CN219389986U - New fan - Google Patents

Abstract

The utility model discloses a new fan, comprising: the shell comprises a heat-insulating shell, wherein a pipeline cavity and a working cavity which are isolated are arranged in the heat-insulating shell; the heat exchanger is arranged in the working cavity; the water inlet pipe and the water outlet pipe are both arranged in the pipeline cavity, one end of each of the water inlet pipe and the water outlet pipe extends into the working cavity to be connected with the heat exchanger, and the other end of each of the water inlet pipe and the water outlet pipe extends out of the heat insulation shell; thereby realizing the isolation of the water inlet pipe and the water outlet pipe from the fresh air flowing in the working cavity through the cavity wall of the pipeline cavity. The wall of the pipeline cavity is used for separating the water inlet pipe from the water outlet pipe from flowing fresh air, so that the flowing fresh air can be prevented from forming condensation on the walls of the water inlet pipe and the water outlet pipe, the problem of water accumulation and water leakage in the heat preservation shell is further avoided, the water inlet pipe and the water outlet pipe can be preserved, and heat or cold loss is reduced.

Description

New fan

Technical Field

The application relates to the technical field of air conditioners, in particular to a fresh air fan.

Background

In the air conditioning application technology, besides performing temperature and humidity regulation treatment on indoor air, outdoor fresh air and indoor polluted air are required to be replaced continuously, so that people waiting for a long time in the room can breathe the fresh air, and a new fan for continuously conveying new air into the room is generated. The inside of part of the fresh air blower is provided with a water-cooled heat exchanger for realizing the functions of cooling, dehumidifying and heating, the water-cooled heat exchanger is connected with a water pipe of an external heat pump through a pipeline, and when cold water is introduced into the water-cooled heat exchanger by the heat pump, the fresh air is cooled and dehumidified after passing through the surface of the heat exchanger; when the heat pump is used for introducing hot water into the water-cooled heat exchanger, the fresh air reaches the heating effect after passing through the surface of the heat exchanger. However, the existing fresh air fan has the following problems: when low-temperature water is introduced, the temperature of a pipeline in the case is low, and condensation is formed on the surface of the pipeline when fresh air blows across the surface of the pipeline, so that the problem of water accumulation and water leakage in the case is caused.

Disclosure of Invention

The aim of the embodiment of the utility model is that: the utility model provides a new fan, it can solve the pipeline surface of prior art new fan and form the condensation easily, and then the problem that the quick-witted incasement ponding that leads to leaks.

In order to achieve the above purpose, the present application adopts the following technical scheme:

a fresh air fan comprising:

the shell comprises a heat-insulating shell, wherein a pipeline cavity and a working cavity which are isolated are arranged in the heat-insulating shell;

the heat exchanger is arranged in the working cavity;

the water inlet pipe and the water outlet pipe are both arranged in the pipeline cavity, one end of each of the water inlet pipe and the water outlet pipe extends into the working cavity to be connected with the heat exchanger, and the other end of each of the water inlet pipe and the water outlet pipe extends out of the heat insulation shell; thereby realizing the isolation of the water inlet pipe and the water outlet pipe from the fresh air flowing in the working cavity through the cavity wall of the pipeline cavity.

Optionally, the heat preservation shell includes heat preservation shell body and pipeline cover, through with the pipeline cover install in the heat preservation shell is internal, realize in the pipeline cover with form between the heat preservation shell body the pipeline chamber.

Optionally, the pipeline cover has the pipeline groove that is used for holding the inlet tube with the outlet pipe, the lateral part in pipeline groove is equipped with first breach and second breach, the inlet tube with the outlet pipe passes first breach in order to extend to in the working chamber, pass the second breach in order to extend to outside the heat preservation shell.

Optionally, the inner wall of the heat preservation shell body is provided with an embedded groove corresponding to the installation position of the pipeline cover, the embedded groove is matched with the edge of the pipeline cover, and the edge of the pipeline cover is embedded into the embedded groove.

Optionally, an upper partition plate is arranged in the working cavity, an air inlet chamber and a processing chamber are respectively formed up and down by the upper partition plate, and the heat exchanger is installed in the processing chamber.

Optionally, the pipeline cover is installed in the processing chamber, the second notch is located at the top of the pipeline cover, and the top of the pipeline cover abuts against the upper partition plate; the outer wall of the heat preservation shell body corresponds to the area above the second notch and is provided with an avoidance groove, and the water inlet pipe and the water outlet pipe penetrate through the avoidance groove from bottom to top, so that the water inlet pipe and the water outlet pipe are led out from the top of the shell.

Optionally, the top of heat preservation shell body is located dodge groove department is provided with mouth of a river fixed cover, mouth of a river fixed cover be equipped with respectively with the inlet tube with the fixed orifices that the outlet pipe corresponds, the inlet tube with the outlet pipe passes respectively the fixed orifices is passed, through the mouth of a river fixed cover is fixed the inlet tube with the outlet pipe.

Optionally, a water inlet main pipe and a water outlet main pipe are arranged on one side, close to the inner wall of the heat insulation shell, of the heat exchanger, the water inlet pipe is connected with the water inlet main pipe, and the water outlet pipe is connected with the water outlet main pipe.

Optionally, the water inlet pipe comprises a water inlet straight pipe and a water inlet switching bent pipe, the water outlet pipe comprises a water outlet straight pipe and a water outlet switching bent pipe, one end of the water inlet switching bent pipe is connected with the water inlet straight pipe in the pipeline cavity, and the other end of the water inlet switching bent pipe is connected with the water inlet main pipe in the working cavity; one end of the water outlet transfer elbow is connected with the water outlet straight pipe in the pipeline cavity, and the other end of the water outlet transfer elbow is connected with the water outlet main pipe in the working cavity.

Optionally, the casing further comprises a sheet metal shell covered outside the heat insulation shell.

The beneficial effects of this application are: the utility model provides a fresh air machine, wherein a heat preservation shell is arranged in a machine shell, a pipeline cavity and a working cavity which are isolated are arranged in the heat preservation shell, a heat exchanger is arranged in the working cavity, a water inlet pipe and a water outlet pipe for providing water inlet and outlet for the heat exchanger are both arranged in the pipeline cavity, the pipeline cavity is utilized to separate the water inlet pipe and the water outlet pipe from flowing fresh air, the flowing fresh air can be prevented from forming condensation on the walls of the water inlet pipe and the water outlet pipe, the problem of water accumulation and water leakage in the heat preservation shell is further avoided, meanwhile, the water inlet pipe and the water outlet pipe can be insulated, and heat or cold loss is reduced.

Drawings

The present application is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a fresh air machine according to an embodiment of the present application;

fig. 2 is a schematic diagram of an internal structure of the fresh air machine according to an embodiment of the present application;

FIG. 3 is a schematic view of the structure of FIG. 2 with the pipeline cover hidden;

FIG. 4 is an exploded view of a housing according to an embodiment of the present application;

fig. 5 is a schematic view of the back structure of the heat insulation shell according to the embodiment of the application;

FIG. 6 is a schematic view of a heat exchanger according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a pipeline cover according to an embodiment of the present application.

In the figure:

100. a housing; 1. a thermal insulation shell; 11. a working chamber; 111. an air inlet chamber; 112. a processing chamber; 113. an air outlet chamber; 12. an upper partition plate; 13. a lower partition plate; 14. a fitting groove; 15. an avoidance groove; 2. a sheet metal housing; 3. a heat exchanger; 31. a water inlet main pipe; 32. a water outlet dry pipe; 33. a water receiving tray; 4. a water inlet pipe; 41. a water inlet straight pipe; 42. a water inlet switching elbow; 5. a water outlet pipe; 51. a straight water outlet pipe; 52. a water outlet transfer elbow; 6. a pipeline cover; 61. a pipe line groove; 62. a first notch; 63. a second notch; 7. and a water gap fixing cover.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present application more clear, the technical solutions of the embodiments of the present application are described in further detail below, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, unless explicitly stated and limited otherwise, the terms "connected," "secured" and "fixed" are to be construed broadly, as for example, they may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1-7, the present embodiment provides a fresh air fan, including:

the machine shell 100 comprises a heat preservation shell 1, wherein a pipeline cavity and a working cavity 11 which are isolated are arranged in the heat preservation shell 1;

a heat exchanger 3 disposed in the working chamber 11;

the water inlet pipe 4 and the water outlet pipe 5 are arranged in the pipeline cavity, one end of each of the water inlet pipe 4 and the water outlet pipe 5 extends into the working cavity 11 to be connected with the heat exchanger 3, and the other end extends out of the heat insulation shell 1; thereby realizing the isolation of the water inlet pipe 4 and the water outlet pipe 5 from the fresh air flowing in the working cavity 11 through the cavity wall of the pipeline cavity.

The working cavity 11 formed in the heat-insulating shell 1 is used for processing fresh air, the pipeline cavity is used for laying a pipeline, the heat exchanger 3 is arranged in the working cavity 11, and cooling, dehumidifying or heating treatment can be performed on the fresh air passing through. As a preferred selection mode, the heat preservation shell 1 is made of EPP material, has the advantages of good strength, good heat preservation performance and the like, can provide reliable support for internal devices, can play a role in heat preservation and heat insulation, avoids the loss of internal cold or heat, and avoids condensation on the surfaces of the water inlet pipe 4 and the water outlet pipe 5.

Based on the fresh air machine of this embodiment, heat preservation shell 1 has been set up in casing 100, isolated pipeline chamber and working chamber 11 have been set up in heat preservation shell 1, heat exchanger 3 sets up in working chamber 11, be used for providing inlet tube 4 and outlet pipe 5 of water for heat exchanger 3 all set up in the pipeline chamber, utilize the chamber wall in pipeline chamber to separate inlet tube 4 and outlet pipe 5 with the new trend of flowing, can avoid the new trend of flowing to form the condensation in inlet tube 4 and outlet pipe 5 pipe wall, and then avoid producing the problem that ponding leaked in the heat preservation shell 1, can keep warm inlet tube 4 and outlet pipe 5 again simultaneously, reduce the loss of heat or cold volume.

Regarding the arrangement of the pipeline cavity, as an alternative embodiment, the heat-insulating shell 1 includes a heat-insulating shell body and a pipeline cover 6, and the pipeline cavity is formed between the pipeline cover 6 and the heat-insulating shell body by installing the pipeline cover 6 in the heat-insulating shell body.

Specifically, in this mode, pipeline cover 6 is detachable setting in the heat preservation casing body, when the unit assembly, can be earlier with inlet tube 4 and outlet pipe 5 connection laid, later install pipeline cover 6, buries inlet tube 4 and outlet pipe 5 in pipeline cover 6, and then realizes the separation to inlet tube 4 and outlet pipe 5. The structure of the heat preservation shell body and the pipeline cover 6 which are assembled in a split mode facilitates the installation and arrangement of pipelines on the aspect that the pipeline isolation requirement is met.

In some embodiments, the pipe cover 6 has a pipe groove 61 for accommodating the water inlet pipe 4 and the water outlet pipe 5, a first notch 62 and a second notch 63 are provided at a side portion of the pipe groove 61, and the water inlet pipe 4 and the water outlet pipe 5 pass through the first notch 62 to extend into the working chamber 11, and pass through the second notch 63 to extend out of the heat insulation case 1.

The pipeline groove 61 is formed on the pipeline cover 6 and used for accommodating the water inlet pipe 4 and the water outlet pipe 5, and the position of the inner wall of the heat preservation shell body corresponding to the pipeline cavity is not required to be provided with a groove, so that the structure of the heat preservation shell body is simplified, and the heat preservation shell body is convenient to form.

Of course, as other embodiments, the pipeline groove 61 may be disposed at a position corresponding to the pipeline cavity on the inner wall of the heat insulation shell body to accommodate the water inlet pipe 4 and the water outlet pipe 5.

Referring to fig. 4, in some embodiments, an inner wall of the heat insulation housing body is provided with a fitting groove 14 corresponding to the installation position of the pipe cover 6, the fitting groove 14 is matched with the edge of the pipe cover 6, and the edge of the pipe cover 6 is fitted into the fitting groove 14.

The inner wall of the heat preservation shell body is provided with the embedded groove 14, when the pipeline cover 6 is installed, the edge of the heat preservation shell body is only required to be aligned with the embedded groove 14 and then pressed in, the embedded groove 14 is convenient for rapid alignment installation of the pipeline cover 6, meanwhile, the pipeline cover 6 is fixed by using the clamping effect of the embedded groove 14, and reliable installation of the pipeline cover 6 is realized. To further enhance the reliability of the tube housing 6, in some of these embodiments, an adhesive is provided between the tube housing 6 and the wall of the mating groove 14 for adhesion.

Regarding the internal structure of the heat insulation shell 1, in some embodiments, an upper partition plate 12 is disposed in the working chamber 11, the upper partition plate 12 forms an air inlet chamber 111 and a processing chamber 112 up and down, and the heat exchanger 3 is installed in the processing chamber 112.

Wherein, can also set up the wet curtain that is used for filterable filter and is used for the humidification in the treatment chamber 112, set up upper and lower divided air inlet room 111 and treatment chamber 112 in heat preservation shell 1, can be provided with a plurality of air intakes in the lateral wall of air inlet room 111, the air intake connection air-supply line of easy to assemble is freely selected according to the installation environment during the installation, and other unused air intakes adopt the apron to seal can, so this structure is convenient for the installation of unit.

Further, a lower partition plate 13 is further arranged at the lower side of the processing chamber 112 in the heat preservation shell 1, an air outlet chamber 113 is formed at the lower side of the lower partition plate 13, an air supply fan is arranged at the bottom of the air outlet chamber 113, fresh air enters the air inlet chamber 111 from an air inlet during working, then enters the processing chamber 112 for processing such as filtration, temperature adjustment and humidity adjustment, and then passes through the air outlet chamber 113 and is sent out by the air supply fan.

In some installation scenarios, the inlet pipe 4 and the outlet pipe 5 cannot be accessed from the sides of the enclosure 100 because the sides of the fresh air blower are covered by walls or other obstacles, and at this time, it is considered that the pipeline is introduced from the top of the enclosure 100.

In order to meet the requirement of a top access line, in some embodiments, the line cover 6 is installed in the process chamber 112, the second notch 63 is located at the top of the line cover 6, and the top of the line cover 6 abuts the upper partition 12; the outer wall of the heat preservation shell body is provided with an avoidance groove 15 corresponding to the area above the second notch 63, and the water inlet pipe 4 and the water outlet pipe 5 penetrate through the avoidance groove 15 from bottom to top, so that the water inlet pipe 4 and the water outlet pipe 5 are led out from the top of the shell 100.

The avoidance groove 15 is formed in the upper side of the heat preservation shell body corresponding to the pipeline cover 6 in the mode, and the water inlet pipe 4 and the water outlet pipe 5 directly extend from the avoidance groove 15 to the outside of the heat preservation shell, so that punching on the upper partition plate 12 is avoided, and the heat preservation shell body is convenient to process and mold; the pipeline cover 6 is independently arranged in the processing chamber 112, so that the pipeline cover 6 can be conveniently arranged, and the installation difficulty is reduced.

Further, the top of the heat preservation shell body is provided with a water gap fixing cover 7 at the position of the avoidance groove 15, the water gap fixing cover 7 is provided with fixing holes corresponding to the water inlet pipe 4 and the water outlet pipe 5 respectively, the water inlet pipe 4 and the water outlet pipe 5 respectively penetrate through the fixing holes, and the water inlet pipe 4 and the water outlet pipe 5 are fixed through the water gap fixing cover 7.

Optionally, the fixed lid 7 of mouth of a river accessible screw locking is on the heat preservation shell body, utilizes the fixed lid 7 of mouth of a river to support spacing to inlet tube 4 and outlet pipe 5, improves the stability of inlet tube 4 and outlet pipe 5.

Regarding the arrangement of the heat exchanger 3, a water inlet main pipe 31 and a water outlet main pipe 32 are arranged on one side, close to the inner wall of the heat insulation shell 1, of the heat exchanger 3, the water inlet pipe 4 is connected with the water inlet main pipe 31, and the water outlet pipe 5 is connected with the water outlet main pipe 32.

The water inlet main pipe 31 and the water outlet main pipe 32 of the heat exchanger 3 are arranged on one side close to the inner wall of the heat preservation shell 1, the water inlet pipe 4 and the water outlet pipe 5 connected with the water inlet main pipe and the water outlet main pipe can be correspondingly arranged close to the inner wall of the heat preservation shell 1, the occupied space of the water inlet pipe 4 and the water outlet pipe 5 in the heat preservation shell 1 is reduced, and the compactness of the internal structure of the heat preservation shell 1 is improved; at the same time, the design and the installation of the pipeline cover 6 are convenient.

Referring to fig. 6, the water inlet pipe 4 includes a water inlet straight pipe 41 and a water inlet adapting bent pipe 42, the water outlet pipe 5 includes a water outlet straight pipe 51 and a water outlet adapting bent pipe 52, one end of the water inlet adapting bent pipe 42 is connected with the water inlet straight pipe 41 in the pipeline cavity, and the other end is connected with the water inlet main pipe 31 in the working cavity 11; one end of the water outlet transfer elbow 52 is connected with the water outlet straight pipe 51 in the pipeline cavity, and the other end is connected with the water outlet main pipe 32 in the working cavity 11.

Preferably, the water inlet transfer elbow pipe 42 and the water inlet main pipe 31 are of a structure which is welded integrally in advance, the water outlet transfer elbow pipe 52 and the water outlet main pipe 32 are of a structure which is welded integrally in advance, the water inlet straight pipe 41 and the water inlet transfer elbow pipe 42, the water outlet straight pipe 51 and the water outlet transfer elbow pipe 52 are respectively connected through threaded connectors, the heat exchanger 3 with the water inlet transfer elbow pipe 42 and the water outlet transfer elbow pipe 52 is installed in the treatment chamber 112 during installation, the water inlet straight pipe 41 and the water outlet straight pipe 51 penetrate from the top of the casing 100, and all pipelines are correspondingly connected through the connectors, so that the connectors of the pipelines of the structure deviate from the heat exchanger 3, and the disassembly and assembly operations are convenient.

In a further scheme, a water receiving tray 33 for collecting condensed water is arranged at the bottom of the heat exchanger 3, the water inlet transfer elbow pipe 42 and the water outlet transfer elbow pipe 52 correspond to the area above the water receiving tray 33, and even if condensed water is generated on the surface of the heat exchanger, the condensed water can be collected by the water receiving tray 33 after dripping downwards, so that the pipeline cover 6 does not need to cover the area above the water receiving tray 33 corresponding to the water inlet transfer elbow pipe 42 and the water outlet transfer elbow pipe 52.

Regarding the structure of the casing 100, preferably, the casing 100 further includes a sheet metal shell 2 covered outside the heat insulation shell 1.

The sheet metal shell 2 is arranged to protect the outer wall of the heat preservation shell 1 and optimize the appearance of the product.

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are merely for convenience of description and to simplify the operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principles of the present application are described above in connection with specific embodiments. These descriptions are provided only for the purpose of illustrating the principles of the present application and should not be construed as limiting the scope of the present application in any way. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification without undue burden from the present disclosure.

Claims (10)

1. A fresh air fan, comprising:

the shell (100) comprises a heat-insulating shell (1), wherein a pipeline cavity and a working cavity (11) which are isolated are arranged in the heat-insulating shell (1);

the heat exchanger (3) is arranged in the working cavity (11);

the water inlet pipe (4) and the water outlet pipe (5) are arranged in the pipeline cavity, one end of each of the water inlet pipe (4) and the water outlet pipe (5) extends into the working cavity (11) and is connected with the heat exchanger (3), and the other end of each of the water inlet pipe and the water outlet pipe extends out of the heat insulation shell (1); thereby realizing the isolation of the water inlet pipe (4) and the water outlet pipe (5) from the fresh air flowing in the working cavity (11) through the cavity wall of the pipeline cavity.

2. Fresh air machine according to claim 1, characterized in that the heat-insulating shell (1) comprises a heat-insulating shell body and a pipeline cover (6), and that the pipeline cavity is formed between the pipeline cover (6) and the heat-insulating shell body by installing the pipeline cover (6) in the heat-insulating shell body.

3. Fresh air machine according to claim 2, characterized in that the pipe cover (6) has a pipe groove (61) for receiving the water inlet pipe (4) and the water outlet pipe (5), the side of the pipe groove (61) being provided with a first gap (62) and a second gap (63), the water inlet pipe (4) and the water outlet pipe (5) passing through the first gap (62) to extend into the working chamber (11) and through the second gap (63) to extend out of the insulation shell (1).

4. A fresh air machine according to claim 3, wherein an embedding groove (14) is formed in the inner wall of the heat-insulating shell body corresponding to the installation position of the pipeline cover (6), the embedding groove (14) is matched with the edge of the pipeline cover (6), and the edge of the pipeline cover (6) is embedded into the embedding groove (14).

5. A fresh air machine according to claim 3, wherein an upper partition plate (12) is arranged in the working chamber (11), an air inlet chamber (111) and a treatment chamber (112) are respectively formed on the upper partition plate (12) and the lower partition plate, and the heat exchanger (3) is arranged in the treatment chamber (112).

6. A fresh air machine according to claim 5, wherein the duct cover (6) is mounted in the treatment chamber (112), the second gap (63) is located at the top of the duct cover (6), and the top of the duct cover (6) abuts the upper partition (12); the outer wall of the heat preservation shell body corresponds to the area above the second notch (63) is provided with an avoidance groove (15), and the water inlet pipe (4) and the water outlet pipe (5) penetrate through the avoidance groove (15) from bottom to top, so that the water inlet pipe (4) and the water outlet pipe (5) are led out from the top of the shell (100).

7. The fresh air machine according to claim 6, wherein a water gap fixing cover (7) is arranged at the position of the avoidance groove (15) at the top of the heat preservation shell body, fixing holes corresponding to the water inlet pipe (4) and the water outlet pipe (5) are respectively formed in the water gap fixing cover (7), and the water inlet pipe (4) and the water outlet pipe (5) respectively penetrate through the fixing holes, and the water inlet pipe (4) and the water outlet pipe (5) are fixed through the water gap fixing cover (7).

8. Fresh air machine according to claim 2, characterized in that the heat exchanger (3) is provided with a water inlet main pipe (31) and a water outlet main pipe (32) at one side close to the inner wall of the heat insulation shell (1), the water inlet pipe (4) is connected with the water inlet main pipe (31), and the water outlet pipe (5) is connected with the water outlet main pipe (32).

9. A fresh air machine according to claim 8, wherein the water inlet pipe (4) comprises a water inlet straight pipe (41) and a water inlet switching elbow pipe (42), the water outlet pipe (5) comprises a water outlet straight pipe (51) and a water outlet switching elbow pipe (52), one end of the water inlet switching elbow pipe (42) is connected with the water inlet straight pipe (41) in the pipeline cavity, and the other end is connected with the water inlet main pipe (31) in the working cavity (11); one end of the water outlet transfer elbow pipe (52) is connected with the water outlet straight pipe (51) in the pipeline cavity, and the other end of the water outlet transfer elbow pipe is connected with the water outlet main pipe (32) in the working cavity (11).

10. Fresh air machine according to claim 1, characterized in that the casing (100) further comprises a sheet metal shell (2) covering the heat-insulating shell (1).