Silencer and compressor

Abstract

The present application provides a silencer and a compressor, the silencer comprising: an inner silencer having a first top cover portion, the inner cavity of the inner silencer forming an exhaust cavity; an outer silencer having a second top cover portion, the outer silencer covering the inner silencer; the outer peripheral edge of the outer silencer and the outer peripheral edge of the inner silencer are sealed and connected, the inner wall of the outer silencer and the outer wall of the inner silencer are surrounded by at least one back cavity, the inner wall of the second top cover portion is in contact with the outer wall of the first top cover portion, part of the inner wall of the second top cover portion has a first groove formed by an upward depression, and / or part of the outer wall of the first top cover portion has a second groove formed by a downward depression; a hole pipe is formed between part of the inner wall of the second top cover portion and the second groove, between part of the outer wall of the first top cover portion and the first groove, and / or between the first groove and the second groove; the hole pipe and the back cavity together form a Helmholtz resonance cavity; the present application achieves effective noise reduction of the compressor in a specific frequency band within 10 Hz to 500 Hz.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a muffler device and a compressor. Background Art

[0002] The low-frequency noise problem of 10Hz to 500Hz is currently the focus of rotary compressors. Developers are all looking for reasonable improvement directions and methods, but the existing built-in expansion chamber muffler cannot effectively reduce the low-frequency noise of 10Hz to 500Hz.

[0003] Therefore, the present invention provides a silencer and a compressor. Summary of the invention

[0004] In view of this, the present invention provides a silencer and a compressor, which can achieve effective noise reduction of the compressor in a specific frequency band within 10 Hz to 500 Hz.

[0005] According to one aspect of the present invention, there is provided a silencing device, comprising:

[0006] An inner muffler having a first top cover portion, a first mounting hole being provided at the center of the inner muffler, and an inner cavity of the inner muffler forming an exhaust cavity;

[0007] an outer muffler having a second top cover portion and a second mounting hole arranged concentrically with the first mounting hole, the outer muffler covering the inner muffler;

[0008] The outer peripheral edge of the outer muffler and the outer peripheral edge of the inner muffler are sealed and connected, the inner wall of the outer muffler and the outer wall of the inner muffler are enclosed to form at least one back cavity, the inner wall of the second top cover part is in contact with the outer wall of the first top cover part, part of the inner wall of the second top cover part has a first groove formed by being recessed upward, and / or part of the outer wall of the first top cover part has a second groove formed by being recessed downward; part of the inner wall of the second top cover part and the second groove, part of the outer wall of the first top cover part and the first groove, and / or the first groove and the second groove are aligned and combined to form a hole pipe; the back cavity is connected to the exhaust cavity through the hole pipe and the first mounting hole to form an airflow channel, and the hole pipe and the back cavity together form a Helmholtz resonance cavity.

[0009] Optionally, the inner radius of the first mounting hole is r1, the inner radius of the inner muffler is r2, the inner radius of the outer muffler is r3, and the overlap ratio between the inner muffler and the outer muffler is t, wherein And t satisfies 0.2≤t≤0.8.

[0010] Optionally, the inner radius of the first mounting hole is r1, the inner radius of the inner silencer is r2, and the length of each hole pipe is L, wherein L satisfies r2-r1<L.

[0011] Optionally, the inner radius of the first mounting hole is r1, the maximum height inside the hole pipe is H, and the total area of ​​the hole pipe projected on the plane where the cross section of the first mounting hole is located is S, wherein 0.3mm<H<10mm, and S<2πr1H.

[0012] Optionally, the extension path of the hole pipe along the extension direction is a curve, a straight line or a broken line.

[0013] Optionally, the number of the hole pipes is at least two.

[0014] Optionally, the inner muffler has a first side wall portion arranged around the first top cover portion, and the outer muffler has a second side wall portion arranged around the second top cover portion. The outer periphery of the inner muffler is provided with a first outer edge portion, and the outer periphery of the outer muffler is provided with a second outer edge portion. The upper surface of the first outer edge portion, the outer surface of the first side wall portion, the lower surface of the second top cover portion, and the inner surface of the second side wall portion jointly define the annular cavity of the back cavity.

[0015] Optionally, the inner radius of the first mounting hole is equal to the inner radius of the second mounting hole.

[0016] Optionally, both the outer muffler and the inner muffler are of a multi-petal cavity structure or an annular cavity structure; or one of them is of a multi-petal cavity structure and the other is of an annular cavity structure.

[0017] Optionally, an upper flange is formed upwardly on the hole wall of the second mounting hole, and the first top cover portion and the second top cover portion are both flat plate structures.

[0018] According to another aspect of the present invention, a compressor is provided, comprising: a housing and a motor and a pump assembly located in the housing, the pump assembly comprising a crankshaft, a cylinder, an upper cylinder head, a lower cylinder head and at least one exhaust structure, the exhaust structure being arranged on the upper cylinder head and / or the lower cylinder head and communicating with a compression chamber inside the cylinder;

[0019] The pump body assembly also includes any of the above-mentioned silencers, the silencer cover is on the side of the upper cylinder head and / or the lower cylinder head away from the cylinder, the inner silencer of the silencer is surrounded by the upper cylinder head and / or the lower cylinder head to form an exhaust chamber, the exhaust chamber is connected with the compression chamber through the exhaust structure, the first mounting hole of the inner silencer and the second mounting hole of the outer silencer are both mounted on the neck of the upper cylinder head and / or the lower cylinder head, and a gap is left between the neck of the upper cylinder head and / or the lower cylinder head, and the exhaust chamber is connected with the hole pipe.

[0020] The beneficial effects of the present invention compared with the prior art are:

[0021] The silencer and compressor provided by the present invention form a first groove on the inner wall of the second top cover portion of the outer silencer, and / or form a second groove on the outer wall of the first top cover portion of the inner silencer, and perform counter-positioned combination to form a hole pipe. Based on the theory of the Helmholtz resonance cavity, low-frequency silencer can be achieved by utilizing the hole pipe and back cavity structure, thereby achieving effective noise reduction of the compressor in a specific frequency band within 10Hz to 500Hz. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0023] Figure 1 A three-dimensional diagram of a muffler device disclosed in one embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of a muffler device disclosed in one embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of an outer silencer in a silencer device disclosed in one embodiment of the present invention;

[0026] Figure 4 A cross-sectional view of an inner silencer in a silencer device disclosed in one embodiment of the present invention;

[0027] Figure 5 A top cross-sectional view of a muffler device disclosed in one embodiment of the present invention;

[0028] Figure 6 A top cross-sectional view of a muffler device disclosed in another embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of a compressor disclosed in one embodiment of the present invention;

[0030] Figure 8 A three-dimensional diagram of a combination of a silencer device and an upper cylinder cover in a compressor disclosed in one embodiment of the present invention;

[0031] Fig. 9 This is the transmission loss curve of the noise in the compressor of the present invention. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and the concept of example embodiments will be fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, materials, devices, etc. may be adopted. In other cases, known technical solutions are not shown or described in detail to avoid blurring various aspects of the present disclosure. The same reference numerals in the figures represent the same or similar structures, and thus their detailed descriptions will be omitted.

[0033] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including", "having" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0034] like Figures 1 to 5 As shown, an embodiment of the present invention discloses a muffler 1, which includes an inner muffler 10 and an outer muffler 20. The inner muffler 10 has a first top cover 11 and a first side wall 13 arranged around the first top cover 11, a first mounting hole is arranged at the center of the inner muffler 10, and the internal cavity of the inner muffler 10 forms an exhaust cavity 12.

[0035] The outer muffler 20 has a second top cover portion 21 and a second mounting hole arranged concentrically with the first mounting hole, and the outer muffler 20 covers the inner muffler 10. The first mounting hole and the second mounting hole are both used to fix the muffler 1 and the upper cylinder head during the compressor assembly process. In this embodiment, the inner radius of the first mounting hole is equal to the inner radius of the second mounting hole. The first top cover portion 11 and the second top cover portion 21 are both flat plate structures. This application is not limited to this.

[0036] The outer periphery of the outer muffler 20 and the outer periphery of the inner muffler 10 are sealed and connected, and the inner wall of the outer muffler 20 and the outer wall of the inner muffler 10 are enclosed to form at least one back cavity 30. The inner wall of the second top cover part 21 is in contact with the outer wall of the first top cover part 11. Part of the inner wall of the second top cover part 21 of the outer muffler 20 has a first groove formed by being recessed upward, and / or part of the outer wall of the first top cover part 11 of the inner muffler 10 has a second groove formed by being recessed downward. The hole pipe 40 is formed by the alignment between the part of the inner wall of the second top cover part 21 and the second groove, between the part of the outer wall of the first top cover part 11 and the first groove, and / or between the first groove and the second groove.

[0037] The back cavity 30 is connected to the exhaust cavity 12 through the hole pipe 40 and the first mounting hole to form an airflow channel. That is, one end of the hole pipe 40 is connected to the back cavity 30, and the other end is respectively connected to the internal areas of the first mounting hole and the second mounting hole. The hole pipe 40 and the back cavity 30 together form a Helmholtz resonance cavity. That is, based on the Helmholtz muffler principle, the hole pipe 40 and the back cavity 30 are used to form a new muffler structure to achieve effective noise reduction of the compressor in a specific frequency band within 10Hz to 500Hz. That is, the present application can adjust the parameters such as the length, maximum inner diameter and number of the hole pipe 40 according to the needs of the target muffler frequency band in low-frequency noise reduction, so as to achieve noise reduction of a specific frequency band of the compressor when it is in working state.

[0038] refer to Figure 2 In this embodiment, the inner radius of the first mounting hole is r1, the inner radius of the inner muffler 10 is r2, the inner radius of the outer muffler 20 is r3, and the overlap ratio of the inner muffler 10 to the outer muffler 20 is t, wherein And t satisfies 0.2≤t≤0.8. Among them, on the one hand, satisfying t≥0.2 can make the effective length of the hole pipe meet the noise reduction requirements of the low-frequency band, thereby achieving effective noise reduction in the low-frequency band within 10Hz to 500Hz. On the other hand, satisfying t≤0.8 can ensure that sufficient space is reserved in the back cavity, increase the sound reduction amount, and thus help improve the sound reduction performance of the silencer.

[0039] In this embodiment, the length of each hole pipe 40 is L, where L satisfies r2-r1<L. Only when the length of the hole pipe 40 L>r2-r1, the inner area of ​​the first installation hole and the back cavity 30 can be connected.

[0040] In this embodiment, the maximum height inside the hole pipe 40 is H, and the total area of ​​the hole pipe 40 projected on the plane where the cross section of the first mounting hole is located is S, wherein 0.3mm<H<10mm; in this way, on the one hand, H>0.3mm is satisfied, which can ensure the feasibility of the process of forming the hole pipe. On the other hand, H<10mm is satisfied, which can ensure that the peak with better sound-absorbing effect is maintained in the low-frequency band, that is, to achieve effective noise reduction in the low-frequency band. And, S satisfies: S<2πr1H. In this way, the effectiveness of the hole feature can be guaranteed, so that the sound-absorbing frequency band is maintained in the low-frequency band area.

[0041] In this embodiment, the outlet of the silencer 1 adopts a middle annular exhaust form, but it is not limited thereto, and the silencer 1 is also applicable to a multi-exhaust outlet form. In this application, the silencer 1 is made of steel or synthetic resin, but it is not limited thereto.

[0042] It should be noted that Figure 2 Since it is necessary to show the hole pipe 40 and the height of the hole pipe 40, Figure 2 The inner wall of the second top cover portion 21 and the outer wall of the first top cover portion 11 are not in a fitted state, and does not represent the state of the inner wall of the second top cover portion 21 and the outer wall of the first top cover portion 11 after actual installation in this application.

[0043] The outer muffler 20 has a second side wall portion 22 arranged around the second top cover portion 21, the outer periphery of the inner muffler 10 is provided with a first outer edge portion 14, the outer periphery of the outer muffler 20 is provided with a second outer edge portion 23, and the upper surface of the first outer edge portion 14, the outer surface of the first side wall portion 13, the lower surface of the second top cover portion 21 and the inner surface of the second side wall portion 22 jointly define the annular cavity of the back cavity 30. The present application is not limited thereto.

[0044] In this embodiment, the longitudinal cross-section of the hole pipe 40 may be circular or square, but is not limited thereto, and may also be other polygons such as a triangle or a semicircle.

[0045] In another embodiment of the present application, based on the above embodiment, the outer muffler 20 and the inner muffler 10 both have a multi-petal cavity structure or an annular cavity structure; or one of them has a multi-petal cavity structure and the other has an annular cavity structure.

[0046] The hole wall of the second mounting hole is formed with an upper flange 24 upwardly. In a preferred embodiment, the upper flange 24 surrounds and forms a first pipe portion, and the cross section of the hole pipe 40 is perpendicular to the axial direction of the first pipe portion, but not limited thereto.

[0047] like Figure 6As shown, the extension path of the hole pipe 40 along the extension direction is a curve. This is helpful to improve the noise reduction effect of the compressor in the low frequency band to a certain extent, that is, the noise reduction effect. Of course, in other embodiments, the extension path can also be a straight line or a broken line.

[0048] In another embodiment of the present application, based on the above embodiment, the hole pipes 40 have at least two holes, which is conducive to improving the noise reduction effect of the compressor in the low frequency band, that is, the noise reduction effect. Further, the plurality of hole pipes 40 are spiral.

[0049] like Figure 7 As shown, an embodiment of the present invention further provides a compressor, including: an upper cover 91, a shell 92, a motor 93, an upper cylinder cover 6, the silencer 1 disclosed in any of the above embodiments, a cylinder 95, a lower cylinder cover 96, a lower cover 97 and a liquid reservoir 98. Among them, the motor 93 and the cylinder 95 are accommodated in the shell 92, and the motor 93 includes an inner rotor 932 and an outer stator 933; the crankshaft 931 transmits the rotational force of the motor 93 to the piston in the cylinder 95 to compress the refrigerant; the upper cylinder cover 6 and the lower cylinder cover 96 and the cylinder 95 jointly define the compression space and support the crankshaft 931; the upper cylinder cover 6 is located between the motor 93 and the cylinder 95, and the upper cover 91 and the lower cover 97 cover the two ends of the shell 92 respectively, and the liquid reservoir 98 is connected to the cylinder 95 to provide refrigerant to the cylinder 95. The upper cylinder cover 6 has a through hole for the crankshaft 931 to pass through. And, as Figure 8 As shown, the muffler 1 for noise reduction and silencing is arranged in the housing 92 and covers the upper cylinder head and / or the lower cylinder head on the side away from the cylinder. The upper cylinder head 6 includes a flange portion and a bearing portion protruding from the flange portion.

[0050] The inner muffler 10 of the muffler device and the upper cylinder head 6 and / or the lower cylinder head 96 form the exhaust chamber 12, which is connected to the compression chamber through the exhaust structure. The high-temperature and high-pressure gas compressed in the compression chamber is discharged through the exhaust chamber 12.

[0051] The first mounting hole of the inner muffler 10 and the second mounting hole of the outer muffler 20 are both sleeved on the neck of the upper cylinder head 6 and / or the lower cylinder head 96, i.e., the bearing portion, and a gap is left between the neck of the upper cylinder head 6 and / or the lower cylinder head 96, i.e., the bearing portion, to form an annular outlet. The exhaust chamber 12 is connected to the hole pipe 40.

[0052] Fig. 9 This is the transmission loss curve of the noise in the compressor of the present invention. Fig. 9 , Fig. 9The horizontal axis X is the sound frequency (Hz), and the vertical axis Y is the transmission loss (dB). The dotted line M is the transmission loss reduction trajectory for different sound frequencies in the prior art, and the solid line N is the transmission loss reduction trajectory for different sound frequencies after using the present application. It can be seen that the present application can effectively reduce noise in a specific frequency band within 10Hz to 500Hz.

[0053] In summary, the silencer and compressor of the present invention have at least the following advantages:

[0054] The silencer device and compressor disclosed in this embodiment form a first groove on the inner wall of the second top cover portion of the outer silencer, and / or a second groove on the outer wall of the first top cover portion of the inner silencer, and perform counter-positioned combination to form a hole pipe. Based on the theory of the Helmholtz resonance cavity, the hole pipe and the back cavity structure can achieve low-frequency silencer, thereby achieving effective noise reduction of the compressor in a specific frequency band within 10Hz to 500Hz.

[0055] In the description of the present invention, it should be understood that the terms "bottom", "longitudinal", "lateral", "upper", "lower", "front", "rear", "vertical", "horizontal", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, and "several" means one or more.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A silencing device, characterized in that: include: An inner muffler (10) having a first top cover portion (11), a first mounting hole being provided at the center of the inner muffler (10), and an internal cavity of the inner muffler (10) forming an exhaust cavity (12); an outer muffler (20) having a second top cover portion (21) and a second mounting hole arranged concentrically with the first mounting hole, the outer muffler (20) covering the inner muffler (10); The outer periphery of the outer muffler (20) is sealed to the outer periphery of the inner muffler (10); the inner wall of the outer muffler (20) and the outer wall of the inner muffler (10) are combined to form at least one back cavity (30); the inner wall of the second top cover portion (21) is in contact with the outer wall of the first top cover portion (11); part of the inner wall of the second top cover portion (21) has a first groove formed by being recessed upward, and / or part of the outer wall of the first top cover portion (11) has a second groove formed by being recessed downward; part of the inner wall of the second top cover portion (21) is in contact with the outer wall of the first top cover portion (11); A hole pipe (40) is formed by aligning between the second grooves, between a part of the outer wall of the first top cover portion (11) and the first groove, and / or between the first groove and the second groove; the back cavity (30) is connected to the exhaust cavity (12) through the hole pipe (40) and the first mounting hole to form an airflow channel; the hole pipe (40) and the back cavity (30) together form a Helmholtz resonance cavity; the extension path of the hole pipe (40) along the extension direction is a curve, a straight line or a broken line, and the hole pipe (40) has at least two holes.

2. The silencing device according to claim 1, characterized in that: The inner radius of the first mounting hole is r1, the inner radius of the inner muffler (10) is r2, the inner radius of the outer muffler (20) is r3, and the overlap ratio between the inner muffler (10) and the outer muffler (20) is t, wherein And t satisfies 0.2≤t≤0.

8.

3. The silencing device according to claim 1, characterized in that: The inner radius of the first mounting hole is r1, the inner radius of the inner silencer (10) is r2, and the length of each hole pipe (40) is L, wherein L satisfies r2-r1 <L。 4. The silencing device according to claim 1, characterized in that: The inner radius of the first mounting hole is r1, the maximum height inside the hole pipe (40) is H, and the total area of ​​the hole pipe (40) projected onto the plane where the cross section of the first mounting hole is located is S, wherein 0.3mm<H<10mm, and S<2πr1H.

5. The silencing device according to claim 1, characterized in that: The inner muffler (10) has a first side wall portion (13) arranged around the first top cover portion (11), and the outer muffler (20) has a second side wall portion (22) arranged around the second top cover portion (21). The outer periphery of the inner muffler (10) is provided with a first outer edge portion (14), and the outer periphery of the outer muffler (20) is provided with a second outer edge portion (23). The upper surface of the first outer edge portion (14), the outer surface of the first side wall portion (13), the lower surface of the second top cover portion (21), and the inner surface of the second side wall portion (22) jointly define the annular cavity of the back cavity (30).

6. The silencing device according to claim 1, characterized in that: The inner radius of the first mounting hole is equal to the inner radius of the second mounting hole.

7. The silencing device according to claim 1, characterized in that: The outer muffler (20) and the inner muffler (10) both have a multi-petal cavity structure or an annular cavity structure; or one of them has a multi-petal cavity structure and the other has an annular cavity structure.

8. The silencing device according to claim 1, characterized in that: An upper flange (24) is formed upwardly on the hole wall of the second mounting hole, and the first top cover portion (11) and the second top cover portion (21) are both flat plate structures.

9. A compressor, characterized in that: include: A housing and a motor and a pump assembly located in the housing, wherein the pump assembly includes a crankshaft, a cylinder, an upper cylinder head, a lower cylinder head and at least one exhaust structure, wherein the exhaust structure is disposed on the upper cylinder head and / or the lower cylinder head and communicates with a compression chamber inside the cylinder; The pump body assembly also includes a silencer device as described in any one of claims 1 to 8, wherein the silencer device covers the side of the upper cylinder head and / or the lower cylinder head away from the cylinder, and the inner silencer (10) of the silencer device and the upper cylinder head and / or the lower cylinder head are combined to form an exhaust chamber (12), and the exhaust chamber (12) is connected to the compression chamber through the exhaust structure. The first mounting hole of the inner silencer (10) and the second mounting hole of the outer silencer (20) are both mounted on the neck of the upper cylinder head and / or the lower cylinder head, and a gap is left between the neck of the upper cylinder head and / or the lower cylinder head, and the exhaust chamber (12) is connected to the hole pipe (40).

Images