Air conditioning unit with heat recovery function

Abstract

The utility model relates to an air conditioning unit with a heat recovery function, which comprises a shell, a fresh air cavity, a waste discharge cavity, an air supply cavity, an air return cavity and a condensation cavity are separated in the shell by partition plates, a waste discharge fan is mounted in the waste discharge cavity, a waste discharge inlet and a waste discharge outlet are arranged on the shell corresponding to the waste discharge cavity, and the waste discharge inlet and the waste discharge outlet are communicated with the waste discharge cavity. A fresh air inlet is formed in the position, corresponding to the fresh air cavity, of the shell, a heat pipe heat exchanger is installed corresponding to the fresh air cavity and the waste exhaust cavity, and fresh air and waste exhaust air exchange heat with the condensation end and the evaporation end of the heat pipe heat exchanger respectively. Heat exchange between fresh air and waste discharge is achieved through the heat pipe exchanger, the structure is simpler, the size is small, the occupied space in the air conditioning unit is reduced, the heat exchange effect is guaranteed, meanwhile, the size of the air conditioning unit is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicle air-conditioning systems, in particular to an air-conditioning unit with a heat recovery function. Background Art

[0002] Rail vehicle air conditioning requires a large amount of oxygen due to its large passenger capacity. Therefore, the proportion of fresh air in the total air supply is relatively large, generally between 20% and 40%. When the vehicle introduces fresh air, the same amount of air inside the vehicle is discharged from the vehicle body, which is called exhaust air. However, the temperature of the exhaust air is consistent with the temperature inside the vehicle. When the exhaust air is discharged, a large amount of cooling / heat will be lost in the vehicle.

[0003] Chinese patent No. 202311263828.1 discloses an air conditioning unit comprising a housing, an indoor chamber disposed within the housing, a waste heat recovery chamber, and an outdoor chamber. The housing is provided with a fresh air inlet and a waste gas inlet, and a total heat exchanger is provided at the fresh air inlet. Both the fresh air inlet and the waste gas inlet are connected to the total heat exchanger, which is used to perform a total heat exchange between the fresh air and the waste exhaust air. This application utilizes the total heat exchanger to recover cooling or heat from the waste exhaust air, thereby increasing energy savings.

[0004] In the above solution, a total heat exchanger is used to realize heat exchange between fresh air and waste exhaust air. Although some heat can be recovered, it still has the following defects:

[0005] (1) The heat exchange core of the full heat exchanger has the defects of large resistance, easy to get dirty and blocked, and difficult to clean.

[0006] (2) The total heat exchanger is large in size and occupies a large internal space of the air-conditioning unit.

[0007] (3) After the exhaust air exchanges heat with the fresh air, it is directly discharged outside the vehicle, resulting in a low exhaust gas utilization rate. Utility Model Content

[0008] The main technical problem solved by the utility model is to provide an air-conditioning unit with a heat recovery function which has a simple structure, a small size and is easy to clean.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] An air-conditioning unit with a heat recovery function includes a shell, in which a fresh air chamber, a waste exhaust chamber, an air supply chamber, a return air chamber and a condensing chamber are separated by partitions. A waste exhaust fan is installed in the waste exhaust chamber, and a waste exhaust inlet and a waste exhaust outlet are provided on the shell corresponding to the waste exhaust chamber. A fresh air inlet is opened on the shell corresponding to the fresh air chamber, and heat pipe heat exchangers are installed corresponding to the fresh air chamber and the waste exhaust chamber. The fresh air and waste exhaust air exchange heat with the condensing end and evaporating end of the heat pipe heat exchanger respectively.

[0011] Further, a partial condenser is placed in the flow path of the waste exhaust air.

[0012] Furthermore, the condenser is placed on the exhaust side of the heat pipe heat exchanger, and the waste exhaust air exchanges heat with the heat pipe heat exchanger and then exchanges heat with the condenser for the second time.

[0013] Furthermore, a partition used to separate the waste discharge chamber and the condensation chamber divides the condenser into two sections, namely the first section and the second section. The first section condenser close to one end of the waste discharge chamber is placed in the waste discharge chamber, and a waste discharge outlet is set on the shell corresponding to the first section condenser.

[0014] Furthermore, the waste exhaust chamber and the fresh air chamber are located between the return air chamber and the condensation chamber, and the fresh air chamber is arranged on one side or both sides of the waste exhaust chamber.

[0015] Furthermore, the heat pipe heat exchanger is placed obliquely in the shell; or, the heat pipe heat exchanger is installed in the shell in an "I" shape and is arranged parallel to the corresponding fresh air inlet on the shell.

[0016] Furthermore, the two inclined heat pipe heat exchangers are arranged in a V-shaped or "eight"-shaped structure in the shell as a whole.

[0017] Furthermore, a waste discharge cavity is separated by a partition at the angle between the two heat pipe heat exchangers arranged in a V shape or an "eight" shape.

[0018] Furthermore, the air supply chamber is arranged at one end of the shell, an evaporator is installed on the partition between the air supply chamber and the return air chamber, and the air supply port is arranged on the end plate or the bottom plate of the shell.

[0019] In summary, the air conditioning unit with heat recovery function provided by the present invention has the following advantages compared with the prior art:

[0020] (1) The utility model utilizes a heat pipe heat exchanger to exchange heat between fresh air and waste exhaust air, which can make the heat exchange structure of the fresh air and waste exhaust air simpler and smaller in size, thereby reducing the space occupied in the air-conditioning unit. While ensuring the heat exchange effect, it is beneficial to reduce the size of the air-conditioning unit and reduce costs.

[0021] (2) The utility model adopts a heat pipe heat exchanger to exchange heat between fresh air and waste exhaust air, which is also beneficial to the daily maintenance and cleaning of the heat exchanger and improves the heat exchange efficiency.

[0022] (3) The utility model arranges part of the condenser on the flow path of the waste exhaust air, so that the waste exhaust air can undergo two heat exchanges with the heat pipe heat exchanger and the condenser during the discharge process, which not only reduces the cooling and heating loads of the fresh air, but also greatly improves the utilization rate of the waste exhaust air.

[0023] (4) The utility model utilizes waste exhaust air to perform secondary heat exchange with the condenser, which is also beneficial to reducing the heat exchange amount of the entire condenser, reducing the power of the condensing fan, reducing the requirements for the condensing fan air volume, and thus reducing the selection of the condensing fan and reducing the investment in the initial air conditioning unit.

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0026] In the attached figure:

[0027] Figure 1 This is a schematic diagram of the internal structure of the first embodiment of the air-conditioning unit of the utility model;

[0028] Figure 2 This is a flow diagram of the heat pipe heat exchanger during refrigeration of the utility model;

[0029] Figure 3 It is the flow direction of the heat pipe heat exchanger during heating of the utility model;

[0030] Figure 4 This is a schematic diagram of the internal structure of the second embodiment of the air-conditioning unit of the present utility model.

[0031] In the picture:

[0032] Shell 1, side panel 1a, end panel 1b, fresh air chamber 2, exhaust chamber 3, supply air chamber 4, return air chamber 5, condensing chamber 6, evaporator 7, supply air fan 8, condenser 9, first-stage condenser 91, second-stage condenser 92, condensing fan 10, fresh air inlet 11, return air outlet 12, exhaust fan 13, heat pipe heat exchanger 14, first partition 15, second partition 16, third partition 17, fourth partition 18.

[0033] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0037] Example 1:

[0038] like Figure 1 As shown, the utility model provides an air conditioning unit with heat recovery function, including a shell 1, in which a partition is used to separate a fresh air chamber 2, a waste exhaust chamber 3, an air supply chamber 4, a return air chamber 5 and a condensation chamber 6.

[0039] In this embodiment, an evaporator 7 and a blower 8 are installed in the air supply chamber 4. An air supply port (not shown in the figure) is provided on the housing 1 corresponding to the blower 8. The air supply port can be provided on the end plate 1b or on the bottom plate of the housing 1 as needed. The evaporator 7 is fixedly mounted on the fourth partition 18 between the air supply chamber 4 and the return air chamber 5. A condenser 9 and a condensation fan 10 are installed in the condensation chamber 6. A condensation air outlet (not shown in the figure) is provided on the top plate of the housing 1 corresponding to the condensation fan 10, and a condensation air inlet (not shown in the figure) is provided on the side plate 1a and / or the side top plate of the housing 1 corresponding to the condenser 9. Fresh air inlets 11 are provided on the side plates 1a of the housing 1 corresponding to the fresh air chamber 2, and a filter device and a fresh air valve (not shown in the figure) are installed at the fresh air inlet 11. A return air port 12 is provided on the bottom plate of the housing 1 corresponding to the return air chamber 5. An exhaust fan 13 is installed in the exhaust chamber 3, and an exhaust inlet and an exhaust outlet (not shown in the figure) are provided on the housing 1 corresponding to the exhaust chamber 3.

[0040] In this embodiment, the air supply chamber 4, return air chamber 5, and condensation chamber 6 are preferably arranged in sequence along the length of the housing 1. The fresh air chamber 2 and the exhaust chamber 3 are arranged between the return air chamber 5 and the condensation chamber 6. Furthermore, fresh air chambers 2 are provided on either side of the exhaust chamber 3 in the width direction of the housing 1, corresponding to the fresh air inlets 11 provided on the side panels 1a of the housing 1. This makes the overall structure of the air conditioning unit more compact, reduces the size of the air conditioning unit, and reduces the cost of the air conditioning unit. Of course, depending on the structure of the air conditioning unit, a fresh air chamber 2 can also be provided on either side of the exhaust chamber 3.

[0041] In this embodiment, heat pipe heat exchangers 14 are installed corresponding to the fresh air chamber 2 and the exhaust air chamber 3. The fresh air and exhaust air exchange heat with the condensing end and evaporating end of the heat pipe heat exchanger 14, respectively. Two heat pipe heat exchangers 14 are installed in the housing 1 to correspond to the two fresh air chambers 2. The exhaust air is drawn into a single exhaust chamber 3 and simultaneously exchanges heat with both heat pipe heat exchangers 14.

[0042] like Figure 2 and Figure 3 As shown, the heat pipe heat exchanger 14 is driven by temperature differences, using this difference as a power source to promote heat transfer. As long as there is a temperature difference between the fresh air and the exhaust air, heat can be exchanged between the two. Its operating principle is that one end of the heat pipe (the evaporation end) contacts the heat source, and the working fluid inside absorbs heat and evaporates. The vapor then flows to the other end (the condensation end), where it releases heat and condenses into liquid. The liquid then returns to the evaporation end through capillary action, forming a continuous cycle.

[0043] Among them, such as Figure 2 As shown in , it is the air flow diagram during cooling, at this time the fresh air temperature To is greater than the exhaust air temperature Ti; Figure 3The figure shows the air flow during heating, when the fresh air temperature To is lower than the exhaust air temperature Ti. The working medium in the heat pipe heat exchanger 14 flows in opposite directions during both processes. Therefore, whether in summer, when the fresh air temperature To is higher than the exhaust air temperature Ti, or in winter, when the fresh air temperature To is lower than the exhaust air temperature Ti, the fresh air and exhaust air will undergo heat exchange within the heat pipe heat exchanger 14. The heat exchanged fresh air is then mixed with the return air and, after heat exchange in the evaporator 7, delivered to the vehicle interior. This reduces the cooling and heating loads of the air conditioning unit and enables heat recovery from the exhaust air.

[0044] In this embodiment, the heat pipe heat exchanger 14 is used to exchange heat between fresh air and waste exhaust air, which can make the heat exchange structure of the fresh air and waste exhaust air simpler and smaller in size, reducing the occupied space in the air-conditioning unit. While ensuring the heat exchange effect, it is beneficial to reduce the size of the air-conditioning unit and reduce costs. At the same time, the use of the heat pipe heat exchanger 14 is also beneficial to the daily maintenance and cleaning of the heat exchanger, thereby improving the heat exchange efficiency.

[0045] In this embodiment, it is further preferred to place part of the condenser 9 on the flow path of the waste exhaust air, so that the waste exhaust air can undergo two heat exchanges with the heat pipe heat exchanger 14 and the condenser 9 during the discharge process, which not only reduces the cooling and heating loads of the fresh air, but also because the temperature of the waste exhaust air is lower than the temperature of the refrigerant in the condenser 9, part of the refrigerant in the condenser 9 exchanges heat with the waste exhaust air, which is beneficial to reduce the heat exchange amount of the entire condenser 9, reduce the power of the condensing fan 10, reduce the air volume requirements of the condensing fan 10, and thus reduce the selection of the condensing fan 10 and reduce the investment in the initial air-conditioning unit.

[0046] In this embodiment, condenser 9 is further preferably placed on the exhaust side of heat pipe heat exchanger 14. After the exhaust air exchanges heat with heat pipe heat exchanger 14, it undergoes a secondary heat exchange with condenser 9, achieving secondary heat recovery of the exhaust air. This can be combined with the existing layout of condenser 9 in air conditioning units, making the air conditioning unit layout more compact and reducing its volume. It is also convenient for retrofitting existing air conditioning units, reducing modification costs.

[0047] In this embodiment, the exhaust chamber 3 and the condensing chamber 6 are separated by a first partition 15. The first partition 15 is positioned in the middle of the condenser 9, dividing the condenser 9 into two sections, namely the first section condenser 91 and the second section condenser 92. The first section condenser 91 and the second section condenser 92 both participate in the new refrigerant circulation. The first section condenser 91, located near one end of the exhaust chamber 3, is positioned within the exhaust chamber 3. The first section condenser 91 and the second section condenser 92 are separated by the first partition 15. A exhaust outlet is provided on the housing 1 corresponding to the first section condenser 91. The first section condenser 91 exchanges heat with the exhaust chamber, while the second section condenser 92 exchanges heat with the outside air under the action of the condensing fan 10.

[0048] Of course, the condensation air inlet corresponding to the first-stage condenser 91 may also be separated from the other condensation air inlets, and a section of the condensation air inlet corresponding to the first-stage condenser 91 may be used as a waste outlet.

[0049] In this embodiment, the heat pipe heat exchanger 14 is preferably placed obliquely within the housing 1. The two heat pipe heat exchangers 14 are arranged in a V-shaped structure within the housing 1. The two heat pipe heat exchangers 14 are connected together at one end. This ensures that all exhaust air passes through the heat pipe heat exchanger 14. This helps increase the heat exchange area between the heat pipe heat exchanger 14 and the fresh air and exhaust air, while also helping to reduce the space occupied by the heat pipe heat exchanger 14, further making the internal structure of the air conditioning unit more compact.

[0050] This embodiment also provides another implementation in which two angled heat pipe exchangers 14 can be arranged within the housing 1 in an overall "eight" shape. The adjacent ends of the two heat pipe exchangers 14 are not connected together, but rather have a certain gap. To ensure that all exhaust air passes through the heat pipe exchangers 14, a first partition 15 is installed close to the ends of the heat pipe exchangers 14.

[0051] For the inclined heat pipe heat exchanger 14, a second partition 16 is installed at one end of the fresh air inlet 11 and connected to the heat pipe heat exchanger 14. At the other end of the fresh air inlet 11, the heat pipe heat exchanger 14 is abutted against the side plate 1a of the shell 1 to form a fresh air cavity 2. The space on the other side of the second partition 16 is the waste exhaust cavity 3. More preferably, the end of the second partition 16 connected to the side plate 1a is connected to the end of the first section condenser 91, so that all waste exhaust air can be discharged after heat exchange with the first section condenser 9, thereby improving the utilization rate of the waste exhaust air. Of course, the heat pipe heat exchanger 14 may not be abutted against the side plate 1a of the shell 1, but the side plate 1a may be connected to the heat pipe heat exchanger 14 through another partition, and together with the second partition 16, form a fresh air cavity 2.

[0052] In this embodiment, a third partition 17 is preferably used to separate the exhaust cavity 3 at the angle between the two heat pipe heat exchangers 14 arranged in a V-shape or figure eight configuration. This facilitates a more compact structure within the air conditioning unit and reduces the space occupied by the exhaust cavity 3. Furthermore, the third partition 17 is preferably U-shaped to provide sufficient installation space for the exhaust fan 13.

[0053] like Figures 1 to 3 As shown, in this embodiment, the flow paths of fresh air and waste exhaust air are as follows:

[0054] Under the action of the blower 8, fresh air enters the fresh air chamber 2 from the fresh air inlets 11 on both sides. At the same time, the exhaust air enters the exhaust chamber 3 from the exhaust inlet under the action of the exhaust blower 13. The fresh air and the exhaust air exchange heat with the heat pipe heat exchanger 14 at the same time. During cooling, the fresh air releases heat to the exhaust air; during heating, the fresh air absorbs the heat of the exhaust air. After pre-cooling or preheating, the fresh air enters the return air chamber 5 and mixes with the return air. The mixed air passes through the evaporator 7 and exchanges heat with the evaporator 7. The air after heat exchange is sent into the car by the blower 8. At the same time, after passing through the heat pipe heat exchanger 14, the exhaust air further undergoes secondary heat exchange with the first section condenser 91. The exhaust air that has undergone secondary heat exchange is discharged to the outside from the exhaust outlet on the shell 1.

[0055] Example 2:

[0056] The difference from the first embodiment is that Figure 4 As shown, in this embodiment, the heat pipe heat exchanger 14 is installed in the shell 1 in an "I" shape and is arranged parallel to the corresponding fresh air inlet 11 on the shell 1.

[0057] The fresh air chamber 12 is enclosed by two second partitions 16, one end of each of which is connected to the side panel 1a and the other end to the heat pipe exchanger 14. The exhaust chamber 3 is separated by a third partition 17 and a first partition 15. The third partition 17 and the first partition 15 are parallel to each other. The two ends of the third partition 17 are connected to the two heat pipe exchangers 14, and the two ends of the first partition 15 are connected to the two condensers 9. The first partition 15 is connected to or abuts the other end of the heat pipe exchanger 14, ensuring that all exhaust air can pass through the heat pipe exchanger 14 and the first condenser 91.

[0058] The air conditioning unit provided by the utility model has the following advantages:

[0059] 1. The utility model uses a heat pipe heat exchanger to exchange heat between fresh air and waste exhaust air, which can make the heat exchange structure of the fresh air and waste exhaust air simpler and smaller in size, reducing the occupied space in the air-conditioning unit. While ensuring the heat exchange effect, it is beneficial to reduce the size of the air-conditioning unit and reduce costs.

[0060] 2. The utility model adopts a heat pipe heat exchanger to exchange heat between fresh air and waste exhaust air, which is also beneficial to the daily maintenance and cleaning of the heat exchanger and improves the heat exchange efficiency.

[0061] 3. The utility model arranges part of the condenser on the flow path of the waste exhaust air, so that the waste exhaust air can undergo two heat exchanges with the heat pipe heat exchanger and the condenser during the discharge process, which not only reduces the cooling and heating loads of the fresh air, but also greatly improves the utilization rate of the waste exhaust air.

[0062] 4. The utility model utilizes waste exhaust air to carry out secondary heat exchange with the condenser, which is also beneficial to reducing the heat exchange amount of the entire condenser, reducing the power of the condensing fan, reducing the requirements for the condensing fan air volume, and thus reducing the selection of the condensing fan and reducing the investment in the initial air conditioning unit.

[0063] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An air conditioning unit with heat recovery function, comprising a housing, characterized in that: A partition is used to separate a fresh air chamber, a waste exhaust chamber, an air supply chamber, a return air chamber and a condensing chamber in the shell. A waste exhaust fan is installed in the waste exhaust chamber. A waste exhaust inlet and a waste exhaust outlet are provided on the shell corresponding to the waste exhaust chamber. A fresh air inlet is opened on the shell corresponding to the fresh air chamber. Heat pipe heat exchangers are installed corresponding to the fresh air chamber and the waste exhaust chamber. The fresh air and waste exhaust air exchange heat with the condensing end and evaporating end of the heat pipe heat exchanger respectively.

2. The air conditioning unit with heat recovery function according to claim 1, characterized in that: A partial condenser is placed in the flow path of the waste exhaust air.

3. The air conditioning unit with heat recovery function according to claim 2, characterized in that: The condenser is placed on the exhaust side of the heat pipe heat exchanger, and the waste exhaust air exchanges heat with the heat pipe heat exchanger and then performs secondary heat exchange with the condenser.

4. The air conditioning unit with heat recovery function according to claim 3, characterized in that: The partition used to separate the waste discharge chamber and the condensation chamber divides the condenser into two sections, namely the first section and the second section. The first section condenser close to one end of the waste discharge chamber is placed in the waste discharge chamber, and a waste discharge outlet is set on the shell corresponding to the first section condenser.

5. The air conditioning unit with heat recovery function according to claim 1, characterized in that: The waste exhaust chamber and the fresh air chamber are located between the return air chamber and the condensation chamber, and the fresh air chamber is arranged on one side or both sides of the waste exhaust chamber.

6. The air conditioning unit with heat recovery function according to claim 5, characterized in that: The heat pipe heat exchanger is placed obliquely in the shell; or, the heat pipe heat exchanger is installed in the shell in an "I" shape and is arranged parallel to the corresponding fresh air inlet on the shell.

7. The air conditioning unit with heat recovery function according to claim 6, characterized in that: The two inclined heat pipe heat exchangers are arranged in a V-shaped or "eight"-shaped structure in the shell as a whole.

8. The air conditioning unit with heat recovery function according to claim 7, characterized in that: A waste discharge cavity is separated by a partition at the angle between the two heat pipe heat exchangers arranged in a V shape or an "eight" shape.

9. The air conditioning unit with heat recovery function according to any one of claims 1 to 8, characterized in that: The air supply chamber is arranged at one end of the shell, an evaporator is installed on a partition between the air supply chamber and the return air chamber, and an air supply port is arranged on an end plate or a bottom plate of the shell.

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