JP2007198698A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner, capable of saving the space for a piping structure and adequately taking a measure against noise by vibration of a compressor by preventing unwanted contact of pipes connected to a four-way valve with the compressor. <P>SOLUTION: This air conditioner comprises the compressor 23 performing compression of refrigerant; and the four-way valve 25 for switching refrigerant passages, the valve being connected with a pipe 11 constituting a refrigerant passage to the discharge side of the compressor 23, a pipe 12 constituting a refrigerant passage for returning the refrigerant to the compressor 23 through an accumulator 23, a pipe 13 constituting a refrigerant passage to an outdoor heat exchanger 22, and a pipe 14 constituting a refrigerant passage to an indoor heat exchanger (not shown) through a stop valve 26. The pipes 12, 13 and 14 extending in the same direction from the four-way valve 25 are arranged so as to extend upwardly from the four-way valve 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to a piping structure of an outdoor unit of a heat pump type air conditioner.

  The piping structure of the air conditioner in the prior art is a piping structure as described in Patent Document 1 as a conventional example.

JP-A-9-144661 (second page, FIG. 4)

The piping structure of an air conditioner in Patent Document 1 has the same configuration except for FIG. 1 showing Embodiment 1 according to the present invention and the core of the present invention.
In FIG. 1, the compressor 23 is elastically supported by a metal substrate 27 of an air conditioner via a vibration isolator, and a four-way valve 25 is disposed below the lateral side thereof. The four-way valve 25 and the compressor 23 are connected by a discharge pipe 11 and a suction pipe 12, and an accumulator 24 is connected in the middle of the suction pipe 12 that is a refrigerant pipe connecting the four-way valve 25 and the compressor 23. Further, the four-way valve 25 and the heat exchanger 22 are connected via the pipe 13, and the four-way valve 25 and the stop valve 26 are connected via the pipe 14.

  The operation will be described by taking the cooling operation as an example. The refrigerant discharged by the compressor 23 passes through the discharge pipe 11, the four-way valve 25, the pipe 13, the outdoor heat exchanger 22, and the pipe 28 according to the switching setting of the four-way valve 25. It is sent to an exchanger (not shown), and returned from the indoor heat exchanger (not shown) to the compressor 23 through the stop valve 26, the pipe 14, the four-way valve 25, the suction pipe 12, the accumulator 24, and the pipe 15.

Next, the piping configuration will be described. Unlike the configuration of FIG. 1 showing the first embodiment according to the present invention, the four-way valve 25 is arranged at the upper part on the side of the compressor 23 in the conventional technique shown in Patent Document 1. Three connecting pipes 12 a, 13 a, 14 a extending in the same direction from 25 are arranged in a direction extending downward from the four-way valve body 25, and the piping 13, four-way from the suction pipe 12, the four-way valve 25 to the heat exchanger 22 is arranged. It is connected to the pipe 14 from the valve 25 to the stop valve 26.
Further, the connecting pipe 11a extending upward from the four-way valve 25 is bent downward by 180 ° bending and extends to almost the same height as the other three connecting pipes 12a, 13a, and 14a. 11 is connected.

Here, since the discharge pipe 11, the suction pipe 12, and the pipe 13 to the heat exchanger 22 extend downward from the four-way valve 25, the direction is changed upward by bending 180 degrees on the lower side of the compressor 23. Thereafter, it is further bent and connected to the connecting portion of the compressor 23, the accumulator 24, and the heat exchanger 22.
The pipe 14 from the four-way valve to the stop valve is connected to the stop valve by bending a pipe extending downward from the four-way valve toward the stop valve.

  In the air conditioner, when the compressor 23 is driven to compress and discharge the refrigerant, vibration is generated from the compressor 23. This vibration is propagated through the discharge pipe 11 or the suction pipe 12 to the outdoor heat exchanger 22, the stop valve 26, or the outer box 29 attached to the outdoor unit.

The vibration propagated in this way vibrates the outdoor heat exchanger 22, the stop valve 26, and the outer box 29 to generate noise.
In particular, as the total length of the pipes from the compressor 23 and accumulator 24 to the heat exchanger 22 or the stop valve 26 becomes shorter, the rigidity of the whole pipe increases, and the resonance frequency of the compressor 23 increases and the operating frequency of the compressor 23 increases. Since the vibration due to the resonance of the compressor 23 is transmitted during the operation of the air conditioner to cause a problem of noise, the total length of the pipe length is the frequency of the resonance point of the compressor 23. The length is less than the minimum operating frequency.
Further, in order to further improve the quietness, the discharge pipe 11 and the suction pipe 12 are further lengthened and arranged in a U-shape around the compressor 23 so that the vibration is gradually attenuated.
Further, when discharged from the compressor 23, the refrigerant generates sound inside the pipe. There is a phenomenon that this sound is transmitted through the pipe and can be heard from the indoor unit.
To reduce this, install a muffler in the middle of the piping. The installation place of the muffler is generally installed between the discharge pipe 11 or the pipe 14 from the four-way valve 25 to the stop valve 26, or both of them.

And the 2nd prior art example with a piping structure in the case of installing such a muffler exists separately from the 1st prior art example mentioned above.
The piping structure of the air conditioner in the second conventional example has the same configuration except for FIG. 2 showing the second embodiment according to the present invention and the core part of the present invention.
In the second conventional example, as shown in FIG. 2, the muffler 15 is installed in the middle of the pipe 14 from the four-way valve 25 to the stop valve 26.
Since the pipe 14 from the four-way valve 25 to the stop valve 26 has no distance to install the muffler 15 between the connection portion 16 of the four-way valve 25 and the stop valve 26, the pipe 14 extending downward from the four-way valve 25 is 180 degrees. The muffler 15 is installed by bending upwards, changing the direction upward and extending to the upper part, and then bending downward by 180 degrees.

  In the air conditioner in the first conventional example, the three-way pipes 12, 13, and 14 that extend in the same direction from the four-way valve main body 25 to the lateral upper part of the compressor 23 are the four-way valve main body 25 as described above. Since the discharge pipe 11 and the suction pipe 12 extending downward from the four-way valve 25 and the pipe 13 leading to the heat exchanger are bent upwards by about 180 degrees. In order to connect the pipe to the compressor or the heat exchanger, at least three bending spaces and a space for the pipe to pass upward are required.

  In the air conditioner according to the second conventional example, in order to attach the muffler 15 to the pipe 14, the pipe 14 extending downward from the four-way valve 25 is bent upward by 180 ° bending, and the height of the upper portion of the compressor 23 is further increased. In order to bend 180 degrees and change the direction downward, the muffler 15 is installed, and in addition to the bending of the first conventional example, two bending spaces of 180 degrees and a space through which piping passes are required.

If the number of times the direction of the pipe is changed by bending the pipe as described above is increased, the number of pipes that go up and down increases, so that the space for the pipe in the lateral direction of the outdoor unit increases and the entire outdoor unit Can not be reduced. Alternatively, when piping is connected in a limited space, the bending of the piping is arranged so as to surround the outer periphery of the compressor 23, so the gap between the piping and the compressor 23 is narrowed, and the piping or between the compressor 23 and the piping May come into contact.
Further, as a problem when the pipe length is shortened in order to reduce the size of the outdoor unit, as the total length of the pipe length from the compressor 23 and the accumulator 24 to the heat exchanger 22 or the stop valve 26 is shortened, the pipe is shortened. Since the overall rigidity increases, the resonance frequency of the compressor 23 rises and becomes higher than the minimum value of the operating frequency of the compressor 23, and the vibration generated by the compressor 23 during operation causes a noise problem. There is a fear.

  Accordingly, an object of the present invention is to provide an air conditioner that can save space in the piping configuration, and that the piping connected to the four-way valve does not make unnecessary contact with the compressor, and that can accurately take measures against noise caused by compressor vibration. It is to provide.

  In the air conditioner according to the present invention, there is provided a refrigerant path for circulating the refrigerant to the compressor via the compressor that compresses the refrigerant, the first pipe that constitutes the refrigerant path to the discharge side of the compressor, and the accumulator. The refrigerant pipe is connected to the second pipe constituting the refrigerant, the third pipe constituting the refrigerant path to the first heat exchanger, and the fourth pipe constituting the refrigerant path to the second heat exchanger. A four-way valve is provided, and the second pipe, the third pipe, and the fourth pipe extending in the same direction from the four-way valve are arranged in a direction extending upward from the four-way valve.

  According to the present invention, it is possible to provide an air conditioner that can save space in the piping configuration, and that pipes connected to the four-way valve do not make unnecessary contact with the compressor, and that can appropriately take noise countermeasures due to compressor vibration. be able to.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1 is a block diagram showing a piping structure around a compressor according to an outdoor unit of an air conditioner according to Embodiment 1. FIG. FIG. 4A is a characteristic curve diagram showing the relationship between the pipe length and the compressor resonance frequency. FIG. 4B is an explanatory diagram showing the number of times the pipe needs to be bent.

  As shown in FIG. 1, the vertically placed compressor 23 is elastically supported via a vibration isolating material on a metal substrate 27 disposed inside an outer box 29 of an outdoor unit in an air conditioner. A four-way valve 25 is disposed on the lower side. The four-way valve 25 is arranged in a direction in which three connection pipes 12a, 13a, and 14a extending in the same direction from the four-way valve body extend upward from the four-way valve body. The four-way valve 25 and the discharge side of the compressor 23 are connected by a discharge pipe 11 and a connection pipe 11a. The four-way valve 25 and the suction side of the compressor 23 are connected by a suction pipe 12 and a connection pipe 12a. An accumulator 24 is connected in the middle of the suction pipe 12 which is a refrigerant pipe connecting the compressor 23. Furthermore, the four-way valve 25 and the heat exchanger 22 are connected by a pipe 13 and a connecting pipe 13a, and the four-way valve 25 and a stop valve 26 are connected by a pipe 14 and a connecting pipe 14a.

  The operation will be described by taking the cooling operation as an example. The refrigerant discharged by the compressor 23 passes through the discharge pipe 11, the four-way valve 25, the pipe 13, the outdoor heat exchanger 22, and the pipe 28 according to the switching setting of the four-way valve 25. It is sent to an exchanger (not shown), and returned from the indoor heat exchanger (not shown) to the compressor 23 through the stop valve 26, the pipe 14, the four-way valve 25, the suction pipe 12, the accumulator 24, and the pipe 15.

  Here, the general shape of the four-way valve 25 will be described. The four-way valve 25 is attached to the outer box 29 of the air conditioner and is disposed in a state of being housed in the outer box 29, and is formed in a cylindrical body. Four pipes 11a, 12a, 13a, 14a for connecting to the discharge pipe 11, the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 are attached. Of these four connecting pipes 11a, 12a, 13a, 14a, three of connecting pipes 12a, 13a, 14a connected to the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 are provided. Are attached in the same direction, the connecting pipe 11a connected to the discharge pipe 11 is attached in the opposite direction to those three, and the connecting portion 16 is bent by 180 degrees to connect the other three connecting pipes 12a and 13a. , 14a.

In the outdoor unit of the air conditioner according to Embodiment 1, the compressor 23 is placed vertically, and the four-way valve 25 is arranged so that the openings of the connection pipes 11a, 12a, 13a, 14a face upward at the lower side of the compressor 23. The pipes 11, 12, and 13 are linearly extended from the four-way valve to the height of the upper part of the compressor, bent by 90 degrees, bent in the direction of the connecting portion of the compressor 23 and the heat exchanger 22, and further compressed by bending by 90 degrees. The machine 23 and the heat exchanger 22 are connected.
The pipe 14 extends upward from the four-way valve 25, is bent downward by a 180 degree bend, and is then connected to the stop valve 26 by a 90 degree bend.
Further, the ratio of the lengths of the respective pipes in the first embodiment is approximately as follows. The length of the discharge pipe 11 is about 300 mm. If this is 1, the length of the suction pipe 12 is 1, the length of the pipe 13 from the four-way valve 25 to the heat exchanger 22 is 1, and the stop valve is from the four-way valve 25 to the stop valve. The length of the pipe 14 to 26 is two.
Similarly, the ratio of the pipe length in the conventional embodiment is that the length of the discharge pipe 11 in the first embodiment is 1, and the length of the discharge pipe 11 in the conventional embodiment is 2, The length is 2, the length of the pipe 14 from the four-way valve 25 to the heat exchanger 22 is 0.5, and the length of the pipe 14 from the four-way valve 25 to the stop valve 26 is 1.

In this air conditioner, the pipes 11, 12, 13 connected to the four-way valve 25 are bent only 90 degrees except for the bending for connecting the upper part of the compressor. Therefore, it is not necessary to arrange a U-bending pipe around the compressor 23 as in the conventional pipe, and the pipe space is smaller than the conventional pipe.
Further, since there is no bent portion of the discharge pipe 11 and the suction pipe 12 on the side of the compressor 23, there is no possibility that the pipe contacts the compressor 23 or the pipes contact each other.
In addition, the length of the discharge pipe 11 and the suction pipe 12 is ½ that is shorter than before, but the piping from the four-way valve 25 to the heat exchanger 22 and the piping 14 from the four-way valve 25 to the stop valve 26 are conventional. The total length of the pipe is almost the same as the conventional length because it is twice as long.
Further, the rigidity of the pipe is proportional to the cube of the length, so that the discharge pipe 11 and the suction pipe 12 are (1/2) ³ or 1/8, but from the four-way valve 25 to the heat exchanger 22. the pipe 13 and the pipe 14 is the overall stiffness of the pipe than to the 8-fold 2 ³ clogging from the four-way valve 25 to the stop valve 26 becomes equal to that of the conventional. Therefore, since the resonance frequency of the compressor 23 does not increase and does not exceed the minimum value of the operation frequency, noise caused by vibration due to resonance of the compressor 23 does not become a problem.

For example, the characteristic curve in FIG. 4A shows the total length of the discharge pipe 11 and the suction pipe 12, the length of the pipe 13 from the four-way valve 25 to the heat exchanger 22, and the length of the pipe 14 from the four-way valve 25 to the stop valve 26. The resonance frequency of the compressor 23 that transmits the pipe when the total is changed is shown.
A curve CF indicated by a dotted line in FIG. 4A indicates the total length of the discharge pipe 11 and the suction pipe 12 when the resonance frequency of the compressor 23 is 25 Hz, and the pipe 13 from the four-way valve 25 to the heat exchanger 22. The relationship with the sum total of the length of the piping 14 from the four-way valve 25 to the stop valve 26 is shown. Since the minimum operating frequency of the compressor 23 of the outdoor air conditioner is normally set to 25 Hz to 30 Hz, the piping structure having a resonance frequency higher than the curve CF shown by the dotted line, that is, a characteristic point located below the curve CF is 25 Hz or more. A pipe structure having a resonance frequency generates noise due to vibration caused by resonance of the compressor 23 during operation of the air conditioner.

The piping structure in the first embodiment is the point shown in (b) in FIG. 4A, and the first conventional example is the point shown in (d). In both cases, the resonance frequency is 20 Hz lower than the dotted line.
In addition, the table in FIG. 4B shows the minimum number of pipe bendings required for each pipe length from (a) to (g). From this table, it is clear that the piping structure in Embodiment 1 corresponds to the piping structure shown upward (b) toward the connecting piping of the four-way valve, and the number of bendings is the smallest.

  In the first embodiment, the four-way valve 25 has a metal substrate 27 for fixing the compressor 23 to the side of the compressor 23 and a predetermined space below the center of the compressor 23 while maintaining a predetermined space. In combination with the above-described piping configurations in the pipes 11, 12, 13, and 14, the configuration can realize space saving while sufficiently suppressing the influence of vibration by the compressor 23.

(1A) According to the first embodiment of the present invention, the compressor 23 that compresses the refrigerant, the fixing member that includes the metal substrate 27 for fixing the compressor 23, and the discharge side of the compressor 23 1st heat exchanger which consists of the 2nd piping 12 and the outdoor heat exchanger 22 which comprise the refrigerant | coolant path | route which circulates a refrigerant | coolant to the said compressor 23 via the 1st piping 11 and the accumulator 24 which comprise this refrigerant | coolant path | route The third pipe 13 constituting the refrigerant path to the second pipe 14 and the fourth pipe 14 constituting the refrigerant path to the second heat exchanger consisting of the indoor heat exchanger (not shown) via the stop valve 26 The four-way valve 25 is connected and switches the refrigerant path. The four-way valve 25 is below the center of the compressor 23 while maintaining a predetermined space and a fixing member made of a metal substrate 27 on the side of the compressor 23. Arranged from the four-way valve 25 Since the second pipe 12, the third pipe 13, and the fourth pipe 14 extending in the direction are arranged so as to extend upward from the four-way valve 25, the piping configuration can be saved and the four-way valve 25 It is possible to provide an air conditioner in which connected piping does not make unnecessary contact with the compressor 23 and can accurately take measures against noise caused by vibration of the compressor 23.
That is, in the outdoor unit, at least the outdoor heat exchanger 22, a compressor 23 that compresses the refrigerant, an accumulator 24 that is attached to a side portion of the compressor 23 and performs gas-liquid separation of the refluxed refrigerant, and a compressor In the air conditioner having a metal substrate 27 for fixing 23 and a four-way valve 25 for switching the refrigerant flow path, the four-way valve 25 fixes the compressor 23 beside the compressor 23 and the accumulator 24. A direction in which three pipes 12, 13, and 14 that are arranged below the center of the compressor 23 and extend in the same direction from the four-way valve 25 extend upward from the four-way valve 25 are provided with a space that does not contact the metal substrate 27. Therefore, the discharge pipe 11, the suction pipe 12, and the pipe 13 from the four-way valve 25 to the heat exchanger 22 that are pipes from the four-way valve 25 to the compressor 23 are not looped. Made is space for extending into bending the vertical direction of the pipe of the pipe for which it is possible to save space than conventional to reduce. Therefore, it is possible to reduce the size of the outdoor unit and meet market demands, and at the same time reduce the material cost of the outdoor unit. In addition, the pipe lengths of the discharge pipe 11 and the suction pipe 12 are shorter than those of the conventional one, but the pipe 13 from the four-way valve 25 to the heat exchanger 22 and the pipe 14 from the four-way valve 25 to the stop valve 26 are long and compressed. The resonance frequency of the machine 23 becomes high and does not become a problem of noise.

(1B) According to Embodiment 1 of the present invention, in the configuration of the item (1A), the first pipe 11 extending from the four-way valve 25 to the compressor 22 and the second pipe extending from the four-way valve 25 to the accumulator 24. Since the pipe 12 has no bend that changes the direction in the vertical direction around the side surface of the compressor 23, the pipe configuration can be saved, and the pipe connected to the four-way valve 25 is unnecessary with the compressor 23. It is possible to provide an air conditioner that can accurately take measures against noise due to vibrations of the compressor 23 without making contact.
That is, in this air conditioner, at least the outdoor heat exchanger 22, the compressor 23 that compresses the refrigerant, and the side part of the compressor 23 are attached to the outdoor unit to perform gas-liquid separation of the refluxed refrigerant. Since the accumulator 23 and the four-way valve 25 for switching the refrigerant flow path are provided, the outdoor unit can save space as shown in the section (1A), and the pipe connected from the four-way valve 25 to the compressor 23 Since the discharge pipe 11 and the suction pipe 12 are not bent into a U shape around the compressor 23, the compressor 23 and the four-way valve 25 can be arranged closer to each other than the conventional compressor 23. Since it becomes easy to secure the distance between the discharge pipe 11 and the compressor 23 and the suction pipe 12, there is no fear of contact between them and the contact between the discharge pipe 11 and the suction pipe 12.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a piping structure around a compressor of an outdoor unit of an air conditioner according to Embodiment 2 of the present invention.

  As shown in FIG. 2, the compressor 23 is elastically supported by a metal substrate 27 of the air conditioner via a vibration isolator, and a four-way valve 25 is disposed below the lateral side thereof. The four-way valve 25 and the compressor 23 are connected by a discharge pipe 11 and a suction pipe 12, and an accumulator 24 is connected in the middle of the suction pipe 12 that is a refrigerant pipe connecting the four-way valve 25 and the compressor 23. Further, a four-way valve 25 and a heat exchanger 22 are connected via a pipe 13. Moreover, although the four-way valve 25 and the stop valve 26 are connected by the piping 14, the muffler 15 for reducing the sound generated by the refrigerant when discharged from the compressor 23 is installed.

Here, the general shape of the four-way valve 25 will be described. A connection for connecting the discharge pipe 11, the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 to the cylindrical main body. Four tubes 11a, 12a, 13a, and 14a are attached. Of these four pipes, three pipes 12a, 13a, 14a connected to the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 are attached in the same direction. The connecting pipe 11a connected to the discharge pipe 11 is attached in a direction opposite to those three, and the connecting portion 16 is positioned almost at the same position as the other three connecting pipes 12a, 13a, and 14a by bending 180 degrees. It is like that.
Then, after the pipe 14 extending from the four-way valve 25 to the stop valve 26 extending upward from the four-way valve 25 extends to the height of the upper portion of the compressor 23 and is turned downward by 180 degrees, the muffler 15 is attached. A stop valve 26 is connected.

(2A) According to Embodiment 2 of the present invention, in the configuration of (1A) or (1B) in Embodiment 1, the stop valve 26 provided in the fourth pipe 14 is provided, Since the muffler 15 is provided between the four-way valve 25 and the stop valve 26, the piping configuration can be saved, and the pipe connected to the four-way valve 25 does not make unnecessary contact with the compressor. It is possible to provide an air conditioner capable of accurately taking measures against noise caused by vibration.
That is, in this air conditioner, at least the outdoor heat exchanger 22, the compressor 23 that compresses the refrigerant, and the side part of the compressor 23 are attached to the outdoor unit to perform gas-liquid separation of the refluxed refrigerant. An accumulator 24 and a four-way valve 25 for switching the refrigerant flow path are provided. The four-way valve 25 is disposed on the lower side of the compressor 23, and three pipes extending in the same direction from the four-way valve main body 25 are disposed so as to extend upward from the four-way valve 25. A muffler is installed in the middle of the pipe 26 from the four-way valve 25 to the stop valve. Therefore, in this air conditioner, as shown in the item (1A), the discharge pipe 11, the suction pipe 12, and the pipe from the four-way valve 25 to the heat exchanger 22 need not be bent by 180 degrees, and the four-way valve 25 Since the 180 degree bend can be reduced once compared with the conventional pipe from the pipe to the stop valve 26, the effect of space saving is greater.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a piping structure around a compressor of an outdoor unit of an air conditioner according to Embodiment 3 of the present invention.

  As shown in FIG. 3, the compressor 23 is elastically supported by a metal substrate 27 of the air conditioner via a vibration isolator, and a four-way valve 25 is disposed below the lateral side thereof. The four-way valve 25 and the compressor 23 are connected by a discharge pipe 11 and a suction pipe 12, and an accumulator 24 is connected in the middle of the suction pipe 12 that is a refrigerant pipe connecting the four-way valve 25 and the compressor 23. Further, a four-way valve 25 and a heat exchanger 22 are connected via a pipe 13. Moreover, although the four-way valve 25 and the stop valve 26 are connected by the piping 14, the muffler 15 for reducing the sound generated by the refrigerant when discharged from the compressor 23 is installed.

  Here, the general shape of the four-way valve 25 will be described. A connection for connecting the discharge pipe 11, the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 to the cylindrical main body. Four tubes 11a, 12a, 13a, and 14a are attached. Of these four pipes, three pipes 12a, 13a, 14a connected to the suction pipe 12, the pipe 13 to the heat exchanger 22, and the pipe 14 to the stop valve 26 are attached in the same direction. The connecting pipe 11a connected to the discharge pipe 11 is attached in a direction opposite to those three, and the connecting portion 16 is positioned almost at the same position as the other three connecting pipes 12a, 13a, and 14a by bending 180 degrees. It is like that.

In the outdoor unit for an air conditioner according to Embodiment 3, the compressor 23 is placed vertically, and the four-way valve 25 is arranged at the lower side of the compressor 23 so that the openings of the connecting pipes 12a, 13a, 14a face upward. The discharge pipe 11 and the pipe 13 from the four-way valve 25 to the heat exchanger 22 extend upward from the four-way valve 25 to the height above the compressor 23, and are connected to the compressor 23 and the heat exchanger 22 by bending 90 degrees. Is connected to the compressor 23 and the heat exchanger 22.
Further, as shown in FIG. 3, the suction pipe 12 extending upward from the four-way valve 25 extends straight up to the height of the upper portion of the compressor 23, changes its direction downward by bending 180 degrees, and extends to the lower portion of the compressor 23. The direction is changed upward by bending again by 180 degrees and extends to the upper part of the compressor 23 to be connected to the compressor 23. The length of the second pipe 12 connected from the accumulator 24 to the four-way valve 25 is from the first pipe 11 connected to the discharge side of the compressor 23 from the four-way valve 25 and the four-way valve 25. A third pipe 13 connected to the first heat exchanger comprising the outdoor heat exchanger 22 and a pipe connected to the other four-way valve 25 and a fourth pipe connected from the four-way valve 25 to the stop valve 26 The second pipe 12 that is longer than the pipe and extends upward from the four-way valve 25 is bent downward, and further bent upward, and then connected to the compressor 23 via the accumulator 24. Then, the pipe 14 extending from the four-way valve 25 to the stop valve 26 extending upward from the four-way valve 25 extends to the height of the upper portion of the compressor 23 and is turned downward by bending 180 degrees. After the fuller 15 is attached, it is connected to the stop valve 26.

In the third embodiment, the suction pipe 12 connected to the four-way valve 25 in this air conditioner has two 180 degree bends, and the pipe 14 from the four-way valve 25 to the stop valve 26 is also one 180 degree. Since there is a bend, a space for these bent portions is required. However, in the conventional configuration having the muffler 15 between the four-way valve 25 and the stop valve 26, the discharge pipe 11, the suction pipe 12, and the heat exchanger 22 are connected. In order to install the muffler 15 in the pipe 14 from the four-way valve 25 to the stop valve 26, the space for bending 180 degrees was required once for each of the pipes 13. Therefore, in the third embodiment, it is possible to save space as compared with the conventional piping structure in which the muffler 15 is installed in the piping 14 from the four-way valve 25 to the stop valve 26.
According to the third embodiment, the vibration generated when the compressor 23 is driven is most serious because the vibration generated from the suction pipe 12 connected to the accumulator 24 away from the rotation center of the compressor 23 is the most serious problem. Vibration can be damped by providing two U-shaped bends in the pipe of the suction pipe 12 connected to the large accumulator 24 and lengthening the pipe length. As a result, it is possible to reduce the noise equivalent to or higher than that of the conventional one.

(3A) According to the third embodiment of the present invention, the accumulator 24 is connected to the four-way valve 25 in the configuration of the first embodiment (1A) or the second embodiment (2A). The first pipe 11 having a length of the second pipe 12 connected from the four-way valve 25 to the discharge side of the compressor 23 and the first heat comprising the outdoor heat exchanger 22 from the four-way valve 25. The third pipe 13 connected to the exchanger is longer than the pipe connected to the other four-way valve 25 and the fourth pipe connected from the four-way valve 25 to the stop valve 26, and the upper side from the four-way valve 25. Since the second pipe 12 extending in the direction is bent downward, and further bent upward, the second pipe 12 is connected to the compressor 23 via the accumulator 24, so that the pipe configuration can be saved. Kill with, can be a pipe connected to the four-way valve 25 is not able to contact unnecessary and the compressor 23, to provide an air conditioner capable of performing accurately noise control by the vibration of the compressor 23.
That is, in this air conditioner, at least the outdoor heat exchanger 22, the compressor 23 that compresses the refrigerant, and the side part of the compressor 23 are attached to the outdoor unit to perform gas-liquid separation of the refluxed refrigerant. An accumulator 24 and a four-way valve 25 for switching the refrigerant flow path are provided. The four-way valve 25 is disposed on the lower side of the compressor 23, and three pipes extending in the same direction from the four-way valve main body 25 are disposed in a direction extending upward from the four-way valve 25. Further, a muffler 15 is installed in the middle of the piping from the four-way valve 25 to the stop valve 26, and the length of the suction pipe 12 connected from the accumulator 24 to the four-way valve 25 is connected to the other four-way valve 25. The discharge pipe 11, which is a pipe, the pipe 13 from the four-way valve 25 to the heat exchanger 22 and the pipe from the four-way valve 25 to the stop valve 26 and extending upward from the four-way valve 25 are about 180 degrees. It is bent downward by bending, and further bent upward by approximately 180 degrees, and then connected to the compressor 23. Therefore, in this air conditioner, the vibration generated when the compressor 23 is driven is caused mostly by the vibration generated from the suction pipe 12 connected to the accumulator 24 away from the rotation center of the compressor 23. Vibration is attenuated by providing two U-shaped bends in the pipe of the suction pipe 12 connected to the large accumulator 24 and lengthening the pipe. As a result, it is possible to reduce the noise equivalent to or higher than that of the conventional one. Further, although the bending is increased by two places in the suction pipe 12, the number of times of bending is smaller than that of the pipe 14 provided with the conventional muffler 15, so that the space can be saved as compared with the conventional one.

(3B) According to Embodiment 3 of the present invention, in the configuration of the item (3A), the stop valve 26 provided in the fourth pipe 14 is provided, and the space between the four-way valve 25 and the stop valve 26 is provided. Since the muffler 15 is provided in the air conditioning system, the piping configuration can be saved in space, and the piping connected to the four-way valve 25 does not make unnecessary contact with the compressor. Machine can be provided.
That is, in this air conditioner, at least the outdoor heat exchanger 22, the compressor 23 that compresses the refrigerant, and the side part of the compressor 23 are attached to the outdoor unit to perform gas-liquid separation of the refluxed refrigerant. An accumulator 24 and a four-way valve 25 for switching the refrigerant flow path are provided. The four-way valve 25 is disposed on the lower side of the compressor 23, and three pipes extending in the same direction from the four-way valve main body 25 are disposed so as to extend upward from the four-way valve 25. A muffler is installed in the middle of the pipe 26 from the four-way valve 25 to the stop valve. Therefore, in this air conditioner, as shown in the item (1A), the discharge pipe 11, the suction pipe 12, and the pipe from the four-way valve 25 to the heat exchanger 22 need not be bent by 180 degrees, and the four-way valve 25 Even in the piping from the stop valve 26 to the stop valve 26, the bending of 180 degrees can be reduced once compared to the conventional case, so that the effect of space saving is greater.

It is a block diagram which shows the piping structure of the compressor periphery which concerns on the outdoor unit of the air conditioner in Embodiment 1 by this invention. It is a block diagram which shows the piping structure of the compressor periphery which concerns on the outdoor unit of the air conditioner in Embodiment 2 by this invention. It is a block diagram which shows the piping structure of the compressor periphery which concerns on the outdoor unit of the air conditioner in Embodiment 3 by this invention. It is a characteristic curve figure which shows the relationship between the piping length and compressor resonance frequency in embodiment by this invention, and explanatory drawing which shows the bending frequency of piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Discharge pipe, 12 Intake pipe, 13 Piping from four-way valve to heat exchanger, 14 Piping from four-way valve to stop valve, 15 Muffler, 16 Piping connection of four-way valve, 22 Outdoor heat exchanger, 23 Compressor, 24 accumulator, 25 four-way valve, 26 stop valve, 27 metal substrate.

Claims (5)

  A compressor that compresses the refrigerant, a first pipe that forms a refrigerant path to the discharge side of the compressor, a second pipe that forms a refrigerant path that circulates the refrigerant to the compressor via an accumulator, and a first pipe A four-way valve that is connected to a third pipe that forms a refrigerant path to the heat exchanger and a fourth pipe that forms a refrigerant path to the second heat exchanger, and switches the refrigerant path. An air conditioner characterized in that the second pipe, the third pipe, and the fourth pipe extending in the same direction are arranged in a direction extending upward from a four-way valve.   A fixing member for fixing the compressor is provided, and the four-way valve is disposed below the center of the compressor in a predetermined space on the side of the compressor while maintaining a predetermined space. The air conditioner according to claim 1.   The first pipe extending from the four-way valve to the compressor and the second pipe extending from the four-way valve to the accumulator do not have a bend that changes the vertical direction around the side of the compressor. Item 3. An air conditioner according to Item 2.   The air conditioner according to any one of claims 1 to 3, further comprising a stop valve provided in the fourth pipe, and a muffler provided between the four-way valve and the stop valve. . The second pipe extending upward from the four-way valve is bent downward, and further bent upward, and then connected to the compressor via the accumulator. The air conditioner according to claim 1 or claim 2 or claim 4.

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