Low-pressure screw vacuum pump with built-in silencer

Abstract

The utility model discloses a low-pressure screw vacuum pump with a built-in silencer, which relates to the field of low-pressure screw vacuum pumps and comprises a shell, a screw pump host is mounted at a fixed position in the shell, and an air outlet port of the screw pump host is fixedly connected with one air port of a silencer main body through a bent pipe. The silencer body is located below the screw pump main machine, and an extraction opening of the screw pump main machine is arranged upwards, penetrates through a top plate of the shell and extends out of the shell. According to the utility model, air compression and delivery are realized by utilizing the rotary motion of the screw rotor of the main engine of the screw pump, the silencer main body is arranged at the position of the exhaust port through the processes of suction, compression, cooling, lubrication, sealing, exhaust and the like, and the noise in the silencer main body is reduced through glass wool; the low-pressure screw vacuum pump can provide clean, efficient and reliable aerodynamic force, and meanwhile the low-pressure screw vacuum pump has the advantages of being low in noise, efficient, reliable, safe, environmentally friendly and economical.

Description

Technical Field

[0001] The utility model relates to the field of low-pressure screw vacuum pumps, in particular to a low-pressure screw vacuum pump with a built-in muffler. Background Art

[0002] Screw vacuum pump is a common vacuum pump. It is a device that uses mechanical force to extract gas or liquid from a container. It has a simple structure, is easy to operate and reliable. The working medium is air (or other non-corrosive clean gas) and oily substances such as lubricating oil, which will not pollute the surface of the vacuumed object. It can be used continuously for a long time without leakage, so it is widely used. Screw air compressor has become the new mainstream of the development of air compressors today. Compared with piston compressors of the same power, it has incomparable advantages, superior performance and reliability. The precise matching between the main and auxiliary rotors and between the rotor and the body shell reduces gas reflux leakage and improves efficiency.

[0003] There are still some problems with screw vacuum pumps in daily use: Screw vacuum pumps will generate friction and vibration when extracting gas, resulting in noise. In addition, environmental factors such as reflection and propagation in space will also increase the degree of noise. The impact of noise on screw vacuum pumps and the noise of screw vacuum pumps on operators and the surrounding working environment cannot be ignored. High noise levels may cause hearing damage, reduced work efficiency and have a negative impact on the health of workers.

[0004] Therefore, it is necessary to invent a low-pressure screw vacuum pump with a built-in muffler to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a low-pressure screw vacuum pump with a built-in silencer to solve the problem that the screw vacuum pump proposed in the above background technology will generate friction and vibration when extracting gas, resulting in the generation of noise. In addition, environmental factors such as reflection and propagation in space will also increase the degree of noise. The impact of noise on the screw vacuum pump and the noise of the screw vacuum pump on the operator and the surrounding working environment have an impact that cannot be ignored. High noise levels may cause hearing damage, reduced work efficiency and have a negative impact on the health of workers.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-pressure screw vacuum pump with a built-in silencer, comprising a shell, a screw pump main unit is installed at a fixed position inside the shell, and the air outlet port of the screw pump main unit is fixedly connected to an air port of the muffler main unit through a bent pipe, the muffler main unit is located below the screw pump main unit, the air suction port of the screw pump main unit is arranged upward, the air suction port passes through the top plate of the shell and extends to the outside of the shell, an oil pump is fixedly installed at the internal base position of the shell, and the oil pump is fixedly connected to the oil tank through an oil pipe, and the oil pipe is fixedly connected to the oil inlet of the screw pump main unit.

[0007] Preferably, the muffler body includes an air inlet, a welded steel pipe, a carbon steel pipe, a muffler reducer, a stainless steel mesh plate, a short section flanging pipe and an air outlet, and the end of the air inlet is integrally welded with one end of the carbon steel pipe through the welded steel pipe and the muffler reducer, and the end of the carbon steel pipe away from the air inlet is integrally welded with the air outlet through the short section flanging pipe and the muffler reducer, thereby ensuring the stability of the installation of the muffler body and ensuring the maximum absorption of noise by the muffler body, thereby avoiding noise problems from causing harm to the staff and the machine body.

[0008] Preferably, the air inlet on one side of the muffler body is fixedly connected to the air outlet port of the screw pump main unit via a flange, and the air outlet on one side of the muffler body passes through a side wall of the outer shell and extends to the outside of the outer shell, which facilitates the correct installation of the muffler body and ensures the subsequent normal operation of the muffler body.

[0009] Preferably, a stainless steel mesh plate is provided on the inner side of the carbon steel pipe, and the internal compartment of the carbon steel pipe is filled with a glass wool interlayer, which can effectively block sound waves, create a quiet space environment, and ensure that the harm caused by noise is reduced when the silencer body is in use.

[0010] Preferably, an oil sight glass is provided on the outside of the oil tank body, and a breathable cap is provided on the top of the oil tank, so that the internal conditions of the oil tank can be observed through the oil sight glass.

[0011] Preferably, the pipe mouth of the oil pipe is connected to the oil filter through an oil filter seat to filter the used oil to ensure the quality of the oil, thereby extending the service life of the device.

[0012] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0013] The utility model utilizes the rotational motion of the spiral rotor of the main engine of the screw pump to realize the compression and transportation of air, and goes through the processes of suction, compression, cooling, lubrication, sealing and exhaust, wherein a muffler body is arranged at the exhaust port position, and the glass wool in the muffler body is used to reduce the noise, so that the low-pressure screw vacuum pump can provide clean, efficient and reliable air power, and at the same time has the characteristics of low noise, high efficiency, reliability, safety, environmental protection and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0016] Figure 2 It is a three-dimensional diagram of the overall structure of the utility model (without the outer shell);

[0017] Figure 3 This is a stereoscopic diagram of the overall structure of the muffler main body of the utility model;

[0018] Figure 4 It is a schematic plan view of the internal structure of the muffler main body of the utility model.

[0019] Description of reference numerals:

[0020] 1. Shell; 2. Air extraction port; 3. Screw pump main unit; 4. Muffler body; 41. Air inlet; 42. Welded steel pipe; 43. Carbon steel pipe; 44. Muffler reducer plate; 45. Stainless steel mesh plate; 46. Short section flanged pipe; 47. Air outlet; 5. Oil pipe; 6. Oil pump; 7. Oil filter; 8. Oil filter seat; 9. Oil tank; 10. Oil sight glass; 11. Breathing cap. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] The utility model provides Figure 1-4A low-pressure screw vacuum pump with a built-in silencer is shown, comprising an outer shell 1, a screw pump main unit 3 is installed at a fixed position inside the outer shell 1, and the air outlet port of the screw pump main unit 3 is fixedly connected to an air outlet of a silencer main unit 4 through a bent pipe, the air outlet port of the screw pump main unit 3 is connected to the silencer main unit 4, and the exhausted gas is silenced through the inside of the silencer main unit 4, the silencer main unit 4 is located below the screw pump main unit 3, the air suction port 2 of the screw pump main unit 3 is set upward, the air suction port 2 passes through the top plate of the outer shell 1 and extends to the outside of the outer shell 1, an oil pump 6 is fixedly installed at the inner base position of the outer shell 1, and the oil pump 6 is fixedly connected to the oil tank 9 through an oil pipe 5, and the oil pipe 5 is fixedly connected to the oil inlet of the screw pump main unit 3.

[0023] The muffler body 4 includes an air inlet 41, a welded steel pipe 42, a carbon steel pipe 43, a muffler reducer plate 44, a stainless steel mesh plate 45, a short section flanging pipe 46 and an air outlet 47. The end of the air inlet 41 is integrally welded with one end of the carbon steel pipe 43 through the welded steel pipe 42 and the muffler reducer plate 44, and the end of the carbon steel pipe 43 away from the air inlet 41 is integrally welded with the air outlet 47 through the short section flanging pipe 46 and the muffler reducer plate 44, thereby ensuring the stability of the installation of the muffler body 4 and ensuring that the muffler body 4 absorbs noise to the maximum extent, thereby avoiding noise problems from causing harm to the staff and the machine body.

[0024] The air inlet 41 on one side of the muffler body 4 is fixedly connected to the air outlet port of the screw pump host 3 through a flange, and the air outlet 47 on one side of the muffler body 4 passes through a side wall of the outer shell 1 and extends to the outside of the outer shell 1, which facilitates the correct installation of the muffler body 4 and ensures the subsequent normal operation of the muffler body 4.

[0025] A stainless steel mesh plate 45 is provided on the inner side of the carbon steel pipe 43, and a glass wool interlayer is filled in the inner compartment of the carbon steel pipe 43. The glass wool interlayer can effectively block sound waves, create a quiet space environment, and ensure that the harm caused by noise is reduced when the muffler body 4 is in use.

[0026] An oil sight glass 10 is provided outside the oil tank 9 , and a breathable cap 11 is provided on the top of the oil tank 9 , so that the internal conditions of the oil tank can be observed through the oil sight glass 10 .

[0027] The pipe mouth of the oil pipe 5 is connected to the oil filter 7 through the oil filter seat 8, so as to filter the used oil and ensure the quality of the oil, thereby extending the service life of the device.

[0028] Working principle: When using a low-pressure screw vacuum pump with a built-in silencer, first, the screw pump main unit 3 drives the impeller to rotate at high speed through the coupling. Due to the effect of centrifugal force, the density of the gas will decrease and the pressure will increase. At this time, the air pressure in the sealed chamber is the atmospheric pressure value, so the air suction port 2 is automatically opened, and fresh air from the outside enters the cylinder and mixes with the original mixed gas, and then flows into the air storage tank and is discharged along the air outlet port of the screw pump main unit 3. The air outlet port position of the screw pump main unit 3 is connected with a silencer body 4, and the exhausted gas passes through the inside of the silencer body 4 and then is discharged from the air outlet 47, wherein the internal compartment of the carbon steel pipe 43 in the silencer body 4 is filled with a glass wool interlayer, which can effectively block sound waves, create a quiet space environment, and ensure that the silencer body 4 reduces the harm caused by noise when in use, ensuring that the device can provide clean, efficient and reliable air power during working hours, and at the same time has the characteristics of low noise, high efficiency, reliability, safety, environmental protection and economy, and is safer to use.

[0029] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-pressure screw vacuum pump with a built-in muffler, comprising a housing (1), characterized in that: A screw pump main unit (3) is installed at a fixed position inside the housing (1), and the air outlet port of the screw pump main unit (3) is fixedly connected to an air outlet of a muffler main unit (4) via a bent pipe. The muffler main unit (4) is located below the screw pump main unit (3). The air suction port (2) of the screw pump main unit (3) is arranged upward, and the air suction port (2) passes through the top plate of the housing (1) and extends to the outside of the housing (1). An oil pump (6) is fixedly installed at a base position inside the housing (1), and the oil pump (6) is fixedly connected to an oil tank (9) via an oil pipe (5), and the oil pipe (5) is fixedly connected to the oil inlet of the screw pump main unit (3).

2. A low-pressure screw vacuum pump with a built-in muffler according to claim 1, characterized in that: The silencer body (4) comprises an air inlet (41), a welded steel pipe (42), a carbon steel pipe (43), a silencer reducer plate (44), a stainless steel mesh plate (45), a short section flanged pipe (46) and an air outlet (47), and the end of the air inlet (41) is integrally welded with one end of the carbon steel pipe (43) through the welded steel pipe (42) and the silencer reducer plate (44), and the end of the carbon steel pipe (43) away from the air inlet (41) is integrally welded with the air outlet (47) through the short section flanged pipe (46) and the silencer reducer plate (44).

3. A low-pressure screw vacuum pump with a built-in muffler according to claim 2, characterized in that: The air inlet (41) on one side of the muffler body (4) is fixedly connected to the air outlet port of the screw pump main unit (3) via a flange, and the air outlet (47) on one side of the muffler body (4) passes through a side wall of the outer shell (1) and extends to the outside of the outer shell (1).

4. A low-pressure screw vacuum pump with a built-in muffler according to claim 2, characterized in that: A stainless steel mesh plate (45) is provided on the inner side of the carbon steel pipe (43), and a glass wool interlayer is filled in the inner compartment of the carbon steel pipe (43).

5. A low-pressure screw vacuum pump with a built-in muffler according to claim 1, characterized in that: An oil sight glass (10) is provided outside the oil tank (9), and a breathable cap (11) is provided on the top of the oil tank (9).

6. A low-pressure screw vacuum pump with a built-in muffler according to claim 1, characterized in that: The pipe opening of the oil pipe (5) is connected to the oil filter (7) via an oil filter seat (8).

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