JP4036670B2 - Heat transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat transfer device that can reliably perform gas-liquid separation of a heat transfer medium returned from a heat utilization device.
[0002]
[Prior art]
The Stirling refrigerator has many excellent features such as being able to be miniaturized, having a high coefficient of performance and refrigeration efficiency, a wide range of generated temperatures, and being able to easily replace chlorofluorocarbons in recent global environmental problems.
[0003]
And the cold heat which generate | occur | produced in this Stirling refrigerator is conveyed and utilized by cold heat utilization apparatus with a heat conveying apparatus.
[0004]
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.5 has shown the connection part of piping.
[0005]
This heat transfer device includes a cold heat source side heat exchanger 110 that exchanges heat between a cold heat source and a heat transfer medium such as a Stirling refrigerator, a transfer pump 111 that pumps the heat transfer medium, a heat transfer medium and a cold heat utilization device, A heat exchanger (not shown) that exchanges heat, a gas-liquid separator 112 that performs gas-liquid separation so that only the liquid heat transfer medium is supplied to the transfer pump 111, a tank 113 that stores excess heat transfer medium, and the like. The main structure.
[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 the cold transfer unit 101.
[0007]
As a result, the heat transfer medium returned from the cold energy utilization device flows into the unit from the inlet pipe 121 of the cold heat conveyance unit 101 and uses the cold heat from the outlet pipe 122 via the conveyance pump 111 and the cold heat source side heat exchanger 110. Supplied to the equipment.
[0008]
At this time, if a gas component is included in the heat transfer medium that has returned to the cold heat transfer unit 101, it is difficult to efficiently perform heat exchange with the cold heat source, and the heat transfer efficiency is lowered. The heat transfer medium is gas-liquid separated by the gas-liquid separator 112 so that only the liquid heat transfer medium circulates in the circulation path.
[0009]
Such a gas-liquid separator 112 includes a separation pipe 123 arranged in a vertical direction, and an inlet pipe 121 is connected (point b) in the vicinity of the lower end of the separation pipe 123, whereby the inlet pipe Of the heat transfer medium returned through 121, the gaseous heat transfer medium floats in the separation tube 123 (double-pointed arrow) and accumulates in the U-shaped portion (point c) of the separation tube 123. Further, the liquid heat transfer medium flows down toward the lower end of the separation tube 123 (double solid arrow). Thereby, gas-liquid separation is performed.
[0010]
In the tank 113, the top end of the separation pipe 123 is connected to the top, and the gas or liquid overflowing at the point c of the separation pipe 123 flows from the head (point e) of the tank 113 and is stored.
[0011]
In addition, the top end of the separation pipe 123 is connected to a circulation line pipe connecting the lower end of the separation pipe 123 and the transport pump 111 at the point r.
[0012]
[Problems to be solved by the invention]
However, in the above configuration, when the circulation amount of the heat transfer medium is increased, there is a problem that a large amount of the liquid heat transfer medium enters the separation pipe 123 and gas-liquid separation cannot be normally performed.
[0013]
That is, there is a demand for a long distance between the gas-liquid separation point (point b) in the separation pipe 123 and the connection portion (point r) of the liquid return pipe 124 and downsizing of the cooling / heating transport unit 101. Since there are a plurality of bent portions (bent portions of the piping) between them, a large pressure loss occurs between the gas-liquid separation point (point b) and the connection portion (point r) of the liquid return pipe 124.
[0014]
When the circulation amount of the heat transfer medium is increased in a state where such pressure loss occurs, the gas-liquid separation point (point c) and the connection portion (point r) of the liquid return pipe 124 are increased with the increase of the circulation amount. The differential pressure increases.
[0015]
As a result, the pressure at the connecting portion (point r) decreases, the point c of the separation pipe 123 on the opposite side becomes low, the liquid heat transfer medium is sucked up, and enters the top of the separation pipe 123. Occurs.
[0016]
In view of the above, an object of the present invention is to provide a heat transfer device that can normally perform gas-liquid separation even when the circulation amount of the heat transfer medium is increased.
[0017]
[Means for Solving the Problems]
In order to solve the above problems, the present invention includes a cold heat source side heat exchanger that exchanges heat between a heat transfer medium and a cold heat source, and a transfer pump that pumps the heat transfer medium to the heat utilization device side. These are connected in order by a circulation pipe and unitized as a cold transfer unit, and the heat transfer medium returned from the heat utilization device enters the cold transfer unit, and the heat transfer medium is used as the heat utilization device. In the heat transfer device including the outlet pipe to be supplied, the separation pipe arranged in the vertical direction is provided, and the inlet pipe is connected orthogonally to the vicinity of the lower end portion of the separation pipe so that the inlet pipe passes through the inlet pipe. A gas-liquid separator that performs gas-liquid separation by allowing gas to rise inside the separation tube and flowing down toward the lower end of the separation tube and bending the top of the upper end of the separation tube is returned. And then split into a first end and a second end The recovery pipe from the discharge side of the circulation path pipe pump by connecting the lower connecting the first end to the top of the tank for storing the heat-carrying medium, with connecting the second end in the vicinity of the lower end of the separation pipe, tank And a conduit that guides the heat transfer medium of the liquid to a circulation line pipe on the input side of the transfer pump through a purification filter.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit diagram of a cooling and conveying unit 1 applied to the description of the embodiment of the present invention, and FIG. 2 is a three-dimensional schematic diagram thereof.
[0019]
This heat transfer device includes a cold heat source side heat exchanger 10 for exchanging heat between a cold heat source and a heat transfer medium such as a Stirling refrigerator, a transfer pump 11 for pumping the heat transfer medium, a heat transfer medium and a device for using cold heat, A heat exchanger that exchanges heat, a gas-liquid separator 12 that performs gas-liquid separation so that only the liquid heat transfer medium is supplied to the transfer pump 11, a tank 13 that stores excess heat transfer medium, and the tank 13 The filter 14 and the like that are cleaned and returned when the liquid heat transfer medium stored in is returned to the circuit are the main components.
[0020]
Then, the cold heat source side heat exchanger 10, the transfer pump 11, the gas-liquid separator 12, the tank 13, the filter 14, and the like are unitized as the cold heat transfer unit 1, and the cold heat transfer unit 1 returns from the cold energy utilization device. An inlet pipe 21 through which the heat transfer medium returns to the unit, and an outlet pipe 22 that is supplied to the cold energy utilization device via the transfer pump 11 and the cold heat source side heat exchanger 10 are provided.
[0021]
The tank 13 is disposed above the filter 14 because of a request for downsizing of the cold transfer unit 1 and the liquid heat transfer medium stored in the tank 13 flows down through the pipe 29 by the action of gravity. Is supplied to the filter 14, purified by the filter 14, joined to the liquid return pipe 24 at the point f, and then returned to the circulation pipe.
[0022]
The gas-liquid separator 12 is formed by a separation pipe 23 arranged in a vertical direction, and an inlet pipe 21 is orthogonally connected to the vicinity of the lower end of the separation pipe 23 (point b), and the lower end (point g). Is connected to a circulation pipe connected to the transport pump 11. The inlet pipe 21 and the outlet pipe 22 are provided in the horizontal direction.
[0023]
The separation tube 23 is bent back by forming the top end of a substantially U shape, a substantially U shape, a substantially V shape, etc., and divided into a first end and a second end at the upper end d point. Is connected to a part of the tank 13 through a point e. The second end is connected to the lower end (point g) via the liquid return pipe 24. This connection may be in the vicinity of the lower end (point g).
[0024]
As a result, of the heat transfer medium that has returned to the cold transfer unit 1 via the inlet pipe 21, the gaseous heat transfer medium floats in the pipe toward the top of the separation pipe 23 (point c direction), and the heat of the liquid. The carrier medium is downstream (in the direction of the point g) and gas-liquid separation is performed.
[0025]
When the amount of the heat transfer medium of the gas that has floated in the separation pipe 23 increases, the point e near the top (or the top) may pass through the gas conduit 25 (first end) to the tank 13. Led.
[0026]
Accordingly, the gas heat-transfer medium that has been gas-liquid separated flows into the tank 13 from the top of the tank 13 and is stored therein.
[0027]
A recovery pipe 27 is provided at the bottom of the tank 13, and a circulation path pipe 26 between the transport pump 11 and the cold heat source side heat exchanger 10 is connected via an electromagnetic valve (open / close valve) 28.
[0028]
The electromagnetic valve 28 opens, for example, for 0.1 second to several seconds per minute, and periodically supplies the heat transfer medium discharged from the transfer pump 11 to the fixed amount tank 13.
[0029]
The heat transfer medium supplied to the tank 13 reaches the filter 14 via the pipe 29 connected to the bottom n point of the tank 13 and is purified, and then returns to the circulation line pipe through the point f of the liquid return pipe 24. It is.
[0030]
The filter 14 can be replaced by closing the on-off valves V1 to V3.
[0031]
By providing the connection part (point g) of the liquid return pipe 24 at the connection part (point b) of the inlet pipe in this way, a large pressure loss occurs due to the presence of a plurality of bent portions in the subsequent circulation line piping. Even in such a system, there is almost no pressure loss between the connection part (point g) of the liquid return pipe 24 and the connection part (point b) of the inlet pipe, so that the circulation amount of the heat transfer medium is increased. However, the point c of the separation tube 23 does not become an extremely low pressure, and it is possible to prevent a situation where the liquid heat transfer medium rises in a large amount through the separation tube 23 and the gas-liquid separation action is not hindered. .
[0032]
The tank 13 is provided with a trap portion and a pressure relief device when the inside of the tank 13 becomes high pressure through the point q, and a heat transfer medium injection mechanism is provided at the point p.
[0033]
FIG. 3 is a diagram showing the liquid column difference between the conventional structure shown in FIGS. 4 and 5 and the structure according to the present invention shown in FIGS. 1 and 2 with respect to the flow rate of the heat transfer medium.
[0034]
The liquid column difference is a difference in the liquid column in the amount of the heat transfer medium of the liquid stored in the separation tube 23 and the liquid return tube 24. This liquid column difference is due to the installation structure of the tank 13 and the filter 14. Must be within 30 cm.
[0035]
As can be seen from this figure, in the case of the conventional configuration in FIG. 3 and the like, a plurality of bent portions (w1 to w4) exist between the separation pipe 23 and the liquid return pipe 24, so that the flow rate is 3 At liters / minute, the liquid column difference exceeds 30 cm, but according to the configuration of the present invention, there is no bent portion between them, so that it can be accommodated in about 10 cm.
[0036]
【The invention's effect】
As described above, according to the present invention, the separation pipe arranged in the vertical direction is provided, and the inlet pipe is orthogonally connected in the vicinity of the lower end portion of the separation pipe. Of the returned heat transfer medium, gas floats in the separation tube, and a gas-liquid separator is provided to perform gas-liquid separation by flowing down the liquid toward the lower end of the separation tube, and the top of the upper end of the separation tube is bent back. After that, it is divided into a first end and a second end, the first end is connected to the upper part of the tank for storing the heat transfer medium by connecting the recovery pipe from the circulation line pipe on the discharge side of the transfer pump to the lower part , Since the second end is connected to the vicinity of the lower end of the separation pipe, and a pipe for guiding the heat transfer medium of the liquid in the tank to the circulation line pipe on the input side of the transfer pump through the purification filter is provided. Even if the circulation rate of the medium is increased, the gas-liquid separation can be performed normally and the reliability is improved. .
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a cooling and conveying unit applied to the description of an embodiment of the present invention.
FIG. 2 is a three-dimensional schematic diagram of a cold heat transfer 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 cooling / heating transport unit applied to the description of a conventional technique.
FIG. 5 is a three-dimensional schematic diagram of the cold transfer unit of FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cold transfer unit 12 Gas-liquid separator 22 Outlet pipe 23 Separation pipe 24 Liquid return pipe 25 Gas conduit pipe 26 Circulation path pipe 27 Recovery pipe 28 Solenoid valve 29 Connection pipe 31 Transport pump 32 Tank 35 Inlet pipe 39 Filter

Claims (1)

A heat source side heat exchanger that exchanges heat between the heat transfer medium and the cold heat source, and a transfer pump that pumps the heat transfer medium to the heat utilization device side, and these are sequentially connected by a circulation line pipe An inlet pipe that is connected and unitized as a cold transfer unit and the heat transfer medium returned from the heat utilization device enters the cold heat transfer unit, and an outlet tube that supplies the heat transfer medium to the heat utilization device In the heat transfer device provided,
A separation pipe arranged in the vertical direction is provided, and the inlet pipe is connected orthogonally to the vicinity of the lower end of the separation pipe, so that the gas in the heat transfer medium returned through the inlet pipe A gas-liquid separator is provided that floats in the separation tube and flows down in the separation tube toward the lower end to perform gas-liquid separation. After bending the top of the upper end of the separation tube back, the first end and the first end The first end is connected to the upper part of the tank for storing the heat transfer medium by connecting the recovery pipe to the lower part from the circulation line pipe on the discharge side of the transfer pump, and the second end is connected to the end of the transfer pump. A heat transfer device connected to the vicinity of the lower end of the separation pipe and having a pipe for guiding the heat transfer medium of the liquid in the tank to a circulation pipe on the input side of the transfer pump through a purification filter .

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