JPH0741265U - Heat driven pump - Google Patents

Abstract

(57) [Abstract] [Purpose] In a heat-driven pump, heating and circulation of a working fluid are performed on a large scale and stably by a smooth device by smoothing the generation and disappearance of bubbles. A heating unit (1) in which upper and lower heating pipes (2, 3) heated by a high-temperature fluid from a heat source are arranged, and a heating unit (1) connected to the suction side and the discharge side of the heating pipes and extended upward, and then bent. Working fluid 6 in the working fluid container 5 below through the section
It is provided with an ascending pipe 7 and a descending pipe 8 which reach inside, and check valves 9 and 10 which prevent the backflow of the working fluid 6 in them.
The heating unit 1 has a plurality of heating fluid channels for heating the upper and lower heating tubes 2 and 3 with a high-temperature fluid from a heat source, and cooling for cooling and condensing the bubbles 15 generated in these heating tubes. Fluid channels are alternately arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat-driven pump for heating and transporting a low-temperature working fluid located at a position lower than a high-temperature heat source using the high-temperature heat source, and is used for recovery of various industrial waste heat. It relates to a suitable heat-driven pump.

[0002]

[Prior art]

 In well-known heat-driven pumps that use heat as a driving force, air bubbles are generated in the heating part by heating the working fluid in the heating part, and the generated bubbles disappear after passing through the heating part. Since a pressure change occurs, the working fluid is heated and circulated simultaneously by utilizing this minute pressure change.

However, if this heat-driven pump is applied as it is to a large-scale heat source, a large amount of the above-mentioned bubbles are continuously generated in the heating section, and the bubbles are not condensed. The driving force for sucking the fluid is no longer generated. Therefore, in order to apply the above-mentioned heat-driven pump to a large-scale heat source, it is necessary to use a large number of the heat-driven pumps, which can solve the above-mentioned problems. Will be complicated, resulting in an increase in manufacturing cost and complexity of maintenance.

[0004]

[Problems to be solved by the device]

 The technical problem of the present invention is that, in the above-mentioned heat-driven pump, the generation and disappearance of bubbles are facilitated, so that the driving force for sucking the working fluid is not generated when a large-scale heat source is used. An object of the present invention is to provide a means for solving the problem and capable of stably heating and circulating the working fluid on a large scale and with a simple device.

[0005]

[Means for Solving the Problems]

 The heat-driven pump of the present invention for solving the above-mentioned problems includes a heating unit in which an upper heating pipe and a lower heating pipe, which are heated by a high-temperature fluid from a heat source, are arranged, and a suction side and a discharge of these heating pipes. Prevents backflow of the working fluid in the ascending and descending pipes and the ascending and descending pipes that reach the working fluid in the lower working fluid container via the bent portion after connecting to the side and extending upward. In a heat-driven pump equipped with a check valve, the heating section is provided with a plurality of heating means for heating the upper heating tube and the lower heating tube, and the bubbles generated in these heating tubes are cooled and condensed. It is configured by alternately arranging a plurality of cooling means. In the heat-driven pump, a heat transfer promoting member can be inserted into the heating pipe in the heating section to form a narrow heat transfer promoting gap between the heating pipe wall and the heat transfer promoting member.

[0006]

[Action]

 In the above heat-driven pump, when the heating means supplies the high-temperature fluid from the high-temperature heat source to the high-temperature fluid passage in the heating section, and the high-temperature fluid heats the upper heating tube and the lower heating tube of the heating section, Bubbles are generated in the working fluid flowing in the heating pipe of the. When the pressure in the heating pipe rises due to the generation of the bubbles, the working fluid in the heating pipe returns to the container through the check valve and the downcomer pipe. Also, when the air bubbles generated in this way move in the heating pipe and reach the low temperature fluid flow path, the cooling fluid supplied to the low temperature fluid flow path forcibly cools and condenses the bubbles. Along with this, the pressure in the upper and lower heating pipes decreases, and the suction force sucks the working fluid in the working fluid container through the check valve and the rising pipe. By smoothly repeating the generation and disappearance of bubbles in the heating pipe in this manner, it becomes possible to heat and circulate the working fluid on a large scale and stably with a simple device.

[0007]

【Example】

 1 and 2 show an embodiment of a heat-driven pump according to the present invention. As shown in the figure, this heat-driven pump includes a heating unit 1 in which an upper heating pipe 2 and a lower heating pipe 3 are arranged in parallel in the upper and lower sides, and an upper heating pipe 2 and a lower heating pipe in the heating unit 1. 3 is connected to the suction side of 3 and extends upward, and then reaches the working fluid 6 in the working fluid container 5 below through the bent portion, and the discharge of the upper heating pipe 2 and the lower heating pipe 3 mentioned above. It is provided with a downcomer pipe 8 which is connected to the side and extends upward, and then reaches the working fluid 6 in the working fluid container 5 below through a bent portion.

In order to prevent backflow of the working fluid 6 in the ascending pipe 7 and the descending pipe 8, a check valve 9 is provided above the descending pipe 8 on the suction side (lower part) of the ascending pipe 7 immersed in the working fluid 6. Check valves 10 are respectively attached to the bent portions of the heating unit 1, and fins 11 for promoting heat transfer are provided around the upper heating pipe 2 and the lower heating pipe 3 in the heating unit 1.

In the heating unit 1, as shown in detail in FIG. 2, a high temperature fluid is supplied to the high temperature fluid passages around the upper heating pipe 2 and the lower heating pipe 3 to supply the high temperature fluid inside the pipes 2 and 3. A plurality of heating means 12 for heating the working fluid 6 and a cryogenic fluid flow path around the upper heating pipe 2 and the lower heating pipe 3 are supplied with a cryogenic fluid so that the working fluid 6 in these pipes 2, 3 A plurality of cooling means 13 for cooling the above are alternately provided, and the high temperature fluid passages and the low temperature fluid passages are partitioned by partition walls 14a to 14f.

The heating means 12 is for supplying a high temperature fluid from a high temperature heat source located at a position higher than the working fluid container 5 to the high temperature fluid passage, and the cooling means 13 is an appropriate cooling fluid. To supply to the low temperature fluid channel. The high temperature fluid and the low temperature fluid supplied to these flow paths may be air or other gas, or water or other liquid.

Next, the operation of the heat-driven pump will be described with reference to FIGS. 1 and 2. With the working fluid 6 filled in the upper and lower heating pipes 2, 3 and the rising pipe 7 and the descending pipe 8, the heating means 12 supplies the high temperature fluid from the high temperature heat source to the high temperature fluid flow path in the heating section 1, When the upper heating pipe 2 and the lower heating pipe 3 of the heating unit 1 are heated by the high temperature fluid, the working fluid 6 flowing in the heating pipes 2 and 3 is heated, and bubbles 15 are generated. FIG. 2 shows a state in which the working fluid 6 flowing in the directions of the arrows in the heating tubes 2 and 3 is heated and bubbles 15 are generated. The amount of bubbles 15 generated depends on the amount of heat of the high temperature fluid to be supplied. The larger the amount of heat, the greater the amount of bubbles generated, and the pressure inside the heating tubes 2 and 3 rises accordingly. The working fluid 6 or the vapor thereof in the heating pipes 2 and 3 is returned to the container 5 through the valve 10 and the descending pipe 8, and the vapor is condensed.

When the bubbles 15 thus generated move in the heating tubes 2 and 3 and reach the low temperature fluid passage, the bubbles 15 are forcibly cooled by the cooling fluid supplied to the low temperature fluid passage. , And the pressure in the upper and lower heating pipes 2 and 3 is reduced accordingly, so that the working fluid 6 in the working fluid container 5 is sucked through the check valve 9 and the rising pipe 7 by its suction force. To be done.

The cooling fluid is intended to cool the heating tubes 2 and 3 to extract the heat quantity necessary for extinguishing the bubbles 15 inside, to the outside. Therefore, in consideration of the scale of the heat source of the high temperature fluid and the like. Thus, the supply position, amount, or temperature of the cooling fluid can be adjusted appropriately, and thereby the disappearance of the bubbles 15 can be controlled from the outside. If the temperature or amount of the heating fluid fluctuates due to fluctuations in the heat source temperature, control is required to detect the temperature and adjust the temperature or amount of the cooling fluid.

As described above, the generation amount of the bubbles 15 in the heating tubes 2 and 3 and the cooling position and the cooling capacity by the low temperature fluid are adjusted, and the generation and disappearance of the bubbles are smoothly repeated. It is possible to heat and circulate the working fluid 6 at the same time, and to heat and circulate the working fluid 6 with a simple apparatus on a large scale and stably.

The cooling fluid supplied to the low temperature fluid flow path and used for cooling the working fluid 6 in the upper and lower heating pipes 2 and 3 is heated by the contact with the heating pipes 2 and 3, and the temperature rises. Therefore, the heat can be recovered and utilized. For example, a heat exchanger is provided in the middle of the rising pipe 7 and used for preheating the working fluid 6 flowing into the heating pipes 2 or 3, or It can also be used as a heat source by sending it to the heat equipment.

FIG. 3 shows another structural example of the heating tube used as the upper or lower heating tube in the above-mentioned embodiment. In this heating tube 20, heating is performed in a portion located in the high temperature fluid flow path. A heat transfer promoting member 21 formed of a wire mesh cylinder or the like is inserted into the tube 20, and a narrow heat transfer promoting gap 22 is formed between the heat transfer promoting member 21 and the inner wall surface of the heating tube. As a result, heat can be efficiently transferred to the working fluid 6 in the gap 22 to promote the formation of the bubbles 15. The rest of the configuration and operation are similar to those of the above-mentioned embodiment.

[0017]

[Effect of device]

 As is clear from the above description, the heat-driven pump according to the present invention enhances the driving force of the heat-driven pump by smoothing the generation and disappearance of bubbles, and operates when a large-scale heat source is used. It is possible to solve the conventional problem that the driving force for sucking the fluid is not generated and to stably heat and circulate the working fluid by a simple device even on a large scale. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of a heat-driven pump according to the present invention.

FIG. 2 is a cross-sectional view showing details of a heating unit in the above embodiment.

FIG. 3 is a cross-sectional view showing another embodiment of the upper and lower heating tubes.

[Explanation of symbols]

 1 heating part, 2 upper heating pipe, 3 lower heating pipe, 5 working fluid container, 6 working fluid, 7 ascending pipe, 8 descending pipe, 9, 10 check valve, 12 heating means, 13 cooling means, 15 bubbles, 20 Heating tube, 21 heat transfer promoting member, 22 heat transfer promoting gap.

Claims (2)

[Scope of utility model registration request] 1. A heating unit in which an upper heating pipe and a lower heating pipe are arranged to be heated by a high-temperature fluid from a heat source, and a bending portion after connecting to the suction side and the discharge side of these heating pipes and extending upward. A riser pipe and a downcomer pipe that reach the working fluid in a lower working fluid container through a portion, and a check valve that prevents the backflow of the working fluid in the riser pipe and the downcomer pipe. The heating unit is provided with a plurality of heating means for heating the upper heating tube and the lower heating tube, and a plurality of cooling means for cooling and condensing the bubbles generated in these heating tubes, which are alternately arranged. A heat-driven pump characterized by that. 2. The heat-driven pump according to claim 1, wherein a heat transfer promoting member is inserted into the heating pipe in the heating section to form a narrow heat transfer promoting gap between the heating pipe wall and the heat transfer promoting member. , A heat driven pump.