liquid return pipe 24.
After merging at the point, it returns to the circulation pipe. The gas-liquid separator 12 is formed by a separation pipe 23 disposed in a vertical direction, and an inlet pipe 21 is connected to the vicinity of the lower end of the separation pipe 23 orthogonally (point b). g
The point () is connected to a circulation pipe connected to the transport pump 11. In addition, the inlet pipe 21 and the outlet pipe 22 are provided in the horizontal direction. The upper end of the separation tube 23 is substantially U-shaped, substantially U-shaped,
A top having a substantially V-shape or the like is formed and bent back, and the upper end is divided into a first end and a second end at point d, and the first end is connected to a part of the tank 13 via point e. I have. The second end is connected to the lower end (point g) via a liquid return pipe 24. This connection may be near the lower end (point g). As a result, the gaseous heat transfer medium of the heat transfer medium returning to the cold and heat transfer unit 1 via the inlet pipe 21 floats in the pipe toward the top of the separation pipe 23 (in the direction of point c). The liquid heat transfer medium is downstream (in the direction of point g) to perform gas-liquid separation. When the amount of the heat transfer medium of the gas floating in the separation pipe 23 increases, the gas flows from the point e near the top (or the top) through the gas conduit 25 (first end). It is led to the tank 13. Accordingly, the gaseous heat transfer medium separated into gas and liquid flows into the tank 13 from the top of the tank 13 and is stored therein. A recovery pipe 27 is provided at the bottom of the tank 13, and a circulation pipe 26 between the transfer pump 11 and the heat source-side heat exchanger 10 is connected via an electromagnetic valve (open / close valve) 28. I have. The solenoid valve 28 is operated, for example, at 0.1
It opens for a few seconds to several seconds, and supplies a constant amount of the heat transfer medium discharged from the transfer pump 11 to the tank 13. The heat transfer medium supplied to the tank 13 reaches the filter 14 via a pipe 29 connected to the bottom point n of the tank 13 and is purified. Returned to piping. The filter 14 can be replaced by closing the on-off valves V1 to V3. By providing the connection part (point g) of the liquid return pipe 24 at the connection part (point b) of the inlet pipe as described above, a plurality of bent parts are present in the subsequent circulating pipe so that a large pressure loss occurs. Is generated, almost no pressure loss occurs between the connection part (point g) of the liquid return pipe 24 and the connection part (point b) of the inlet pipe. Even if the temperature is increased, the point c of the separation tube 23 does not become an extremely low pressure, a situation in which the liquid heat transfer medium rises a large amount in the separation tube 23 can be prevented, and the gas-liquid separation action is hindered. Is lost. The tank 13 is provided with a trap portion and a pressure relief device when the inside of the tank 13 becomes high pressure via the point q, and a heat transfer medium injection mechanism is provided at the point p. FIG. 3 shows the conventional structure shown in FIGS. 4 and 5,
FIG. 3 is a diagram showing a liquid column difference in the structure according to the present invention shown in FIGS. 1 and 2 with respect to a flow rate of a heat transfer medium. The difference between the liquid columns means the separation pipe 23 and the liquid return pipe 24.
Means the difference between the liquid columns in the amount of the heat transfer medium of the liquid stored in the pipe, and this liquid column difference must be within 30 cm from the installation structure of the tank 13 and the filter 14. As can be seen from the figure, in the case of the conventional configuration shown in FIG. 3 and the like, since a plurality of bent portions (w1 to w4) exist between the separation pipe 23 and the liquid return pipe 24, When the flow rate is 3 liters / minute, the liquid column difference exceeds 30 cm. However, according to the configuration of the present invention, since there is no bent portion between them, it is possible to fit in about 10 cm. As described above, according to the present invention, the separation pipe is provided in the vertical direction, and the inlet pipe is orthogonally connected near the lower end of the separation pipe. Thereby, a gas of the heat transfer medium returned via the inlet pipe floats in the separation pipe, and a gas-liquid separator for performing liquid-gas separation by flowing liquid toward the lower end in the separation pipe is provided. After the top of the pipe is bent back, it is divided into a first end and a second end, and the first end is connected to the circulation path piping on the discharge side of the transfer pump from the bottom and the upper part of the tank for storing the heat transfer medium. And a second end connected to the vicinity of the lower end of the separation pipe, and a pipe for guiding the liquid heat transfer medium in the tank to a circulation pipe on the input side of the transfer pump via a purification filter. Therefore, gas-liquid separation can be performed normally even if the circulation amount of the heat transfer medium is increased. Reliability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a cold and heat transfer unit applied to an embodiment of the present invention. FIG. 2 is a three-dimensional schematic view of the cold and hot transport unit. FIG. 3 is a diagram showing a liquid column difference between a conventional structure and a structure according to the present invention with respect to a flow rate of a heat transfer medium. FIG. 4 is a circuit diagram of a cold and heat transfer unit applied to the description of the related art. FIG. 5 is a schematic three-dimensional view of the cold and heat transfer unit of FIG. 4; [Description of Signs] 1 Cold and hot transfer unit 12 Gas-liquid separator 22 Outlet pipe 23 Separator pipe 24 Liquid return pipe 25 Gas conduit pipe 26 Circulation pipe pipe 27 Recovery pipe 28 Solenoid valve 29 Connection pipe 31 Transport pump 32 Tank 35 Inlet pipe 39 Filter

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Hiroshi Sekiya             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Masataka Hatta             TBS release at 5-3-6 Akasaka, Minato-ku, Tokyo             Transmission Center Tokyo Electron Limited F term (reference) 3L044 AA04 DB02 KA01 KA05

Claims (1)

Claims: 1. A heat source side heat exchanger for exchanging heat between a heat transfer medium and a cold heat source, and a transfer pump for pressure-feeding the heat transfer medium to a heat utilization device side. Having an inlet pipe into which the heat transfer medium returned from the heat utilization device enters the cold heat transfer unit, and a cold transfer unit, An outlet pipe for supplying heat to the heat utilization device, wherein the heat pipe includes a vertically separated separation pipe, and the inlet pipe is orthogonally connected near a lower end of the separation pipe. ,
A gas-liquid separator for performing gas-liquid separation in which a gas of the heat transfer medium returned via the inlet pipe floats in the separation pipe, and a liquid flows down the separation pipe toward a lower end thereof to perform gas-liquid separation; After the top of the pipe is bent back, the pipe is divided into a first end and a second end. And a second end connected near the lower end of the separation pipe, and a pipe that guides the liquid heat transfer medium in the tank to a circulation path pipe on the input side of the transfer pump through a purification filter. A heat transfer device having a path.