Nvh-optimized structure and electric compressor

Abstract

The utility model discloses NVH optimization structure and electric compressor, including cylinder, the cylinder one end outside is equipped with the air inlet, the cylinder is close to the one end of air inlet and is provided with electric control box casing, the cylinder is far away from the one end of electric control box casing and is provided with exhaust end cavity, one side of exhaust end cavity is equipped with the air outlet, the inboard or outboard fixed connection of cylinder has a plurality of axial even distribution's reinforcing rib board, the inside fixed connection of cylinder is close to exhaust end cavity one end has a plurality of axial radial even distribution's arc support board, the both ends symmetrical of arc support board are equipped with mounting fastening hole, through adopting 120 even distribution's arc support board, reinforcing rib board optimization and integrated casting process, has promoted structural strength, connection rigidity and vibration suppression ability, has optimized fluid path and has improved manufacturing process simultaneously, thereby strengthens the stability and durability of compressor operation.

Description

Technical Field

[0001] This utility model relates to the field of electric compressor technology, specifically to NVH optimization structure and electric compressor. Background Technology

[0002] An electric compressor is a device that uses electrical energy to drive a mechanical device to compress gases (such as air, refrigerants, etc.) to increase their pressure. Unlike traditional internal combustion engine-driven compressors, electric compressors use an electric motor as a power source and have advantages such as high efficiency, energy saving, low vibration, and precise control. They are widely used in new energy vehicles, refrigeration and air conditioning systems, industrial gas compression and other fields.

[0003] With the rapid popularization of electric vehicles, the electric compressor, as a key component, directly affects the comfort and reliability of the entire vehicle in terms of its NVH (noise, vibration, and harshness) performance. However, the cylinder structure of existing electric compressors has significant defects: on the one hand, the cylinder block's fixing strength to the motor is insufficient, which makes it easy to induce structural resonance during operation, especially under long-term high-load conditions, where motor vibration will further aggravate the loosening of the fixing structure; on the other hand, traditional cylinder blocks lack effective radial and axial reinforcement designs, resulting in insufficient overall rigidity and difficulty in suppressing vibration transmission.

[0004] Therefore, an NVH optimization structure and an electric compressor were proposed to address the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide an NVH optimized structure and an electric compressor to solve the problem mentioned in the background art that the cylinder structure of the existing electric compressor is prone to resonance and increased vibration during operation due to insufficient motor fixing strength and lack of effective radial and axial reinforcement design, which may even lead to functional failure in severe cases.

[0006] To achieve the above objectives, this utility model provides the following technical solution: NVH optimized structure and electric compressor, including a cylinder body, an air intake port is provided on the outer side of one end of the cylinder body, an electrical control box housing is provided on the end of the cylinder body near the air intake port, an exhaust end cavity is provided on the end of the cylinder body away from the electrical control box housing, and an exhaust port is provided on one side of the exhaust end cavity; The cylinder body has several axially uniformly distributed reinforcing ribs fixedly connected to its inner or outer side. Several arc-shaped support plates, evenly distributed axially and radially, are fixedly connected inside the cylinder near the exhaust end cavity. The two ends of the arc-shaped support plates are symmetrically provided with mounting and fastening holes.

[0007] Preferably, the number of reinforcing ribs is six, and they are evenly distributed along the radial direction of the cylinder.

[0008] Preferably, the number of the arc-shaped support plates is three, and they are evenly distributed at 120° along the circumference of the inner wall of the cylinder.

[0009] Preferably, the reinforcing rib is integrally cast with the cylinder body.

[0010] Preferably, a locking bolt for connection to the stator is provided in the mounting and fastening hole.

[0011] Preferably, the mounting fastening hole is a threaded through hole, and the locking bolt passes through the mounting fastening hole and is fastened to the stator flange surface.

[0012] Preferably, the connection between the arc-shaped support plate and the inner wall of the cylinder is provided with a cast rounded corner transition.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This NVH optimized structure and electric compressor, through the adoption of 120° evenly distributed arc-shaped support plates, optimized reinforcing ribs, and integrated casting process, improves structural strength, connection stiffness, and vibration suppression capability. At the same time, it optimizes the fluid path and improves the manufacturing process, thereby enhancing the stability and durability of the compressor operation. The specific details are as follows: 1. Improved structural strength and connection stiffness: By adjusting the traditional multi-point support structure to at least three arc-shaped support plates evenly distributed in a 120° circumferential direction, the structural strength of the stator connection part is enhanced; the mounting and fastening holes at both ends of the arc-shaped support plates, together with the locking bolts, form a rigid connection, which effectively improves the contact friction and motor connection stiffness, suppresses the structural vibration during compressor operation, and reduces the risk of fastener loosening.

[0014] 2. Vibration transmission suppression: Six radially equidistant reinforcing ribs are set on the inner or outer side of the cylinder body, and the natural frequency of the structure is changed by adjusting the mass distribution of the cylinder body, thereby reducing the probability of resonance between components.

[0015] 3. Fluid shock mitigation: The arc-shaped profile of the arc-shaped support plate and the inner wall of the cylinder are transitioned by cast rounded corners, which not only optimizes the refrigerant flow path, but also the design that its thickness is consistent with the cylinder wall thickness can disperse the refrigerant impact force under high flow rate conditions and reduce the noise caused by fluid excitation.

[0016] 4. Improved manufacturing process: The integrated casting process of the arc-shaped support plate and the cylinder body eliminates welding stress concentration points; at the same time, the installation fastening holes designed with threaded through holes realize double locking of the stator flange face, ensuring structural integrity under long-term high-load operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cylinder block structure in this utility model; Figure 3 This utility model Figure 2 A side view of the middle cylinder block; Figure 4 This is a schematic diagram of the front cross-sectional structure of the cylinder block of this utility model.

[0018] In the diagram: 1. Cylinder block; 101. Intake port; 2. Electrical control box housing; 3. Exhaust end cavity; 301. Exhaust port; 4. Reinforcing rib; 5. Arc-shaped support plate; 501. Mounting fastening hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0020] like Figure 1 As shown, the NVH optimization structure and electric compressor of this embodiment include a cylinder 1. An air intake 101 is provided on the outer side of one end of the cylinder 1. An electrical control box housing 2 is installed at one end near the air intake 101, and the other end is connected to the exhaust end cavity 3 (the exhaust port 301 is located on its side).

[0021] like Figure 1 and Figure 2 As shown, the outer circumferential surface of the cylinder 1 is integrally cast with 6 radially equally spaced reinforcing ribs 4 (the thickness of which is 1.2 times the thickness of the cylinder wall). The reinforcing ribs 4 extend axially to the bottom of the cylinder. The external reinforcing ribs 4 can improve the bending stiffness of the cylinder 1 and suppress cylinder resonance caused by refrigerant pulsation or motor vibration during compressor operation. At the same time, it is easy to cast and process without additional welding procedures.

[0022] like Figure 3 As shown, the inner wall of the cylinder body 1 near the exhaust end cavity 3 is provided with three evenly distributed arc-shaped support plates 5 at 120°, with the same thickness as the cylinder body wall thickness, and the connection is transitioned by rounded corners; the arc-shaped support plates 5 have threaded mounting and fastening holes 501 at both ends, which are connected to the stator flange face by locking bolts; the evenly distributed design of the arc-shaped support plates 5 can evenly disperse the electromagnetic excitation force transmitted by the stator and reduce high-frequency noise; the rounded corner transition reduces stress concentration and improves fatigue life. Example 2

[0023] The difference between this embodiment and embodiment 1 lies in the different placement of the reinforcing rib 4: the embedded reinforcing rib 4 saves external space and is suitable for compact compressors; the reinforcing rib 4 also serves as a flow guide structure for the refrigerant flow channel, optimizing the uniformity of refrigerant flow and reducing eddy noise. like Figure 3 As shown, the mounting and fastening hole 501 of the arc-shaped support plate 5 is changed to a countersunk hole, and the head of the locking bolt is embedded in the hole to avoid the protrusion interfering with the refrigerant flow. The countersunk design reduces the flow resistance and improves the compressor efficiency. Then, the cylinder mode is further improved by the synergistic effect of the arc-shaped support plate 5 and the reinforcing rib plate 4, which reduces the outward vibration transmission of the compressor.

[0024] Working principle: Before starting the electric compressor, it is necessary to check the overall condition of the device to ensure it can operate normally. Figure 1 - Figure 4 As shown, when the compressor is running, the airflow drawn in from the side of the cylinder 1 enters the cylinder 1 through the intake port 101, and the high-pressure gas is discharged from the exhaust port 301 during the process: a. The rotor unbalanced force is redistributed through the triangular constraint structure between the stator and the arc-shaped support plate 5; b. The gas pulsating pressure is absorbed and attenuated by the rigid unit segmented by the reinforcing rib 4; Meanwhile, a radial stiffness matrix is ​​formed by six reinforcing ribs 4 (preferably integrally cast) distributed at equal intervals along the outer circumference of the cylinder block 1. This design has two functions: c. The array of reinforcing ribs 4 divides the circumference of cylinder 1 into six rigid sectors, raising the natural frequency of housing 1 above the excitation frequency band and avoiding resonance; d. The reinforcing rib 4 serves as a point of sudden change in mechanical impedance, which can block the circumferential propagation path of vibration waves in the shell.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An NVH optimized structure and an electric compressor, comprising a cylinder (1), wherein an intake port (101) is provided on the outer side of one end of the cylinder (1), an electrical control box housing (2) is provided on the end of the cylinder (1) near the intake port (101), and an exhaust end cavity (3) is provided on the end of the cylinder (1) away from the electrical control box housing (2), wherein an exhaust port (301) is provided on one side of the exhaust end cavity (3), characterized in that: The cylinder body (1) has several axially uniformly distributed reinforcing ribs (4) fixedly connected to its inner or outer side. The cylinder (1) has several arc-shaped support plates (5) that are evenly distributed in the axial and radial directions fixedly connected to one end of the exhaust end cavity (3). The two ends of the arc-shaped support plates (5) are symmetrically provided with mounting and fastening holes (501).

2. The NVH-optimized structure and electric compressor of claim 1, wherein: The number of the reinforcing ribs (4) is six, and they are distributed at equal intervals along the radial direction of the cylinder body (1).

3. The NVH-optimized structure and electric compressor of claim 1, wherein: The number of the arc-shaped support plates (5) is three, and they are evenly distributed at 120° along the inner wall of the cylinder (1).

4. The NVH optimized structure and electric compressor of claim 2, wherein: The reinforcing rib (4) is integrally cast with the cylinder body (1).

5. The NVH-optimized structure and electric compressor of claim 1, wherein: The mounting fastening hole (501) is provided with a locking bolt that is connected to the stator.

6. The NVH-optimized structure and electric compressor of claim 5, wherein: The mounting fastening hole (501) is a threaded through hole, and the locking bolt passes through the mounting fastening hole (501) and is fastened to the stator flange surface.

7. The NVH optimized structure and electric compressor as claimed in claim 3, wherein: The arc-shaped support plate (5) is provided with a cast rounded corner transition at the connection between it and the inner wall of the cylinder (1).

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