JP4008981B2 - Refrigerant circuit structure of compression heat transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the refrigerant is circulated in a closed circuit including a compressor, a condenser, an expansion valve, and an evaporator, and air conditioning or freezing is performed by a heat radiation action in the condenser or a heat absorption action in the evaporator. It is related with the refrigerant circuit structure of the compression type heat transfer apparatus comprised in this.
[0002]
[Prior art]
Conventionally, as a compression heat transfer device as described above, for example, a condenser and an evaporator have been provided with indoor and outdoor heat exchangers, and the refrigerant is circulated through a refrigerant circuit including the compressor and the indoor and outdoor heat exchangers. In general, air conditioners (air conditioners) that perform heating and cooling are generally known. Recently, a plurality of indoor heat exchangers are provided in the refrigerant circuit, and each indoor heat exchanger is operated individually. Thus, for example, a so-called multi-type air conditioner that can perform air conditioning on a plurality of rooms with one refrigerant circuit has been proposed.
[0003]
In such an air conditioner, for example, when heating is performed, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor is sent to the indoor heat exchanger, where condensation heat is released. The room is heated. The refrigerant liquefied by releasing the condensation heat is depressurized by the expansion valve, and then sent to the outdoor heat exchanger, where it evaporates by absorbing the evaporation heat, and is sucked into the suction side of the compressor. It has become.
[0004]
[Problems to be solved by the invention]
However, in an air conditioner equipped with a plurality of indoor heat exchangers, the heat exchange capacity on the indoor heat exchanger side varies greatly depending on the number of operating indoor heat exchangers, whereas the heat exchange of the outdoor heat exchanger The number of indoor heat exchangers that are in the heating operation and are in operation because the heat exchange capacity is fixedly set so that the capacity can be handled when all the indoor heat exchangers are operated. When there is less, the amount of heat released from the refrigerant in the indoor heat exchanger is smaller than the amount of heat absorbed by the refrigerant in the outdoor heat exchanger, and the refrigerant is not sufficiently condensed in the indoor heat exchanger. The ratio of the gas-phase refrigerant in the gas-liquid mixed refrigerant that passes through the expansion valve increases, and the weight of the refrigerant that passes through the expansion valve decreases. The decrease in the weight of the refrigerant passing through the expansion valve has a problem that the amount of heat dissipated in the indoor heat exchanger is further reduced and the heating capacity is reduced. When the weight of the refrigerant passing through the expansion valve decreases, the refrigerant stays in, for example, an unoperated indoor heat exchanger on the high pressure side from the compressor to the expansion valve, and passes through the operated indoor heat exchanger. There is a problem that the amount of refrigerant to be further reduced and the heating capacity is further reduced.
[0005]
Therefore, in this type of device, a bypass passage is provided to return the refrigerant discharged from the compressor to the passage on the suction side of the compressor without passing through a condenser or an evaporator, depending on the number of operations of the indoor heat exchanger, etc. The refrigerant is returned to the compressor via the bypass passage to adjust the amount of refrigerant circulating to the indoor heat exchanger, thereby preventing the refrigerant from staying by appropriately vaporizing the refrigerant in the indoor heat exchanger. It is conceivable to be done in reality.
[0006]
However, the refrigerant returned to the compressor via the bypass passage (bypass flow) is a high-pressure refrigerant, whereas the refrigerant returned to the compressor via the indoor heat exchanger (main flow) is low-pressure, so that the intake of the compressor If the bypass passage is connected to the side passage (main passage) as it is, the bypass flow collides with the main flow at the merged portion of the bypass flow and the main flow, thereby disturbing the flow, thereby generating noise at the merged portion. There is a problem.
[0007]
The present invention has been made to solve the above problems, and in the compression heat transfer device such as the multi-type air conditioner as described above, the refrigerant discharged from the compressor is condensed as necessary. It is possible to effectively suppress the generation of noise at the confluence of the main flow returning to the compressor and the bypass flow while ensuring an adequate circulation amount of the refrigerant in the refrigerant circuit so that the evaporator can be bypassed. An object of the present invention is to provide a refrigerant circuit structure of a compression heat transfer device that can be used.
[0008]
[Means for Solving the Problems]
  In order to solve the above problems, the refrigerant circuit structure of the compression heat transfer device of the present invention is configured to return the refrigerant discharged from the compressor to the compressor through the condenser, the expansion valve, and the evaporator. Compressive heat transfer apparatus comprising a passage and a bypass passage that branches from the high-pressure side of the main passage and returns a part of the refrigerant discharged from the compressor to the low-pressure side main passage without passing through the condenser or the like In this main passageA bulging portion that bulges laterally is formed on the inner wall of the main passage, and the tip portion of the bypass passage intervenes in the bulging portion.alongAnd the end of the bypass passage is closed, and the side of the tip portion of the bypass passageMultiple communication holes that communicate with the inside of this passageKeta(Claim 1).
[0009]
According to this structure, the refrigerant in the bypass passage is multiple-reflected by the hollow portion, and thereby, the energy of the pressure wave of the refrigerant is exhausted through the communication hole while being consumed. Therefore, the flow velocity of the bypass flow at the time of merging is suppressed. In addition, the energy of the pressure wave of the refrigerant after jetting is generated by the large number of minute vortices generated when the refrigerant is jetted into the main passage through the communication holes and interfering with each other to cancel each other. Is further consumed. Therefore, by each of these actions, the bypass flow and the main flow are merged without disturbing the main flow, and generation of noise due to collision of both flows at the merge portion is effectively suppressed.
[0012]
  The refrigerant circuit structure of the compression heat transfer device according to the present invention includes a main passage configured to return the refrigerant discharged from the compressor to the compressor via the condenser, the expansion valve, and the evaporator, and the main passage. The main passage includes a bypass passage that branches from the high-pressure side and returns a part of the refrigerant discharged from the compressor to the main passage on the low-pressure side without passing through the condenser or the like. Extends along this passage at the junction of the bypass passageAfter forming multiple hollow parts, the internal and external hollow parts communicate with each other through a plurality of internal communication holes, and the refrigerant sequentially passes through each hollow part., CommunicatingThe refrigerant passing through the bypass passage is introduced into the hollow portion so as to be introduced into the main passage through the through hole.Is(Claims2).
  According to this structure,Since the refrigerant in the bypass passage is jetted into the main passage while being sequentially subjected to multiple reflections in each hollow portion, the energy of the pressure wave of the refrigerant can be effectively consumed. Therefore, it becomes possible to more effectively suppress the flow rate of the refrigerant at the time of merging.
[0013]
  In this case, the front end portion of the bypass passage is inserted into a single hollow portion, and the front end is closed to form a multiple hollow portion, and a plurality of holes are formed on the side surface of the bypass passage as the internal communication hole. If provided (claims)3), Claim2The refrigerant circuit can be manufactured relatively easily.
[0014]
  The refrigerant circuit structure of the compression heat transfer device according to the present invention includes a main passage configured to return the refrigerant discharged from the compressor to the compressor via the condenser, the expansion valve, and the evaporator, and the main passage. A part of the refrigerant that branches off from the high pressure side and is discharged from the compressor,In a compression heat transfer apparatus comprising a bypass passage that returns to the low-pressure side main passage without passing through the condenser or the like, the bypass passage is interposed inside the main passage to close the tip, and the bypass passage A plurality of holes for ejecting the refrigerant in the bypass passage in a direction parallel to the flow direction of the refrigerant in the main passage is formed in the intervention portion of4).
[0015]
According to this structure, the refrigerant in the bypass passage is multiple-reflected in the hollow portion, and thus the pressure wave energy of the refrigerant is exhausted while being discharged into the passage through the communication hole. Is effectively suppressed. Moreover, since the refrigerant in the bypass passage is ejected in parallel with the refrigerant flow direction in the main passage, it is difficult to disturb the main flow when the refrigerant is ejected from the bypass passage. Therefore, by each of these actions, the bypass flow and the main flow can be merged without disturbing the main flow.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a circuit diagram showing an air conditioner using a compression heat transfer device according to the present invention. In this figure, only the main part of the air conditioner is displayed. In the following description, the term “passage” means a pipe.
[0018]
An air conditioner 1 (hereinafter abbreviated as an air conditioner 1) shown in this figure includes a compressor 2 driven by an engine (not shown), and a refrigerant that circulates refrigerant such as CFC compressed and discharged by the compressor 2. Circuit 3.
[0019]
The refrigerant circuit 3 includes a condenser, an expansion valve, and an evaporator, and circulates the refrigerant discharged from the compressor 2 so as to return to the compressor 2 through the condenser, the expansion valve, and the evaporator. A closed circuit is configured.
[0020]
In the present embodiment, a plurality of indoor heat exchangers 10, an expansion valve 11 attached thereto, and an outdoor heat exchanger 12 are incorporated in the refrigerant circuit 3, and a four-way valve 5 that switches the refrigerant circulation direction is provided. Thus, during heating, the indoor heat exchanger 10 serves as a condenser and the outdoor heat exchanger 12 serves as an evaporator, and during cooling, the indoor heat exchanger 10 serves as an evaporator and the outdoor heat exchanger 12 serves as a condenser. It is configured.
[0021]
More specifically, a passage 4 a is led out from the discharge side of the compressor 2, and this is connected to the first port 5 a of the four-way valve 5. In the four-way valve 5, a passage 4 b is led out from the fourth port 5 d, and this passage 4 b is introduced to the suction side of the compressor 2 through the accumulator 6.
[0022]
Between the passages 4a and 4b, there is provided a first bypass passage 7 which is branched from the middle and connected to the passage 4b on the upstream side of the accumulator 6. The first bypass passage 7 is provided with a first bypass for flow rate adjustment. A valve 8 is connected.
[0023]
In the four-way valve 5, a passage 4 c is led out from the second port 5 b, and the passage 4 c reaches each indoor heat exchanger 10.
[0024]
As shown in the figure, the indoor heat exchangers 10 are arranged in parallel to each other, and the input / output portions on one side (left side in the figure) are connected to the passage 4c, and the other side (in the figure) The right and left input / output portions are each connected to the passage 4d via the expansion valve 11. The passage 4 d is connected to the third port 5 c of the four-way valve 5 through the outdoor heat exchanger 12.
[0025]
A second bypass passage 13 branched from the passage 4d is provided on the upstream side of the outdoor heat exchanger 12 in the passage 4d. The bypass passage 13 is connected to the passage 4b, and the second bypass passage 13 is connected to the passage 4d. A second bypass valve 14 for adjusting the flow rate is connected to the main body.
[0026]
Incidentally, in the refrigerant circuit 3, as a feature point of the present application, a connecting portion (portion indicated by a symbol T in the drawing) between the first bypass passage 7 and the passage 4b has a structure as shown in FIG.
[0027]
That is, in this portion, the tip of the first bypass passage 7 is intervened in the passage 4b as shown in the figure, and the intervention portion of the first bypass passage 7 is in the refrigerant flow direction (the direction of the arrow in the figure). It is bent toward the downstream side and arranged along the inner surface of the passage 4b.
[0028]
And while the front-end | tip of the said 1st bypass passage 7 is obstruct | occluded, as shown to the side surface of the part intervened by the path | route 4b among the said intervention parts of the 1st bypass passage 7, as shown in the figure, a 1st bypass passage 7 is formed, and the refrigerant in the first bypass passage 7 is introduced into the passage 4b through the communication holes 16.
[0029]
Next, the effect of the air conditioning apparatus 1 as described above will be described.
[0030]
When heating operation is performed in the air conditioner 1, the compressor 2 is operated in accordance with engine driving, and high-temperature and high-pressure gaseous refrigerant is discharged into the passage 4 a and sent to the first port 5 a of the four-way valve 5. It is done. At this time, when all the indoor heat exchangers 10 are operated, both the first and second bypass valves 8 and 14 are fully closed. The case where some of the indoor heat exchangers 10 are operated will be described in detail later.
[0031]
The four-way valve 5 is in a state where the first port 5a and the second port 5b communicate with each other and the third port 5c and the fourth port 5d communicate with each other at the time of heating. The refrigerant discharged from the compressor 2 into the passage 4a is sent to the passage 4c through the four-way valve 5. And it reaches each indoor heat exchanger 10, and discharge | releases condensation heat here and liquefies. That is, indoor heating is performed by the condensation heat released in each indoor heat exchanger 10 at this time.
[0032]
The refrigerant liquefied by releasing the condensation heat is decompressed by the expansion valve 11 and then sent to the passage 4d to reach the outdoor heat exchanger 38a, where it evaporates by absorbing the heat of evaporation from the outside air. Sent to valve 5.
[0033]
In the four-way valve 5, since the third port 5c and the fourth port 5d communicate with each other as described above, the refrigerant reaches the accumulator 6 through the four-way valve 5 and the passage 4b, where the gas component and the liquid component are separated. After the separation, only the gaseous refrigerant is sent to the compressor 2 through the passage 4b. Thus, thereafter, similarly, the refrigerant is circulated in the refrigerant circuit 3 to perform the heating operation.
[0034]
  On the other hand, during the cooling operation, the first port 5a and the third port 5c of the four-way valve 33 in the refrigerant circuit 3 are communicated with the second port 5b and the fourth port 5d, respectively. Therefore, the compressorTwoThe refrigerant discharged from the refrigerant first passes through the passage 4a, the four-way valve 5, and the passage 4d to reach the outdoor heat exchanger 12, where it is cooled and condensed by the outside air to be sent to each expansion valve 11 as a high-pressure liquid refrigerant. .
[0035]
The refrigerant sent to each expansion valve 11 is depressurized here and sent to each indoor heat exchanger 10, where it evaporates (vaporizes) by absorbing latent heat of evaporation from the indoor air. That is, the refrigerant cools the room by absorbing the latent heat of vaporization in the room.
[0036]
  The vaporized refrigerant passes through the passage 4c, the four-way valve 5 and the passage 4b to reach the accumulator 6, where the refrigerant is separated into gas and liquid, and then only the gaseous refrigerant is sent to the compressor 2. . Thus, hereinafter, similarly, the refrigerant circuit3The cooling operation is performed by circulating the refrigerant.
[0037]
By the way, in said air conditioner 1, when it is at the time of heating operation and some indoor heat exchangers 10 are operated among the indoor heat exchangers 10, the first bypass valve 8 is opened. A part of the refrigerant flowing through the passage 4a is introduced into the passage 4b via the first bypass passage 7, whereby a part of the refrigerant discharged from the compressor 2 is introduced into the indoor heat exchanger 10, the outdoor heat exchanger 12, and the like. It returns to the compressor 2 without passing through. Further, the second bypass valve 14 is opened and a part of the passage 4d is introduced into the passage 4b via the second bypass passage 13, whereby a part of the refrigerant after releasing the condensation heat is used as the outdoor heat exchanger 12. It returns to the compressor 2 via the channel | path 4b, without passing. At this time, for example, the opening degree of the first and second bypass valves 8 and 14 is adjusted according to the number of operations of the indoor heat exchanger 10.
[0038]
That is, when only some of the indoor heat exchangers 10 are operated during the heating operation, the fans are stopped for the other indoor heat exchangers, and the expansion valve 11 is fully closed, the indoor heat exchange is performed. In many cases, the amount of heat dissipated in the cooler 10 becomes smaller than the amount of heat absorbed in the outdoor heat exchanger 12 and the heat transfer balance of the refrigerant is lost. When the balance is lost, the proportion of the gas-phase refrigerant in the gas-liquid mixed refrigerant passing through the expansion valve 11 connected to the operated indoor heat exchanger 10 increases, and the weight of the refrigerant passing through the expansion valve 11 decreases. Therefore, the refrigerant passing through the indoor heat exchanger 10 to be operated is also reduced, and the heating capacity is reduced. Therefore, in such an operating state, as described above, a part of the refrigerant flowing through the passage 4a is returned to the compressor 2 through the first bypass passage 7, and thereby an appropriate amount corresponding to the number of operating indoor heat exchangers 10 is obtained. The refrigerant is sent to the indoor heat exchanger 10. As a result, the high-pressure side refrigerant is bypassed from the expansion valve 11 to the compressor 2 via the outdoor heat exchanger 12 to increase the low-pressure side refrigerant temperature. As a result, the amount of heat absorbed by the outdoor heat exchanger 12 is reduced, the refrigerant flowing from the compressor 2 to the operating indoor heat exchanger 10 is radiated and liquefied, and the amount of refrigerant passing through the expansion valve 11 is increased. That is, the amount of refrigerant flowing in the indoor heat exchanger 10 that is in operation increases, and the heating capacity is improved.
[0039]
However, when the number of operating indoor heat exchangers 10 is particularly small, the heat dissipation capacity decreases, whereas the heat absorption capacity by the outdoor heat exchanger 12 remains large. By adjusting the refrigerant passage amount, the heat dissipating ability in the indoor heat exchanger 10 that is operated due to the temperature drop accompanying the pressure drop on the high pressure side is reduced, and the pressure difference before and after the expansion valve 11 is reduced. The refrigerant weight passing through 11 decreases on the contrary, and as a result, the amount of refrigerant passing through the indoor heat exchanger 10 being operated decreases, the improvement of the heating capacity reaches the limit, and conversely decreases. And there exists a possibility that the compressor 2 may be overheated by the temperature rise by the side of the low voltage | pressure by bypass. Therefore, when returning a part of the refrigerant to the compressor 2 through the first bypass passage 7 as described above, the relatively low temperature refrigerant after releasing the condensation heat in the indoor heat exchanger 10 is used as the outdoor heat. By returning to the compressor 2 through the second bypass passage 13 without passing through the exchanger 12, the temperature of the refrigerant sucked into the compressor 2 is lowered, thereby maintaining an unbalance of the heat exchange of the refrigerant. ing.
[0040]
By the way, when the refrigerant is bypassed through the first bypass passage 7 as described above, the high-pressure refrigerant discharged from the compressor 2 is decompressed by the relatively low-pressure refrigerant in the passage 4b, that is, the expansion valve 11. Therefore, the refrigerant (bypass flow) in the first bypass passage 7 collides with the refrigerant (main flow) in the passage 4b and disturbs the main flow, thereby causing noise in the merge portion. There is a concern to make it happen.
[0041]
However, in the refrigerant circuit 3 of the air conditioner 1, the first bypass passage 7 whose tip is closed as described above is interposed in the passage 4 b, and the passage is made through the communication hole 16 formed on the side surface of the first bypass passage 7. Since the bypass flow is introduced into 4b, the generation of noise as described above can be effectively suppressed.
[0042]
That is, since the tip of the first bypass passage 7 is closed, the refrigerant in the first bypass passage 7 that reaches the joining portion with the passage 4b is reflected through the communication hole 16 while being multiple-reflected inside. Are ejected into the passage 4b. At this time, the refrigerant is multiple-reflected in the first bypass passage 7 so that the energy of the pressure wave of the refrigerant is remarkably consumed, and as a result, the flow velocity of the refrigerant at the time of merging, that is, the ejection from the communication hole 16 is effective. (The flow rate is reduced). Therefore, there is no case where the bypass flow violently collides with the main flow to disturb the main flow.
[0043]
In addition, when the refrigerant is ejected into the passage 4b through the plurality of communication holes 16, a large number of micro vortices generated upon ejection interfere with the vortex of the refrigerant flowing through the passage 4b and cancel each other out (vortex flow). Interference). Therefore, the pressure wave energy of the refrigerant after ejection is further consumed, and as a result, mainstream turbulence due to collision between the bypass flow and the mainstream is further suppressed.
[0044]
Accordingly, by bypassing the high-pressure refrigerant through the first bypass passage 7 and introducing it into the passage 4b, the effects of both the above-described flow velocity reducing action and vortex interference action are exerted. Thus, the bypass flow and the main flow are merged without disturbing the main flow, and the generation of noise due to the collision of both flows at the merge portion is effectively suppressed.
[0045]
FIG. 3 shows a case where the structure of the above-described embodiment is adopted as the structure of the connection portion between the first bypass passage 7 and the passage 4b, and a general connection structure in this type of conventional refrigerant circuit, for example, simply the first bypass. By connecting the tip of the passage 7 to the side wall of the passage 4b, the noise is detected for each specific frequency when both passages are communicated in a substantially T shape (in the figure, the broken lines indicate the above-mentioned data). Data according to the structure of the embodiment is shown, and a solid line indicates data according to the conventional structure). Also from this data, according to the structure of the above embodiment, noise is generated compared to the conventional general connection structure, specifically, noise in a frequency range exceeding 1.6 K (Hz) in the audible frequency range. It can be considered that the occurrence of is effectively suppressed.
[0046]
Note that the above data is a structure in which the first bypass passage 7 of φ5 (mm) is interposed in the passage 4b of φ17 (mm), and the refrigerant flows in the passage 4b at a pressure of about 0.5 MPa (main flow). On the other hand, it is data when a refrigerant (bypass flow) having a pressure of about 2 Mpa is joined via the first bypass passage 7.
[0047]
As described above, according to the air conditioner 1, when some of the indoor heat exchangers 10 are operated, a part of the refrigerant discharged from the compressor 2 is compressed through the first bypass passage 7. While returning to the machine 2 to avoid stagnation of the refrigerant in the refrigerant circuit, it is possible to effectively suppress the generation of noise at the junction of the first bypass passage 7 and the passage 4b. Therefore, it is possible to provide a quieter air conditioner than this type of conventional air conditioner.
[0048]
By the way, the connection structure of the first bypass passage 7 and the passage 4b is an embodiment of the refrigerant circuit structure of the present invention, and the specific structure thereof is within a range not departing from the gist of the present invention. It can be changed as appropriate.
[0049]
For example, FIGS. 4A to 4G and FIGS. 5A to 5C show other embodiments of the connection structure, respectively, and these structures may be adopted.
[0050]
First, FIG. 4A is a structure in which the first bypass passage 7 intervened in the passage 4b in the structure shown in FIG. 2 is appropriately inclined with respect to the passage 4b.
[0051]
In FIG. 4B, the front end portion of the first bypass passage 7 has a branch structure, and the branch passages 7a and 7b are interposed in the passage 4b, and are arranged side by side in the refrigerant flow direction along the inner surface of the passage 4b. This is the structure. In this case, the tip of the first bypass passage 7 may be branched into three or more. Further, as shown in the figure, the branch passages 7a and 7b may be arranged in the circumferential direction of the passage 4b in addition to the refrigerant flow direction.
[0052]
FIG. 4C is a structure in which a silencer is provided in the first bypass passage 7 in the structure shown in FIG. Specifically, a portion slightly upstream of the portion of the first bypass passage 7 that is interposed in the passage 4b is disposed in the sealed chamber 21, and a large number of communication holes 20 are formed in this portion. According to this structure, the energy of the pressure wave of the refrigerant flowing in the first bypass passage 7 is consumed by the resonance of the pressure wave until the refrigerant reaches the front end portion of the first bypass passage 7. Is effective more effectively.
[0053]
FIG. 4D shows a structure in which a bulging portion 18 that bulges laterally is formed inside the passage 4 b, and the tip portion of the first bypass passage 7 is disposed in the bulging portion 18. According to such a structure, the bypass flow and the main flow can be merged more effectively without disturbing the main flow.
[0054]
4 (e) shows a structure in which the diameter of the tip portion of the first bypass passage 7 intervening in the passage 4b is gradually increased toward the downstream side in the refrigerant flow direction. FIG. 4 (f) shows the tip portion. The diameter is gradually reduced toward the downstream side in the refrigerant flow direction.
[0055]
FIG. 4G shows a shape in which the tip portion of the first bypass passage 7 extends in a direction substantially perpendicular to the refrigerant flow direction inside the passage 4b and is bent into a U shape. In this structure, the communication holes 16 are formed so that the refrigerant is jetted in a direction parallel to the flow direction of the refrigerant in the passage 4b.
[0056]
In FIG. 5A, a hollow portion 22 that communicates with the passage 4b through a large number of communication holes 24 formed in the partition wall 23 is provided integrally on the side of the passage 4b, and a first bypass is provided in the hollow portion 22. A bypass flow by the passage 7 is introduced. In this structure, the tip of the first bypass passage 7 is simply connected to the side wall that forms the hollow portion 22. Even with this structure, the refrigerant introduced into the hollow portion 22 from the first bypass passage 7 is jetted into the passage 4b through the communication hole 24 while being subjected to multiple reflections inside the hollow portion 22, so that FIG. Similar to the structure shown, the effect of reducing the flow velocity and interfering with the vortex flow are exhibited. Therefore, the bypass flow and the main flow can be merged without disturbing the main flow. In the case of this structure, as shown in FIG. 5B, in addition to forming the hollow portion 22 in a part of the circumferential direction of the passage 4b, as shown in FIG. The hollow portion 22 may be formed.
[0057]
FIG. 5C is a combination of the structure shown in FIG. 2 and the structure shown in FIG. That is, the tip portion of the first bypass passage 7 is intervened in the hollow portion 22 and the communication hole 16 is formed in the intervention portion. According to this structure, first, the flow rate reducing action is exhibited in the first bypass passage 7, and further, the flow rate reducing action is exhibited in the hollow portion 22. That is, the effect of reducing the flow rate is exhibited twice. Therefore, it becomes possible to merge the bypass flow and the main flow more effectively without disturbing the main flow.
[0058]
Although not shown, as a modification of FIG. 5C, for example, a hollow portion is further formed on the outer side of the hollow portion 22 via a side wall, and these interiors are communicated with each other via a communication hole. A double hollow portion may be formed, and the bypass flow by the first bypass passage 7 may be introduced into the outermost hollow portion. Even with such a structure, the effect of reducing the flow velocity is doubled as in the structure of FIG. In this case, for example, when the pressure difference between the bypass flow and the main flow is large, the hollow portion may be formed in triplicate or multiple layers so that the effect of reducing the flow velocity can be exhibited more effectively.
[0059]
In the description of the above embodiment, the shape of the communication hole 16 formed in the first bypass passage 7 is not particularly mentioned, but the communication hole 16 is any one of a circle, an ellipse, and a slit. Also good. The communication hole 16 may have a hole diameter that changes in the hole axis direction, such as a tapered shape or a stepped shape, in addition to a hole diameter that is constant in the hole axis direction. Furthermore, in addition to forming the communication holes 16 having the same shape, the communication holes 16 having different shapes may be mixed. In short, the communication hole 16 may be formed so as to effectively suppress the disturbance of the refrigerant flow at the joining portion. In addition, in the 1st bypass passage 7, the part which forms the communicating hole 16 may be covered with porous members, such as a metal net, and this may suppress the flow velocity of the bypass flow at the time of merge.
[0060]
In addition, although the said embodiment demonstrated the air conditioner 1 as an example as a compression-type heat transfer apparatus, of course, application of this application is not restricted to the air conditioner 1, Compared with the heat absorption amount in an evaporator, it is a condenser. For example, it can be applied to other compression heat transfer devices such as refrigerators.
[0061]
【The invention's effect】
  As described above, the present invention provides the main passage for circulating the refrigerant and a part of the refrigerant discharged from the compressor.,In a compression heat transfer apparatus having a bypass passage for returning to the main passage on the low pressure side without passing through a condenser or the like,A bulging portion that bulges laterally is formed on the inner wall of the inner wall, and a tip portion of the bypass passage is interposed in the bulging portion and provided along the main passage. A plurality of communication holes for communicating the passage and the inside of the main passage are provided on the side surface of the tip portion.By,coldSince the medium is jetted into the main passage through the communication hole while being subjected to multiple reflections, the bypass flow and the main flow can be effectively merged without disturbing the main flow. Therefore, it is possible to effectively suppress the generation of noise due to the collision of both flows at the joining portion.
[0063]
  Also,The present invention relates to a compression heat transfer device having a main passage for circulating a refrigerant and a bypass passage for returning a part of the refrigerant discharged from the compressor to the main passage on the low pressure side without passing through a condenser or the like.InIt extends along the main passage at the junction of the main passage and the bypass passage.After forming multiple hollow parts, the internal and external hollow parts communicate with each other through a plurality of internal communication holes, and the refrigerant sequentially passes through each hollow part., CommunicatingThe refrigerant passing through the bypass passage is introduced into the hollow portion so as to be introduced into the passage through the through hole.SoRefrigerant in bypass passageTheSequentially multiple reflections in each hollowSenaErupted in the main passageLet thisThe energy of the pressure wave of the refrigerant can be effectively consumed. Therefore, it becomes possible to more effectively suppress the flow rate of the refrigerant at the time of merging. In this case, the front end portion of the bypass passage is inserted into a single hollow portion, and the front end is closed to form a multiple hollow portion, and a plurality of holes are formed on the side surface of the bypass passage as the internal communication hole. If provided, the refrigerant circuit as described above can be manufactured relatively easily.
[0064]
The present invention also provides a main passage configured to return the refrigerant discharged from the compressor to the compressor through the condenser, the expansion valve and the evaporator, and a part of the refrigerant discharged from the compressor to the condenser. In a compression heat transfer device having a bypass passage for returning to the main passage on the suction side of the compressor without passing through the above, the bypass passage is interposed inside the main passage to close the tip, and the bypass A plurality of holes for ejecting the refrigerant in the bypass passage in a direction parallel to the flow direction of the refrigerant in the main passage are formed in the intervention portion of the passage, and thereby, the refrigerant in the main passage is reflected in the hollow portion while being multi-reflected. Since the refrigerant is ejected in a direction parallel to the flow, the bypass flow and the main flow can be effectively merged without disturbing the main flow. Therefore, it is possible to effectively suppress the generation of noise due to the collision of both flows at the joining portion.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram of an air conditioner to which the present invention is applied.
FIG. 2 is a schematic cross-sectional view showing a structure of a connection portion between a bypass passage and a main passage (passage structure of a joining portion of a bypass flow and a main flow).
FIG. 3 is a diagram (graph) showing the detection result of the noise level by the conventional connection structure and the connection structure of the present application.
FIGS. 4A to 4G are schematic cross-sectional views showing other structures of the connecting portion between the bypass passage and the main passage.
FIGS. 5A to 5C are schematic cross-sectional views showing other structures of the connecting portion between the bypass passage and the main passage.
[Explanation of symbols]
1 Air conditioner (air conditioner)
2 Compressor
3 Refrigerant circuit
4a-4d passage
5 Four-way valve
5a 1st port
5b Second port
5c 3rd port
5d 4th port
6 Accumulator
7 First bypass passage
8 First bypass valve
10 Indoor heat exchanger
11 Expansion valve
12 Outdoor heat exchanger
13 Second bypass passage
14 Second bypass valve
16 communication hole

Claims (4)

A main passage configured to return the refrigerant discharged from the compressor to the compressor through the condenser, the expansion valve, and the evaporator, and one of the refrigerant branched from the high-pressure side of the main passage and discharged from the compressor. the parts, in compression heat transfer device that includes a bypass passage for returning to the path of the low-pressure side without passing through the condenser or the like,
A bulging portion that bulges laterally is formed on the inner wall of the main passage , and a tip portion of the bypass passage is interposed in the bulging portion and provided along the main passage, and the tip is closed. a side surface of the distal portion of the bypass passage, refrigerant circuit structure of the compression type heat transfer device, characterized in that a plurality of communication holes for communicating the said passage and the passage digits set. A main passage configured to return the refrigerant discharged from the compressor to the compressor through the condenser, the expansion valve, and the evaporator, and one of the refrigerant branched from the high-pressure side of the main passage and discharged from the compressor. In a compression heat transfer device comprising a bypass passage for returning the part to the main passage on the low pressure side without passing through the condenser or the like,
A plurality of hollow portions extending along the main passage are formed at the confluence connection portion of the main passage and the bypass passage, and the inner and outer hollow portions are communicated with each other through a plurality of internal communication holes so that the refrigerant is sequentially hollowed out. after a part of compression type heat transfer device the refrigerant characterized in that so as to introduce with respect to the hollow portion through the bypass passage to be introduced into the present passage through a communicating hole Refrigerant circuit structure. A double hollow portion is formed by interposing the tip portion of the bypass passage in a single hollow portion and closing the tip, and a plurality of holes are provided on the side surface of the bypass passage as the internal communication hole . The refrigerant circuit structure of the compression heat transfer device according to claim 2. A main passage configured to return the refrigerant discharged from the compressor to the compressor through the condenser, the expansion valve, and the evaporator, and one of the refrigerant branched from the high-pressure side of the main passage and discharged from the compressor. In a compression heat transfer device having a bypass passage for returning the part to the main passage on the low pressure side without passing through the condenser or the like, the bypass passage is interposed inside the main passage and the tip is closed. , to the intervention portion of the bypass passage, refrigerant circuit of compression type heat transfer device characterized by forming a plurality of holes for ejecting the refrigerant in a direction parallel to the flow direction of the refrigerant in the passage in the bypass passage Construction.

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