CN217712866U - A connecting pipe and no oily air compressor unit for not having oily air compressor unit - Google Patents

Abstract

The application discloses a connecting pipe and no oily air compressor unit for having oil air compressor unit. The connecting pipe comprises a resistance silencing channel and a Venturi channel which are communicated with each other. As set up above, will the resistance amortization passageway of structure with the venturi channel of structure combines together, can realize great transmission loss in great frequency range, finally, the noise reduction effect of connecting pipe is good, can not reduce whole gas circuit pressure drop to and, increase the cost of oilless air compressor unit.

Description

A connecting pipe and no oily air compressor unit for not having oily air compressor unit

Technical Field

The application relates to the technical field of air compressors, in particular to a connecting pipe for an oil-free air compressor unit and the oil-free air compressor unit.

Background

The air compressor unit comprises a main machine, a connecting pipe and an exhaust pipe. The exhaust pipe is connected with a main engine exhaust port of the main engine and the exhaust pipe and is used for inhibiting exhaust pulsation of the main engine and reducing pneumatic noise transmitted to the downstream. For example, the connecting pipe is a venturi pipe.

However, in practical use, the exhaust pipe has a limited noise reduction effect. To further reduce noise, one approach is to add silencers. Because increased the muffler, must make the length increase of the pipeline between host computer gas vent and the blast pipe, for example, can increase the pipeline that muffler and connecting pipe are connected at least, like this, increased the gas circuit pressure drop, moreover, increase the muffler and also can increase oilless air compressor unit cost, for example, material cost and assembly man-hour cost.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a connecting pipe and oily air compressor unit for having no oily air compressor unit. The connecting pipe has good noise reduction effect, can reduce the pressure drop of the whole gas circuit, and can not increase the cost of the oilless air compressor unit.

The application provides a connecting pipe for oilless air compressor unit. The connecting pipe is used for being connected with a main engine exhaust port and an exhaust pipe of the oilless air compressor unit. The connecting pipe comprises a resistance silencing channel and a Venturi channel which are communicated. As set up above, the venturi passageway has less transmission loss in great frequency range, and resistance amortization passageway has great transmission loss in narrower frequency range, combines together resistance amortization passageway and venturi passageway, can have great transmission loss in great frequency range after both are complementary, finally, the noise reduction effect of connecting pipe is good, simultaneously, the connecting pipe also can be so that need not add the muffler between host computer gas vent and the blast pipe, and then, can not reduce whole gas circuit pressure drop to and, increase the cost that does not have oily air compressor unit.

In some embodiments, the resistant muffling channel comprises a first throat and an expansion chamber in communication with the first throat. The first throat comprises a first laryngeal inlet. The expansion chamber includes an expansion chamber bottom wall. The expansion cavity bottom wall is provided with the first laryngeal inlet and is suddenly changed relative to the first laryngeal inlet. The venturi channel comprises a reduced section, a second throat and an expansion section, wherein the reduced section, the second throat and the expansion section are all reduced relative to the expansion cavity. According to the arrangement, the connecting pipe comprises the resistance silencing channel and the Venturi channel, and the reduced section, the second throat and the expansion section of the Venturi channel are reduced relative to the expansion cavity, so that the resistance silencing channel can achieve large transmission loss in a small frequency range, and the Venturi channel with the structure can achieve small transmission loss in a large frequency range.

In some embodiments, the expansion ratio of the expansion lumen to the first throat is 3:1 to 5:1. as set forth above, the resistant muffling passage can achieve a large transmission loss while also avoiding a large pressure drop because, in general, the larger the expansion ratio, the higher the transmission loss, the more significant the noise reduction, but accompanied by a large pressure drop, and by controlling the expansion ratio within the above range, a balance is achieved between the transmission loss and the pressure drop while avoiding a large pressure drop.

In some embodiments, the expansion chamber bottom wall is in a horizontal plane and is plate-like.

In some embodiments, the expansion lumen comprises a junction lumen in communication with the first throat and a tip lumen in communication with the junction lumen, the tip lumen tapering relative to the junction lumen in a direction away from the junction lumen. According to the arrangement, the top cavity is gradually reduced relative to the connecting cavity in the direction far away from the connecting cavity, so that the reactive silencing passage can realize larger transmission loss in a frequency range, and the noise reduction effect is good.

In some embodiments, the top sidewall of the top chamber extends arcuately away from the connecting chamber to achieve the tapering. According to the arrangement, the reactive silencing channel can realize larger transmission loss in a frequency range, and the noise reduction effect is good.

In some embodiments, the first throat is in the shape of a circular truncated cone, and comprises the first throat and a second throat, and the diameter of the first throat is larger than that of the second throat, or the first throat is in the shape of a cylinder. According to the arrangement, no matter the first throat is in a circular truncated cone shape or a cylindrical shape, the structure is matched with the expansion cavity, so that the resistant silencing channel has larger transmission loss in a frequency range, and the noise reduction effect is good.

In some embodiments, the venturi passage has a divergent ratio of 1.6 to 3.2. According to the arrangement, the Venturi channel can achieve large transmission loss in a wider frequency range (for example, the frequency range corresponding to the Venturi channel is wider than that corresponding to the anti-noise silencing channel), and the noise reduction effect is good.

In some embodiments, the reduced section tapers arcuately from the expansion chamber to the second throat, and the expanded section expands arcuately outwardly from the second throat. With the above arrangement, the venturi channel can achieve a large transmission loss in a wider frequency range (for example, the frequency range corresponding to the venturi channel is wider than the frequency range corresponding to the anti-noise silencing channel), and the noise reduction effect is good.

In some embodiments, the connecting tube comprises a transition tube; the transition passage of the transition pipe is connected with the host exhaust port and the first throat, and gradually reduces from the host exhaust port to the first throat. As the arrangement, the transition channel gradually reduces from the host exhaust port to the first throat, so that the expansion ratio is satisfied, the connecting pipe is not too large on the whole, thereby being beneficial to reducing the structure of the connecting pipe and facilitating the arrangement of the connecting pipe in an oil-free air compressor unit.

In some embodiments, at least one of the smallest diameter of the first throat and the smallest diameter of the second throat is 1/2 to 1 of the diameter of the host exhaust. As the arrangement, the ratio of at least one of the minimum diameter of the first throat and the minimum diameter of the second throat to the exhaust port of the main engine is in the range, the expansion ratio is satisfied, the connecting pipe is not too large on the whole, and therefore the structure of the connecting pipe is favorably reduced, and the connecting pipe is convenient to arrange in an oil-free air compressor unit.

In another aspect, embodiments of the present application disclose an oil-free air compressor package. The oil-free air compressor unit comprises any one of the connecting pipes, the main engine and the exhaust pipe. As set forth above, the oilless air compressor set has at least the beneficial effect of connecting pipe, no longer gives unnecessary details.

Drawings

Fig. 1 is a schematic view illustrating a connection pipe for an oil-free air compressor package according to an embodiment of the present application;

fig. 2 is a simulation diagram of a connection pipe according to an embodiment of the present application, illustrating a relationship between a frequency and a transmission loss.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1, a connection pipe for an oil-free air compressor unit is used to connect with an exhaust port and an exhaust pipe of a main unit of the oil-free air compressor unit. Although the structure of the connecting pipe disclosed by the application is different from that of the traditional connecting pipe, the connecting mode of the connecting pipe and the exhaust pipe of the host is the same, and the description is omitted. The connecting pipe comprises a resistance silencing passage 1 and a Venturi passage 2 which are communicated with each other.

Referring to fig. 2 in conjunction with fig. 1, a light gray dashed line B in fig. 2 illustrates a graph of Transmission Loss (Transmission Loss) versus frequency of the venturi channel, and a dark dashed line a illustrates a graph of Transmission Loss versus frequency after the resistant muffling channel 1 and the venturi channel 2 are combined. The venturi channel 2 has a smaller transmission loss in a larger frequency range, the reactive silencing channel 1 has a larger transmission loss in a narrower frequency range, and the reactive silencing channel 1 and the venturi channel 2 are combined, and after the two channels are complemented, the reactive silencing channel 1 and the venturi channel 2 can have a larger transmission loss in a larger frequency range, as shown in fig. 2 in particular, so that the noise reduction effect of the connecting pipe is good. Because the noise reduction effect of connecting pipe is good, adopt behind the connecting pipe, can so need not add the muffler between host computer gas vent and the blast pipe, and then, can not reduce whole gas circuit pressure drop to, increase the cost of oilless air compressor unit.

The structure is not limited based on the functions of the resistant muffling channel 1 and the venturi channel 2. The respective structures of the resistant muffling passage 1 and the venturi passage 2 in the present application will be described below with reference to the accompanying drawings.

Referring to fig. 1, the resistant muffling passageway 1 comprises a first throat 11 and an expansion chamber 12 communicating with the first throat 11. The first throat 11 includes a first throat 111. The expansion chamber 12 includes an expansion chamber bottom wall 120. The dilatation cavity floor 120 is provided with the first laryngeal opening 111 and is abrupt relative to the first laryngeal opening 111. The expansion chamber bottom wall 120 is used as the intersection of the first throat 11 and the expansion chamber 12, the shape of the expansion chamber bottom wall is not limited, and the sudden change between the first throat 11 and the expansion chamber 12 can be realized, and finally, a resistant silencing passage can be formed. The abrupt change between the first throat 11 and the expansion chamber 12 in this application is similar to the abrupt change in the pipe section of the resistant silencer. The venturi channel 2 comprises a reduced section 21, a second throat 22 and a diverging section 23. The reduced section 21, the second throat 22 and the expansion section 23 are each reduced relative to the expansion chamber 12.

According to the above arrangement, since the connecting pipe includes the resistant muffling channel 1 and the venturi channel 2, and the reduced section 21, the second throat 22 and the expanded section 23 of the venturi channel 2 are all reduced relative to the expanded cavity 12, the resistant muffling channel 1 can achieve a large transmission loss in a small frequency range, and the venturi channel 2 of the above structure can achieve a small transmission loss in a large frequency range, so that the resistant muffling channel 1 of the above structure and the venturi channel 2 of the above structure are combined to achieve a large transmission loss in a large frequency range, and finally, the connecting pipe has a good noise reduction effect, and meanwhile, the connecting pipe does not need to add a muffler between the exhaust port and the exhaust pipe of the host machine, so that the pressure drop of the whole air passage is not reduced, and the cost of the oilless air compressor set is increased.

In some embodiments, the expansion ratio of the expansion cavity 12 to the first throat 11 is 3:1 to 5:1, i.e. the ratio D1/D1 in FIG. 1 is 3:1 to 5:1, values within the above ratio range such as, 3: 1. 3.5: 1. 3.8: 1. 4: 1. 4.2: 1. 4.3: 1. 4.5: 1. 4.6: 1. 4.8: 1. 5:1, etc. As set forth above, the reactive muffling passageway 1 can achieve a large transmission loss while avoiding a large pressure drop because, in general, the larger the expansion ratio, the higher the transmission loss, the more significant the noise reduction, but accompanied by a large pressure drop, and by controlling the expansion ratio within the above range, a balance is achieved between the transmission loss and the pressure drop while avoiding a large pressure drop.

In some embodiments, the expansion chamber bottom wall 120 is in a horizontal plane and has a plate shape, which may be a circular plate or other shapes.

With continued reference to FIG. 1, the expansion chamber 12 includes a connecting chamber 121 communicating with the first throat 11 and a top chamber 122 connected to the connecting chamber 121. The top chamber 122 is tapered with respect to the connecting chamber 121 in a direction away from the connecting chamber 121. In the embodiment of the present application, the top chamber 122 tapers down to communicate with the venturi passage 2. The top chamber 122 may be tapered in a variety of ways not limited to the reduction described below. As set forth above, since the top chamber 122 is gradually narrowed in the direction away from the connecting chamber 121 with respect to the connecting chamber 121, the reactive muffler passage 1 can achieve a larger transmission loss in the frequency range, and the noise reduction effect is good.

Referring to fig. 1, the top sidewall 1221 of the top chamber 122 extends in an arc shape away from the connecting chamber 121 to achieve the gradual reduction. As set forth above, the reactive silencing duct 1 can achieve a larger transmission loss in a frequency range, and has a good noise reduction effect. Of course, the tapering may be achieved in other ways, such as, for example, the top sidewall 1221 is beveled.

With reference to fig. 1, the first throat 11 is circular truncated cone, and the first throat 111 and the second throat 112 are included in the first throat 11. The diameter of the first throat opening 111 is larger than the diameter of the second throat opening 112. In other embodiments, the first throat 11 may also be cylindrical. With the above arrangement, no matter the first throat 11 is in the shape of a circular truncated cone or a cylinder, the structure is matched with the expansion cavity 12, so that the reactive silencing channel 1 has larger transmission loss in a frequency range, and the noise reduction effect is good.

With continued reference to fig. 1, the venturi channel 2 has a divergent ratio of 1.6-3.2, for example, a ratio of D2/D2 of 1.6-3.2, which may range from 1.6, 1.8, 2, 2.1, 2.2, 2.4, 2.5, 2.8, 3, 3.1 or 3.2. As set forth above, the venturi channel 2 can achieve a large transmission loss in a wider frequency range (for example, the frequency range corresponding to the venturi channel 2 is wider than the frequency range corresponding to the anti-noise channel 1), and the noise reduction effect is good.

Referring to fig. 1, the reduced section 21 is gradually reduced from the expansion cavity 12 to the second throat 22 in an arc shape, and the expansion section 23 expands from the second throat 22 in an arc shape. With the above arrangement, the venturi channel 2 can achieve a large transmission loss in a wider frequency range (for example, the frequency range corresponding to the venturi channel 2 is wider than the frequency range corresponding to the anti-noise silencing channel 1), and the noise reduction effect is good.

Referring to fig. 1, the connecting pipe includes a transition pipe 3. The transition passage 31 of the transition pipe 3 is connected with the host exhaust port and the first throat 11, and gradually decreases from the host exhaust port to the first throat. As the arrangement, the transition channel 31 gradually reduces from the host exhaust port to the first throat, so that the expansion ratio is satisfied, the connecting pipe is not too large on the whole, thereby being beneficial to reducing the structure of the connecting pipe and facilitating the arrangement of the connecting pipe in an oil-free air compressor unit.

With continued reference to FIG. 1, at least one of the minimum diameter d1 of the first throat 11 and the minimum diameter d2 of the second throat 22 is 1/2 to 1 of the diameter of the exhaust of the host, such as 1/2, 11/20, 3/5, 13/20, 7/10, 3/4, 4/5, 17/20, 9/10, or 1, etc. As set forth above, because the ratio of at least one of d1 and d2 and the host computer gas vent is in above-mentioned scope, will satisfy under the condition of expansion ratio, the connecting pipe is whole not too big to, be favorable to reducing the structure of connecting pipe, be convenient for the connecting pipe overall arrangement in oil-free air compressor unit.

In the above various embodiments, the anti-noise passage 1 is located below the venturi passage 2, so that the airflow passes through the anti-noise passage 1 and then passes through the venturi passage 2. In other embodiments, it is also possible to position venturi channel 2 below anti-muffling channel 1, so that the gas flow passes through the venturi channel and then through anti-muffling channel 1.

In another aspect, embodiments of the present application disclose an oil-free air compressor package. The oil-free air compressor unit comprises any one of the connecting pipes, the main engine and the exhaust pipe.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. The utility model provides a connecting pipe for not having oily air compressor unit, is connected with the host computer gas vent and the blast pipe that do not have oily air compressor unit, its characterized in that, the connecting pipe is including resistance amortization passageway (1) and venturi passageway (2) that are linked together.

2. A connection pipe for an oil-free air compressor package as claimed in claim 1, wherein the resistant muffling channel (1) comprises a first throat (11) and an expansion chamber (12) communicating with the first throat (11), the first throat (11) comprising a first throat opening (111); the expansion chamber (12) comprises an expansion chamber bottom wall (120); the dilatation cavity bottom wall (120) is provided with the first laryngeal opening (111) and is abrupt relative to the first laryngeal opening (111);

the venturi channel (2) comprises a reduced section (21), a second throat (22) and an expanded section (23); the reduction section (21), the second throat (22) and the expansion section (23) are each reduced relative to the expansion chamber (12).

3. A connection pipe for an oil-free air compressor package according to claim 1 or 2, characterized in that the expansion ratio of the resistant muffling channel (1) is 3:1 to 5:1.

4. a connection pipe for an oil-free air compressor package as claimed in claim 2, wherein the expansion chamber (12) comprises a connection chamber (121) communicating with the first throat (11) and a top chamber (122) connected with the connection chamber (121); the top cavity (122) is gradually reduced relative to the connecting cavity (121) in the direction away from the connecting cavity (121);

and/or the reduction section (21) is gradually reduced from the expansion cavity (12) to the second throat (22) in an arc shape, and the expansion section (23) is expanded from the second throat (22) outwards in an arc shape.

5. A connection tube for an oil-free air compressor package as claimed in claim 4, characterized in that the top side wall (1221) of the top chamber (122) extends arcuately away from the connection chamber (121) to achieve the tapering.

6. A connection tube for an oil-free air compressor package as claimed in claim 2, wherein the first throat (11) is frustoconical, comprising the first throat (111) and a second throat (112); the diameter of the first throat opening (111) is larger than that of the second throat opening (112), or the first throat opening (11) is cylindrical;

and/or the expansion chamber bottom wall (120) is in a plate shape and is positioned on a horizontal plane.

7. A connection pipe for an oil-free air compressor unit as claimed in claim 1, wherein the venturi channel (2) has a divergent ratio of 1.6-3.2.

8. A connection pipe for an oil-free air compressor package as claimed in claim 2, characterized in that the connection pipe comprises a transition pipe (3); and a transition passage (31) of the transition pipe (3) is connected with the host exhaust port and the first throat (11) and gradually reduces from the host exhaust port to the first throat (11).

9. A connection pipe for an oil-free air compressor unit as claimed in claim 2, wherein at least one of the minimum diameter of the first throat (11) and the minimum diameter of the second throat (22) is 1/2-1 of the diameter of the main unit discharge port.

10. An oil-free air compressor package comprising the connecting pipe of any one of claims 1 to 9, the main unit, and the discharge pipe.

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