CN-121993655-A - Gas ballast valve with manual regulation function

CN121993655ACN 121993655 ACN121993655 ACN 121993655ACN-121993655-A

Abstract

The invention provides a gas ballast valve with a manual regulation function, which comprises a valve body, wherein the side surface of the valve body is provided with an air inlet, the gas ballast valve also comprises a regulating seat, the regulating seat is arranged at an end opening of the valve body in a threaded manner, the bottom of the regulating seat is positioned below the air inlet, a gap is formed between the outer side wall of the regulating seat and the inner peripheral surface of the valve body, the gap is communicated with the air inlet, gas introduced into the air inlet enters the pump cavity after passing through the gap, and the regulating seat is manually rotated to regulate the length of the gap. This gas ballast valve with manual regulation function controls the clearance and leads through adjusting clearance length to control gas ballast volume, regulation mode is simple reliable, and regulation stability is good, is difficult for the jamming, adjusts through the regulation seat of rotatory screw installation simultaneously, and adjustment distance is long, adjusts meticulously, and the conductance changes more regularly, can realize linear control.

Inventors

HE MINJIAN
ZHANG ZEWU
CHEN YONGFU
ZHOU JUNFEI
WU KAN

Assignees

浙江方远力鑫真空设备有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (5)

1. The utility model provides a gas ballast valve with manual regulation function, includes valve body (6), the side of valve body (6) is equipped with air inlet (61), its characterized in that still includes regulation seat (1), regulation seat (1) screw thread installation is in the end opening part of valve body (6), the bottom of regulation seat (1) is located the below of air inlet (61), the lateral wall of regulation seat (1) with form clearance (62) between valve body (6) inner peripheral surface, clearance (62) with air inlet (61) intercommunication, the gas that lets in air inlet (61) passes through behind clearance (62) gets into the pump chamber, manual rotation regulation seat (1) is adjusted the length of clearance (62).
2. The gas ballast valve with the manual adjusting function according to claim 1, wherein an inflation quantity scale (8) is arranged on the side face of the valve body (6), the top face of the adjusting seat (1) is close to the inflation quantity scale (8), and scales on the inflation quantity scale (8) are standard inflation quantities corresponding to different lengths of the gaps (62).
3. The gas ballast valve with the manual adjusting function according to claim 1, characterized in that an annular groove (63) is formed in the inner peripheral surface of the valve body (6), the annular groove (63) is correspondingly communicated with the air inlet (61), an annular channel is formed between the annular groove (63) and the outer wall of the adjusting seat (1), and the bottom of the annular channel is in transitional communication with the gap (62) through an inclined surface (64).
4. A ballast valve with manual regulation function according to claim 1, characterized in that the top of the regulating seat (1) is made with a hexagonal inner hole (103).
5. The gas ballast valve with the manual adjusting function according to claim 1, wherein a flange is arranged on the side surface of the top of the adjusting seat (1), a set screw (104) is arranged on the flange in a penetrating mode, the set screw (104) is rotated, the bottom of the set screw (104) is in contact with the top surface of the valve body (6), and the valve body (6) is locked.

Description

Gas ballast valve with manual regulation function Technical Field The invention belongs to the technical field of gas ballasting valves, and relates to a gas ballasting valve with a manual adjusting function. Background The density of the liquid generally exceeds that of the gas, and the adsorption force of the liquid on the surface of the object is larger, so that the liquid is more likely to remain on the surface of the pump cavity. For oil seal mechanical vacuum pumps with working fluid, such as slide valve vacuum pumps, rotary vane vacuum pumps, oil ring vacuum pumps and other vacuum pumps, the liquid can pollute the working fluid, so that saturated vapor pressure of the working fluid is increased, the sealing effect is reduced, and the pumping speed and the limiting vacuum of the oil seal vacuum pump are reduced. Therefore, when the mechanical vacuum pump pumps the condensable gas, the condensable gas needs to be prevented from liquefying in the pump cavity, and the main stream method is to fill a large amount of non-condensable gas through the gas ballast valve, so that the duty ratio of the condensable gas in the pump cavity is reduced, the condensable gas can not reach the liquefying pressure after being compressed in the pump cavity, and then the condensable gas is directly discharged in a gaseous state. The amount of ballasting is proportional to the mass flow of the condensable gas pumped by the vacuum pump, so that the lower the pump inlet pressure, the smaller the ballasting requirement, and the higher the pump inlet pressure, the greater the ballasting requirement, with the nature of the pumped gas unchanged. For a pure condensable gas, the ballasted charge is proportional to the pump inlet pressure. However, the inflation amount of the existing gas ballast valve is not adjustable, when the vacuum pump is operated, the air amount which can be pumped by the existing gas ballast valve each time is kept unchanged, and for vacuum pumps with different volumes, the air amount pumped by the vacuum pump is easy to be too small or too large, so that the reduction amplitude of the compression ratio of the vacuum pump is too small or too large, and the phenomenon that the vacuum pump is still easy to generate steam condensation or low in vacuumizing efficiency is caused. In addition, the current part of common gas ballast valve structure with adjustable gas quantity on the market is equivalent to a regulating valve and a check valve, and is characterized in that a high-pressure medium directly charges to a pump cavity (vacuum) to generate a gas ballast effect, but the gas pressure ratio between an external high-pressure medium and the pump cavity is very large, and is thousands or even tens of thousands times, the gas volume is expanded in equal proportion during charging, and the tiny change of the gas ballast charging quantity is amplified very much, so that the common gas ballast valve is difficult to accurately regulate the gas quantity. Disclosure of Invention The invention aims to solve the problems in the prior art and provide a gas ballast valve with a manual adjusting function. The invention aims at realizing the technical scheme that the gas ballast valve with the manual regulation function comprises a valve body, wherein the side surface of the valve body is provided with an air inlet, the gas ballast valve also comprises a regulating seat, the regulating seat is arranged at an end opening of the valve body in a threaded manner, the bottom of the regulating seat is positioned below the air inlet, a gap is formed between the outer side wall of the regulating seat and the inner peripheral surface of the valve body, the gap is communicated with the air inlet, gas introduced into the air inlet enters the pump cavity after passing through the gap, and the regulating seat is manually rotated to regulate the length of the gap. In the gas ballast valve with the manual adjusting function, an air charge scale is arranged on the side face of the valve body, the top face of the adjusting seat is close to the air charge scale, and scales on the air charge scale are different standard air charges corresponding to the gap lengths. In the gas ballast valve with the manual adjusting function, the inner peripheral surface of the valve body is provided with the annular groove, the annular groove is correspondingly communicated with the air inlet, an annular channel is formed between the annular groove and the outer wall of the adjusting seat, and the bottom of the annular channel is in transitional communication with the gap through an inclined plane. In the gas ballast valve with the manual adjusting function, the top of the adjusting seat is provided with a hexagonal inner hole. In the gas ballast valve with the manual adjusting function, the side face of the top of the adjusting seat is provided with the flange, the flange is provided with the fastening screw in a penetrating manner, and the fastening screw i