JP6696226B2 - Heat pump type steam generator - Google Patents

Description

  The present invention relates to a heat pump steam generator that recovers heat from hot water to generate steam.

As one of the steam generators, there is a heat pump type steam generator that recovers heat from hot water such as factory wastewater and waste hot water such as used cooling water (see Patent Document 1, for example). The heat pump type steam generator makes the evaporator of the heat pump function as an exhaust heat recovery device, where heat is recovered from the hot water that is the heat source into the refrigerant, and the recovered heat is used to heat the water to be heated by the condenser. Since the steam is generated in this manner, there is an advantage that the running cost and the amount of CO ₂ emission can be reduced as compared with a combustion-type steam generator that generates steam by using a boiler facility or the like. At this time, the heat-source hot water whose exhaust heat is recovered by the evaporator has a temperature of, for example, about 70 ° C., but is discharged to the outside as it is.

JP 2012-247146 A

  By the way, in the compressor used in such a heat pump unit, when the temperature becomes too high during operation, the oil enclosed inside is deteriorated or the deterioration of resin parts and rubber parts provided inside is accelerated. On the other hand, if the temperature becomes too low during the stop, the start-up time may increase. In particular, the compressor of the heat pump type steam generator as described above needs to generate a high temperature refrigerant for steam generation, and the internal temperature tends to rise easily.

  The present invention has been made in view of the above problems of the conventional art, and an object of the present invention is to provide a heat pump type steam generator capable of maintaining the temperature of a compressor near a temperature suitable for its operation.

  The heat pump type steam generator according to the present invention is a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, an expansion mechanism that decompresses the refrigerant that has exited the condenser, and recovery from hot water. A heat pump unit that annularly connects an evaporator that evaporates a refrigerant with the heat, a heated water is supplied to the condenser, and a steam generation unit that heats the heated water by the refrigerant to generate steam, and A hot water supply path for supplying hot water to the evaporator, a drainage supply path for discharging hot water from the evaporator, and an exhaust heat supply section for supplying heat of the hot water discharged to the drainage supply path to the compressor. It is characterized by being provided.

  With such a configuration, the heat of the heat source hot water exiting the evaporator, which is conventionally discharged to the outside after recovering the exhaust heat by the evaporator, is supplied to the compressor by the exhaust heat supply unit. Therefore, the compressor can be maintained near the temperature suitable for its operation regardless of whether the apparatus is operating or stopped.

  The exhaust heat supply unit may be configured to supply the heat of the hot water to the compressor in order to heat and cool the compressor.

  The exhaust heat supply unit may be configured to supply the heat of the hot water to the compressor in order to heat the compressor when the device is activated and to cool the compressor during normal operation. That is, for example, in the case of the heat pump steam generator, if the temperature of the hot water supplied to the evaporator from the hot water supply path is about 80 ° C, the temperature of the hot water discharged from the evaporator to the drainage supply path is 70 ° C. The temperature of the compressor during operation is about 100 ° C. Therefore, during operation of the device, the compressor can be appropriately cooled by the hot water discharged from the evaporator via the exhaust heat supply unit. On the other hand, when the apparatus is stopped, the compressor can be appropriately kept warm by the hot water discharged from the evaporator via the exhaust heat supply unit.

  The exhaust heat supply unit includes a compressor heat exchanger that is disposed in contact with the compressor casing and is supplied with the hot water discharged from the drainage supply path, and the compressor heat exchanger. Then, heat exchange may be performed between the hot water flowing through the drainage supply path and the casing. As a result, the heat of the hot water discharged from the evaporator can be directly and efficiently transferred to the compressor, and high cooling efficiency and high heat retention efficiency can be obtained.

  The compressor may be mounted on the upper surface of the compressor heat exchanger. Then, heat can be efficiently exchanged between the compressor and the heat exchanger for the compressor.

  The exhaust heat supply unit heats the compressor before and / or at the time of starting the compressor, and cools the compressor during normal operation of the compressor in order to cool the heat of the hot water. It may be configured to supply to the compressor. Then, the compressor can be appropriately cooled and heated.

  The exhaust heat supply unit is for selectively supplying heat to the oil, and the exhaust heat supply unit is provided in an oil circulation path for circulating the oil and the oil circulation path, An oil heat exchanger to which the discharged hot water is supplied is provided, and in the oil heat exchanger, heat exchange is performed between the hot water flowing through the drainage supply path and the oil flowing through the oil circulation path. It may be.

  The oil circulation path and the oil heat exchanger may be provided outside the casing of the compressor.

  The exhaust heat supply unit is provided in the drainage supply path, and radiates heat to radiate the hot water flowing through the drainage supply path, and a blower that supplies air passing through the heat dissipation heat exchanger to the compressor. A configuration including a fan may be used. Then, it is possible to constantly blow the air of a constant temperature using the heat of the hot water to the compressor to appropriately cool and heat the compressor.

  The blower fan may be configured to blow the air to the outer peripheral surface of the casing of the compressor.

  The compressor is an open type compressor in which a rotating shaft that passes through an outer wall surface of the housing and projects to the outside of the housing is rotationally driven by an external drive source, and the blower fan is a housing of the compressor. It may be configured such that air can be blown toward a shaft seal portion that hermetically seals between the shaft insertion hole provided in the and the rotary shaft. Then, it becomes possible to keep the shaft seal portion, which is particularly vulnerable to heat, at an appropriate temperature.

  The blower fan may be configured to blow the air inside the casing of the compressor.

  The exhaust heat supply unit may be configured to supply the hot water, the heat of which has been absorbed by the compressor, to the evaporator again. Then, the utilization efficiency of the heat source hot water is improved, and for example, the heat pump steam generator can be operated with high heat efficiency even in an installation environment where the supply amount of the heat source hot water is small.

  According to the present invention, the heat of the heat source hot water exiting the evaporator, which has been conventionally discharged to the outside after recovering the exhaust heat by the evaporator, is supplied to the compressor by the exhaust heat supply unit. Therefore, the compressor can be maintained near the temperature suitable for its operation regardless of whether the apparatus is operating or stopped.

It is a block diagram which shows typically the circuit structure of the heat pump steam generator which concerns on the 1st Embodiment of this invention. FIG. 3 is a side sectional view schematically showing the internal structure of the device housing. It is a plane sectional view which shows typically the internal structure of an apparatus housing. It is a perspective view which shows the structure of the heat exchanger for compressors typically. It is a plane sectional view showing typically the internal structure of the device case in the heat pump type steam generator concerning a 2nd embodiment. It is a plane sectional view showing typically the internal structure of the device case in the heat pump type steam generator concerning a 3rd embodiment. It is a side sectional view which showed typically the important section in the heat pump type steam generator concerning a 4th embodiment. It is a figure which shows the modification of the heat pump steam generator shown in FIG. It is a figure which shows another modification of the heat pump type | formula steam generator shown in FIG.

  Hereinafter, a heat pump type steam generator according to the present invention will be described in detail with reference to the accompanying drawings, with reference to preferred embodiments.

  FIG. 1 is a configuration diagram schematically showing a circuit structure of a heat pump steam generator 10 according to a first embodiment of the present invention. The heat pump steam generator 10 is a system that generates steam using waste heat recovered from hot water such as factory wastewater, and the generated steam is sent to an external steam utilization facility such as a dryer or a sterilizer.

  First, a configuration example of the circuit structure of the heat pump steam generator 10 will be described.

  As shown in FIG. 1, the heat pump steam generator 10 evaporates water to generate steam and sends heat to the outside from a steam generator 12 and hot water (heat source hot water) supplied by a hot water supply path 14. Is provided and a heat pump unit 16 that supplies this heat as a heat source for steam generation in the steam generation unit 12 and a control unit 18 that controls the system. The steam generation unit 12, the heat pump unit 16, and the control unit 18 are housed inside a device casing 20 formed in, for example, a rectangular parallelepiped shape.

  The heat pump unit 16 includes a compressor 21 that compresses a refrigerant, a condenser 22 that condenses the refrigerant compressed by the compressor 21, an expansion mechanism 24 that decompresses the refrigerant that has exited the condenser 22, and heat is recovered from hot water. This is a refrigeration cycle device in which an evaporator 26 for evaporating a refrigerant is connected in an annular shape using a refrigerant pipe 27 to circulate the refrigerant. In the present embodiment, a heater 28 for preheating the feed water is connected between the outlet side of the condenser 22 and the inlet side of the expansion mechanism 24. The expansion mechanism 24 is, for example, an electronic expansion valve, and its opening can be adjusted under the control of the controller 18. The control unit 18 may be implemented, for example, by causing a processing device such as a CPU (Central Processing Unit) to execute a program, that is, by software, or by hardware such as an IC (Integrated Circuit). Alternatively, it may be realized by using software and hardware in combination.

  The refrigerant that has been compressed by the compressor 21 and has become high temperature and high pressure exchanges heat with the water circulating in the steam generating unit 12 in the condenser 22 and is cooled and condensed. The refrigerant discharged from the condenser 22 is preheated by the heater 28 to preheat the water flowing through the water supply pipe 30a, and further cooled, and then adiabatically expanded by the expansion mechanism 24, and absorbs heat from the hot water flowing through the hot water supply path 14 at the evaporator 26. Then, it evaporates and returns to the compressor 21. Under the control of the control unit 18, the operating speed of the compressor 21 is controlled via the inverter based on the pressure and temperature of the refrigerant on the suction side and the discharge side. The suction side and the discharge side of the compressor 21 are connected by a bypass pipe 27a provided with a solenoid valve 29. The electromagnetic valve 29 is controlled to be closed during normal operation of the heat pump steam generator 10 and is controlled to be opened by the control unit 18 at startup. This can shorten the start-up time while preventing the liquid compression at the start-up of the compressor 21. The bypass pipe 27a may be omitted.

  The steam generation unit 12 uses a refrigerant circulating in the heat pump unit 16 as a heat source to evaporate water to generate steam, and a vapor-liquid two-phase flow containing steam and water generated in the condenser 22 as steam. A steam separator 31 for separating into water, a circulation pipe 30b for introducing the water separated by the steam separator 31 into the water to be heated supplied from the water supply pipe 30a and introducing the water into the condenser 22, and a condenser 22 A steam pipe 30c for guiding the gas-liquid two-phase flow to the steam separator 31 and a delivery pipe 30d for sending the steam separated by the steam separator 31 to an external steam utilizing facility.

  The water vapor separator 31 is composed of a cylindrical container along the vertical direction, and water is stored in the container by supplying water from a water supply pipe 30a connected to a circulation pipe 30b connected to a lower end wall. .. The water supply pipe 30a introduces water (heated water) from a water pipe or a water tank (not shown) to the circulation pipe 30b by the water supply pump 32. The operation of the water supply pump 32 is controlled by the control unit 18. The circulation pipe 30b is a path that connects the lower end wall of the water vapor separator 31 to the condenser 22. The steam pipe 30c is a path through which the condenser 22 and the upper side wall of the water vapor separator 31 communicate with each other and through which a gas-liquid two-phase flow flows.

  The delivery pipe 30d is a path that is connected to the upper end wall of the steam separator 31 and is supplied from the steam pipe 30c into the steam separator 31 and sends out the steam after water is separated therein to the outside. The delivery pipe 30d is provided with a pressure adjustment valve 34 that controls the flow rate and pressure of the steam sent out from the heat pump steam generator 10 by appropriately adjusting the opening thereof under the control of the control unit 18. Has been.

  In the steam generator 12, water is supplied from the steam separator 31 to the condenser 22 through the circulation pipe 30b due to the difference in height between the water surface of the steam separator 31 and the water surface of the condenser 22, and the condenser 22 is also supplied. A steam siphon circuit is formed in which the steam generated in 1 is sent from the steam pipe 30c to the sending pipe 30d via the steam separator 31. As a result, water can be circulated without providing a power source such as a circulation pump in the water circulation system formed by the circulation pipe 30b, the steam pipe 30c, and the water vapor separator 31. Hereinafter, the water supply pipe 30a, the circulation pipe 30b, the steam pipe 30c, and the delivery pipe 30d, through which water flows while changing its phase from a liquid phase to a gas phase, may be collectively referred to as a water pipe 30.

  The hot water supply path 14 is a pipe for supplying hot water to the evaporator 26, and is provided with a hot water pump (not shown) that sends hot water supplied from a hot water supply source such as an external hot water tank at a predetermined flow rate. The hot water exiting the evaporator 26 is selectively branched into two by a three-way valve 35. One drainage supply path 36 branched by the three-way valve 35 is a pipe connected to an exhaust heat supply unit 38 installed near the compressor 21. The other drainage path 39 branched by the three-way valve 35 is a pipe for discharging hot water to the outside. The three-way valve 35 and the drainage route 39 may not be provided, and all the drainage discharged from the evaporator 26 may flow from the drainage supply route 36 to the exhaust heat supply unit 38. Further, a circulation path 40 may be provided to return the hot water that has exited the exhaust heat supply unit 38 to the hot water supply path 14 again.

  FIG. 2 is a side sectional view schematically showing the internal structure of the device housing 20, and FIG. 3 is a plan sectional view schematically showing the internal structure of the device housing 20.

  As shown in FIGS. 2 and 3, the device housing 20 has a box-like structure installed on the ground or floor through the legs 41. The device housing 20 can be opened and closed by a door 42 provided on the front surface, while five surfaces (top surface, bottom surface, back surface, left and right side surfaces) other than the front surface are closed by a panel 43. Inside the apparatus casing 20, each device, pipe, and the like that configure the steam generation unit 12 and the heat pump unit 16 are housed. On the outer surface of the door 42, an operation panel 44a that is operated by the operator when performing various settings, operation commands, and the like for the control unit 18 of the heat pump steam generator 10 is provided. On the inner surface of the door 42, an electrical equipment box 44 accommodating various electrical components forming the control unit 18 is attached.

  In the heat pump unit 16, a compressor 21 and a motor 21 a for driving the compressor 21 are arranged side by side on the bottom surface of the device housing 20 along the front side (door 42 side), and the condenser 22 of the device housing 20. It is arranged on the bottom surface on the back surface side of the compressor 21. The evaporator 26 and the heater 28 are arranged above the bottom surface of the apparatus housing 20 side by side using a beam member or the like. In the plan view shown in FIG. 3, the evaporator 26 is located on the back side of the motor 21 a and the heater 28 is located on the side of the evaporator 26. In the present embodiment, the open-type compressor 21 in which the power from the separate motor 21a is transmitted via the belt 45 and the pulley 21b is used. The compressor 21 may have a closed structure in which a motor 21a is integrally incorporated.

  In the steam generator 12, the steam separator 31 is disposed above the bottom surface of the device housing 20 using a beam member or the like, and is located above the condenser 22. In the plan view shown in FIG. 3, the water vapor separator 31 is located on the back side of the compressor 21 and on the side of the heater 28.

  The exhaust heat supply unit 38 is installed on the bottom surface of the device housing 20, and has a plate-shaped compressor heat exchanger 46 on which the compressor 21 is mounted. The heat exchanger 46 for the compressor is connected to the drainage supply path 36 from the evaporator 26 on the inlet side, and is connected to the drainage path 47 or the circulation path 40 for discharging hot water to the outside of the apparatus on the outlet side ( (See also Figure 1). A three-way valve may be installed between the drainage path 47 and the circulation path 40 to allow hot water to selectively flow through the drainage path 47 or the circulation path 40.

  FIG. 4 is a perspective view schematically showing the configuration of the compressor heat exchanger 46.

  As shown in FIG. 2, the compressor heat exchanger 46 is a heat exchanger that functions as a base plate that supports the compressor 21 on the bottom surface of the device housing 20. The compressor heat exchanger 46 is, for example, a fin-and-tube heat exchanger in which fins are interposed between the meandering flow paths 46a.

  The heat exchanger 46 for a compressor is placed in contact with the housing 21c of the compressor 21 by mounting the compressor 21 on the upper surface thereof. As a result, the compressor heat exchanger 46 can perform heat exchange between the hot water flowing into the flow path 46 a from the drainage supply path 36 and the housing 21 c of the compressor 21.

  As described above, the heat pump steam generator 10 according to the present embodiment includes the hot water supply path 14 for supplying hot water to the evaporator 26 of the heat pump unit 16, the drainage supply path 36 for discharging hot water from the evaporator 26, An exhaust heat supply unit 38 that supplies the heat of the hot water discharged to the drainage supply path 36 to the compressor 21.

  Therefore, in the heat pump steam generator 10, the heat of the heat source hot water discharged from the evaporator 26, which is conventionally discharged to the outside after recovering the exhaust heat by the evaporator 26, is supplied to the compressor 21 by the exhaust heat supply unit 38. can do. Therefore, the compressor 21 can be maintained near the temperature suitable for its operation regardless of whether the apparatus is operating or stopped.

  That is, for example, in the case of the heat pump steam generator 10, the temperature of the hot water supplied from the hot water supply path 14 to the evaporator 26 is about 80 ° C., and the temperature of the hot water discharged from the evaporator 26 to the drainage supply path 36. Is about 70 ° C., and the temperature of the casing 21c of the compressor 21 during operation is about 100 ° C. Therefore, when the apparatus is operating, the compressor 21 can be appropriately cooled by the hot water discharged from the evaporator 26 via the exhaust heat supply unit 38. As a result, it is possible to prevent the temperature of the casing 21c of the compressor 21 from becoming excessively high (for example, 120 ° C. or higher) during operation and causing deterioration of the internal resin parts and the like. On the other hand, when the apparatus is stopped (before starting), the compressor 21 can be appropriately kept warm by the hot water discharged from the evaporator 26 via the exhaust heat supply unit 38. As a result, the temperature of the casing 21c of the compressor 21 becomes normal temperature (for example, 25 ° C. or lower) during the operation stop, and the viscosity of the oil enclosed therein increases, causing a malfunction due to insufficient lubrication of the oil at the next startup. It is possible to avoid problems such as occurrence of an error and increase in startup time. In addition, since the compressor 21 is already in a state of being properly kept warm at the time of startup and is further heated by hot water, the effect of shortening the startup time can be obtained.

  In other words, the exhaust heat supply unit 38 has a function of supplying the heat of the hot water for heating and cooling the compressor 21 to the compressor 21, and specifically, before starting and at the time of starting the compressor 21. Heats the compressor 21 and supplies the heat of the hot water to the compressor 21 in order to cool the compressor 21 during normal operation. If the exhaust heat supply unit 38 heats the compressor 21 at least before and during startup of the compressor 21, the effect of preventing oil lubrication failure and the effect of shortening the startup time can be obtained. As described above, in the heat pump steam generator 10, the hot water serving as the heat source can be used as the heat retaining water or the cooling water for the compressor 21, and high thermal efficiency can be obtained.

  The exhaust heat supply unit 38 of the heat pump steam generator 10 is disposed in contact with the casing 21c of the compressor 21, and includes a compressor heat exchanger 46 to which the hot water discharged from the drainage supply path 36 is supplied. In the compressor heat exchanger 46, heat is exchanged between the hot water flowing through the drainage supply path 36 and the housing 21c. As a result, the heat of the hot water discharged from the evaporator 26 can be directly and efficiently transferred to the compressor 21, and high cooling efficiency and high heat retention efficiency can be obtained.

  In the heat pump steam generator 10, the compressor 21 is mounted on the upper surface of the compressor heat exchanger 46. Therefore, heat can be efficiently exchanged between the compressor 21 and the compressor heat exchanger 46. Further, generally, the oil chamber under the housing 21c of the compressor 21 can be efficiently cooled or kept warm by the compressor heat exchanger 46.

  Note that, for example, the hot water that has passed through the exhaust heat supply unit 38 during the operation of the heat pump steam generator 10 receives the heat from the compressor 21 and the temperature at which the exhaust heat can be recovered by the evaporator 26 again (for example, about 80 ° C.). May be heated up to. Therefore, it is possible to return the hot water whose temperature has risen by passing through the exhaust heat supply unit 38 to the hot water supply path 14 again from the circulation path 40 described above. Thereby, the utilization efficiency of the heat source hot water is improved, and for example, the heat pump steam generator 10 can be operated with high heat efficiency even in an installation environment where the supply amount of the heat source hot water is small.

  FIG. 5 is a plan sectional view schematically showing the internal structure of the device casing 20 in the heat pump steam generator 10A according to the second embodiment. In the heat pump steam generator 10A according to the second embodiment, elements having the same or similar functions as those of the heat pump steam generator 10 according to the first embodiment described above are designated by the same reference numerals. The detailed description thereof is omitted, and the same applies to heat pump type steam generators 10B to 10C according to third to fourth embodiments described later.

  As shown in FIG. 5, the heat pump steam generator 10A according to the second embodiment has an exhaust heat supply different in configuration from the exhaust heat supply unit 38 of the heat pump steam generator 10 according to the first embodiment described above. The unit 38A is provided. Reference numeral 48 in FIG. 5 is a base plate on which the compressor 21 is mounted, and does not have a function as a heat exchanger like the compressor heat exchanger 46 shown in FIG.

  The exhaust heat supply unit 38A includes an oil circulation path 50 that circulates the oil of the compressor 21, and an oil heat exchanger 52 that is provided in the oil circulation path 50 and to which the hot water discharged from the drainage supply path 36 is supplied. .. The oil circulation path 50 circulates the oil enclosed in the casing 21c of the compressor 21 to the oil heat exchanger 52 of the casing 21c by the power of the oil pump 54, and removes the oil discharged from the oil heat exchanger 52. It is a route for returning the inside of the housing 21c again. The oil heat exchanger 52 is a heat exchanger that exchanges heat between the hot water flowing through the drainage supply path 36 and the oil flowing through the oil circulation path 50.

  Therefore, in the heat pump steam generator 10A, the heat of the heat source hot water discharged from the evaporator 26, which has been conventionally discharged to the outside after recovering the exhaust heat by the evaporator 26, heats the heat of the compressor 21 by the exhaust heat supply unit 38A. Can be supplied to. Therefore, as in the case of the heat pump steam generator 10 according to the first embodiment described above, it is possible to keep the compressor 21 near a temperature suitable for its operation regardless of whether the device is operating or stopped. it can.

  That is, for example, the temperature of the oil in the housing 21c of the compressor 21 during operation of the heat pump steam generator 10A is about 90 to 95 ° C. Therefore, when the apparatus is in operation, the oil in the compressor 21 can be appropriately cooled with hot water via the exhaust heat supply unit 38A. Further, when the apparatus is stopped, the oil of the compressor 21 can be appropriately kept warm with hot water via the exhaust heat supply unit 38A.

  In the heat pump steam generator 10A, since the oil circulation path 50 and the oil heat exchanger 52 are provided outside the casing 21c of the compressor 21, the device configuration can be simplified. The oil heat exchanger 52 may be provided in the housing 21c and the hot water from the drainage supply path 36 may be supplied to the oil heat exchanger 52.

  FIG. 6 is a plan sectional view schematically showing the internal structure of the device housing 20 in the heat pump steam generator 10B according to the third embodiment.

  As shown in FIG. 6, the heat pump steam generator 10B according to the third embodiment has an exhaust heat supply different in configuration from the exhaust heat supply unit 38 of the heat pump steam generator 10 according to the first embodiment described above. The unit 38B is provided.

  The exhaust heat supply unit 38B has a cylinder head heat exchanger 60 provided around the cylinder head 21d of the compressor 21. The cylinder head heat exchanger 60 is installed so as to surround the cylinder head 21d of the compressor 21 and a portion excluding the compression chamber (not shown). The cylinder head heat exchanger 60 is a heat exchanger that exchanges heat between the hot water flowing through the drainage supply path 36 and the cylinder head 21d.

  Therefore, in the heat pump steam generator 10B, the heat of the heat source hot water discharged from the evaporator 26, which is conventionally discharged to the outside after the exhaust heat is recovered by the evaporator 26, is transferred to the cylinder of the compressor 21 by the exhaust heat supply unit 38B. It can be supplied to the head 21d. Therefore, as in the case of the heat pump steam generator 10 according to the first embodiment described above, it is possible to keep the compressor 21 near a temperature suitable for its operation regardless of whether the device is operating or stopped. it can.

  That is, for example, the temperature of the cylinder head 21d of the compressor 21 during operation of the heat pump steam generator 10B is close to the refrigerant discharge temperature (for example, about 130 ° C.). Therefore, during operation of the device, the cylinder head 21d of the compressor 21 can be appropriately cooled with hot water via the exhaust heat supply unit 38B. Further, when the apparatus is stopped, the cylinder head 21d of the compressor 21 can be appropriately kept warm with hot water via the exhaust heat supply unit 38B.

  FIG. 7 is a side sectional view schematically showing a main part of a heat pump steam generator 10C according to the fourth embodiment.

  As shown in FIG. 7, the heat pump steam generator 10C according to the fourth embodiment has a different exhaust heat supply configuration from the exhaust heat supply unit 38 of the heat pump steam generator 10 according to the first embodiment. The unit 38C is provided.

  The exhaust heat supply unit 38C is provided in the drainage supply path 36 and supplies the heat radiation heat exchanger 70 that radiates the hot water flowing through the drainage supply path 36, and the air that has passed through the radiation heat exchanger 70 to the compressor 21. And a blower fan 72. The blower fan 72 has a configuration in which blades are provided on the outer peripheral surface of a rotating shaft (crankshaft) 21f that passes through the outer wall surface 21e of the housing 21c of the compressor 21 and projects outside the housing 21c. The blower fan 72 is provided to be able to blow air toward a shaft seal portion 21h that hermetically seals between a shaft insertion hole 21g provided in the housing 21c of the compressor 21 and the rotary shaft 21f.

  In such a heat pump steam generator 10C, the outside air A sucked by the blower fan 72 passes through the heat radiating heat exchanger 70 and also passes through the opening and the periphery of the pulley 21b and is blown to the shaft seal portion 21h. .. Therefore, the heat of the heat source hot water discharged from the evaporator 26, which was conventionally discharged to the outside after the exhaust heat is recovered by the evaporator 26, is supplied to the casing 21c of the compressor 21 and the shaft seal portion 21h by the exhaust heat supply unit 38C. Can be supplied. Therefore, as in the case of the heat pump steam generator 10 according to the first embodiment described above, the compressor 21 and its shaft seal portion 21h are suitable for its operation regardless of whether the apparatus is operating or stopped. Can be kept near temperature.

  In particular, the shaft seal portion 21h of the compressor 21, which is an open type structure, has a problem of abrasion, and this portion is particularly vulnerable to heat. Therefore, the shaft seal portion 21h is maintained at an appropriate temperature by passing through the heat radiating heat exchanger 70 and by blowing with the outside air A adjusted to the same temperature as hot water (for example, about 70 ° C.). Is possible.

  In the heat pump steam generator 10C, since the blower fan 72 is provided integrally with the rotary shaft 21f, separate power for driving the blower fan 72 becomes unnecessary. Of course, the blower fan 72 may not be provided integrally with the rotary shaft 21f, but may be arranged, for example, between the heat radiation heat exchanger 70 and the pulley 21b (see the blower fan 72 shown by the two-dot chain line in FIG. 7). ). Then, even when the operation of the compressor 21 is stopped, the blower fan 72 can keep the temperature of the compressor 21 by blowing air. As shown in FIG. 8, the blower fan 72 may be integrated into the inner circumference of the pulley 21b. Further, as shown in FIG. 9, the heat dissipation heat exchanger 70 and the blower fan 72 may be mounted in the housing 21 c of the compressor 21.

  It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention can be freely modified without departing from the gist of the present invention.

  For example, the exhaust heat supply units 38 and 38A to 38C in each of the above embodiments may be used in combination of a plurality.

10, 10A to 10C Heat pump type steam generator 12 Steam generator 14 Hot water supply path 16 Heat pump unit 18 Control unit 20 Device housing 21 Compressor 21a Motor 21b Pulley 21c Housing 21d Cylinder head 21e Outer wall surface 21f Rotating shaft 21g Shaft insertion Hole 21h Shaft seal part 22 Condenser 24 Expansion mechanism 26 Evaporator 27 Refrigerant piping 28 Heater 31 Steam separator 36 Drainage supply route 38, 38A to 38C Waste heat supply part 39, 47 Drainage route 40 Circulation route 46 Heat for compressor Exchanger 50 Oil circulation path 52 Oil heat exchanger 60 Cylinder head heat exchanger 70 Heat dissipation heat exchanger 72 Blower fan

Claims (11)

A compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed by the compressor, an expansion mechanism that decompresses the refrigerant that exits the condenser, and an evaporator that evaporates the refrigerant with the heat recovered from the hot water. A heat pump part connected to
Supplying water to be heated to the condenser, a steam generation unit that heats the water to be heated by the refrigerant to generate steam,
A hot water supply path for supplying hot water to the evaporator;
A drainage supply path for discharging hot water from the evaporator,
An exhaust heat supply unit for supplying the heat of the hot water discharged to the drainage supply path to the compressor,
Equipped with
The exhaust heat supply unit supplies heat of the hot water to the compressor in order to heat and cool the compressor.
The exhaust heat supply unit heats the compressor before and / or at the time of starting the compressor, and cools the compressor during normal operation of the compressor in order to cool the heat of the hot water. heat pump vapor generating apparatus characterized that you supplied to the compressor. The heat pump steam generator according to claim 1 ,
The exhaust heat supply unit is arranged in contact with the casing of the compressor, and has a compressor heat exchanger to which hot water discharged from the drainage supply path is supplied,
In the heat exchanger for a compressor, heat exchange is performed between the hot water flowing through the drainage supply path and the casing. The heat pump type steam generator according to claim 2 ,
A heat pump steam generator, wherein the compressor is mounted on an upper surface of the compressor heat exchanger. The heat pump steam generator according to claim 1 ,
The heat pump type steam generator, wherein the exhaust heat supply unit supplies heat to at least one of an oil sealed inside the compressor and a cylinder head of the compressor. A compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed by the compressor, an expansion mechanism that decompresses the refrigerant that exits the condenser, and an evaporator that evaporates the refrigerant with the heat recovered from the hot water. A heat pump part connected to
Supplying water to be heated to the condenser, a steam generation unit that heats the water to be heated by the refrigerant to generate steam,
A hot water supply path for supplying hot water to the evaporator;
A drainage supply path for discharging hot water from the evaporator,
An exhaust heat supply unit for supplying the heat of the hot water discharged to the drainage supply path to the compressor,
Equipped with
The exhaust heat supply unit selectively supplies heat to the oil sealed inside the compressor ,
The exhaust heat supply unit has an oil circulation path for circulating the oil, and an oil heat exchanger provided in the oil circulation path and supplied with hot water discharged from the drainage supply path.
In the oil heat exchanger, a heat pump type steam generator, wherein heat is exchanged between hot water flowing through the drainage supply path and oil flowing through the oil circulation path. The heat pump steam generator according to claim 5 ,
The heat pump type steam generator, wherein the oil circulation path and the oil heat exchanger are provided outside the casing of the compressor. A compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, an expansion mechanism that decompresses the refrigerant that exits the condenser, and an evaporator that evaporates the refrigerant with the heat recovered from hot water. A heat pump part connected to
Supplying water to be heated to the condenser, a steam generation unit that heats the water to be heated by the refrigerant to generate steam,
A hot water supply path for supplying hot water to the evaporator;
A drainage supply path for discharging hot water from the evaporator,
An exhaust heat supply unit for supplying the heat of the hot water discharged to the drainage supply path to the compressor,
Equipped with
The exhaust heat supply unit is provided in the drainage supply path, and radiates heat to radiate the hot water flowing in the drainage supply path, and a blower that supplies the compressor with the air that has passed through the heat dissipation heat exchanger. A heat pump type steam generator, comprising: a fan. The heat pump type steam generator according to claim 7 ,
The heat pump type steam generating device, wherein the blower fan blows the air to an outer peripheral surface of a casing of the compressor. The heat pump steam generator according to claim 8 ,
The compressor is an open type compressor in which a rotating shaft passing through an outer wall surface of the housing and protruding to the outside of the housing is rotationally driven by an external drive source,
The heat pump type steam generator, wherein the blower fan is provided so as to blow air toward a shaft seal portion that hermetically seals between a shaft insertion hole provided in the casing of the compressor and the rotary shaft. apparatus. The heat pump steam generator according to claim 7 ,
The heat pump type steam generator, wherein the blower fan blows the air into the casing of the compressor. In heat pump type steam generating device according to claim 1-10,
The heat pump steam generator, wherein the exhaust heat supply unit supplies the hot water, the heat of which is absorbed by the compressor, to the evaporator again.

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