JP2008164204A - Heat pump system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump system capable of improving energy efficiency. <P>SOLUTION: This heat pump system comprises an evaporator 2 through which a heat source pipe conduit 20 for circulating external heat source passes, and heating and evaporating a working medium, a compressor 4 for compressing the working medium evaporated by the evaporator 2, a steam supply pipe conduit 5 for supplying the working medium compressed by the compressor 4 to heat utilization facilities 6, and an oil supply system 7 having an oil supply pipe conduit 52 connected with the compressor 4 after a lubricant of the compressor 4 is circulated and passed inside of the evaporator 2, for circulating and supplying the lubricant to the compressor 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat pump system that uses a working medium compressed by a compressor as a heat source.

  In some heat pump systems, a working medium evaporated using an external heat source is compressed by a compressor, heated, and supplied to a heat utilization facility or the like. A compressor in such a system is generally supplied with lubricating oil in order to reduce energy loss in the compressor.

  For example, in a system using a turbo compressor, it is necessary to supply lubricating oil maintained at a temperature suitable for oil supply to the bearing due to problems such as vibration characteristics of the rotor of the compressor and oil film characteristics of the rotor bearing. Since the lubricating oil supplied to the bearing is heated by mechanical loss such as friction loss with the rotor (bearing loss), it must be cooled to a predetermined temperature to be supplied to the compressor again. Therefore, the heat pump system is provided with an oil supply system that circulates and supplies the heated lubricating oil to the compressor while cooling it with an oil cooler or the like.

  As a technology for cooling the lubricating oil with the oil cooler, the one that exchanges heat with the cooling water is generally used. However, a part of the working medium of the heat pump system is led to the oil cooler to be a refrigerant for the lubricating oil, and the compressor In some cases, the working medium recovers the energy of the mechanical loss generated in the bearing (see Patent Document 1).

JP-A-63-87557

  However, in the above technique, the working medium used as the refrigerant in the oil cooler is then led to the compressor. For this reason, the pressure and temperature of the working medium when introduced into the compressor must be appropriately adjusted by pressure adjusting means such as a pump so as to reach values determined by the specifications of the compressor (for example, capacity and rotation speed). I must. When a device such as a pump is separately used in this way, energy loss occurs again by the amount that the pump or the like uses for its driving force, and as a result, the amount of energy that can be recovered from the energy for mechanical loss decreases. This is a factor that reduces the energy efficiency of the heat pump system.

  The objective of this invention is providing the heat pump system which can improve energy efficiency.

  (1) In order to achieve the above object, the present invention provides an evaporator through which a pipe line through which an external heat source flows passes and heats the working medium to evaporate, and a working medium evaporated by the evaporator. A compressor that compresses, a steam supply line that supplies a working medium compressed by the compressor to a heat utilization unit, and the compressor after the lubricating oil of the compressor flows and passes through the interior of the evaporator, It has a pipe line to be connected and an oil supply system that circulates and supplies lubricating oil to the compressor.

  (2) Further, in order to achieve the above-mentioned object, the present invention compresses the water vapor from the evaporator through which the pipe line through which the external heat source flows passes and heats the water into water vapor. Connected to the compressor after the lubricating oil of the compressor flows and passes through the inside of the evaporator. And an oil supply system that circulates and supplies lubricating oil to the compressor.

  (3) In the above (1), preferably, the oil supply system is provided with an upstream side in a lubricating oil flow direction from a portion where a conduit through which the lubricating oil flows passes through the evaporator, and the lubricating oil is stored. Have an oil tank.

  (4) In the above (1), preferably, the oil supply system is provided with a pipe line through which the lubricating oil circulates at a downstream side in a lubricating oil distribution direction from a portion passing through the evaporator, and the lubricating oil is stored. Have an oil tank.

  (5) In the above (1), preferably, the oil supply system supplies lubricating oil to the compressor and a prime mover that drives the compressor.

  (6) In the above (1), preferably, the oil supply system supplies lubricating oil to a bearing of a rotor of the compressor.

  (7) In the above (5), preferably, the oil supply system supplies lubricating oil to a bearing of a rotor of the prime mover.

  (8) In the above (1), preferably, the conduit through which the external heat source flows is provided on the upstream side in the external heat source flow direction from the portion passing through the evaporator, and the flow rate adjustment for adjusting the flow rate of the external heat source It shall have means.

  (9) In the above (1), preferably, in the evaporator, the higher the temperature of the medium circulating through the pipe line through which the external heat source flows and the pipe line through which the lubricating oil flows, the compressor It shall be provided on the side.

  According to the present invention, the energy consumed by the mechanical loss can be efficiently recovered, so that the energy efficiency of the heat pump system can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a heat pump system according to an embodiment of the present invention.

  The illustrated heat pump system includes a water supply system 1 that supplies water (working medium), an evaporator 2 that heats water from the water supply system 1 to steam, a prime mover 3 that generates driving force, and an evaporator 2. 4 which compresses the steam of the steam by the driving force applied from the prime mover 3, the steam supply line 5 which supplies the steam compressed by the compressor 4, and the heat which uses the steam from the steam supply line 5 as a heat source Mainly provided is a utilization facility (heat utilization section) 6 and an oil supply system 7 for circulating and supplying lubricating oil to the compressor 4 and the prime mover 3.

  The water supply system 1 includes a water supply pipe 10 through which liquid water flows, a branch point 11 provided on the downstream side of the water supply pipe 10, and two water supply pipes 12 and 13 extending from the branch point 11. One water supply line 12 extending from the branch point 11 is connected to the evaporator 2 via a flow rate adjusting valve 14, and the other water supply line 13 is connected to a mixer 17 via a pump 15 and a flow rate adjusting valve 16. Has been.

  The evaporator 2 is provided with a heat source line 20 through which an external heat source flows, and an oil discharge line 21 (described later) through which the heated lubricating oil supplied to the compressor 4 and the prime mover 3 flows. It has been. The heat source pipe line 20 includes a flow rate adjusting valve 22 that is provided upstream from the portion that passes through the evaporator 2 in the direction of circulation of the external heat source and that adjusts the flow rate of the external heat source that passes through the evaporator 2. The evaporator 2 heats water (working medium) using a fluid flowing through the pipes 20 and 21 as a heat source to generate water vapor. Further, the external heat source in the heat source pipe line 20 may be a relatively low temperature, for example, warm waste water from a factory or the like is circulating.

  By the way, due to the temperature difference between the external heat source and the lubricating oil, the state of the water vapor generated by the pipelines 20 and 21 is determined from the design specifications (for example, capacity and rotational speed) of the compressor 4 (hereinafter referred to as the If it is significantly different from the design value, the operability and performance of the compressor 4 may be greatly reduced. Therefore, in the present embodiment, the temperature difference between the two is maintained so that the state of water vapor at the compressor inlet is at least within the above design value.

  Moreover, it is preferable that the temperature of the external heat source in the heat source line 20 is as close as possible to the temperature of the lubricating oil flowing through the oil drain line 21 (for example, 70 to 90 degrees). The closer the temperatures of these two are, the more the state of water vapor (for example, enthalpy and superheat) generated in the evaporator 2 by the heat source in the heat source line 20 and the oil drain line 21 becomes the same. Thereby, the water vapor generated in the evaporator 2 can be directly introduced into the compressor 4 without particularly controlling the temperature of the heat source of the pipes 20 and 21.

  Moreover, since the temperature of the liquid water in the evaporator 2 corresponds to the boiling point with respect to the pressure inside the evaporator 2, that is, the saturation temperature, the lower the pressure in the container, the lower the temperature of the liquid water. The amount of heat that can be recovered from the heat source increases. In other words, in other words, the lower the pressure in the evaporator 2, the lower the temperature of the heat medium that can be used as an effective heat source.

Here, an example is given and the structure of the evaporator 2 is demonstrated in detail.
FIG. 2 is a schematic configuration diagram of the evaporator 1 provided in the heat pump system according to the embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the previous figure, and description is abbreviate | omitted (a later figure is handled similarly).

  In FIG. 2, the evaporator 2 includes a pressure vessel 30 provided so as to be able to withstand vacuum, a heat source line 20 and an oil discharge line 21 disposed so as to pass through the pressure vessel 30, and each line 20. , 21 are provided with a plurality of fins (heat transfer plates) 31, which constitute a plate fin type heat exchanger.

  In the pressure vessel 30, water 32 (see FIG. 1) supplied from the water supply system 1 is stored. Further, the fins 31 are appropriately arranged at predetermined intervals in the pressure vessel 30, and promote heat exchange between the water 32 (refrigerant) in the pressure vessel 30 and the heat source in the pipes 20 and 21.

  The flow rate of water vapor generated in the evaporator 2 is determined by the amount of heat exchanged between the heat source in the heat source line 20 and the oil drain line 21 and the water 32 in the evaporator 2. It is necessary to adjust so as to approach the suction amount (design value) determined by specifications (for example, capacity and rotation speed). Here, the amount of heat exchanged with the water 32 in the evaporator 2 is a pipe led into the evaporator 2 when the heat transfer area and temperature of the heat source in each of the pipes 20 and 21 in the evaporator 2 are the same. It is determined by the flow rate of the heat source in the paths 20 and 21. Generally, the flow rate of the oil drain line 21 (that is, the amount of lubricating oil supplied to the compressor and the prime mover) is uniquely determined. Therefore, when adjusting the exchange heat amount, the flow rate of the heat source in the heat source line 20 You can adjust. Therefore, the flow rate of the heat source in the heat source line 20 may be adjusted in order to adjust the water vapor flow rate generated in the evaporator 2 so as to match the design value. Therefore, the flow rate adjusting valve 22 is used to adjust the flow rate of the heat source in the heat source pipe line 20 in this substantial form.

  In the evaporator shown in FIG. 2, the heat source line 20 is disposed above the oil drain line 21, but the temperature of the heat source is high when there is a considerable temperature difference between the heat sources that flow through both. It is advisable to arrange this on the gas phase side in the liquid phase (water 32) of the evaporator 2 (that is, upward in the present embodiment). If it arrange | positions in this way, since a high-temperature heat source will be arrange | positioned as it approaches the compressor 4, the heat transfer efficiency in the evaporator 2 will improve. In FIG. 2, the pipes 20 and 21 are arranged up and down. However, when the heat source temperatures flowing through the pipes 20 and 21 are about the same, the arrangement method is not particularly limited.

  The prime mover 3 is connected to a rotor 40 (described later) of the compressor 4, and drives the compressor 4 via the rotor 40. The prime mover 3 of the present embodiment has a rotating shaft (not shown) and a bearing (not shown) that supports the rotating shaft. The bearing (not shown) is lubricated by an oil supply system 7. Is supplied. The prime mover 3 is sufficient if it provides a driving force (rotational power) to the compressor 4, and includes a fluid machine such as a turbine and an electric motor such as a motor. The prime mover 3 is connected to a supply system (not shown) for supplying electricity, air pressure and the like as a drive source.

  The compressor 4 includes a first compression stage 42, a second compression stage 43, a rotor 40 that is a rotation shaft of the compression stages 42 and 43, and bearings 44 and 45 that support the rotor 40. The first compression stage 42 is connected to the evaporator 2 on the upstream side and connected to the mixer 17 on the downstream side. The second compression stage 43 is connected to the mixer 17 on the upstream side and connected to the supply pipe 5 on the downstream side. In the compressor 4 configured as described above, the steam supplied from the evaporator 2 is pressurized and heated by the compression stages 42 and 43. In the present embodiment, a multistage compressor will be described as an example, but the present invention is not limited by the number of stages of the compressor.

  The mixer 17 is branched at the branching point 11, is pressurized by the pump 15, and liquid water whose flow rate is adjusted by the flow rate adjusting valve 16 is supplied via the water supply line 13. Thus, the liquid water supplied to the mixer 17 is mixed with the compressed steam from the first compression stage 42 and evaporated, and the temperature of the water vapor flowing into the second compression stage 43 is lowered by the latent heat of evaporation. In general, compressors have the property that, when compared at the same pressure ratio, the compression power decreases as the intake air temperature decreases, so the liquid water added by the mixer 17 increases its mass flow rate and the compression power due to its evaporation. Contributes to reduction.

  The steam supply line 5 is connected to the compressor 4 on the upstream side and is connected to the heat utilization facility 6 on the downstream side. The steam compressed by the compressor 4 circulates in the steam supply line 5, and the steam is supplied to the heat utilization facility 6 on the downstream side and used as a heat source. In addition, the phrase “steam supply line” in the text and claims indicates “pipe for supplying“ gas ”from which liquid has evaporated”, and particularly “supplying water vapor (in which water has evaporated)” It does not indicate only the “pipe line”.

  The oil supply system 7 includes an oil tank 50 in which the lubricating oil of the compressor 4 and the prime mover 3 is stored, an oil pump 51 that pumps the lubricating oil in the oil tank 50, bearings 44 and 45 of the compressor 4, and the drive shaft 3. An oil supply line 52 for supplying the lubricating oil to the bearings of the oil and the oil discharge line 21 for supplying the lubricating oil discharged from the compressor 4 and the prime mover 3 to the oil tank 50 is provided.

  The oil supply line 52 is connected to the oil tank 50 via the oil pump 51 on the upstream side in the lubricating oil flow direction, and branches on the downstream side to connect to the bearings 44 and 45 of the compressor 4 and the bearing of the drive shaft 3, respectively. Has been. The oil drain line 21 is connected to the bearings 44 and 45 of the compressor 4 and the bearing of the drive shaft 3 on the upstream side, and is connected to the oil tank 50 after passing through the inside of the evaporator 2 on the downstream side.

  The temperature at which the lubricating oil is supplied to the bearings 44 and 45 of the compressor 4 and the bearing of the drive shaft 3 is in a certain temperature range due to the vibration characteristics of the rotor 40 and the oil film characteristics of the bearings 44 and 45 and the like. Needs to be kept within. In the present embodiment, the lubricating oil whose temperature has increased due to mechanical loss such as bearing loss is cooled to a temperature suitable for oil supply by exchanging heat with water in the evaporator 2 and supplied again to the compressor 4 and the prime mover 3. The system is configured.

  By the way, the steam supply pipe 5 in the above constitutes the “steam supply pipe for supplying the working medium compressed by the compressor to the heat utilization section” in the claims, and the heat source pipe 20 is claimed in the claims. The oil drain line 21 is connected to the compressor after the lubricating oil of the compressor flows and passes through the evaporator in the claims. Is made up.

  In the heat pump system configured as described above, the liquid water flowing through the water supply pipe 10 branches into the water supply pipe 12 and the water supply pipe 13 at the branch point 11. The liquid water guided to the water supply pipe 12 is appropriately adjusted in flow rate by the flow rate adjusting valve 14 and then supplied to the evaporator 2. On the other hand, the liquid water guided to the water supply pipe 13 is boosted by the pump 15, is appropriately adjusted in flow rate by the flow rate adjusting valve 16, and then supplied to the mixer 17.

  The liquid water supplied to the evaporator 2 joins with the water 32 stored in the evaporator 2 and is heated by the external heat source that flows through the heat source pipe 20 and the lubricating oil that flows through the drain oil pipe 21. The water 32 is evaporated by the heat source in the pipes 20 and 21 to become water vapor, and is supplied to the compressor 4.

  The water vapor introduced into the compressor 4 is first compressed in the first compression stage 42 and introduced into the mixing chamber 17. The steam introduced into the mixing chamber 17 is mixed with liquid water introduced through the water supply pipe 13. The liquid water mixed in the mixer 17 evaporates, and the latent heat of evaporation lowers the temperature of the water vapor to contribute to the reduction of the compression power and increases the mass flow rate of the water vapor. Thus, the water vapor mixed with liquid water in the mixing chamber 17 is introduced into the second compression stage.

  The water vapor introduced into the second compression stage 43 is further compressed and heated there and guided to the steam supply line 5. Thus, the water vapor compressed and heated by the compressor 4 is supplied to the heat utilization facility 6 through the steam supply pipe 5.

  On the other hand, the lubricating oil filled in the oil tank 50 at a temperature suitable for refueling (hereinafter referred to as a refueling temperature (for example, 40 to 60 degrees)) is boosted by the oil pump 51 and passed through the refueling conduit 52. The bearings 44 and 45 of the compressor 4 and the bearings of the prime mover 3 are supplied. The lubricating oil supplied to each bearing is heated (for example, 70 to 90 degrees) due to mechanical loss generated in the compressor 4 and the prime mover 3 such as friction loss with the rotor 40 (bearing loss), and the oil drain line 21. To be discharged. The lubricating oil discharged to the oil discharge pipe 21 is subsequently introduced into the evaporator 2 and is heat-exchanged with the water (refrigerant) 32 and cooled to the oil supply temperature. That is, the energy for the mechanical loss is recovered by the water that is the working medium of the heat pump system by this heat exchange. The lubricating oil cooled to the oil supply temperature is returned to the oil tank 50 by passing through the evaporator 2.

  Next, the effect of this embodiment will be described.

  First, in order to facilitate understanding of the effects of the present embodiment, a comparative example of the present embodiment will be described.

FIG. 3 is an overall configuration diagram of a heat pump system which is a comparative example of the embodiment of the present invention.
The illustrated heat pump system includes an oil supply system different from the present embodiment. The oil supply system 107 in this comparative example is provided in the middle of the oil supply conduit 152 and the oil supply conduit 152 that supplies the lubricant to the bearings of the compressor 4 and the prime mover 3, and cools the lubricating oil whose temperature has increased with cooling water. The oil cooler 100 and an oil drain line 121 that supplies lubricating oil whose temperature has been raised by the bearings of the compressor 4 and the prime mover 3 to the oil tank 50 are provided. Thus, the heat pump system of the comparative example cools the lubricating oil using the oil cooler 100 independent of the water supply system 1, the evaporator 2, and the like.

  Here, the operation coefficient (ε1) of the heat pump system of this comparative example is obtained.

  The operating coefficient ε of the heat pump system is generally defined by the ratio of the effective heating output Q2 to the input work L by the prime mover of the compressor, and is expressed by the following formula (1).

FIG. 4 is a schematic view of the heat balance in the heat pump system of the comparative example.
As shown in this figure, the elements used to determine the effective heating output Q2 in the comparative example include the input heat (Q1) from the external heat source in the heat source line 20 in the evaporator 2 and the compressor 4 There are compressor efficiency (η) and input work (L1) by the prime mover 3, and mechanical loss (Loss) in the compressor 4 and prime mover 3. Thereby, the effective heating output Q2 in the above comparative example is expressed by the following formula (2).

Therefore, the operating coefficient ε1 of the heat pump system of the comparative example is finally expressed by the following equation (3) by the above equations (1) and (2).

As is clear from this equation (3), when the oil cooler is provided independently to cool the lubricating oil as described above, the heating output Q2 is reduced by the mechanical loss Loss, and the operating coefficient is reduced. Will be reduced.

  As a technology that improves this point, a part of the working medium of the heat pump system is bypassed and led to an oil cooler to be used as a lubricant for the lubricating oil, which recovers energy for the mechanical loss Loss in the above comparative example. Yes (see Patent Document 1).

  However, in this technique, the working medium used as the refrigerant in the oil cooler is then led to the compressor. For this reason, the pressure and temperature of the working medium when introduced into the compressor must be appropriately adjusted by pressure adjusting means such as a pump so as to reach values determined by the specifications of the compressor (for example, capacity and rotation speed). I must. When a device such as a pump is separately used in this way, energy loss occurs again by the amount that the pump or the like uses for its driving force, and as a result, the amount of energy that can be recovered from the energy for mechanical loss decreases. Moreover, since this technique includes an oil cooler as in the first comparative example, it also has a problem that the installation area of the heat pump system increases.

  In contrast to these technologies, the heat pump system according to the present embodiment is configured such that the lubricating oil from the compressor 4 and the prime mover 3 flows and passes through the inside of the evaporator 2, and the bearings of the compressor 4 and the prime mover 3. And an oil supply line 52 through which lubricating oil cooled to the oil supply temperature flows, and is provided with an oil supply system 7 that circulates and supplies the lubricant to the compressor 4.

  By passing the oil drain line 21 through the inside of the evaporator 2 in this way, the lubricating oil discharged from the compressor 4 and the prime mover 3 can be heat-exchanged with the water in the evaporator 2, so that the mechanical loss amount is reduced. Energy can be recovered efficiently. Thus, according to the present invention, the energy consumed by the mechanical loss can be efficiently recovered, so that the energy efficiency of the heat pump system can be improved.

  Further, in the present embodiment, the temperature difference between the lubricating oil and the external heat source is maintained so that the state of the water vapor generated in the evaporator 2 is within the design value of the compressor 4. There is no need to separately provide pressure adjusting means such as a pump for adapting to the design value. As a result, the system energy is not consumed due to the driving force of the pressure adjusting means such as a pump as in the comparative example, so that a system with higher efficiency than the comparative example can be constructed. In the above description, the case where the working medium is water has been described. However, any other heat source may be used as long as a heat source having a relatively low temperature similar to the case where water is used.

  Here, the operation coefficient (ε2) of the heat pump system of the present embodiment is obtained and compared with the operation coefficient ε1 of the comparative example.

  FIG. 5 is a schematic diagram of the heat balance in the heat pump system of the present embodiment. As shown in this figure, the elements used when obtaining the effective heating output Q2 in the present embodiment include, in addition to those shown in FIG. 4, the lubricating oil in the oil drain line 21 in the evaporator 2. There is an input heat of (equivalent to Loss). Thereby, the effective heating output Q2 in this Embodiment is represented by the following formula | equation (4).

As shown in this equation (4), in the present embodiment, the mechanical loss Loss of the compressor 4 and the prime mover 3 is recovered by the evaporator 2, and therefore the effective heating output Q2 is increased by the mechanical loss Loss compared to the comparative example. ing. Therefore, the operating coefficient ε2 of the heat pump system of the present embodiment is finally expressed by the following equation (5) by the above equations (1) and (4).

As shown in this equation (5), according to the present embodiment, since the effective heating output Q2 is larger than that of the comparative example, the operation coefficient ε of the heat pump system can be increased. Therefore, the energy efficiency of the heat pump system can be improved.

  Further, in this embodiment, since the lubricating oil whose temperature has increased due to mechanical loss is cooled by the evaporator 2, it is not necessary to separately provide a cooling device such as an oil cooler. Therefore, according to the present embodiment, since the plant installation area can be reduced, the cost for manufacturing and installing the system can be reduced.

  By the way, in embodiment mentioned above, although lubricating oil is cooled by allowing the inside of the evaporator 2 to pass through the oil drain line 21, the structure which cools lubricating oil (recovers mechanical loss) is the structure. It is not limited to this. Below, the structure is demonstrated as a modification of said embodiment.

  FIG. 6 is an overall configuration diagram of a heat pump system which is a modification of the embodiment of the present invention.

  The oil supply system 7A of the heat pump system shown in this figure is connected to the oil tank 50 via the oil pump 51 on the upstream side in the lubricating oil flow direction, and after passing through the inside of the evaporator 2 on the downstream side, the compressor 4 and the prime mover 3 is connected to the bearings of the compressor 4 and the prime mover 3 on the upstream side and is connected to the oil tank 50 on the downstream side. That is, the present modification is different from the above embodiment in that the lubricating oil once stored in the oil tank 50 is cooled when supplied to the compressor 4 and the prime mover.

  Even if comprised in this way, since the energy for an opportunity loss can be collect | recovered via the working medium in the evaporator 2, the effect similar to said case can be acquired. Therefore, the system should be configured by appropriately selecting, from the above embodiment and its modifications, the one suitable for the situation, such as the arrangement relationship of the evaporator 2 and the oil tank 50, etc., or the convenience of piping connecting them. Can do.

  In each of the above embodiments, the configuration in which the conduit through which the lubricating oil maintained at the oil supply temperature flows is connected to the bearings of the compressor 4 and the prime mover 3 and mainly recovers the bearing loss has been described. Of course, this pipe line may be connected to a location other than the bearings of the compressor 4 and the prime mover 3 so as to recover mechanical loss caused by other factors. In each of the above embodiments, the oil supply line is connected to both the compressor 4 and the prime mover 3, but it goes without saying that the oil supply line may be connected to either one.

1 is an overall configuration diagram of a heat pump system according to an embodiment of the present invention. The schematic block diagram of the evaporator with which the heat pump system which is embodiment of this invention was equipped. The whole heat pump system lineblock diagram which is a comparative example of an embodiment of the invention. The schematic of the heat balance in the heat pump system which is a comparative example of embodiment of this invention. The schematic of the heat balance in the heat pump system which is embodiment of this invention. The whole heat pump system lineblock diagram which is a modification of an embodiment of the invention.

Explanation of symbols

2 Evaporator 3 Motor 4 Compressor 5 Steam supply line 6 Heat utilization equipment 7 Oil supply system 7A Oil supply system 20 Heat source line 21 Oil discharge line 21A Oil discharge line 22 Flow rate control valve 40 Rotor 44 Bearing 45 Bearing 50 Oil tank 52 Oil supply Pipe line 52A Refueling pipe line

Claims (9)

An evaporator through which a pipe line through which an external heat source flows passes through and heats the working medium to evaporate;
A compressor for compressing the working medium evaporated by the evaporator;
A steam supply line for supplying the working medium compressed by the compressor to the heat utilization unit;
A lubricating oil supply system having a pipe line connected to the compressor after the lubricating oil of the compressor flows and passes through the inside of the evaporator, and the lubricating oil is circulated and supplied to the compressor. Heat pump system. An evaporator through which an external heat source flows and heats the water into water vapor;
A compressor for compressing the water vapor from the evaporator;
A steam supply line for supplying water vapor compressed by the compressor to the heat utilization unit;
A lubricating oil supply system having a pipe line connected to the compressor after the lubricating oil of the compressor flows and passes through the inside of the evaporator, and the lubricating oil is circulated and supplied to the compressor. Heat pump system. The heat pump system according to claim 1,
The oil supply system has an oil tank in which a pipeline through which the lubricating oil flows is provided on the upstream side in the lubricating oil distribution direction from a portion passing through the evaporator, and the lubricating oil is stored. Heat pump system. The heat pump system according to claim 1,
The oil supply system includes an oil tank in which a pipeline through which the lubricating oil flows is provided downstream from a portion passing through the evaporator in a lubricating oil flowing direction, and the lubricating oil is stored. Heat pump system. The heat pump system according to claim 1,
The heat supply system, wherein the oil supply system supplies lubricating oil to the compressor and a prime mover that drives the compressor. The heat pump system according to claim 1,
The heat pump system, wherein the oil supply system supplies lubricating oil to a bearing of a rotor of the compressor. The heat pump system according to claim 5, wherein
The heat pump system, wherein the oil supply system supplies lubricating oil to a bearing of a rotor of the prime mover. The heat pump system according to claim 1,
The pipe through which the external heat source flows is provided on the upstream side in the external heat source flow direction from the portion passing through the evaporator, and has a flow rate adjusting means for adjusting the flow rate of the external heat source. The heat pump system according to claim 1,
In the evaporator, the higher the temperature of the medium flowing through the pipe line through which the external heat source flows and the pipe line through which the lubricating oil flows is provided on the gas phase side in the liquid phase of the evaporator. A heat pump system characterized by

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