JP4375205B2 - Connection piping - Google Patents

Description

  The present invention relates to a connection pipe capable of absorbing vibration, and more particularly to the structure of a connection pipe around a compressor in a refrigerant circuit used in a GHP (gas heat pump) or the like.

  A GHP (gas heat pump) is a type of air conditioner, and performs air conditioning using a gas engine. Specifically, a compressor connected to a refrigerant circuit is driven by a gas engine to circulate the refrigerant in the refrigerant circuit, and air conditioning is performed by movement of heat accompanying condensation and evaporation of the refrigerant.

In this case, since the compressor is connected to the gas engine, the vibration of the gas engine is transmitted to the compressor, and this vibration is also transmitted to the piping constituting the refrigerant circuit. When vibration is transmitted to the piping, the reliability of the piping is reduced due to the vibration. Therefore, a flexible piping is generally used as a part of the piping, and the bending due to such vibration is absorbed. Further, when adjusting the position of the compressor by adjusting the tension of the belt connecting the compressor and the engine, the stress due to the positional deviation is absorbed by this flexible pipe. In this way, the pipe connected to the compressor is provided with a portion that uses the flexible pipe for absorbing vibration and absorbing the displacement of the compressor.
JP-A-9-152232 JP-A-8-014705

  Conventionally, since both the vibration absorption from the engine and the displacement of the compressor are absorbed in the flexible pipe portion, there is a problem that the vibration absorption is inferior. That is, in the state where the flexible piping is bent to absorb the displacement of the compressor, vibration from the engine is further applied, so if further vibration occurs in the bent direction, the vibration cannot be sufficiently absorbed. There was a problem of transmitting vibrations. In addition, since the pipe connected to the compressor is fixed to the outdoor unit housing for storing the engine and the compressor by a bracket or the like, the vibration of the engine is transmitted to the housing through the bracket. Since the housing itself contains an engine and a compressor and is a heavy object, it does not cause a large vibration, but there is a problem that abnormal noise is generated at the connecting portion or the like due to a slight vibration.

 Therefore, it is a technical object of the present invention to solve the above problems.

The invention of claim 1 devised to solve the technical problem is:
A connection pipe connected to a prime mover, connected to a compressor that sucks refrigerant from an inlet, compresses the refrigerant inside, and discharges the compressed refrigerant from an outlet;
The connecting pipe comprises a first pipe portion which is connected to the suction port or the discharge port of the compressor, first flexible formed to be absorbed deflection from the outside is connected to the first pipe section comprising a pipe part, and a second pipe portion connected to the first flexible pipe section, and a second flexible pipe portion formed to be absorbed deflection from the outside is connected to the second pipe portion ,
The second piping portion is fixed to the prime mover via an engine fixing bracket attached to the prime mover, a connecting plate extending from the engine fixing bracket, and a piping fixing bracket connected and fixed to the connecting plate. The feature is that it is a connection pipe.

According to the first aspect of the present invention, two flexible pipe portions are provided in the pipe connected to the compressor, and a portion of the pipe (corresponding to the second pipe portion ) between the two flexible pipe portions is connected to the prime mover. By adopting such a configuration, the first flexible piping part vibrates together with a prime mover such as an engine. Therefore, vibration from the prime mover cannot be absorbed, and only the bending due to the displacement of the compressor is absorbed. It will be. On the other hand, the second flexible pipe section in order to perform the absorption of misalignment of the compressor at all first flexible pipe section, will be performed exclusively absorbed deflection due to vibration of the engine. That is, by dividing the flexible part in the pipe into two parts and fixing the space between them to the prime mover that is the vibration source, each flexible pipe part can be divided into one dedicated to position shift absorption and one dedicated to vibration absorption. . Therefore, it is possible to prevent a situation in which the flexible piping section absorbs engine vibration while being bent for adjusting the displacement of the compressor, and the vibration can be efficiently absorbed. Further, since the pipe connected to the compressor is fixed to the prime mover and not the outdoor unit housing, the vibration of the prime mover is not directly transmitted to the outdoor unit. For this reason, generation | occurrence | production of the abnormal noise by the minute vibration of an outdoor unit can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

 FIG. 1 is a diagram illustrating a schematic configuration of a connection form of a connection pipe in this example. FIG. 1 shows the configuration of an engine, a compressor, piping connected to the compressor, and only an oil separator and an accumulator connected to the piping in GHP, and a refrigerant circuit configuration from the oil separator to the accumulator Is omitted.

 In the figure, reference numeral 1 denotes a gas engine serving as a prime mover. The gas engine 1 includes an output shaft 1a, and the output shaft 1a is coaxially connected to the engine pulley 2. A belt 3 is hung on the engine pulley 2, and this belt 3 is also hung on a compressor pulley 4 so that both pulleys 2 and 4 rotate in conjunction with each other. The compressor pulley 4 is connected to a compressor 5 via a compressor input shaft 5 a that is coaxially connected to the compressor pulley 4.

 The compressor 5 has a discharge port 5b and a suction port 5c. A discharge-side connection pipe 10 is connected to the discharge port 5b, and a suction-side connection pipe 20 is connected to the suction port 5c. The discharge side connection pipe 10 and the suction side connection pipe 20 are connection pipes in the present invention.

 As shown in the figure, the discharge side connection pipe 10 includes a first discharge side pipe part 11, a first discharge side flexible pipe part 12, a second discharge side pipe part 13, a second discharge side flexible pipe part 14, and It is divided into five parts of the three discharge side piping part 15. These connection relationships are as follows. That is, one end of the first discharge side piping part 11 is connected to the discharge port 5 b of the compressor 5. One end of the first discharge side flexible piping portion 12 is connected to the other end of the first discharge side piping portion 11. One end of the second discharge side pipe part 13 is connected to the other end of the first discharge side flexible pipe part 12. One end of the second discharge side flexible piping portion 14 is connected to the other end of the second discharge side piping portion 13. Then, one end of the third discharge side piping part 15 is connected to the other end of the second discharge side flexible piping part 14.

 On the other hand, the suction side connection pipe 20 includes a first suction side pipe part 21, a first suction side flexible pipe part 22, a second suction side pipe part 23, a second suction side flexible pipe part 24, and a third suction side pipe. The part 25 is divided into five parts. These connection relationships are as follows. That is, one end of the first suction side piping section 21 is connected to the suction port 5 c of the compressor 5. One end of the first suction side flexible piping part 22 is connected to the other end of the first suction side piping part 21. One end of the second suction side piping portion 23 is connected to the other end of the first suction side flexible piping portion 22. One end of the second suction side flexible piping portion 24 is connected to the other end of the second suction side piping portion 23. Then, one end of the third suction side piping unit 25 is connected to the other end of the second suction side flexible piping unit 24.

 The first discharge side piping unit 11, the second discharge side piping unit 13, the third discharge side piping unit 15, the first suction side piping unit 21, the second suction side piping unit 23, and the third suction side piping unit 25 are either Is made of copper and cannot substantially absorb the bending due to vibration or the like.

 The 1st discharge side flexible piping part 12, the 2nd discharge side flexible piping part 24, the 1st suction | inhalation side flexible piping part 22, and the 2nd absorption side flexible piping part 24 are piping which can absorb the bending by vibration etc. Composed.

 In the present example, an oil separator 30 is connected to the other end of the third discharge side piping section 15. The oil separator 30 is for separating oil from the refrigerant flowing into the inside. On the other hand, an accumulator 31 is connected to the other end of the third suction side piping section 25 in this example. The accumulator 31 is for gas-liquid separation of the refrigerant flowing into the inside.

 As shown in FIG. 1, an engine fixing bracket 32 is attached to the engine 1. A connecting plate 33 extends from the engine fixing bracket 32, and a pipe fixing bracket 34 is connected and fixed to the connecting plate 33. The pipe fixing bracket 34 fixes both the second discharge side pipe portion 13 of the discharge side pipe 10 and the second suction side pipe portion 23 of the suction side pipe 20. Therefore, the second discharge side piping part 13 and the second suction side piping part 23 are fixed to the engine 1 via the pipe fixing bracket 34, the connecting plate 33, and the engine fixing bracket 32. Reference numeral 35 denotes a vibration isolating rubber for suppressing engine vibration.

 In such a configuration, when the engine 1 is driven and the output shaft 1 a rotates, this rotational force is transmitted from the compressor input shaft 5 a to the compressor 5 via the engine pulley 2, the belt 3 and the compressor pulley 4. Thereby, the compressor 5 operates and compresses the internal refrigerant. The refrigerant compressed by the compressor 5 flows into the oil separator 30 from the discharge port 5b through the discharge side pipe 10, and is separated by the oil separator 30. Thereafter, the oil-separated refrigerant flows through a refrigerant circuit (not shown) and reaches the accumulator 31. Then, the refrigerant is gas-liquid separated by the accumulator 31, and only the gaseous refrigerant returns to the compressor 5 from the suction side pipe 20. In such a circulation process of the refrigerant, the refrigerant performs a condensing action and an evaporating action in a condenser and an evaporator installed in the refrigerant circuit, and air conditioning (by the movement of heat generated by the condensing action or the evaporating action) Cooling or heating) is performed.

 When the engine 1 is driven as described above, it may be necessary to adjust the position of the compressor 5 in order to adjust the tension of the belt 3. When the position of the compressor 5 is adjusted at this time, stress is applied to both the pipes 10 and 20 with the change in the position. In this example, this stress is absorbed by the first discharge-side flexible piping portion 12 and the second discharge-side flexible piping portion 22. That is, even if the position of the compressor 5 is adjusted, the position of the engine 1 does not change, so the position of each bracket (engine fixing bracket 32, pipe fixing bracket 34) fixed to the engine 1 does not change. Accordingly, the positions of the second discharge side pipe part 13 and the second suction side pipe part 23 fixed to the pipe fixing bracket 34 are not changed, and the pipe part movable with respect to the displacement of the compressor is the fixing bracket 34. Only the portion closer to the compressor 5 than the fixed portion is provided. In this portion, the flexible portions are only the first discharge-side flexible piping portion 12 and the first suction-side flexible piping portion 22, so that almost all the bending due to the displacement of the compressor 5 is absorbed by this portion.

 Further, when the engine 1 is driven, the engine 1 vibrates, but this vibration is suppressed by the vibration isolating rubber 35. However, vibrations that are not suppressed by the anti-vibration rubber 35 pass through the engine fixing bracket 32, the connecting plate 33, and the pipe fixing bracket 34, and the second discharge side pipe portion 13 of the discharge side pipe 10 and the second side of the suction side pipe 20. 2 is transmitted to the suction side piping section 23. Accordingly, since the second discharge side piping portion 13 and the second suction side piping portion 23 vibrate with the vibration of the engine 1, the piping portion closer to the compressor 5 than the piping fixing bracket 34 vibrates with the engine 1. For this reason, since the 1st discharge side flexible piping part 12 and the 1st suction | inhalation side flexible piping part 22 vibrate with the engine 1, they cannot absorb the vibration, As a result, the vibration of the engine 1 is the pipe fixing bracket 34. In other words, it must be absorbed only by the pipe portion on the side opposite to the compressor 5 (in this example, closer to the oil separator 30 and closer to the accumulator 31). In this portion, the flexible portions are only the second discharge-side flexible piping portion 14 and the second suction-side flexible piping portion 24, so that almost all of the bending due to the vibration of the engine 1 is absorbed by this portion.

Thus, according to this example, two flexible pipe parts (for the discharge side pipe 10, the first discharge side flexible pipe part 12) are connected to the pipe (discharge side pipe 10 and suction side pipe 20) connected to the compressor 5. And about the 2nd discharge side flexible piping part 14 and the suction side piping part 20, the 1st suction side flexible piping part 22 and the 2nd suction side flexible piping part 24) are provided, and the part of piping between both flexible piping parts ( The second discharge side piping part 13 and the second suction side piping part 23) were connected to the engine 1. By setting it as such a structure, since the 1st discharge side flexible piping part 12 and the 1st suction | inhalation side flexible piping part 22 will vibrate with the engine 1, it cannot absorb the vibration from the engine 1, Only the deflection due to the displacement of the compressor 5 is absorbed. On the other hand, the second discharge-side flexible piping portion 14 and the second suction-side flexible piping portion 24 absorb all of the displacement of the compressor 5 by the first flexible piping portion, and therefore exclusively absorb the deflection caused by the vibration of the engine 1. It will be. That is, by dividing the flexible part in the pipe into two parts and fixing the space between them to the engine 1, each flexible pipe part can be divided into a part dedicated to absorbing displacement and a part dedicated to absorbing vibration. Therefore, it is possible to prevent a situation in which the flexible piping part absorbs the vibration of the engine 1 while being bent for adjusting the positional deviation of the compressor 5, and the vibration can be efficiently absorbed. Further, since the pipe connected to the compressor 5 is fixed not to the outdoor unit housing but to the engine 1, the vibration of the engine 1 is not directly transmitted to the outdoor unit housing. For this reason, generation | occurrence | production of the noise by the micro vibration of an outdoor unit housing can be prevented.

(Application example)
FIG. 2 is a view showing an application example in which the present invention is attached to an actual GHP compressor, and FIGS. 3 and 4 are views showing FIG. 2 from another angle. In this example, four compressors are mounted on one engine. The output shaft of the engine is actually connected to the engine pulley via a clutch. Two belts are hung on the engine pulley, and the compressor pulleys of two compressors are hung on each belt.

  Each of the compressors C1, C2, C3, and C4 is provided with a discharge port and a suction port. A discharge side pipe is attached to each discharge port, and a suction side pipe is attached to each suction port.

 As shown in the figure, the discharge side pipes attached to the compressors C1, C2, C3, C4 include first discharge side pipe portions TH11, TH12, TH13, TH14 directly connected to the discharge ports, and the first discharge side. The first discharge side flexible piping unit THF11, THF12, THF13, THF14 connected to the piping units TH11, TH12, TH13, TH14, and the second discharge side connected to the first discharge side flexible piping unit THF11, THF12, THF13, THF14 Piping portions TH21, TH22, TH23, TH24 are provided.

 Each of the second discharge side piping parts TH21, TH22, TH23, TH24 is connected to one header part H. This header part H is connected to one discharge side communication pipe TR. The discharge side communication pipe TR is further connected to the second discharge side flexible pipe part THF2, and the second discharge side flexible pipe part THF2 is connected to the third discharge side pipe part TH3. Therefore, the second discharge side piping parts TH21, TH22, TH23, TH24 are connected to the second discharge side flexible piping part THF2 via the header part H and the discharge side communication pipe TR.

 As shown in the drawing, the suction side pipes KH1, KH2, KH3, and KH4 include a first suction side pipe part KH11, KH12, KH13, and KH14 directly connected to the suction port, and the first discharge side pipe parts KH11, KH12, First suction side flexible piping parts KHF11, KHF12, KHF13, KHF14 connected to KH13, KH14, and second suction side piping parts KH21, KH22 connected to the first suction side flexible piping parts KHF11, KHF12, KHF13, KHF14, KH23 and KH24 are provided.

 The second discharge side piping parts KH21 and KH22 are joined by the first joining pipe G1. The first junction pipe G1 is connected to the first suction side connection pipe KR1. Further, the first suction side connecting pipe KR1 is connected to the second suction side flexible pipe part KHF21, and the second suction side flexible pipe part KHF21 is connected to the third suction side pipe part KH31. Accordingly, the second suction side piping parts KH21 and KH22 are connected to the second suction side flexible piping part KHF21 via the first merging pipe G1 and the first suction side connecting pipe KR1.

Further, the second discharge side piping parts KH23 and KH24 are joined by the second joining pipe G2. The second junction pipe G2 is connected to the second suction side connection pipe KR2. Further, the second suction side connecting pipe KR2 is connected to the second suction side flexible piping part KHF22, and the second suction side flexible piping part KHF22 is connected to the third suction side piping part KH32. Accordingly, the second suction side piping parts KH23 and KH22 are connected to the second suction side flexible piping part KHF22 via the second junction pipe G2 and the second suction side connecting pipe KR2. A pipe fixing bracket HB is disposed in front of each compressor so as to straddle each first discharge-side flexible piping section and first suction-side flexible piping section. Four fixing plates P1, P2, P3, and P4 are fixed to the pipe fixing bracket HB. The fixed plate P1 has the second discharge side pipe part TH21 and the second suction side pipe part KH21, and the fixed plate P2 has the second discharge side pipe part TH22 and the second suction side pipe part KH22 on the fixed plate P3. The second discharge side piping portion TH23 and the second suction side piping portion KH23 are inserted into the fixing plate P4, and the second discharge side piping portion TH24 and the second suction side piping portion KH24 are respectively inserted into the fixed plate P4. The part is fixed to each fixing plate.

 The pipe fixing bracket HB is fixed to the connection plate RP by fastening means or the like. The connection plate RP is attached to an engine fixing bracket EB that is attached to an engine output shaft and is fixed to the engine.

 In such a configuration, the bending applied to the pipe along with the change of the compressor position for adjusting the belt tension is the first discharge side flexible pipe section (THF11, THF12) disposed closer to the compressor than the pipe fixing bracket HB. .. THF13, THF14) and the first suction side flexible piping (KHF11, KHF12, KHF13, KHF14) absorb almost all.

 Further, when the engine is driven, the engine vibrates, and the bending due to this vibration is caused by the second discharge side flexible piping portion (THF21, THF22, THF23, THF24) and the second disposing side disposed on the side away from the compressor from the piping fixing bracket HB. 2 Absorb almost all at the suction side flexible piping (KHF21, KHF22, KHF23, KHF24).

It is the schematic of the piping structure in embodiment of this invention. It is a perspective view which shows the piping structure of the compressor vicinity in the application example of this invention. It is a perspective view which shows the piping structure shown in FIG. 2 from another angle. It is a perspective view which shows the piping structure shown in FIG.2 and FIG.3 from another angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Engine, 1a: Output shaft, 2: Engine pulley, 3: Belt, 4: Compressor pulley, 5a: Input shaft, 5: Compressor, 5b: Discharge port, 5c: Suction port, 10: Discharge side piping, 11: 1st discharge side piping part, 11a: One end, 11b: The other end, 12: 1st discharge side flexible piping part, 12a: One end, 12b: The other end, 13: 2nd discharge side piping part, 13a: One end, 13b: The other end, 14: second discharge side flexible piping part, 14a: one end, 14b: the other end, 15: third discharge side piping part, 15a: one end, 15b: the other end, 20: suction side piping, 21: first 21a: one end, 21b: the other end, 22: first suction side flexible piping, 22a: one end, 22b: the other end, 23: second suction side piping, 23a: one end, 2 b: other end, 24: second suction side flexible piping, 24a: one end, 24b: other end, 25: third suction side piping, 25a: one end, 25b: other end, 30: oil separator, 31: accumulator 32: Engine fixing bracket, 33: Connecting plate, 34: Piping fixing bracket,

Claims (1)

A connection pipe connected to a prime mover, connected to a compressor that sucks refrigerant from an inlet, compresses the refrigerant inside, and discharges the compressed refrigerant from an outlet;
The connecting pipe comprises a first pipe portion which is connected to the suction port or the discharge port of the compressor, first flexible formed to be absorbed deflection from the outside is connected to the first pipe section comprising a pipe part, and a second pipe portion connected to the first flexible pipe section, and a second flexible pipe portion formed to be absorbed deflection from the outside is connected to the second pipe portion ,
The second piping section is fixed to the prime mover via an engine fixing bracket attached to the prime mover , a connecting plate extending from the engine fixing bracket, and a piping fixing bracket connected and fixed to the connecting plate . Features connecting piping.

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