Micro-channel heat exchanger and air conditioner thereof

Abstract

The utility model discloses a microchannel heat exchanger and an air conditioner thereof, the microchannel heat exchanger comprises: a first microchannel coil pipe, two ends of which are respectively provided with a first collecting pipe and a second collecting pipe; a third collecting pipe and a fourth collecting pipe are arranged at the two ends of the second micro-channel coil pipe respectively; the first collecting pipe is arranged to be close to the fourth collecting pipe and far away from the third collecting pipe; the second collecting pipe is arranged to be close to the third collecting pipe and far away from the fourth collecting pipe. According to the micro-channel heat exchanger, starting from the pipe arrangement and the liquid inlet mode of the micro-channel coil pipes, in one embodiment of the micro-channel heat exchanger, the first flow collecting pipe, with the lower temperature, of the first micro-channel coil pipe is adjacent to the fourth flow collecting pipe, with the higher temperature, of the second micro-channel coil pipe; the second flow collecting pipe with the higher temperature of the first micro-channel coil pipe is adjacent to the third flow collecting pipe with the lower temperature of the second micro-channel coil pipe, so that the heat exchange performance is improved, and the air outlet temperature layering problem is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioning, and in particular relates to a microchannel heat exchanger and an air conditioner thereof. Background Art

[0002] With the rapid development of science and technology, our requirements for data center rooms are becoming increasingly stringent, especially in terms of temperature control in the room. In order to meet these requirements, data center rooms usually use precision air conditioning for temperature control. As a core component in the air conditioning system, the role of the microchannel heat exchanger cannot be ignored. The equivalent diameter of the microchannel heat exchanger is between 10-1000μm. Due to its all-aluminum material, it is cheaper than the copper tube aluminum fin heat exchanger. In terms of structure, the microchannel heat exchanger has a higher heat exchange efficiency, so it has been widely used in many fields.

[0003] The microchannel heat exchanger consists of two manifolds, a microchannel coil group connecting the two manifolds, and fins arranged between the microchannel coils. The microchannel coils are provided with a number of fine flow channels for the circulation of the refrigerant. Its working principle is: the refrigerant flows in from the inlet end of the manifold, then enters the microchannel coil, and exchanges heat with the outside air to achieve the effect of cooling or heating. Ideally, the refrigerant should be evenly distributed in the microchannels of each microchannel coil to ensure the optimal operating efficiency of the heat exchanger. However, the actual situation is that after the refrigerant enters the manifold, due to the resistance of the manifold and the microchannel coil and the complex phase state of the refrigerant, the refrigerant is difficult to be evenly distributed in the microchannel coil, which not only affects the heat exchange efficiency of the heat exchanger, but also easily leads to the problem of uneven air outlet temperature of the air conditioner.

[0004] In order to meet the needs of different computer room environments, we need to choose the appropriate air supply mode of air conditioning to give full play to the role of precision air conditioning. The existing air supply modes of air conditioning units mainly include downward air supply, upward air supply and horizontal air supply. For the blowing horizontal air supply air conditioning unit, the cold air treated by the heat exchanger will directly enter the air supply channel or computer room, and there is no air supply mixing process. Affected by the overheating section of the heat exchanger, the problem of air supply temperature stratification is difficult to avoid, which is extremely unfavorable for the temperature control of the data center computer room. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a microchannel heat exchanger with uniform air supply temperature and an air conditioner thereof.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] A microchannel heat exchanger, comprising:

[0008] The first microchannel coil has a first header for refrigerant to flow in and a second header for refrigerant to flow out, respectively, at both ends;

[0009] The second microchannel coil has a third header for refrigerant inflow and a fourth header for refrigerant outflow at both ends.

[0010] The first current collector is arranged close to the fourth current collector and away from the third current collector;

[0011] The second current collecting pipe is arranged close to the third current collecting pipe and far away from the fourth current collecting pipe.

[0012] Further, the first current collector and the fourth current collector are stacked and arranged together, and the second current collector and the third current collector are stacked and arranged together.

[0013] Furthermore, the first microchannel coil and the second microchannel coil are both in a straight line shape.

[0014] Furthermore, the first microchannel coil and the second microchannel coil are both in a "U" shape, and the first header, the second header, the third header and the fourth header are stacked together.

[0015] A microchannel heat exchanger, comprising:

[0016] The first microchannel coil has a first header for refrigerant to flow in and a second header for refrigerant to flow out, respectively, at both ends;

[0017] The second microchannel coil has a third header for refrigerant inflow and a fourth header for refrigerant outflow at both ends.

[0018] A third microchannel coil, wherein two ends of the third microchannel coil are respectively provided with a fifth header for refrigerant to flow in and a sixth header for refrigerant to flow out;

[0019] The second microchannel coil and the third microchannel coil are connected in series along the refrigerant flow direction; the third header and the sixth header are close together, the fourth header and the second header are stacked together, and the fifth header and the first header are stacked together.

[0020] Furthermore, the first microchannel coil, the second microchannel coil and the third microchannel coil are all in a straight line shape.

[0021] Further, the first collector, the second collector, the third collector, the fourth collector, the fifth collector, the sixth collector, the third collector, the sixth collector, the fourth collector and the second collector are stacked together, and the fifth collector and the first collector are stacked together.

[0022] An air conditioner comprises the above-mentioned microchannel heat exchanger.

[0023] Furthermore, the microchannel heat exchanger is placed at an angle, and the angle between the microchannel heat exchanger and the air flow direction is an acute angle.

[0024] Beneficial effects of the utility model:

[0025] The microchannel heat exchanger of the present application starts with the arrangement of the pipes of the microchannel coil and the liquid inlet method, and the first microchannel coil and the second microchannel coil are stacked and installed. In one embodiment of the present application, the first header with a lower temperature of the first microchannel coil is adjacent to the fourth header with a higher temperature of the second microchannel coil, and the second header with a higher temperature of the first microchannel coil is adjacent to the third header with a lower temperature of the second microchannel coil, which strengthens the mixing of the air supply, helps to improve the heat exchange performance, and improves the problem of stratification of the outlet air temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A side view of a microchannel heat exchanger of the utility model in one embodiment;

[0027] Figure 2 It is a side view of a microchannel heat exchanger of the utility model in yet another embodiment;

[0028] Figure 3 It is a side view of the microchannel heat exchanger of the utility model in another embodiment;

[0029] Figure 4 It is a schematic diagram of application scenarios of a microchannel heat exchanger and a blowing-type horizontal air supply air conditioner in the prior art;

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of a microchannel heat exchanger in the prior art;

[0031] Figure 6 It is a side view of a microchannel heat exchanger in the prior art.

[0032] Reference numerals include:

[0033] 100—microchannel heat exchanger 110—first microchannel coil

[0034] 111—first refrigeration section 112—first superheating section

[0035] 121 - first header 122 - second header

[0036] 130—Second microchannel coil 131—Second refrigeration section

[0037] 132—Second superheating section 141—Third header

[0038] 142—Fourth manifold 150—Third microchannel coil

[0039] 161 - fifth manifold 162 - sixth manifold DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] Figure 4 The present invention shows an example of a blower-type horizontal air supply air conditioner and its application in a computer room. In particular, for air conditioner units using microchannel heat exchangers as heat exchangers, the problem of air supply temperature stratification is particularly serious. In the current technology, microchannel heat exchangers usually adopt a bottom-in and top-out liquid flow method (such as Figure 5 and Figure 6This design causes the superheat section of the heat exchanger to be mainly concentrated in the upper part, so that the air blown out from the upper part of the heat exchanger has less heat exchange and higher temperature than the air blown out from the lower part, resulting in the phenomenon of air outlet temperature stratification.

[0045] Please refer to Figure 1 , which is a preferred embodiment of the utility model, the microchannel heat exchanger includes: a first microchannel coil 110, with a first header 121 for refrigerant to flow in and a second header 122 for refrigerant to flow out at both ends; a second microchannel coil 130, with a third header 141 for refrigerant to flow in and a fourth header 142 for refrigerant to flow out at both ends; the first header 121 is arranged to be close to the fourth header 142 and away from the third header 141; the second header 122 is arranged to be close to the third header 141 and away from the fourth header 142.

[0046] The microchannel heat exchanger of the utility model in this embodiment starts with the arrangement of the pipes of the microchannel coil and the liquid inlet method, and the first microchannel coil 110 and the second microchannel coil 130 are stacked and installed in the liquid inlet method of upper inlet and lower outlet and lower inlet and upper outlet, respectively. The first header 121 of the first microchannel coil 110 with a lower temperature is arranged adjacent to the fourth header 142 of the second microchannel coil 130 with a higher temperature, and the second header 122 of the first microchannel coil 110 with a higher temperature is arranged adjacent to the third header 141 of the second microchannel coil 130 with a lower temperature, which strengthens the mixing of the air supply, helps to improve the heat exchange performance, and improves the problem of stratification of the outlet air temperature.

[0047] like Figure 1 As shown, the microchannel heat exchanger in this embodiment includes a first microchannel coil 110, a first header 121, a second header 122, a second microchannel coil 130, a third header 141, and a fourth header 142. The above components are further described in detail below.

[0048] The first micro-channel coil 110 and the second micro-channel coil 130 are both in a straight line shape and are stacked together.

[0049] The first microchannel coil 110 is provided with a first header 121 for refrigerant to flow in and a second header 122 for refrigerant to flow out at both ends thereof. That is, the first header 121 is horizontally arranged at the inlet end of the first microchannel coil 110, and the second header 122 is horizontally arranged at the outlet end of the first microchannel coil 110. The half section of the first microchannel coil 110 close to the first header 121 is the first refrigeration section 111, and the half section of the first microchannel coil 110 close to the second header 122 is the first superheating section 112, and the first refrigeration section 111 and the first superheating section 112 are sequentially connected together along the refrigerant flow direction therein.

[0050] like Figure 1 As shown, similar to the first microchannel coil 110, the second microchannel coil 130 is provided with a third header 141 for refrigerant to flow in and a fourth header 142 for refrigerant to flow out at both ends. That is, the third header 141 is horizontally arranged at the inlet end of the second microchannel coil 130, and the fourth header 142 is horizontally arranged at the outlet end of the second microchannel coil 130. The half section of the second microchannel coil 130 close to the third header 141 is the second refrigeration section 131, and the half section of the second microchannel coil 130 close to the fourth header 142 is the second superheating section 132. The second refrigeration section 131 and the second superheating section 132 are sequentially connected together along the refrigerant flow direction therein. The refrigeration section and superheating section of the utility model refer to the refrigerant flowing in the pipeline for heat exchange. In a section near the first header, the third header and the fifth header, the refrigerant evaporates and absorbs heat. The heat exchange method is phase change heat exchange, and the temperature remains basically unchanged. When the refrigerant is completely evaporated, in another section near the second header, the fourth header and the sixth header, the completely evaporated refrigerant vapor continues to exchange heat with the air at a higher temperature, and the temperature rises to generate superheated steam. The length of the refrigeration section and the superheating section in this application changes dynamically with the evaporation effect of the refrigerant, and is not a fixed physical structure.

[0051] The first refrigeration section 111 and the second superheating section 132 are stacked together, and the first superheating section 112 and the second refrigeration section 131 are stacked together. That is, in this embodiment, the first header 121 and the fourth header 142 are stacked together, and the second header 122 and the third header 141 are stacked together. The first superheating section 112 and the second superheating section 132 are interlaced with each other to strengthen the mixing of the air supply, which helps to improve the heat exchange performance and improve the problem of air outlet temperature stratification.

[0052] like Figure 2As shown, it is another embodiment of the present application, which is substantially the same as the embodiment 1, except that, in the present embodiment, the first microchannel coil 110 and the second microchannel coil 130 are not in a "I" shape, but are both in a "U" shape. The first microchannel coil 110 and the second microchannel coil 130 can be folded in half at both ends in the previous embodiment, so that the first header 121, the second header 122, the third header 141 and the fourth header 142 are stacked together, and the first refrigeration section 111, the first superheating section 112, the second refrigeration section 131 and the second superheating section 132 are stacked together, which strengthens the air supply mixing, helps to improve the heat exchange performance and improve the problem of air outlet temperature stratification.

[0053] like Figure 3 As shown, it is another embodiment of the present application, and the microchannel heat exchanger in this embodiment mainly includes a first microchannel coil 110, a second microchannel coil 130 and a third microchannel coil 150. The first microchannel coil 110, the second microchannel coil 130 and the third microchannel coil 150 are all in a "one" shape.

[0054] In this embodiment, the first microchannel coil 110 is similar to the above two embodiments, and also includes a first refrigeration section 111 and a first superheating section 112, and the first refrigeration section 111 and the first superheating section 112 are sequentially connected together along the refrigerant flow direction therein. The first microchannel coil 110 is provided with a first header 121 for the refrigerant to flow in and a second header 122 for the refrigerant to flow out at both ends.

[0055] The second microchannel coil 130 and the third microchannel coil 150 are connected in series along the refrigerant flow direction. That is to say, the refrigerant first flows through the second microchannel coil 130 in a bottom-in-top-out liquid inlet manner for heat exchange, and then flows into the third microchannel coil 150 through the external connecting pipe. The refrigerant state in the second microchannel coil 130 is basically evaporation and heat absorption. The coil 130 basically belongs to the evaporation refrigeration section, and the overheating section will be mainly concentrated in the coil 150. Specifically, in this embodiment, the two ends of the second microchannel coil 130 are respectively provided with a third header 141 for refrigerant inflow and a fourth header 142 for refrigerant outflow. The two ends of the third microchannel coil 150 are respectively provided with a fifth header 161 for refrigerant inflow and a sixth header 162 for refrigerant outflow.

[0056] like Figure 3As shown, the third header 141 and the sixth header 162 are close together, the fourth header 142 and the second header 122 are stacked together, and the fifth header 161 and the first header 121 are stacked together. In this way, the second microchannel coil 130 and the first superheating section 112 are stacked together, and the third microchannel coil 150 and the first cooling section 111 are stacked together, which strengthens the air supply mixing, helps to improve the heat exchange performance, and improves the problem of air outlet temperature stratification.

[0057] It is understandable that the second microchannel coil 130 and the third microchannel coil 150 are not necessarily of the same length, and can be optimized and adjusted according to specific actual effects to find the best length ratio between the second microchannel coil 130 and the third microchannel coil 150.

[0058] The present application also discloses an air conditioner, comprising the microchannel heat exchanger 100 described in any one of the above embodiments. The placement mode and tilt angle of the microchannel heat exchanger 100 are not limited, and different microchannel coil stacking modes and different liquid inlet and outlet modes can be set according to actual needs. For example, in one embodiment of the present application, the microchannel heat exchanger 100 is placed at an angle, and the angle with the air flow direction is an acute angle. Such a setting can increase the heat exchange area of ​​the heat exchanger and improve the heat exchange capacity of the air conditioner. The air conditioner can be a horizontal blowing type or other forms.

[0059] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A microchannel heat exchanger, characterized in that: include: The first microchannel coil (110) is provided with a first header (121) for the refrigerant to flow in and a second header (122) for the refrigerant to flow out at both ends; The second microchannel coil (130) is provided with a third header (141) for the refrigerant to flow in and a fourth header (142) for the refrigerant to flow out at both ends; The first current collecting pipe (121) is arranged close to the fourth current collecting pipe (142) and away from the third current collecting pipe (141); The second current collecting pipe (122) is arranged close to the third current collecting pipe (141) and away from the fourth current collecting pipe (142).

2. The microchannel heat exchanger according to claim 1, characterized in that: The first current collecting pipe (121) and the fourth current collecting pipe (142) are arranged together in a stacked manner, and the second current collecting pipe (122) and the third current collecting pipe (141) are arranged together in a stacked manner.

3. The microchannel heat exchanger according to claim 2, characterized in that: The first microchannel coil (110) and the second microchannel coil (130) are both in the shape of a straight line.

4. The microchannel heat exchanger according to claim 2, characterized in that: The first microchannel coil (110) and the second microchannel coil (130) are both in a "U" shape, and the first header (121), the second header (122), the third header (141) and the fourth header (142) are stacked and arranged together.

5. A microchannel heat exchanger, characterized in that: include: The first microchannel coil (110) is provided with a first header (121) for the refrigerant to flow in and a second header (122) for the refrigerant to flow out at both ends; The second microchannel coil (130) is provided with a third header (141) for the refrigerant to flow in and a fourth header (142) for the refrigerant to flow out at both ends; A third microchannel coil (150), wherein two ends of the third microchannel coil (150) are respectively provided with a fifth header (161) for the refrigerant to flow in and a sixth header (162) for the refrigerant to flow out; The second microchannel coil (130) and the third microchannel coil (150) are connected in series along the refrigerant flow direction; the third header (141) and the sixth header (162) are close together.

6. The microchannel heat exchanger according to claim 5, characterized in that: The first microchannel coil (110), the second microchannel coil (130) and the third microchannel coil (150) are all in the shape of a straight line.

7. The microchannel heat exchanger according to claim 6, characterized in that: The fourth collector (142) and the second collector (122) are stacked together, and the fifth collector (161) and the first collector (121) are stacked together.

8. An air conditioner, characterized in that: A microchannel heat exchanger (100) comprising any one of claims 1 to 7.

9. The air conditioner according to claim 8, characterized in that: The microchannel heat exchanger (100) is placed at an angle, and the angle between the microchannel heat exchanger (100) and the air flow direction is an acute angle.

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