JP6858268B2 - Heat exchanger assembly and air conditioner indoor unit - Google Patents

Description

The present application relates to the technical field of air conditioner products, and particularly to heat exchanger assemblies and air conditioner indoor units.

With the continuous progress of air conditioner energy efficiency at home and abroad, how to improve the heat exchange efficiency of air conditioner heat exchangers has become an urgent issue to be solved. Among the many solutions, use heat exchangers with high heat exchanger efficiency among newly designed air conditioners, or heat exchange heat exchangers with relatively low heat exchange efficiency of already mass-produced air conditioners. Replacing with a more efficient heat exchanger is a relatively effective approach.

In exemplary techniques, air conditioner heat exchangers with relatively good heat exchange performance are typically in a semi-enclosed arrangement that includes a front heat exchanger, an intermediate heat exchanger, and a rear heat exchanger. When the air conditioner heat exchanger is in the cooling operating condition, the refrigerant is divided into three by a 3-way tube and enters the front heat exchanger, the intermediate heat exchanger and the rear heat exchanger, respectively, to exchange heat. However, since the front heat exchanger, the intermediate heat exchanger, and the rear heat exchanger are restricted to the rectangular space in the casing of the air conditioner equipment, their respective dimensions are also different from each other. As a result, there is a certain difference in the number of heat exchange tubes that can be installed in each heat exchanger. In many cases, the dimensions of the intermediate heat exchanger are twice or more than the front or rear heat exchanger. As such, the number of heat exchangers installed in the intermediate heat exchanger is also much larger than that of the front heat exchanger or the rear heat exchanger. In this way, the number of heat exchanger tubes that pass after the refrigerant enters the front heat exchanger or the rear heat exchanger and before it flows out of the air conditioner heat exchanger is the number of heat exchanger tubes that the refrigerant passes through when it enters the intermediate heat exchanger. Much less than the number of. In other words, when the refrigerant exchanges heat in the front heat exchanger or the rear heat exchanger, it is highly possible that the refrigerant is discharged from the indoor heat exchanger without sufficient heat exchange. In the case of heat exchange in the intermediate heat exchanger, there is a high possibility that the heat will continue to flow through the heat exchange tube even if the heat exchange has already been sufficiently performed. In short, that is, this kind of flow path design causes an imbalance in the heat exchange of the air conditioner heat exchanger and reduces the energy efficiency of the air conditioner heat exchanger.

The main purpose of the present application is to improve the heat exchange balance between the intermediate heat exchanger and the front heat exchanger and the rear heat exchanger of the air conditioner heat exchanger in the exemplary technical proposal, and to improve the energy efficiency of the air conditioner heat exchanger. To propose a heat exchanger assembly.

In order to achieve the above objectives, the heat exchanger assembly proposed by the present application is:
A main heat exchanger installed in a semi-enclosed shape, including a front heat exchanger, an intermediate heat exchanger and a rear heat exchanger, the front heat exchanger, the intermediate heat exchanger and the rear heat exchange. At least two rows of heat exchangers are installed in each in the intake direction, and the number of heat exchangers of the intermediate heat exchanger is larger than that of the front heat exchanger and the rear heat exchanger.
Including the back tube heat exchanger mounted on the windward side of the main heat exchanger.
When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first crossroad, a second crossroad and a third crossroad after passing through the back tube heat exchanger, and the first crossroads. , The second crossroads and the third crossroads both flow from the heat exchange pipe on the wind side of the main heat exchanger toward the heat exchange pipe on the leeward side, and the first crossroads pass through the heat exchange pipe of the front heat exchanger. Flow, the second crossroads flow through the heat exchange tubes of the intermediate heat exchanger, the third crossroads flow through the heat exchange tubes of the rear heat exchanger, and at least one of the first and third crossroads is said. It is installed across the heat exchange tube of the intermediate heat exchanger.

Preferably, the difference between the two of the number of heat exchange tubes through which the first crossroads, the second crossroads and the third crossroads flow is less than or equal to three.

Preferably, the front heat exchanger, the intermediate heat exchanger and the rear heat exchanger are all provided with two rows of heat exchange tubes, and the total number of heat exchange tubes of the main heat exchanger is 18 to 22.

Preferably, the third crossroads flow through all the heat exchange tubes of the rear heat exchanger, the second crossroads flow through some heat exchange tubes of the intermediate heat exchanger, and the first crossroads flow through the intermediate heat. It flows through the remaining heat exchanger tubes of the exchanger and all heat exchanger tubes of the front heat exchanger.

Preferably, the heat exchange tube of the front heat exchanger includes a first outer row and a first inner row, and the heat exchange tube of the intermediate heat exchanger includes a second outer row and a second inner row, said first. The outer row and the second outer row are located on the wind side of the main heat exchanger,
When the heat exchanger assembly cools, the first crossroads flow from the second outer row, flow along the second outer row, enter the first outer row via the first jumper pipe, and enter the first outer row. The entire outer row and first inner row flow in sequence and flow out of the first inner row; the second crossroads flow in from the second outer row, the rest of the second outer row, and the second inner row. It flows through the entire row and out of the second inner row.

Preferably, the first crossroads flow from the heat exchange pipe in the middle of the second outer row, then along the second outer row toward the front heat exchanger side, and further through the first jumper pipe. Enters the heat exchange tube close to the intermediate heat exchanger in the first outer row, flows through the entire first outer row and the first inner row in order, and further heats closer to the intermediate heat exchanger in the first inner row. It flows out of the exchange tube.

Preferably, the second crossroads flow from a heat exchange pipe adjacent to the heat exchange pipe into which the first crossroads on the second outer row flow, and flow toward the rear heat exchanger side along the second outer row. Then, it flows from the second outer row into the heat exchange pipe near the rear heat exchanger in the second inner row, flows toward the front heat exchanger side along the second inner row, and further flows toward the front heat exchanger side, and further, the second. It flows out of a heat exchange tube near the front heat exchanger in the inner row.

Preferably, the rear heat exchanger includes a third inner row and a third outer row, the third outer row located on the windward side of the main heat exchanger.
The third crossroads flow from a heat exchange tube near the intermediate heat exchanger in the third outer row, then flow through the entire third outer row and third inner row in order, and further flow through the third inner row. It flows out of the heat exchange tube near the intermediate heat exchanger.

Preferably, the heat exchange tubes of the front heat exchanger include a first outer row and a first inner row, and the heat exchange tubes in the intermediate heat exchanger include a second outer row and a second inner row, said rearward. The heat exchanger tubes of the heat exchanger include a third outer row and a third inner row; the first outer row, the second outer row and the third outer row are all close to the wind side of the main heat exchanger. Installed,
When the heat exchanger assembly is cooled, the first crossroads flow from the first outer row, flow through the entire first outer row and the first inner row in order, and further pass through the first jumper pipe to the first. Entering the second inner row and flowing out of the second inner row, the second crossroads flow in from the second outer row, flow through the entire second outer row and the rest of the second inner row in order, and Flowing out from the second inner row, the third crossroads flow in from the third outer row, flow through the entire third outer row and the third inner row in order, and flow out from the third inner row.

Preferably, the first crossroads enter through a heat exchange tube near the intermediate heat exchanger in the first outer row, flow through the entire first outer row and first inner row in sequence, and of the first inner row. It reaches the heat exchange tube close to the intermediate heat exchanger, and further enters the second inner row via the first jumper tube.

Preferably, the heat exchange tubes of the front heat exchanger include a first outer row and a first inner row, and the heat exchange tubes of the intermediate heat exchanger include a second outer row and a second inner row, the rear heat. The heat exchanger tubes of the exchanger include a third outer row and a third inner row; the first outer row, the second outer row and the third outer row are all installed close to the wind side of the main heat exchanger. Being done
When the heat exchanger assembly cools, the first crossroads flow from the second outer row, flow along the second outer row and enter the first outer row via the first jumper tube, and said. It flows through the entire first outer row and the first inner row in order, then enters the second inner row through the second jumper pipe, flows out from the second inner row, and the second crossroads is from the second outer row. It flows in, flows through the second outer row and the rest of the second inner row in order, and flows out of the second inner row, the third crossroads flow in from the third outer row, and the third outer row and the first. It flows in order with the three inner rows, and flows out from the third inner row.

Preferably, the diameter of the heat exchange tube of the back tube heat exchanger is larger than the tube diameter of the heat exchange tube of the main heat exchanger.

Preferably, the back tube heat exchanger is mounted on the windward side of the intermediate heat exchanger.

Preferably, the back tube heat exchanger is installed closer to the front heat exchanger than the rear heat exchanger.

Preferably, the number of heat exchange tubes of the back tube heat exchanger is 2 to 4.

The present application further proposes a heat exchanger assembly and an air conditioner indoor unit including an equipment casing for accommodating the heat exchanger assembly. The heat exchanger assembly is
A main heat exchanger installed in a semi-enclosed shape, including a front heat exchanger, an intermediate heat exchanger and a rear heat exchanger, the front heat exchanger, the intermediate heat exchanger and the rear heat exchange. At least two rows of heat exchangers are installed in each in the intake direction, and the number of heat exchangers of the intermediate heat exchanger is larger than that of the front heat exchanger and the rear heat exchanger.
Including the back tube heat exchanger mounted on the windward side of the main heat exchanger.
When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first crossroad, a second crossroad and a third crossroad after passing through the back tube heat exchanger, and the first crossroads. , The second crossroads and the third crossroads both flow from the heat exchange pipe on the wind side of the main heat exchanger toward the heat exchange pipe on the leeward side, and the first crossroads pass through the heat exchange pipe of the front heat exchanger. Flow, the second crossroads flow through the heat exchange tubes of the intermediate heat exchanger, the third crossroads flow through the heat exchange tubes of the rear heat exchanger, and at least one of the first and third crossroads is said. It is installed across the heat exchange tube of the intermediate heat exchanger.

Preferably, the width dimension of the equipment casing along the front-rear direction is smaller than 800 mm, and the height dimension of the equipment casing along the vertical direction is smaller than 295 mm.

Preferably, when the heat exchanger assembly is provided in the equipment casing, the angular range between the rear heat exchanger placement direction and the vertical direction is 38 ° to 48 °.

Preferably, when the heat exchanger assembly is provided in the equipment casing, the angular range between the arrangement direction and the vertical direction of the intermediate heat exchanger and the front heat exchanger is 45 ° to 55 °.

Preferably, the close ends of the intermediate heat exchanger and the rear heat exchanger are in contact with each other, or there is a gap between the close ends of the intermediate heat exchanger and the rear heat exchanger. The air conditioner indoor unit further includes a window shield connected across between the wind side of the intermediate heat exchanger and the rear heat exchanger at their adjacent ends.

The heat exchanger assembly of the technical proposal of the present application includes a main heat exchanger and a back tube heat exchanger installed on the wind side of the main heat exchanger, and the main heat exchanger is a front heat exchanger and an intermediate heat exchanger. And rear heat exchangers are included. When the heat exchanger assembly cools, after passing through the back tube heat exchanger, the heat exchange flow path splits into the first crossroads, the second crossroads and the third crossroads, and the first crossroads flows through the front heat exchanger. The second crossroads flow through the intermediate heat exchanger and the third crossroads flow through the rear heat exchangers. One of the first and third crossroads is installed across the heat exchanger pipe of the intermediate heat exchanger, and after improving the flow path in this way, the refrigerant that has passed through the front heat exchanger or the rear heat exchanger heat exchanger pipe , Part of the heat exchanger of the intermediate heat exchanger can be passed continuously, and the first crossroads pass only the heat exchanger pipes of the front heat exchanger or the third crossroads pass only the heat exchanger pipes of the rear heat exchanger. Insufficient heat exchange of refrigerant that can occur by passing through (because there are relatively few heat exchange tubes in the front and rear heat exchangers), and the second crossroads pass only through the heat exchange tubes in the intermediate heat exchangers. While avoiding the problem of structural waste (because there are relatively many heat exchanger tubes in the intermediate heat exchanger), the heat exchange effect between the front heat exchanger and the rear heat exchanger and the intermediate heat exchanger can be avoided. To be more balanced and effectively improve the energy efficiency of the heat exchanger assembly.

In order to more clearly explain the examples of the present application and the technical proposals of the prior art, the accompanying drawings required for the explanation of the examples or the prior art will be briefly introduced below. It is clear that the accompanying drawings in the following description are only a part of the embodiments of the present application, and on the premise that those skilled in the art do not carry out creative labor, other attachments are made by the structure shown in these attached drawings. Drawings can be obtained.
It is a structural schematic diagram of one Example of the air conditioner indoor unit of this application. It is a flow path schematic diagram of the 1st Example of the heat exchanger assembly of this application. It is a flow path schematic diagram of the 2nd Example of the heat exchanger assembly of this application. It is a flow path schematic diagram of the 3rd Example of the heat exchanger assembly of this application.

The realization of the object of the present application, functional features and advantages will be described with reference to the accompanying drawings in combination with the examples.

In the following, the technical proposal in the embodiment of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiment of the present application. It is clear that the examples described are not all of the examples of the present application, but only some of the examples of the present application. Based on the examples in the present application, all other embodiments obtained on the premise that those skilled in the art do not perform creative labor belong to the scope of the present application.

If the embodiment of the present application involves directional instructions (eg, up, down, left, right, front, rear ...), the directional instructions are relative positions between the parts in a particular posture (shown in the accompanying drawings). It should be explained that it is used only to explain relationships, exercise situations, etc., and if the particular posture changes, the direction instruction also changes accordingly.

In addition, when related to the explanation of "first", "second", etc. in the embodiment of the present application, the explanation of "first", "second", etc. is only used for the purpose of explanation. It should not be understood to suggest or imply relative importance, or to imply the number of technical features presented. Thereby, the feature limited to "first" and "second" may include at least one feature, either explicitly or implicitly. In addition, the technical proposals of each embodiment can be combined with each other. However, what can be realized by those skilled in the art is the basis. If the combination of technical proposals is inconsistent or unrealizable, it should be understood that such a combination of technical proposals does not exist and is not within the scope of protection claimed by the present application.

The present application proposes a heat exchanger assembly and an air conditioner indoor unit including the heat exchanger assembly. Of course, in other embodiments, the heat exchanger assembly can also be applied to an integrated air conditioner, an air conditioner outdoor unit, and the like, and the present design is not limited thereto.

With reference to FIG. 1, in this embodiment, the air conditioner indoor unit is a wall-mounted air conditioner indoor unit, and specifically includes an equipment casing 3 and a once-through fan 4 installed in the equipment casing 3. Of course, the heat exchanger assembly 1 is also installed in the equipment casing 3 and is located between the intake port on the equipment casing 3 and the once-through fan 4, so that the air sucked by the through-flow fan 4 exchanges heat. Do. In this embodiment, it is easy to understand that the side facing the user is the front and the side facing the wall is the back after the wall-mounted air conditioner indoor unit is assembled. The wall-mounted air conditioner indoor unit adopts an operation method of upper intake and lower ventilation. That is, the heat exchanger assembly 1 is located above the once-through fan 4. It should be explained that the present design is not limited to this, and in other embodiments, the air conditioner indoor unit can be specifically a floor-standing indoor air conditioner or the like.

With reference to FIGS. 1 to 4, in the embodiment of the present application, the heat exchanger assembly 1 is a main heat exchanger installed so as to surround the once-through fan 4 in a semi-surrounding manner, and is a front heat exchanger 11. , Intermediate heat exchanger 12 and rear heat exchanger 13, the front heat exchanger 11, intermediate heat exchanger 12 and rear heat exchanger 13 are each provided with at least two rows of heat exchanger tubes in the intake direction, and intermediate heat is provided. The number of heat exchangers in the exchanger 12 includes a main heat exchanger larger than the front heat exchanger 11 and the rear heat exchanger 13, and a back tube heat exchanger 14 installed on the wind side of the main heat exchanger.

In this embodiment, the front heat exchanger 11, the intermediate heat exchanger 12, and the rear heat exchanger 13 are all provided with two rows of heat exchange tubes in the intake direction. As a result, not only the number of rows of heat exchange tubes is too small to prevent insufficient heat exchange, but also the waste of the structure due to the installation of too many heat exchange tubes is prevented. Of course, in other embodiments, three rows, and thus four rows, of heat exchange tubes can be installed in the intake direction to meet the different heat exchange demands of each heat exchanger. This design is not limited to this. Specifically, the heat exchange pipe of the front heat exchanger 11 includes the first outer row 111 and the first inner row 112, and the heat exchange pipe of the intermediate heat exchanger 12 includes the second outer row 121 and the second inner row 122. The heat exchange pipe of the rear heat exchanger 13 includes the third outer row 131 and the third inner row 132, and the first outer row 111, the second outer row 121, and the third outer row 131 are all main heat exchangers. It is located on the wind side of. The reason why the back tube heat exchanger 14 is added to the wind side of the main heat exchanger is to enhance the heat exchange capacity of the heat exchanger assembly 1, and the generality of the back tube heat exchanger 14 is not lost. To maximize energy efficiency, it is mounted on the wind side of the intermediate heat exchanger 12, which has the largest upwind area. In particular, the existence of a gap between the intermediate heat exchanger 12 and the rear heat exchanger 13 in close proximity to each other should be avoided as much as possible. In this embodiment, since the size is limited to the special equipment casing size of the air conditioner indoor unit, there is a gap between the intermediate heat exchanger 12 and the rear heat exchanger 13 in close proximity to each other, and the air enters through the intake port. In order to prevent the air from entering the once-through fan 4 without passing through the heat exchanger assembly 1, in this embodiment, an additional window is provided between the intermediate heat exchanger 12 and the wind side of the rear heat exchanger 13. The shield 16 is straddled and connected. For example, both ends of the window shield 16 are intermediate heat exchangers via sponges so as to realize the connection between the window shield 16 and the heat exchanger and to guarantee the sealability of the contact portion between the window shield 16 and the heat exchanger. 12 and the rear heat exchanger 13 are attached to each other (not limited to this). At the same time, the sponge bonding method facilitates the removal of the window shield when the user needs to repair or replace the heat exchanger assembly 1. Of course, in another embodiment, the window shield 16 can be further attached to the intermediate heat exchanger 12 and the rear heat exchanger 13 by a screw tightening method, and the present design is not limited to this. Further, even if there is a relatively large gap between the front heat exchanger 11 and the intermediate heat exchanger 12, by adding a window shield 16 between the two, wind can be blown into the gap of the heat exchanger assembly 1. You can avoid getting in.

It is understandable that there are outdoor unit heat exchangers, compressors, etc. in the air conditioner heat exchange circulation system in addition to the heat exchanger assembly 1 located indoors. In this embodiment, one end of the back tube heat exchanger 14 is connected to the main heat exchanger, the other end is connected to the first refrigerant total pipe 24, and the first refrigerant total pipe 24 is used for connection with the outdoor heat exchanger. ..

In this embodiment, referring to FIGS. 1 to 4, when the heat exchanger assembly 1 is cooled, the refrigerant sent out by the compressor first exchanges heat through the outdoor heat exchanger, and then the first refrigerant total pipe 24 It enters the back tube heat exchanger 14 through the back tube heat exchanger 14, and after passing through the back tube heat exchanger 14, it is divided into the first crossroads 21, the second crossroads 22 and the third crossroads 23, and the first crossroads 21, the second crossroads 22 and the third crossroads 23. Flow from the heat exchange tube on the wind side of the main heat exchanger toward the heat exchange tube on the leeward side. The first crossroads 21 and the second crossroads 22 share all the heat exchanger tubes of the front heat exchanger 11 and the intermediate heat exchanger 12, and at least one of the first crossroads 21 and the second crossroads 22 is the front heat exchanger 11. The third crossroads 23 flow through all the heat exchanger tubes of the rear heat exchanger 13. The first crossroads 21, the second crossroads 22, and the third crossroads 23 flow out of the main heat exchanger, then merge at the second refrigerant total pipe 25, and return to the compressor. When the heat exchanger assembly 1 is heated, the refrigerant sent out by the compressor first enters the heat exchanger assembly 1 through the second refrigerant total pipe 25, and enters the heat exchanger assembly 1, respectively, at the first crossroads 21, the second crossroads 22, and the third. After completing the heat exchange through the crossroads 23, they merge to flow through the back tube heat exchanger 14, and then enter the outdoor heat exchanger through the first refrigerant total pipe 24 to exchange heat, and finally return to the compressor. It should be explained that this design is not limited to this. In another embodiment, the first crossroads 21 flow through all the heat exchanger tubes of the front heat exchanger 11, while the second crossroads 22 and the third crossroads 23 are all of the intermediate heat exchangers 12 and the rear heat exchangers 13. At least one of the second crossroads 22 and the third crossroads 23 is installed so as to straddle the heat exchange pipes of the intermediate heat exchanger 12 and the rear heat exchanger 13. When the heat exchanger assembly 1 cools without losing generality, the refrigerant flows through the back tube heat exchanger 14 and then through the distributor 15 to the first crossroads 21, the second crossroads 22, and the third crossroads 23. .. Of course, in other embodiments, the refrigerant may be split by a structure such as a whistle-shaped tube. The design is not limited to that.

First, regarding the heat exchanger assembly 1 in this embodiment, it should be understood that under the cooling operating conditions, the heat exchanger pipes on the outside (wind side) of the first crossroads 21, the second crossroads 22, and the third crossroads 23 are all present. By adopting the principle of flow direction from the inside (downwind side) to the heat exchange pipe, the temperature difference of heat exchange is improved so as to improve the heat exchange efficiency to the maximum. In Table 1, under the cooling operating conditions of the heat exchanger assembly 1, the influence of the flow path gradually entering the inner heat exchange tube from the outer heat exchange tube and the flow path of another type on the APF (energy efficiency ratio). Was compared and analyzed.

Comparing the correspondence between the different flow path types and APF in Table 1, the flow path type adopted in this example, in which all three flow paths flow from the outer heat exchange pipe to the inner heat exchange pipe, can be seen. Most energy efficient.

As mentioned in the background technology, "Due to the limitation of the dimensions of the equipment casing 3, the difference in the number of heat exchanger tubes between the front heat exchanger 11 and the intermediate heat exchanger 12 is large, and the refrigerant is intermediate between the front heat exchanger 11 and the intermediate heat exchanger 11, respectively. In order to solve the technical problem that heat exchange becomes imbalanced and energy efficiency is low by exchanging heat with the heat exchanger 12, the flow path design of the heat exchanger 12 assembly 1 in this embodiment is performed. Also, the first crossroads 21 and the second crossroads 22 share the heat exchangers of the front heat exchanger 11 and the intermediate heat exchanger 12, and at least one of the first crossroads 21 and the second crossroads 22 is the front heat exchanger. It was emphasized that it is installed so as to be connected so as to be straddled between the heat exchange pipes of the intermediate heat exchanger 12 and the intermediate heat exchanger 12. That is, the flow path is not limited to flowing only through the front heat exchanger 11 or the intermediate heat exchanger 12, and some heat exchange tubes of both are connected in series. In this way, not only the lack of heat exchange of the front heat exchanger 11 can be compensated, but also the waste of the structure of the intermediate heat exchanger 12 can be avoided. Therefore, the heat exchange equilibrium between the front heat exchanger 11 and the intermediate heat exchanger 12 and the improvement of their energy efficiency can be effectively realized.

In this embodiment, the difference in the number of heat exchange tubes flowing through each of the first crossroads 21 and the second crossroads 22 is controlled to be less than or equal to three. This prevents the difference in heat exchange energy between the two from being too large and affecting the heat exchange equilibrium between the front heat exchanger 11 and the intermediate heat exchanger 12. In particular, by controlling the number of heat exchange tubes through which each of the first crossroads 21, the second crossroads 22, and the third crossroads 23 flows so that the difference between the two is less than or equal to 3, the front A heat exchange balance between the heat exchanger 11, the intermediate heat exchanger 12, and the rear heat exchanger 13 can be realized, and the energy efficiency of the entire heat exchanger assembly 1 can be improved.

In daily life, due to differences in the design of the living space of the user, in many cases, the requirements regarding the dimensions of the equipment casing 3 of the wall-mounted air conditioner indoor unit also differ. In this embodiment, the width dimension L in the front-rear direction of the equipment casing 3 is smaller than 800 mm, and the height dimension H in the vertical direction of the equipment casing 3 is smaller than 295 mm. For the heat exchanger assembly 1 that fits the dimensions of the equipment casing 3, the total number of heat exchanger tubes in the main heat exchanger is set to 18 to 22, so that the heat exchanger assembly can be installed in a limited mounting space. Guarantee that 1 is maintained with relatively high energy efficiency. In particular, in this embodiment, the number of heat exchange tubes of the main heat exchanger is 20. Further, if it is limited to the inside of the equipment casing 3 in such a dimension range, the diameter D of the once-through fan 4 is selected to 115 mm to 125 mm, and the main heat is taken into consideration comprehensively considering the energy efficiency and space occupancy of the once-through fan 4. Keep the distance S between the inner surface of the exchanger and the outer surface of the once-through fan 4 greater than 10 mm. The angle between the rear heat exchanger 13 and the vertical direction is set to ensure that the main heat exchanger surrounds the once-through fan in half to achieve a better heat exchange energy efficiency improvement effect and a highly reliable design for dew condensation drainage. It is located at 38 ° to 48 °, and the angle between the intermediate heat exchanger 12 and the front heat exchanger 11 and the vertical direction is maintained at 45 ° to 55 °.

The heat exchanger assembly 1 of the technical proposal of the present application includes a main heat exchanger and a back tube heat exchanger 14 installed on the wind side of the main heat exchanger, and the main heat exchanger is a front heat exchanger 11 and intermediate heat. Includes exchanger 12 and rear heat exchanger 13. When the heat exchanger assembly 1 cools, after passing through the back tube heat exchanger 14, the heat exchange flow path 2 splits into the first crossroads 21, the second crossroads 22, and the third crossroads 23, and the first crossroads 21 Flows through the front heat exchanger 11, the second crossroad 22 flows through the intermediate heat exchanger 12, and the third crossroad 23 flows through the rear heat exchanger 13. One of the first crossroads 21 and the third crossroads 23 is installed straddling the heat exchange pipe of the intermediate heat exchanger 12, and after improving the flow path in this way, the heat of the front heat exchanger 11 or the rear heat exchanger 13 is heated. The refrigerant that has passed through the exchange pipe can be allowed to continuously pass through a part of the heat exchange pipes of the intermediate heat exchanger 12, and the first crossroads 21 pass only through the heat exchange pipes of the front heat exchanger 11 or the third crossroads 23. Insufficient heat exchange of the refrigerant that can occur by passing only through the heat exchange tubes of the rear heat exchanger 13 (because the heat exchange tubes of the front heat exchanger 11 and the rear heat exchanger 13 are relatively small), and While avoiding the problem of structural waste (because there are relatively many heat exchangers in the intermediate heat exchanger 12) that can occur when the bifurcation road 22 passes only through the heat exchanger tube of the intermediate heat exchanger 12, the front heat exchanger 11. The heat exchange effect is more balanced between the rear heat exchanger 12 and the intermediate heat exchanger 13, and the energy efficiency of the heat exchanger assembly is effectively improved.

As is well known, by using a heat exchange tube having a small tube diameter, the material used for the heat exchange tube can be reduced, and thus the cost of the entire heat exchanger assembly 1 can be significantly reduced, but the refrigerant has a small tube diameter. When passing through the exchange pipe, the resistance of heat exchange is large and the pressure loss is large, which is disadvantageous to the circulating flow of the refrigerant. In this embodiment, the cost of the heat exchanger assembly 1 and the problem of the circulation flow efficiency of the refrigerant are comprehensively considered, and the heat exchange pipe diameter of the back pipe heat exchanger 14 is mainly used as the heat exchange pipe of the heat exchanger. Set larger than the diameter. As a result, when the heat exchanger assembly 1 is cooled, the refrigerant first enters the large-diameter heat exchanger of the back tube heat exchanger 14, and then enters the small-diameter heat exchanger of the main heat exchanger. .. That is, in the process of changing the refrigerant from the gas state to the liquid state, the contact area between the refrigerant and the heat exchange pipe is increased accordingly. When the heat exchanger assembly 1 heats, the refrigerant first splits and exchanges heat in the small tube diameter heat exchanger tube of the main heat exchanger, and then collectively into the large tube diameter heat exchanger tube of the back tube heat exchanger 14. enter. In Table 2, when the heat exchanger assembly 1 is in the heating operating condition, the influence of the refrigerant flow method on the APF at different pipe diameters is compared and analyzed.

Comparing the correspondence between the different flow path types and APF in Table 2, it can be seen that in the heating operating conditions adopted in this embodiment, the refrigerant first passes through the heat exchange pipe having a small pipe diameter, and then through the heat exchange pipe having a large pipe diameter. The energy efficiency of the flow path type that passes through the heat exchange tube is the highest. Without losing generality, the heat exchange tube of the back tube heat exchanger 14 adopts a tube diameter of Φ7, and the heat exchange tube of the main heat exchanger adopts a tube diameter of Φ5. It can be understood that the heat exchange tubes having a diameter of Φ7 and Φ5 are both heat exchange tubes widely used in the prior art. Therefore, selecting the heat exchange pipes having the above two types of pipe diameters helps to reduce the difficulty of obtaining the heat exchange pipes and the manufacturing cost of the heat exchanger assembly 1. Of course, in other embodiments, the heat exchangers of the back tube heat exchanger 14 and the main heat exchangers may have other tube diameter dimensions. For example, the heat exchange tube of the back tube heat exchanger 14 can adopt a tube diameter of Φ6. This design is not limited to this. By the way, in this embodiment, considering the requirement for energy efficiency of the heat exchanger assembly and the dimensional limitation of the equipment casing 3, the number of heat exchanger tubes of the back tube heat exchanger 14 is 2 to 4. Preferably, the back tube heat exchanger 14 is installed closer to the front heat exchanger than the rear heat exchanger so that the back tube heat exchanger 14 is better installed toward the intake port of the equipment casing 3.

Further, referring to FIGS. 1 to 4, the second crossroads 22 flows through a part of the heat exchange pipes of the intermediate heat exchanger 12, and the first crossroads 21 is the remaining heat exchange pipes of the intermediate heat exchanger 12 and the front. It flows through all the heat exchanger tubes of the heat exchanger 11. By installing in this way, when the heat exchange pipes through which the first crossroads 21 and the second crossroads 22 pass are close to each other, the design of the flow path can be simplified as much as possible, and the manufacturing difficulty of the main heat exchanger can be reduced. This design is not limited to this. In another embodiment, the second crossroads 22 flow through some heat exchanger tubes of the front heat exchanger 11 and the intermediate heat exchanger 12, and the first crossroads 21 are the rest of the front heat exchanger 11 and the intermediate heat exchanger 12. It should be explained that it flows through the heat exchange tube of.

In the following, we will introduce the specific flow path design of the main heat exchanger. Taking the case where the heat exchanger assembly 1 is in the cooling operating condition as an example, the first embodiment of the present application is as follows.

With reference to FIG. 2, the first crossroads 21 flow from the heat exchange pipe in the middle of the second outer row 121, flow toward the front heat exchanger 11 side along the second outer row 121, and pass through the first jumper pipe 17. Then, it enters the first outer row 111, flows through the first outer row 111 and the entire first inner row 112 in order, and flows out from the first inner row 112. The second crossroads 22 flow in from the second outer row 121, flow through the rest of the second outer row 121, and the entire second inner row 122, and flow out of the second inner row 122. The first crossroads 21 flow into the heat exchanger tube closest to the front heat exchanger 11 of the intermediate heat exchanger 12 and enter the front heat exchanger 11 through the first jumper tube 17 to reach the length of the first jumper tube 17. , And it is understandable that it helps reduce the gap between the front heat exchanger 11 and the intermediate heat exchanger 12. Specifically, the first crossroads 21 enters the front heat exchanger 11 via the two heat exchange pipes in the second outer row 121 and then through the first jumper pipe 17. It should be explained that the design is not limited to this, and in other embodiments, the first crossroads 21 may flow from heat exchange tubes at other positions in the second outer row 121.

Further, the second crossroad 22 flows from the heat exchange pipe adjacent to the heat exchange pipe into which the first crossroad 21 on the second outer row 121 flows, and flows toward the rear heat exchanger 13 side along the second outer row 121. .. The first crossroads 21 and the second crossroads 22 flow along the two opposite sides of the second outer row 121, respectively, thereby sharing the heat exchange pipes of the second outer row 121. By arranging in this way, it is possible to avoid having to change the flow direction of the second crossroads 22 in order to flow evenly through the heat exchange pipes of the second outer row 121. That is, it should be understood that the flow direction of the second crossroads 22 is simplified. Specifically, the second crossroads 22 enters the second inner row 122 after passing through the three heat exchange tubes of the second outer row 121. The present design is not limited to this, and in other embodiments, the second crossroads 22 flows from the rearmost heat exchange pipe of the second outer row 121 and is a front heat exchanger along the second outer row 121. It should be explained that the first crossroads 21 on the second outer row 121 flow toward the 11 side to the heat exchange pipe adjacent to the heat exchange pipe into which the first crossroads 21 flow.

Further, the first crossroads 21 enters the heat exchanger tube close to the intermediate heat exchanger 12 of the first outer row 111 via the first jumper pipe 17, and the entire first outer row 111 and the first inner row 112 are sequentially arranged. It flows out from the heat exchange tube near the intermediate heat exchanger 12 in the first inner row 112. By arranging in this way, the first crossroads 21 flows from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is in the first crossroads 21 so as to better realize the heat exchange of the coolant. Suitable for the relatively high energy of the refrigerant at this point. The flow path design in the front heat exchanger 11 is simplified by a method in which the first crossroads 21 flow through the entire first outer row 111 from top to bottom and then through the entire first inner row 112 from bottom to top. You should understand what you did. The design is not limited to this, and in other embodiments, the first crossroads 21 enters the front heat exchanger 11 from another heat exchanger tube in the first outer row 111 or other heat in the first inner row 112. It should be explained that the exchange pipe may be discharged from the front heat exchanger 11.

Further, the second crossroads 22 enters the heat exchanger tube from the second outer row 121 to the second inner row 122 near the rear heat exchanger 13, and is directed toward the front heat exchanger 11 side along the second inner row 122. It flows out from the heat exchange tube near the front heat exchanger 11 in the second inner row 122. By arranging in this way, it is sufficient to keep the second crossroads 22 flowing forward at all times, so that it is easy to design the flow direction, and it is understood that it helps to reduce the processing difficulty of the intermediate heat exchanger 12. Should be. The present design is not limited to this, and in other embodiments, the second crossroads 22 flow from the second outer row 121 to another heat exchange tube in the second inner row 122, or other in the second inner row 122. It should be explained that the heat exchanger can flow out of the intermediate heat exchanger 11.

Further, the third crossroads 23 flow from the heat exchange pipe near the intermediate heat exchanger 12 of the third outer row 131, and flow through the entire third outer row 131 and the third inner row 132 in order, and further flow through the entire third inner row 131. It flows out of the heat exchange tube near the intermediate heat exchanger 12 of 132. By arranging in this way, the third crossroads 23 flows from the upper end of the windward side of the rear heat exchanger 13, and the air volume at this position is in the third crossroads 23 so as to better realize the heat exchange of the coolant. Suitable for the relatively high energy of the refrigerant at this point. The flow path design in the rear heat exchanger 13 is simplified by a method in which the third crossroads 23 flow through the entire third outer row 131 from top to bottom and then through the entire third inner row 132 from bottom to top. You should understand what you did. The present design is not limited to this, and in other embodiments, the third crossroads 23 enters the rear heat exchanger 13 from another heat exchanger tube in the third outer row 131 or other heat in the third inner row 132. It should be explained that the rear heat exchanger 13 may be discharged through the exchange tube.

Based on the specific flow path design of the main heat exchanger in this embodiment, Table 3 compares and analyzes the influence of the distribution method of the number of heat exchange tubes at the three crossroads on APF.

As can be seen by comparing the correspondence between the number of heat exchange pipes and the APF in Table 3, the first crossroads 21 have 6 heat exchange pipes, the second crossroads 22 have 7 heat exchange pipes, and the third It is preferable to maximize the energy efficiency of the heat exchanger assembly 1 by adopting the idea that the crossroads 23 pass through seven heat exchanger tubes. By arranging in this way, the difference in the number of heat exchange pipes passing through the first crossroads 21 and the second crossroads 22 is 1, and the heat exchange pipes passing through the first crossroads 21 and the third crossroads 23 The difference in the number of pipes is 1, and the difference in the number of heat exchange pipes passing between the second crossroads 22 and the third crossroads 23 is zero. This was done for the difference in the number of heat exchanger tubes passing between any two crossroads to improve the energy efficiency of the heat exchanger assembly 1 described above, less than 3 or 3 It is clear that it agrees with the limitation of being equal to.

In the second embodiment of the present application, with reference to FIG. 3, the first crossroads 21 flow from the heat exchanger tube near the front heat exchanger 11 in the second outer row 121, and the front heat exchanger along the second outer row 121. It flows toward the 11 side, enters the first outer row 111 through the first jumper pipe 17, flows through the entire first outer row 111 and the first inner row 112 in order, and further passes through the second jumper pipe 18 to the second. It enters the inner row 122 and flows out from the second inner row 122. The second crossroads 22 flow from the second outer row 121, flow through the rest of the second outer row 121 and the second inner row 122, and flow out from the second inner row 122. The first crossroads 21 flow into the heat exchanger tube closest to the front heat exchanger 11 of the intermediate heat exchanger 12 and enter the front heat exchanger 11 through the first jumper tube 17 to reach the length of the first jumper tube 17. , And it is understandable that it helps reduce the gap between the front heat exchanger 11 and the intermediate heat exchanger 12. Specifically, the first crossroads 21 enters the front heat exchanger 11 via one heat exchange pipe in the second outer row 121 and then through the first jumper pipe 17. It should be explained that the design is not limited to this, and in other embodiments, the first crossroads 21 may flow from heat exchange tubes at other positions in the second outer row 121.

Further, the second crossroad 22 flows from the heat exchange pipe adjacent to the heat exchange pipe into which the first crossroad 21 on the second outer row 121 flows, and flows toward the rear heat exchanger 13 along the second outer row 121. The first crossroads 21 and the second crossroads 22 flow along the two opposite sides of the second outer row 121, respectively, thereby sharing the heat exchange pipes of the second outer row 121. By arranging in this way, it is possible to avoid having to change the flow direction of the second crossroads 22 in order to flow evenly through the heat exchange pipes of the second outer row 121. That is, it should be understood that the flow direction of the second crossroads 22 is simplified. Specifically, the second crossroads 22 enters the second inner row 122 after passing through the four heat exchange tubes of the second outer row 121. The present design is not limited to this, and in other embodiments, the second crossroads 22 flows from the rearmost heat exchange pipe of the second outer row 121 and is a front heat exchanger along the second outer row 121. It should be explained that the first crossroads 21 on the second outer row 121 flow toward the 11 side to the heat exchange pipe adjacent to the heat exchange pipe into which the first crossroads 21 flow.

Further, the first crossroads 21 enters the heat exchanger tube close to the intermediate heat exchanger 12 of the first outer row 111 via the first jumper pipe 17, and the entire first outer row 111 and the first inner row 112 are sequentially arranged. The flow further reaches the heat exchanger tube close to the intermediate heat exchanger 12 in the first inner row 112, and enters the second inner row 122 via the second jumper tube 18. By arranging in this way, the first crossroads 21 flows from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is the refrigerant in the first crossroads 21 so as to better realize the heat exchange of the refrigerant. Suitable for the relatively high energy at this point in time. The flow path design in the front heat exchanger 11 is simplified by a method in which the first crossroads 21 flow through the entire first outer row 111 from top to bottom and then through the entire first inner row 112 from bottom to top. did. In addition, the fact that the first crossroads 21 enters the intermediate heat exchanger 12 from the heat exchanger tube close to the intermediate heat exchanger 12 of the front heat exchanger 11 through the second jumper tube 18 means that the length of the second jumper tube 18 and It should be understood that it also helps reduce the gap between the front heat exchanger 11 and the intermediate heat exchanger 12. The design is not limited to this, and in other embodiments, the first crossroads 21 enter the front heat exchanger 11 from another heat exchanger tube in the first outer row 111 or other heat in the first inner row 112. It should be explained that the intermediate heat exchanger 12 may be entered from the exchange tube via the second jumper tube 18.

Further, the first crossroads 21 enters the heat exchanger tube near the front heat exchanger 11 of the second inner row 122 via the second jumper pipe 18 and heads toward the rear heat exchanger 13 side along the second inner row 122. And then flows out of the heat exchange tube in the middle of the second inner row 122. By arranging in this way, the first crossroads 21 can enter from the heat exchange pipe close to the front heat exchanger 11 in the second inner row 122, thereby increasing the length of the second jumper pipe 18 and the front heat exchanger 11. It is understandable that it helps reduce the gap between the intermediate heat exchanger 12 and the intermediate heat exchanger 12. Specifically, the first crossroads 21 are discharged from the intermediate heat exchanger 12 after passing through the two heat exchange pipes in the second inner row 122. The present design is not limited to this, and in other embodiments, the first crossroads 21 enters the intermediate heat exchanger 12 from another heat exchanger tube in the second inner row 122 or other heat in the second inner row 122. It should be explained that the exchange pipe may be discharged from the intermediate heat exchanger 12.

Further, the second crossroads 22 enters the heat exchanger tube from the second outer row 121 to the second inner row 122 near the rear heat exchanger 13, and is directed toward the front heat exchanger 11 side along the second inner row 122. It flows out from the heat exchange pipe adjacent to the heat exchange pipe from which the first crossroads 21 flow out. By arranging in this way, the second crossroads 22 need only be kept flowing forward after entering the second inner row 122, so that the design of the flow direction is easy and the intermediate heat exchanger 12 is difficult to process. It should be understood that it helps to reduce the degree. The present design is not limited to this, and in other embodiments, the second crossroads 22 flow from the second outer row 121 to another heat exchange tube in the second inner row 122, or other in the second inner row 122. It should be explained that the heat exchanger can flow out of the intermediate heat exchanger 11.

Further, the third crossroads 23 flow from the heat exchange pipe near the intermediate heat exchanger 12 of the third outer row 131, and flow through the entire third outer row 131 and the third inner row 132 in order, and further flow through the entire third inner row 131. It flows out of the heat exchange tube near the intermediate heat exchanger 12 of 132. By arranging in this way, the third crossroads 23 flows from the upper end of the windward side of the rear heat exchanger 13, and the air volume at this position is the refrigerant in the third crossroads 23 so as to better realize the heat exchange of the refrigerant. Suitable for the relatively high energy at this point in time. The flow path design in the rear heat exchanger 13 is simplified by a method in which the third crossroads 23 flow through the entire third outer row 131 from top to bottom and then through the entire third inner row 132 from bottom to top. You should understand what you did. The present design is not limited to this, and in other embodiments, the third crossroads 23 enters the rear heat exchanger 13 from another heat exchanger tube in the third outer row 131 or other heat in the third inner row 132. It should be explained that the rear heat exchanger 13 may be discharged through the exchange tube.

Based on the specific flow path design of the main heat exchanger in this embodiment, Table 4 analyzes the influence of the distribution method of the number of heat exchange tubes at the three crossroads on APF.

As can be seen by comparing the correspondence between the distribution method of the number of heat exchange pipes and APF in Table 4, the first crossroads 21 are eight heat exchange pipes, the second crossroads 22 are six heat exchange pipes, and the first It is preferable to maximize the energy efficiency of the heat exchanger assembly 1 by adopting the idea that the three crossroads 23 pass through seven heat exchanger tubes. By arranging in this way, the difference in the number of heat exchange pipes passing through the first crossroads 21 and the second crossroads 22 is 2, and the heat exchange pipes passing through the first crossroads 21 and the third crossroads 23 The difference in the number of lines is 1, and the difference in the number of heat exchange tubes passing between the second crossroads 22 and the third crossroads 23 is 1. This was done for the difference in the number of heat exchanger tubes passing between any two crossroads to improve the energy efficiency of the heat exchanger assembly 1 described above, less than or 3 It is clear that it agrees with the limitation of equality.

In the third embodiment of the present application, referring to FIG. 4, the first crossroads 21 flow from the heat exchange pipe near the intermediate heat exchanger 12 in the first outer row 111, and the first outer row 111 and the first inner row 112 In order, it reaches the heat exchange pipe near the intermediate heat exchanger 12 in the first inner row 112, further enters the second inner row 122 through the second jumper pipe 18, and flows out from the second inner row 122. The second crossroads 22 flow from the second outer row 121, flow through the entire second outer row 121 and the rest of the second inner row 122, and flow out of the second inner row 122. By arranging in this way, the first crossroads 21 flows from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is the refrigerant in the first crossroads 21 so as to better realize the heat exchange of the refrigerant. Suitable for the relatively high energy at this point in time. The flow path design in the front heat exchanger 11 has been simplified by a method in which the first crossroads 21 flow through the entire first outer row 111 from top to bottom and then through the entire first inner row 112 from bottom to top. .. Further, it should be understood that the second crossroads 22 do not need to straddle and enter the front heat exchanger 11, which helps reduce the difficulty of designing the flow path. The present design is not limited to this, and in other embodiments, the first crossroads 21 either flow from another heat exchange tube in the first outer row 111 or second from another heat exchange tube in the first inner row 112. It should be explained that the second inner row 122 may be entered through the jumper pipe 18.

Further, the second crossroads 22 flow from the heat exchange pipe near the front heat exchanger 11 of the second outer row 121, and heat exchange along the second outer row 121 near the rear heat exchanger 13 of the second outer row 121. It flows to the pipe and then into the second inner row 122. By arranging in this way, the second crossroads 22 can flow through the heat exchange pipe of the entire second outer row 121 without changing the flow direction when flowing through the second outer row 121, and the flow path can be easily designed and intermediate. It should be understood that it helps reduce the processing difficulty of the heat exchanger 12. The present design is not limited to this, and in other embodiments, the second crossroads 22 flow from a heat exchanger tube close to the rear heat exchanger 13 in the second outer row 121 and second along the second outer row 121. It should be explained that it flows to the heat exchange tube near the front heat exchanger 11 in the outer row 121 and then into the second inner row 122.

Further, the first crossroads 21 enters the heat exchanger tube near the front heat exchanger 11 of the second inner row 122 via the second jumper pipe 18 and heads toward the rear heat exchanger 13 side along the second inner row 122. And then flows out of the heat exchange tube in the middle of the second inner row 122. By arranging in this way, the first crossroads 21 can enter from the heat exchange pipe close to the front heat exchanger 11 in the second inner row 122, thereby increasing the length of the second jumper pipe 18 and the front heat exchanger 11. It is understandable that it helps reduce the gap between the intermediate heat exchanger 12 and the intermediate heat exchanger 12. Specifically, the first crossroads 21 are discharged from the intermediate heat exchanger 12 after passing through the two heat exchange pipes in the second inner row 122. The present design is not limited to this, and in other embodiments, the first crossroads 21 enters the intermediate heat exchanger 12 from another heat exchanger tube in the second inner row 122, or another in the second inner row 122. It should be explained that the heat exchanger tube may be discharged from the intermediate heat exchanger 12.

Further, the second crossroads 22 enters the heat exchanger tube from the second outer row 121 to the rear heat exchanger 13 of the second inner row 122, and flows along the second inner row 122 toward the front heat exchanger tube side. Further, it flows out from the heat exchange pipe adjacent to the heat exchange pipe that flows out from the first crossroads 21. Since the second crossroads 22 need only be kept flowing forward after entering the second inner row 122, the flow direction can be easily designed, which helps to reduce the processing difficulty of the intermediate heat exchanger 12. The present design is not limited to this, and in other embodiments, the second crossroads 22 flow from the second outer row 121 to another heat exchange tube in the second inner row 122, or other in the second inner row 122. It should be explained that the heat exchanger can flow out of the intermediate heat exchanger 11.

Further, the third crossroads 23 flow from the heat exchange pipe near the intermediate heat exchanger 12 of the third outer row 131, and flow through the entire third outer row 131 and the third inner row 132 in order, and further flow through the entire third inner row 131. It flows out of the heat exchange tube near the intermediate heat exchanger 12 of 132. By arranging in this way, the third crossroads 23 flows from the upper end of the windward side of the rear heat exchanger 13, and the air volume at this position is the refrigerant in the third crossroads 23 so as to better realize the heat exchange of the refrigerant. Suitable for the relatively high energy at this point in time. The flow path design in the rear heat exchanger 13 is simplified by a method in which the third crossroads 23 flow through the entire third outer row 131 from top to bottom and then through the entire third inner row 132 from bottom to top. You should understand what you did. The present design is not limited to this, and in other embodiments, the third crossroads 23 enters the rear heat exchanger 13 from another heat exchanger tube in the third outer row 131, or another in the third inner row 132. It should be explained that the heat exchanger can be discharged from the rear heat exchanger 13.

Based on the specific flow path design of the main heat exchanger in this embodiment, Table 5 compares and analyzes the influence of the distribution method of the number of heat exchange tubes at the three crossroads on APF.

As can be seen by comparing the correspondence between the distribution method of the number of heat exchange pipes and APF in Table 5, the first crossroads 21 has seven heat exchange pipes, the second crossroads 22 has seven heat exchange pipes, and the first It is preferable to maximize the energy efficiency of the heat exchanger assembly 1 by adopting the idea that the three crossroads 23 pass through seven heat exchanger tubes. By arranging in this way, the difference in the number of heat exchange pipes passing through the first crossroads 21 and the second crossroads 22 is 0, and the heat exchange pipes passing through the first crossroads 21 and the third crossroads 23 The difference in the number of heat exchange pipes is 0, and the difference in the number of heat exchange pipes passing between the second crossroads 22 and the third crossroads 23 is 0. This is less than or equal to 3 made for the difference in the number of heat exchange tubes passing between any two crossroads in order to improve the energy efficiency of the heat exchanger assembly 1 described above. It is clear that this is consistent with the limitation.

The present application further proposed an air conditioner including an air conditioner outdoor unit and an air conditioner indoor unit. For the specific structure of the air conditioner indoor unit, refer to the above embodiment. Since this air conditioner indoor unit has adopted all the technical proposals of all the above-mentioned implementations, it has at least all the beneficial effects brought about by the technical proposals of the above-mentioned examples, and is not verbose here one by one.

The above is merely a preferred embodiment of the present application and does not limit the scope of the present application. Equivalent structural transformations made using the contents of the specification and accompanying drawings of the present application under the application concept of the present application, or direct / indirect applications to other related technical fields are all patents of the present application. Included in the scope of protection.

1 Heat exchanger assembly 11 Front heat exchanger 111 First outer row 112 First inner row 12 Intermediate heat exchanger 121 Second outer row 122 Second inner row 13 Rear heat exchanger 131 Third outer row 132 Third inner Row 14 Back pipe heat exchanger 15 Distributor 16 Window shield 17 1st jumper pipe 18 2nd jumper pipe 2 Heat exchange flow path 21 1st crossroads 22 2nd crossroads 23 3rd crossroads 24 1st total refrigerant pipe 25 2nd refrigerant Total pipe 3 Equipment casing 4 once-through fan

Claims (19)

It is a heat exchanger assembly used for air conditioner indoor units.
A main heat exchanger installed in a semi-enclosed shape, including a front heat exchanger, an intermediate heat exchanger and a rear heat exchanger, the front heat exchanger, the intermediate heat exchanger and the rear heat exchange. At least two rows of heat exchangers are installed in each in the intake direction, and the number of heat exchangers of the intermediate heat exchanger is larger than that of the front heat exchanger and the rear heat exchanger.
Including the back tube heat exchanger installed on the windward side of the main heat exchanger,
When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first crossroad, a second crossroad and a third crossroad after passing through the back tube heat exchanger, and the first crossroads. , The second crossroads and the third crossroads both flow from the heat exchange pipe on the wind side of the main heat exchanger toward the heat exchange pipe on the leeward side, and the first crossroads pass through the heat exchange pipe of the front heat exchanger. Flow, the second crossroads flow through the heat exchange tubes of the intermediate heat exchanger, the third crossroads flow through the heat exchange tubes of the rear heat exchanger, and at least one of the first and third crossroads is said. It is installed across the heat exchange tube of the intermediate heat exchanger ,
The third crossroads flow through all the heat exchanger tubes of the rear heat exchanger, the second crossroads flow through some heat exchange tubes of the intermediate heat exchanger, and the first crossroads flow through the intermediate heat exchangers. Flow through the remaining heat exchange tubes and all heat exchange tubes of the front heat exchanger.
Heat exchanger assembly. The heat exchanger assembly according to claim 1, wherein the difference between the number of heat exchanger tubes through which the first crossroads, the second crossroads, and the third crossroads flow is less than or equal to 3. The front heat exchanger, the intermediate heat exchanger, and the rear heat exchanger are all provided with two rows of heat exchanger tubes, and the total number of heat exchanger tubes of the main heat exchanger is 18 to 22 according to claim 2. The heat exchanger assembly described. The heat exchange tube of the front heat exchanger includes a first outer row and a first inner row, and the heat exchange tube of the intermediate heat exchanger includes a second outer row and a second inner row, and includes the first outer row and the first inner row. The second outer row is located on the wind side of the main heat exchanger and is located on the wind side.
When the heat exchanger assembly cools, the first crossroads flow from the second outer row, flow along the second outer row, enter the first outer row via the first jumper pipe, and enter the first outer row. The entire outer row and first inner row flow in sequence and flow out of the first inner row, the second crossroads flow in from the second outer row, the rest of the second outer row, and the second inner row. The heat exchanger assembly according to claim 1 , which flows through the entire row and flows out of the second inner row. The first crossroads flow from the heat exchange pipe in the middle of the second outer row, flow toward the front heat exchanger side along the second outer row, and further pass through the first jumper pipe to the first outer row. Enter the heat exchange tube close to the intermediate heat exchanger in the row, flow through the entire first outer row and first inner row in order, and further from the heat exchange tube close to the intermediate heat exchanger in the first inner row. The heat exchanger assembly according to claim 4, which flows out. The second crossroads flow from a heat exchange tube adjacent to the heat exchange tube into which the first crossroads on the second outer row flow, flow along the second outer row toward the rear heat exchanger side, and said. It flows from the second outer row into the heat exchange tube near the rear heat exchanger in the second inner row, flows toward the front heat exchanger side along the second inner row, and further flows in the second inner row. The heat exchanger assembly according to claim 5, which flows out of a heat exchanger tube close to the front heat exchanger. The rear heat exchanger includes a third inner row and a third outer row, the third outer row being located on the windward side of the main heat exchanger.
The third crossroads flow from a heat exchange tube near the intermediate heat exchanger in the third outer row, then flow through the entire third outer row and third inner row in order, and further flow through the third inner row. The heat exchanger assembly according to claim 1 , wherein the heat exchanger assembly flows out of a heat exchanger tube close to the intermediate heat exchanger. The heat exchange tube of the front heat exchanger includes a first outer row and a first inner row, and the heat exchange tube of the intermediate heat exchanger includes a second outer row and a second inner row of the rear heat exchanger. The heat exchange pipe includes a third outer row and a third inner row, and the first outer row, the second outer row, and the third outer row are all installed close to the wind side of the main heat exchanger.
When the heat exchanger assembly is cooled, the first crossroads flow from the first outer row, flow through the entire first outer row and the first inner row in order, and further pass through the first jumper pipe to the first. Entering the second inner row and flowing out of the second inner row, the second crossroads flow in from the second outer row, flow through the entire second outer row and the rest of the second inner row in order, and According to claim 1, the third crossroads flow out from the second inner row, flow from the third outer row, flow through the entire third outer row and the third inner row in order, and flow out from the third inner row. The heat exchanger assembly described. The first crossroads enter from a heat exchange tube close to the intermediate heat exchanger in the first outer row, flow through the entire first outer row and the first inner row in order, and the intermediate heat in the first inner row. The heat exchanger assembly according to claim 8 , wherein the heat exchanger assembly reaches the heat exchanger tube close to the exchanger and further enters the second inner row via the first jumper tube. The heat exchange tube of the front heat exchanger includes a first outer row and a first inner row, and the heat exchange tube of the intermediate heat exchanger includes a second outer row and a second inner row of the rear heat exchanger. The heat exchange pipe includes a third outer row and a third inner row, and the first outer row, the second outer row, and the third outer row are all installed close to the wind side of the main heat exchanger.
When the heat exchanger assembly cools, the first crossroads flow from the second outer row, flow along the second outer row and enter the first outer row via the first jumper tube, and said. It flows through the entire first outer row and the first inner row in order, then enters the second inner row through the second jumper pipe, flows out from the second inner row, and the second crossroads is from the second outer row. It flows in, flows through the second outer row and the rest of the second inner row in order, and flows out of the second inner row, the third crossroads flow in from the third outer row, and the third outer row and the first. (3) The heat exchanger assembly according to claim 1, which flows in order with the entire inner row and flows out from the third inner row. The heat exchanger assembly according to claim 1, wherein the diameter of the heat exchanger of the back tube heat exchanger is larger than the diameter of the heat exchanger of the main heat exchanger. The heat exchanger assembly according to claim 11 , wherein the back tube heat exchanger is attached to the windward side of the intermediate heat exchanger. The heat exchanger assembly according to claim 12 , wherein the back tube heat exchanger is installed closer to the front heat exchanger than the rear heat exchanger. The heat exchanger assembly according to claim 11 , wherein the number of heat exchanger tubes of the back tube heat exchanger is 2 to 4. An air conditioner indoor unit including a heat exchanger assembly and an equipment casing installed to accommodate the heat exchanger assembly, wherein the heat exchanger assembly is.
A main heat exchanger installed in a semi-enclosed shape, including a front heat exchanger, an intermediate heat exchanger and a rear heat exchanger, the front heat exchanger, the intermediate heat exchanger and the rear heat exchange. At least two rows of heat exchangers are installed in each in the intake direction, and the number of heat exchangers of the intermediate heat exchanger is larger than that of the front heat exchanger and the rear heat exchanger.
Including the back tube heat exchanger mounted on the windward side of the main heat exchanger.
When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first crossroad, a second crossroad and a third crossroad after passing through the back tube heat exchanger, and the first crossroads. , The second crossroads and the third crossroads both flow from the heat exchange pipe on the wind side of the main heat exchanger toward the heat exchange pipe on the leeward side, and the first crossroads pass through the heat exchange pipe of the front heat exchanger. Flow, the second crossroads flow through the heat exchange tubes of the intermediate heat exchanger, the third crossroads flow through the heat exchange tubes of the rear heat exchanger, and at least one of the first and third crossroads is said. It is installed across the heat exchange tube of the intermediate heat exchanger ,
The third crossroads flow through all the heat exchanger tubes of the rear heat exchanger, the second crossroads flow through some heat exchange tubes of the intermediate heat exchanger, and the first crossroads flow through the intermediate heat exchangers. Flow through the remaining heat exchange tubes and all heat exchange tubes of the front heat exchanger.
Air conditioner indoor unit. The air conditioner indoor unit according to claim 15 , wherein the width dimension along the front-rear direction of the equipment casing is smaller than 800 mm, and the height dimension along the vertical direction of the equipment casing is smaller than 295 mm. The air conditioner indoor unit according to claim 15 , wherein when the heat exchanger assembly is provided in the equipment casing, the angle range between the arrangement direction and the vertical direction of the rear heat exchanger is 38 ° to 48 °. The fifteenth aspect of claim 15, wherein when the heat exchanger assembly is provided in the equipment casing, the angle range between the arrangement direction and the vertical direction of the intermediate heat exchanger and the front heat exchanger is 45 ° to 55 °. Air conditioner indoor unit. The adjacent ends of the intermediate heat exchanger and the rear heat exchanger are in contact with each other, or there is a gap between the adjacent ends of the intermediate heat exchanger and the rear heat exchanger. The air conditioner indoor unit according to claim 15 , wherein the air conditioner indoor unit further includes a window shield connected so as to straddle between the wind side of the ends of the intermediate heat exchanger and the rear heat exchanger that are close to each other.

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