Vaneless diffuser and centrifugal compressor

Abstract

The utility model discloses a vaneless diffuser and a centrifugal compressor. Wherein the vaneless diffuser comprises a shell, the shell forms a circular ring in a surrounding mode, a containing space is formed in the shell, a resonant cavity inlet groove is formed in the shell, and the shell is arranged on the peripheral side of a blade in a sleeving mode; the noise reduction part is arranged in the containing space, the noise reduction part and the shell are integrally formed, a sound channel is formed by the noise reduction part and the shell, the noise reduction part is made of an acoustic metamaterial, and the noise reduction part and the resonant cavity inlet groove are arranged in a matched mode. Through the arrangement of the noise reduction piece, the vaneless diffuser can effectively reduce noise of the centrifugal compressor, meanwhile, the outer space of the vaneless diffuser is not occupied, and the application range of the vaneless diffuser is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a bladeless diffuser and a centrifugal compressor. Background Art

[0002] Centrifugal compressors, also known as "vortex compressors", are a type of compressor. The structure and operating principle are similar to centrifugal blowers, but they are always multi-stage, which can make the gas obtain higher pressure, larger processing capacity, and higher efficiency. Centrifugal compressors are widely used in various process flows to transport air, various process gases or mixed gases and increase their pressure.

[0003] In order to increase the gas pressure of the centrifugal compressor, a bladeless diffuser is usually provided on the centrifugal compressor. The bladeless diffuser is a device for increasing the gas pressure. The compression and pressurization of the gas are achieved through the setting of the bladeless diffuser.

[0004] At present, with the continuous increase in demand, the design requirements for centrifugal compressors are also increasing, especially the requirements for noise. The main sources of noise in centrifugal compressors are the aerodynamic noise caused by the rotation of the impeller and the electromagnetic noise of the motor. In the diffuser, the gas changes the flow direction and the cross-sectional area of ​​the pipeline increases to slow down the airflow. This deceleration effect converts kinetic energy into pressure energy. The existing diffuser only has a pressure-diffusing effect on the gas, but cannot reduce aerodynamic noise; or noise reduction can be achieved by setting a silencer structure outside the diffuser, but the structure added outside must consider the size of the installation position, which has certain restrictions on the noise structure, and the noise reduction effect is not obvious. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0006] In view of this, the utility model provides a bladeless diffuser and a centrifugal compressor, wherein the bladeless diffuser can effectively reduce the noise of the centrifugal compressor.

[0007] Specifically, the following technical solutions are included:

[0008] An embodiment of the first aspect of the present utility model provides a vaneless diffuser, the vaneless diffuser comprising:

[0009] The outer shell is enclosed in a circular ring shape, a receiving space is provided in the outer shell, a resonance cavity inlet groove is provided on the outer shell, and the outer shell is sleeved on the outer peripheral side of the blade;

[0010] A noise reduction component is arranged in the accommodating space, the noise reduction component and the shell are integrally formed, the noise reduction component and the shell form a sound channel, and the noise reduction component is matched with the inlet groove of the resonance cavity.

[0011] Optionally, the outer shell includes an upper plate and a lower plate, the upper plate and the lower plate are arranged opposite to each other, the outer shell also includes an inner plate and an outer plate for connecting the upper plate and the lower plate, the upper plate, the lower plate, the inner plate and the outer plate enclose the accommodating space, the upper plate or the outer plate is provided with the resonance cavity entrance groove, and the noise reduction component is arranged close to the outer plate.

[0012] Optionally, the noise reduction component is disposed on the upper plate and extends toward the lower plate, or the noise reduction component is disposed on the lower plate and extends toward the upper plate.

[0013] Optionally, the noise reduction member comprises: a horizontal plate and a plurality of vertical plates arranged on the horizontal plate, wherein a side of the horizontal plate facing the vertical plate is flush with a side of the upper plate facing the lower plate, and the vertical plates extend toward the lower plate;

[0014] Alternatively, the side of the horizontal plate facing the vertical plate is flush with the side of the lower plate facing the upper plate, and the vertical plate extends toward the upper plate.

[0015] Optionally, the vertical plate is at a first distance from the lower plate on a side facing away from the horizontal plate;

[0016] or the vertical plate is located at a first distance from the upper plate on a side facing away from the horizontal plate;

[0017] Wherein, the first distance is smaller than the distance between the upper plate and the lower plate.

[0018] Optionally, the noise reduction component includes an upper body and a lower body, the upper body is fixedly connected to the upper plate, the lower body is fixedly connected to the lower plate, and at least part of the upper body and the lower body are overlapped.

[0019] Optionally, the upper body comprises a first transverse plate and a plurality of first vertical plates arranged on the first transverse plate, a side of the first transverse plate facing the first vertical plate is flush with a side of the upper plate facing the lower plate, and the first vertical plates extend toward the lower plate; and

[0020] The lower body comprises a second transverse plate and a plurality of second vertical plates arranged on the second transverse plate, the second transverse plate faces one side of the second vertical plate and is flush with the side of the lower plate facing the upper plate, and the second vertical plates extend toward the upper plate;

[0021] Wherein, a plurality of the first vertical plates and a plurality of the second vertical plates are arranged at intervals.

[0022] Optionally, the first vertical plate and the second vertical plate have the same thickness, a side of the first vertical plate facing away from the first horizontal plate is at a first distance from the lower plate, and a side of the second vertical plate facing away from the second horizontal plate is at a first distance from the upper plate, and the first distance is smaller than a distance between the upper plate and the lower plate; and

[0023] There is a second distance between adjacent first vertical plates and the second vertical plates, and the second distance is smaller than a distance between the inner enclosure plate and the outer enclosure plate.

[0024] Optionally, a fixing bolt hole and a sensor mounting hole are provided on the housing, and a plurality of the noise reduction members are circumferentially arranged in the accommodation space; or

[0025] A plurality of accommodating spaces are provided in the radial direction of the housing, and a plurality of the noise reduction members are circumferentially arranged in each of the accommodating spaces; or

[0026] A plurality of accommodating spaces are provided in the axial direction of the housing, and a plurality of the noise reduction members are circumferentially arranged in each of the accommodating spaces.

[0027] An embodiment of the second aspect of the present utility model provides a centrifugal compressor, the centrifugal compressor comprising:

[0028] blades; and

[0029] As for the bladeless diffuser mentioned above, the bladeless diffuser is sleeved on the outer peripheral side of the blades, and the bladeless diffuser is fixedly connected to the compressor casing.

[0030] The bladeless diffuser and centrifugal compressor provided by the embodiment of the utility model, wherein the bladeless diffuser includes a shell, the shell is enclosed in a ring shape, a receiving space is provided in the shell, a noise reduction member is provided in the receiving space, the noise reduction member and the shell are integrally formed, a resonance cavity inlet groove is provided on the shell, the noise reduction member and the shell form a sound channel, the noise enters the sound channel through the resonance cavity inlet groove, and the noise reduction member is provided to increase the path of the noise, thereby reducing the final noise decibel, and the noise reduction effect is obvious; at the same time, the noise reduction member is provided inside the shell, does not occupy the external space of the bladeless diffuser, is more convenient for the installation of the bladeless diffuser, and expands the scope of application of the bladeless diffuser. The noise reduction member is made of acoustic metamaterials, which can better reduce the noise generated when the fluid flows through the bladeless diffuser, and reduce the impact on the working environment caused by excessive noise. In addition, the acoustic metamaterial is lighter in weight, thereby reducing the weight of the bladeless diffuser, and is more convenient for the installation of the bladeless diffuser.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 is an external schematic diagram of a vaneless diffuser according to an embodiment of the utility model;

[0034] Figure 2 for Figure 1 AA schematic diagram of an embodiment shown;

[0035] Figure 3 for Figure 1 AA schematic diagram of another embodiment shown;

[0036] Figure 4 for Figure 1 AA schematic diagram of yet another embodiment shown;

[0037] Figure 5 A schematic diagram of a radial arrangement of a noise reduction member according to an embodiment of the utility model;

[0038] Figure 6 It is a schematic diagram of the axial arrangement of the noise reduction component according to an embodiment of the utility model.

[0039] in, Figures 1 to 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0040] 100 bladeless diffuser, 110 outer shell, 111 upper plate, 112 lower plate, 113 inner panel, 114 outer panel, 120 noise reduction component, 121 transverse plate, 122 vertical plate, 123 upper body, 1231 first transverse plate, 1232 second vertical plate, 124 lower body, 1241 second transverse plate, 1242 second vertical plate, 130 fixing bolt hole, 140 sensor mounting hole, 150 resonance cavity inlet slot, d1 first distance, d2 second distance, d3 third distance. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] Before further describing the embodiments of the present invention in detail, the directional terms involved in the embodiments of the present invention, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the protection scope of the present invention.

[0043] In order to make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0044] Figure 1 It is an external schematic diagram of a vaneless diffuser according to an embodiment of the utility model.

[0045] like Figure 1 As shown, an embodiment of the present utility model provides a vaneless diffuser 100, and the vaneless diffuser 100 includes:

[0046] The outer shell 110 is enclosed in a ring shape, a receiving space is provided in the outer shell 110, a resonance cavity inlet groove 150 is provided on the outer shell 110, and the outer shell 110 is sleeved on the outer peripheral side of the blade;

[0047] The noise reduction member 120 is disposed in the accommodating space. The noise reduction member 120 and the housing 110 are integrally formed. The noise reduction member 120 and the housing 110 form a sound channel. The noise reduction member 120 is made of acoustic metamaterial. The noise reduction member 120 is matched with the resonance cavity entrance slot 150.

[0048] Among them, the bladeless diffuser 100 includes an outer shell 110, which is surrounded by a circular ring shape. A accommodating space is provided in the outer shell 110, and a noise reducer 120 is provided in the accommodating space. The noise reducer 120 and the outer shell 110 are integrally formed. A resonance cavity inlet groove 150 is provided on the outer shell 110. The noise reducer 120 and the outer shell 110 form a sound channel. The noise enters the sound channel through the resonance cavity inlet groove 150. Through the setting of the noise reducer 120, the path of the noise can be increased, thereby reducing the final noise decibel, and the noise reduction effect is obvious; at the same time, the noise reducer 120 is arranged inside the outer shell 110, does not occupy the external space of the bladeless diffuser 100, is more convenient for the installation of the bladeless diffuser 100, and expands the application range of the bladeless diffuser 100. The noise reduction component 120 is made of an acoustic metamaterial, which can better reduce the noise generated when the fluid flows through the bladeless diffuser 100, thereby reducing the impact of excessive noise on the working environment. In addition, the acoustic metamaterial is lightweight, thereby reducing the weight of the bladeless diffuser 100 and making it easier to install the bladeless diffuser 100.

[0049] It should be noted that the noise reduction component 120 and the outer shell 110 are integrally formed, which can make the bladeless diffuser 100 have good structural stability and is more conducive to the operation of the bladeless diffuser 100 in a complex environment. In this embodiment, the outer shell 110 and the noise reduction component 120 are integrally formed by 3D printing, which reduces the production difficulty of the bladeless diffuser 100 and improves the production efficiency of the bladeless diffuser 100.

[0050] It is understandable that when the bladeless diffuser 100 is applied to a centrifugal compressor, part of the wind passes through the air port formed by the inner enclosure 113, and part of the wind enters the bladeless diffuser 100 with the sound through the resonance cavity inlet slot 150, and then consumes the noise entering the bladeless diffuser 100, thus having a noise reduction effect. Each centrifugal compressor is provided with at least two bladeless diffusers 100, or a greater even number of diffusers 100, to further achieve the purpose of noise reduction.

[0051] In a feasible embodiment, the outer shell 110 includes an upper plate 111 and a lower plate 112, and the upper plate 111 and the lower plate 112 are arranged opposite to each other. The outer shell 110 also includes an inner plate 113 and an outer plate 114 for connecting the upper plate 111 and the lower plate 112. The upper plate 111, the lower plate 112, the inner plate 113 and the outer plate 114 enclose a receiving space, and a resonance cavity entrance groove 150 is formed between the upper plate 111 or the outer plate 114, and the noise reduction component 120 is arranged close to the outer plate 114.

[0052] Among them, the upper plate 111, the lower plate 112, the inner plate 113 and the outer plate 114 enclose a storage space, and a resonance cavity entrance groove 150 is formed between the upper plate 111 and the outer plate 114. The resonance cavity entrance groove 150 and the noise reduction member 120 form a sound channel. Part of the wind passes through the circular wind channel synthesized by the inner plate 113, and at the same time, part of the wind and noise enter the sound channel through the resonance cavity entrance groove 150. In a limited space, the sound wave travel is extended, thereby achieving the purpose of noise reduction. In other words, the decibel of the wind sound you hear 5 meters away from the wind point must be greater than the decibel of the wind sound you hear 10 meters away from the wind point.

[0053] It is understandable that the present application arranges the noise reduction elements 120 in a periodic manner to extend the distance of sound passing in a limited space, thereby achieving a noise reduction effect. At the same time, the noise reduction elements 120 are made of acoustic metamaterials, which are sound-absorbing materials, further achieving a sound absorption and noise reduction effect.

[0054] Figure 2 for Figure 1 AA schematic diagram of an embodiment shown; Figure 3 for Figure 1 AA schematic diagram of another embodiment shown;

[0055] In a possible implementation, Figure 2 and Figure 3 As shown, the noise reduction member 120 is disposed on the upper plate 111 and extends toward the lower plate 112 , or the noise reduction member 120 is disposed on the lower plate 112 and extends toward the upper plate 111 .

[0056] Among them, by setting the noise reduction member 120 on the upper plate 111, or setting the noise reduction member 120 on the lower plate 112, and through the noise reduction member 120, the effect of extending the sound passing distance in a limited space can be achieved. In other words, there is no additional restriction on where the noise reduction member 120 is set, as long as it is ensured that the distance of the sound passing is extended and a passage can be formed. At this time, the resonance cavity entrance groove 150 is located on the upper plate 111 and is located at the end away from the inner enclosure plate 113, or the resonance cavity entrance groove 150 is located on the outer plate 114 and is located at the end close to the upper plate 111, which can be farthest from the inner enclosure plate 113, thereby maximizing the space, and the most noise enters the limited space, achieving the purpose of noise reduction.

[0057] In a feasible implementation, the noise reduction member 120 includes: a horizontal plate 121 and a plurality of vertical plates 122 disposed on the horizontal plate 121, wherein a side of the horizontal plate 121 facing the vertical plates 122 is flush with a side of the upper plate 111 facing the lower plate 112, and the vertical plates 122 extend toward the lower plate 112;

[0058] Alternatively, a side of the horizontal plate 121 facing the vertical plate 122 is flush with a side of the lower plate 112 facing the upper plate 111 , and the vertical plate 122 extends toward the upper plate 111 .

[0059] Among them, when the noise reduction component 120 is set on the upper plate 111, the side of the horizontal plate 121 facing the vertical plate 122 is flush with the side of the upper plate 111 facing the lower plate 112, the vertical plate 122 is fixedly connected to the horizontal plate 121, and the vertical plate 122 extends toward the lower plate 112, and sound channels are formed between the vertical plates 122 and 122, and between the vertical plates 122 and the lower plate 112, which facilitates the passage of sound and at the same time extends the sound passage path in a limited space, thereby effectively reducing noise.

[0060] Similarly, when the noise reduction component 120 is arranged on the lower plate 112, the side of the horizontal plate 121 facing the vertical plate 122 is flush with the side of the lower plate 112 facing the upper plate 111, the vertical plate 122 is fixedly connected to the horizontal plate 121, and the vertical plate 122 extends toward the upper plate 111, and sound channels are formed between the vertical plates 122 and 122, and between the vertical plates 122 and the upper plate 111, which facilitates the passage of sound and at the same time extends the sound passage path within a limited space, thereby effectively reducing noise.

[0061] It should be noted that, in this embodiment, the horizontal plate 121 and the vertical plate 122 are substantially vertically arranged. In this application, substantially vertically means that the angle between the horizontal plate 121 and the vertical plate 122 is 90°±3°.

[0062] In a feasible implementation, the side of the vertical plate 122 facing away from the horizontal plate 121 is at a first distance d1 from the lower plate 112;

[0063] Or the side of the vertical plate 122 facing away from the horizontal plate 121 is at a first distance d1 from the upper plate 111;

[0064] The first distance d1 is smaller than the distance between the upper plate 112 and the lower plate 113 .

[0065] It should be noted that when the noise reduction component 120 is arranged on the upper plate 111, the vertical plate 122 is away from the side of the horizontal plate 121 and is away from the lower plate 112 by a first distance d1; when the noise reduction component 120 is arranged on the lower plate 112, the vertical plate 122 is away from the side of the horizontal plate 121 and is away from the upper plate 111 by a first distance d1, and this first distance d1 is smaller than the distance between the upper plate 112 and the lower plate 113, that is to say, a channel for noise to pass through must be left to ensure that the noise and part of the wind energy can fill the entire accommodation space.

[0066] In this embodiment, three vertical plates 122 are provided, but the present invention is not limited to three vertical plates 122. The number of vertical plates 122 can be increased or decreased according to the frequency targeted by the noise reduction. The vertical plates 122 can be in pairs or in odd numbers. In other words, the number of vertical plates 122 is not limited and can be selected according to actual needs.

[0067] It can be understood that, usually, the noise reduction component 120 is arranged in the accommodating space in a fan shape, and multiple fan-shaped noise reduction components 120 are circumferentially arranged in the accommodating space. The side of the noise reduction component 120 facing away from the outer plate 114 is separated from the side of the inner plate 113 facing the outer plate 114 by a third distance d3. The third distance d3 is limited according to the circumferential length of a single noise reduction component 120. Usually, the third distance d3 is smaller than the circumferential length of a single noise reduction component 120. The specific value of the third distance d3 is designed according to the frequency targeted by the noise reduction, and no other restrictions are made herein.

[0068] It should be noted that the number, position and length of the resonance cavity entrance slots 150 are matched with the noise reduction component 120, that is, the resonance cavity entrance slots 150 and the noise reduction component 120 are matched, and the number and position of the two are the same. When a noise reduction component 120 is set, a resonance cavity entrance slot 150 must be set accordingly, and the length of the resonance cavity entrance slot 150 is the same as the axial length of the noise reduction component 120.

[0069] In a feasible embodiment, the noise reduction component 120 includes an upper body 123 and a lower body 124, the upper body 123 is fixedly connected to the upper plate 111, the lower body 124 is fixedly connected to the lower plate 112, and at least part of the upper body 123 and the lower body 124 are overlapped.

[0070] Among them, the noise reduction component 120 in this embodiment includes an upper body 123 and a lower body 124. The upper body 123 is fixedly connected to the upper plate 111, and the lower body 124 is fixedly connected to the lower plate 112. Such an arrangement can further extend the sound passage within a limited space and achieve the purpose of noise reduction.

[0071] Figure 4 for Figure 1 FIG. 2 is an AA schematic diagram of yet another embodiment.

[0072] In a possible implementation, Figure 4 As shown, the upper body 123 includes a first transverse plate 1231 and a plurality of first vertical plates 1232 disposed on the first transverse plate 1231. The first transverse plate 1231 faces one side of the first vertical plates 1232 and is flush with the side of the upper plate 111 facing the lower plate 112. The first vertical plates 1232 extend toward the lower plate 112.

[0073] The lower body 124 includes a second transverse plate 1241 and a plurality of second vertical plates 1242 disposed on the second transverse plate 1241. A side of the second transverse plate 1241 facing the second vertical plates 1242 is flush with a side of the lower plate 112 facing the upper plate 111. The second vertical plates 1242 extend toward the upper plate 111.

[0074] The plurality of first vertical plates 1232 and the plurality of second vertical plates 1242 are arranged at intervals.

[0075] It should be noted that multiple first vertical plates 1232 and multiple second vertical plates 1242 are arranged at intervals, and usually a first vertical plate 1232 is located in the middle of two adjacent second vertical plates 1242, and a second vertical plate 1242 is located in the middle of two adjacent first vertical plates 1232. This forms a more complex maze structure, which further extends the sound transmission path within a limited space and achieves the purpose of noise reduction.

[0076] It is understandable that, whether the noise reduction component 120 is only provided on the upper plate 111, or the noise reduction component 120 is only provided on the lower plate 112, or the noise reduction component 120 is respectively connected to the upper plate 111 and the lower plate 112, a labyrinth-type acoustic metamaterial structure can be formed in the accommodation space of the housing 110, and such a labyrinth-type acoustic metamaterial structure can play a role in sound absorption and sound insulation within the frequency bandwidth near the target frequency. In other words, when the sounds of these frequency bands are transmitted into the accommodation space, resonance is generated inside these accommodation spaces, which has a sound absorption effect. When the sound passes vertically through the structure of the noise reduction component 120, it passes through media of different densities, such as steel and gas. Every time the sound propagates through the interface between the two media, it consumes energy, which is the sound insulation effect.

[0077] In a feasible embodiment, the first vertical plate 1232 and the second vertical plate 1242 have the same thickness, the first vertical plate 1232 and the side away from the first horizontal plate 1231 are at a first distance d1 from the lower plate 112, and the second vertical plate 1242 and the side away from the second horizontal plate 1241 are at a first distance d1 from the upper plate 111, and the first distance d1 is smaller than the distance between the upper plate 111 and the lower plate 112; and

[0078] The adjacent first vertical plates 1232 and second vertical plates 1242 are spaced apart by a second distance d2 , and the second distance d2 is smaller than the distance between the inner enclosure plate 113 and the outer enclosure plate 114 .

[0079] Among them, in this embodiment, three first vertical plates 1232 and three second vertical plates 1242 are set, but the number of the first vertical plates 1232 and the second vertical plates 1242 is not limited to three, and the number of the first vertical plates 1232 and the second vertical plates 1242 can be increased or decreased according to the frequency targeted by the noise reduction, and the first vertical plates 1232 and the second vertical plates 1242 can be in pairs or not, and can be set at intervals. In other words, the number of the first vertical plates 1232 and the second vertical plates 1242 is not limited, and can be selected according to actual needs.

[0080] It can be understood that, among the adjacent first vertical plates 1232 and second vertical plates 1242, the side of the first vertical plate 1232 facing the second vertical plate 1242 is separated from the side of the second vertical plate 1242 facing the first vertical plate 1232 by a second distance d2, and the second distance d2 is smaller than the distance between the inner panel 113 and the outer panel 114, and the first distance d1 is smaller than the distance between the upper panel 111 and the lower panel 112, so as to ensure that the noise reduction component 120 is completely disposed in the accommodating space, and the number of the first vertical plates 1232 and the second vertical plates 1242 is selected according to the noise frequency band.

[0081] Figure 5 A schematic diagram of a radial arrangement of a noise reduction member according to an embodiment of the utility model; Figure 6 It is a schematic diagram of the axial arrangement of the noise reduction component according to an embodiment of the utility model.

[0082] In a possible implementation, Figure 5 and Figure 6 As shown, the housing 110 is provided with a fixing bolt hole 130 and a sensor mounting hole 140, and a plurality of noise reduction members 120 are arranged circumferentially in the accommodation space; or

[0083] A plurality of accommodating spaces are provided in the radial direction of the housing 110, and a plurality of noise reducing members 120 are circumferentially arranged in each accommodating space; or

[0084] A plurality of accommodation spaces are provided in the axial direction of the housing 110 , and a plurality of noise reduction members 120 are circumferentially arranged in each accommodation space.

[0085] It should be noted that the multiple noise reducing members 120 are arranged in a fan shape and can be arranged at intervals in the circumferential direction of the accommodation space, with the distance between two adjacent noise reducing members 120 being 1mm to 2mm, or the interval being equal to the average wall thickness of the noise reducing members 120 (average thickness of the vertical plate); multiple noise reducing members 120 can also be connected end to end when arranged circumferentially to form an annular noise reducing member. If the gas flows in the circumferential direction, the more noise reducing members 120 are arranged, the better the noise reduction effect. It can be understood that the fixing bolt hole 130 on the outer shell 110 is used to connect the bladeless diffuser 100 to the compressor casing, and the sensor mounting hole 140 is set as a through hole or a blind hole according to the needs, and the type of sensor placed can be a pressure sensor, a temperature sensor, a humidity sensor and / or a speed sensor, or other sensors required for the centrifugal compressor. Usually, the noise reduction component 120 should be arranged away from the fixing bolt holes 130 and the sensor mounting holes 140 to achieve the maximum noise reduction effect. When the noise reduction component 120 is arranged circumferentially with the end to end connected, the fixing bolt holes 130 and the sensor mounting holes 140 can be arranged at the position where the third distance d3 is located to avoid the fixing bolt holes 130 and the sensor mounting holes 140 from penetrating into the noise reduction component 120.

[0086] In which, a plurality of accommodating spaces may be arranged in the radial direction of the housing 110, and a plurality of noise reducing members 120 may be arranged in the circumferential direction of each accommodating space. In this case, two groups of resonance cavity entrance grooves 150 may be arranged on the upper plate 111, or as shown in FIG. Figure 5 As shown, a resonance cavity inlet groove 150 is provided on the upper plate 111, and a resonance cavity inlet groove 150 is provided on the inner peripheral plate 113. The two groups of resonance cavity inlet grooves 150 are respectively connected with multiple accommodating spaces in the radial direction; or multiple accommodating spaces can be provided in the axial direction of the outer shell 110, and multiple noise reduction members 120 are provided in the circumferential direction of each accommodating space. In this case, two groups of resonance cavity inlet grooves 150 are provided on the outer peripheral plate 114, or as shown in FIG. Figure 6 As shown, a resonance cavity entrance slot 150 is provided on the upper plate 111, and a resonance cavity entrance slot 150 is provided on the outer plate 114. The two groups of resonance cavity entrance slots 150 are respectively connected with multiple accommodating spaces in the axial direction. These need to be designed according to the sound of the frequency band, and no excessive restrictions are made here. It can be understood that the number of vertical plates in the noise reduction member 120 is also designed according to the sound of the frequency band. The more noise reduction members 120 are provided and the more vertical plates are provided, the better the noise reduction effect is. However, too many noise reduction members 120 and vertical plates will also increase the production cost of the bladeless diffuser 100, so they can be set according to actual needs. It should be noted that when the noise reduction member 120 is arranged radially or axially, the direction of the resonance cavity entrance will be different, and multiple accommodating spaces also need to form a connecting channel.

[0087] It is understandable that the noise reduction component 120 can also be set to other maze forms, as long as a connected sound channel can be formed in the accommodating space, such as a maze-type noise reduction component formed by overlapping L-shape and inverted L-shape, or a maze-type noise reduction component formed by U-shape and inverted U-shape, or a maze-type noise reduction component 120 formed by an irregular shape, all of which fall within the scope of protection of the present application and are not listed one by one, as long as they can pass through the entrance hole of the resonance cavity.

[0088] Another embodiment of the present invention provides a centrifugal compressor, the centrifugal compressor comprising:

[0089] blades; and

[0090] As for the above-mentioned vaneless diffuser 100, the vaneless diffuser 100 is sleeved on the outer peripheral side of the blades, and the vaneless diffuser 100 is fixedly connected to the compressor casing.

[0091] Among them, the resonance cavity inlet hole on the bladeless diffuser 100 faces the side away from the compressor casing. Through the arrangement of the noise reduction component 120 in the bladeless diffuser 100, the noise can be effectively reduced. At the same time, the external space of the bladeless diffuser 100 is not occupied, so that the bladeless diffuser 100 has a wider range of applications.

[0092] It is understandable that, since the centrifugal compressor includes the vaneless diffuser 100 , the centrifugal compressor also has other advantages of the vaneless diffuser 100 , which will not be described in detail.

[0093] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0094] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention that follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vaneless diffuser, characterized in that: The vaneless diffuser comprises: The outer shell is enclosed in a circular ring shape, a receiving space is provided in the outer shell, a resonance cavity inlet groove is provided on the outer shell, and the outer shell is sleeved on the outer peripheral side of the blade; A noise reduction component is arranged in the accommodating space, the noise reduction component is integrally formed with the shell, the noise reduction component and the shell form a sound channel, the noise reduction component is made of acoustic metamaterial, and the noise reduction component is matched with the entrance groove of the resonance cavity.

2. The vaneless diffuser according to claim 1, characterized in that: The outer shell includes an upper plate and a lower plate, and the upper plate and the lower plate are arranged opposite to each other. The outer shell also includes an inner plate and an outer plate for connecting the upper plate and the lower plate. The upper plate, the lower plate, the inner plate and the outer plate enclose the accommodating space. The upper plate or the outer plate is provided with the resonance cavity entrance groove, and the noise reduction component is arranged close to the outer plate.

3. The vaneless diffuser according to claim 2, characterized in that: The noise reduction component is disposed on the upper plate and extends toward the lower plate, or the noise reduction component is disposed on the lower plate and extends toward the upper plate.

4. The vaneless diffuser according to claim 3, characterized in that: The noise reduction member comprises: a horizontal plate and a plurality of vertical plates arranged on the horizontal plate, wherein one side of the horizontal plate facing the vertical plate is flush with the side of the upper plate facing the lower plate, and the vertical plates extend toward the lower plate; Alternatively, the side of the horizontal plate facing the vertical plate is flush with the side of the lower plate facing the upper plate, and the vertical plate extends toward the upper plate.

5. The vaneless diffuser according to claim 4, characterized in that: The side of the vertical plate facing away from the horizontal plate is at a first distance from the lower plate; or the vertical plate is located at a first distance from the upper plate on a side facing away from the horizontal plate; Wherein, the first distance is smaller than the distance between the upper plate and the lower plate.

6. The vaneless diffuser according to claim 2, characterized in that: The noise reduction component includes an upper body and a lower body, the upper body is fixedly connected to the upper plate, the lower body is fixedly connected to the lower plate, and at least a portion of the upper body and the lower body are overlapped.

7. The vaneless diffuser according to claim 6, characterized in that: The upper body comprises a first transverse plate and a plurality of first vertical plates arranged on the first transverse plate, wherein a side of the first transverse plate facing the first vertical plate is flush with a side of the upper plate facing the lower plate, and the first vertical plates extend toward the lower plate; as well as The lower body comprises a second transverse plate and a plurality of second vertical plates arranged on the second transverse plate, the second transverse plate faces one side of the second vertical plate and is flush with the side of the lower plate facing the upper plate, and the second vertical plates extend toward the upper plate; Wherein, a plurality of the first vertical plates and a plurality of the second vertical plates are arranged at intervals.

8. The vaneless diffuser according to claim 7, characterized in that: The first vertical plate and the second vertical plate have the same thickness, a side of the first vertical plate facing away from the first horizontal plate is at a first distance from the lower plate, and a side of the second vertical plate facing away from the second horizontal plate is at a first distance from the upper plate, and the first distance is smaller than a distance between the upper plate and the lower plate; as well as There is a second distance between adjacent first vertical plates and the second vertical plates, and the second distance is smaller than a distance between the inner enclosure plate and the outer enclosure plate.

9. The vaneless diffuser according to any one of claims 1 to 8, characterized in that: The housing is provided with fixing bolt holes and sensor mounting holes, and a plurality of noise reduction components are circumferentially arranged in the accommodation space; or A plurality of accommodating spaces are provided in the radial direction of the housing, and a plurality of the noise reduction members are circumferentially arranged in each of the accommodating spaces; or A plurality of accommodating spaces are provided in the axial direction of the housing, and a plurality of the noise reduction members are circumferentially arranged in each of the accommodating spaces.

10. A centrifugal compressor, characterized in that: The centrifugal compressor comprises: blades; and The bladeless diffuser according to any one of claims 1 to 9, wherein the bladeless diffuser is sleeved on the outer peripheral side of the blade, and the bladeless diffuser is fixedly connected to the compressor casing.

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