Precision casting balance block

Abstract

The utility model discloses a precision casting balance block, and belongs to the technical field of compressor accessories. An inner hole penetrates through the center of the end plate; the balancing weight is arranged on the surface of the end plate; a plurality of pin holes; wherein the balancing weight and the end plate are integrally formed and arranged in a step shape, and the inner hole is a special-shaped hole. Compared with a round hole in the prior art, the special-shaped hole is expanded outwards from the center, so that the area of the mounting surface of the end plate can be effectively reduced, the thickness of the end plate is adjusted, the time sequence difference of the balance block during wax liquid cooling and casting molten steel cooling is reduced, the deformation of the whole balance block during cooling is reduced, and the service life of the balance block is prolonged. And therefore, the flatness of the balance block on the mounting surface is effectively improved, the reject ratio is reduced, the production efficiency is greatly improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to a precision casting balancing block, belonging to the technical field of compressor accessories. Background Art

[0002] At present, during the operation of the compressor, the crankshaft connected to the motor output shaft will drive the motor output shaft to generate centrifugal force deviating from its rotation center due to the high-speed rotation, thereby affecting the stability of the motor. Therefore, in order to avoid the influence of the crankshaft on the stability of the motor, a balancing block is usually provided on the motor rotor of the compressor. During the rotation of the compressor crankshaft, the balancing block can offset the radial force of the compressor crankshaft on the motor output shaft, thereby making the radial force on the motor output shaft during the rotation reach a balanced state, ensuring the stable operation of the motor.

[0003] In the prior art, balancing blocks are usually cast from molds. However, since their end plates need to be close to the motor rotor, the flatness requirements of the balancing block end plates are relatively high. However, during the current production and casting process of balancing blocks, due to inconsistent cooling timing, the mounting surface flatness of the balancing blocks is poor, and warping often occurs. The poor flatness of the mounting surface leads to a high defective rate of the balancing block products, which greatly increases the production cost.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a precision casting balance block, which solves the problem in the prior art that the balance block often warps during cooling due to the large mounting surface area and insufficient end plate thickness, thereby resulting in a high defective rate of the balance block product and greatly increasing the production cost.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A precision casting balance block, comprising:

[0007] End plate, with an inner hole in the center.

[0008] The counterweight is set on the surface of the end plate.

[0009] Several pin holes,

[0010] The counterweight block and the end plate are integrally formed and arranged in a stepped shape, and the inner hole is one or a combination of a petal shape, a circle of unequal diameters, a regular polygon or an irregular polygon.

[0011] By adopting the above technical solution, the opening of the special-shaped hole can effectively reduce the surface area inside the end plate and reduce part of the volume compared to the circular hole in the prior art, and can be reasonably adjusted to the corresponding position of the end plate or the counterweight block according to the center of gravity requirements, thereby reducing the timing difference between the cooling of the wax liquid and the cooling of the cast steel liquid of the balance block, reducing the deformation of the balance block as a whole during cooling, and thus effectively improving the flatness of the balance block on the installation surface, reducing the defective rate, greatly improving production efficiency, and achieving cost reduction.

[0012] The present invention is further configured as follows: a transition surface is provided at the end portion of the inner portion of the end plate, and the angle between the transition surface and the bottom surface of the end plate is between 0° and 180°.

[0013] By adopting the above technical solution: the cooling shrinkage deformation caused by the cooling time difference of the wax liquid or molten steel due to the inconsistent thickness between the transition surface and the end plate bottom mounting surface area is effectively controlled, the flatness of the balance block during cooling is improved, and the occurrence of warping is effectively controlled, thereby improving the product yield and reducing production costs.

[0014] When the angle between the transition surface and the bottom surface of the end plate is 0°, it is convenient for the later staff to use tools to inspect and correct the end plate, and to select defective products.

[0015] The utility model is further configured as follows: a plurality of pin holes pass through the surface of the end plate or the counterweight block.

[0016] By adopting the above technical solution, dynamic balancing under different assembly requirements can be met.

[0017] The beneficial effects of the present invention are as follows: compared with the circular holes in the prior art, the opening of the special-shaped holes can effectively reduce the area of ​​the end plate mounting surface, adjust the thickness of the end plate, thereby reducing the cooling time difference of different areas of the balance block when the wax liquid and steel liquid are cooled, and reduce the deformation of the balance block as a whole during cooling, thereby effectively improving the flatness of the mounting surface of the balance block after cooling, reducing the defective rate, greatly improving production efficiency, and achieving cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a structural diagram of another embodiment of the present utility model;

[0020] Figure 3 This is a structural diagram of another embodiment of the present utility model;

[0021] Figure 4 This is a structural diagram of another embodiment of the present utility model;

[0022] Figure 5A partial cross-sectional view of another embodiment of the present invention;

[0023] Figure 6 A partial cross-sectional view of another embodiment of the present invention;

[0024] Figure 7 This is a structural diagram of another embodiment of the present utility model;

[0025] Figure 8 This is a structural diagram of another embodiment of the present utility model;

[0026] Figure 9 This is a structural diagram of another embodiment of the present utility model;

[0027] Figure 10 This is a structural diagram of another embodiment of the present utility model;

[0028] Figure 11 This is a structural diagram of another embodiment of the present utility model;

[0029] Figure 12 Schematic diagrams of the structures of four other embodiments of the present invention.

[0030] In the figure: 1, end plate; 2, counterweight; 3, pin hole; 4, transition surface; 5, inner hole; 6, special-shaped end; 7, countersunk hole; 8, inclined surface; 9, slope surface. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0032] like Figure 1 As shown, a precision casting balance weight, comprising:

[0033] The end plate 1 has an inner hole 5 at the center.

[0034] The counterweight block 2 is set on the surface of the end plate 1.

[0035] Several pin holes 3 are used to connect with the motor, and in order to meet the dynamic balance under different assembly requirements, several pin holes 3 are equally spaced or unevenly spaced through the surface of the end plate 1 or the counterweight block 2.

[0036] The counterweight 2 and the end plate 1 are integrally cast and arranged in a stepped shape.

[0037] A transition surface 4 is provided at the top end surface inside the end plate 1 along the circumferential direction. The angle between the transition surface 4 and the bottom surface of the end plate 1 is between 0° and 180°, specifically, greater than or equal to 0° and less than 180°.

[0038] In one embodiment, if Figure 2 As shown, the counterweight block 2 and the end plate 1 are arranged in two steps. From top to bottom, the counterweight block 2 is the first layer and the end plate 1 is the second layer. The angle between the transition surface 4 and the bottom surface of the end plate 1 is 0°. At this time, the thickness of each point on the surface of the end plate 1 is uniform.

[0039] In this embodiment, the structural strength of the end plate 1 is improved and the thickness is uniform, so it can be cooled more evenly, thereby achieving an excellent anti-warping effect. In addition, since each position of the end plate 1 is relatively flat, it is convenient for later staff to use tools to inspect and correct the end plate 1, thereby facilitating the selection of defective products.

[0040] Based on the two-tier ladder of this embodiment, Figure 9 As shown, in another embodiment, the outer edges of the end plate 1 and the counterweight 2 are both inclined with an inclined surface 8, and the angle between the inclined surface 8 and the bottom surface of the end plate 1 is 0° to 90°.

[0041] In one embodiment, if Figure 3 As shown, the counterweight block 2 and the end plate 1 are arranged in three steps. From top to bottom, the counterweight block 2 is the first layer, and the side of the end plate 1 away from the inner hole 5 is horizontally set as the second layer. The angle between the transition surface 4 and the bottom surface of the end plate 1 is 90°. At this time, the side of the end plate 1 close to the inner hole 5 sinks vertically downward to become the third layer, and the thickness of the second layer is greater than the thickness of the third layer.

[0042] In this embodiment, the side of the end plate 1 away from the inner hole 5 serves as the second layer to effectively improve the structural strength of the balance block itself, and is thicker than the side of the end plate 1 close to the inner hole 5, so that when the balance block cools and shrinks, the end plate 1 can effectively suppress the warping caused by uneven shrinkage due to being too thin.

[0043] Based on the three-tier ladder of this embodiment, Figure 10 As shown, in another embodiment, both ends of the counterweight block 2 are provided with inclined slopes 9, and the pin holes 3 are opened on the third layer, the slopes 9 and the counterweight block 2.

[0044] In one embodiment, if Figure 1 As shown, the counterweight block 2 and the end plate 1 are arranged in four steps. From top to bottom, the counterweight block 2 is the first layer, the side of the end plate 1 away from the inner hole 5 is the horizontally arranged second layer, and the angle between the transition surface 4 and the bottom surface of the end plate 1 is greater than 0° and less than 90°. At this time, the transition surface 4 is the third layer with an inclined setting, and at this time the pin hole 3 is provided on the transition surface 4 and a countersunk hole 7 is sunken inward on the transition surface 4 corresponding to the position of the pin hole 3. The end plate 1 is located at the position of the countersunk hole 7 as the fourth layer.

[0045] In this embodiment, the countersunk hole 7 is provided so that when the pin hole 3 and the motor rotor are connected by rivets, the countersunk head of the rivet can be embedded in the countersunk hole 7, thereby improving the connection strength between the balancing block and the motor rotor and effectively meeting different assembly requirements.

[0046] Moreover, the cooling shrinkage deformation caused by the cooling time difference of the wax liquid or the steel liquid due to the inconsistent thickness between the transition surface 4 and the mounting surface area is effectively controlled, the flatness of the balancing block during cooling is improved, and the occurrence of warping is effectively controlled, thereby improving the product yield and reducing production costs.

[0047] Based on the four-tier ladder of this embodiment, Figure 11 As shown, the end surface of the counterweight block 2 facing the inner hole 5 is recessed to provide a fifth layer, and the spacing distance between the bottom surface of the fifth layer and the end plate 1 is at least 0 mm and not higher than the height of the outer edge of the counterweight block 2.

[0048] In another embodiment, Figure 4 As shown, the counterweight block 2 and the end plate 1 are arranged in three steps. From top to bottom, the counterweight block 2 is the first layer, the angle between the transition surface 4 and the bottom surface of the end plate 1 is greater than 0° and less than 90°, and one end of the transition surface 4 extends to the outer side surface of the end plate 1. At this time, the transition surface 4 and the end plate 1 coincide with each other as the second layer. At this time, the pin hole 3 is provided on the transition surface 4 and a countersunk hole 7 is sunken inwardly on the transition surface 4 corresponding to the position of the pin hole 3. The end plate 1 is located at the position of the countersunk hole 7 as the third layer.

[0049] Based on the three-tier ladder of this embodiment, Figure 12 As shown in 12a to 12d, the counterweight block 2 is a special-shaped counterweight block. Along the length direction of the end plate, the cross section of the counterweight block 2 is one or a combination of a triangle, a Y-shape, a semicircle, and an S-shape.

[0050] In one embodiment, if Figure 5 As shown, the counterweight block 2 and the end plate 1 are arranged in three steps. From top to bottom, the counterweight block 2 is the first layer, and the angle between the transition surface 4 and the bottom surface of the end plate 1 is greater than 90° and less than 180°. At this time, the surface of the end plate 1 is set horizontally, and the side close to the inner hole 5 is tilted downward and sunk to become the third layer. At this time, the pin hole 3 is opened at any position of the balance block.

[0051] In another embodiment, Figure 6 As shown, the counterweight block 2 and the end plate 1 are arranged in two steps. From top to bottom, the counterweight block 2 is the first layer, and the angle between the transition surface 4 and the bottom surface of the end plate 1 is greater than 90° and less than 180°. At this time, the surface of the end plate 1 is set horizontally, and the bottom end of the transition surface 4 extends and passes through the bottom surface of the end plate 1. At this time, the end plate 1 is the second layer, and the pin hole 3 is opened at any position of the balance block.

[0052] like Figure 1 and Figure 7As shown, the inner hole 5 is a special-shaped hole, and the shape of the inner hole 5 is one or a combination of a petal shape, a circle with unequal diameters, a regular polygon or an irregular polygon.

[0053] It should be noted that in Figure 1 When the inner hole 5 is in the shape of a petal, the protruding end is a special-shaped end 6. The number of the special-shaped ends 6 is several and the shape can be one or a combination of equal-diameter arcs, unequal-diameter arcs or elliptical arcs.

[0054] like Figure 7 As shown, when the inner hole 5 is a regular polygon, its shape is one of convex polygons such as triangle, rectangle, pentagon, hexagon, etc., and its outer contour line can be one of straight line, curve or arc or a combination thereof.

[0055] like Figure 8 As shown, when the inner hole 5 is an irregular polygon, its shape is one of concave polygons such as a four-pointed star, a five-pointed star, a six-pointed star, etc., and its outer contour line can be one or a combination of a straight line, a curve or an arc.

[0056] In this embodiment, since the inner hole 5 is in the shape of a special-shaped hole, the opening of the special-shaped hole can effectively reduce the installation surface area of ​​the end plate 1 compared to the round hole in the prior art, and adjust the thickness of the end plate 1 to reduce the timing difference between the cooling of the wax liquid and the cooling of the cast steel liquid of the balance block, reduce the deformation of the balance block as a whole during cooling, and thus effectively improve the flatness of the installation surface of the balance block, reduce the defective rate, greatly improve production efficiency, and achieve cost reduction.

[0057] In addition, the inner hole 5 is a special-shaped hole, which can save production raw materials and reduce production costs.

[0058] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various modifications and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such modifications and improvements fall within the scope of protection claimed by the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A precision casting balance weight, characterized in that ,include: The end plate (1) has an inner hole (5) extending through the center. The counterweight (2) is arranged on the surface of the end plate (1). Several pin holes (3) for cooperating with the motor rotor, The counterweight (2) and the end plate (1) are integrally formed and arranged in a two-layer, three-layer or four-layer stepped manner, and the inner hole (5) is a special-shaped hole and has a shape of one or a combination of a petal shape, an unequal diameter circle, a regular polygon or an irregular polygon; A transition surface (4) is provided at the end portion inside the end plate (1), and the angle between the transition surface (4) and the bottom surface of the end plate (1) is between 0° and 180°; When the end plate (1) and the counterweight (2) are arranged in two steps, the counterweight (2) and the end plate (1) are respectively the first layer and the second layer, and the thickness of each point on the surface of the end plate (1) is uniform; When the end plate (1) and the counterweight (2) are arranged in a three-layer staircase, the counterweight (2) is the first layer, the side of the end plate (1) away from the inner hole (5) is horizontally arranged as the second layer, and the side of the end plate (1) close to the inner hole (5) sinks vertically downward to form the third layer, and the thickness of the second layer is greater than the thickness of the third layer; When the end plate (1) and the counterweight (2) are arranged in a four-layer staircase, the counterweight (2) is the first layer, the side of the end plate (1) away from the inner hole (5) is the second layer arranged horizontally, the transition surface (4) is the third layer arranged obliquely, the pin hole (3) is provided on the transition surface (4), and a countersunk hole (7) is provided on the transition surface (4) corresponding to the position of the pin hole (3) and sunken inwardly, and the position of the end plate (1) at the countersunk hole (7) is the fourth layer.

2. A precision casting balancing weight according to claim 1, characterized in that: A plurality of pin holes (3) pass through the surface of the end plate (1) or the counterweight block (2).

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