阅读说明：本技术 一种用于电子真空双腔泵的泵环曲线及泵环 (Pump ring curve and pump ring for electronic vacuum double-cavity pump ) 是由 韩雪 杜军 张全慧 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种用于电子真空双腔泵的泵环曲线及泵环,所述泵环内最大半径为R,最小半径为r,可变半径为ρ,所述泵环曲线采用8次曲线优化设计：<Image he="112" wi="700" file="DDA0002564612150000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>其中n＝8,α、<Image he="54" wi="44" file="DDA0002564612150000012.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>为最小半径r与可变半径ρ之间的可变相位角。本发明得出的新型泵环曲线的径向速度、径向加速度、加速度变化率不仅在过渡段角度范围内是连续光滑的,且在曲线起点、终点处的速度、加速度及加速度变化率都为零,完全消除了振动冲击造成的噪声,是一种无冲击、低噪声的泵环曲线。(The invention discloses a pump ring curve and a pump ring for an electronic vacuum double-cavity pump, wherein the maximum radius in the pump ring is R, the minimum radius is R, the variable radius is rho, and the pump ring curve is optimally designed by adopting an 8-order curve: wherein n is 8, α, Is a variable phase angle between the minimum radius r and the variable radius ρ. The radial speed, radial acceleration and acceleration rate of the novel pump ring curve obtained by the invention are continuous and smooth in the angle range of the transition section, and the speed, acceleration and acceleration rate of the curve at the starting point and the ending point of the curve are changedThe chemical conversion rate is zero, the noise caused by vibration impact is completely eliminated, and the pump ring curve is free of impact and low in noise.)

1. A pump ring curve for an electronic vacuum dual chamber pump, wherein the maximum radius in the pump ring is R, the minimum radius is R, the variable radius is p, and the pump ring curve is optimally designed by adopting an 8-order curve:

the constraint conditions of the above formula (1) are as follows:

in that

when in useWhere ρ is r, ρ' is 0, ρⁿ＝0，ρ^m＝0；

When in use

when in useWhere ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

In that

when in useWhere ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

When in useTime, rhoⁿ＝-x(R-r)ω²/α²，ρ^m＝0；

When in useWhen ρ ═ R, ρ' ═ 0, ρⁿ＝0，ρ^m＝0；

The formula (1) is changed into

The optimal pump ring curve is obtained by the following steps:

when in useWhen the temperature of the water is higher than the set temperature,

when in useWhen the temperature of the water is higher than the set temperature,

2. a pump ring, characterized in that a pump ring curve according to independent claim 1 is used.

Technical Field

The invention relates to a pump ring, in particular to a pump ring curve pump ring for an electronic vacuum double-cavity pump.

Background

The shape of the inner curve of the pump ring determines the motion characteristics, mechanical properties and output performance of the vane, so the rationality of the inner curve of the pump ring determines the performance quality of the vane pump.

The noise control of the pump can not only improve the environmental pollution, but also is directly related to the service life and the performance of the pump, the noise of the vane pump comprises two parts of mechanical noise and airflow noise, the curve characteristic in the pump ring determines the running path and the stress of the vanes, and determines the change of the air intake volume and the air exhaust volume of the air, thereby playing a vital role in the mechanical noise and the airflow noise.

Disclosure of Invention

The present invention is directed to a pump ring curve and a pump ring for an electronic vacuum dual-chamber pump, which solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme:

a pump ring curve for an electronic vacuum dual-cavity pump, wherein the maximum radius in the pump ring is R, the minimum radius in the pump ring is R, the variable radius is rho, and the pump ring curve is optimally designed by adopting an 8-order curve:

wherein n is 8, α,A variable phase angle between the minimum radius r and the variable radius ρ;

the constraint conditions of the above formula (1) are as follows:

in thatInterval:

when in use

Where ρ is r, ρ is 0, ρⁿ＝0，ρ^m＝0；

When in use

Time, rhoⁿ＝x(R-r)ω²/α²，ρ^m＝0，ρ′＝0，ρⁿ＝0，ρ^m0; wherein x is an undetermined coefficient, and omega is the angular speed of the rotor;

when in useWhere ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

In thatInterval:

when in use

Where ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

When in useTime, rhoⁿ＝-x(R-r)ω²/α²，ρ^m＝0；

When in useWhen ρ ═ R, ρ' ═ 0, ρⁿ＝0，ρ^m＝0；

The formula (1) is changed into

The optimal pump ring curve is obtained by the following steps:

when in useWhen the temperature of the water is higher than the set temperature,

when in use

When the temperature of the water is higher than the set temperature,

further, the invention provides a pump ring adopting the pump ring curve.

Compared with the prior art, the invention has the beneficial effects that: the radial speed, radial acceleration and acceleration rate of the novel pump ring curve obtained by the invention are continuous and smooth in the angle range of the transition section, and the speed, acceleration and acceleration rate of the curve at the starting point and the ending point are all zero, so that the noise caused by vibration impact is completely eliminated, and the novel pump ring curve is a non-impact low-noise pump ring curve.

Drawings

FIG. 1 is a schematic diagram of various parameters in a pump loop curve according to the present invention.

Fig. 2 is a schematic structural view of the pump ring of the present invention.

Fig. 3 is a schematic structural view of the pump ring of the present invention applied to an electronic vacuum dual chamber pump.

In fig. 3: 1-pump ring, 2-rotor, 3-blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, in order to improve uneven friction and collision between a vane and an inner surface of a pump ring during operation of a pump, an octave curve transition method is adopted for a transition curve, so that a vibration excitation source during movement of the vane is completely eliminated, and noise and service life during operation of the pump are improved; the pump ring curve is internally provided with a large arc section and a small arc section, and the end of the large arc section is provided with a pre-compression curve so as to reduce the pressure change gradient in the blade working wall and reduce the airflow noise during pressure switching. The pre-compression curve adopts a constant-speed curve with a small lift angle, and the constant-speed curve is connected with the transition curve in a seamless mode at the joint of the constant-speed curve and the transition curve, so that the impact is reduced to the minimum.

Following the above principle, in order to reduce the noise of the electronic vacuum pump and improve the reliability, the inner curve of the pump ring should have good mechanical properties and no excitation effect, and simultaneously, the airflow pulsation should be as small as possible, and the high-order curve can meet the requirements of the rotor vane pump on the characteristics of the radial speed, the acceleration and the like of the curve of the pump ring, so that the high-order curve is adopted in the design of the pump ring of the product; if the maximum radius in the pump ring is R, the minimum radius is R, the variable radius is rho, and the pump ring curve is optimally designed by adopting 8-time curves:

wherein n is 8, α,

A variable phase angle between the minimum radius r and the variable radius ρ;

the constraint conditions of the above formula (1) are as follows:

in that

Interval:

when in use

Where ρ is r, ρ is 0, ρⁿ＝0，ρ^m＝0；

When in useTime, rhoⁿ＝x(R-r)ω²/α²，ρ^m＝0，ρ′＝0，ρⁿ＝0，ρ^m0; wherein x is an undetermined coefficient, and omega is the angular speed of the rotor;

when in useWhere ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

In thatInterval:

when in useWhere ρ is (R + R)/2, ρⁿ＝0，ρ^m＝0；

When in use

Time, rhoⁿ＝-x(R-r)ω²/α²，ρ^m＝0；

When in use

When ρ ═ R, ρ' ═ 0, ρⁿ＝0，ρ^m＝0；

The formula (1) is changed into

The optimal pump ring curve is obtained by the following steps:

when in use

When the temperature of the water is higher than the set temperature,

when in use

When the temperature of the water is higher than the set temperature,

further, the present invention provides a pump ring using the above-described pump ring curve, as shown in fig. 2.

When the pump ring is applied specifically, the structural relationship among the pump ring 1, the rotor 2 and the blades 3 is shown in fig. 3, the rotor 2 and the blades 3 are made of graphite, the pump ring can resist high temperature and has self-lubricating property, and the pump ring 1 is made of metal.

The electric vacuum pump drives the rotor 2 and the blades 3 to rotate through the brush motor, so that a gas cavity is formed with the pump ring 1 to change circularly, the working process of air suction and exhaust is further completed, mechanical noise and airflow noise can be generated in the process, and the pump ring curve is used for reducing the mechanical noise and the airflow noise.

In summary, according to the optimal eighth transition curve equation (1), the radial velocity, the radial acceleration, and the acceleration rate of the new pump ring curve are continuously smooth in the transition section angle range, and the velocity, the acceleration, and the acceleration rate of the new pump ring curve at the start point and the end point of the curve are all zero, so that the noise caused by vibration impact is completely eliminated, and the pump ring curve is non-impact and low-noise.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.