CN215383488U - Low-noise food processor - Google Patents

Abstract

The utility model relates to the field of food processing machines, and discloses a low-noise food processing machine which comprises a host machine and a processing cup assembly detachably arranged on the host machine, wherein the processing cup assembly comprises a cup body, a cup seat and a cutter head assembly arranged between the cup body and the cup seat, the cutter head assembly comprises a cutter shaft, a heating disc clamped between the cup body and the cup seat and a bearing assembly fixed on the heating disc for mounting the cutter shaft, a heat insulation cover is arranged below the heating disc, the heat insulation cover is provided with a through hole for the cutter shaft to pass through, one end of the cutter shaft passing through the through hole is provided with a connector, the connector can axially cover the through hole, and a first noise reduction cavity surrounding the bearing assembly is formed between the heating disc and the heat insulation cover through a first blocking rib. The food processor solves the problem of excessive noise caused by impact of the stirring knife on the bearing assembly due to assembly errors, and improves the use experience of users.

Description

Low-noise food processor

Technical Field

The utility model relates to the field of food processing machines, in particular to a low-noise food processing machine.

Background

Food processors are currently being used more and more. The existing heating type food processor is generally provided with a main machine and a processing cup assembly which is detachably arranged. When the machine works, the motor assembly arranged inside the main machine rotates and drives the stirring knife arranged in the cup body assembly to rotate through the power transmission part, so that the food material is cut, the stirring and crushing purposes are realized, and the food is eaten by a user conveniently.

However, due to reasons such as assembly errors, the coaxiality and the perpendicularity of the stirring knife and the motor have large errors, so that when the machine works, the stirring knife rotates unevenly, impacts a bearing assembly and the like to generate large noise, the noise is transmitted to the outside through an assembly structure gap between the host and the processing cup assembly, and the experience of consumers is reduced.

Disclosure of Invention

In order to solve one or more technical problems in the prior art, or at least provide a beneficial choice, the utility model provides a low-noise food processor, which solves the problem of excessive noise caused by impact of a stirring knife on a bearing assembly due to assembly error, and improves the use experience of users.

The utility model discloses a low-noise food processing machine which comprises a host machine and a processing cup assembly detachably arranged on the host machine, wherein the processing cup assembly comprises a cup body, a cup seat and a cutter head assembly arranged between the cup body and the cup seat, the cutter head assembly comprises a cutter shaft, a heating disc clamped between the cup body and the cup seat and a bearing assembly fixed on the heating disc for mounting the cutter shaft, a heat insulation cover is arranged below the heating disc, the heat insulation cover is provided with a through hole for the cutter shaft to pass through, one end of the cutter shaft passing through the through hole is provided with a connector, the connector can axially cover the through hole, and a first noise reduction cavity surrounding the bearing assembly is formed between the heating disc and the heat insulation cover through a first blocking rib.

According to the food processor, on the basis of the structure of the existing heat shield, the through hole of the heat shield is axially covered by the connector of the cutter shaft, in addition, the first blocking rib is arranged between the heating disc and the heat shield, the connector, the heating disc and the first blocking rib form a surrounding for the bearing assembly, so that a noise reduction cavity, namely a first noise reduction cavity is formed. The first noise reduction cavity surrounding the bearing assembly is utilized to reduce noise, the propagation path of sound waves is prolonged, the sound waves are reflected and refracted for many times among the heating plate, the heat insulation cover and the first blocking rib, sound energy is attenuated, and the sound transmitted to the outside is reduced, so that noise is reduced. The experience is better for the user of the food processor.

In a preferred embodiment of the low-noise food processor, the first retaining rib is arranged on the heat shield, and a gap between the first retaining rib and the heat-generating plate forms a first diameter-changing section. First fender muscle is formed by the upper surface of heat exchanger towards the arch of dish that generates heat, first fender muscle is not the butt in the lower surface of dish that generates heat, and with the dish that generates heat between have the clearance to form first reducing section, this reducing structure makes and falls the sudden change department that there is the sound wave propagation path cross-section in the first chamber of making an uproar and outside, arouses the change of impedance and takes place reflection, interference of sound wave among the sound propagation process, take place the resistance decay to reduce by the first outside radiant sound energy of the chamber of making an uproar, play the effect of making an uproar.

In a preferred embodiment of the low-noise food processor, the heat shield forms a radial closing structure at the first rib. The radial closing-in structure is formed below the bearing component, the connecting head is located below the radial closing-in structure, and in the axial direction, overlapping sections are arranged between the bearing component and the radial closing-in structure as well as between the radial closing-in structure and the connecting head. The overlapping section can be added with a reflecting surface, and sound waves are reflected and interfered for multiple times on the surface of the overlapping section, so that the noise reduction effect can be improved. Moreover, the size of the through hole is reduced by the radial closing-up structure, so that the size of the connector is reduced, and the weight of the whole machine can be reduced.

In a preferred implementation of the low-noise food processor, a second noise reduction cavity communicated with the first noise reduction cavity through the first variable diameter section is further arranged between the heating plate and the heat shield. The second noise reduction cavity and the first noise reduction cavity form a multi-stage noise reduction structure, and sound waves are transmitted and refracted in the second noise reduction cavity again to weaken sound energy. Due to different frequency bands of the sound waves, under the condition that the volumes of the cavities are different, the sound wave energy of different frequency bands can be weakened. Meanwhile, when the sound waves are transmitted to the second noise reduction cavity through the first diameter-changing section, the cross section of the sound wave propagation path changes suddenly again, so that reactive attenuation occurs, and further noise reduction is realized.

In a preferred realization of the low-noise food processor, the second noise-reducing chamber surrounds the first noise-reducing chamber, and one or more second retaining ribs which reflect the outgoing sound waves are arranged in the second noise-reducing chamber. The reflecting surface can be increased by arranging the second blocking rib, so that the sound waves are reflected for multiple times in the second noise reduction cavity and are attenuated.

In a preferred embodiment of the low-noise food processor, a second diameter-changing section is formed between the cup base and the second rib. When the sound wave is transmitted to the outside from the second noise reduction cavity, the section of the sound wave propagation path changes suddenly again through the gap between the cup base and the second blocking rib, and resistance attenuation occurs.

In a preferred embodiment of the low-noise food processor, a third noise reduction chamber is provided between the cup holder and the heat shield, said third noise reduction chamber being in communication with the second noise reduction chamber via a second reducer section. The third noise reduction cavity, the second noise reduction cavity and the first noise reduction cavity form a multi-stage noise reduction structure, and sound waves are emitted and refracted again in the third noise reduction cavity to weaken sound energy.

In a preferred embodiment of the low-noise food processor, the cup base is provided with an extension which overlaps the second stop rib in the radial direction, the second diameter-changing section being formed between the extension and the second stop rib. The forming position of the second variable diameter section is further limited, the extending part can increase the reflection surface of the sound wave in the radial direction, the transmission path of the sound wave is prolonged, and the noise reduction effect is achieved.

In a preferred embodiment of the low-noise food processor, the first and second ribs have a plurality of reflecting surfaces in axial and radial directions. The structure that the muscle design all is equipped with the reflection surface for axial and radial will keeping off, for example keep off muscle design for multistage step shape structure with first fender muscle and second, not only increased the reflection surface, the sound wave also can reflect between radial plane of reflection and axial plane of reflection moreover, has further improved the noise reduction effect.

In a preferred embodiment of the low-noise food processor, the volume of the first noise-reducing chamber is V1, the volume of the second noise-reducing chamber is V2, and V2 > V1. Through setting up the expansion cavity of different volumes for the second falls the chamber of making an uproar and falls the chamber formation multistage structure of making an uproar with first, thereby can reduce the noise of different frequency channels. The volumes of the first noise reduction cavity and the second noise reduction cavity are gradually increased, so that sound energy is released step by step, and the condition that the noise in a certain direction is increased due to the gathering of the sound energy is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic diagram of a food processor according to an embodiment of the present invention;

FIG. 2 is an exploded view of a processing cup assembly in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a heat shield according to an embodiment of the present invention;

FIG. 4 is a top view of a processing cup assembly in accordance with an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is an enlarged view at C of FIG. 5;

FIG. 7 is a cross-sectional view taken at B-B of FIG. 4;

fig. 8 is an enlarged view at D in fig. 7.

Description of reference numerals:

1. a host;

2. processing the cup assembly; 21. a cup body; 22. a cup holder; 221. a housing; 222. an inner support; 223. an extension portion; 23. a cup cover; 24. a cutter head assembly; 241. a cutter shaft; 242. a heating plate; 243. a bearing assembly; 244. a connector; 25. a seal ring; 26. a heat shield; 261. mounting a boss; 262. a through hole; 263. a first barrier rib; 264. a radial necking structure; 265. a second rib; 27. a noise reduction cavity; 271. a first noise reduction cavity; 272. a second noise reduction cavity; 273. a third noise reduction cavity; 28. a first variable diameter section; 29. a second variable diameter section.

Detailed Description

In order to more clearly explain the overall concept of the present invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

In addition, in the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. However, the direct connection means that the two bodies are not connected through a transition structure, but connected through a connection structure to form a whole. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The specific scheme is as follows:

the utility model discloses a low-noise food processor, which comprises a host 1 and a processing cup assembly 2 detachably arranged on the host 1, wherein the processing cup assembly 2 comprises a cup body 21, a cup seat 22, a cutter head assembly 24 arranged between the cup body 21 and the cup seat 22, and a cup cover 23 covering the cup body 21, as shown in figures 1-5. In the cup 21 subassembly, sealing washer 25 cover is established in the outside of blade disc subassembly 24 and from top to bottom assembles the top at cup 22, and cup 21 is screwed in the cup 22 top and is compressed tightly sealing washer 25 simultaneously through the screw, is provided with the handle in one side of cup 21, makes things convenient for the consumer to take.

The cutter head assembly 24 includes an arbor 241, a heat generating plate 242 sandwiched between the cup body 21 and the cup holder 22, and a bearing assembly 243 fixed to the heat generating plate 242 to mount the arbor 241. The cutter shaft 241 extends into the cup body 21 and is connected with a stirring cutter, a high-speed rotating motor is arranged in the main machine 1, and an output shaft of the motor is connected with the cutter shaft 241 and drives the stirring cutter to do high-speed rotating motion so as to crush food materials in the processing cavity.

The heat shield 26 is arranged below the heating plate 242, the cup holder 22 comprises an outer shell 221 and an inner support 222, a threaded hole is formed in the lower end of the inner support 222, a mounting boss 261 is formed by upward protruding at the outer edge of the heat shield 26, and the heat shield 26 is fastened below the cup holder 22 from bottom to top through fastening screws and synchronously compresses the upper coupler. The heat shield 26 is provided with a through hole 262 for the knife shaft 241 to pass through, the central region of the heat shield 26 protrudes upwards to form a mounting cavity for mounting the connector 244, and one end of the knife shaft 241 passing through the through hole 262 is provided with the connector 244 for connecting with an output shaft of a motor. The connecting head 244 can axially cover the through hole 262, i.e., in the case where the end surfaces of the through hole 262 and the connecting head 244 are both circular, the end surface diameter of the connecting head 244 is larger than the end surface diameter of the through hole 262.

In the use process, in order to avoid the great noise generated by the bearing assembly and the like, the great noise is directly transmitted to the outside and the use experience of a user is influenced, and a noise reduction cavity 27 is arranged between the heating plate 242 and the heat shield 26 for noise reduction. Specifically, a first blocking rib 263 is further disposed between the heat generating tray 242 and the heat shield 26, the first blocking rib 263 may be formed in two forms, and the position of the first blocking rib 263 may be formed by upward protrusion of the heat shield 26 or formed by downward protrusion of the heat generating tray 242. Preferably, the first blocking rib 263 and the heat shield 26 are integrally formed, so that the heat of the heating plate 242 can be prevented from being transferred downwards along the first blocking rib 263 to affect the operation of the main unit 1. A first noise reduction cavity 271 surrounding the bearing assembly 243 is formed between the heat generating disc 242 and the heat shield 26 through a first blocking rib 263, and the heat shield 26, the connecting head 244, the heat generating disc 242 and the first blocking rib 263 form a surrounding of the bearing assembly 243.

The food processor of the utility model covers the through hole 262 of the heat shield 26 in the axial direction by using the connecting head 244 of the cutter shaft 241 on the basis of the structure of the existing heat shield 26, and is provided with the first blocking rib 263 between the heating disc 242 and the heat shield 26, the connecting head 244, the heating disc 242 and the first blocking rib 263 form a surrounding to the bearing assembly 243, thereby forming a cavity body for reducing noise, namely a first noise reduction cavity 271. The noise reduction is performed by the first noise reduction cavity 271 surrounding the bearing assembly 243, so that the transmission path of the sound wave is prolonged, the sound wave is reflected and refracted for multiple times among the heat generating disc 242, the heat shield 26 and the first blocking rib 263, and the energy is attenuated, so that the noise reduction is performed. The experience is better for the user of the food processor.

As shown in fig. 3 to 6, as a preferred embodiment of the present invention, a first rib 263 is provided on the heat shield 26, and the first rib 263 is a protrusion of the upper surface of the heat shield 26 toward the heat generating plate 242, thereby forming an annular rib body surrounding the bearing assembly 243. The first rib 263 does not abut against the lower surface of the heat generating plate 242, but has a gap with the heat generating plate 242, and the gap forms the first reducer section 28 of the first noise reduction cavity 271. The reducing structure enables impedance to be changed in the sound transmission process at the abrupt change position of the section of the sound wave transmission path between the first noise reduction cavity 271 and the outside, so that sound wave reflection and interference occur, and reactive attenuation occurs, and therefore the sound energy radiated outwards by the first noise reduction cavity 271 is reduced, and the noise reduction effect is achieved.

As shown in fig. 5-6, as a preferred embodiment of the present invention, the heat shield 26 forms a radial necking structure 264 at the first barrier rib 263. A radial cuff structure 264 is formed below the bearing assembly 243 and the coupling head 244 is located below the radial cuff structure 264. The radial closing-in structure 264 can reduce the size of the through hole 262, further reduce the size of the connecting head 244, and also reduce the weight of the whole machine. In the axial direction, there are overlapping segments between the bearing assembly 243 and the radial closing structure 264, and between the radial closing structure 264 and the connecting head 244. The overlapping section can be added with a reflecting surface, and sound waves are reflected and interfered for multiple times on the surface of the overlapping section, so that the noise reduction effect can be improved.

As shown in fig. 5 to 8, as a preferred embodiment of the present invention, a second noise reduction cavity 272 communicating with the first noise reduction cavity 271 through the first reducer section 28 is further provided between the heat generating plate 242 and the heat shield 26. The cavity between the heat generating plate 242 and the heat shield 26 is divided into a first noise reduction cavity 271 and other cavities by the first blocking rib 263, wherein the second noise reduction cavity 272 is mainly formed by the heat generating plate 242, the part of the heat shield 26 outside the first blocking rib 263 and the inner support 222 of the cup body 21. By arranging the second noise reduction cavity 272, the second noise reduction cavity 272 and the first noise reduction cavity 271 form a multi-stage noise reduction structure, and sound waves are emitted and refracted again in the second noise reduction cavity 272, so that the sound energy is weakened. Further, the first noise reduction cavity 271 and the second noise reduction cavity 272 are designed to be cavities with different volumes, and due to the fact that the frequency bands of the sound waves are different, under the condition that the volumes of the cavities are different, the sound wave energy of different frequency bands can be weakened. When the sound wave is transmitted to the second noise reduction cavity 272 through the first diameter-changing section 28, the cross section of the sound wave propagation path changes abruptly again, so that reactive attenuation occurs, and further noise reduction is achieved.

As shown in fig. 7-8, as a preferred embodiment of the present invention, the second noise reduction cavity 272 surrounds the first noise reduction cavity 271, and one or more second ribs 265 for reflecting the externally transmitted sound waves are provided in the second noise reduction cavity 272. The second blocking rib 265 is a rib protruding along the upper surface of the heat shield 26, and forms a concentric ring structure with the first blocking rib 263. The reflecting surface can be increased by arranging the second blocking rib 265, so that the sound waves are reflected for multiple times in the second noise reduction cavity 272, and the sound energy is attenuated. As shown in fig. 8, the protruding height of the second rib 265 is H1, when the sound wave generated during the operation of the machine propagates outward from the first noise reduction cavity 271, the sound wave is transmitted to the outside along the dotted arrow in fig. 8, and after being reflected by the bottom end surface of the heat generating plate 242, the sound wave moves obliquely downward, and after being reflected by the upper end surface of the heat insulating cover 26, the sound wave moves upward to the height H2 of the second rib 265, where H1 is greater than H2, the sound wave is reflected inward by the radial plane of the second rib 265, and the sound wave can pass through the outer shell 221 of the cup 22 to reach the outside after being reflected for multiple times, thereby increasing the transmission path of the sound wave. It is understood that the number of the second ribs 265 is not limited, and the effect is better while the number is increased. And through the form that sets up second fender muscle 265 in the lower terminal surface of dish 242 and the up end of heat exchanger 226 that generates heat in the mistake, noise reduction effect is better.

As shown in fig. 8, as a preferred embodiment of the present invention, a second reducer section 29 is formed between the cup holder 22 and the second rib 265. When the sound wave is transmitted from the second noise reduction cavity 272 to the outside, the cross section of the sound wave propagation path changes abruptly again through the gap between the cup 22 and the second rib 265, and reactive attenuation occurs.

As shown in FIG. 8, a third noise reduction cavity 273 is formed between the cup holder 22 and the heat shield 26 and communicates with the second noise reduction cavity 272 through the second reducer section 29. The edge of the heat shield 26 protrudes upwards to form a third blocking rib, and the third blocking rib and the mounting boss 261 are arranged at intervals. The third noise reduction cavity 273 is surrounded by the upper end surface of the heat shield 26, the second blocking rib 265, the mounting boss 261, the third blocking rib, and the inner bracket 222. The third noise reduction cavity 273, the second noise reduction cavity 272 and the first noise reduction cavity 271 form a multi-stage noise reduction structure, and sound waves are transmitted and refracted again in the third noise reduction cavity 273, so that the attenuation of sound energy is generated.

As shown in fig. 8, as a preferred embodiment of the present invention, the cup holder 22 is provided with an extending portion 223 overlapping with the second stopper rib 265 in the radial direction, and the second reducing section 29 is formed between the extending portion 223 and the second stopper rib 265. Specifically, after the inner bracket 222 continues to extend downward for a certain length along the mounting boss 261, the extending portion 223 radially protrudes toward the center, and the extending portion 223 protrudes to the second blocking rib 265, and a certain gap exists between the extending portion 223 and the second blocking rib 265. To extend the propagation path of the acoustic wave, the end surface of the extension 223 continues to protrude downward in the axial direction. Further defining the forming position of the second reducing section 29, the extension 223 can increase the reflection surface of the sound wave in the radial direction, and extend the transmission path of the sound wave, and at the same time, the noise reduction effect is achieved.

As a preferred embodiment of the present invention, the first barrier rib 263 and the second barrier rib 265 have a plurality of reflecting surfaces (not shown in the drawings) in the axial direction and the radial direction. The blocking ribs are designed to be structures which are provided with reflecting surfaces in the axial direction and the radial direction, for example, the first blocking rib 263 and the second blocking rib 265 are designed to be structures with multi-stage steps, so that the reflecting surfaces are increased, sound waves can be reflected between the radial reflecting surface and the axial reflecting surface, and the noise reduction effect is further improved.

As shown in fig. 5 and 7, in the preferred embodiment of the present invention, the volume of the first noise reduction chamber 271 is V1, the volume of the second noise reduction chamber 272 is V2, and V2 > V1. Through setting up the expansion cavity of different volumes for the cavity 272 and the first chamber 271 of making an uproar form the multistage structure of making an uproar, thereby can reduce the noise of different frequency channels. The volumes of the first noise reduction cavity 271 and the second noise reduction cavity 272 are gradually increased, so that the sound energy is released step by step, and the situation that the sound energy is gathered to cause noise increase in a certain direction is avoided. Furthermore, the distance between the first rib 263 and the bearing assembly 243 is D, D is small, and preferably 0 < D ≦ 20mm, so that the noise generated by the bearing assembly 243 can be reflected between the first rib 263 and the bearing assembly 243 for multiple times, and then is transmitted to the second noise reduction cavity 272 through the first reducer section 28.

The technical solutions protected by the present invention are not limited to the above embodiments, and it should be noted that the combination of the technical solution of any one embodiment and the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims (10)

1. The utility model provides a food preparation machine of low noise, includes that host computer, detachable install in the processing cup subassembly of host computer, processing cup subassembly includes cup, cup and locates blade disc subassembly between cup and the cup, blade disc subassembly include arbor, centre gripping in heating dish between cup and the cup and being fixed in heating dish is in order to install the bearing assembly of arbor, it is equipped with the heat exchanger to generate heat dish below, the heat exchanger is equipped with the confession the through-hole that the arbor passed, the arbor passes the one end of through-hole is equipped with the connector, a serial communication port, the connector can cover in the axial direction the through-hole, heating dish with form through first fender muscle between the heat exchanger and center on bearing assembly's the first chamber of making an uproar of falling.

2. A low noise food processor as defined in claim 1, wherein said first blocking rib is provided to said heat shield, and a gap between said first blocking rib and said heat generating plate forms a first diameter-changing section.

3. A low noise food processor as defined in claim 1, wherein said heat shield forms a radial setback at said first barrier rib.

4. A low noise food processor as defined in claim 2, wherein a second noise reducing chamber is provided between said heat generating plate and said heat shield, said second noise reducing chamber communicating with said first noise reducing chamber through said first reducer section.

5. A low noise food processor according to claim 4, wherein the second noise reducing chamber surrounds the first noise reducing chamber and wherein one or more second ribs are provided in the second noise reducing chamber to reflect outgoing sound waves.

6. A low noise food processor as defined in claim 5, wherein said cup holder and said second rib define a second reducer section therebetween.

7. A low noise food processor as defined in claim 6, wherein a third noise reducing chamber is provided between said cup holder and said heat shield in communication with said second noise reducing chamber through said second reducer section.

8. A low noise food processor as defined in claim 6, wherein said cup holder is provided with an extension portion overlapping said second stopper rib in a radial direction, said second variable diameter section being formed between said extension portion and said second stopper rib.

9. A low noise food processor as defined in claim 5, wherein said first and second ribs have axially and radially reflecting surfaces.

10. A low noise food processor as defined in claim 4, wherein said first noise reduction chamber has a volume of V1 and said second noise reduction chamber has a volume of V2, V2 > V1.

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