JP4623370B2 - Engine driven heat pump - Google Patents

Description

  The present invention relates to an engine-driven heat pump having an arrangement of a flexible pipe for suppressing vibration of refrigerant piping in an engine-driven heat pump.

  Patent Document 1 proposes an engine-driven heat pump device that uses a first flexible pipe and a second flexible pipe as refrigerant pipes to reduce vibrations from the compressor. Specifically, in the refrigerant pipe fixing method, one end of the refrigerant pipe is fixed to the compressor and the other end is fixed to the main body.

Patent Document 2 proposes an engine heat pump in which the layout of the flexible pipe is devised. Specifically, the flexible pipe is divided back and forth with respect to the center of gravity position of the engine and bent in a U-turn shape.
Japanese Patent No. 2788650 JP 2004-93128 A

  In the prior art, the flexible pipe has been laid out in such a way that vibration is absorbed by the flexible pipe and the vibration is not transmitted to the pipe after the flexible pipe. The vibration generated in the engine heat pump is a combination of the following three vibrations. These are engine vibration, compressor vibration, and pressure pulsation inside the refrigerant piping. However, in order to absorb the synthesized vibration, the length of the flexible pipe becomes long, and the pipe between the first flexible pipe and the second flexible pipe resonates due to the vibration, so that the life of the flexible pipe is remarkably increased. There is a problem of shortening.

  The conventional engine-driven heat pump device described in Patent Document 1 has a problem that the first flexible pipe and the second flexible pipe are not fixed and resonance of the flexible pipe occurs at that portion. Further, in the engine heat pump described in Patent Document 2, there is no way to suppress the resonance of the flexible tube itself.

  In recent years, the density of refrigerants has been increasing in the air conditioning industry. By using this high-density refrigerant, the refrigerant pressure inside the refrigerant pipe is increased by about 1.5 times. Along with this, it is necessary to improve the pressure resistance of the refrigerant pipe itself. By improving the pressure resistance of the refrigerant pipe itself, the vibration absorption of the refrigerant pipe is lowered. Therefore, it has become difficult to ensure the reliability of the flexible pipe that absorbs engine vibration and compressor vibration.

  In order to solve the above-described problems, an object of the present invention is to provide an engine-driven heat pump having a flexible pipe arrangement that reduces vibration applied to the flexible pipe itself and prevents resonance of the flexible pipe itself.

Means for Solving the Problems and Effects of the Invention

  Therefore, the present inventor has intensively studied to solve this problem, and as a result of repeated trial and error, by disassembling the arrangement of the flexible tube for each function, the vibration applied to the flexible tube itself is reduced and the first flexible The inventors have come up with the idea that the resonance of the flexible tube itself can be prevented by fixing the space between the tube and the second flexible tube, and the present invention has been completed.

The engine-driven heat pump of the present invention includes an engine that is elastically supported by a frame via an engine mount, a compressor that is fixed to an engine bracket that is fixed to the engine, and that is driven by the engine, and is held by the frame An engine driven type comprising: an oil separator and an accumulator; and a flexible pipe group including a first flexible pipe and a second flexible pipe disposed in series between the compressor and the oil separator and / or between the compressor and the accumulator, respectively. In heat pump,
A pipe on one end side of the first flexible pipe is connected to the compressor, a pipe on the other end side of the first flexible pipe is supported by the engine bracket, and a pipe on one end side of the second flexible pipe is It is connected to an oil separator or the accumulator, and a pipe on the other end side of the second flexible pipe is supported by the engine bracket.

  According to the present invention, by disassembling the arrangement of the flexible pipe for each function, vibration applied to the flexible pipe itself can be reduced and resonance of the flexible pipe itself can be prevented.

  The vibrations generated by the engine-driven heat pump are engine vibrations, compressor vibrations, and pressure pulsations inside the refrigerant piping as described above. The engine elastically supported by the engine mount constantly vibrates by driving. The compressor fixed to the engine bracket also vibrates constantly at a frequency different from that of the engine. Furthermore, the pressure pulsation vibration is constantly generated in the pipes of the refrigerant compressed by the compressor.

  By fastening the pipe on the other end side of the first flexible pipe connected to the compressor to the engine bracket fixed to the engine, the first flexible pipe can eliminate the vibration of the engine bracket synchronized with the vibration of the engine. . Thereby, the first flexible tube can absorb only two vibrations of the compressor vibration and the pressure pulsation inside the refrigerant among the three vibrations.

  The compressor is connected to the engine by a compressor belt and is driven by the engine. The compressor may have a slide mechanism so that the tension of the compressor belt can be adjusted.

  The first flexible pipe has a function of absorbing misalignment between the compressor and the pipe. Therefore, the first flexible pipe can also be used for a compressor slide mechanism necessary for adjusting the tension of the compressor belt.

  On the other hand, by fastening the pipe on the other end side of the second flexible pipe coupled with the oil separator or the accumulator to the engine bracket, the second flexible pipe eliminates the two vibrations of the compressor and the pressure pulsation inside the refrigerant. Only the vibration of the engine that vibrates through the frame and mount can be absorbed.

  Thus, the durability of the flexible tube can be improved by providing the first flexible tube and the second flexible tube with independent functions.

  A flexible pipe formed between the first flexible pipe and the second flexible pipe by fixing the pipe on the other end side of the first flexible pipe and the pipe on the other end side of the second flexible pipe to the engine bracket. It is possible to suppress the occurrence of resonance.

  In the engine-driven heat pump of the present invention, the compressor may be one or a plurality of compressors, and the pipes on the other end side of the first flexible pipe and the second flexible pipe are supported by a fixture. And the fixture may be fastened to the engine bracket. The fixing member moves integrally with the engine bracket by being fastened to the engine bracket. For example, a plate may be used as the fixture.

  The pipe on the other end side of the first flexible pipe connected to one or a plurality of compressors is fastened to the fixture. By fastening the first flexible pipes having different vibrations individually to the fixture that moves integrally with the engine bracket, the respective vibrations can be canceled and unified.

  When the fixing member is fastened to the engine bracket, the first flexible pipe can remove engine vibration as described above.

  Similarly, the pipe on the other end side of the second flexible pipe coupled to the oil separator or the accumulator is fastened to the fixture. Similarly to the above, by fastening the second flexible pipes having different vibrations to a fixture that moves integrally with the engine bracket, the respective vibrations can be canceled and unified.

  When the fixing member is fastened to the engine bracket, as described above, the second flexible pipe can absorb only the vibration of the engine that vibrates through the frame and the mount.

  As described above, the first flexible pipe and the second flexible pipe are provided with independent functions, and the vibrations can be unified through the fixture, thereby improving the durability of the flexible pipe.

  Further, by fixing the fixing tool to the engine bracket, it is possible to suppress the occurrence of resonance of the flexible pipe that occurs between the first flexible pipe and the second flexible pipe.

  As another effect, since the pipe on the other end side of each flexible pipe is fastened to the fixture, the position of each flexible pipe is clarified, and the assemblability is greatly improved.

  The engine-driven heat pump of the present invention may be fastened via a mount when the pipe supported by the engine bracket and the engine bracket are fastened. Moreover, when the said piping is supported by the fixture and the fixture and the said engine bracket are fastened, you may fasten via a mount.

  When the pipe is fastened to the engine bracket through the mount, the pipe is supported by the engine bracket in a vibration-proof manner through the mount.

  The mount can transmit the vibration that the pipe receives from each flexible pipe to the engine bracket and thus to the engine. In particular, when the rigidity of the engine bracket is low with respect to the vibration of the pipe, the mount has a great effect of damping the vibration. When the engine bracket resonates due to the vibration, the resonance can be suppressed through the mount. The mount also has the effect of reducing the vibration of each flexible tube.

  When the fixture is fastened to the engine bracket via the mount, the fixture is supported by the engine bracket in a vibration-proof manner via the mount.

  The mount can transmit the vibration received by the fixture from each flexible pipe to the engine bracket and thus to the engine.

  In particular, when the rigidity of the engine bracket is low with respect to the vibration that the fixture receives from each flexible pipe, the mount has a great effect of attenuating the vibration. When the engine bracket resonates due to the vibration, the resonance can be suppressed through the mount.

  The mount also has an effect of reducing the vibration of each flexible tube unified by the fixture.

  As described above, the first flexible pipe and the second flexible pipe have independent functions, and the vibration of the fixture or the pipe can be attenuated and transmitted by the mount, thereby further improving the durability of the flexible pipe. .

  Further, by fastening the pipe or the fixture to the engine bracket via the mount, it is possible to further suppress the occurrence of resonance of the flexible pipe that occurs between the first flexible pipe and the second flexible pipe.

  Next, an Example is given and this invention is demonstrated in detail.

  FIG. 1 is a plan view showing the configuration of a first embodiment according to the engine-driven heat pump of the present invention.

  As shown in FIG. 1, the engine-driven heat pump of this embodiment is fixed to an engine 3 elastically supported on a frame 1 via an engine mount 21 and an engine bracket 4 fixed to the engine 3. 3, a compressor 5 driven by 3, an accumulator 6 and an oil separator 7 held in the frame 1, a first flexible pipe 81 and a second flexible pipe 91 arranged in series between the compressor 5 and the accumulator 6, The first flexible pipe 82 and the second flexible pipe 92 are arranged in series between the compressor 5 and the oil separator 7.

  The frame 1 is a frame that corresponds to the bottom surface of the engine-driven heat pump. The engine 3 is elastically supported by the frame 1 via an engine mount 21. The engine bracket 4 is fixed to the side surface of the engine 3 with bolts or the like, and is elastically supported by the frame 1 via the engine mount 22.

  The compressor 5 is fixed to the engine bracket 4 with bolts or the like, and is driven by the engine 3 via a compressor belt 10 interposed between a pulley 11 of the engine 3 and a pulley 12 of the compressor 5. Although not shown, the compressor 5 may have a slide mechanism that can adjust the tension of the compressor belt 10.

  Pipes on one end side of the first flexible pipes 81 and 82 are connected to the compressor 5. The pipes on the other end side of the first flexible pipes 81 and 82 are supported by the engine bracket 4 by the fixing bushes 13 and 14.

  The pipes on one end side of the second flexible pipes 91 and 92 are connected to the accumulator 6 and the oil separator 7, and the pipes on the other end side of the second flexible pipes 91 and 92 are similarly connected to the engine bracket 4 with the fixed bush 13 and 14 is supported.

  The refrigerant flow will be described below.

  The refrigerant containing the lubricating oil discharged from the compressor 5 enters the oil separator 7 through the first flexible pipe 82 and the second flexible pipe 92 and is separated from the lubricating oil to other functional parts (not shown). It is sent through other piping not shown.

  The refrigerant sent from other functional parts (not shown) through other pipes (not shown) is completely brought into a gas phase state by the accumulator 6 and passes through the second flexible pipe 91 and the first flexible pipe 81. And sucked into the compressor 5.

  In the engine-driven heat pump having such a configuration, the engine 3 elastically supported by the engine mount 21 is constantly vibrated by driving. The compressor 5 fixed to the engine bracket 4 also vibrates constantly at a frequency different from that of the engine 3. Further, the pressure pulsation vibration is constantly generated in the refrigerant in the refrigerant compressed by the compressor 5.

  The first flexible pipes 81 and 82 are synchronized with the vibration of the engine 3 by fastening the pipes on the other ends of the first flexible pipes 81 and 82 connected to the compressor 5 to the engine bracket 4 fixed to the engine 3. The vibration of the engine bracket 4 can be eliminated. Thereby, the first flexible pipes 81 and 82 can absorb only two vibrations of the compressor vibration and the pressure pulsation inside the refrigerant among the three vibrations.

  Further, the first flexible pipes 81 and 82 can absorb the positional deviation between the compressor 5 and the pipe. Therefore, the first flexible pipes 81 and 82 can also correspond to a compressor slide mechanism necessary for adjusting the tension of the compressor belt 10.

  Further, by fastening the pipes on the other end side of the second flexible pipes 91 and 92 coupled to the one accumulator 6 or the oil separator 7 with the engine bracket 4, the second flexible pipes 91 and 92 It is possible to absorb only the vibration of the engine 3 that vibrates via the frame 1 and the mount 21 except for the two vibrations of the pressure pulsation.

  Thus, by giving the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 independent functions, vibration applied to each flexible pipe itself can be reduced and the durability of the flexible pipe can be improved. I can do it.

  In addition, the pipe on the other end side of the first flexible pipe 81 and the pipe on the other end side of the second flexible pipe 91 and the pipe on the other end side of the first flexible pipe 82 and the other end side of the second flexible pipe 92 are connected in series. By fastening this pipe to the engine bracket 4, the occurrence of resonance of the flexible pipe that occurs between the first flexible pipe 81 and the second flexible pipe 91 and between the first flexible pipe 82 and the second flexible pipe 92 is suppressed. It becomes possible.

  FIG. 2 is a plan view showing a configuration of a second embodiment according to the engine-driven heat pump of the present invention. In FIG. 2, the same functional parts as those in FIG. 1 described above are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  The configuration of the second embodiment relating to the engine-driven heat pump shown in FIG. 2 is substantially the same as that of the first embodiment of FIG. The difference from the first embodiment of FIG. 1 is that the pipes on the other end side of the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 are supported by the fixing bush 16 on the plate 15 which is a fixture. The plate 15 is fixed to the engine bracket 4 with bolts or the like.

  The pipes on the other end side of the first flexible pipes 81 and 82 are fastened to the plate 15. By fastening the first flexible pipes 81 and 82 having different vibrations to the plate 15, the first flexible pipes 81 and 82 can cancel each other and unify the vibrations.

  Similarly, the other flexible pipes of the second flexible pipes 91 and 92 are fastened to the plate 15. Similarly to the above, by fastening the second flexible pipes 91 and 92 having different vibrations to the plate 15, the second flexible pipes 91 and 92 can cancel each other and unify the vibrations.

  As in the first embodiment, the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 have independent functions, and vibrations can be unified through the plate 15, thereby further improving the flexibility of the flexible pipe. This leads to improved durability.

  Further, by fixing the plate 15 to the engine bracket 4, the occurrence of resonance of the flexible pipe between the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 can be suppressed as in the first embodiment. It becomes possible.

  As another effect, since the pipe on the other end side of each flexible pipe is fastened to the plate 15, the position of each flexible pipe becomes clear, and the assemblability is greatly improved.

  FIG. 3 is a plan view showing the configuration of a third embodiment according to the engine-driven heat pump of the present invention. In FIG. 3, the same functional parts as those in FIGS. 1 and 2 described above are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  The configuration of the third embodiment relating to the engine-driven heat pump shown in FIG. 3 is substantially the same as that of the first embodiment of FIG. 1 and the second embodiment of FIG. The difference between the first embodiment of FIG. 1 and the second embodiment of FIG. 2 is that the pipes on the other end side of the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 are plates that are fixtures. 15 is supported by a fixed bush 16, and the plate 15 is supported by the engine bracket 4 via a mount 17 in an anti-vibration manner.

  Through the mount 17, the plate 15 is supported by the engine bracket 4 in a vibration-proof manner. The mount 17 can transmit the vibration received by the plate 15 from each flexible pipe to the engine bracket 4 and thus the engine 3 by being attenuated.

  Further, the mount 17 has an effect of reducing the vibration of each flexible tube unified by the plate 15.

  As in the first and second embodiments, the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92 have independent functions, and vibrations are unified through the plate 15. In addition, in the third embodiment, the fact that the vibration can be attenuated and transmitted by the mount 17 is added, thereby further improving the durability of the flexible tube.

  Further, the plate 15 is supported by the engine bracket 4 via the mount 17 in an anti-vibration manner, thereby suppressing the occurrence of resonance of the flexible pipe that occurs between the first flexible pipes 81 and 82 and the second flexible pipes 91 and 92. It becomes possible as well.

  Further, similarly to the second embodiment, the pipes on the other end side of the respective flexible pipes are fastened to the plate 15, so that the positions of the respective flexible pipes are clarified and the assemblability is greatly improved.

It is a top view which shows the structure of the 1st Example which concerns on the engine drive type heat pump of this invention. It is a top view which shows the structure of the 2nd Example which concerns on the engine drive type heat pump of this invention. It is a top view which shows the structure of the 3rd Example which concerns on the engine drive type heat pump of this invention .

Explanation of symbols

1, frame, 21, 22, engine mount, 3, engine,
4, engine bracket, 5, compressor, 6, accumulator,
7, oil separator, 81, 82, first flexible tube,
91, 92, the second flexible tube,
10, compressor belt, 11, 12, pulley,
13, 14, 16, 18, 19, Fixed bushing, 15, Plate, 17, Mount.

Claims (3)

An engine elastically supported on the frame via an engine mount;
A compressor fixed to an engine bracket fixed to the engine and driven by the engine;
An oil separator and an accumulator held by the frame;
A flexible tube group comprising a first flexible tube and a second flexible tube arranged in series between the compressor and the oil separator and / or between the compressor and the accumulator;
In an engine driven heat pump including
A pipe on one end side of the first flexible pipe is connected to the compressor, a pipe on the other end side of the first flexible pipe is supported by the engine bracket, and a pipe on one end side of the second flexible pipe is An engine-driven heat pump characterized in that it is connected to an oil separator or the accumulator, and a pipe on the other end side of the second flexible pipe is supported by the engine bracket.   The compressor includes one or a plurality of compressors, the pipes on the other end side of the first flexible pipe and the second flexible pipe are supported by a fixture, and the fixture is fastened to the engine bracket. The engine-driven heat pump according to claim 1. The engine-driven heat pump according to claim 1 or 2, wherein when the pipe supported by the engine bracket and the engine bracket are fastened, the pipe is fastened via a mount .

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