Silencer for small air extraction pump

Abstract

The present disclosure relates to a kind of sound attenuation device for small air extraction pump, sound attenuation device includes the sound attenuation matrix of solid cylinder structure and the wrapping part of being sleeved in the outside of sound attenuation matrix;Sound attenuation matrix both ends are equipped with the connecting hole extending from end face to inside, two connecting holes are not communicated, and connecting hole is used to connect sound attenuation matrix with air extraction pump air duct together in series;The outer periphery of the middle part of sound attenuation matrix is equipped with outer thread, and the outer periphery of the both ends of sound attenuation matrix is respectively equipped with radial through-hole corresponding with connecting hole and first boss located on the outside of through-hole;Radial through-hole is located on the outside of outer thread;The wrapping part is sealed between two first bosses, and the inner periphery of wrapping part and the outer periphery of first boss, outer thread are all abutted, so that the gap between first boss and outer thread, the gap between the thread of outer thread form spiral air duct, and spiral air duct is communicated with connecting hole by through-hole.The present disclosure device structure is compact and simple, applicable to each small equipment, effectively reduce the noise generated by airflow vibration.

Description

Technical Field

[0001] This disclosure relates to the field of noise control technology, and in particular to a silencer for a small air pump. Background Technology

[0002] Fixed online gas analyzers require a pump to draw gas from each sampling point into the instrument for real-time analysis. After analysis, the gas is discharged, and the airflow vibration generated during the discharge causes noise.

[0003] Fixed online gas analyzers typically use small air pumps with a flow rate of less than 5 L / min. Currently, due to installation requirements, it is necessary to silence the gas inside the instrument before venting it, but existing silencers are not suitable for installation inside the instrument in terms of size and installation method. Utility Model Content

[0004] In view of this, the present disclosure provides a silencer for a small air pump. The device has a compact and simple structure, is suitable for various small devices, and can effectively reduce the noise generated by airflow vibration.

[0005] This disclosure is achieved through the following technical solution: a silencing device for a small air pump, the silencing device comprising a solid cylindrical silencing base and a wrapping part fitted outside the silencing base; both ends of the silencing base are provided with connecting holes extending inward from the end faces, the two connecting holes are not interconnected, the connecting holes are used to connect the silencing base and the air passage of the air pump in series; the outer peripheral surface of the middle part of the silencing base is provided with an external thread, and the outer peripheral surfaces of both ends of the silencing base are respectively provided with radial through holes corresponding to the connecting holes and a first boss located outside the through holes; the radial through holes are located outside the external threads; the wrapping part is sealed between the two first bosses, and the inner peripheral surface of the wrapping part abuts against the outer peripheral surface of the first bosses and the external threads, so that the gap between the first bosses and the external threads and the gap between the threads of the external threads constitute a spiral air passage, the spiral air passage is connected to the connecting holes through the through holes.

[0006] Furthermore, the outer diameter of the first boss is the same as the outer diameter of the external thread.

[0007] Furthermore, a second boss is provided on the outer side of the first boss, the outer diameter of the second boss is not less than the outer diameter of the wrapping part, and the end face of the second boss facing the wrapping part abuts against the wrapping part.

[0008] Furthermore, the silencing device also includes a silencing shell, which is fitted over the wrapping part and encloses the wrapping part between the silencing shell and the silencing base.

[0009] Furthermore, the connecting hole is arranged along the axis of the sound-absorbing substrate.

[0010] Furthermore, the wrapping part is made of silicone with sound-absorbing function.

[0011] Furthermore, one of the connection holes is connected to the air pump duct via a quick-connect fitting with an air duct; the other connection hole is connected to an external pipe via a quick-connect fitting with an air duct.

[0012] Compared with existing technologies, the beneficial effects of this disclosure are:

[0013] 1. The silencing device disclosed herein includes a silencing base with a spiral air passage. Under the sealing of the encapsulation part, the spiral air passage is connected only through the through hole and the connecting hole, thereby connecting with the air pump passage through the connecting hole. The airflow in the air passage can only flow from one end of the silencing base to the other end through the spiral air passage in the silencing device, thereby achieving silencing and noise reduction. The overall structure of the silencing device is compact and can be directly installed inside small instruments or equipment, making installation quick and space-saving.

[0014] 2. The outer diameter of the first boss of the silencing substrate of this disclosure is the same as the outer diameter of the external thread, ensuring the flatness of the inner circumferential surface of the wrapping part, so that the airflow flows smoothly in the spiral air passage and achieves a better silencing effect.

[0015] 3. The radius of the outer circumference of the second boss in this disclosure is not less than the outer diameter of the wrapping part, and the inner end face of the second boss abuts against the wrapping part, further ensuring the airtightness of the spiral air passage. The inner end face of the second boss refers to the end face facing the wrapping part.

[0016] 4. The packaging part of this invention uses silicone with certain elasticity and sound absorption function. With the cooperation of sound-absorbing silicone and spiral air passage, the noise of airflow in the air pump passage is controlled below 40dB. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection between the present disclosure and the quick connector.

[0018] Figure 2 This is a schematic diagram of the sound-absorbing substrate structure disclosed in this paper.

[0019] Figure 3 This is a longitudinal section of the sound-absorbing substrate disclosed in this publication.

[0020] Among them, 1-quick connector, 2-silencing shell, 3-silencing base, 4-wrapping part, 30-external thread, 31-spiral air passage, 32-through hole, 33-connecting hole, 34-first boss, 35-second boss, 36-connecting part. Detailed Implementation

[0021] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] This disclosure provides a silencer for a small air pump, such as Figure 1 As shown, the silencing device includes a solid cylindrical silencing base 3 and a wrapping part 4 fitted outside the silencing base 3.

[0023] Both ends of the silencing base 3 are provided with connecting holes 33 extending inward from the end face. "Extending inward" means extending from one end of the silencing base 3 to the other end. The two connecting holes 33 are not interconnected and are used to connect the silencing base 3 in series with the air passage of the suction pump. Preferably, the connecting holes 33 are arranged along the axis of the silencing base 3.

[0024] like Figure 2 , Figure 3 As shown, the outer peripheral surface of the middle part of the silencing base 33 is provided with an external thread 30. The outer peripheral surfaces of both ends of the silencing base 33 are respectively provided with radial through holes 32 that communicate with the connecting holes 33 and a first boss 34 located outside the through holes 32. The outside of the through holes 32 refers to the side of the through holes 32 that is close to the end face of the silencing base 33. That is to say, the through holes 32 are located between the first boss 34 and the external thread 30, and the radius of the outer peripheral surface where the through holes 32 are located is smaller than the radius of the outer peripheral surface of the first boss 34 and the outer diameter of the external thread 30.

[0025] The wrapping part 4 is sealed between the two first protrusions 34, and the inner circumferential surface of the wrapping part 4 abuts against the outer circumferential surface of the first protrusion 34 and the external thread 30, so that the gap between the first protrusion 34 and the external thread 30 and the gap between the threads of the external thread 30 form a continuous spiral air passage 31, and the spiral air passage 31 is connected to the connecting hole 33 through the through hole 32.

[0026] The wrapping part 4 is made of elastic material, such as synthetic rubber. There are no restrictions on the specific material of the wrapping part 4. It is only necessary to ensure that the wrapping part 4 can tightly cover and seal the outside of the sound-absorbing base 3, so that the spiral air passage 31 can only be connected to the outside through the through hole 32. That is, the airflow entering from the through hole 32 can only flow from one end of the sound-absorbing base 3 to the other end of the sound-absorbing base 3 through the spiral air passage 31.

[0027] Preferably, the material of the wrapping part 4 can be an elastic material with sound absorption function. For example, in this embodiment, the wrapping part 4 is made of silicone with certain elasticity and sound absorption function. With the cooperation of the sound-absorbing silicone and the spiral airway 31, the noise of the airflow in the suction pump is controlled below 40dB. The overall structure of the noise reduction device is compact and can be directly connected in series in the suction pump airway inside the gas analyzer, so that the instrument can maintain a relatively quiet environment when it is working.

[0028] The silencing device also includes a silencing housing 2, which is fitted over the enclosure 4 and encloses the enclosure 4 between the silencing housing 2 and the silencing base 3.

[0029] As an improvement, the outer diameter (outer circumferential radius) of the first boss 34 of the silencing base 3 is the same as the outer diameter of the external thread 30, ensuring the flatness of the inner circumferential surface of the wrapping part 4, so that the airflow flows smoothly in the spiral air passage 31, achieving a better silencing effect.

[0030] As a further improvement, a second boss 35 is provided on the outer side of the first boss 34. The outer side of the first boss 34 refers to the side of the first boss 34 that is close to the end face of the sound-absorbing substrate 3. The radius of the outer circumferential surface of the second boss 35 is not less than the outer diameter of the wrapping part 4, and the inner end face of the second boss 35 abuts against the wrapping part 4 to further ensure the airtightness of the spiral air passage 31. The inner end face of the second boss 35 refers to the end face facing the wrapping part 4.

[0031] In some embodiments, a connecting portion 36 is provided on the outer side of one or both of the second bosses 35, where the outer side of the second boss 35 refers to the side of the second boss 35 near the end face of the sound-absorbing base 3. The connecting portion 36 can be used for threaded connection with the sound-absorbing housing 2.

[0032] In some embodiments, one connection hole 33 is connected to the air pump duct via a quick connector 1 with an air duct; the other connection hole 33 is connected to an external pipe via a quick connector 1 with an air duct. Specifically, the end of the connection hole 33 near the end face of the silencer base 3 has an internal thread. One end of each of the two quick connectors 1 is threaded to the two connection holes 33. The other end of one quick connector 1 is connected to the air pump duct, and the other end of the other quick connector 1 is connected to a designated location via an external pipe. The air pump duct and the external pipe are connected to the connection hole 33 of the silencer device via the two quick connectors 1, and then connected to the spiral air duct 31 via a through hole 32 communicating with the connection hole 33.

[0033] When the air pump starts pumping air, the airflow flows from the air pump's air passage through the quick connector 1 connected to it, enters the connection hole 33 at one end of the silencing base 3, passes through the through hole 32 at that end, enters the spiral air passage 31, flows through the entire spiral air passage 31, and then enters the connection hole 33 at the other end through the through hole 32 at the other end of the silencing base 3. Finally, it flows into the peripheral pipeline through the quick connector 1 at the other end, completing the airflow noise reduction. This silencing device not only has good noise reduction function, but also has a simple structure, low cost, and strong environmental adaptability, and has good application prospects.

[0034] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A silencer for a small air pump, characterized in that, The silencing device includes a solid cylindrical silencing base and a wrapping part fitted outside the silencing base; Both ends of the sound-absorbing base are provided with connecting holes extending inward from the end face. The two connecting holes are not connected to each other. The connecting holes are used to connect the sound-absorbing base to the air duct of the air pump in series. The outer peripheral surface of the middle part of the sound-absorbing base is provided with an external thread, and the outer peripheral surfaces of both ends of the sound-absorbing base are respectively provided with radial through holes corresponding to the connecting holes and a first boss located outside the through holes; the radial through holes are located outside the external threads. The wrapping part is sealed between the two first protrusions, and the inner circumferential surface of the wrapping part abuts against the outer circumferential surface and the external thread of the first protrusion, so that the gap between the first protrusion and the external thread and the gap between the threads of the external thread form a spiral air passage. The spiral air passage is connected to the connecting hole through the through hole.

2. The silencer for a small air pump as described in claim 1, characterized in that, The outer diameter of the first boss is the same as the outer diameter of the external thread.

3. The silencer for a small air pump as described in claim 1, characterized in that, A second boss is provided on the outer side of the first boss. The outer diameter of the second boss is not less than the outer diameter of the wrapping part, and the end face of the second boss facing the wrapping part abuts against the wrapping part.

4. The silencer for a small air pump as described in claim 1, characterized in that, The noise reduction device also includes a noise reduction shell, which is fitted over the outer part of the enclosure and seals the enclosure between the noise reduction shell and the noise reduction base.

5. The silencer for a small air pump as described in claim 1, characterized in that, The connecting hole is located along the axis of the sound-absorbing substrate.

6. The silencer for a small air pump as described in claim 1, characterized in that, The wrapping part is made of silicone with sound-absorbing properties.

7. The silencer for a small air pump as described in any one of claims 1-6, characterized in that, One of the connection holes is connected to the air pump duct via a quick-connect fitting with an air duct; the other connection hole is connected to the external pipeline via a quick-connect fitting with an air duct.

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