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CN-121976938-A - Vacuum pump noise reduction assembly for integrated full-frequency refrigerator

CN121976938ACN 121976938 ACN121976938 ACN 121976938ACN-121976938-A

Abstract

The invention discloses a vacuum pump noise reduction assembly for an integrated full-frequency refrigerator, belonging to the technical field of noise reduction of refrigeration equipment; the assembly comprises an upper shell, a lower shell, a vacuum pump, a vibration reduction installation mechanism and an airflow silencing system, wherein high-strength sound insulation is realized by adopting a nylon and glass fiber composite shell, asymmetric supporting feet with different heights are designed, and the movable clamping connection is realized by utilizing the clamping structure at the top ends of the supporting feet to be matched with the limiting structure of a damping seat at the bottom of the vacuum pump. The design enables the vacuum pump to be installed in an asymmetric suspension state, can be quickly locked or disassembled without additional fasteners, effectively isolates mechanical vibration and greatly improves assembly efficiency, constructs a three-stage serial silencing flow passage of a cavity silencer, an integrated silencing module and a powder metallurgy block, effectively eliminates pneumatic noise, eliminates vibration leakage through cable flexible sealing treatment, achieves full-frequency-band and high-efficiency noise reduction effect, and has the remarkable advantages of compact structure, light weight, low cost, convenience in installation, convenience in maintenance and the like.

Inventors

  • SUN PENGFEI
  • LIU HAO
  • WU BING
  • HUANG SHANSHAN
  • Gong Yurong

Assignees

  • 卡川尔流体科技(上海)有限公司
  • 珠海格力电器股份有限公司

Dates

Publication Date
20260505
Application Date
20260311

Claims (10)

  1. 1. The utility model provides an subassembly of making an uproar falls in vacuum pump for integrated full frequency channel refrigerator which characterized in that includes: an upper shell (1) and a lower shell (2) which are matched to form a containing cavity; a vacuum pump (3) disposed in the accommodation chamber; the vibration reduction mounting mechanism is arranged in the lower shell (2) and is used for supporting the vacuum pump (3) to be in a suspended state; the air flow silencing system comprises a silencer (4) and an integrated silencing module (5) which are arranged on the upper shell (1) or the lower shell (2), wherein the silencer (4) is communicated with the integrated silencing module (5) in series to form an air flow channel; the vibration reduction mounting mechanism comprises at least two supporting legs (6) arranged on the inner wall of the lower shell (2), and the heights of the supporting legs (6) are not completely consistent; the support legs (6) are connected with the shock absorbing seat (7) at the bottom of the vacuum pump (3) in a movable clamping mode, so that the vacuum pump (3) is installed in the lower shell (2) in an asymmetric suspension state, and the movable clamping mode is configured to realize quick installation locking or disassembly unlocking through direct matching of the support legs (6) and the shock absorbing seat (7) under the condition that no additional fastener is used.
  2. 2. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein the movable clamping mode specifically comprises the following steps that a clamping part or a barb structure extending inwards is arranged at the top end of each supporting leg (6), and a limit groove or a boss matched with the clamping part or the barb structure is arranged at a corresponding position of the side surface or the bottom surface of each damping seat (7); When the vacuum pump (3) is pressed into the lower shell (2) along the vertical direction, the clamping part or the barb structure is stressed to elastically deform and pass through the limit groove or the boss, and then the vacuum pump is reset and clamped into the limit groove or hooks the boss, so that the vacuum pump (3) is locked on the supporting legs (6).
  3. 3. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 2, wherein the supporting feet (6) are integrally injection molded on the lower shell (2) by elastic engineering plastics, or the supporting feet (6) are independent elastic plastic parts and are embedded in reserved hole sites of the lower shell (2).
  4. 4. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein the upper shell (1) and the lower shell (2) are both made of nylon and glass fiber composite materials through injection molding, a grid-shaped or radial reinforcing rib structure is arranged inside the shells, and a sealing ring (8) is embedded at the joint surface of the upper shell (1) and the lower shell (2).
  5. 5. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein the integrated noise reduction module (5) is arranged on one side of the lower shell (2), porous sound absorption materials are filled in the integrated noise reduction module, a vertical downward exhaust port is arranged at the bottom of the integrated noise reduction module, a detachable porous powder metallurgy block (9) is arranged at the exhaust port, and the porous powder metallurgy block (9) is fixed at the exhaust port through threaded connection or buckle connection or an elastic plug block and is used for carrying out final noise reduction on exhaust air flow.
  6. 6. The noise reduction assembly of the vacuum pump for the integrated full-band refrigerator according to claim 1, wherein an air inlet pipeline (10) of the vacuum pump (3) is directly integrated and fixed in a reserved hole site of the upper shell (1) or the lower shell (2), or is connected with a hard joint integrated with the shell, so that shaking noise generated by the pipeline is eliminated.
  7. 7. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein a motor outgoing line (11) of the vacuum pump (3) passes through an installation groove (12) formed in the side wall of the lower shell (2), a rubber tube is sleeved on a part passing through the installation groove (12) of the motor outgoing line (11), and sealing glue is filled in a gap of the installation groove (12), so that a flexible vibration isolation connection and a sealing structure are formed between the motor outgoing line (11) and the lower shell (2).
  8. 8. The noise reduction assembly for the vacuum pump for the integrated full-band refrigerator according to claim 1, wherein the silencer (4) is a cavity silencer or a filled silencer filled with sound absorbing materials, is fixedly arranged on a special mounting seat at the top of the upper shell (1) through screws, and is positioned right above or beside an air outlet of the vacuum pump (3).
  9. 9. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein an installation interface (13) for installing the whole assembly on the refrigerator body is arranged on the outer side of the bottom of the lower shell (2), and a secondary vibration reduction pad (14) is arranged at the installation interface (13) and used for blocking transmission of assembly vibration to the refrigerator body.
  10. 10. The vacuum pump noise reduction assembly for the integrated full-band refrigerator according to claim 1, wherein an additional sound insulation and absorption module (15) is further arranged on the inner wall of the upper shell (1) or the lower shell (2); The additional sound-insulating and absorbing module (15) is configured to be a porous structure filled in the airflow channel or a sound-insulating cotton layer attached to the inner wall of the accommodating cavity and used for further attenuating aerodynamic noise in the airflow channel or reverberation noise in the accommodating cavity.

Description

Vacuum pump noise reduction assembly for integrated full-frequency refrigerator Technical Field The invention relates to the technical field of noise control of refrigeration equipment and household appliances, in particular to a modularized noise reduction device integrating mechanical vibration reduction, airflow noise reduction, sound wave isolation and structure optimization, which is particularly suitable for solving the problem of broadband noise generated when a miniaturized high-rotation-speed vacuum pump operates in a closed or semi-closed space. Background With the increasing demands of consumers on food health and quality of life, the functions of refrigerators have been developed from simple low-temperature refrigeration to diversified preservation technologies. The vacuum preservation technology can obviously reduce the oxygen concentration, inhibit the propagation of aerobic bacteria and the oxidative deterioration of food, so that the preservation period of the food is prolonged, and the vacuum preservation technology has become one of the core competitiveness of the high-end refrigerator market. In vacuum preservation systems, the vacuum pump is a core power component that functions to pump out the air (mainly oxygen) in the preservation drawer or a specific compartment to maintain a set low oxygen environment. The typical household refrigerator vacuum pump is usually a small reciprocating piston pump or a rotary vane pump, and has the characteristics of small volume, high pumping speed, low power consumption and the like. However, such pumps inevitably generate noise during operation due to the high-speed reciprocation or rotation of the internal mechanically moving parts, and the periodic pulsations of the air flow. The noise sources of the vacuum pump are complex and can be mainly divided into the following categories: mechanical noise is caused by unbalance of a motor rotor, friction of a bearing, reciprocating impact of a piston or a blade, opening and closing impact of a valve and the like. Such noise is typically manifested as vibration noise at medium to low frequencies, with frequencies in the range of up to 50Hz to 500 Hz. The mechanical vibration not only generates air sound, but also can be transmitted to the refrigerator body through the mounting base, so that the refrigerator body is caused to resonate, and the noise influence is amplified. Pneumatic noise is a periodic pulsation originating from compression, expansion and gas inlet and outlet of gas in the pump chamber. When high-speed air flows through a narrow valve port or pipeline, turbulence and vortex are generated, and high-frequency noise is radiated. In addition, the air flow pulsation excites acoustic resonance of the pipe system, and howling of a specific frequency is generated. The frequency range of the pneumatic noise is wide, and can cover 500Hz to 5000Hz or even higher. Electromagnetic noise is electromagnetic waves generated by the interaction of magnetic fields between a motor stator and a motor rotor, so that a stator iron core and a machine shell vibrate and sound. Such noise typically has a significant characteristic frequency, which is related to motor speed and pole count. In such home appliances requiring very high silence in a refrigerator, noise of a vacuum pump often becomes one of main noise sources, particularly in a quiet night environment, a buzzing sound or a pyridazining sound of the vacuum pump is very likely to cause discomfort to a user, and sleeping quality and use experience are seriously affected. Aiming at the noise problem of the vacuum pump, the prior art mainly adopts the following noise reduction measures, but has obvious limitations: 1. And (3) passive wrapped sound insulation, namely, integrally wrapping the vacuum pump by using materials such as sound insulation cotton, sound absorption foam and the like, or filling porous sound absorption materials around the pump body. The porous sound absorbing material has good high-frequency noise absorbing effect, but has limited insulating capability on middle-low frequency mechanical noise, excessive wrapping can prevent the pump body from radiating, and the traditional sound insulating cotton is easy to age and pulverize and has reduced noise reducing effect after long-term operation. 2. And a simple rubber gasket is arranged between the vacuum pump base and the refrigerator mounting plate and is fastened by bolts. The natural frequency of the common rubber pad is fixed, the common rubber pad has a good isolation effect on vibration in a specific frequency range, a sound bridge is easy to form due to rigid connection of bolts, the vibration is directly transmitted, the installation procedure is complex, special tools are needed, the later maintenance and the disassembly are difficult, and rubber parts are easy to damage. 3. The thick steel plate sound-proof cover is made of metal plates and is closed or semi-closed. The weight and the mat