WO2019114625A1

WO2019114625A1 - Vacuum pump vent pipe silencer and refrigerator having same

Info

Publication number: WO2019114625A1
Application number: PCT/CN2018/119773
Authority: WO
Inventors: 杨春; 陈建全; 张�浩; 夏恩品
Original assignee: 青岛海尔股份有限公司
Priority date: 2017-12-11
Filing date: 2018-12-07
Publication date: 2019-06-20
Also published as: US20210180581A1; AU2018386133A1; CN107989774A; EP3726055A1; EP3726055A4

Abstract

Provided is a silencer (300), comprising a hollow cavity jointly enclosed by a first bottom face (310), a second bottom face (320) and a side wall (330), wherein the side wall (330) is connected to the first bottom face (310) and the second bottom face (320); one end of the silencer (300) is provided with an air inlet (340), and the other opposite end is provided with an air outlet (350); the cavity is divided into a plurality of chambers in an axial direction, the chambers comprising a first chamber (361) adjacent to the first bottom face (310), a second chamber (363) adjacent to the second bottom face (320), and a middle chamber (362) located between the first chamber (361) and the second chamber (363); the air inlet (340) is in air communication with the middle chamber (362); the middle chamber (362) is in air communication with the second chamber (363); the first chamber (361) is in air communication with the second chamber (363); and the air outlet (350) is in air communication with the first chamber (361). The silencer (300) further comprises a first guide pipe (371), a second guide pipe (372), a third guide pipe (373) and a fourth guide pipe (374), wherein the air inlet (340) is in communication with the middle chamber (362) via the first guide pipe (371), the middle chamber (362) is in communication with the second chamber (363) via the second guide pipe (372), the first chamber (361) is in communication with the second chamber (363) via the third guide pipe (373), and the first chamber (361) is in communication with the air outlet (350) via the fourth guide pipe (374); and the first guide pipe (371), the second guide pipe (372), the third guide pipe (373) and the fourth guide pipe (374) are configured to be successively arranged in the direction of an air path.

Description

[Name of invention made by ISA according to Rule 37.2] Vacuum pump exhaust pipe silencer and refrigerator

The present application claims the priority of the Chinese patent application entitled "vacuum pump exhaust pipe silencer and refrigerator" on the application date of December 11, 2017, the application number is 201711311262.X, the entire contents of which are incorporated herein by reference. In the application.

Technical field

The invention belongs to the technical field of noise reduction of refrigeration equipment, and particularly relates to a silencer for reducing the noise of a vacuum pump.

Background technique

The preservation of food in the refrigerator is closely related to temperature, humidity and gas environment. Among them, oxygen is an important factor causing food spoilage and bacterial reproduction. Controlling the nitrogen to oxygen ratio of the refrigerator by aspirating the oxygen in the chamber can significantly extend the freshness of the food.

Oxygen can be extracted from a specific space by a vacuum pump and discharged to the outside of the refrigerator. However, as a medium for conducting sound, gas will conduct noise in the box to the outside space of the refrigerator during the discharge process, causing noise interference.

Summary of the invention

It is an object of the present invention to provide a muffler to solve the problem of vacuum pump noise output.

In order to achieve the above object, the present invention provides a muffler comprising a hollow cavity formed by a first bottom surface, a second bottom surface and a side wall, the side wall connecting the first bottom surface and the second bottom surface, and the muffler end The air inlet is disposed, and the air outlet is disposed opposite to the other end, the cavity is divided into a plurality of chambers in the axial direction, the chamber includes a first chamber adjacent to the first bottom surface, and a second chamber adjacent to the second bottom surface And an intermediate chamber between the first chamber and the second chamber, the air inlet is electrically connected to the intermediate chamber, and the intermediate chamber is electrically connected to the second chamber, the first chamber and the second chamber The gas is turned on, and the gas outlet is electrically connected to the first chamber gas.

As a further improvement of an embodiment of the invention, at least part of the chamber volume is different.

As a further improvement of an embodiment of the present invention, the muffler further includes a first conduit, a second conduit, a third conduit, and a fourth conduit, the first conduit conducting the inlet and the intermediate chamber, and the second conduit conducting the intermediate chamber The chamber and the second chamber, the third conduit conducts the first chamber and the second chamber, and the fourth conduit conducts the first chamber and the air outlet.

As a further improvement of an embodiment of the present invention, the first duct, the second duct, the third duct, and the fourth duct are configured to be sequentially arranged in the air path direction.

As a further improvement of an embodiment of the invention, the intermediate chamber is at least one.

To achieve the above object, an embodiment of the present invention provides a muffler including a housing, the housing enclosing a hollow cavity, the proximal end of the housing is provided with an air inlet, and the distal end of the housing is configured with an air outlet, the cavity The body is divided into a plurality of chambers from the proximal end to the distal end, the chamber including a first chamber located opposite the proximal end, a second chamber located opposite the distal end, and the first chamber and the second chamber In the intermediate chamber, the gas inlet and the intermediate chamber are in gas conduction, the intermediate chamber and the second chamber are in gas conduction, the first chamber and the second chamber are gas-conducting, and the gas outlet and the first chamber gas are Turn on.

In order to achieve the above object, an embodiment of the present invention provides a refrigerator including a sealed casing containing a vacuum pump, including any of the above mufflers, and a vacuum pump connected to the muffler.

Compared with the prior art, the refrigerator vacuum pump muffler provided by the invention realizes the attenuation of sound waves through the multi-cavity and the circulation arrangement of the conduits, reduces the sound energy, and prevents the noise of the vacuum pump and the box from being transmitted to the outside of the box.

DRAWINGS

1 is a schematic structural view of a sealed casing according to an embodiment of the present invention;

2 is a schematic view of components inside and outside the sealed case according to an embodiment of the present invention;

Figure 3 is a plan view of a sealed casing according to an embodiment of the present invention;

4 is a schematic exploded view of a sealed casing according to an embodiment of the present invention;

Figure 5 is a front elevational view of a sealed casing according to an embodiment of the present invention;

Figure 6 is a plan view of a sealing member in accordance with an embodiment of the present invention;

Figure 7 is a schematic structural view of a sealing member according to an embodiment of the present invention;

Figure 8 is a plan view of a lower sealing body in an embodiment of the present invention;

9 is a schematic view showing the installation of an upper sealing body and a metal plate according to an embodiment of the present invention;

Figure 10 is a schematic view showing the structure of a lower sealing body in an embodiment of the present invention;

Figure 11 is a schematic exploded view of Figure 10;

Figure 12 is a perspective schematic view of a muffler according to an embodiment of the present invention;

Figure 13 is a perspective schematic view of a muffler in still another embodiment of the present invention;

Figure 14 is a schematic view showing the structure of a vacuum pump and a muffler according to still another embodiment of the present invention;

Figure 15 is a schematic structural view of a muffler according to still another embodiment of the present invention;

Figure 16 is a perspective view of a muffler in still another embodiment of the present invention;

Figure 17 is a schematic longitudinal cross-sectional view showing a muffler in still another embodiment of the present invention.

Detailed ways

The invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, the embodiments are not intended to limit the invention, and the structural, method, or functional changes made by those skilled in the art in accordance with the embodiments are included in the scope of the present invention.

The words expressing position and orientation described in the present invention are all referenced to a vacuum pump, one end near the vacuum pump being the proximal end, and the end remote from the vacuum pump being the distal end.

Referring to FIGS. 1 to 3, in an embodiment of the present invention, the vacuum pump 100 is housed in the sealed casing 200, and is electrically connected to the outside air through the intake pipe 210 and the outlet pipe 220. The proximal end of the intake pipe 210 is connected to the intake pipe of the vacuum pump 100, and the distal end is connected with the fresh-keeping space (not shown) in the refrigerator compartment; the proximal end of the air outlet pipe 220 is connected to the outlet pipe of the vacuum pump 100, and the distal end is sealed to the sealed box. The body 200 extends outside. The sealed casing 200 blocks the gas communication between the vacuum pump 100 and the installation environment to achieve the sound insulation effect. The fresh-keeping space can be a separate compartment or a closed or semi-enclosed space located locally in the compartment.

The sealed casing 200 includes an upper sealing body 230 and a lower sealing body 240. The upper sealing body 230 includes an integrally formed top wall and side walls, which together define a receiving cavity for the lower end opening. The lower sealing body 240 includes an integrally formed bottom wall and side walls, which together define an upper opening receiving cavity, upper and lower seals. The openings of the body 240 are matched to each other to form an accommodation space of the vacuum pump 100.

Preferably, the upper sealing body 230 and the lower sealing body 240 are made of plastic material.

Referring to FIG. 4, a seal is disposed between the upper sealing body 230 and the lower sealing body 240. The lower edge of the sidewall of the upper sealing body 230 forms a first groove, and the upper edge of the sidewall of the lower sealing body 240 forms a second groove, and the first groove cooperates with the second groove to form a mounting groove of the sealing ring 250, In this way, the airtightness of the upper sealing body 230 and the lower sealing body 240 after engagement can be ensured, and the sound can be prevented from being transmitted from the splicing gap of the sealed casing 200. The sealing ring 250 has an annular shape and has a circular cross section, and is made of an elastic material. The mounting tensile amount when the sleeve is sleeved in the mounting groove is 2-5%. When the upper sealing body 230 and the lower sealing body 240 are engaged, The sealing ring 250 applies pressure to form a compression amount of 20-30%, thus ensuring a sealing effect.

4 and 5 show a notch portion 251 at the joint of the upper sealing body 230 and the lower sealing body 240 for threading the wire connecting the vacuum pump 100. In order to ensure the sealing of the sealed casing 200, a sealable seal ring 253 is provided in the notch portion 251. The seal ring 253 is made of an elastic material and integrally formed with the seal ring 250.

Referring to Figures 6 and 7, the seal ring 253 is composed of two H-shaped members that are flexibly connected, and the H-shaped members can be engaged with each other to form a mounted state in cooperation with the notch portion 251. The H-shaped member has a first arm 2531 and a second arm 2532 that are parallel to each other, and a connecting portion 2533 that connects the first arm 2531 and the second arm 2532. The first arm 2531 and the second arm 2532 can cooperate to sandwich the side wall of the casing at the edge of the notch portion 251 to prevent the seal ring 253 from coming off the notch portion 251. The connecting portion 2533 connects the first arm 2531 and the second arm 2532 through the notch portion. The connecting portion 2533 has a concave curved surface. When the H-shaped members are engaged with each other, their curved surfaces are collectively enclosed to form a hollow cavity for the wire to pass through.

In the case where a plurality of wires pass through the notch portion 251, if the wire portion is circular as a whole, since the wire cross section is circular, the gap formed between the wires reduces the sealing property. In this case, the curved surface of the connecting portion 2533 may be wavy (not shown) to form a plurality of mutually independent hollow cavities in the mounted state to better seal the wire of the circular cross section.

Referring to FIG. 8, a plurality of metal plates 260 are disposed in the sealed casing 200. The metal plates 260 are disposed between the vacuum pump 100 and the side walls of the sealed casing 200. Due to the high density of the metal plate 260, the sound passage is blocked, and the noise reduction effect can be achieved.

Preferably, the metal plate 260 is an aluminum plate, a steel plate or a galvanized plate.

Referring to FIG. 8 and FIG. 9, in an embodiment of the present invention, the metal plate 260 is two pieces, which are respectively disposed on opposite walls of the sealed box body 200. The lower sealing body 240 and the upper sealing body 230 are respectively provided with a limiting structure to fix the

metal plates

260a, 260b.

8 shows a first rib 242 of the bottom wall of the lower sealing body 240 disposed parallel to the side wall 241 and spaced apart by a distance d, and a second rib 244 parallel to the side wall 243 and spaced apart by a distance D, wherein the side wall 241 is The side walls 243 are opposed to each other, d is the thickness of the metal plate 260a, and D is the thickness of the metal plate 260b. The spacing between the first rib 242 and the sidewall 241 forms a limiting slot of the metal plate 260a, and the spacing between the second rib 244 and the sidewall 243 forms a limiting slot defining the metal plate 260b, respectively defining the

metal plates

260a, 260b in the horizontal direction. Displacement.

Referring to FIG. 8 and FIG. 10, the lower sealing body 240 is further provided with a plurality of guiding grooves 245 extending in a vertical direction extending in the same direction as the insertion direction of the metal plate 260 when the metal plate 260 is mounted, and the guiding metal plate 260 is mounted to the preset. s position.

FIG. 9 shows that the upper sealing body 230 is provided with a plurality of resisting members 231. When the upper sealing body 230 and the lower sealing body 240 are covered, the resisting member 231 abuts against the top of the metal plate 260. One end of the resisting member 231 in contact with the metal plate 260 is provided with a step portion 2311, and the side wall of the upper sealing body 230 is fitted to form an inverted U-shaped space to accommodate the top of the metal plate 260. The top surface of the step portion 2311 abuts against the top surface of the metal plate 260, and its displacement in the vertical direction can be defined. The side surface of the step portion abuts against the side surface of the metal plate 260, and the displacement in the horizontal direction can be limited.

The metal plate 260 is disposed in close contact with the side wall of the sealed casing 200, and the vibration of the vacuum pump 100 may cause the metal plate 260 to resonate, forming new noise and conducting outward through the wall of the sealed casing 200. The above-mentioned limit structure strictly defines the position of the metal plate 260 to avoid resonance and generate noise.

In an embodiment of the invention, one of the upper sealing body 230 or the lower sealing body 240 or the joint portion of the upper sealing body 230 and the lower sealing body 240 is provided with a notch portion 246 for piercing the air pipe assembly.

10 and 11 exemplarily show a case where the notch portion 246 is provided to the lower sealing body 240. The notch portion 246 is formed on the side wall of the lower sealing body 240 near the upper edge, and the notch portion 246 is provided with a groove at the periphery to accommodate the sealing unit 270 to ensure the airtightness of the sealed casing 200. The sealing unit 270 is an annular structure of an elastic material.

The air tube assembly includes an integrally formed intake pipe 210, an air outlet pipe 220, and a base plate. The intake pipe 210 and the air outlet pipe 220 are bored on the substrate, and the outer edge of the substrate is matched with the shape of the notch portion 246. The outer edge of the substrate is provided with a groove, and the rib of the periphery of the notch portion 246 is matched, and the substrate can be clamped and fixed to the notch portion by the cooperation of the two, and the sealing unit 270 is embedded in the gap between the two.

The accommodating chamber in which the vacuum pump 100 is located is compact, which is disadvantageous for the connection and the piercing operation of the gas line. By arranging the air tube assembly as the insert structure, it can be conveniently embedded in the notch portion 246 after the connection with the vacuum pump 100 is completed, and then the upper and lower sealing bodies 240 are fastened to complete the assembly.

The gas of the air outlet pipe 220 is silenced and discharged to the outside of the refrigerator. Referring to Figures 1 and 12, in an embodiment of the invention, vacuum pump 100 is coupled to muffler 300 via an air outlet tube 220. The muffler 300 includes a housing. The housing is enclosed by a first bottom surface 310 at the proximal end, a second bottom surface 320 at the distal end, and a side wall 330 connecting the first bottom surface 310 and the second bottom surface 320 to form a cylindrical hollow body. An air inlet 340 connected to the air outlet tube 220 is disposed at a proximal end of the silencer 300, and an air outlet 350 is disposed at a distal end. The cavity is divided into a plurality of chambers in the axial direction, that is, from the air inlet 340 to the air outlet 350, and at least part of the chambers are different in volume to correspondingly eliminate sounds of different frequency bands. Illustratively, the volume of each chamber gradually decreases in the axial direction.

Preferably, the chambers are three, and the first chamber 361, the intermediate chamber 362 and the second chamber 363 are sequentially from the proximal end to the distal end. The first chamber 361 is adjacent to the first bottom surface 310, the second chamber 363 is adjacent to the second bottom surface 320, and the intermediate chamber 362 is located between the first chamber 361 and the second chamber 363. The first duct 371 is connected to the air inlet 340 and the intermediate chamber 362, the second duct 372 is connected to the intermediate chamber 362 and the second chamber 363, and the third duct 373 is connected to the first chamber 361 and the second chamber 363. The fourth conduit 374 turns on the first chamber 361 and the air outlet 350.

The intermediate chamber 362 can be a plurality.

The shape of the muffler housing is not limited to a cylindrical shape, and may be set to a rectangular parallelepiped shape or an irregular outer shape.

The sound waves transmitted from the vacuum pump 100 sequentially pass through the first duct 371, the second duct 372, the third duct 373, and the fourth duct 374 with the airflow, in the intermediate chamber 362, the second chamber 363, and the first chamber having different volumes. In 361, the reflection and refraction are sequentially performed, and the energy is gradually eliminated. The first chamber 361, the intermediate chamber 362, and the second chamber 363 correspond to a low, medium, and high frequency. Moreover, the first duct 371, the second duct 372, the third duct 373, and the fourth duct 374 are provided with a narrow inner diameter such that part of the energy is converted into heat energy by the passage of the sound wave.

The silencer is set such that the sound waves are cut through the longest stroke in the silencer to reduce energy and achieve refraction and reflection in different chambers, with a smaller silencer axial distance for better noise reduction.

Referring to Figure 13, in yet another embodiment of the present invention, the muffler 400 includes a housing. The housing is enclosed by a first bottom surface 410 at the proximal end, a second bottom surface 420 at the distal end, and a side wall 430 connecting the first bottom surface 410 and the second bottom surface 420 to form a cylindrical hollow body. A single chamber is formed within the cavity. An air inlet 440 connected to the air outlet tube 220 is disposed at a proximal end of the silencer 400, and an air outlet 450 is disposed at a distal end. The first conduit 471 conducts the air inlet 440 and the chamber, and the distal end of the first conduit 471 is adjacent to the second bottom surface 420. The second conduit 472 conducts the chamber and the air outlet 450, and the proximal end of the second conduit 472 is adjacent to the first bottom surface 420.

The sound waves are reflected and refracted in the chamber, and the energy is gradually digested. The length of the first conduit 471 and the second conduit 472 is a quarter wavelength of the intended audio to specifically cancel the sound of the intended audio. Preferably, the destination audio is 1000 Hz.

The first duct 471 and the second duct 472 are provided with a narrow inner diameter such that part of the energy is converted into heat energy by the passage of sound waves.

Among the noises transmitted by the vacuum pump 100 gas, the high frequency noise cannot be heard by the human ear, and the main interference to the user is low frequency noise. In this embodiment, the low frequency noise can be eliminated in a targeted manner, and the structure of the muffler is made simpler.

Referring to FIGS. 14 and 15, in another embodiment of the present invention, the muffler 500 is disposed inside the sealed casing 200, and is connected to the outlet pipe and the outlet pipe 220 of the vacuum pump 100. The muffler 500 includes a housing that encloses a hollow cavity for refraction and reflection of sound waves. The hollow cavity body includes a cylindrical cavity 510 and a rectangular parallelepiped cavity 520, wherein one of the bottom surfaces of the cylindrical cavity 510 is connected to a face 521 of the rectangular parallelepiped cavity 520, and the cylindrical cavity 510 is guided to the inside of the rectangular parallelepiped cavity 520. through.

The diameter of the bottom surface of the cylindrical chamber 510 is less than or equal to the side length of the connecting surface 521 of the rectangular parallelepiped chamber 520.

The cylindrical chamber 510 of the muffler 500 is provided with an air inlet 540 and an air outlet 550. The air inlet 540 is disposed at an angle with the air outlet 550 to allow the gas to enter the hollow cavity and then reflect and refract to the air outlet. The energy loss occurs to achieve the purpose of silence.

Preferably, the air inlet 540 is disposed on the bottom surface 511 of the cylindrical chamber 510, and the air outlet 550 is disposed on the side of the cylindrical chamber 510.

The air inlet 540 is the same as the inner diameter of the air outlet 550 to balance the pressure of the two ports.

In this embodiment, the acoustic wave is irregularly reflected and refracted by the change of the shape of the hollow cavity, and the energy is digested.

Referring to Figures 16 and 17, in still another embodiment of the present invention, the muffler 600 includes a housing that encloses a hollow cavity. The air vent 650 is disposed at a proximal end of the muffler 600, and the air outlet 650 is disposed at a distal end. The air inlet 640 and the air outlet 650 are communicated by a conduit 670 disposed in the housing. The conduit 670 forms a sleeve structure with the housing. The conduit 670 is filled with a medium to absorb the vibrational energy of the acoustic wave and attenuate the sound intensity. Further, the medium is a sound-absorbing cotton.

A plurality of through holes 680 are defined in the side wall of the conduit 670 to enable the conduit 670 to be electrically connected to the cavity. The through holes 680 are circumferentially spaced along the sidewall of the conduit 670, that is, the conduit 670 opens through holes in a plurality of directions.

Preferably, the housing is enclosed by a first bottom surface 610 at the proximal end, a second bottom surface 620 at the distal end, and a side wall 630 connecting the first bottom surface 610 and the second bottom surface 620 to form a cylindrical hollow body. The first bottom surface 610 is provided with an air inlet 640, and the second bottom surface 620 is provided with an air outlet 640.

Preferably, the through hole diameter is less than 1 mm.

Preferably, the cavity formed by the enclosure is divided into a plurality of chambers arranged from the proximal end to the distal end.

The sound waves from the vacuum pump 100 enter the duct 670 from the air inlet 640, and are silenced by the medium to reach the air outlet 650. The sound waves of a specific frequency are attenuated, and the sound intensity is weakened. During this process, part of the sound wave is diffracted into the cavity through the through hole 680, and is further attenuated by being refracted and reflected in the cavity.

The muffler is set up in such a way that the medium is silenced and the cavity is silenced, and the small holes are used to realize the diffraction of the sound wave, and the sound intensity is reduced in multiple ways.

It should be understood that, although the description is described in terms of embodiments, the embodiments are not intended to be construed as a single. The technical solutions in the embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions set forth above are merely illustrative of the possible embodiments of the present invention, and are not intended to limit the scope of the present invention. Changes are intended to be included within the scope of the invention.

Claims

A muffler, comprising: a hollow cavity formed by a first bottom surface, a second bottom surface and a side wall; the side wall connecting the first bottom surface and the second bottom surface, wherein the muffler is disposed at one end a gas port having an air outlet disposed opposite to the other end, the cavity being axially partitioned into a plurality of chambers, the chamber including a first chamber adjacent to the first bottom surface and a second adjacent to the second bottom surface a chamber and an intermediate chamber between the first chamber and the second chamber, the air inlet is electrically connected to the intermediate chamber, and the intermediate chamber is electrically connected to the second chamber, the first A chamber is in gas communication with the second chamber, and the gas outlet is electrically connected to the first chamber.
The muffler of claim 1 wherein at least a portion of said chambers have different volumes.
The muffler according to claim 1, further comprising a first duct, a second duct, a third duct, and a fourth duct, the first duct conducting the air inlet and the intermediate chamber, and the second duct is conducting The intermediate chamber and the second chamber, the third conduit conducts the first chamber and the second chamber, and the fourth conduit conducts the first chamber and the air outlet.
The muffler according to claim 3, wherein the first duct, the second duct, the third duct, and the fourth duct are arranged to be sequentially arranged in the air path direction.
A muffler according to claim 1 wherein said intermediate chamber is at least one.
A muffler includes a housing, wherein the housing encloses a hollow cavity, a proximal end of the housing is configured with an air inlet, and a distal end of the housing is configured with an air outlet, The cavity is divided into a plurality of chambers from the proximal end to the distal end, the chamber including a first chamber located opposite the proximal end, a second chamber located opposite the distal end, and a first chamber and a second chamber An intermediate chamber between the chambers, the inlet port is in gas communication with the intermediate chamber, the intermediate chamber is in gas communication with the second chamber, and the first chamber is electrically connected to the second chamber The gas outlet is electrically connected to the first chamber.
A muffler according to claim 6 wherein at least a portion of said chambers have different volumes.
The muffler according to claim 6, further comprising a first duct, a second duct, a third duct, and a fourth duct, the first duct conducting the air inlet and the intermediate chamber, and the second duct is conducting The intermediate chamber and the second chamber, the third conduit conducts the first chamber and the second chamber, and the fourth conduit conducts the first chamber and the air outlet.
The muffler according to claim 3, wherein the first duct, the second duct, the third duct, and the fourth duct are arranged to be sequentially arranged in the air path direction.
A refrigerator comprising a sealed casing containing a vacuum pump, characterized by further comprising the muffler according to claim 1, the vacuum pump being connected to a muffler.