Rotary vane type vacuum pump eliminating harmful space
A technology of rotary vane vacuum pump and harmful space, which is applied in the direction of rotary piston pump, rotary piston/swing piston pump components, rotary piston machinery, etc., and can solve the problems such as the decline of the vacuum pumping effect of the vacuum pump and the inability to remove the gas. , to achieve the effect of improving the effect
Pending Publication Date: 2021-03-26
爱德华真空设备股份有限公司
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AI Technical Summary
Problems solved by technology
Generally speaking, the stator of the pump (the inner wall of the pump chamber) is inscribed at the apex of the rotor of the pump, and there is a small gap between the two, which is sealed by oil. One side of the apex is the intake pipe, and the other side is the exhaust pipe. After the rotary vane rotates through the exhaust pipe, a certain space is formed between the rotary vane, the exhaust pipe and the apex. This part of the space is called a harmful space, because the rotary vane has passed the exhaust pipe, and the gas in this part of the space cannot be eliminated. It can only be squeezed by the rotary vane, breaks through the oil seal under pressure, and enters the pump chamber space on the other side of the apex, resulting in a decrease in the vacuum pumping effect of the vacuum pump
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0030] Such as figure 2 and Figure 5 A protrusion 7 is set between the apex 1 and the mouth of the exhaust pipe 3, the protrusion 7 is a strip along the axial direction of the pump chamber, the protrusion 7 is equal to the rotor 4, and the protrusion 7 The outer edge of the cross section of 7 is a section of arc, the radius of the circle where the arc is located is equal to the section radius of the pump cavity, and the corresponding central angle of the arc is 25 degrees.
Embodiment 2
[0032] One continuous protrusion 7 in Embodiment 1 is changed into several discontinuous protrusions 7 on one axis, and other conditions remain unchanged.
Embodiment 3
[0034] Change the central angle in Example 1 to 20 degrees, and other conditions remain unchanged.
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Abstract
The invention discloses a rotary vane type vacuum pump eliminating harmful space and belongs to the field of vacuum pumps. In order to solve the problem that a harmful space exists in a rotary vane type vacuum pump, the rotary vane type vacuum pump eliminating the harmful space adopts the mode of arranging protrusions on the inner wall of a pump cavity at the harmful space to reduce the size of the harmful space from the source, or arranging a branch gas channel to exhaust residual gas in the harmful space, and therefore the problem is solved. The vacuumizing performance of the rotary vane type vacuum pump can be improved.
Description
technical field [0001] The invention relates to the field of vacuum pumps, in particular to a rotary vane vacuum pump for eliminating harmful spaces. Background technique [0002] The performance of a rotary vane vacuum pump depends on its ability to pump vacuum. Generally speaking, the stator of the pump (the inner wall of the pump chamber) is inscribed at the apex of the rotor of the pump, and there is a small gap between the two, which is sealed by oil. One side of the apex is the intake pipe, and the other side is the exhaust pipe. After the rotary vane rotates through the exhaust pipe, a certain space is formed between the rotary vane, the exhaust pipe and the apex. This part of the space is called a harmful space, because the rotary vane has passed the exhaust pipe, and the gas in this part of the space cannot be eliminated. It can only be squeezed by the rotating vane, breaks through the oil seal under pressure, and enters the pump chamber space on the other side of ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F04C25/02F04C18/344F04C29/00F04C29/12
CPCF04C18/3441F04C25/02F04C29/00F04C29/12
Inventor 陈昌金
Owner 爱德华真空设备股份有限公司
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