Compressor rotor structure and rotor compressor

Abstract

The utility model provides a compressor rotor structure and a rotor compressor, and the compressor rotor structure comprises a motor rotor; the crankshaft penetrates through the motor rotor; the first balance block is arranged at the first end of the motor rotor, the second balance block is arranged at the second end of the motor rotor, and the first end and the second end are the two opposite ends of the motor rotor in the axial direction; the first balance block and the second balance block are formed through a powder metallurgy process in a die-casting mode. The first balance block and the second balance block adopt the same die-casting die, the first balance block and the second balance block are different in size in the height direction, and the height direction is the punch moving direction of the first balance block and the second balance block in the die-casting process. The compressor provided by the utility model solves the technical problem of high manufacturing cost of the rotor balance block of the compressor in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to the rotor compressor structure design field, specifically, relate to a compressor rotor structure and rotor compressor. BACKGROUND

[0002] In order to balance the dynamic unbalance of the motor rotor of the rotary compressor, the rotary compressor is provided with balancing blocks on the upper and lower sides of the motor rotor. In the related art, the balancing block of the motor rotor of the rotor compressor can adopt a metal cutting piece, a powder metallurgy piece or a structure of metal sheet laminating and riveting. Among them, the balancing block formed by laminating multiple sheets has poor integrity and large wind resistance, which can cause degradation of compressor performance and noise. Therefore, the metal cutting piece and the powder metallurgy piece are more suitable as the balancing block. However, the metal cutting piece balancing block needs to be machined and milled to process the casting blank, which has high processing cost. The powder metallurgy piece balancing block needs to be pressed and sintered by two sets of die casting molds to form the balancing blocks on both sides, which has high design and mold opening cost.

[0003] It can be seen that the related art has the technical problem of high manufacturing cost of the compressor rotor balancing block. At present, there is no effective solution to this technical problem. SUMMARY

[0004] The main purpose of the utility model is to provide a compressor rotor structure and a rotor compressor to solve the technical problem of high manufacturing cost of the compressor rotor balancing block in the related art.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a compressor rotor structure is provided, comprising: a motor rotor; a crankshaft, the crankshaft is arranged in the motor rotor; a first balancing block and a second balancing block, the first balancing block is arranged at a first end of the motor rotor, the second balancing block is arranged at a second end of the motor rotor, the first end and the second end are two ends of the motor rotor opposite along the axial direction; wherein, the first balancing block and the second balancing block are formed by powder metallurgy process; the die casting mold adopted by the first balancing block and the second balancing block is the same, the size of the first balancing block and the second balancing block along the height direction is different, the height direction is the direction of the punch moving in the die casting process of the first balancing block and the second balancing block.

[0006] Further, the height direction of the first balancing block and the height direction of the second balancing block are arranged along the axial direction of the compressor rotor structure.

[0007] Further, the height difference D of the first balancing block and the second balancing block satisfies: 3mm≤D≤10mm.

[0008] Further, the first balance block comprises a first columnar portion extending along a height direction thereof, and the second balance block comprises a second columnar portion extending along a height direction thereof, a size and a shape of a cross section of the first columnar portion are same as a size and a shape of a cross section of the second columnar portion, and a height of the first columnar portion is different from a height of the second columnar portion.

[0009] Further, the first balance block comprises a first end portion, and a cross-sectional area of the first end portion is smaller than a cross-sectional area of the first columnar portion; and the second balance block comprises a second end portion, and a cross-sectional area of the second end portion is smaller than a cross-sectional area of the second columnar portion; and a size and a shape of the first end portion are same as a size and a shape of the second end portion.

[0010] Further, the first end portion comprises: a first end face, the first end face is located at one end of the first end portion away from the first columnar portion, and an area of the first end face is smaller than an area of the cross section of the first columnar portion; and a first transition face, the first transition face connects the first end face and a side face of the first columnar portion; and the second end portion comprises: a second end face, the second end face is located at one end of the second end portion away from the second columnar portion, and an area of the second end face is smaller than an area of the cross section of the second columnar portion; and a second transition face, the second transition face connects the second end face and a side face of the second columnar portion.

[0011] Further, the first end face and the second end face each have an area S1, and the first columnar portion and the second columnar portion each have a cross-sectional area S2, wherein 0.4≤S1 / S2≤0.8.

[0012] Further, the first columnar portion and the second columnar portion each have an arc-shaped structure.

[0013] Further, the first columnar portion and the second columnar portion each comprise two concentrically arranged circular arc faces connected by one or more transition faces, wherein a radius of curvature R of one of the two circular arc faces closer to the crankshaft satisfies: 10mm≤R≤30mm.

[0014] According to another aspect of the present application, a rotor compressor is provided, which comprises the above compressor rotor structure.

[0015] The compressor rotor structure of the embodiment of the utility model comprises: motor rotor, crankshaft, first balance block and second balance block, first balance block is arranged in the first end of motor rotor, second balance block is arranged in the second end of motor rotor, and the first end and the second end are the two ends of motor rotor opposite along the axial direction, wherein, first balance block and second balance block are formed by powder metallurgy process pressure casting, the die mould of first balance block and second balance block is same, the size of first balance block and second balance block along the height direction is different, and the height direction is the punch moving direction of first balance block and second balance block in the pressure casting process, the compressor rotor structure of this structure design, the dynamic balance of rotor structure is adjusted through first balance block and second balance block arranged in the opposite sides of motor rotor, first balance block and second balance block are formed by powder metallurgy process pressure casting, and the same size die mould of two is used, and the weight control of two is realized through the control of the height of two. The scheme of the balance block common mould design effectively saves the design and the opening mould cost, improves the interchangeability of mould and the parts made, improves the flexibility of the production process link of balance block, and solves the technical problem of high manufacturing cost of compressor rotor balance block in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. In the drawings:

[0017] Figure 1 It is the structural schematic view of first balance block of the embodiment of the compressor rotor structure of the utility model under the first visual angle;

[0018] Figure 2 It is the structural schematic view of first balance block of the embodiment of the compressor rotor structure of the utility model under the second visual angle;

[0019] Figure 3 It is the structural schematic view of second balance block of the embodiment of the compressor rotor structure of the utility model under the first visual angle;

[0020] Figure 4 It is the structural schematic view of second balance block of the embodiment of the compressor rotor structure of the utility model under the second visual angle;

[0021] Wherein, the above-mentioned drawing includes the following sign:

[0022] 1, first balance block;10, first mounting hole;11, first cylindrical portion;12, first end portion;121, first transition surface;2, second balance block;20, second mounting hole;21, second cylindrical portion;22, second end portion;221, second transition surface. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] Please refer to Figure 1 In order to achieve the above-mentioned purpose, the embodiment of the present application provides a compressor rotor structure, which comprises: a motor rotor; a crankshaft, the crankshaft is arranged in the motor rotor; a first balance block 1 and a second balance block 2, the first balance block 1 is arranged at a first end of the motor rotor, the second balance block 2 is arranged at a second end of the motor rotor, the first end and the second end are two opposite ends of the motor rotor along the axial direction; wherein the first balance block 1 and the second balance block 2 are formed by powder metallurgy process; the first balance block 1 and the second balance block 2 adopt the same die casting mold, the sizes of the first balance block 1 and the second balance block 2 along the height direction are different, the height direction is the moving direction of the punch in the die casting process of the first balance block 1 and the second balance block 2, that is, the pressure direction of the first balance block 1 and the second balance block 2.

[0025] The compressor rotor structure adopting the structure design adjusts the dynamic balance of the rotor structure through the first balance block 1 and the second balance block 2 arranged on the opposite sides of the motor rotor, the first balance block 1 and the second balance block 2 are formed by powder metallurgy process, and the same size die casting mold is used for the two, and the height of the two is controlled to realize the control of the weight of the two. The scheme of the common mold design of the balance block effectively saves the design and mold opening cost, improves the interchangeability of the mold and the parts manufactured, improves the flexibility of the balance block production process, and solves the technical problem of high manufacturing cost of the compressor rotor balance block in the related art.

[0026] As described above, the first balance block 1 and the second balance block 2 are formed by the same die casting mold, but the heights of the two are different, so that the height of the two is controlled to realize the control of the weight of the two. Since the molds used by the two are the same, the sizes and shapes of the two are consistent except the height.

[0027] In the specific implementation, the first balance block 1 and the second balance block 2 can be formed by using the same mold, or can be formed by using two sets of the same mold.

[0028] In the embodiment, in order to facilitate the installation of the balance block, the first balance block 1 is provided with a first mounting hole 10, and the second balance block 2 is provided with a second mounting hole 20, so that the first balance block 1 and the second balance block 2 are installed to the two ends of the motor rotor through the first mounting hole 10 and the second mounting hole 20 by using fasteners, for example, rivet installation and fixation.

[0029] Specifically, the height direction of the first balance block 1 and the height direction of the second balance block 2 are both arranged along the axial direction of the compressor rotor structure. That is, when the first balance block 1 and the second balance block 2 are installed on the motor rotor, the lengths of the two along the axial direction of the motor rotor are different, which is conducive to more conveniently controlling the circumferential balance of the rotor structure. The height difference D between the first balance block 1 and the second balance block 2 satisfies: 3mm≤D≤10mm.

[0030] In a specific embodiment, the first balance block 1 comprises a first columnar portion 11 arranged along the height direction thereof, the second balance block 2 comprises a second columnar portion 21 arranged along the height direction thereof, the cross-sectional size and shape of the first columnar portion 11 are the same as the cross-sectional size and shape of the second columnar portion 21, and the height of the first columnar portion 11 is different from the height of the second columnar portion 21.

[0031] By designing the first columnar portion 11 and the second columnar portion 21, the cross sections of the first columnar portion 11 and the second columnar portion 21 have the same shape and size, on the one hand, it can facilitate the manufacturing and demolding of powder metallurgy, on the other hand, because the first balance block 1 and the second balance block 2 both have a vertical column segment (the first columnar portion 11 and the second columnar portion 21), so by only changing the height of the vertical column segments of the two, upper and lower balance blocks with the same appearance shape and only different vertical column segment heights can be produced, thereby facilitating and accurately adjusting the weights of the first balance block 1 and the second balance block 2.

[0032] In a preferred embodiment, the height of each of the first columnar portion 11 and the second columnar portion 21 ranges from 2mm to 15mm.

[0033] The first balance block 1 comprises a first end portion 12, the cross-sectional area of the first end portion 12 is smaller than the cross-sectional area of the first columnar portion 11; the second balance block 2 comprises a second end portion 22, the cross-sectional area of the second end portion 22 is smaller than the cross-sectional area of the second columnar portion 21; the size and shape of the first end portion 12 are the same as the size and shape of the second end portion 22.

[0034] In the present embodiment, by designing the first end portion 12 and the second end portion 22, the first end portion 12 and the second end portion 22 have smaller cross-sectional areas relative to the first columnar portion 11 and the second columnar portion 21, that is, the ends of the first balance block 1 and the second balance block 2 are designed as a necked structure, thereby facilitating the reduction of wind resistance and liquid resistance, and further reducing the noise during the operation of the compressor and improving the energy efficiency.

[0035] In order to better reduce the wind resistance and liquid resistance of the balance block, in the embodiment, the first end portion 12 comprises: a first end face, which is located at one end of the first end portion 12 away from the first columnar portion 11, and the area of the first end face is smaller than the area of the cross section of the first columnar portion 11; and a first transition surface 121 connecting the first end face with the side surface of the first columnar portion 11; and the second end portion 22 comprises: a second end face, which is located at one end of the second end portion 22 away from the second columnar portion 21, and the area of the second end face is smaller than the area of the cross section of the second columnar portion 21; and a second transition surface 221 connecting the second end face with the side surface of the second columnar portion 21.

[0036] For the first transition surface 121 or the second transition surface 221, each is composed of an inner transition surface and an outer transition surface, and in actual implementation, the shape of any one of them can be flexibly selected according to actual conditions, for example, the curvature, the convex or concave condition, etc. In a preferred embodiment, the inner transition surface and the outer transition surface are respectively an inner inclined curved surface and an outer inclined curved surface, i.e. a partial conical surface, and the inner transition surface and the outer transition surface are connected by a plane, and the area of a single plane ranges from 10 mm 2 to 20 mm 2 , and the transition plane is inclined to the end face of the first columnar portion 11. That is, there are two inclined planes on the upper part of the balance block for connecting the inner inclined curved surface and the outer inclined curved surface, and such a setting can enhance the reliability of powder metallurgy manufacturing and avoid the difficulty of powder filling at the sharp corner position, thereby reducing the strength or causing a void. The area of a single plane ranges from 10 mm 2 to 20 mm 2 , and if the plane is too small, it is not convenient for processing and manufacturing, and if the plane is too large, it will cause the wind resistance to increase and cause the noise performance to deteriorate.

[0037] In the embodiment, the areas of the first end face and the second end face are both S1, and the cross-sectional areas of the first columnar portion 11 and the second columnar portion 21 are both S2, wherein 0.4≤S1 / S2≤0.8.

[0038] The balance block with such cross-sectional area control has been verified in practice to have smaller wind resistance and liquid resistance when the compressor is running, thereby making the compressor noise smaller, the efficiency higher, and the oil discharge rate lower.

[0039] Specifically, the cross-sectional shape of the first columnar portion 11 and the cross-sectional shape of the second columnar portion 21 each comprise an arc structure.

[0040] The arc structure here should be understood as a structure with an arc, that is, a relatively smooth curved structure, so that it can better adapt to the shape of the motor rotor and rotate more smoothly and reduce resistance when it is installed on the motor rotor.

[0041] Specifically, the first columnar part 11 and the second columnar part 21 each include two circular arc surfaces arranged concentrically and connected by one or more transition surfaces, wherein the radius of curvature R of one of the two circular arc surfaces closer to the crankshaft satisfies: 10mm≤R≤30mm. The radius R is the radius of the inside of the balance block from the center of rotation. Such a setting can reduce fluid turbulence when rotating, thereby reducing noise. If R is too large, the balance block installation position will be too far out, which is not conducive to installation and fixation; if R is too small, the balance block will be installed too close to the inside and block the oil return hole of the motor rotor, which is not conducive to oil return.

[0042] In addition, the embodiment of the utility model also provides a rotor compressor, the rotor compressor includes the compressor rotor structure above.

[0043] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0044] The compressor rotor structure of the embodiment of the utility model comprises: a motor rotor; a crankshaft, the crankshaft is arranged in the motor rotor; a first balance block 1 and a second balance block 2, the first balance block 1 is arranged at the first end of the motor rotor, the second balance block 2 is arranged at the second end of the motor rotor, the first end and the second end are two ends of the motor rotor opposite along the axial direction; wherein the first balance block 1 and the second balance block 2 are pressure die formed by powder metallurgy process; the pressure die mold used by the first balance block 1 and the second balance block 2 is same, the size of the first balance block 1 and the second balance block 2 along the height direction is different, the height direction is the punch moving direction of the first balance block 1 and the second balance block 2 in the pressure die process. The compressor rotor structure with this structure design adjusts the dynamic balance of the rotor structure by the first balance block 1 and the second balance block 2 arranged on the opposite sides of the motor rotor, the first balance block 1 and the second balance block 2 are pressure die formed by powder metallurgy process, and the same size pressure die mold is used for the two, the weight control of the two is realized by controlling the height of the two. The scheme of the balance block common mold design effectively saves the design and opening mold cost, improves the interchangeability of the mold and the parts made, improves the flexibility of the balance block production process link, and solves the technical problem of high manufacturing cost of the compressor rotor balance block in the related art.

[0045] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the exemplary embodiments described herein can assume different alternative orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices illustrated in the attached drawings, and described in the following specification are exemplary embodiments only and should not be typically construed as limiting the scope of the present application.

[0046] It is also important to note that the term "or" as used herein is intended to mean any possible combination of the features, steps or elements it modifies, including one as well as one or more. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It is to be understood that the terminology used herein is for the purpose of describing the exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0048] The preferred embodiments of the present application have been described herein above with the intent of illustrating the principles of operation of the application by reference to one or more preferred embodiments. In construing the specification and claims, it includes all changes, substitutions, improvements, alterations, and modifications of the methods and systems as would be understood by those skilled in the art, with a scope as broad as is allowed under the patent statutes.

Claims

1. A compressor rotor structure, characterized by, The compressor rotor structure comprises: a motor rotor; a crankshaft arranged in the motor rotor; a first balance block (1) arranged at a first end of the motor rotor and a second balance block (2) arranged at a second end of the motor rotor, the first end and the second end being two opposite ends of the motor rotor in the axial direction; wherein the first balance block (1) and the second balance block (2) are formed by powder metallurgy process; the first balance block (1) and the second balance block (2) adopt the same die-casting mold, the sizes of the first balance block (1) and the second balance block (2) in the height direction are different, and the height direction is the moving direction of the punch in the die-casting process.

2. The compressor rotor structure of claim 1, wherein The height direction of the first balance block (1) and the height direction of the second balance block (2) are arranged along the axial direction of the compressor rotor structure.

3. The compressor rotor structure of claim 1, wherein The height difference D between the first balance block (1) and the second balance block (2) satisfies 3mm≤D≤10mm.

4. The compressor rotor structure of claim 1, wherein The first balance block (1) comprises a first columnar portion (11) arranged along the height direction thereof, the second balance block (2) comprises a second columnar portion (21) arranged along the height direction thereof, the size and shape of the cross section of the first columnar portion (11) are the same as the size and shape of the cross section of the second columnar portion (21), and the height of the first columnar portion (11) is different from the height of the second columnar portion (21).

5. The compressor rotor structure of claim 4, wherein The first balance block (1) comprises a first end portion (12), the cross-sectional area of the first end portion (12) is smaller than the cross-sectional area of the first columnar portion (11); the second balance block (2) comprises a second end portion (22), the cross-sectional area of the second end portion (22) is smaller than the cross-sectional area of the second columnar portion (21); the size and shape of the first end portion (12) are the same as the size and shape of the second end portion (22).

6. The compressor rotor structure according to claim 5, wherein the first end portion (12) comprises a first end face located at one end of the first end portion (12) away from the first columnar portion (11), the area of the first end face is smaller than the area of the cross section of the first columnar portion (11); and a first transition face (121) connecting the first end face and the side face of the first columnar portion (11); the second end portion (22) comprises a second end face located at one end of the second end portion (22) away from the second columnar portion (21), the area of the second end face is smaller than the area of the cross section of the second columnar portion (21); and a second transition face (221) connecting the second end face and the side face of the second columnar portion (21).

7. The compressor rotor structure of claim 6, wherein The first end face and the second end face each have an area S1, and the first cylindrical portion (11) and the second cylindrical portion (21) each have a cross-sectional area S2, wherein 0.4≤S1 / S2≤0.

8.

8. The compressor rotor structure of claim 4, wherein The first cylindrical portion (11) and the second cylindrical portion (21) each have a cross-sectional shape comprising an arc structure.

9. The compressor rotor structure of claim 4, wherein The first cylindrical portion (11) and the second cylindrical portion (21) each comprise two concentrically arranged circular arc surfaces connected by one or more transition surfaces, wherein the radius of curvature R of one of the two circular arc surfaces closer to the crankshaft satisfies: 10mm≤R≤30mm.

10. A rotary compressor characterized by comprising: The rotor compressor comprises the compressor rotor structure according to any one of claims 1 to 9.

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