Refrigeration unit internal unit, refrigeration unit, refrigerated truck and control method

Abstract

The present application relates to a refrigeration unit, a refrigeration unit, a refrigerated vehicle, and a control method. The refrigeration unit includes a mounting chassis; a water receiving pan rotatably coupled to the mounting chassis, the mounting chassis and the water receiving pan jointly defining a receiving chamber, the water receiving pan having a drain port and an air outlet connected to the receiving chamber, respectively, at both ends in a first direction; an evaporator housed in the receiving chamber; a water level detection module disposed in the receiving chamber and below the air outlet, for detecting the water level at one end of the receiving chamber where the air outlet is located; a drive assembly connected between the mounting chassis and the water receiving pan; the drive assembly being controllably operable to drive the water receiving pan to rotate relative to the mounting chassis about an axis perpendicular to the first direction according to the water level in the receiving chamber, thereby adjusting the height of the drain port. In the refrigeration unit, defrost water can be gathered to the drain port under the action of gravity and discharged promptly through the drain port, thereby preventing the defrost water from overflowing from the air outlet and affecting the cargo loaded in the vehicle compartment.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a refrigeration unit internal unit, a refrigeration unit, a refrigerated truck, and a control method. Background Art

[0002] A refrigerated truck refers to a closed van transport truck used to maintain the temperature of frozen or fresh goods. It is commonly used to transport frozen foods (refrigerated trucks), dairy products (dairy transport trucks), vegetables and fruits (fresh goods transport trucks), vaccines and medicines (vaccine transport trucks), etc.

[0003] The core component that keeps refrigerated trucks frozen is the refrigeration unit. Traditional refrigerated truck refrigeration units typically feature a split design with internal and external units. The internal unit's drain outlet is typically located at the front, while the air outlet is located at the rear. Typically, the internal unit's outer casing forms a defrost drain pan. To ensure smooth drainage of defrost water, the drain port is typically located at the lowest point of the pan.

[0004] However, the uncertainty of the driving road conditions of the refrigerated truck will cause great interference to the normal drainage of the drain outlet, especially when the refrigerated truck is driving uphill. The increased position of the drain outlet will cause the defrost water to be unable to be discharged normally and to collect in the water receiving tray. When the collection of defrost water reaches a certain level, the defrost water will easily overflow from the air outlet and affect the cooling effect of the refrigeration unit, and thus affect the quality of the goods. Summary of the Invention

[0005] In order to solve the problem that defrost water cannot be discharged when a refrigerated truck goes uphill, the present application provides a refrigeration unit internal unit, a refrigeration unit, a refrigerated truck and a control method. The refrigeration unit internal unit, the refrigeration unit, the refrigerated truck and the control method can achieve the technical effect of enabling the defrost water of the refrigerated truck to be discharged smoothly when going uphill.

[0006] According to one aspect of the present application, there is provided a refrigeration unit, comprising:

[0007] Install the chassis;

[0008] A water receiving tray is rotatably connected to the mounting base, the mounting base and the water receiving tray jointly define a receiving cavity, and the water receiving tray is provided with a drain port and an air outlet connected to the receiving cavity at two ends in a first direction respectively;

[0009] an evaporator, housed in the accommodating cavity;

[0010] a water level detection module, disposed in the accommodating cavity and below the air outlet, for obtaining the water level at one end of the accommodating cavity where the air outlet is disposed; and

[0011] A drive assembly connected between the mounting chassis and the water receiving tray;

[0012] The driving assembly can controllably drive the water receiving tray to rotate relative to the mounting base around an axis perpendicular to the first direction according to the water level in the accommodating chamber, so as to adjust the height of the drain outlet.

[0013] In one embodiment, one end of the water receiving tray provided with the air outlet is rotatably connected to the mounting chassis, and the driving assembly connects one end of the water receiving tray provided with the drain outlet and the mounting chassis.

[0014] In one embodiment, the internal unit of the refrigeration unit includes a hinge, and one end of the water receiving tray provided with the air outlet is rotatably connected to the mounting chassis through the hinge.

[0015] In one embodiment, the drive assembly includes:

[0016] A screw mechanism is mounted on the mounting chassis; and

[0017] A connecting rod has one end rotatably connected to the screw mechanism and the other end rotatably connected to the water receiving tray. The connecting rod can drive the water receiving tray to rotate under the drive of the screw mechanism.

[0018] In one embodiment, the refrigeration unit further includes a humidity detection module, which is installed in the accommodating cavity and disposed adjacent to the drain outlet.

[0019] In one embodiment, the refrigeration unit internal unit further includes a sealing member, which is provided on the mounting chassis and is used to seal the gap between the mounting chassis and the water receiving tray.

[0020] According to one aspect of the present application, a refrigeration unit is provided, comprising the above-mentioned refrigeration unit internal unit, the refrigeration unit further comprising a refrigeration unit external unit, the refrigeration unit internal unit and the refrigeration unit external unit being connected via a pipeline.

[0021] According to one aspect of the present application, a refrigerated vehicle is provided, comprising the above-mentioned refrigeration unit, wherein the refrigerated vehicle comprises a compartment, the internal unit of the refrigeration unit is arranged in the compartment, and the refrigeration unit is arranged outside the compartment;

[0022] In the forward direction of the refrigerated truck, the drain outlet of the internal unit of the refrigeration unit is located in front of the air outlet.

[0023] According to one aspect of the present application, a method for controlling an indoor unit of a refrigeration unit is provided, comprising the following steps:

[0024] Obtaining the real-time water level at one end of the accommodating chamber where the air outlet is located;

[0025] When it is determined that the real-time water level is higher than the first preset water level and the duration reaches the first preset duration, the water receiving tray is rotated to lower the height of the drain outlet.

[0026] In one embodiment, the following steps are also included:

[0027] Obtaining real-time humidity at the drain outlet;

[0028] When it is determined that the real-time humidity is greater than the preset humidity, the rotation of the water receiving tray is stopped and the real-time water level of the end of the accommodating chamber provided with the air outlet is continuously acquired;

[0029] When it is determined that the real-time water level is higher than a second preset water level and the duration reaches the second preset duration, and the real-time humidity at the drain outlet is lower than the preset humidity, rotating the water receiving tray to lower the height of the drain outlet;

[0030] Wherein, the second preset water level is lower than the first preset water level.

[0031] In one embodiment, the following steps are also included:

[0032] When it is determined that the real-time water level at one end of the accommodating chamber where the air outlet is provided is lower than the second preset water level and lasts for a third preset time, and at the same time, the real-time humidity at the drain outlet is lower than the preset humidity, the water receiving tray is rotated in the opposite direction to raise the height of the drain outlet.

[0033] In the aforementioned refrigeration unit, when the refrigerated truck is traveling uphill and the refrigeration unit is in defrost mode, the water level detection module can obtain the real-time water level at the end of the accommodating chamber where the air outlet is located. When the real-time water level at the end of the accommodating chamber where the air outlet is located is too high, indicating that the height of the drain outlet is too high, causing defrost water to collect at the end of the water receiving pan where the air outlet is located and unable to be discharged smoothly. Therefore, the drive assembly drives the water receiving pan to rotate relative to the mounting chassis to lower the height of the drain outlet. As a result, the defrost water can be collected at the drain outlet under the action of gravity and discharged promptly through the drain outlet, thereby preventing the defrost water from overflowing from the air outlet and affecting the cargo loaded in the vehicle compartment. At the same time, the basic structure of the refrigeration unit is not changed, thereby avoiding affecting the stability of the cooling capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a refrigerated truck according to an embodiment of the present application;

[0035] Figure 2 for Figure 1 The schematic diagram of the refrigerated truck shown is in an uphill state;

[0036] Figure 3 for Figure 1The schematic diagram of the refrigerated truck shown is in an uphill state and in a defrost mode;

[0037] Figure 4 This is a schematic structural diagram of an internal unit of a refrigeration unit of a refrigerated truck according to an embodiment of the present application;

[0038] Figure 5 This is a schematic structural diagram of a refrigeration unit of a refrigerated vehicle according to an embodiment of the present application when the internal unit is in defrost mode;

[0039] Figure 6 A control method for an indoor unit of a refrigeration unit according to an embodiment of the present application;

[0040] Description of Figure Numbers:

[0041] 100. Refrigerated truck; 20. Carriage; 40. Refrigeration unit; 41. Refrigeration unit internal unit; 411. Mounting chassis; 4112. Mounting block; 412. Drain tray; 4121. Drain outlet; 4123. Air outlet; 413. Evaporator; 414. Fan; 415. Water level detection module; 416. Drive assembly; 4161. Screw mechanism; 4163. Connecting rod; 417. Hinge; 418. Humidity detection module; 419. Seal; 43. Refrigeration unit external unit; 432. Electrical control box. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0045] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0048] See Figures 1 to 3 In one embodiment of the present application, a refrigerated truck 100 is provided, comprising a compartment 20 for loading goods. In order to refrigerate the interior of the compartment 20 to keep the goods frozen or to preserve the goods, the refrigerated truck 100 further comprises a refrigeration unit 40. The refrigeration unit 40 is a split design, comprising an internal refrigeration unit 41 installed in the compartment 20 and an external refrigeration unit 43 installed outside the compartment 20. The internal refrigeration unit 41 and the external refrigeration unit 43 are connected by a pipeline to realize the flow of refrigerant. The external refrigeration unit 43 is provided with an electric control box 432 (such as Figure 4 As shown), the electric control box 432 is in communication connection with the indoor unit 41 of the refrigeration unit, and is used to control the working status of the outdoor unit 43 of the refrigeration unit and the indoor unit 41 of the refrigeration unit.

[0049] See also Figure 4 and Figure 5 The refrigeration unit 41 includes a mounting chassis 411, a water tray 412, an evaporator 413, and a fan 414. The mounting chassis 411 is located within the vehicle compartment 20 and is fixed to the top of the vehicle compartment 20 via a mounting block 4112. The water tray 412 is coupled to one side of the mounting chassis 411 and defines a receiving chamber with the mounting chassis 411. The water tray 412 is provided with a drain port 4121 and an air outlet 4123, respectively, at both ends of the first direction, connecting the receiving chamber to the outside environment. The evaporator 413 is housed in the receiving chamber and is located at one end of the receiving chamber near the air outlet 4123. The fan 414 is mounted outside the water tray 412 and is located at one end of the water tray 412 near the drain port 4121. The first direction is the forward direction of the refrigerated truck 100, and in the forward direction of the refrigerated truck 100, the drain port 4121 is located in front of the air outlet 4123.

[0050] In this way, air in the vehicle compartment 20 can enter the accommodating chamber through the fan 414, exchange heat with the evaporator 413, and then flow out through the air outlet 4123. When the refrigeration unit 40 operates in the defrost mode, defrosted water falling from the evaporator 413 and other components falls onto the water receiving tray 412 and is then discharged from the accommodating chamber through the drain port 4121.

[0051] However, as described in the background art, when the refrigerated truck 100 is traveling uphill for a long period of time, the refrigeration unit 41 tilts backward, causing the drain outlet 4121 to rise and the air outlet 4123 to fall. This causes defrost water to collect in the water receiving pan 412 and prevent it from being properly drained through the drain outlet 4121. When the defrost water in the water receiving pan 412 accumulates to a certain level, it is likely to overflow from the air outlet 4123, affecting the quality of the cargo in the vehicle compartment 20.

[0052] In response to the above technical problems, the following two methods are currently commonly used. One is to increase the height of the baffle below the air outlet, but this will result in a reduction in the area of the air outlet 4123, making the cooling capacity of the refrigeration unit 40 unable to meet the standard; the other is to increase the height difference between the drain outlet 4121 and the air outlet 4123, but this method will cause the overall height of the internal unit 41 of the refrigeration unit to increase, thereby occupying too much internal space of the car 20 and reducing the transportation efficiency of the refrigerated truck 100.

[0053] In order to ensure the refrigeration capacity of the refrigeration unit 40 and the transportation efficiency of the refrigerated truck 100 while promptly draining the defrost water, the water receiving tray 412 in the present application is rotatably connected to the mounting chassis 411. The refrigeration unit 41 also includes a water level detection module 415 and a drive assembly 416. The water level detection module 415 is disposed within the accommodating chamber and below the air outlet 4123, and is used to detect the water level at the end of the accommodating chamber where the air outlet 4123 is located. The drive assembly 416 is connected between the mounting chassis 411 and the water receiving tray 412. The drive assembly 416 can be controlled to rotate the water receiving tray 412 relative to the mounting chassis 411 around an axis perpendicular to the first direction based on the water level at the end of the accommodating chamber where the air outlet 4123 is located, thereby adjusting the height of the drain outlet 4121.

[0054] Thus, when the refrigerated truck 100 is ascending an incline and the refrigeration unit 40 is in defrost mode, the water level detection module 415 can obtain the real-time water level at the end of the accommodating chamber where the air outlet 4123 is located. If the real-time water level at the end of the accommodating chamber where the air outlet 4123 is located is too high, it indicates that the height of the drain outlet 4121 is too high, causing the defrosted water to collect at the end of the water receiving pan 412 where the air outlet 4123 is located and unable to be discharged smoothly. Therefore, the drive assembly 416 drives the water receiving pan 412 to rotate relative to the mounting base 411 to lower the height of the drain outlet 4121. As a result, the defrosted water can be gathered at the drain outlet 4121 under the action of gravity and discharged promptly through the drain outlet 4121, thereby preventing the defrosted water from overflowing from the air outlet 4123 and affecting the cargo loaded in the vehicle compartment 20.

[0055] Specifically, to enable rotation of the water tray 412, the refrigeration unit 41 includes a hinge 417. The end of the water tray 412, which is provided with an air outlet 4123, is rotatably connected to the mounting base 411 via the hinge 417. The end of the water tray 412, which is provided with a drain outlet 4121, is connected to the mounting base 411 via a drive assembly 416. In this manner, the drive assembly 416 can drive the water tray 412 to rotate relative to the mounting base 411 in a direction perpendicular to the first direction, with the hinge 417 as the center of rotation. It will be appreciated that the refrigeration unit 40 can be rotatably connected to the mounting base 411 via other structures besides the hinge 417.

[0056] More specifically, in some embodiments, the drive assembly 416 includes a screw mechanism 4161 and a connecting rod 4163. One end of the screw mechanism 4161 is fixedly connected to the mounting base 411, and the other end of the screw mechanism 4161 extends vertically downward. One end of the connecting rod 4163 is rotatably coupled to the screw mechanism 4161, and the other end is rotatably connected to one end of the water receiving tray 412, where the drain outlet 4121 is located. Driven by the screw mechanism 4161, the connecting rod 4163 can rotate the water receiving tray 412.

[0057] In some embodiments, the refrigeration unit 41 further includes a humidity detection module 418, which is installed within the accommodating cavity and adjacent to the drain outlet 4121. The humidity detection module 418 is configured to detect the humidity at the drain outlet 4121 to determine whether defrost water is flowing out through the drain outlet 4121. When the humidity detected by the humidity detection module 418 is greater than a preset humidity, it is determined that defrost water is flowing out through the drain outlet 4121. When the humidity detected by the humidity detection module 418 is less than the preset humidity, it is determined that defrost water is not flowing out through the drain outlet 4121.

[0058] In some embodiments, the refrigeration unit 41 further includes a seal 419, which is disposed on the mounting chassis 411 and is used to close the gap between the mounting chassis 411 and the water collecting pan 412, thereby preventing airflow from leaking from the gap between the mounting chassis 411 and the water collecting pan 412 during the rotation of the fan 414.

[0059] The above-mentioned refrigeration unit 41, refrigeration unit 40 and refrigerated truck 100 adjust the angle of the water receiving tray 412 in real time according to the water level in the water receiving tray 412, which can prevent defrost water from overflowing from the air outlet 4123, and solve the problem of substandard cooling capacity and impact on cargo quality due to water at the air outlet 4123. At the same time, it will not change the basic structure of the refrigeration unit 41, and avoid affecting the stability of the cooling capacity.

[0060] Please combine Figure 6 As shown, the present application also provides a method for controlling the indoor unit 41 of a refrigeration unit, comprising the following steps:

[0061] S110: Acquire the real-time water level at one end of the accommodating chamber where the air outlet 4123 is provided.

[0062] Specifically, when the refrigerated truck 100 travels uphill for an extended period, the truck 100 tilts as a whole, raising the position of the drain outlet 4121 located in the forward direction and lowering the position of the drain outlet 4121 located in the rearward direction. When the refrigeration unit 40 is in defrost mode, defrost water will accumulate in the water receiving pan 412 and be unable to drain properly, as the drain outlet 4121 is not at the lowest position in the storage chamber. Therefore, when the refrigeration unit 40 is in defrost mode, the water level detection module 415, under the control of the electrical control box 432, obtains the real-time water level at the end of the storage chamber where the air outlet 4123 is located and transmits it to the electrical control box 432.

[0063] S120: When it is determined that the real-time water level is higher than the first preset water level and the duration reaches the first preset duration, the water receiving tray 412 is rotated to lower the height of the drain outlet 4121 in the vertical direction.

[0064] When the electrical control box 432 determines that the real-time water level L is higher than the first preset water level L1 and that the duration T of the water level higher than the first preset water level reaches the first preset duration T1, it indicates that there is a large amount of defrost water in the water receiving pan 412 and that it is likely to overflow from the air outlet 4123. Therefore, under the control of the electrical control box 432, the drive assembly 416 drives the water receiving pan 412 to rotate a certain angle to lower the height of the drain outlet 4121, thereby allowing the water in the water receiving pan 412 to flow out through the drain outlet 4121.

[0065] S130: Acquire the real-time humidity at the drain outlet 4121.

[0066] Specifically, when the driving component 416 drives the water receiving tray 412 to rotate under the control of the electrical control box 432 to change the angle of the water receiving tray 412, the humidity sensing unit obtains the real-time humidity at the drain outlet 4121 under the control of the electrical control box 432 and sends it to the electrical control box 432, thereby obtaining the drainage status of the drain outlet 4121.

[0067] S140: When it is determined that the real-time humidity is greater than the preset humidity, the rotation of the water receiving tray 412 is stopped and the real-time water level at the end of the accommodating cavity where the air outlet 4123 is located is continuously obtained.

[0068] Specifically, when the electrical control box 432 determines that the real-time humidity at the drain outlet 4121 is greater than the preset humidity, it indicates that the defrost water can be discharged normally through the drain outlet 4121 at this time, so the drive component 416 is controlled to stop running to save energy, and at the same time the water level detection module 415 is controlled to continue to obtain the real-time water level L at one end of the accommodating chamber where the air outlet 4123 is provided.

[0069] S150: When the real-time water level is higher than the second preset water level and the duration reaches the second preset duration, and the real-time humidity at the drain outlet 4121 is lower than the preset humidity, the water receiving tray 412 is rotated to further lower the height of the drain outlet 4121.

[0070] Specifically, the second preset water level L2 is lower than the first preset water level L1. When the electrical control box 432 determines that the real-time water level L in the accommodating chamber is higher than the second preset water level L2 and the duration T of the water level higher than the second preset water level L2 reaches the second preset duration T2, and at the same time, the real-time humidity at the drain outlet 4121 obtained by the humidity detection module 418 is lower than the preset humidity, it indicates that defrost water still exists in the water receiving tray 412, but the height of the drain outlet 4121 is still too high to be drained through the drain outlet 4121. Therefore, the electrical control box 432 controls the driving assembly 416 to drive the water receiving tray 412 to continue rotating, further lowering the height of the drain outlet 4121, so that the defrost water in the water receiving tray 412 can continue to be drained through the drain outlet 4121.

[0071] S160: When the real-time water level at one end of the accommodating chamber where the air outlet 4123 is provided is lower than the second preset water level and lasts for a third preset time, and the real-time humidity at the drain outlet 4121 is lower than the preset humidity, the water receiving tray 412 is rotated in the opposite direction to restore the height of the drain outlet 4121 to its initial height.

[0072] Specifically, when the electrical control box 432 determines that the real-time water level L in the accommodating chamber is less than the second preset water level L2 and the duration of being less than the second preset water level L2 reaches the third preset duration L3, and at the same time, the real-time humidity at the drain outlet 4121 obtained by the humidity detection module 418 is less than the preset humidity, it indicates that the defrost water in the water receiving tray 412 has been basically discharged, so the electrical control box 432 controls the driving component 416 to drive the water receiving tray 412 to rotate in the opposite direction, so that the height of the drain outlet 4121 is restored to the initial height.

[0073] In some embodiments, the first preset time length L1, the second preset time length L2, and the third preset time length L3 are all 5 seconds. It is understood that the specific lengths of the first preset time length L1, the second preset time length L2, and the third preset time length L3 are not limited and can be set as needed.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A refrigeration unit, characterized in that: include: Install chassis (411); A water receiving tray (412) is rotatably connected to the mounting base (411), the mounting base (411) and the water receiving tray (412) jointly define a receiving cavity, and the water receiving tray (412) is provided with a drain outlet (4121) and an air outlet (4123) in communication with the receiving cavity at both ends in a first direction. an evaporator (413), housed in the accommodating chamber; a water level detection module (415), disposed in the accommodating cavity and below the air outlet (4123), for acquiring the water level at one end of the accommodating cavity where the air outlet (4123) is disposed; and A drive assembly (416) connected between the mounting chassis (411) and the water receiving tray (412); The driving assembly (416) can be controlled to drive the water receiving tray (412) to rotate relative to the mounting base (411) around an axis perpendicular to the first direction according to the water level at one end of the accommodating chamber where the air outlet (4123) is provided, so as to adjust the height of the drain outlet (4121).

2. The refrigeration unit according to claim 1, characterized in that: One end of the water receiving tray (412) provided with the air outlet (4123) is rotatably connected to the mounting chassis (411), and the driving assembly (416) connects one end of the water receiving tray (412) provided with the drain outlet (4121) and the mounting chassis (411).

3. The refrigeration unit according to claim 2, characterized in that: The internal unit of the refrigeration unit includes a hinge (417), and one end of the water receiving tray (412) provided with the air outlet (4123) is rotatably connected to the mounting chassis (411) through the hinge (417).

4. The refrigeration unit according to claim 2, characterized in that: The drive assembly (416) includes: A screw mechanism (4161) is mounted on the mounting chassis (411); and The connecting rod (4163) has one end rotatably connected to the screw mechanism (4161) and the other end rotatably connected to the water receiving tray (412). The connecting rod (4163) can drive the water receiving tray (412) to rotate under the drive of the screw mechanism (4161).

5. The refrigeration unit according to claim 1, characterized in that: The refrigeration unit further includes a humidity detection module (418), which is installed in the accommodating cavity and is arranged adjacent to the drain outlet (4121).

6. The refrigeration unit according to claim 1, characterized in that: The refrigeration unit internal unit further includes a sealing member (419), which is provided on the mounting chassis (411) and is used to seal the gap between the mounting chassis (411) and the water receiving tray (412).

7. A refrigeration unit, characterized in that: The refrigeration unit comprises an internal unit of the refrigeration unit according to any one of claims 1 to 6, wherein the refrigeration unit further comprises an external unit (43) of the refrigeration unit, and the internal unit of the refrigeration unit and the external unit (43) of the refrigeration unit are connected via a pipeline.

8. A refrigerated truck, characterized in that: The refrigeration unit according to claim 7 is included, wherein the refrigerated vehicle includes a compartment (20), the internal unit of the refrigeration unit is arranged in the compartment (20), and the refrigeration unit is arranged outside the compartment (20); In the forward direction of the refrigerated truck, the drain outlet (4121) of the internal unit of the refrigeration unit is located in front of the air outlet (4123).

9. A method for controlling an indoor unit of a refrigeration unit according to any one of claims 1 to 6, characterized in that: The following steps are involved: Obtaining the real-time water level at one end of the accommodating chamber where the air outlet (4123) is provided; When it is determined that the real-time water level is higher than the first preset water level and the duration reaches the first preset duration, the water receiving tray (412) is rotated to lower the height of the drain outlet (4121).

10. The method for controlling the indoor unit of a refrigeration unit according to claim 9, characterized in that: The following steps are also included: Obtaining the real-time humidity at the drain outlet (4121); When it is determined that the real-time humidity is greater than the preset humidity, the rotation of the water receiving tray (412) is stopped and the real-time water level at one end of the accommodating chamber provided with the air outlet (4123) is continued to be obtained; When it is determined that the real-time water level is higher than a second preset water level and the duration reaches the second preset duration, and at the same time the real-time humidity at the drain outlet (4121) is lower than the preset humidity, the water receiving tray (412) is rotated to lower the height of the drain outlet (4121); Wherein, the second preset water level is lower than the first preset water level.

11. The method for controlling an indoor unit of a refrigeration unit according to claim 10, wherein: The following steps are also included: When it is determined that the real-time water level at one end of the accommodating chamber where the air outlet (4123) is provided is lower than the second preset water level and the duration reaches a third preset duration, and at the same time, the real-time humidity at the drain outlet (4121) is lower than the preset humidity, the water receiving tray (412) is rotated in the opposite direction to raise the height of the drain outlet (4121).

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