Pump facility

Abstract

To improve a cooling capacity while reducing an installation space and reducing costs and labor.SOLUTION: A pump facility comprises: a heat source device 11; cooling water pipes P5, P6, P7, P8 through which cooling water for cooling the heat source device 11 flows; a cooler 22 that cools the cooling water; and cooling materials 31, 32 provided on at least some of the outer peripheries of the cooling water pipes P5, P6, P7, P8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pump installation. [Background technology]

[0002] In recent years, sudden rainfall due to torrential rains and weather changes have increased the demand for increased pumping capacity (increased water volume) at drainage pumping stations, and it is necessary to increase the output of the prime mover in response to the increased pumping capacity. For example, if the prime mover is a diesel engine, the existing engine delivery is old and parts are no longer available, and the engine model has changed and the number of turbochargers has increased, which can increase the amount of cooling required. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-226420 A Summary of the Invention [Problem to be solved by the invention]

[0004] Engines that drive large pumps are water-cooled, but in order to simplify auxiliary equipment, the cooling system often uses a separate radiator, in-pipe cooler, in-tank cooler, or cooling tower. When the power output of an existing engine is increased or the amount of cooling required increases, the cooler in the existing cooling system needs to be updated, but due to issues such as installation space, it is not possible to update to a larger one, and a separate cooler needs to be prepared. In particular, at power plants that use in-pipe coolers as coolers, there are many restrictions on heat exchangers, making replacement difficult.

[0005] To address this problem, conventionally, in order to improve the cooling capacity of the cooling system, a new cooler such as a separate radiator has been installed, but this approach requires a lot of cost and space for installation, making it difficult to implement. For example, Patent Document 1 discloses a technology in which a cooling water pipe is attached to the discharge bowl of a vertical pump and the discharge water is used to cool the lubricating oil of the reduction gear and thrust bearing. In this case, cooling of the prime mover such as a diesel engine is not taken into consideration, and it is necessary to modify the existing pump, which causes a problem of considerable effort and cost.

[0006] The present invention has been made in consideration of the above problems, and aims to provide a pump facility that makes it possible to improve cooling capacity while reducing installation space, costs, and labor. [Means for solving the problem]

[0007] A pump facility according to a first aspect of the present invention comprises a heat source device, a cooling water pipe through which cooling water flows for cooling the heat source device, a cooler for cooling the cooling water, and a coolant provided on at least a portion of an outer periphery of the cooling water pipe.

[0008] According to this configuration, the coolant is provided around the outer periphery of the cooling water piping to cool the cooling water piping, thereby reducing installation space and improving cooling capacity while reducing costs and labor.

[0009] A pump equipment according to a second aspect of the present invention is the pump equipment according to the first aspect, wherein the cooling water piping includes a first piping provided between the heat source equipment and the cooler, and a second piping provided between the cooler and a confluence point of the return water and the inflow water, and the coolant is provided around the first piping and / or around the second piping.

[0010] According to this configuration, the high-temperature cooling water on the secondary side of the heat dissipation device can be cooled, thereby efficiently cooling the cooling water.

[0011] A pump facility according to a third aspect of the present invention is the pump facility according to the first or second aspect, wherein the coolant includes a phase change material.

[0012] According to this configuration, when the pump starts operating and the temperature of the cooling water reaches or exceeds the melting point of the phase change material, the cooling water is cooled by the latent heat of fusion generated when the phase changes from solid to liquid, and the temperature of the cooling water drops. On the other hand, when the pump stops operating and the temperature of the cooling water falls below the melting point of the phase change material, the phase change material changes from liquid to solid and can be used again as a coolant, which has the advantage that almost no maintenance is required. Another advantage is that cooling occurs by melting, so no external energy is required. Another advantage is that almost no maintenance costs are required, since no maintenance is required except for damage due to external factors and deterioration of the container of the phase change material over time.

[0013] A pump equipment according to a fourth aspect of the present invention is the pump equipment according to any one of the first to third aspects, wherein the coolant is enclosed in a sealed container and formed in a band shape, and the coolant is wound circumferentially or spirally around the cooling water pipe, or is arranged so as to be in close contact with the cooling water pipe along the longitudinal direction.

[0014] According to this configuration, by wrapping the material tightly around the entire pipe, the heat transfer area is increased, which promotes melting of the phase change material and enables efficient use of the latent heat of fusion.

[0015] A pump equipment according to a fifth aspect of the present invention is the pump equipment according to any one of the first to fourth aspects, wherein the coolant is formed in layers of a plurality of phase change materials having different melting points, and a first phase change material on the surface side in contact with the cooling water pipe has a lower melting point than a second phase change material among the plurality of phase change materials.

[0016] With this configuration, the phase change material melts in stages, which lengthens the time it takes to completely melt, and the cooling water is cooled or kept warm at or below a specified temperature for a long period of time, making it possible to operate the pump for a long period of time.

[0017] A pump facility according to a sixth aspect of the present invention is the pump facility according to any one of the third and fifth aspects, wherein the plurality of phase change materials are thicker on an outer side than on a surface in contact with the cooling water pipe.

[0018] According to this configuration, the phase change material gradually becomes thicker as it melts in stages starting from one with a small melting point or latent heat of fusion, which lengthens the time it takes to transition from solid to liquid, and therefore the time it takes to completely melt can be extended, and the cooling water can be cooled or kept warm at or below a specified temperature for a long period of time, making it possible to operate the pump for a long period of time.

[0019] A pump equipment according to a seventh aspect of the present invention is the pump equipment according to any one of the first to sixth aspects, wherein the material of the inner surface of the coolant facing the cooling water piping has a higher thermal conductivity than the material of the outer surface of the coolant.

[0020] According to this configuration, the latent heat and sensible heat of fusion of the phase-change material can be efficiently transferred to the cooling water, and energy loss due to melting due to exposure to the outside air can be prevented.

[0021] A pump equipment according to an eighth aspect of the present invention is the pump equipment according to any one of the first to seventh aspects, wherein the cooler is an in-pipe cooler or an in-tank cooler, and further comprises a drain valve provided in the cooling water piping to discharge the cooling water in the cooling water piping, and a control device that controls the drain valve to open after the pump is stopped and controls the drain valve to remain open for a set time.

[0022] With this configuration, by replacing the cooling water with low-temperature cooling water, cooling can be promoted from the inside of the phase-change material, the phase-change time from liquid to solid can be shortened, and the pump can be prepared for the next operation even in operations where the pump is started and stopped frequently.

[0023] A pump equipment according to a ninth aspect of the present invention is the pump equipment according to any one of the first to seventh aspects, wherein the cooler is a separate radiator or cooling tower, and the pump includes a circulating water pump for circulating the cooling water, and a control device that controls the operation of the fan of the separate radiator or cooling tower and the circulating water pump to continue after the pump is stopped until the cooling water temperature drops to a set temperature, which is the temperature at which a phase change material changes from liquid phase to solid phase.

[0024] With this configuration, cooling can be promoted from the inside of the phase-change material, shortening the phase-change time from liquid to solid, allowing the pump to prepare for the next operation even in operations that require frequent starting and stopping.

[0025] A pump facility according to an eleventh aspect of the present invention is the pump facility according to any one of the first to tenth aspects, wherein the heat source device is a driving machine and / or a reduction gear.

[0026] A pump facility according to a twelfth aspect of the present invention is the pump facility according to the eleventh aspect, wherein the driving machine is an engine or an electric motor. Effect of the Invention

[0027] According to one aspect of the present invention, the cooling water is cooled by providing a coolant around the outer periphery of the cooling water piping to cool the cooling water piping, thereby reducing installation space and improving cooling capacity while reducing costs and labor. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 is a schematic configuration diagram of a pump facility when an in-pipe cooler is used in the first embodiment. [Diagram 2] FIG. 2 is a schematic perspective view of a coolant; [Diagram 3] FIG. 2 is a perspective view showing a first mode when a coolant is used. [Figure 4] FIG. 2 is a cross-sectional view showing a first mode when a coolant is used. [Diagram 5]FIG. 11 is a perspective view showing a third mode when the coolant is used. [Figure 6] FIG. 11 is a perspective view showing a fourth embodiment of the coolant. [Figure 7A] FIG. 13 is a perspective view showing a modification of the first embodiment of the coolant. [Figure 7B] FIG. 13 is a perspective view showing a modified example of the third embodiment of the coolant. [Figure 8A] FIG. 2 is a cross-sectional view showing one embodiment of a coolant. [Figure 8B] FIG. 4 is a cross-sectional view showing another embodiment of the coolant. [Figure 9A] FIG. 2 is a schematic diagram showing one embodiment of a control device. [Figure 9B] FIG. 4 is a schematic diagram showing another embodiment of the control device. [Figure 10] FIG. 2 is a schematic diagram of a pump facility showing a drainage line. [Figure 11] FIG. 2 is a schematic diagram of a pump facility showing a drainage line. [Figure 12] FIG. 11 is a schematic configuration diagram of a pump facility when an in-tank cooler is used in the second embodiment. [Figure 13] 10 is a flowchart showing an example of a stopping process in the first or second embodiment. [Figure 14] FIG. 11 is a schematic configuration diagram of a pump facility when a separate radiator is used in the third embodiment. [Figure 15] FIG. 13 is a schematic configuration diagram of a pump facility when a cooling tower is used in the fourth embodiment. [Figure 16] 13 is a flowchart showing an example of a stopping step in the third or fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, each embodiment will be described with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters or duplicate description of substantially the same configuration may be omitted. This is to avoid the following description becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0030] In each embodiment, in order to solve the above problems, the pump equipment includes a heat source device (e.g., a driving machine and / or a reduction gear), a cooling water cooling water piping through which cooling water flows for cooling the heat source device, a cooler (e.g., a separate radiator, a cooling tower, an in-pipe cooler or an in-tank cooler, etc.) for cooling the cooling water, and a coolant provided on at least a portion of the outer periphery of the cooling water cooling water piping.

[0031] Specifically, for example, by winding a coolant using a phase change material around a cooling water pipe, the cooling capacity of the cooler can be easily supplemented. When the temperature of the cooling water sent to a driving machine (for example, an engine or an electric motor), which is an example of a heat source device, becomes high, the phase change material wrapped around the cooling water pipe melts at a specific temperature and lowers the temperature of the cooling water by the latent heat of fusion, thereby supplementing the cooling capacity that cannot be met by the existing cooler alone. In addition, when the pump operation ends and the temperature of the cooling water falls below the melting point of the phase change material, it solidifies again, which has the advantage that it can be used repeatedly. Furthermore, for example, by using multiple types of phase change materials with different melting points (or latent heat of fusion) to form a multi-layer structure, the cooling capacity can be improved, and since it can respond to an increase in the amount of cooling required, the pump can be operated for a long period of time.

[0032] <First embodiment> 1 is a schematic configuration diagram of a pump facility using an in-pipe cooler in the first embodiment. The pump facility 1 includes an engine 11, which is an example of a driving machine, a reduction gear 12 that reduces the rotational force transmitted from the engine 11, a hydraulic clutch 13 provided in the reduction gear 12 that switches on and off the transmission of power from the engine, and a pump 14 that drives in response to the power from the reduction gear 12. The engine 11 is, for example, a diesel engine. The pump 14 is, for example, a vertical shaft pump.

[0033] The pump equipment 1 further includes cooling water pipes P1-P10 through which cooling water flows for cooling heat source equipment (for example, a driving machine (specifically, the engine 11 or an electric motor) and / or a reducer), a circulating water pump 15 provided in the engine 11, a flow relay 16 that detects the flow based on the flow rate of the cooling water in the cooling water pipe P2, a cooling component 17 provided in the reducer 12, a flow relay 18 that detects the flow based on the flow rate of the cooling water, a temperature control valve 19, and an expansion tank 20 which is an example of a tank that absorbs the expansion of the cooling water. The cooling water pipes P1-P10 are cylindrical pipes made of metal such as SUS pipes or SGP pipes.

[0034] One end of the cooling water pipe P1 is connected to the expansion tank 20, and branches into cooling water pipes P2 and P3. The cooling water pipe P2 is connected to the circulating water pump 15. Meanwhile, the cooling water pipe P3 is connected to the temperature control valve. One end of the cooling water pipe P15 is connected to the circulating water pump, and passes through the engine to the temperature control valve 19. The temperature control valve 19 switches the water flowing in from the cooling water pipe P15 via the cooling water pipe P1, the cooling water pipe P2, and the circulating water pump 15 to the cooling water pipe P5 and the cooling water pipe P3, and drains it. In one embodiment, the temperature control valve has a wax type basic structure.

[0035] For example, if the water flowing into the temperature control valve 19 from the cooling water pipe P15 is higher than the set temperature, the wax inside the temperature control valve 19 melts and expands, causing the water destination of the temperature control valve 19 to switch from the cooling water pipe P3 to the cooling water pipe P5, and the cooling water is cooled by the cooler. On the other hand, for example, when the temperature of the water flowing into the temperature control valve 19 from the cooling water pipe P15 is lower than the set temperature, the wax inside the temperature control valve 19 shrinks, causing the temperature control valve 19 to switch the water destination from the cooling water pipe 5 to the cooling water pipe 3. To prevent the engine 11 from becoming too cold, the water flow is switched to the bypass pipe (cooling water pipe P3) and the cooling water is returned to the inlet side of the engine 11, thereby switching to a flow that prevents the engine 11 from being overcooled.

[0036] One end of the cooling water pipe P4 is connected to the circulating water pump 15, and the other end is connected to the cooling component 17. As a result, the cooling component 17 provided in the reducer 12 cools the reducer 12 (e.g., the lubricating oil of the reducer 12) using water supplied through the cooling water pipe P4. One end of the cooling water pipe P6 is connected to the cooling component 17, and merges with the cooling water pipe P5 to connect to the cooling water pipe P7. The other end of the cooling water pipe P7 is connected to the in-pipe cooler 22. As a result, the water supplied through the cooling water pipes P5 and P6 is guided to the in-pipe cooler. One end of the cooling water pipe P8 is connected to the in-pipe cooler 22, and the other end is connected to the expansion tank 20.

[0037] The pump equipment 1 further includes a supply water tank 21 that supplies water to the expansion tank 20 via a cooling water piping P9, an in-pipe cooler 22 which is an example of a cooler and is provided in the pump 14 to cool the cooling water, an engine 11, a circulating water pump 15, a temperature control valve 19, etc. The pump equipment 1 further includes a control device 23 that controls the engine 11, the circulating water pump 15, and auxiliary machinery and instrumentation (not shown) for starting the engine 11.

[0038] The pump equipment 1 further includes a coolant 31 provided around at least a portion of the outer periphery of the cooling water pipes P5, P6, and P7. As an example here, the coolant 31 is wound around the entire length of the cooling water pipes P5, P6, and P7. The pump equipment 1 further includes a coolant 32 provided around at least a portion of the outer periphery of the cooling water pipe P8. As an example here, the coolant 32 is wound around the entire length of the cooling water pipe P8. That is, the cooling pipes P5 to P7 are covered with a coolant 31, and the cooling pipe P8 is covered with a coolant 32.

[0039] In pump equipment that uses an engine as a driving machine, cooling water is used to cool the engine. A constant amount of cooling water is supplied from a make-up water tank to an expansion tank via a ball tap, and the engine is cooled from the expansion tank via a circulating water pump equipped with the engine. The cooling water coming out of the engine outlet is cooled by an in-pipe cooler 22, which is an example of a cooler, and is sent back to the expansion tank.

[0040] Furthermore, if the engine 11 coolant temperature is too low, combustion will not be complete and fuel consumption will increase, which may result in abnormal wear of parts due to residual fuel, or the set lubricating oil temperature may not be reached and lubrication performance may not be maintained. Therefore, to prevent overcooling, a temperature control valve 19 is used to switch from the coolant line to the hot water lubrication line. The amount of cooling required increases due to an increase in engine output caused by an increase in pump power, or due to a change in engine model and an increase in turbochargers, etc., and the existing cooling function is no longer able to meet this demand. Therefore, coolants 31 and 32 are provided to supplement the cooling capacity.

[0041] Thus, the pump equipment 1 comprises a heat source equipment (e.g., an engine 11), cooling water pipes P5, P6, P7, and P8 through which cooling water flows to cool the heat source equipment, a cooler (here, an in-pipe cooler 22) that cools the cooling water, and coolants 31 and 32 provided on at least a portion of the outer periphery of the cooling water pipes P5, P6, P7, and P8.

[0042] With this configuration, the engine inlet temperature of the cooling water can be kept below a specified value. Since a new cooler (such as a separate radiator) is not required, space can be saved, costs can be reduced, and maintenance burdens can be reduced. Since no special tools or construction is required, construction time can be shortened. Since no electricity is required, costs can be reduced.

[0043] The cooling water piping includes a first pipe (e.g., cooling water pipes P5, P6, P7) provided between a heat source device (e.g., an engine, a reduction gear) and a cooler (here, an in-pipe cooler 22), and a second pipe (e.g., cooling water pipe P8) provided between the cooler (here, the in-pipe cooler 22) and a junction (here, an expansion tank 20) ​​of the return water and the inflow water from the cooler. Coolants 31, 32 are provided (e.g., wrapped) around the first pipe and / or the second pipe. Here, the heat source device also includes heat-generating components. With this configuration, the high-temperature cooling water on the secondary side of the heat source device can be cooled to efficiently cool the cooling water.

[0044] For example, the coolants 31 and 32 include a phase change material. Specifically, for example, the coolants 31 and 32 have a structure in which the phase change material is wrapped in a pack. With this configuration, when the pump 14 (i.e., the engine 11) starts operating and the temperature of the coolant becomes equal to or higher than the melting point of the phase change material, the coolant is cooled by the latent heat of fusion generated when the phase changes from solid to liquid, and the temperature of the coolant decreases. On the other hand, when the pump stops operating and the temperature of the coolant becomes equal to or lower than the melting point of the phase change material, the phase change material changes from liquid to solid, and can be used again as a coolant. In addition, the coolant in the coolant pipe P8 attached to the heat exchanger outlet has a lower temperature than the coolant in the coolant pipes P5, P6, and P7 from the outlet of the engine / reducer to the inlet of the heat source device, so that the coolant 32 covered by the coolant pipe P8 is made of a material whose phase change material has a lower melting temperature than the coolant 31.

[0045] This has the advantage that it requires almost no maintenance. In addition, since cooling occurs by melting, it does not require external energy. Since no maintenance is required except for damage caused by external factors and deterioration of the container of phase change material over time, it also has the advantage that there are almost no maintenance costs. The type of phase change material may be changed depending on the purpose and / or temperature of use.

[0046] An example of the structure of the coolant 32 will be described using the cooling water pipe P8 as an example, representing the coolants 31 and 32. The coolant 31 enveloping the cooling water pipes P5 to P7 has a similar structure, but its description will be omitted. Fig. 2 is a schematic perspective view of an example of the coolant. As shown in Fig. 2, the coolant 32 is formed in a strip shape, for example, with a cooling material 32-2 enveloping in a sealed container 32-1.

[0047] Fig. 3 is a perspective view showing a first mode when the coolant is used, and Fig. 4 is a cross-sectional view showing the first mode when the coolant is used. 3 and 4, the coolant 32 may be wound around the cooling water pipe P8 in the circumferential direction. With this configuration, the coolant 32 is wound tightly around the entire pipe, which increases the heat transfer area, promotes melting of the phase change material, and enables efficient use of the latent heat of fusion.

[0048] In addition, the surface of the container 32-1 that comes into contact with the cooling water pipe (surface 32A in Figs. 3 and 4) may be made of a material with high thermal conductivity in order to efficiently transfer the latent heat and sensible heat of fusion of the phase change material to the cooling water. Conversely, the surface facing the atmosphere that does not come into contact with the cooling water pipe (surface 32B in Figs. 3 and 4) may be made of a material with low thermal conductivity in order to prevent energy loss due to melting in the outside air.

[0049] Fig. 5 is a perspective view showing a third mode when the coolant is used. As shown in Fig. 5, the coolant 32 is composed of coolant 32a and coolant 32b and has a double door structure, and the coolants 32a and 32b may be provided so as to be in close contact with each other along the longitudinal direction (i.e., the extension direction) of the cooling water pipe P8. With this configuration, the coolants are in close contact with the entire pipe, which increases the heat transfer area, promotes melting of the phase change material, and allows efficient use of the latent heat of fusion.

[0050] Fig. 6 is a perspective view showing a fourth embodiment of the coolant. In Fig. 6, the coolant 32 is hollow and cylindrical, and may be arranged to cover the cooling water pipe P8 as shown by the arrow A1.

[0051] Fig. 7A is a perspective view showing a modification of the first embodiment of the cooling material. As shown in Fig. 7A, a fastening member 33a such as a zipper may be provided between the cooling materials 32b1 and 32b2 to fasten them, and a fastening member 33b such as a zipper may be provided between the cooling materials 32b2 and 32b3 to fasten them. The fastening members 33a and 33b may be Velcro.

[0052] Fig. 7B is a perspective view showing a modified example of the third embodiment of the cooling material. As shown in Fig. 7B, a fastening member 34 such as a zipper may be provided between the cooling materials 32c1 and 32c2 to fix them. The fastening member 34 may be a Velcro tape.

[0053] In this way, as a structure for easy attachment, the belt-shaped phase change material and the cooling water pipe may be attached tightly with a zipper or Velcro.

[0054] The attachment structure may be a structure in which the container is attached using double-sided tape, adhesive, magnets, or buttons, or a structure in which the outer surface of the container is bound with a cable tie or string.

[0055] The phase change material processed into a strip is designed based on thermal energy calculations so that the cooling water will be below a specified temperature, and the thickness and volume of the pack are determined. For example, the volume of the phase change material is determined so that the amount of energy (calorie) required to lower the temperature of the water to below a specified temperature is equal to or greater than the amount of energy required. For example, if the cooling water required to cool an engine is 1000 l / min and the temperature needs to be lowered by 1 degree, the required energy is 4.2 kJ / min. In the case of n-eicosane (melting point 36.7°C), if the latent heat of fusion of the phase change material is 247.3 kJ / kg, about 17 g is required per minute. In this way, the volume of the phase change material is determined based on the specified temperature of the water and the expected operating time, and the thickness and length of the pack are determined.

[0056] The coolant may be a pack containing a phase-change material, in which case the length of one coolant (i.e., pack) may be about 1 m for ease of installation and attachment to bent pipes. The length of the pack may be longer than 1m when there are very long straight pipe sections, but may be shorter than 1m when there are many bends.

[0057] 8A is a cross-sectional view showing one embodiment of the coolant. As shown in FIG. 8A, the coolant 32 has, for example, an inner peripheral layer 35 in contact with the cooling pipe, a first phase change material layer 321, a second phase change material layer 322, a third phase change material layer 323, and a fourth phase change material layer 324, which are laminated in this order in a ring shape in vertical section, and an outer peripheral layer 36 provided on the outer periphery of the fourth phase change material layer 324 of the coolant 32.

[0058] For example, the melting points of the phase change materials of first phase change material layer 321 to fourth phase change material layer 324 are different, and they melt in sequence in the order of first phase change material layer 321, second phase change material layer 322, third phase change material layer 323, and fourth phase change material layer 324. Specifically, for example, first phase change material layer 321 may be set to start melting at 40 degrees, second phase change material layer 322 at 45 degrees, third phase change material layer 323 at 50 degrees, and fourth phase change material layer 324 at 55 degrees.

[0059] In this case, it is assumed that when the pump (engine) starts operating, the temperature of the cooling water is 20 degrees (outside air temperature), but the cooling capacity is insufficient and the temperature gradually rises. In this case, when the cooling water temperature reaches 40 degrees, first phase change material layer 321 melts and starts cooling the cooling water. When the operation continues and the temperature rises further, and the cooling water temperature and the temperature of first phase change material layer 321 reach 45 degrees, second phase change material layer 322 starts to melt and starts cooling the cooling water.

[0060] Thus, in one embodiment, the coolant 32 is formed in layers of multiple phase change materials with different melting points (for example, with a ring-shaped longitudinal section), and the multiple phase change materials may be arranged in order of decreasing melting point from the surface side in contact with the cooling water pipe.

[0061] It is not necessary that all of the phase change materials are arranged in ascending order of melting point from the surface side in contact with the cooling water pipe. The melting points of the first phase change material layer 321 and the second phase change material layer 322 may be the same, the melting points of the second phase change material layer 322 and the third phase change material layer 323 may be the same, or the melting points of the third phase change material layer 323 and the fourth phase change material layer 324 may be the same. In this way, the melting point of the first phase change material (e.g., the first phase change material layer 321) on the surface side in contact with the cooling water pipe is lower than that of the second phase change material (e.g., the second phase change material layer 322) among the multiple phase change materials. With this configuration, the phase change material melts stepwise, so that the time it takes to completely melt is extended, and the cooling water is cooled and kept warm at a temperature below a specified temperature for a long time. As a result, the pump can be operated for a long time.

[0062] In order to efficiently transfer the latent heat and sensible heat of fusion of the phase change material to the cooling water and to prevent energy loss due to melting by the outside air, the material of the inner surface (the cooling water piping side) of the coolant facing the cooling water piping (the material of the inner circumferential layer 35) may be a material with high thermal conductivity, and the material of the outer surface (the side in contact with the atmosphere) (the material of the outer circumferential layer 36) may be a material with lower thermal conductivity (for example, a heat insulating material). In other words, the material of the inner circumferential surface of the coolant may have a higher thermal conductivity than the material of the outer circumferential surface of the coolant.

[0063] Furthermore, the inner peripheral layer 35 may be omitted from the structure as required. For example, the surface of the innermost coolant 321 that comes into contact with the inner cooling water piping of the coolant container may be made of a material with high thermal conductivity, thereby omitting the structure of the inner peripheral layer 35. Furthermore, the outer peripheral layer 36 may be omitted as required. For example, the outer surface of the coolant container that comes into contact with the atmosphere side of the outermost coolant 324 may be made of a material with low thermal conductivity, thereby omitting the structure of the outer peripheral layer 36.

[0064] In addition, in order to increase the heat transfer property of the phase change material, promote melting, and easily obtain the latent heat of fusion, the phase change material may contain metal nanopowder.

[0065] In order to facilitate heat exchange between the layers, the phases may be separated by a thin metal film (for example, a thin aluminum film: not shown).

[0066] The multi-layer structure may be changed according to the required cooling capacity, the phase change material may be changed according to the required cooling capacity, and the type of metal film between layers may be changed to any metal such as stainless steel or copper as required. In addition, thermocouples and temperature sensors are inserted between each layer, and the control device 23 may detect abnormalities (such as leakage or malfunction of phase change material due to damage to the pack) based on the temperatures detected by the thermocouples and temperature sensors, or may monitor the states of the solid and liquid phases.

[0067] Fig. 8B is a cross-sectional view showing another embodiment of the coolant. Compared to Fig. 8A, the first phase change material layer 321, the second phase change material layer 322, the third phase change material layer 323, and the fourth phase change material layer 324 have different thicknesses, and the thicknesses increase in this order from the surface side in contact with the cooling water pipe. That is, the thicknesses increase in the order of the first phase change material layer 321, the second phase change material layer 322, the third phase change material layer 323, and the fourth phase change material layer 324. This is applicable to the case where a plurality of phase change materials with different melting points are formed in layers.

[0068] In this way, the multiple phase change materials may be thicker on the outside than on the surface that contacts the cooling water pipe. This allows the phase change materials to gradually increase in thickness as they melt in stages, starting with those with the lowest melting points or latent heat of fusion, and therefore the time it takes to transition from solid to liquid can be extended, so the time it takes to completely melt can be extended, and the cooling water can be cooled or kept warm at or below a specified temperature for a long period of time. As a result, the pump can be operated for a long period of time.

[0069] FIG. 9A is a schematic diagram showing one embodiment of the control device. The control device 23 is a device that controls the engine 11 and the circulating water pump 15 in the pump equipment 1, and auxiliary machinery and instrumentation (not shown) for starting the engine 11. As shown in FIG. 9A, the control device 23 may be a control panel including hardware such as a relay. FIG. 9B is a schematic diagram showing another embodiment of the control device. As shown in FIG. 9B, the control device 23 may include a PLC (Programmable Logic Controller) housed in the control panel. In this way, the control device 23 may be a control panel that performs control, and may be controlled by software using a PLC housed in the control panel, or may be controlled by hardware using relays.

[0070] FIG. 10 is a schematic diagram of the pump equipment showing the drain line. As shown in FIG. 10, the pump equipment is provided with a cooling water pipe P10 communicating with the cooling water pipe P7, and a drain valve 41 is provided in the cooling water pipe P10 to discharge the cooling water in the cooling water pipes P1 to P8 and P10. The drain valve 41 can be controlled by the control device 23. When the drain valve 41 is opened, as shown by the drain line of the arrow in FIG. 10, the cooling water discharged from the expansion tank 20 passes through the cooling water pipes P1, P2, P3, P4, P5, P6, P7, and P10 in this order, and is discharged into the suction water tank 42. In this way, the high-temperature cooling water in the cooling water pipe can be discharged by opening the drain valve 41.

[0071] Fig. 11 is a schematic diagram of the pump equipment showing the drain line. When the drain valve 41 is closed, as shown by the arrow lines in Fig. 11, the cooling water discharged from the expansion tank 20 passes through the cooling water pipes P1, P2, P3, P4, P5, P6, P7, and P8 in this order, and the cooling water is filled. In this way, the cooling water pipes can be filled with low-temperature cooling water by closing the drain valve 41.

[0072] As described above, the pump equipment according to the first embodiment includes a heat source device, a cooling water pipe through which cooling water for cooling the heat source device flows, a cooler for cooling the cooling water, and a coolant provided on at least a part of the outer periphery of the cooling water pipe. According to this configuration, the cooling water is cooled by providing the coolant on the outer periphery of the cooling water pipe to cool the cooling water pipe, so that it is possible to reduce installation space and improve cooling capacity while reducing costs and labor.

[0073] In the first embodiment, the cooler is described as an in-pipe cooler, but the cooler is not limited to an in-pipe cooler and may be an in-tank cooler, a separate radiator, or a cooling tower, as described in the embodiments described later.

[0074] <Second embodiment: In-tank cooler> 12 is a schematic diagram of the pump equipment in the second embodiment when an in-tank cooler is used. In the pump equipment 1b in the second embodiment, the in-pipe cooler 22 is changed to an in-tank cooler 43 provided in a discharge water tank 46, as compared with the pump equipment 1 in the first embodiment. The in-tank cooler 43 is connected to the discharge port of the cooling water pipe P7 and to the suction port of the cooling water pipe P8. The in-tank cooler 43 cools the cooling water flowing in from the cooling water pipe P7 using water in the suction water tank 42, and discharges the cooled cooling water to the suction port of the cooling water pipe P8.

[0075] FIG. 13 is a flowchart showing an example of the stopping step in the first or second embodiment. (Step S110) The control device 23 stops the engine 11 and closes an engine stop valve (not shown).

[0076] (Step S120) The control device 23 reduces the speed of the engine 11.

[0077] (Step S130) The control device 23 sets a first set time (for example, 30 seconds) in a built-in timer (not shown).

[0078] (Step S140) When the timer reaches the first set time, the control device 23 stops the engine 11 and opens the engine stop valve for the set time.

[0079] (Step S150) In parallel with step S130, the control device 23 sets a second set time (for example, 180 seconds) in the timer.

[0080] (Step S160) When the timer reaches the second set time, the control device 23 stops the engine lubricating oil pump (not shown).

[0081] (Step S165) When the timer reaches the second set time, the control device 23 stops the reducer lubricating oil pump (not shown).

[0082] (Step S170) The control device 23 resets the lamp indicating "stopped", thereby turning off the lamp indicating "stopped".

[0083] (Step S180) The controller 23 controls the drain valve 41 of the cooling water pipe P10 to open.

[0084] (Step S185) In parallel with step S180, the control device 23 turns on a lamp indicating that "phase change material cooling process in progress."

[0085] (Step S190) In parallel with step S180, the control device 23 sets a third set time in the timer. Here, the third set time is the time it takes for the cooling water in the cooling water pipes to be replaced.

[0086] (Step S200) When the timer reaches the third set time, the control device 23 controls the drain valve 41 of the cooling water pipe P10 to close.

[0087] (Step S210) Then, the control device 23 resets and turns off the lamp indicating that the "phase change material cooling process is in progress".

[0088] (Step S220) The control device 23 controls the flow relay 16 for the engine cooling water to be cut off.

[0089] (Step S230) Then, the control device 23 resets and turns off the lamp indicating that "engine cooling water is passing."

[0090] (Step S240) In parallel with step S220, the flow relay 18 for the reducer cooling water is controlled to be cut off.

[0091] (Step S250) Then, the control device 23 resets and turns off the lamp indicating that "reduction gear cooling water is passing."

[0092] In this way, when the main pump and the engine are stopped, the process proceeds to the phase change material cooling process, the drain valve 41 attached to the cooling water pipes is opened, the high-temperature cooling water in the cooling water pipes P1 to P8, P10 is drained, and low-temperature cooling water is sent from the expansion tank 20 and the make-up water tank 21 to replace the cooling water. The replaced cooling water cools the phase change material pack, causing a phase change from liquid to solid. The time for which the cooling water in the cooling water pipes is replaced is set by a timer as a third set time, the drain valve 41 is closed, and the phase change material cooling process is completed.

[0093] To achieve this, the control device 23 controls the drain valve 41 to open after stopping the pump, and controls the drain valve 41 to be kept open for a set time (here, a third set time). This allows the cooling of the phase change material from the inside to be promoted by replacing the water with low-temperature cooling water, shortens the phase change time from liquid to solid, and prepares for the next operation even in an operation in which the pump is started and stopped frequently.

[0094] <Modification> The drain valve 41 may be an electric valve or a solenoid valve. In the cooling mode, the control device 23 may open the drain valve until the temperature obtained from a thermocouple or temperature sensor provided in the coolant pack (e.g., inserted or provided on the surface) becomes the same as the outside air temperature, and when the temperatures become the same, it may issue a signal to close the drain valve 41 and end the cooling process. Air bleed valves may also be used in areas where air pockets may form. The control device 23 may operate only the circulating water pump 15 provided in the engine 11 to fill the piping with cooling water.

[0095] <Third embodiment: separate radiator> 14 is a schematic diagram of the pump equipment in the third embodiment when a separate radiator is used. In the pump equipment 1c in the third embodiment, the in-pipe cooler 22 is changed to a separate radiator 44, as compared with the pump equipment 1 in the first embodiment. The separate radiator 44 is connected to the discharge port of the cooling water pipe P7 and to the suction port of the cooling water pipe P12. The cooling water pipe P11 is branched from the cooling water pipe P7 and extends to be connected to the expansion tank 20. As a result, the cooling water is supplied from the expansion tank 20 to the separate radiator 44 via the cooling water pipes P11 and P8.

[0096] The separate radiator 44 includes an electric motor 441 and a fan 442 driven by the electric motor 441. The separate radiator 44 cools the cooling water that flows in from the cooling water pipe P7 with air blown from the fan 442, and discharges the cooled cooling water to the suction port of the cooling water pipe P12. The cooling water is supplied to the engine 11 through the cooling water pipe P12 and the cooling water pipe P2.

[0097] Cooling material 31 is provided on at least a part of the outer periphery of cooling water pipe P15, cooling water pipe P5 coming out from engine 11, cooling water pipe P6 coming out from cooling component 17 of reduction gear 12, and cooling water pipe P7, and specifically, for example, may be covered (for example, wrapped) with cooling material 31. Specifically, for example, inside a building, the entire outer periphery of cooling water pipe P7 may be covered with cooling material.

[0098] <Fourth embodiment: Cooling tower> FIG. 15 is a schematic diagram of the pump equipment in the fourth embodiment when a cooling tower is used. In the pump equipment 1d in the fourth embodiment, the in-pipe cooler 22 is replaced with a cooling tower 45, as compared with the pump equipment 1 in the first embodiment, and the pump equipment 1d includes a water tank 70. The water tank 70 includes a cold water tank 71 and a hot water tank 72. A cooling water pipe P21 communicating with the cold water tank 71 is provided, and the cooling water pipe P21 branches into a cooling water pipe P2 and a cooling water pipe P3. The cooling water pipe P21 includes a circulating water pump 51 for circulating the cooling water, an electric motor 52 for driving the circulating water pump, a discharge valve 53, and a check valve 54. A cooling water pipe P13 communicating with the hot water tank 72 is provided, and the cooling water pipe P13 includes a circulating water pump 61 for circulating the cooling water, an electric motor 62 for driving the circulating water pump, a discharge valve 63, and a check valve 64. A coolant is provided (for example, wrapped) around at least a part of the outer periphery of the cooling water pipe P13. Specifically, for example, inside a building, the entire outer periphery of the cooling water pipe P13 extending from the water tank 70 may be covered with the coolant 33.

[0099] The cooling tower 45 communicates with the discharge port of the cooling water pipe P13 and with the suction port of the cooling water pipe P14. The cooling water pipe P14 is communicated with the cold water tank 71. The cooling tower 45 has a fan 451, and takes in outside air with the fan 451 to cool the cooling water, performs heat exchange using the heat of vaporization, and discharges the air that has absorbed the heat to the outside. As a result, the high-temperature cooling water supplied from the hot water tank 72 is cooled by the cooling tower 45, and the cooled cooling water is supplied to the cold water tank 71.

[0100] FIG. 16 is a flowchart showing an example of the stopping step in the third or fourth embodiment. (Step S310) The control device 23 stops the engine 11 and closes an engine stop valve (not shown).

[0101] (Step S320) The control device 23 detects a decrease in the engine 11 speed.

[0102] (Step S330) The control device 23 sets a first set time (for example, 30 seconds) in a built-in timer (not shown).

[0103] (Step S340) When the timer reaches the first set time, the control device 23 stops the engine 11 and closes the engine stop valve until the timer reaches the first set time.

[0104] (Step S350) In parallel with step S330, the control device 23 sets a second set time (for example, 180 seconds) in the timer.

[0105] (Step S360) When the timer reaches the second set time, the control device 23 stops the engine lubricating oil pump (not shown).

[0106] (Step S365) When the timer reaches the second set time, the control device 23 stops the reducer lubricating oil pump (not shown).

[0107] (Step S370) The control device 23 resets the lamp indicating "stopped", thereby turning off the lamp indicating "stopped".

[0108] (Step S380) Here, as an example, a description will be given of a case in which a thermocouple or a temperature sensor is provided in the coolant pack (for example, inserted or provided on the surface). The controller 23 determines whether the temperature of the phase change material (ie, the coolants 31, 33) is below a specified temperature.

[0109] If the temperature of the phase change material is equal to or lower than the specified temperature in step S380, the control device 23 resets and turns off the lamp indicating that the phase change material is in the cooling process (step S390). The cooler (separate radiator 44 or cooling tower 45) is stopped (step S400), and the circulating water pumps 51, 61 and / or circulating water pump 15 are stopped (step S410).

[0110] (Step S420) Next, for example, the control device 23 detects the flow relays 16 and 18 of the cooling water.

[0111] (Step S430) For example, the control device 23 resets and turns off the lamp indicating "cooling water flow."

[0112] When the pump 14 and the engine 11 are stopped, the process proceeds to the phase change material cooling process, where only the cooler (e.g., the separate radiator 44 or the cooling tower 45) and the circulating water pumps 15, 51, and 52 continue to operate, and the cooling water is sent to the cooling water piping. The packs of the coolants 31, 32, and 33 are cooled by the cooling water, and undergo a phase change from liquid to solid. When the temperature obtained from the thermocouple or temperature sensor inserted in the packs of the coolants 31, 32, and 33 becomes the same as the outside air temperature, the control device 23 transmits a signal to stop the operation of the cooler (e.g., the separate radiator 44 or the cooling tower 45) and the circulating water pumps 15, 51, and 52, and the phase change material cooling process ends.

[0113] In this way, the control device 23 may control the operation of the fan of the separate radiator 44 or the cooling tower 45 and the circulating water pumps 15, 51, 52 to continue until the cooling water temperature drops to a set temperature at which the phase change material changes from liquid to solid. This configuration can promote cooling from the inside of the phase change material and shorten the phase change time from liquid to solid, so that even in an operation in which the pump is started and stopped frequently, it is possible to prepare for the next operation.

[0114] The length of the phase change material cooling process can be controlled by the temperature of the phase change material alone so that it remains below a specified temperature, or by using a timer to control the time. The control panel that performs the control can be a PLC (Programmable Logic Controller) housed in the control panel, which can be used for software control, or a relay, which can be used for hardware control.

[0115] <Modification> A coolant may be provided (for example, wound) on the cooling water piping of the reducer. Also, a coolant may be provided (for example, wound) on the cooling water piping of the pump external bearing (thrust bearing). The prime mover may be an electric motor, and a coolant may be provided (for example, wound) on a cooling water pipe of the electric motor. The pump 14 is not limited to a vertical shaft pump, but may be a horizontal shaft pump. When a fluid coupling is employed, a coolant may be provided (eg, wound) on the cooling water piping of the fluid coupling.

[0116] In addition to the cooling water pipes, the coolant may be provided (for example, wrapped) around the lubricating oil pipes of the bearings or the like.

[0117] As described above, the present invention is not limited to the above-described embodiment as it is, and in the implementation stage, the components can be modified and embodied without departing from the gist of the invention. In addition, various inventions can be formed by appropriately combining the multiple components disclosed in the above-described embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components from different embodiments may be appropriately combined. [Explanation of symbols]

[0118] 1. Pump equipment 11 Engine 12 Reducer 13 Hydraulic clutch 14 Pump 15 Circulating water pump 16 Flow Relay 17 Cooling parts 18 Flow Relay 19 Temperature control valve 20 Expansion tank 21 Refill tank 22 Pipe Cooler 23 Control device 31, 32, 32a, 32b, 32b1, 32b2, 32c1 Coolant 321 First phase change material layer 322 Second phase change material layer 323 Third phase change material layer 324 4th phase change material layer 33a, 33b Mounting members 34 Mounting material 35 Inner layer 36 Outer layer 41 Drain valve 42 Suction tank 43 In-tank cooler 44 Separate radiator 441 Electric motor 442 Fans 45 Cooling Tower 451 Fans 51 Circulating water pump 52 Electric motor 53 Discharge valve 54 Check valve 61 Circulating water pump 62 Electric motor 63 Discharge valve 64 Check valve 70 Aquarium 71 Cold water tank 72 Hot water tank P1~P15 Cooling water piping

Claims

1. A heat source device; a cooling water pipe through which cooling water for cooling the heat source device flows; A cooler that cools the cooling water; A coolant provided on at least a part of the outer periphery of the cooling water pipe; A pump facility comprising:

2. The cooling water piping includes a first piping provided between the heat source device and the cooler, and a second piping provided between the cooler and a confluence point of the return water and the inflow water, The coolant is provided around the first pipe and / or around the second pipe. The pump installation according to claim 1.

3. The coolant comprises a phase change material. The pump installation according to claim 1 or 2.

4. The coolant is wrapped in a sealed container and formed into a band, The coolant is wound around the cooling water pipe in a circumferential or spiral manner, or is provided so as to be in close contact with the cooling water pipe along the longitudinal direction. The pump installation according to claim 1 or 2.

5. The coolant is formed of a plurality of phase change materials having different melting points in layers, Among the plurality of phase change materials, a first phase change material on a surface side contacting the cooling water pipe has a lower melting point than a second phase change material. The pump installation according to claim 1 or 2.

6. The plurality of phase change materials are thicker on the outer side than on the side in contact with the cooling water pipe. The pump installation according to claim 5.

7. The material of the inner peripheral surface of the coolant has a higher thermal conductivity than the material of the outer peripheral surface of the coolant. The pump installation according to claim 1 or 2.

8. The cooler is a pipe cooler or a tank cooler, a drain valve provided in the cooling water pipe for discharging the cooling water in the cooling water pipe; a control device that controls the drain valve to open after the pump is stopped and to maintain the drain valve in an open state for a set time; The pump installation according to claim 1 or 2, comprising:

9. The cooler is a separate radiator or a cooling tower, A circulating water pump that circulates the cooling water; a control device that controls the operation of the fan of the separate radiator or cooling tower and the circulating water pump to continue after the pump is stopped until the cooling water temperature drops to a set temperature at which a phase change material changes from a liquid phase to a solid phase; The pump installation according to claim 1 or 2, comprising:

10. The heat source device is a driving machine and / or a reduction gear. The pump installation according to claim 1 or 2.

11. The driving machine is an engine or an electric motor. A pump installation according to claim 10.

Images