Indoor unit of central air conditioner

Abstract

The invention discloses a central air conditioner indoor unit, and relates to the technical field of central air conditioners, the central air conditioner indoor unit comprises a fan and a refrigeration box, at least one fan is installed on the refrigeration box, the fan comprises a machine shell, an impeller, a connecting frame and a first motor, the machine shell is of a hollow structure and is provided with an air inlet and an air outlet, and the impeller is installed on the machine shell. One end of the connecting frame is fixed to the air inlet side, the other end of the connecting frame extends into the machine shell and is fixedly connected with the first motor, the driving end of the first motor is connected with the impeller, a filtering assembly is arranged on the air outlet side and comprises a transition box, fixing blocks are arranged at the four corners in the transition box, and the fixing blocks are connected with the first motor. A pressure sensing module is laid on the upper side face of the fixing block and connected with a first spring, the other end of the first spring is connected with a filter screen, and an infrared detection module is arranged on the inner wall of the transition box. Impurities in air flow can be filtered, and reasons for uneven air flow can be checked.

Description

Technical Field

[0001] The invention relates to the technical field of central air conditioners, in particular to a central air conditioner indoor unit. Background Art

[0002] The central air conditioner indoor unit is an important part of the central air conditioning system. It is responsible for transferring the heat and cold generated by the cold and heat source system to the indoor space to achieve the purpose of regulating the indoor temperature. Generally, the central air conditioner indoor unit mainly includes a fan, a refrigeration system and a transmission pipeline. The fan is used as an input unit to transport the external gas to the evaporator of the refrigeration system for cooling, and then transported to each room by the transmission pipeline.

[0003] In order to prevent dust, bacteria and pollutants from entering the air conditioning system, thereby ensuring the cleanliness and health of the indoor air, a filter device such as a filter is usually installed at the fan air inlet of the central air conditioner indoor unit. However, the fan has a large power and inhales a large amount of air. Over a period of time, a large amount of dust will be intercepted on the surface of the filter, thus affecting the air intake. Existing filters are generally replaced and cleaned regularly, but the impurity content in the air is not constant. In the case of poor air quality, the cycle of replacing the filter will be shortened accordingly. Summary of the invention

[0004] The object of the present invention is to provide a central air-conditioning indoor unit to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a central air-conditioning indoor unit, comprising a fan and a refrigeration box, the fan being installed on the refrigeration box and at least one being provided, wherein the fan comprises a casing, an impeller, a connecting frame and a motor 1, wherein the casing is a hollow structure and is provided with an air inlet and an air outlet, one end of the connecting frame is fixed on the air inlet side, the other end of the connecting frame extends into the casing and is connected and fixed to the motor 1, the driving end of the motor 1 is connected to the impeller, the impeller rotates in cooperation with the inside of the casing, and a filter assembly is provided on the air outlet side for filtering out impurities in the airflow.

[0006] According to the above technical solution, the casing is designed as a volute shell and adopts a short-tongue volute structure, which is used to collect the airflow from the air inlet and then guide it to the air outlet, effectively converting part of the dynamic pressure of the gas into static pressure. The air inlet is provided with a collector, which adopts an arc structure to make the gas enter the impeller evenly and ensure the minimum flow loss of the airflow.

[0007] According to the above technical solution, the impeller adopts a forward curved impeller, which is used to throw the airflow out of the impeller at a higher flow rate, so as to obtain a larger outlet pressure.

[0008] According to the above technical solution, the refrigeration box is a hollow structure with a heat exchange pipeline inside. The refrigeration box is connected to an external refrigeration system. Liquid refrigerant flows in the heat exchange pipeline for heat exchange with the gas input by the fan, thereby achieving the effect of lowering the gas temperature.

[0009] According to the above technical solution, the filtering component includes a transition box, fixed blocks are arranged at the four corners of the transition box, a pressure sensing module is laid on the upper side of the fixed block and is connected to a spring 1, a filter is connected to the other end of the spring 1, the filter is slidably matched with the inner wall of the transition box, and an infrared detection module is arranged on the inner wall of the transition box to monitor the position of the filter.

[0010] According to the above technical solution, in the state of no wind pressure, the filter is supported by spring 1 and maintained at a certain height. At this time, the pressure sensing module only detects the pressure signals from spring 1 and the filter. The infrared detection module is set to a strip shape. When there is no filter shielding, the infrared detection module detects the distance signal reaching the inner wall on the other side of the transition box. When there is a filter shielding, the distance signal detected by the infrared detection module is that when there is airflow passing through, the filter is pushed down by the airflow to squeeze the spring 1. At this time, the pressure sensing module only detects that the pressure signal becomes larger.

[0011] According to the above technical solution, the transition box is opened on both sides relative to the initial height of the filter screen, and a preparation chamber is provided at one side of the transition box. A brush assembly is provided in the preparation chamber. The brush assembly is threadedly connected with two screws, and one end of the screw extending out of the preparation chamber is connected to motor 2.

[0012] According to the above technical solution, a collecting chamber is provided at the opening on the other side of the transition box, an electric push rod is fixed to the collecting chamber relative to the opening side, a valve block is connected to the driving end of the electric push rod, the size of the valve block should be able to completely cover the opening, and an impurity adsorption layer is provided inside the collecting chamber.

[0013] According to the above technical solution, the brush assembly includes a slide plate, a telescopic cover, a fixed plate and a brush block, wherein the slide plate cooperates with the screw thread, the fixed end of the telescopic cover is connected to the slide plate, the telescopic end of the telescopic cover is connected to the fixed plate, and the brush block is arranged on the lower side of the fixed plate.

[0014] According to the above technical solution, a number of electromagnetic blocks are arranged at intervals on the lower side of the slide plate, and an attraction block is arranged on the fixed plate corresponding to each electromagnetic block. A second spring is sleeved on the outer side of the attraction block and the second spring connects the slide plate and the fixed plate respectively.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a filter assembly at the air outlet of the fan, can purify the gas input into the room without affecting the air intake volume; by providing an infrared detection module, it can judge whether the airflow is uniform according to the detected filter height signal deviation, and the filter blockage can be checked in combination with the brush assembly, thereby determining the cause of uneven airflow and improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall front structure of the present invention; Figure 2 It is a partial schematic diagram of the present invention; Figure 3 is a partial schematic diagram of a fan of the present invention; Figure 4 It is a schematic diagram of a motor connection structure of the present invention; Figure 5 is a schematic diagram of a filter assembly of the present invention; Figure 6 is a schematic diagram of the initial state of the filter screen of the present invention; Figure 7 It is a schematic diagram of the wind pressure state of the filter screen of the present invention; Figure 8 The present invention Figure 7 A magnified schematic diagram of area A; Fig. 9 is a cross-sectional view of the collection chamber of the present invention; Fig.10 is a cross-sectional view of the preparation chamber of the present invention; Fig.11 The present invention Fig.10 Schematic diagram of the power-on status of area B; Fig.12 The present invention Fig.10 Schematic diagram of power-off status of area B; In the figure: 1. refrigeration box; 11. heat exchange pipeline; 21. casing; 22. impeller; 23. connecting frame; 24. motor one; 3. collector; 4. transition box; 41. fixing block; 42. spring one; 43. filter; 44. infrared detection module; 5. preparation room; 51. slide plate; 52. telescopic cover; 53. fixing plate; 54. brush block; 55. electromagnetic block; 56. attraction block; 57. spring two; 6. screw; 7. motor two; 8. collection chamber; 81. electric push rod; 82. valve block; 83. impurity adsorption layer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-12 The present invention provides a technical solution: a central air-conditioning indoor unit, including a fan and a refrigeration box 1, the fan is installed on the refrigeration box 1 and is provided with at least one, wherein the fan includes a casing 21, an impeller 22, a connecting frame 23 and a motor 24, wherein the casing 1 is a hollow structure and is provided with an air inlet 25 and an air outlet 26, one end of the connecting frame 23 is fixed to the side of the air inlet 25, the other end of the connecting frame 23 extends into the casing 1 and is connected and fixed to the motor 24, the driving end of the motor 24 is connected to the impeller 22, the impeller 22 is rotatably matched with the inside of the casing 21, and a filter component is provided on the side of the air outlet 26 for filtering impurities in the air flow.

[0019] The casing 21 is designed in a volute shape and adopts a short-tongue volute structure, which is used to collect the airflow flowing in from the air inlet 25 and then guide it to the air outlet 26, effectively converting part of the dynamic pressure of the gas into static pressure.

[0020] In one embodiment, the air inlet 25 is provided with a collector 3, and the collector 3 adopts an arc-shaped structure, which is used to make the gas enter the impeller 22 evenly and ensure that the air flow loss is minimized.

[0021] The impeller 22 is a forward curved impeller, which is used to throw the airflow out of the impeller 22 at a higher flow velocity, thereby obtaining a higher outlet pressure.

[0022] In actual operation, the motor 24 is started to drive the impeller 22 to rotate at a high speed, and the external air flow is introduced into the casing 21 from the air inlets 25 on both sides, and then thrown out from the impeller 22 at a higher flow rate, and is led out from the air outlet 26 to the refrigeration box 1 for cooling treatment, and finally the cooled air flow is transported to the room.

[0023] The refrigeration box 1 is a hollow structure, and a heat exchange pipe 11 is arranged inside it. The refrigeration box 1 is connected to an external refrigeration system. Liquid refrigerant flows in the heat exchange pipe 11 for exchanging heat with the gas input by the fan, thereby achieving the effect of reducing the gas temperature.

[0024] like Figures 5 to 7 As shown, the filtering assembly includes a transition box 4, and fixed blocks 41 are arranged at the four corners of the transition box 4. A pressure sensing module is laid on the side surface of the fixed block 41 and is connected to a spring 42. The other end of the spring 42 is connected to a filter screen 43. The filter screen 43 is slidably matched with the inner wall of the transition box 4. An infrared detection module 44 is arranged on the inner wall of the transition box 4 to monitor the position of the filter screen 43.

[0025] Supplementary explanations based on the above structure are as follows: in the state of no wind pressure, the filter 43 is supported by the spring 42 and maintained at a certain height. At this time, the pressure sensing module only detects the pressure signals from the spring 42 and the filter 43. The infrared detection module 44 is set in a strip shape. When there is no filter 43 blocking, the infrared detection module 44 detects the distance signal reaching the inner wall on the other side of the transition box 4. When there is a filter 43 blocking, the distance signal detected by the infrared detection module 44 is 0. When there is airflow passing through, the filter 43 is pushed down by the airflow to squeeze the spring 42. At this time, the pressure signal detected by the pressure sensing module only becomes larger.

[0026] Further, such as Figure 8 As shown, the transition box 4 is opened on both sides relative to the initial height of the filter 43, and a preparation chamber 5 is provided at one side of the transition box 4. A brush assembly is provided in the preparation chamber 5, and the brush assembly is threadedly connected with two screws 6. One end of the screw 6 extending out of the preparation chamber 5 is connected to a motor 2 7.

[0027] In actual operation, in a state without wind pressure, the brush assembly can clean the surface of the filter 43. When the motor 2 7 drives the screw 6 to rotate, the brush assembly will move along the direction of the screw 6 to sweep the accumulated dust and impurities on the surface of the filter 43 to the opening on the other side, thereby achieving the cleaning effect of the filter 43.

[0028] like Fig. 9 As shown, a collecting chamber 8 is provided at the opening on the other side of the transition box 4. An electric push rod 81 is fixed to the collecting chamber 8 relative to the opening side. The driving end of the electric push rod 81 is connected to a valve block 82. The size of the valve block 82 should be able to completely cover the opening. An impurity adsorption layer 83 is provided inside the collecting chamber 8.

[0029] Supplementary explanations based on the above structure are as follows: when there is no need to clean, the electric push rod 81 pushes the valve block 82 to cover the opening corresponding to the transition box 4, and the brush assembly is placed in the preparation room 5 and covers the other side opening corresponding to the transition box 4 to avoid disturbing or blocking the airflow. The impurity adsorption layer 83 is filled with a material with strong adsorption properties. After dust and impurities fall into the collection chamber 8, they will cover the surface of the impurity adsorption layer 83. At this time, the electric push rod 81 pushes down the valve block 82, and uses the downward pressure airflow to push the impurities into the impurity adsorption layer 83 and firmly adsorb them, thereby avoiding dust scattering in the air.

[0030] In one embodiment, the brush assembly includes a slide plate 51, a telescopic cover 52, a fixed plate 53 and a brush block 54, wherein the slide plate 51 is threadedly matched with the screw rod 6, the fixed end of the telescopic cover 52 is connected to the slide plate 51, the telescopic end of the telescopic cover 52 is connected to the fixed plate 53, and the brush block 54 is arranged on the lower side of the fixed plate 53.

[0031] Preferably, the brush block 54 has an extension on one side facing the transition box 4, and the length of the extension matches the wall thickness of the transition box 4 to ensure that the brush block 54 can completely push out the dust and impurities from the other opening of the transition box 4.

[0032] Furthermore, a plurality of electromagnetic blocks 55 are arranged at intervals on the lower side of the sliding plate 51, and a suction block 56 is arranged on the fixed plate 53 corresponding to each electromagnetic block 55. A second spring 57 is sleeved outside the suction block 56, and the second spring 57 is respectively connected to the sliding plate 51 and the fixed plate 53.

[0033] It should be added that: as Figures 10-12 shown, when the electromagnetic block 55 is powered on, the generated magnetic force grabs and tightly adsorbs the suction block 56. At this time, the second spring 57 and the telescopic cover 52 contract, driving the fixed plate 53 and the brush block 54 to move upward. The telescopic cover 52 is used to isolate the inside and outside to prevent dust from entering. At this time, the height of the lower side of the brush block 54 is consistent with the height of the filter screen 43 under the non-wind pressure state. When the electromagnetic block 55 is powered off, the electromagnetic block 55 loses its magnetic force and separates from the suction block 56. At this time, the second spring 57 and the telescopic cover 52 are pulled down. Under the thrust of the second spring 57, the brush block 54 is pressed downward on the surface of the filter screen 43, and can closely adhere to the surface of the filter screen 43 to more powerfully brush off dust and impurities. When reaching the other opening, the electromagnetic block 55 is powered on, and the height of the brush block 54 and the filter screen 43 is restored. At this time, the brush block 54 continues to push forward, pushing the dust to the collection chamber 8. At the same time, combined with the pressure sensing module, it can be judged whether the brush block 54 is in contact with the filter screen 43.

[0034] The specific working process is as follows: Step 1: The refrigeration system connected to the refrigeration box 1 is started, and liquid refrigerant is transported into the heat exchange pipeline 11; Step 2: The fan is started, and external air flow is input into the refrigeration box 1; Step 3: The air flow first passes through the filter assembly to filter out the entrained impurities, then is cooled in the refrigeration box 1, and finally is transported to the room.

[0035] Specifically, in Step 3, the filter assembly evaluates the air flow circulation state according to the pressure sensing module and the infrared detection module 44: The infrared detection module 44 records the initial height of the filter screen 43. Preferably, the infrared detection module 44 is provided with two detection bands arranged side by side and staggered. The inclination of the filter screen 43 is judged according to whether the signals detected by the two detection bands are the same, that is: Set the height signals detected by the two detection bands to a and b respectively, When a < b, the height of the filter screen 43 detected by the detection band corresponding to the signal a is lower than the height of the filter screen 43 detected by the detection band corresponding to the signal b. At this time, the filter screen 43 is inclined towards the side of the signal a, and the wind pressure on the side of the filter screen 43 facing a is greater than that on the other side; When a=b, the height of the filter 43 detected by the detection band corresponding to signal a is equal to the height of the filter 43 detected by the detection band corresponding to signal b. At this time, the filter 43 is parallel to the ground, and the wind pressure on both sides of the filter 43 is uniform. When a>b, the height of the filter 43 detected by the detection band corresponding to signal a is higher than the height of the filter 43 detected by the detection band corresponding to signal b. At this time, the filter 43 is tilted toward the signal b side. At this time, the wind pressure of the filter 43 toward the b side is greater than the other side. Furthermore, the uniform wind pressure corresponds to whether the airflow is uniform. The uniform airflow is the ideal state. In order to avoid interference from other factors, the airflow is assumed to be uniform under the normal state of the fan. The difference c of the height signals on both sides is calculated. , set a limit value C, if , the wind pressure deviation is within the allowable range, and the air flow is determined to be uniform at this time; if , the wind pressure deviation exceeds the allowable range, and it is determined that the airflow is uneven. Because the airflow should be uniform under normal conditions of the fan, when the airflow deviation exceeds the allowable range, it is related to the state of the fan itself or whether the filter 43 is blocked.

[0036] Based on the above situation, the filter 43 is cleaned to determine the cause of the uneven airflow, the fan is turned off, the filter 43 is reset, and the brush assembly is cleaned once. In the process of moving back, the fan is started again to push down the filter 43 to separate the brush assembly from the filter 43. While preventing the brush assembly from sweeping the dust back into the preparation room 5, the dust on the brush assembly is indirectly cleaned, and the height deviation of the filter 43 is recorded. The cleaning process is repeated multiple times. If the height deviation of the filter 43 cannot be restored to the allowable range, the cause of the uneven airflow is not related to the filter 43, and the fan itself should be checked, such as whether the impeller is worn; if after multiple cleanings, the height deviation of the filter 43 is restored to the allowable range, the cause of the uneven airflow is that the filter 43 is blocked. After unblocking the filter 43, the fan continues to work normally.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A central air conditioner indoor unit, comprising a fan and a refrigeration box (1), characterized in that: The fan is mounted on the refrigeration box (1) and is provided with at least one fan, wherein the fan comprises a casing (21), an impeller (22), a connecting frame (23) and a motor (24), wherein the casing (1) is a hollow structure and is provided with an air inlet (25) and an air outlet (26), one end of the connecting frame (23) is fixed to the side of the air inlet (25), the other end of the connecting frame (23) extends into the casing (1) and is connected and fixed to the motor (24), the driving end of the motor (24) is connected to the impeller (22), the impeller (22) is rotatably matched with the inside of the casing (21), and a filter component is provided on the side of the air outlet (26) for filtering impurities in the air flow.

2. A central air conditioner indoor unit according to claim 1, characterized in that: The casing (21) is designed to be in the shape of a volute and adopts a short-tongue type volute tongue structure.

3. A central air conditioner indoor unit according to claim 2, characterized in that: The air inlet (25) is provided with a current collector (3), and the current collector (3) has an arc-shaped structure.

4. A central air conditioner indoor unit according to claim 3, characterized in that: The impeller (22) is a forward curved impeller.

5. A central air conditioner indoor unit according to claim 1, characterized in that: The filter assembly comprises a transition box (4), wherein the four corners of the transition box (4) are provided with fixed blocks (41), the upper side of the fixed block (41) is provided with a pressure sensing module and is connected to a spring 1 (42), the other end of the spring 1 (42) is connected to a filter screen (43), the filter screen (43) is slidably matched with the inner wall of the transition box (4), and an infrared detection module (44) is provided on the inner wall of the transition box (4) for monitoring the position of the filter screen (43).

6. A central air conditioner indoor unit according to claim 5, characterized in that: The transition box (4) is opened on both sides relative to the initial height of the filter screen (43); one side of the transition box (4) is provided with a preparation chamber (5); a brush assembly is provided in the preparation chamber (5); two screw rods (6) are threadedly connected to the brush assembly; one end of the screw rod (6) extending out of the preparation chamber (5) is connected to a second motor (7).

7. A central air-conditioning indoor unit according to claim 6, characterized in that: The other side opening of the transition box (4) is provided with a collecting chamber (8), an electric push rod (81) is fixed to the collecting chamber (8) relative to the opening side, a driving end of the electric push rod (81) is connected to a valve block (82), the valve block (82) is sized to completely cover the opening, and an impurity adsorption layer (83) is provided inside the collecting chamber (8).

8. A central air conditioner indoor unit according to claim 7, characterized in that: The brush assembly comprises a slide plate (51), a telescopic cover (52), a fixed plate (53) and a brush block (54), wherein the slide plate (51) is threadedly matched with the screw rod (6), the fixed end of the telescopic cover (52) is connected to the slide plate (51), the telescopic end of the telescopic cover (52) is connected to the fixed plate (53), and the brush block (54) is arranged on the lower side of the fixed plate (53).

9. A central air conditioner indoor unit according to claim 8, characterized in that: The specific workflow is as follows: Step 1: The refrigeration system connected to the refrigeration box (1) is started to transport liquid refrigerant into the heat exchange pipeline (11); Step 2: The fan is started to input external airflow into the refrigeration box (1); Step 3: The airflow is first filtered through a filter assembly to remove impurities, then cooled in a refrigeration box (1), and finally transported indoors; Specifically, in step 3, the filtering component evaluates the air flow state according to the pressure sensing module and the infrared detection module (44): the infrared detection module (44) records the initial height of the filter screen (43). Preferably, the infrared detection module (44) is provided with two detection bands arranged side by side and staggered, and the inclination of the filter screen (43) is judged according to whether the signals detected by the two detection bands are consistent, that is: Set the height signals detected by the two detection bands as a and b respectively, When a < b, the height of the filter screen (43) detected by the detection band corresponding to signal a is lower than the height of the filter screen (43) detected by the detection band corresponding to signal b. At this time, the filter screen (43) inclines towards the side of signal a, and the wind pressure on the side of the filter screen (43) towards a is greater than that on the other side; When a = b, the height of the filter screen (43) detected by the detection band corresponding to signal a is equal to the height of the filter screen (43) detected by the detection band corresponding to signal b. At this time, the filter screen (43) is parallel to the ground, and the wind pressures on both sides of the filter screen (43) are uniform; When a > b, the height of the filter screen (43) detected by the detection band corresponding to signal a is higher than the height of the filter screen (43) detected by the detection band corresponding to signal b. At this time, the filter screen (43) inclines towards the side of signal b, and the wind pressure on the side of the filter screen (43) towards b is greater than that on the other side.

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