Air-cooled air conditioning unit capable of stably operating at low temperature and fan thereof

Abstract

The invention discloses an air-cooled air conditioning unit capable of stably operating at low temperature. The system comprises an air filter (1), a fin evaporator (2), a liquid separation head (3), an expansion valve (4), a centrifugal blower (5), a drying filter (6), a liquid reservoir (7), a bypass one-way valve (8), a stop valve II (9), a controller (10), a transmission (11), an axial flow fan (12), a one-way valve (13), an outdoor air-cooled condenser (14), a stop valve I (15), a stop valve III (16), a stop valve IV (17), an electric control three-way flow regulating valve (18), a compressor (19), a pressure sensor (20) and a gas-liquid separator (21). The air speed of the outdoor axial flow fan is adjusted, and the refrigerant flow of the outdoor air-cooled condenser is adjusted, so that the condensing pressure in the low-temperature environment is stabilized, and stable and efficient operation of the air-cooled air conditioning unit is guaranteed; through the design of the guide plates and the through holes, the air supply amount of the centrifugal air blower can be increased, and therefore the operation effect of the air-cooled air conditioning unit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning systems, and in particular to an air-cooled air conditioning unit and a fan thereof which operates stably at low temperatures. Background Art

[0002] In some special environments, air-cooled air-conditioning units need to operate in a low-temperature environment. At this time, due to the low outdoor temperature, the condensing pressure of the air-cooled air-conditioning unit is too low, making the unit unable to operate normally or operating poorly. In addition, the air supply fan of the existing air-conditioning unit has the problem of relatively small air supply volume and poor applicability to multiple working conditions. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a low-temperature stable air-cooled air-conditioning unit and its fan, which can stabilize the condensing pressure in a low-temperature environment by adjusting the wind speed of the outdoor axial flow fan and the refrigerant flow through the outdoor air-cooled condenser, thereby ensuring the stable and efficient operation of the air-cooled air-conditioning unit. The design of the guide plate and the through hole can increase the air supply volume of the centrifugal blower, thereby improving the operating effect of the air-cooled air-conditioning unit.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A low-temperature stable air-cooling air-conditioning unit comprises an air filter (1), a finned evaporator (2), a liquid distributor (3), an expansion valve (4), a centrifugal blower (5), a drying filter (6), a liquid storage tank (7), a bypass check valve (8), a stop valve II (9), a controller (10), a transmission (11), an axial flow fan (12), a check valve (13), an outdoor air-cooling condenser (14), a stop valve I (15), a stop valve III (16), a stop valve IV (17), an electric-controlled three-way flow regulating valve (18), a compressor (19), a pressure sensor (20), and a gas-liquid separator (21). The first end of the compressor is connected to the finned evaporator through the gas-liquid separator. The fin evaporator is connected to the outdoor air-cooled condenser, and the other end of the fin evaporator is connected to the liquid receiver through a liquid distributor, an expansion valve, and a drying filter in sequence. An air filter is arranged on one side of the fin evaporator, and a centrifugal blower is arranged on the other side. It is characterized in that: the other end of the liquid receiver is connected to the outdoor air-cooled condenser through a stop valve I, a stop valve II, and a check valve in sequence, the other end of the outdoor air-cooled condenser is connected to the compressor through a stop valve III, a stop valve IV, an electrically controlled three-way flow regulating valve, and a pressure sensor in sequence, the other end of the liquid receiver is connected to the electrically controlled three-way flow regulating valve through a bypass check valve, an axial flow fan is arranged on one side of the outdoor air-cooled condenser, and a driving motor of the axial flow fan is connected to the speed regulator.

[0006] Furthermore, during refrigeration operation in a low-temperature environment, a pressure sensor detects the condensing pressure. When the condensing pressure is detected to be lower than a set value, the speed of the driving motor of the axial flow fan (12) is first reduced through the speed regulator to reduce the air volume of the axial flow fan. If the condensing pressure is still lower than the set value, the speed is further reduced until it reaches the lowest level, and then the axial flow fan is turned off. If the condensing pressure is still lower than the set value, the refrigerant flow through the outdoor air-cooled condenser (14) is gradually reduced through the electronically controlled three-way flow regulating valve, and the excess refrigerant is allowed to directly enter the liquid storage tank (7) through the bypass passage. When the condensing pressure is detected to be higher than the set value, the opposite adjustment is made.

[0007] A centrifugal blower for an air-cooled air-conditioning unit that operates stably at low temperatures, comprising a volute (51), a rectangular air outlet pipe (52), an impeller, and a motor. The impeller is rotatably mounted in the volute, the impeller is connected to the motor via a rotating shaft, the volute is tangentially connected to a rectangular air outlet pipe, the rectangular air outlet pipe comprises a pair of first wall panels (53) and a pair of second wall panels (54) that are arranged opposite to each other; the characteristic is that one or more guide plates (55) are arranged on the inner side of the first wall panel, the guide plates are parallel to the intersection line of the first wall panel and the second wall panel, the first wall panel is provided with a through hole (56), the through hole is arranged at the root of the guide plate, the through hole allows air outside the rectangular air outlet pipe to enter the rectangular air outlet pipe through the through hole and merge with the mainstream, thereby increasing the air supply of the centrifugal blower.

[0008] Furthermore, the guide plate (55) is formed by pressing and shearing on the same sheet material using a pressing die, thereby forming the guide plate and the through hole (56) at one time.

[0009] Furthermore, the guide plate (55) and the through hole (56) are in the shape of a rectangle, a trapezoid or a parallelogram.

[0010] Furthermore, the guide plate (55) is rotated upward or downward around its root by a certain angle by using appropriate tool pressure, so that the setting angle of the guide plate 55 can be adjusted once or multiple times without installation / disassembly.

[0011] Furthermore, the plane where the guide plate (55) is located is parallel to the rotation axis of the impeller or the angle between the plane and the rotation axis of the impeller is 10-45°.

[0012] The present invention provides a low-temperature stable air-cooling air-conditioning unit and its fan, which stabilizes the condensing pressure in a low-temperature environment by adjusting the wind speed of an outdoor axial flow fan and the refrigerant flow rate of an outdoor air-cooling condenser, thereby ensuring stable and efficient operation of the air-cooling air-conditioning unit. The air supply volume of the centrifugal blower can be increased through the design of the guide plate and the through hole, thereby improving the operation effect of the air-cooling air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the connection relationship of the air-cooled air-conditioning unit for low-temperature stable operation of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of a centrifugal blower in the prior art;

[0015] Figure 3 It is a partial structural schematic diagram of the centrifugal blower of the present invention;

[0016] Figure 4 It is a schematic diagram of the local structure of the centrifugal blower of the present invention.

[0017] In the figure: air filter 1, fin evaporator 2, liquid distributor 3, expansion valve 4, centrifugal blower 5, filter dryer 6, liquid storage tank 7, bypass check valve 8, stop valve II 9, controller 10, speed regulator / inverter 11, axial flow fan 12, check valve 13, outdoor air-cooled condenser 14, stop valve I 15, stop valve III 16, stop valve IV 17, electric three-way flow regulating valve 18, compressor 19, pressure sensor 20, gas-liquid separator 21; volute 51, rectangular air outlet duct 52, first wall plate 53, second wall plate 54, guide plate 55 (55'; 55"), through hole 56. DETAILED DESCRIPTION

[0018] In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described in detail in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present invention, which are only used to explain the present invention, not to limit the present invention. It should be noted that, for the convenience of description, only the parts / structures related to the present invention are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0019] 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. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should be the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1As shown, a low-temperature stable air-cooling air-conditioning unit comprises an air filter 1, a fin evaporator 2, a liquid separator 3, an expansion valve 4, a centrifugal blower 5, a drying filter 6, a liquid storage tank 7, a bypass check valve 8, a stop valve II 9, a controller 10, a transmission 11, an axial flow fan 12, a check valve 13, an outdoor air-cooled condenser 14, a stop valve I 15, a stop valve III 16, a stop valve IV 17, an electric three-way flow regulating valve 18, a compressor 19, a pressure sensor 20, and a gas-liquid separator 21. The first end of the compressor 19 is connected to the fin evaporator 2 through the gas-liquid separator 21, and the other end of the fin evaporator 2 is connected to the fin evaporator 2 through the liquid separator 3, the expansion valve 4, and the drying filter in sequence. 6 is connected to the liquid reservoir 7, an air filter 1 is provided on one side of the fin evaporator 2, and a centrifugal blower 5 is provided on the other side; it is characterized in that: the other end of the liquid reservoir 7 is connected to the outdoor air-cooled condenser 14 through the stop valve I 15, the stop valve II 9, and the one-way valve 13 in sequence, the other end of the outdoor air-cooled condenser 14 is connected to the compressor 19 through the stop valve III 16, the stop valve IV 17, the electric control three-way flow regulating valve 18, and the pressure sensor 20 in sequence, the other end of the liquid reservoir 7 is connected to the electric control three-way flow regulating valve 18 through the bypass one-way valve 8, and an axial flow fan 12 is provided on one side of the outdoor air-cooled condenser 14, and the driving motor of the axial flow fan 12 is connected to the speed regulator 11.

[0022] In some special environments, air-cooled air-conditioning units need to operate in a low-temperature environment. At this time, due to the low outdoor temperature, the condensing pressure of the air-cooled air-conditioning unit is too low, making it impossible for the air-cooled air-conditioning unit to operate normally or the operating effect is poor.

[0023] During refrigeration operation in a low-temperature environment, the pressure sensor detects the condensing pressure. When the condensing pressure is detected to be lower than the set value, the speed of the driving motor of the axial flow fan 12 is first reduced through the speed regulator to reduce the air volume of the axial flow fan; if the condensing pressure is still lower than the set value, it is further reduced until it reaches the lowest level, and then the axial flow fan is turned off; if the condensing pressure is still lower than the set value, the refrigerant flow through the outdoor air-cooled condenser is gradually reduced through the electronically controlled three-way flow regulating valve 18, and the excess refrigerant is allowed to directly enter the liquid storage tank 7 through the bypass passage. When the condensing pressure is detected to be higher than the set value, the opposite adjustment is made. In this way, the condensing pressure of the air-cooled air-conditioning unit in a low-temperature environment can be stabilized, so that the air-cooled air-conditioning unit can operate stably and efficiently.

[0024] The present invention discloses an air-cooled air-conditioning unit with stable operation at low temperature, which is a low-temperature air-cooled air-conditioning unit with stable operation under dual-control condensing pressure. It stabilizes the condensing pressure in a low-temperature environment by dual regulation of the wind speed of an outdoor axial flow fan and the refrigerant flow rate through an outdoor air-cooled condenser, thereby ensuring stable and efficient operation of the air-cooled air-conditioning unit.

[0025] like Figure 2-4As shown, a centrifugal blower for an air-cooled air-conditioning unit with low-temperature stable operation includes a volute 51, a rectangular air outlet pipe 52, an impeller, and a motor. The impeller is rotatably installed in the volute 51, and the impeller is connected to the motor through a rotating shaft. The volute 51 is tangentially connected with a rectangular air outlet pipe 52, and the rectangular air outlet pipe 52 includes a pair of first wall panels 53 and a pair of second wall panels 54 arranged opposite to each other; it is characterized in that: one or more guide plates 55 are arranged on the inner side of the first wall panel 53, and the guide plates 55 are parallel to the intersection line of the first wall panel 53 and the second wall panel 54. A through hole 56 is arranged on the first wall panel 53, and the through hole 56 is arranged at the root of the guide plate 55. The through hole 56 allows the air outside the rectangular air outlet pipe 52 to enter the rectangular air outlet pipe 52 through the through hole 56 and merge with the mainstream, thereby increasing the air supply of the centrifugal blower and improving the operation effect of the air-cooled air-conditioning unit.

[0026] The guide plate 55 and the through hole 56 are formed at one time by pressing and shearing on the same plate material through a pressing die, which is simple to manufacture and saves production costs.

[0027] The guide plate 55 and the through hole 56 are in the shape of a rectangle, a trapezoid or a parallelogram.

[0028] The guide plate 55 is rotated upward or downward by a certain angle (such as Figure 4 As shown, such as angle a and angle b), the setting angle of the guide plate 55 (55'; 55") can be adjusted once or multiple times without installation / disassembly to meet the working conditions of various air-cooled air-conditioning units.

[0029] In one embodiment, the plane where the guide plate 55 is located is parallel to the rotation axis of the impeller or the angle between the plane and the rotation axis of the impeller is 10-45°.

[0030] The centrifugal blower of the present invention for a low-temperature stable air-cooling air-conditioning unit can increase the air supply volume of the centrifugal blower through the design of the guide plate 55 (55'; 55") and the through hole 56, thereby improving the operation effect of the air-cooling air-conditioning unit.

[0031] The present invention provides a low-temperature stable air-cooling air-conditioning unit and its fan, which stabilizes the condensing pressure in a low-temperature environment by adjusting the wind speed of an outdoor axial flow fan and the refrigerant flow rate of an outdoor air-cooling condenser, thereby ensuring stable and efficient operation of the air-cooling air-conditioning unit. The air supply volume of the centrifugal blower can be increased through the design of the guide plate and the through hole, thereby improving the operation effect of the air-cooling air-conditioning unit.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The "connection" mentioned above can be a direct connection or an indirect connection, and the "setting", "setting at" and "setting at" can be directly set at or indirectly set at.

[0033] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-temperature stable air-cooling air-conditioning unit, comprising an air filter (1), a fin evaporator (2), a liquid separator (3), an expansion valve (4), a centrifugal blower (5), a filter drier (6), a liquid reservoir (7), a bypass check valve (8), a stop valve II (9), a controller (10), a transmission (11), an axial flow blower (12), a check valve (13), an outdoor air-cooled condenser (14), a stop valve I (15), a stop valve III (16), a stop valve IV (17), an electrically controlled three-way flow regulating valve (18), a compressor (19), a pressure sensor (20), and a gas-liquid separator (21), wherein a first end of the compressor is connected to the fin evaporator via the gas-liquid separator, and the other end of the fin evaporator is connected to the liquid reservoir via the liquid separator, the expansion valve, and the filter drier in sequence, and an air filter is arranged on one side of the fin evaporator, and a centrifugal blower is arranged on the other side; characterized in that: The other end of the liquid receiver is connected to the outdoor air-cooled condenser through stop valve I, stop valve II, and a one-way valve in sequence. The other end of the outdoor air-cooled condenser is connected to the compressor through stop valve III, stop valve IV, an electrically controlled three-way flow regulating valve, and a pressure sensor in sequence. The other end of the liquid receiver is connected to the electrically controlled three-way flow regulating valve through a bypass one-way valve. An axial flow fan is provided on one side of the outdoor air-cooled condenser, and a drive motor of the axial flow fan is connected to the speed regulator.

2. A low temperature stable air-cooling air conditioning unit as claimed in claim 1, characterized in that: During refrigeration operation in a low-temperature environment, the pressure sensor detects the condensing pressure. When the condensing pressure is detected to be lower than the set value, the speed of the driving motor of the axial flow fan (12) is first reduced through the speed regulator to reduce the air volume of the axial flow fan. If the condensing pressure is still lower than the set value, the speed is further reduced until it reaches the lowest level, and then the axial flow fan is turned off. If the condensing pressure is still lower than the set value, the refrigerant flow through the outdoor air-cooled condenser (14) is gradually reduced through the electronically controlled three-way flow regulating valve, and the excess refrigerant is allowed to directly enter the liquid storage tank (7) through the bypass passage. When the condensing pressure is detected to be higher than the set value, the opposite adjustment is made.

3. A centrifugal blower for a low-temperature stable air-cooling air-conditioning unit, which is applied to a low-temperature stable air-cooling air-conditioning unit as claimed in claim 1, comprising a volute (51), a rectangular air outlet pipe (52), an impeller, and a motor, wherein the impeller is rotatably mounted in the volute, the impeller is connected to the motor through a rotating shaft, the volute is tangentially connected with a rectangular air outlet pipe, and the rectangular air outlet pipe comprises a pair of first wall panels (53) and a pair of second wall panels (54) arranged opposite to each other; characterized in that: One or more guide plates (55) are arranged on the inner side of the first wall plate, and the guide plates are parallel to the intersection line of the first wall plate and the second wall plate. A through hole (56) is arranged on the first wall plate, and the through hole is arranged at the root of the guide plate. The through hole allows air outside the rectangular air outlet pipe to enter the rectangular air outlet pipe through the through hole and merge with the mainstream, thereby increasing the air supply volume of the centrifugal blower.

4. The centrifugal blower according to claim 3, characterized in that: The guide plate (55) is formed by pressing and shearing on the same sheet material through a pressing die, thereby forming the guide plate and the through hole (56) at one time.

5. The centrifugal blower according to claim 4, characterized in that: The guide plate (55) and the through hole (56) are in the shape of a rectangle, a trapezoid or a parallelogram.

6. The centrifugal blower according to claim 5, characterized in that: The guide plate (55) is rotated upward or downward around its root by a certain angle by using a suitable tool to apply pressure, so that the setting angle of the guide plate 55 can be adjusted once or multiple times without the need for installation / disassembly.

7. The centrifugal blower according to claim 6, characterized in that: The plane where the guide plate (55) is located is parallel to the rotation axis of the impeller or the angle between the plane and the rotation axis of the impeller is 10-45°.

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