CN217558558U

CN217558558U - Screw vacuum pump muffler

Info

Publication number: CN217558558U
Application number: CN202221833414.9U
Authority: CN
Inventors: 高峰; 王国清; 袁聪; 陈梓洋; 王永刚
Original assignee: Suzhou Canghai Vacuum Machinery Co ltd
Current assignee: Suzhou Canghai Vacuum Machinery Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-10-11
Anticipated expiration: 2032-07-15

Abstract

A screw vacuum pump silencer belongs to the technical field of vacuum pump silencing devices. Including casing, air inlet, gas vent and one-way check valve, the air inlet include return bend, air inlet flange and air inlet mesh pipe, air inlet mesh pipe extend into the shell intracavity, one-way check valve set up the terminal surface at the casing, the one end intercommunication gas vent of one-way check valve, the other end is connected with the exhaust mesh pipe, exhaust mesh pipe extend into the shell intracavity, the shell chamber separate through first baffle and second baffle and form first amortization room, second amortization room and third amortization room, first baffle on the interval be provided with a plurality of first amortization pipes, the second baffle on the interval be provided with a plurality of second amortization pipes, second amortization pipe run through to third amortization room one side from second amortization room one side. The advantages are that: the exhaust temperature and the airflow noise of the vacuum pump can be effectively reduced; the volume is small, the screw vacuum pump is more compact, and the occupied space of the whole machine is smaller.

Description

Silencer of screw vacuum pump

Technical Field

The utility model belongs to the technical field of the vacuum pump silencing device, concretely relates to screw vacuum pump muffler.

Background

The oil-free screw vacuum pump is an air pumping device which utilizes a pair of screws to synchronously rotate in a high speed and reverse direction in a pump shell to generate air suction and exhaust functions. In the process of screw rotation, the positions of a pair of screw rods are constantly moved backwards while being meshed with each other, so that gas in a pump shell is constantly compressed towards an exhaust port, the gas generates heat constantly in the compression process, the exhaust temperature of the screw pump is high, inconvenience is brought to use, meanwhile, because reverse flow impact is serious during gas compression, air near the exhaust port of the vacuum pump can flow back and forth, the exhaust port of the screw vacuum pump vibrates, a large amount of airflow noise waves and the surrounding environment are generated, noise pollution is formed, and particularly, great influence is generated on workers in the operation environment. Therefore generally can install the muffler additional at the gas vent, but current muffler can adopt great inner chamber to design very long amortization route for obtaining better noise reduction effect for equipment is bulky, and occupation space is many, increases the limitation for the application.

In view of the above-mentioned prior art, there is a need for an improved design of the known screw vacuum pump, for which reason the applicant has made an advantageous design, the solution to be described below being created in this context.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screw vacuum pump muffler can effectively reduce the exhaust temperature and the air current noise of vacuum pump.

The utility model aims at reaching like this, a screw vacuum pump muffler, including casing, air inlet and gas vent, the casing include skin and cover and establish at the intraformational inlayer of skin, the lateral wall of outer inside wall and inlayer between the clearance constitute for cooling chamber, the inner chamber of inlayer constitute for the shell chamber, the casing is provided with the water inlet on the lateral wall of length direction's one end, and is provided with the delivery port on the lateral wall of length direction's the other end, water inlet and delivery port all with cooling chamber be linked together its characterized in that: still include one-way check valve, the air inlet include the return bend, connect the inlet flange of return bend one end and connect the mesh pipe that admits air at the return bend other end, the mesh pipe that admits air extend into the shell intracavity from the terminal surface of the length direction of casing, one-way check valve set up at the another terminal surface of the length direction of casing, the one end intercommunication gas vent of one-way check valve, the other end is connected with exhaust mesh pipe, exhaust mesh pipe extend into the shell intracavity, the shell chamber through set up first baffle and second baffle and separate formation first amortization room, second amortization room and third amortization room in length direction goes up the interval, first baffle on the interval be provided with a plurality of first amortization pipes, first amortization pipe run through to second amortization room one side from first amortization room one side, the second baffle on the interval be provided with a plurality of second amortization pipes, second amortization pipe run through to third amortization room one side from second amortization room one side.

In a specific embodiment of the present invention, the first muffling tube and the second muffling tube are staggered and uniformly distributed.

The utility model discloses a another concrete embodiment, one-way check valve include valve body, case and spring, the bottom and the casing fixed mounting of valve body, the centre of valve body is formed with the orientation gas vent open-ended valve pocket to bottom at the valve pocket form with the exhaust through hole of shell chamber intercommunication, exhaust mesh pipe and the bottom of valve body be connected the installation and with exhaust through hole intercommunication, the case install in the bottom of valve pocket, and outwards be formed with the cavity towards, the one end of spring hold in this cavity, the opening adaptation installation of gas vent and valve pocket, the other end and the gas vent of spring inconsistent.

In another specific embodiment of the present invention, the casing is provided with two liquid discharging ports on two end faces in the length direction.

In another specific embodiment of the present invention, the side wall of the air inlet mesh pipe is uniformly distributed with a plurality of air inlet mesh pipe through holes, and the side wall of the exhaust mesh pipe is uniformly distributed with a plurality of exhaust mesh pipe through holes.

The utility model discloses owing to adopted above-mentioned structure, compared with prior art, the beneficial effect who has is: the screw vacuum pump is small in size, light in weight, suitable for horizontal lower-row installation, and capable of enabling the screw vacuum pump to be more compact and the occupied space of the whole machine to be smaller; the gas is diffused and discharged to the shell cavity through the bent pipe and the gas inlet mesh pipe and collides with the inner wall of the shell cavity, so that the cooling effect on the gas is enhanced; the structure that the silencing pipes are communicated with the silencing chamber obviously attenuates the noise of the atmospheric flow, and further improves the silencing effect; the one-way check valve can effectively eliminate the vibration noise generated by small airflow, and simultaneously has the function of preventing gas from flowing backwards, thereby improving the use safety of the screw vacuum pump.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention.

Fig. 3 isbase:Sub>A schematic cross-sectional view atbase:Sub>A-base:Sub>A in fig. 2.

Fig. 4 is a schematic cross-sectional view at B-B in fig. 2.

Fig. 5 is an exploded view of the check valve of the present invention.

In the figure: 1. a shell, 11 an outer layer, 12 an inner layer, 13 a cooling cavity, 14 a shell cavity, 141 a first silencing chamber 142, a second silencing chamber, 143, a third silencing chamber, 15, a water inlet, 16, a water outlet and 17, a liquid discharging port; 2. the air inlet, the bent pipe 21, the air inlet flange 22, the air inlet mesh pipe 23, the air inlet mesh pipe 231 and the air inlet mesh pipe through holes; 3. an exhaust port; 4. a one-way check valve; 41. valve body 411, valve cavity 412, exhaust through hole 42, valve core 421, cavity 43, spring; 5. exhaust mesh pipe, 51, exhaust mesh pipe through hole; 6. a first partition plate 61, a first silencer duct; 7. second baffle plate 71, second hush pipe.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept related to the directionality (or the directional property) of up, down, left, right, front, and rear is intended for the position state of the drawing being described, and is intended to facilitate understanding by the public, and thus should not be construed as a limitation to the technical solution provided by the present invention.

Referring to fig. 1 and 2, the present invention relates to a silencer for a screw vacuum pump, which is small in size, light in weight, suitable for horizontal installation, installed at the bottom of the vacuum pump, does not occupy extra space, and can make the screw vacuum pump more compact. The traditional silencer is mostly installed in a vertical mode and is installed on the edge of a vacuum pump, and therefore the traditional silencer not only occupies the ground, but also occupies the three-dimensional space. The muffler includes a housing 1, an intake port 2, and an exhaust port 3. The shell 1 comprises an outer layer 11 and an inner layer 12 sleeved in the outer layer 11, a cooling cavity 13 is formed by a gap between the inner side wall of the outer layer 11 and the outer side wall of the inner layer 12, and a shell cavity 14 is formed by an inner cavity of the inner layer 12. The side wall of one end of the shell 1 in the length direction is provided with a water inlet 15, the side wall of the other end of the shell in the length direction is provided with a water outlet 16, and the water inlet 15 and the water outlet 16 are both communicated with the cooling cavity 13. External cooling water enters the cooling cavity 13 through the water inlet 15 and is discharged from the water outlet 16, the cooling cavity 13 cools the shell cavity 14, and exhaust gas is cooled. The shell 1 is provided with two liquid discharging ports 17 on two end surfaces in the length direction.

The air inlet 2 comprises an elbow pipe 21, an air inlet flange 22 connected to one end of the elbow pipe 21 and an air inlet mesh pipe 23 connected to the other end of the elbow pipe 21. The air inlet flange 22 is used for connecting a vacuum pump. The air inlet mesh pipe 23 extends into the shell cavity 14 from one end face of the length direction of the shell 1, and a plurality of air inlet mesh pipe through holes 231 are uniformly distributed on the side wall. Casing 1 another terminal surface at length direction be provided with one-way check valve 4, one end intercommunication gas vent 3 of one-way check valve 4, the other end is connected with exhaust mesh pipe 5, exhaust mesh pipe 5 extend into shell chamber 14 in, evenly distributed has a plurality of exhaust mesh pipe through-holes 51 on the lateral wall of exhaust mesh pipe 5. Specifically, referring to fig. 5, the check valve 4 includes a valve body 41, a valve core 42, and a spring 43. The bottom of the valve body 41 is fixed to the housing 1, a valve chamber 411 opening to the exhaust port 3 is formed in the middle of the valve body 41, and an exhaust through hole 412 communicating with the housing chamber 14 is formed in the bottom of the valve chamber 411. The exhaust mesh pipe 5 is connected with the bottom of the valve body 41 and communicated with the exhaust through hole 412, the valve core 42 is installed at the bottom of the valve cavity 411 and is provided with a concave cavity 421 facing outwards, one end of the spring 43 is accommodated in the concave cavity 421, the exhaust port 3 is installed in a manner of being matched with the opening of the valve cavity 411, and the other end of the spring 43 is abutted to the exhaust port 3. When there is gas in the housing chamber 14 flowing to the exhaust port 3, the gas flow lifts the valve element 42 and is discharged to the outside through the exhaust port 3. The spring 43 is used for resetting the valve core 42.

Referring to fig. 2, 3 and 4, the shell cavity 14 is provided with a first partition plate 6 and a second partition plate 7 at intervals along the length direction, and the first partition plate 6 and the second partition plate 7 partition the shell cavity 14 into a first muffling chamber 141, a second muffling chamber 142 and a third muffling chamber 143 which are sequentially arranged from left to right. The first partition plate 6 is provided with a plurality of first muffling pipes 61 at intervals, and the first muffling pipes 61 penetrate from the first muffling chamber 141 side to the second muffling chamber 142 side, that is, the first muffling chamber 141 and the second muffling chamber 142 are communicated. The second partition 7 is provided with a plurality of second muffling pipes 71 at intervals, and the second muffling pipes 71 penetrate from the second muffling chamber 142 side to the third muffling chamber 143 side, that is, the second muffling chamber 142 and the third muffling chamber 143 are communicated with each other. The first silencing pipe 61 and the second silencing pipe 71 are staggered and uniformly distributed with each other. In the present embodiment, the number of the first silencing tubes 61 and the second silencing tubes 71 is four, and the first silencing tubes 61 and the second silencing tubes 71 are distributed in a field shape, and the distribution of the second silencing tubes 71 is rotated by 90 degrees with respect to the first silencing tubes 61.

The gas exhausted by the screw vacuum pump enters from the gas inlet 2, is diffused and exhausted to the first silencing chamber 141 sequentially through the bent pipe 21 and the gas inlet mesh pipe 23, and collides with the inner layer 12 of the shell 1, so that the cooling effect on the gas is enhanced. The gas enters the second muffling chamber 142 through the first muffling tube 61, and then the gas enters the third muffling chamber 143 through the second muffling tube 71 after being expanded and disturbed. The structure of a plurality of hush pipes intercommunication hush chamber, it is obvious to atmospheric flow noise attenuation, and the noise cancelling effect further obtains promoting. Finally, the gas enters the one-way check valve 4 through the exhaust mesh pipe 5, and is exhausted from the exhaust port 3 after the valve core 42 is jacked open. Screw vacuum pump is at less air displacement during operation, produces the noise that gas vibrates easily, and the vibration noise that little air current produced can effectively be eliminated to one-way check valve 4, has also played the palirrhea effect of preventing gas simultaneously, can improve the security that screw vacuum pump used from this.

Claims

1. The utility model provides a screw vacuum pump muffler, includes casing (1), air inlet (2) and gas vent (3), casing (1) including skin (11) and cover establish inlayer (12) in skin (11), the inside wall of skin (11) and the clearance between the lateral wall of inlayer (12) constitute cooling chamber (13), the inner chamber of inlayer (12) constitute for shell chamber (14), casing (1) is provided with water inlet (15) on the lateral wall of length direction's one end, and is provided with delivery port (16) on the lateral wall of length direction's the other end, water inlet (15) and delivery port (16) all with cooling chamber (13) be linked together, its characterized in that: the air inlet (2) comprises a bent pipe (21), an air inlet flange (22) connected to one end of the bent pipe (21) and an air inlet mesh pipe (23) connected to the other end of the bent pipe (21), the air inlet mesh pipe (23) extends into the shell cavity (14) from one end surface of the shell body (1) in the length direction, the one-way check valve (4) is arranged on the other end face of the shell (1) in the length direction, one end of the one-way check valve (4) is communicated with the exhaust port (3), the other end of the one-way check valve is connected with an exhaust mesh pipe (5), the exhaust mesh pipe (5) extends into the shell cavity (14), the shell cavity (14) is provided with a first clapboard (6) and a second clapboard (7) at intervals in the length direction to form a first silencing chamber (141), a second silencing chamber (142) and a third silencing chamber (143) in a separating way, a plurality of first silencing tubes (61) are arranged on the first clapboard (6) at intervals, the first silencing pipe (61) penetrates from the first silencing chamber (141) side to the second silencing chamber (142) side, a plurality of second silencing tubes (71) are arranged on the second clapboard (7) at intervals, the second silencing tube (71) penetrates from the second silencing chamber (142) side to the third silencing chamber (143) side.

2. A silencer for a screw vacuum pump according to claim 1, characterized in that the first silencer duct (61) and the second silencer duct (71) are evenly distributed offset from each other.

3. The muffler for the screw vacuum pump as claimed in claim 1, wherein the check valve (4) comprises a valve body (41), a valve core (42) and a spring (43), the bottom of the valve body (41) is fixedly mounted with the housing (1), a valve cavity (411) opening toward the exhaust port (3) is formed in the middle of the valve body (41), an exhaust through hole (412) communicating with the housing cavity (14) is formed in the bottom of the valve cavity (411), the exhaust mesh pipe (5) is connected with the bottom of the valve body (41) and communicated with the exhaust through hole (412), the valve core (42) is mounted at the bottom of the valve cavity (411) and outwardly forms a cavity (421), one end of the spring (43) is accommodated in the cavity (421), the exhaust port (3) is fittingly mounted with the opening of the valve cavity (411), and the other end of the spring (43) abuts against the exhaust port (3).

4. A silencer for a screw vacuum pump according to claim 1, characterized in that the casing (1) is provided with tapping holes (17) at both end surfaces in the length direction.

5. The silencer of the screw vacuum pump as claimed in claim 1, wherein a plurality of air inlet mesh pipe through holes (231) are uniformly distributed on the side wall of the air inlet mesh pipe (23), and a plurality of exhaust mesh pipe through holes (51) are uniformly distributed on the side wall of the exhaust mesh pipe (5).