Structure for reducing working temperature of motor in aluminum wire and copper-clad aluminum wire compressor

Abstract

The utility model discloses a structure for reducing the working temperature of a motor in an aluminum wire and copper-clad aluminum wire compressor, and relates to the technical field of compressors, in particular to a structure for reducing the working temperature of a motor in an aluminum wire and copper-clad aluminum wire compressor. A motor is arranged on a crankshaft and a compressor shell; the crankshaft is of a hollow structure, is limited in the axial direction of a bearing matching surface of the movable vortex, the upper support and the lower support and is limited on a thrust surface of the lower support; the air suction pipe is arranged on the compressor shell; an air folding piece is arranged at the position, located on the inner side opening of the compressor shell, of the air suction pipe, so that one part of low-temperature refrigerant entering the compressor from the air suction pipe is directly blown to the motor to cool the motor, and the other part of the low-temperature refrigerant is blown to refrigerating machine oil on the lower portion of the compressor to cool; oil holes are machined in the positions, located on the bearing matching faces, of the crankshaft and communicated with the hollow interior of the crankshaft. According to the technical scheme of the utility model, the problem of insufficient compressor performance and reliability caused by large heating amount of an aluminum wire / copper-clad aluminum wire motor in the prior art is solved.

Description

Technical Field

[0001] The utility model discloses a structure for reducing the working temperature of a motor in an aluminum wire and copper clad aluminum wire compressor, relates to the technical field of compressors, and in particular to a structure for reducing the working temperature of a motor in an aluminum wire and copper clad aluminum wire compressor. Background Art

[0002] For scroll compressors, motor temperature is a key technical parameter to monitor. To reduce costs, some new compressors are developed using more economical aluminum / copper-clad aluminum wire for the compressor motor. Because aluminum and copper-clad aluminum wire have lower electrical conductivity than copper wire, more electrical energy is converted into heat in the motor windings during compressor operation, causing the motor temperature to rise above that of traditional copper-wire motors. This is particularly true for high-horsepower and high-speed models. When the motor operates at high temperatures, in the short term, it increases power consumption, reducing the compressor's cooling efficiency and failing to achieve performance targets. Furthermore, the motor protector's operating parameters are closely related to motor temperature. When the motor temperature is high, the protector may not activate under appropriate operating conditions, weakening its protective effect. In the long term, prolonged operation of the motor at high winding temperatures significantly reduces its service life, failing to achieve compressor reliability targets.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to research and design a new structure for reducing the operating temperature of the motor in the aluminum wire and copper-clad aluminum wire compressor, so as to overcome the problems existing in the prior art. Summary of the Invention

[0004] In view of the technical problem raised in the above-mentioned prior art that the high heat generation of aluminum wire / copper clad aluminum wire motors leads to insufficient compressor performance and reliability, a structure for reducing the operating temperature of motors in aluminum wire and copper clad aluminum wire compressors is provided. The utility model mainly provides an air deflector at the air inlet of the compressor to drain the low-temperature refrigerant sucked into the compressor, so that the refrigerant is no longer directly blown into the vortex assembly for the compression process, but is blown to the motor and the motor winding for convection heat exchange to cool the motor. In addition, a small amount of refrigerant is blown to the refrigerator oil pool to cool the refrigerator oil, and then the oil is sucked into the hollow interior of the crankshaft through the oil suction port at the bottom of the crankshaft. Finally, the refrigerator oil with a lower temperature is splashed onto the point machine through a specially processed oil spray hole to cool the motor again, and then flows back to the lower cover oil pool under the action of gravity to complete the cooling motor cycle.

[0005] The technical means adopted by this utility model are as follows:

[0006] A structure for reducing the operating temperature of a motor in an aluminum wire and copper-clad aluminum wire compressor comprises: a movable scroll, an upper support, an intake pipe, a crankshaft, a motor, and a lower support; the motor is mounted on the crankshaft and the compressor housing; the crankshaft is a hollow structure, limited in the axial direction by the bearing mating surfaces of the movable scroll, the upper support, and the lower support, and limited in the thrust surface of the lower support; the intake pipe is provided on the compressor housing;

[0007] Furthermore, the intake pipe is provided with an air-bending plate at the inner opening of the compressor housing, so that part of the low-temperature refrigerant entering the compressor from the intake pipe is directly blown to the motor to cool the motor, and the other part of the low-temperature refrigerant is blown to the refrigeration oil at the bottom of the compressor to cool it;

[0008] Furthermore, the crankshaft is machined with oil holes at the positions of the respective bearing mating surfaces, and the oil holes are communicated with the hollow interior of the crankshaft;

[0009] Furthermore, during the operation of the crankshaft, the oil suction port at the bottom of the crankshaft sucks the cooled refrigeration oil into the hollow interior of the crankshaft, and then splashes the refrigeration oil around the motor through the oil hole, thereby achieving a cooling effect again.

[0010] Furthermore, when the compressor is in operation, low-temperature refrigerant continuously enters the interior of the compressor, and the motor can be maintained at a relatively low operating temperature, thereby stabilizing various parameters of the compressor, such as cooling capacity, power, and current.

[0011] Furthermore, the deflector is a suitable structure with four-sided rings, welded to the inner side of the compressor housing through three welding points, facing the intake pipe, located on the upper part of the motor, with the mouth facing downward.

[0012] Furthermore, the deflector is composed of a left baffle, a front baffle, an upper baffle and a right baffle, forming a suitable structure surrounded by four sides, which blocks the refrigerant entering from the suction pipe from directly rushing towards the moving scroll, forcing the low-temperature refrigerant to flow in the direction of the motor and the refrigeration oil to achieve a cooling effect.

[0013] Furthermore, after the special deflector guides the low-temperature refrigerant, it is either cooled by blowing it directly to the motor, or the refrigeration oil is cooled first and then indirectly to the motor through the oil holes on the crankshaft, forming a cooling solution for high-heat-generating motors (aluminum wire / copper-clad aluminum wire), thereby improving the performance and reliability of the compressor.

[0014] Furthermore, the oil hole adopts a bell-mouth design with a flaring angle of 60°, so that the refrigeration oil in the crankshaft can form a large-scale splash at the oil outlet. In addition to lubricating the bearing mating surface, the refrigeration oil can also achieve the purpose of cooling the motor through splashing.

[0015] The working process of this utility model is:

[0016] When the scroll compressor is operating, a steady stream of refrigerant enters the compressor cavity through the air intake. Normally, the low-temperature, low-pressure refrigerant drawn in has a low density and flows toward the upward moving scroll, undergoing the compression process. After the air vents are installed, the surrounding structure of the air vents acts as a guide, forcing the refrigerant to flow toward the bottom of the compressor, with some of the refrigerant blowing directly toward the motor. Because the winding of the aluminum / copper-clad aluminum motor generates a significant amount of harmful heat during operation, the motor temperature will always be higher than the temperature of the low-temperature refrigerant drawn into the compressor. The low-temperature refrigerant airflow continuously flushes through the motor, cooling it through convection heat transfer.

[0017] In addition, another portion of the low-temperature refrigerant flows downward and is blown toward the refrigeration oil sump, cooling the refrigeration oil at the bottom of the compressor. When the compressor is running, the crankshaft rotates at high speed. Centrifugal force draws the refrigeration oil from the oil intake into the crankshaft cavity, where it flows upward against gravity. This low-temperature refrigerant oil is then splashed onto the motor surface through special oil holes on the outside, where it is cooled again. The splashed oil then flows back to the oil sump under the lower cover under the action of gravity, completing the motor cooling cycle.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. The design provided by this utility model for reducing the operating temperature of the motor in aluminum wire and copper-clad aluminum wire compressors achieves the purpose of controlling the flow direction of the refrigerant in the compressor cavity by providing an air deflector at the compressor suction port. Compared with other methods for guiding air flow inside the compressor, this method is low-cost, relatively simple in process, suitable for mass production, and does not require changes to the external dimensions of the compressor or the structure of other internal components.

[0020] 2. The utility model provides a design for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor. The crankshaft oil hole is processed into a bell mouth to achieve dual functions, which can not only complete the basic lubrication function, but also achieve the effect of splashing out the refrigeration oil.

[0021] 3. The design provided by the present invention for reducing the operating temperature of the motor in aluminum wire and copper-clad aluminum wire compressors involves machining of the deflector and crankshaft oil hole with relatively low machining difficulty, and does not require changes to the structure and assembly relationship of other components inside the compressor. Therefore, this design is highly economical in cost-reduction solutions for compressors that switch from copper wire motors to aluminum wire motors.

[0022] 4. The design provided by the present invention for reducing the operating temperature of the motor in the aluminum wire and copper-clad aluminum wire compressor significantly reduces the operating temperature of the motor and increases the service life of the motor, thereby improving the overall reliability of the compressor;

[0023] 5. The design provided by the present invention reduces the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressors, thereby improving the energy efficiency of the compressor by reducing the motor power, making it possible for low-cost aluminum wire / copper clad aluminum wire compressors to be applied in markets such as Europe and North America that have more stringent energy efficiency requirements.

[0024] In summary, the technical solution of the present invention solves the problem in the prior art that the aluminum wire / copper clad aluminum wire motor generates high heat, resulting in insufficient compressor performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a front view of the utility model air-bending piece;

[0028] Figure 3 This is a bottom view of the air-bending plate of the utility model;

[0029] Figure 4 This is a schematic diagram of the oil hole structure of the utility model.

[0030] In the figure: 1, movable scroll 2, upper support 3, deflector 3-1, welding point 3-2, left baffle 3-3, positive baffle 3-4, upper baffle 3-5, right baffle 4, suction pipe 5, crankshaft 5-1, oil hole 5-2, oil suction port 6, motor 7, lower support 8, refrigeration oil. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0035] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0038] like Figure 1 As shown, the utility model provides a structure for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor, comprising: a movable scroll 1, an upper support 2, an intake pipe 4, a crankshaft 5, a motor 6, and a lower support 7; the motor 6 is mounted on the crankshaft 5 and the compressor housing; the crankshaft 5 is a hollow structure, limited in the axial direction by the bearing mating surfaces of the movable scroll 1, the upper support 2, and the lower support 7, and limited in the thrust surface of the lower support 7; the intake pipe 4 is provided on the compressor housing;

[0039] like Figure 1 As shown, the intake pipe 4 is located at the inner side of the compressor housing and is provided with an air-bending plate 3, so that a part of the low-temperature refrigerant entering the compressor from the intake pipe 4 is directly blown to the motor 6 to cool the motor 6, and the other part of the low-temperature refrigerant is blown to the refrigeration oil 8 at the bottom of the compressor for cooling; the crankshaft 5 is processed with oil holes 5-1 at the positions of the bearing mating surfaces, and the oil holes 5-1 are connected to the hollow interior of the crankshaft 5; the oil suction port 5-2 at the bottom of the crankshaft 5 sucks the cooled refrigeration oil 8 into the hollow interior of the crankshaft 5, and then splashes the refrigeration oil 8 to the surrounding of the motor 6 through the oil hole 5-1, thereby achieving the cooling effect again.

[0040] like Figure 2 As shown, the deflector 3 is a four-sided ring structure, which is welded to the inner side of the compressor housing through three welding points 3-1, facing the intake pipe 4, located on the upper part of the motor 6, with the mouth facing downward.

[0041] like Figure 3As shown, the air folding piece 3 is composed of a left baffle 3-2, a front baffle 3-3, an upper baffle 3-4 and a right baffle 3-5, forming a four-sided ring structure, which blocks the way of the refrigerant from the suction pipe 4 directly rushing to the direction of the moving scroll 1, forces the low-temperature refrigerant to flow in the direction of the motor 6 and the refrigerating oil 8, and achieves the cooling effect.

[0042] As shown, Figure 4 As shown, the oil hole 5-1 adopts a bell mouth design, and the flared angle of the oil hole 5-1 is 60°, so that the refrigerating oil 8 in the crankshaft 5 can form a large range of splashing at the oil outlet, and the refrigerating oil 8 can not only lubricate the bearing matching surface, but also achieve the purpose of cooling the motor 6 through splashing.

[0043] The air folding piece 3 is welded on the inner side of the compressor shell, and the front baffle 3-3 faces the compressor suction pipe 4. The four-sided baffle of the air folding piece 3 forms a five-sided closed rectangular cavity with the compressor shell, which guides the refrigerant entering the compressor; the crankshaft 5 is limited in the radial direction to the bearing matching surface of the moving scroll, the upper support and the lower support, and is limited in the axial direction to the lower support thrust surface, the special oil hole is located on each bearing matching surface, and the oil inlet at the bottom of the crankshaft is located below the refrigerating oil liquid level.

[0044] The four-sided ring air folding piece 3 makes a part of the low-temperature refrigerant entering the compressor from the suction pipe 4 directly blow to the motor 6 to cool the motor, and another part of the low-temperature refrigerant blows to the refrigerating oil 8 at the lower part of the compressor to cool it; during the operation of the crankshaft 5, the centrifugal force is used to suck the refrigerating oil after cooling into the hollow interior of the crankshaft from the oil inlet 5-2, and then the refrigerating oil is splashed around the motor through the special oil hole 5-1, and the cooling effect is achieved again; the splashed refrigerating oil flows back to the lower cover oil pool under the action of gravity.

[0045] In the working state of the compressor, the low-temperature refrigerant continuously enters the interior of the compressor, continuously taking away the harmful heat generated by the operation of the motor, and then entering the scroll assembly to complete the compression process and being discharged from the compressor; the refrigerating oil sprayed from the oil hole flows back to the oil pool at the lower part of the shell, and is continuously cooled by the refrigerant newly entering the compressor, and the refrigerating oil liquid level height maintains dynamic balance. The continuous circulation of the refrigerant and the refrigerating oil constitutes the motor cooling system of the utility model, ensures that the motor can maintain a relatively low operating temperature, so that the cold capacity, power, current and other parameters of the compressor tend to be stable, and provides protection for the performance and reliability of the aluminum wire / copper-clad aluminum wire motor compressor.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A structure for reducing the operating temperature of a motor in an aluminum wire and copper-clad aluminum wire compressor, comprising: A movable scroll (1), an upper support (2), an intake pipe (4), a crankshaft (5), a motor (6), and a lower support (7); the motor (6) is mounted on the crankshaft (5) and the compressor housing; the crankshaft (5) is a hollow structure, limited in the axial direction by the bearing mating surfaces of the movable scroll (1), the upper support (2), and the lower support (7), and limited in the thrust surface of the lower support (7); the intake pipe (4) is arranged on the compressor housing; and the characteristics are: The air intake pipe (4) is located at the inner opening of the compressor housing and is provided with an air folding plate (3), so that a part of the low-temperature refrigerant entering the compressor from the air intake pipe (4) is directly blown toward the motor (6) to cool the motor (6), and the other part of the low-temperature refrigerant is blown toward the refrigeration oil (8) at the bottom of the compressor to cool it; The crankshaft (5) is provided with oil holes (5-1) at the positions of the bearing mating surfaces, and the oil holes (5-1) are communicated with the hollow interior of the crankshaft (5); The oil suction port (5-2) at the bottom of the crankshaft (5) sucks the cooled refrigeration oil (8) into the hollow interior of the crankshaft (5), and then sprays the refrigeration oil (8) around the motor (6) through the oil hole (5-1), thereby achieving a cooling effect again.

2. The structure for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor according to claim 1 is characterized in that: The deflecting plate (3) is a four-sided ring structure, welded to the inner side of the compressor housing through three welding points (3-1), facing the suction pipe (4), located on the upper part of the motor (6), with the mouth facing downward.

3. The structure for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor according to claim 1 is characterized in that: The deflecting plate (3) is composed of a left baffle (3-2), a front baffle (3-3), an upper baffle (3-4) and a right baffle (3-5) to form a suitable four-sided ring structure, which blocks the refrigerant entering from the suction pipe (4) from directly rushing towards the moving scroll (1), forcing the low-temperature refrigerant to flow in the direction of the motor (6) and the refrigeration oil (8) to achieve a cooling effect.

4. The structure for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor according to claim 1, characterized in that: The oil hole (5-1) adopts a bell-mouth design, so that the refrigeration oil (8) in the crankshaft (5) can form a large-scale splash at the oil outlet. In addition to lubricating the bearing mating surface, the refrigeration oil (8) can also achieve the purpose of cooling the motor (6) through splashing.

5. The structure for reducing the operating temperature of the motor in the aluminum wire and copper clad aluminum wire compressor according to claim 1 is characterized in that: The expansion angle of the oil hole (5-1) is 60°.

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