JP4931684B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus which is used in, for example, an air conditioner, a refrigeration apparatus, and the like and has a function of reducing fluid pressure pulsation of refrigerant accompanying driving of a compressor.

  In the conventional refrigeration cycle apparatus, a pulsation reducer (fluid pressure pulsation absorber) is attached to the discharge side of the compressor in the refrigerant circuit, and the pulsation reducer reduces the fluid pressure pulsation of the refrigerant accompanying the drive of the compressor. (See, for example, Patent Document 1).

JP-A-6-101794

Here, in a general refrigerant circuit, when the refrigerant temperature and the refrigerant pressure change depending on the outside air temperature and the refrigerant flow rate, the speed of sound in the refrigerant (the speed of sound transmitted through the refrigerant) changes with these changes. As a result, the fluid pressure pulsation reduction characteristic unique to the pulsation reducer changes. This reduction characteristic is a characteristic related to the distance from the compressor to the pulsation reducer in the refrigerant circuit and the reduction amount of the fluid pressure pulsation. That is, when the sound speed changes, the amount of fluid pressure pulsation reduced by the pulsation reducer changes.
On the other hand, in the conventional refrigeration cycle apparatus as described above, since the distance from the compressor to the pulsation reducer in the refrigerant circuit is constant, the fluid pressure pulsation by the pulsation reducer is caused by the change in sound speed. The fluid pressure pulsation may cause vibration (resonance) of the heat exchanger located on the refrigerant outflow side of the pulsation reducer in the refrigerant circuit, and noise from the heat exchanger may not be obtained. Will be emitted.

  The present invention has been made to solve the above-described problems, and is stable even when the fluid pressure pulsation reduction characteristic of the pulsation reducer changes in accordance with the change in the speed of sound in the refrigerant. An object of the present invention is to obtain a refrigeration cycle apparatus capable of reducing fluid pressure pulsation of refrigerant.

  A refrigeration cycle apparatus according to the present invention compresses refrigerant, discharges refrigerant, is connected to a compressor that sucks refrigerant, and a compressor, and forms a circulating refrigerant circuit through which refrigerant flows outside the compressor. The refrigerant circuit includes a pulsation reducer that is provided in the refrigerant pipe and the refrigerant circuit and has an expansion chamber that reduces fluid pressure pulsation of the refrigerant flowing through the refrigerant circuit, and the refrigerant circuit is between the discharge side of the compressor and the pulsation reducer. It has a path length changing part that changes the length of the path of the refrigerant circuit.

  In the refrigeration cycle apparatus according to the present invention, the path length of the refrigerant circuit is changed between the discharge side of the compressor and the pulsation reducer by the path length changing unit, so that the pulsation reducer is accompanied by a change in the speed of sound in the refrigerant. Even when the fluid pressure pulsation reduction characteristics of the cylinder change, the length of the path between the compressor and the expansion chamber can be adjusted to the length of the path where the pulsation reduction amount by the pulsation reducer is maximized. As a result, fluid pressure pulsation can be stably reduced.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an air conditioner according to Embodiment 1 of the present invention. FIG. 2 is an enlarged perspective view showing the pulsation reducer 3 of FIG.
In the figure, the compressor 1 has a discharge part 1a and a suction part 1b. The compressor 1 compresses a refrigerant (not shown), discharges the refrigerant from the discharge unit 1a, and sucks the refrigerant from the suction unit 1b. Further, a refrigerant pipe 2 is connected to the compressor 1.

  The refrigerant pipe 2 forms a circulation type refrigerant circuit 2 a from the discharge part 1 a to the suction part 1 b outside the compressor 1. The refrigerant circuit 2a includes a pulsation reducer 3, a four-way valve 4 for switching the path of the refrigerant circuit 2a, an indoor heat exchanger 5 arranged in a temperature management section in the building, and a refrigerant flow rate controlled according to the operating state of the air conditioning. A throttle valve 6 and an outdoor heat exchanger 7 disposed outside the temperature management section are provided. Further, the refrigerant circuit 2 a has a path length changing portion 8 disposed between the discharge portion 1 a of the compressor 1 and the pulsation reducer 3.

  The pulsation reducer 3 has an expansion chamber 3a that reduces fluid pressure pulsation of the refrigerant flowing through the refrigerant circuit 2a. The pulsation reducer 3 has a pair of tapered surface portions 3b and 3c. The length dimension (L1) between the center portions of the respective tapered surface portions 3b and 3c and the diameter dimension of the expansion chamber 3a are a frequency component to be reduced (pulsation frequency component (frequency component depending on the rotational speed of the compressor 1)). Optimized in advance and preset. The four-way valve 4 switches the path of the refrigerant according to cooling and heating. That is, the four-way valve 4 forms a refrigerant path from the pulsation reducer 3 side to the indoor heat exchanger 5 side by switching the refrigerant path (shown by a solid line in FIG. 1), or the pulsation reducer 3 side. A refrigerant path from the outside to the outdoor heat exchanger 7 is formed (indicated by a broken line in FIG. 1).

  The indoor heat exchanger 5 becomes a condenser during heating operation, and condenses the refrigerant received from the pulsation reducer 3 via the four-way valve 4. Moreover, the indoor heat exchanger 5 becomes an evaporator at the time of cooling operation, and evaporates the refrigerant received from the outdoor heat exchanger 7 side. The outdoor heat exchanger 7 becomes an evaporator during heating operation, and evaporates the refrigerant received from the indoor heat exchanger 5 side. Further, the outdoor heat exchanger 7 becomes a condenser during the cooling operation, and condenses the refrigerant received from the pulsation reducer 3 via the four-way valve 4. That is, the indoor heat exchanger 5 and the outdoor heat exchanger 7 perform heat exchange of the refrigerant. Furthermore, the outdoor heat exchanger 7 has a housing (housing; not shown). The compressor 1, a part of the refrigerant pipe 2 (a place excluding the vicinity of the indoor heat exchanger 5), the pulsation reducer 3, the four-way valve 4, the throttle valve 6, and the path length changing unit 8 are the housing of the outdoor heat exchanger 7. Is housed in. The driving of each device and the operation of air conditioning are controlled by an operation control unit (not shown).

  The operation control unit causes the four-way valve 4 to form a refrigerant path from the pulsation reducer 3 side to the indoor heat exchanger 5 side during the heating operation, and the refrigerant discharged from the discharge unit 1a of the compressor 1 is As indicated by the solid line 1, the pulsation reducer 3, the indoor heat exchanger 5, the throttle valve 6, and the outdoor heat exchanger 7 are flowed in this order and sucked into the suction portion 1 b of the compressor 1. On the other hand, during the cooling operation, the operation control unit causes the four-way valve 4 to form a refrigerant path from the pulsation reducer 3 side to the outdoor heat exchanger 7 side, and the refrigerant discharged from the discharge unit 1a of the compressor 1 is As indicated by the broken line in FIG. 1, the pulsation reducer 3, the indoor heat exchanger 5, the throttle valve 6, and the outdoor heat exchanger 7 are flowed in this order and sucked into the suction portion 1 b of the compressor 1.

  FIG. 3 is an enlarged perspective view showing the path length changing portion 8 of FIG. The path length changing unit 8 includes a path branching unit 9 as a path switching unit disposed on the discharge unit 1a side of the compressor 1, a path collecting unit 10 disposed on the pulsation reducer 3 side, a path branching unit 9, It is comprised by the 1st-3rd branch pipes 11-13 which form the path | route of a refrigerant | coolant between the path | route assembly parts 10. FIG. The path branching section 9 has a switching valve that selectively switches the refrigerant path to one of the branch pipes 11 to 13 and path switching drive means that drives the switching valve (both Not shown). The path switching drive means is, for example, a motor, a solenoid, and an operator for operating a worker.

  The both ends of each branch pipe 11-13 are mutually parallel. The shape of the first branch pipe 11 is linear. Further, the length of the refrigerant path by the first branch pipe 11 is shorter than the length of the refrigerant path by the other branch pipes 12 and 13. Further, the intermediate portion of the second branch pipe 12 surrounds the outer peripheral surface of the intermediate portion of the first branch pipe 11 and is wound and bent in a spiral shape in the radial direction. The bent portion of the second branch pipe 12 is a second branch pipe spiral portion 12a (one-dot chain line in the figure). The intermediate portion of the third branch pipe 13 surrounds the outer peripheral surface of the intermediate portion of the first branch pipe 11 and is bent by being wound twice in the radial direction spirally. A bent portion of the third branch pipe 13 is a third branch pipe spiral portion 13a (two-dot chain line in the figure). Further, the length of the refrigerant path by the third branch pipe 13 is longer than the length of the refrigerant path by the other branch pipes 11 and 12. The second and third branch pipe spiral portions 12a and 13a are parallel to each other and adjacent to each other.

  Next, the reduction characteristics of the pulsation reducer 3 will be specifically described. FIG. 4 is a graph showing an example of the reduction characteristics of the pulsation reducer 3 of FIG. In FIG. 4, in the case where the diameter dimension of the expansion chamber 3a is 40 mm and the length dimension of the expansion chamber 3a is 150 mm, the position 7 m from the discharge portion 1a of the compressor 1 in the refrigerant circuit 2a (point A in FIG. 1). ) As an observation point, and shows a reduction characteristic of a component having a frequency of 200 Hz included in the fluid pressure pulsation. 4 represents the distance (m) between the discharge part 1a of the compressor 1 and the pulsation reducer 3, and the vertical axis in FIG. 4 represents the pulsation reduction amount (dB) at the measurement point. Show. Further, in FIG. 4, the fluid pressure pulsation reduction characteristic when the sound speed in the refrigerant is the reference sound speed (1.0 C; C = about 158.2 m / s) is indicated by a solid line, and the sound speed in the refrigerant is 1 from the reference sound speed. The reduction characteristic of fluid pressure pulsation when reduced (0.9C) is indicated by a one-dot chain line, and the reduction characteristic of fluid pressure pulsation when the sound speed in the refrigerant is increased by 10% from the reference sound speed (1.1C) is indicated by a broken line. Show.

  First, when the sound speed in the refrigerant is the reference sound speed, the pulsation is reduced when the distance (L2 shown in FIG. 1) between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 is 0.4 m and 0.8 m. When the distance between the discharge part 1a of the compressor 1 and the pulsation reducer 3 is 0.2 m and 0.6 m, the pulsation reduction amount becomes 0 dB or less and becomes small. Further, when the sound speed in the refrigerant is reduced by 10% from the reference sound speed, the pulsation reduction amount becomes maximum when the distance between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 is 0.37 m. Further, when the sound speed in the refrigerant rises 10% from the reference sound speed, the amount of reduction becomes maximum when the distance between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 is 0.43 m. That is, the position of the pulsation reducer 3 at which the reduction amount is maximum changes by 60 mm between the state where the sound speed in the refrigerant is 10% lower than the reference sound speed and the state where the sound speed in the refrigerant is 10% higher than the reference sound speed.

  Here, the length dimension of the first branch pipe 11 is the dimension (for example, L2 = 0.37 mm) at which the reduction amount of the fluid pressure pulsation by the pulsation reducer 3 is maximized in a state where the sound speed is 10% lower than the reference sound speed. Is set to In addition, the length of the second branch pipe 12 is set to a dimension (for example, L2 = 0.40 mm) that maximizes the reduction amount of the fluid pressure pulsation by the pulsation reducer 3 when the sound speed is the reference sound speed. ing. Further, the length of the third branch pipe 13 is set to a dimension (for example, L2 = 0.43 mm) that maximizes the reduction amount of the fluid pressure pulsation by the pulsation reducer 3 in a state where the sound speed is increased by 10% from the reference sound speed. Is set. That is, the length dimension of each branch pipe 11-13 is set to the dimension corresponding to a different sound velocity, respectively, and the discharge part 1a of the compressor 1 and pulsation by each branch pipe 11-13 and the path | route branch part 9. The length of the path of the refrigerant circuit 2a changes with the reducer 3.

  In the refrigeration cycle apparatus as described above, the path length changing unit 8 changes the path length of the refrigerant circuit 2a between the discharge unit 1a of the compressor 1 and the pulsation reducer 3, so that the speed of sound in the refrigerant changes. Even when the reduction characteristic of the fluid pressure pulsation of the pulsation reducer 3 is changed along with the discharge portion 1a of the compressor 1 and the pulsation, the length of the path where the pulsation reduction amount by the pulsation reducer 3 is maximized. Since the length of the path to the reducer 3 can be adjusted, the fluid pressure pulsation can be stably reduced. Further, the length of the path can be easily switched according to the installation environment and the use environment, and noise emission from the indoor heat exchanger 5 can be suppressed.

  Furthermore, the intermediate part of the second and third branch pipes 12 and 13 is spirally wound around the outer peripheral surface of the central part of the first branch pipe 11, and is formed in parallel and adjacent to each other. A decrease in space efficiency can be suppressed.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. FIG. 5 is a perspective view showing the path length changing unit 8 according to the second embodiment. In the first embodiment, the first to third branch pipes 11 to 13 are used as the branch pipes. However, in the second embodiment, the first to third branch pipes 21 to 23 are used as the branch pipes. Both end portions of the branch pipes 21 to 23 are parallel to each other. The shape of the first branch pipe 21 is linear. The middle portion of the second branch pipe 22 is bent and bent radially outward (up and down in the drawing), and this portion is a second branch pipe bending portion 22a (one-dot chain line in the figure). . The middle part of the third branch pipe 23 is curved outward in the radial direction, and is bent by being wound around the discharge part 1a side of the compressor 1 from the downstream side to the downstream side. It is part 23a (two-dot chain line in the figure). Similar to the branch pipes 11 to 13 of the first embodiment, the length dimensions of the branch pipes 21 to 23 are set to dimensions that maximize the amount of fluid pressure pulsation reduction by the pulsation reducer 3. Other configurations are the same as those in the first embodiment.

  In the air conditioner as described above, even if the second and third branch pipes 22 and 23 have the second and third branch pipe curved portions 22a and 23a, respectively, the same as in the first embodiment The effect of can be obtained.

  In the first and second embodiments, the three branch pipes 11 to 13 and 21 to 23 are used. However, the number is not limited to three, and two or four or more branch pipes may be used.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. FIG. 6 is a side view showing the path length changing unit 8 according to the third embodiment. First, in the first and second embodiments, the refrigerant path by the plurality of branch pipes 11 to 13 and 21 to 23 is selectively switched, so that the gap between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 is changed. However, in the third embodiment, the pulsation reducer 3 is linearly displaced in the refrigerant inflow / outflow direction (left-right direction in the figure), so that the discharge of the compressor 1 is performed. The length of the path of the refrigerant circuit 2a changes between the part 1a and the pulsation reducer 3.

  The path length changing unit 8 according to the third embodiment is attached to the pulsation reducer 3 and a pair of flexible pipes 31 that can be expanded and contracted in the displacement direction of the pulsation reducer 3. The guide mechanism 32 is comprised. Each flexible tube 31 is arranged on both sides of the pulsation reducer 3 in the refrigerant inflow / outflow direction. The flexible tube 31 is, for example, a bellows tube.

  The displacement guide mechanism 32 includes a rail 33 arranged along the direction of the refrigerant (longitudinal direction of the pulsation reducer 3), one end and an intermediate part attached to the pulsation reducer 3, and the other end being a side surface of the rail 33. Reducer mounting plate 34, a travel unit 35 provided on the other end of the reducer mounting plate 34 and capable of traveling on the guide surface of the rail 33, and a reducer driving means for applying a driving force to the pulsation reducer 3. (Not shown) and fixing means (not shown) for fixing the position of the pulsation reducer 3. The reducer driving means is, for example, a motor, a solenoid, an operator for operating a worker, and the like, similarly to the path switching driving means of the first embodiment. That is, the displacement guide mechanism 32 guides the pulsation reducer 3 in the refrigerant inflow / outflow direction, and the pulsation reducer 3 is displaced, whereby the discharge portion 1a of the compressor 1 and the pulsation reducer 3 are displaced. The length of the path of the refrigerant circuit 2a changes between the two. The displacement width of the pulsation reducer 3 is, for example, about 100 mm. Other configurations and operations are the same as those in the first embodiment.

  In the air conditioning apparatus as described above, the pulsation reducer 3 is displaced in the refrigerant inflow / outflow direction, whereby the length of the path of the refrigerant circuit 2a between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 is reduced. Since it changes, the same effect as Embodiment 1 can be acquired.

  Further, since the length of the refrigerant path can be arbitrarily set within the range of displacement of the pulsation reducer 3, the length of the refrigerant path can be changed when the installation environment and the use environment change. Therefore, the length can be adjusted to a length that can secure the maximum reduction amount of the fluid pressure pulsation, and the adjustment accuracy can be improved as compared with the air conditioners of the first and second embodiments.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. FIG. 7 is a configuration diagram illustrating an air-conditioning apparatus according to Embodiment 4. In FIG. A predetermined measurement point is set on the refrigerant inflow side (the refrigerant outflow side during the cooling operation) of the indoor heat exchanger 5 during the heating operation, and a sensor 41 is provided for grasping (measuring) the pulsation state of the refrigerant. It has been. The sensor 41 generates an electrical signal corresponding to any of the pressure, flow velocity, flow rate, temperature of the refrigerant, the pressure on the wall surface of the refrigerant pipe 2, the vibration and distortion of the pipe wall, and the noise near the indoor heat exchanger 5. . The sensor 41 is electrically connected to an arithmetic processing unit 42 as a path length control unit.

  The electric signal generated by the sensor 41 is sent to the arithmetic processing unit 42. The arithmetic processing unit 42 monitors the pulsation state of the refrigerant based on the electrical signal from the sensor 41. Moreover, the arithmetic processing unit 42 controls the length of the path of the refrigerant circuit 2a. Further, the arithmetic processing unit 42 is electrically connected to path switching drive means (motor or solenoid) of the path length changing unit 8. Further, the arithmetic processing unit 42 sends a switching command to the path switching drive means of the path length changing unit 8 according to the pulsation state of the refrigerant being monitored, and causes the path length changing unit 8 to execute the path switching.

  Furthermore, the arithmetic processing unit 42 includes an arithmetic processing unit (CPU), a storage unit (ROM, RAM, hard disk, etc.), and a signal input / output unit (all not shown). The storage unit of the arithmetic processing device 42 stores a program for realizing the functions of the arithmetic processing device 42.

  Here, when the monitoring target by the arithmetic processing unit 42 is the pressure, flow velocity, flow rate, or temperature of the refrigerant, the sensor 41 is attached inside the refrigerant pipe 2 so as to be in direct contact with the refrigerant. When the monitoring target by the arithmetic processing unit 42 is pressure on the wall surface of the refrigerant pipe 2, vibration or distortion of the tube wall, the sensor 41 is a pressure sensor, a vibration acceleration sensor, or a distortion sensor. It is attached to the surface of the pipe wall of the refrigerant pipe 2. Furthermore, when the monitoring target by the arithmetic processing unit 42 is noise in the vicinity of the indoor heat exchanger 5, the sensor 41 is provided in the vicinity of the indoor heat exchanger 5 outside the refrigerant pipe 2. Other configurations are the same as those in the first embodiment or the second embodiment.

  Next, the path length control by the arithmetic processing unit 42 will be described more specifically. The arithmetic processing unit 42 performs a Fourier transform on the signal obtained by the sensor 41 to calculate a power spectrum. Then, the arithmetic processing unit 42 calculates the fluctuation energy level based on the power spectrum, and determines whether the fluctuation energy level of the frequency or frequency band (pulsation frequency) to be reduced is equal to or higher than the specified value or less than the specified value. To do. At this time, if the fluctuating energy level is equal to or higher than the specified value, the arithmetic processing unit 42 sends a switching command to the path length changing unit 8 so as to execute switching of the path of the refrigerant circuit 2a. The path length changing unit 8 switches the path length of the refrigerant circuit 2a based on the switching command.

  In addition, the arithmetic processing unit 42 issues a switching command to the path length changing unit 8 (regardless of whether or not the fluctuation energy level is equal to or higher than a specified value) at predetermined time intervals or when the operation is changed. For each path length of the circuit 3a, a power spectrum, a pulsation reduction amount, a fluctuating energy level, and the like are calculated, and the length of the refrigerant circuit 2a is adjusted (tuned) so that the fluid pressure pulsation is near the minimum.

  In the air conditioner as described above, the path of the refrigerant circuit 2a is arranged between the discharge unit 1a of the compressor 1 and the pulsation reducer 3 in accordance with the fluid pressure pulsation state of the refrigerant monitored by the arithmetic processing unit 42. Since the length is changed, the distance between the discharge part 1a of the compressor 1 and the pulsation reducer 3 can be automatically changed, and the fluid pressure pulsation can be reduced more stably.

  Further, since the fluid pressure pulsation of the refrigerant is monitored on the upstream side (downstream side during the cooling operation) of the indoor heat exchanger 5 of the refrigerant circuit 2a, the indoor heat exchanger 5 and its housing are monitored by the fluid pressure pulsation. Can be efficiently prevented from being vibrated.

  In the fourth embodiment, the predetermined measurement point is set on the refrigerant inflow side during the heating operation of the indoor heat exchanger 5. However, the predetermined measurement point is not limited to this example, and the pulsation reducer. May be set on the refrigerant outflow side. For example, the predetermined measurement point may be set on the refrigerant outflow side during the heating operation of the indoor heat exchanger. Further, the predetermined measurement point may be set on the refrigerant outflow side during the heating operation of the outdoor heat exchanger. Furthermore, a plurality of measurement points may be provided in the refrigerant circuit. In the case where a plurality of measurement points are provided in the refrigerant circuit, the measurement points may be switched according to the operation status of the air conditioning to monitor the fluid pressure pulsation of the refrigerant.

  Furthermore, in the fourth embodiment, the path length of the refrigerant circuit 2a is changed via the path length changing unit 8 of the first or second embodiment, but the path length of the third embodiment is changed. The path length of the refrigerant circuit may be changed via the changing unit 8.

  Moreover, although Embodiment 1-4 demonstrated the air-conditioning harmony apparatus, this invention is applicable also to refrigeration apparatuses, such as a refrigerator, a freezer, and a heat pump type hot water heater outdoor heat exchanger. In this case, for example, the four-way valve 4 in FIG. 1 can be deleted, the indoor heat exchanger 5 can be a condenser, and the outdoor heat exchanger 7 can be an evaporator.

  Further, in Embodiments 1 to 4, the pulsation reducer 3 and the path length changing unit 8 are accommodated in the housing of the outdoor heat exchanger 7, but the pulsation reducer may be disposed outside. As a result, even if the pulsation reducer and the path length changing part cannot be accommodated in the housing of the existing outdoor heat exchanger, it becomes possible to add the pulsation reducer and the path length changing part to the existing product. Noise emission from the existing indoor heat exchanger can be suppressed.

It is a block diagram which shows the air conditioning apparatus by Embodiment 1 of this invention. It is a perspective view which expands and shows the pulsation reducer of FIG. It is a perspective view which expands and shows the path | route length change part of FIG. It is a graph which shows an example of the reduction characteristic of the pulsation reducer of FIG. It is a perspective view which expands and shows the path length change part by Embodiment 2 of this invention. It is a side view which expands and shows the path length change part by Embodiment 3 of this invention. It is a block diagram which shows the air conditioning apparatus by Embodiment 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Compressor, 1a Discharge part, 1b Suction part, 2 Refrigerant piping, 2a Refrigerant circuit, 3 Pulsation reducer, 3a Expansion room, 5 Indoor heat exchanger, 7 Outdoor heat exchanger, 8 Path length change part, 9 Path branch Part (path switching means), 11, 21 1st branch pipe, 12, 22 2nd branch pipe, 13, 23 3rd branch pipe, 31 flexible pipe, 32 displacement guide mechanism, 41 sensor, 42 arithmetic processing unit (path length) Control unit).

Claims (5)

A compressor that compresses the refrigerant, discharges the refrigerant, and sucks the refrigerant;
Refrigerant piping connected to the compressor and forming a circulating refrigerant circuit through which the refrigerant flows outside the compressor, and fluid pressure pulsation of the refrigerant flowing in the refrigerant circuit provided in the refrigerant circuit is reduced. A pulsation reducer with an expansion chamber
The refrigerant circuit has a path length changing unit that changes the length of the path of the refrigerant circuit between the discharge side of the compressor and the pulsation reducer ,
The path length changing unit is disposed between the discharge side of the compressor and the pulsation reducer, and has a plurality of branch pipes having different path lengths, the discharge side of the compressor, and the pulsation reducer. A refrigeration cycle apparatus comprising: a path switching unit that selectively switches a path of the refrigerant circuit between the two to one of the branch pipes . A compressor that compresses the refrigerant, discharges the refrigerant, and sucks the refrigerant;
A refrigerant pipe connected to the compressor and forming a circulation type refrigerant circuit through which the refrigerant flows outside the compressor; and
A pulsation reducer having an expansion chamber that is provided in the refrigerant circuit and reduces fluid pressure pulsation of the refrigerant flowing through the refrigerant circuit.
With
The refrigerant circuit has a path length changing unit that changes the length of the path of the refrigerant circuit between the discharge side of the compressor and the pulsation reducer,
The pulsation reducer is displaceable on both sides of the flow direction of the refrigerant,
The path length changing unit is composed of a pair of flexible tubes that can be expanded and contracted in the displacement direction of the pulsation reducer, and a displacement guide mechanism that guides the displacement of the pulsation reducer.
The pair of flexible tubes are respectively disposed on both sides of the flow direction of the refrigerant of the pulsation reducer. On the refrigerant outflow side of the pulsation reducer of the refrigerant circuit, an outdoor heat exchanger that has a housing and is installed outside the temperature management section of the building and performs either one of condensation or evaporation of the refrigerant, and An indoor heat exchanger that is installed in the temperature control section and performs the other of the condensation and evaporation of the refrigerant is connected,
The refrigeration cycle apparatus according to claim 1 or 2, wherein the compressor and the pulsation reducer are accommodated in the housing. On the refrigerant outflow side of the pulsation reducer of the refrigerant circuit, an outdoor heat exchanger that has a housing and is installed outside the temperature management section of the building and performs either one of condensation or evaporation of the refrigerant, and An indoor heat exchanger that is installed in the temperature control section and performs the other of the condensation and evaporation of the refrigerant is connected,
The refrigeration cycle apparatus according to claim 1 or 2 , wherein the pulsation reducer is disposed outside the housing. A sensor for grasping the pulsation state of the refrigerant at a predetermined measurement point provided on the refrigerant outflow side of the pulsation reducer;
And a path length control unit that is electrically connected to the sensor, monitors a pulsation state of the refrigerant via the sensor, and controls driving of the path length changing unit. refrigeration cycle apparatus according to any one of the claims 4 or from claim 1.

Images