Outlet air backflow control device and air conditioner comprising same

Abstract

The utility model provides an air outlet backflow control device and an air conditioner comprising the same, relates to the technical field of air conditioners, and solves the technical problems that an air conditioning unit cannot improve condensing pressure and cannot establish reliable pressure difference to ensure reliable operation of a compressor in an ultralow-temperature environment. The air outlet backflow control device comprises a device body, an air baffle and a driving source. The device body is installed on the air outlet side and internally provided with an airflow channel. The tail end of the airflow channel faces a to-be-heated component located on the upstream of the air outlet side. The driving source is mounted in the device body; the wind shield is movably arranged in the device body and is in transmission connection with the driving source, and the wind shield can be driven by the driving source to move into the air outlet air flow path to guide the air outlet air flow to the starting end of the air flow channel so as to conduct hot air backflow. According to the utility model, hot air sent out by the condensing fan can be guided back to the condenser and then passes through the condenser again, so that the condensing pressure is improved, and a stable pressure difference is quickly established.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an air outlet and return flow control device and an air conditioner comprising the same. Background Art

[0002] The use environment of special field air conditioning equipment is relatively harsh. Some air conditioners need to be used at -40℃ or lower, especially air conditioning systems that use ethylene glycol solution as the refrigerant. In a low temperature environment, the temperature required for the cooled load is much higher than the ambient temperature. When the air conditioner is refrigerating, the evaporation temperature is high and the condensation temperature is low. The pressure difference cannot be established for a long time. However, when the compressor is running at low frequency, there is an operating range, that is, the high and low pressure difference needs to be guaranteed to ensure the reliable and stable operation of the compressor.

[0003] like Figure 1 As shown in the figure, the reliable operating range of the compressor is a block diagram composed of evaporation pressure and condensation pressure. The condensation pressure must always be higher than the evaporation pressure to have a pressure difference, so that the compressor can return oil and operate reliably. At present, compressor manufacturers are all studying reliable operation technology under lower pressure difference, but the results are relatively few. The evaporation pressure of air-conditioning equipment used in special fields such as energy storage is 1.093MPa, and the condensation pressure is required to be at least 1.6MPa (24℃). However, at -40℃ in ultra-low temperature environment, the condensation pressure cannot be reached. Note: The evaporation pressure depends on the control temperature and heat dissipation required by the load. For example, if the load requires the cooling temperature to be around 30℃, then the cold water temperature supplied by the air conditioner must be about 20-25℃, and the evaporation pressure of the evaporator is about the refrigerant saturation pressure corresponding to 15-20℃. Taking energy storage air-conditioning equipment as an example, the required coolant temperature needs to be around 18℃, so the evaporation pressure is too high; the condensation pressure depends on the heat exchange of the condenser. When the ambient temperature is extremely low, the condensation temperature will not be high under normal circumstances, and it must be lower than the above evaporation temperature. In other words, the condensation pressure is lower than the evaporation pressure, and the pressure difference cannot be established.

[0004] At present, in order to solve the problem of being unable to establish a pressure difference in a low-temperature environment, variable frequency fans or variable condensing areas are often used, which have significant effects and can be expanded to -15℃ ambient temperature, but no manufacturer can still achieve -40℃~-15℃. Some manufacturers use natural cooling, but natural cooling requires auxiliary piping systems such as fluorine pumps, and the unit structure is complex, the cost is high, and the idle rate is high. Utility Model Content

[0005] The utility model aims to provide an air outlet reflux control device and an air conditioner comprising the same, so as to solve the technical problems existing in the prior art that the air conditioning unit cannot increase the condensing pressure in an ultra-low temperature environment and cannot establish a reliable pressure difference to ensure the reliable operation of the compressor.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides an air outlet backflow control device, comprising a device body, a wind shield, and a driving source; wherein:

[0008] The device body is installed on the air outlet side and has an air flow channel inside;

[0009] The end of the air flow channel faces the component to be heated located upstream of the air outlet side;

[0010] The driving source is installed in the device body;

[0011] The windshield is movably arranged in the device body and is transmission-connected to the driving source. Driven by the driving source, it can move into the air outlet air flow path to guide the air outlet air flow to the beginning of the air flow channel for hot air reflux.

[0012] The air outlet reflux control device provided by the utility model can guide the hot air sent by the condensing fan back to the front of the condenser and pass through the condenser again, thereby increasing the condensing pressure and quickly establishing a stable pressure difference, solving the technical problem that the air-conditioning unit cannot increase the condensing pressure in an ultra-low temperature environment.

[0013] As a further improvement of the utility model, the device body comprises a vertical pole, an end plate and a surrounding plate; wherein:

[0014] There are two end plates, which are arranged in parallel and at intervals;

[0015] The two ends of the vertical rod are respectively connected to a corner of the two end plates;

[0016] The enclosure panels are arranged around the other corners of the two end panels;

[0017] An air inlet and an air outlet are respectively formed between the two ends of the enclosure and the vertical poles.

[0018] As a further improvement of the present invention, the end plate is a right-angled fan-shaped structure; the enclosure is arranged around the arc-shaped edge of the end plate; and the vertical pole is connected to the right angle of the end plate.

[0019] As a further improvement of the present invention, the device body also includes a guide frame arranged on one side of the air inlet, the guide frame is in a U-shaped structure, and the open end is vertically connected to the two end plates; the inner sides of the three sides of the guide frame are provided with sliding grooves for limiting and guiding the wind shield.

[0020] As a further improvement of the present invention, the windshield is a roller-type windshield, and the driving source includes a motor and a roller; the motor is mounted on the top end plate, and the output shaft passes through the end plate and is transmission-connected to the roller; the roller is rotatably arranged between the two end plates; one end of the windshield is rolled on the roller, and the other end is slidably arranged in the slide groove.

[0021] As a further improvement of the present invention, guide heads are respectively provided at the top and bottom of the end of the wind shield, the diameter of the guide heads is greater than the thickness of the wind shield, and the diameter of the guide heads is adapted to the width of the slide groove.

[0022] As a further improvement of the present invention, the reel is arranged on a side of the end plate close to the enclosure plate.

[0023] As a further improvement of the utility model, the wind shield is made of a thin steel plate or an aluminum plate.

[0024] As a further improvement of the present invention, the length of the guide frame along the width direction of the air outlet side is smaller than the width of the air outlet side.

[0025] The air outlet and return flow device of the utility model is an independent device, which can be selected according to the use environment of the air-conditioning unit, and the air outlet and return flow device has only one control object, which is a stepper motor. The control system of the air-conditioning unit reserves a control interface for connecting the stepper motor. When sold in places with extremely low ambient temperature in winter, the unit is equipped with an air outlet and return flow device, and the return flow device is fixed to the side of the unit fan by bolts, and the stepper motor is connected to the interface reserved by the main control of the air-conditioning unit. When the "air outlet and return flow" function is selected as "open" in the control system, the ultra-low temperature operation function of the air-conditioning unit is expanded, which not only has a simple structure and convenient control, but also reduces the difficulty and cost of manufacturing the unit.

[0026] The utility model provides an air conditioner, comprising a housing, a condenser, a condensing fan and the air outlet and return flow control device; wherein:

[0027] The condenser is arranged in the shell;

[0028] The condensing fan is arranged on the air outlet side of the housing;

[0029] The outlet air return flow control device is installed on the outlet air side to guide the outlet air flow back to the front side of the condenser.

[0030] The air conditioner of the utility model is equipped with an air outlet reflux control device. When the ambient temperature is low and the condensing pressure of the air-conditioning chiller exceeds (is lower than) the operating range of the compressor, the reflux device can be controlled to open and close, so that the hot air delivered by the condensing fan is guided back to the front of the condenser and passes through the condenser again, thereby increasing the condensing pressure and quickly establishing a stable pressure difference. When the ambient temperature in winter is lower than -40°C to -15°C, the air-conditioning equipment can quickly establish a pressure difference, ensuring that the compressor always operates within the designed pressure difference range, expanding the operating range of the unit, achieving year-round cooling, and improving the reliability of the unit.

[0031] As a further improvement of the present invention, the number of the air outlet and return flow control device is one or two. When there is one air outlet and return flow control device, it is installed on one side of the shell; when there are two air outlet and return flow control devices, they are respectively installed on both sides of the shell.

[0032] In the air conditioner of the utility model, one or two air outlet return flow devices can be installed. When one is installed, the fan needs to be opened when the ultra-low temperature operation can be shielded by the return flow device. When two are installed, the opened fan needs to correspond to the air outlet return flow device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a diagram of the reliable operating range of the compressor in the air conditioner;

[0035] Figure 2 It is a structural schematic diagram of the air conditioner in the utility model;

[0036] Figure 3 It is a structural schematic diagram of the air outlet and return flow control device of the utility model;

[0037] Figure 4 It is a top view of the air outlet and return flow control device of the utility model;

[0038] Figure 5 It is a top view of the air conditioner of the utility model.

[0039] In the figure: 1. shell; 2. air outlet and return flow control device; 3. condensing fan; 4. air flow channel; 5. device body; 51. vertical pole; 52. end plate; 53. enclosure; 54. mounting surface; 55. guide head; 56. air inlet; 57. air outlet; 58. guide frame; 59. slide groove; 6. wind shield; 7. motor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0041] like Figure 3-Figure 4 As shown, the utility model provides an air outlet reflux control device 2, which can be installed on an air conditioner to reflux hot air, thereby increasing the condensation pressure; specifically, the air outlet reflux control device includes a device body 5, a wind shield 6, and a driving source; wherein:

[0042] The device body 5 is installed on the air outlet side and has an air flow channel 4 inside, which can allow air flow to pass through for guided return flow; it should be noted here that the air outlet side referred to here refers to the side where the condensing fan 3 is installed;

[0043] The end of the air flow channel 4 faces the component to be heated located upstream of the air outlet side; when the air outlet and return flow control device 2 is installed in the air conditioner, the component to be heated is the condenser;

[0044] The driving source is installed in the device body 5;

[0045] The wind shield 6 is movably arranged in the device body 5 and is connected to the driving source. It can be moved to the air flow path on the air outlet side under the drive of the driving source to guide the air flow to the starting end of the air flow channel 4 to return the hot air into the condenser.

[0046] The air outlet reflux control device 2 provided by the utility model can guide the hot air delivered by the condensing fan 3 back to the front of the condenser and pass through the condenser again, thereby increasing the condensing pressure and quickly establishing a stable pressure difference, thereby solving the technical problem that the air-conditioning unit cannot increase the condensing pressure in an ultra-low temperature environment.

[0047] like Figure 3 As shown, the device body 5 includes a vertical rod 51, an end plate 52 and a surrounding plate 53; wherein:

[0048] There are two end plates 52, which are arranged in parallel and spaced apart;

[0049] The two ends of the vertical rod 51 are respectively connected to one corner of the two end plates 52;

[0050] The enclosure plates 53 are arranged around the other corners of the two end plates 52;

[0051] An air inlet 56 and an air outlet 57 are formed between the two ends of the enclosure 53 and the vertical pole 51 respectively.

[0052] The area enclosed by the enclosure 53 , the end plate 52 and the vertical pole 51 is the air flow channel 4 . The air flows into the air flow channel 4 through the air inlet 56 , and then flows back to the front side of the condenser of the air conditioner through the air outlet 57 .

[0053] As an optional implementation mode of the present utility model, in order to facilitate smooth guidance of airflow backflow and reduce backflow dead corners, in this embodiment, the end plate 52 is a right-angle fan-shaped structure; the enclosure 53 is arranged around the arc edge of the end plate 52; and the vertical rod 51 is connected to the right angle of the end plate 52.

[0054] In order to ensure the smooth sliding of the windshield 6 and the stability during sliding, Figure 3 and Figure 4 As shown, the device body 5 also includes a guide frame 58 arranged on one side of the air inlet 56. The guide frame 58 is a U-shaped structure, and the open end is vertically connected to the two end plates 52; the inner sides of the three sides of the guide frame 58 are provided with sliding grooves 59 for limiting and guiding the windshield plate 6.

[0055] When the driving source is started, the front end of the wind shield 6 will move along the slide groove 59 and be pushed to the air outlet side, thereby partially blocking the outlet air flow. The blocked outlet air flow will enter the air flow channel 4, then flow back to the front side of the condenser and enter the condenser again.

[0056] In order to reduce the volume of the air outlet and return flow control device 2 while adjusting the shielding area as needed, in the present embodiment, the wind shield 6 is a roller-type wind shield 6, that is, the wind shield 6 can be rolled up and can also be flattened after being released, and this action can be repeated; the driving source includes a stepper motor 7 and a roller; the motor 7 is mounted on the top end plate 52, and the output shaft passes through the end plate 52 and is connected to the roller transmission; the roller is rotatably arranged between the two end plates 52; one end of the wind shield 6 is rolled up on the roller, and the other end is slidably arranged in the slide groove 59.

[0057] In order to achieve smooth curling of the windshield 6, in this embodiment, the windshield 6 is made of a thin steel plate or an aluminum plate. When made of a thin steel plate, the thickness can be 0.3-0.8 mm.

[0058] Taking into account that the windshield 6 is relatively thin and is made of metal material, and in order to reduce friction resistance, the width of the slide groove 59 should be greater than the thickness of the windshield 6, so there is a gap between the slide groove 59 and the windshield 6. In order to facilitate the smooth sliding of the windshield 6, guide heads 55 are respectively provided at the top and bottom of the end of the windshield 6. The guide heads 55 are hemispherical structures with smooth surfaces. The diameter of the guide heads 55 is greater than the thickness of the windshield 6, and the diameter of the guide heads 55 is adapted to the width of the slide groove 59.

[0059] In order to increase the area of ​​the airflow channel 4 and the speed of the return airflow, the reel is arranged on the side of the end plate 52 close to the enclosure 53 to form a larger airflow channel 4 between the reel and the vertical pole 51 .

[0060] As an optional embodiment of the present invention, the length of the guide frame 58 along the width direction of the air outlet side is smaller than the width of the air outlet side. Through this structural setting, the wind shield 6 can only block part of the air flow on the air outlet side.

[0061] The air outlet and return flow device of the utility model is an independent device, which can be selected according to the use environment of the air-conditioning unit, and the air outlet and return flow device has only one control object, the stepper motor 7, and the control system of the air-conditioning unit has a reserved control interface. When sold in places with extremely low ambient temperature in winter, the unit is equipped with an air outlet and return flow device, and the return flow device is fixed to the side of the unit fan by bolts, and the stepper motor 7 is connected to the interface reserved by the main control of the air-conditioning unit. In the control system, the "air outlet and return flow" function is selected as "open", and the ultra-low temperature operation function of the air-conditioning unit is expanded. It not only has a simple structure and convenient control, but also reduces the difficulty and cost of manufacturing the unit.

[0062] like Figure 2 and Figure 5 As shown, the utility model provides an air conditioner, comprising a housing 1, a condenser, a condensing fan 3 and an air outlet and return flow control device 2; wherein:

[0063] The condenser is arranged in the shell 1;

[0064] The condensing fan 3 is arranged on the air outlet side of the housing 1;

[0065] The mounting surface 54 of the air outlet reflux control device 2 is installed on the air outlet side by bolts to guide the air outlet airflow back to the front side of the condenser. Specifically, the air outlet reflux control device 2 is fixed to the side of the condensing fan 3 of the air conditioner by bolts, and the stepper motor 7 is connected to the interface reserved by the main control of the air conditioner. In the control system, the "air outlet reflux" function is selected as "on", and the ultra-low temperature operation function expansion of the air conditioning unit is completed. The air conditioner of the utility model is configured with an air outlet reflux control device 2. When the ambient temperature is low and the condensing pressure of the air conditioning chiller exceeds (is lower than) the operating range of the compressor, the hot air sent by the condensing fan 3 is guided back to the front of the condenser by controlling the opening and closing of the reflux device, and passes through the condenser again, thereby increasing the condensing pressure and quickly establishing a stable pressure difference, so that when the ambient temperature in winter is lower than -40℃~-15℃, the air conditioning equipment can quickly establish a pressure difference, ensure that the compressor always operates within the design pressure difference range, expand the unit operation range, achieve year-round refrigeration, and improve the unit reliability.

[0066] As a further improvement of the present invention, the number of the air outlet and return flow control device 2 is one or two. When there is one air outlet and return flow control device 2, it is installed on one side of the shell 1; when there are two air outlet and return flow control devices 2, they are respectively installed on both sides of the shell 1.

[0067] In the air conditioner of the utility model, one or two air outlet return flow devices can be installed. When one is installed, the fan needs to be opened when the ultra-low temperature operation can be shielded by the return flow device. When two are installed, the opened fan needs to correspond to the air outlet return flow device.

[0068] When the ultra-low temperature operation extension function of the air-conditioning unit is turned on, the air-conditioning unit can operate when the ambient temperature is lower than -15℃. The specific operation control scheme is as follows:

[0069] A. The air conditioning unit control system has preset the compressor operating range data, that is, the corresponding relationship between the evaporation pressure and the maximum and minimum condensing pressures;

[0070] B. The air conditioning unit can detect the evaporation pressure and condensation pressure, and can detect the ambient temperature (the temperature sensing element is arranged in front of the condenser, that is, the temperature before the ambient air enters the condenser);

[0071] C. The compressor and fan of the air-conditioning unit are both variable frequency. When the ambient temperature is low, the fan operating frequency is reduced first to reduce the condensing air volume, thereby increasing the condensing pressure and establishing the minimum pressure difference required for the compressor operation;

[0072] D. Air conditioning unit control system real-time monitoring P 冷凝 and P 蒸发 , according to P 蒸发 Find AP in the preset operating range database 冷凝 (minimum condensing pressure), calculate △P=P 冷凝 -AP 冷凝 , when △P<0, detect the operating frequency f of condensing fan 3 风机 Is it greater than Af? 风机 (minimum operating frequency of the fan), when f 风机 >Af 风机 , reduce the operating frequency of condensing fan 3 until △P ≥ 0.

[0073] E. When f 风机 =Af 风机 , still △P<0, the control system gives a start command to the stepper motor 7 of the air outlet return flow control device 2, and the stepper motor 7 starts to run according to the command, driving the wind shield 6 to rotate, and the wind shield moves forward along the slide slot 59 to block the front part of the condensing fan 3, and the blocked high-temperature air outlet is pressed Figure 4The air flows back to the condenser in a certain way, increasing the air inlet temperature of the condenser and thus increasing the condensing pressure. When △P ≥ 0 is detected, the stepper motor 7 stops. 冷凝 Equal to BP 冷凝 (maximum condensing pressure), the control system sends a command to the stepper motor 7, the stepper motor 7 operates to rotate the main shaft, and the windshield 6 is recovered to P 冷凝 ≤BP 冷凝 (Maximum condensing pressure)-△P 回差 (preset hysteresis), stop recycling.

[0074] F. In winter, after the unit startup command is issued, first check the ambient temperature:

[0075] When -15℃≤T 环境 When the temperature is ≤0℃, start the condensing fans with the minimum number and minimum frequency, and then start the compressor. After the compressor is turned on, check P 冷凝 and P 蒸发 , control according to steps D and E;

[0076] When -25℃≤T 环境 When the temperature is less than -15℃, start the condensing fan 3 with the minimum number and minimum frequency, start the air return control device 2 simultaneously, move the wind shield 6 to the maximum shielding position, and then start the compressor. After the compressor is turned on, detect P 冷凝 and P 蒸发 , control according to steps D and E;

[0077] When -40℃≤T 环境 The temperature is less than -25℃, the condensing fan is not turned on, the air return control device 2 is started, the wind shield 6 is moved to the maximum shielding position, the compressor is turned on, and the condensing fan is started after 5 to 10 seconds. The condensing fan runs at the minimum number and lowest frequency. 冷凝 and P 蒸发 , control according to steps D and E.

[0078] When T 环境 When the temperature is less than -40℃, it is forbidden to start the machine.

[0079] When the air conditioner is not equipped with the air outlet reflow control device 2, the "air outlet reflow" function is selected as "off" in the control system. If it is not turned off, the air outlet reflow control will be entered after the ambient temperature is lower than -15°C, but the detection △P is always less than 0, and it will shut down after 60s (the time variable can be set).

[0080] The air conditioner of the utility model can realize internal circulation of hot air, quickly increase the condensing pressure, ensure the pressure difference of the unit under ultra-low ambient temperature, ensure the controllable operation of the compressor, realize the use of lower ambient temperature, and independently configure modules, so the structure is simpler.

[0081] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0082] In the description of the present invention, 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 directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0083] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0087] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An air return control device, characterized in that: It includes a device body, a windshield, and a driving source; wherein: The device body is installed on the air outlet side and has an air flow channel inside; The end of the air flow channel faces the component to be heated located upstream of the air outlet side; The driving source is installed in the device body; The windshield is movably arranged in the device body and is transmission-connected to the driving source. Driven by the driving source, it can move into the air outlet air flow path to guide the air outlet air flow to the beginning of the air flow channel for hot air reflux.

2. The air outlet backflow control device according to claim 1, characterized in that: The device body comprises a vertical pole, an end plate and a surrounding plate; wherein: There are two end plates, which are arranged in parallel and at intervals; The two ends of the vertical rod are respectively connected to a corner of the two end plates; The enclosure panels are arranged around the other corners of the two end panels; An air inlet and an air outlet are respectively formed between the two ends of the enclosure and the vertical poles.

3. The air outlet backflow control device according to claim 2, characterized in that: The end plate is a right-angle fan-shaped structure; the enclosure plate is arranged around the arc-shaped edge of the end plate; and the vertical pole is connected at the right angle of the end plate.

4. The air outlet backflow control device according to claim 2, characterized in that: The device body also includes a guide frame arranged on one side of the air inlet, the guide frame is in a U-shaped structure, and the open end is vertically connected to the two end plates; the inner sides of the three sides of the guide frame are provided with sliding grooves for limiting and guiding the windshield plate.

5. The air outlet backflow control device according to claim 4, characterized in that: The windshield is a reel-type windshield, and the driving source includes a motor and a reel; the motor is mounted on the end plate at the top, and the output shaft passes through the end plate and is transmission-connected to the reel; the reel is rotatably arranged between the two end plates; one end of the windshield is rolled on the reel, and the other end is slidably arranged in the slide groove.

6. The air outlet backflow control device according to claim 5, characterized in that: The top and bottom of the end of the windshield are respectively provided with guide heads, the diameter of the guide heads is greater than the thickness of the windshield, and the diameter of the guide heads is adapted to the width of the slide groove.

7. The air outlet backflow control device according to claim 5, characterized in that: The reel is arranged on a side of the end plate close to the enclosure plate.

8. The air outlet backflow control device according to claim 1, characterized in that: The wind shield is made of a thin steel plate or an aluminum plate.

9. The air outlet backflow control device according to claim 4, characterized in that: The length of the guide frame along the width direction of the air outlet side is smaller than the width of the air outlet side.

10. An air conditioner, characterized in that: It comprises a housing, a condenser, a condensing fan and an air outlet and return flow control device as claimed in any one of claims 1 to 9; wherein: The condenser is arranged in the shell; The condensing fan is arranged on the air outlet side of the housing; The outlet air return flow control device is installed on the outlet air side to guide the outlet air flow back to the front side of the condenser.

11. The air conditioner according to claim 10, characterized in that: The number of the air outlet and return flow control devices is one or two. When there is one air outlet and return flow control device, it is installed on one side of the shell; when there are two air outlet and return flow control devices, they are respectively installed on both sides of the shell.

Images