Working principle of EDCO USA vacuum generator
真空发生器就是利用正压气源产生负压的一种清洁，经济，新型，高效，小型的真空元器件，这使得在有压缩空气的地方，或在一个气动系统中同时需要正负压的地方获得负压变得十分容易和方便。 The United States EDCO USA vacuum generator is a clean, economical, new, efficient, and small vacuum component that uses a positive pressure air source to generate negative pressure. This makes it necessary to use positive pressure in a place with compressed air or in a pneumatic system. Where negative pressure is obtained, it becomes very easy and convenient. Vacuum generators are widely used in the fields of machinery, electronics, packaging, printing, plastics and robotics in industrial automation. The traditional use of the vacuum generator is to use suction cups to adsorb and transport various materials. It is especially suitable for adsorbing fragile, soft, thin non-ferrous, non-metallic materials or spherical objects. In this type of application, a common feature is that the required air extraction volume is small, the degree of vacuum is not high and it is intermittent work.
First, the working principle of the EDCO USA vacuum generator
The working principle of the vacuum generator is to use a nozzle to spray compressed air at a high speed, forming a jet at the nozzle outlet to generate a entrainment flow. Under the effect of entrainment, the air around the nozzle outlet is continuously sucked away to make the adsorption cavity The internal pressure drops below atmospheric pressure, forming a certain degree of vacuum.
It can be known from fluid mechanics that the continuity equation for incompressible air gas (gas enters at low speed and can be considered approximately as incompressible air)
A1v1 = A2v2
Where A1, A2 ---- the cross-sectional area of the pipeline, m2
气流流速,m/s v1, v2 ---- Airflow velocity, m / s
It can be known from the above formula that the larger the cross section, the smaller the flow velocity; the smaller the cross section, the larger the flow velocity.
For horizontal pipelines, the Bernoulli ideal energy equation for incompressible air is
P1 + 1 / 2ρv12 = P2 + 1 / 2ρv22
Where P1, P2-the corresponding pressures at sections A1, A2, Pa
截面A1,A2处相应的流速,m/s v1, v2 ---- the corresponding flow velocity at section A1, A2 , m / s
空气的密度,kg/m3 ρ ---- density of air, kg / m3
It can be known from the above formula that the flow rate increases and the pressure decreases. When v2 >> v1, P1 >> P2. When v2 increases to a certain value, P2 will be less than one atmospheric pressure, that is, negative pressure is generated. Therefore, it can be obtained by increasing the flow rate Negative pressure creates suction.
The author believes that the analysis and research of the suction mechanism of the vacuum generator and the factors affecting its working performance have practical significance for the design and selection of positive and negative pressure gas paths.
Second, the characteristics of the United States EDCO USA vacuum generator
、附带机械式真空开关的类型。 1. Type with mechanical vacuum switch.
、SMC真空发生器简单构造，使用寿命长。 2. SMC vacuum generator has simple structure and long service life.
、有耐化学药品、耐瓦斯用材质，可在各种环境使用。 3. Chemical resistant and gas resistant materials can be used in various environments. The SMC vacuum generator strictly refers to Japanese standards. The vacuum degree produced by the SMC vacuum generator can reach more than 90Kpa, which can be customized for mass production according to customer requirements.
Performance parameters of EDCO USA vacuum generator
、 吸入口处压力:记为Pv.当吸入口被完全封闭(如吸盘吸着工件),即吸入流量为零时,吸入口内的压力*低,记作Pvmin. 1.Pressure at the suction port: recorded as Pv. When the suction port is completely closed (such as the suction cup sucks the workpiece), that is, when the suction flow rate is zero, the pressure in the suction port is * low, and recorded as Pvmin.
、 空气消耗量:指从喷管流出的流量qv1. 2.Air consumption: refers to the flow qv1 from the nozzle.
、 吸着响应时间:吸着响应时间是表明真空发生器工作性能的一个重要参数,它是指从换向阀打开到系统回路中达到一个必要的真空度的时间. 3.Sorption response time: Sorption response time is an important parameter indicating the working performance of the vacuum generator.It refers to the time from the opening of the directional valve to the necessary vacuum in the system circuit.
、 吸入流量:指从吸口吸入的空气流量qv2.当吸入口向大气敞开时,其吸入流量*大,称为*大吸入流量qv2max. 4 , suction flow: refers to the air flow qv2 sucked from the suction port. When the suction port is open to the atmosphere, its suction flow is the largest, called the maximum suction flow qv2max.
美国EDCO USA真空发生器的性能影响 因素 Factors affecting the performance of the EDCO USA vacuum generator
真空发生器的性能与喷管的*小直径,收缩和扩散管的形状,通径及其相应位置和气源压力大小等诸多因素有关. The performance of the EDCO USA vacuum generator is related to many factors such as the minimum diameter of the nozzle, the shape of the shrinkage and diffusion tube, the diameter and its corresponding position, and the pressure of the gas source.
、 *大吸入流量qv2max的特性分析:较为理想的真空发生器的qv2max特性,要求在常用供给压力范围,qv2max处于*大值,且随着P01的变化平缓. 1.Characteristic analysis of the maximum suction flow qv2max: The ideal qv2max characteristic of the vacuum generator requires that in the commonly used supply pressure range, qv2max is at the maximum value, and changes gently with P01.
、 真空发生器在满足使用要求的前提下应减小其耗气量(L/min),耗气量与压缩空气的供给压力有关,压力越大,则真空发生器的耗气量越大.因此在确定吸入口处压务值勤的大小时要注意系统的供给压力与耗气量的关系,一般真空发生器所产生的吸入口处压力在20kPa到10kPa之间.此时供表压力再增加,吸入口处压力也不会再降低了,而耗气量却增加了.因此降低吸入口处压力应从控制流速方面考虑. 2.The vacuum generator should reduce its air consumption (L / min) on the premise that it meets the requirements of use. The air consumption is related to the pressure of compressed air supply. The greater the pressure, the greater the air consumption of the vacuum generator. When determining the size of the pressure duty at the suction port, pay attention to the relationship between the supply pressure of the system and the air consumption. Generally, the pressure at the suction port generated by the vacuum generator is between 20kPa and 10kPa. At this time, the pressure of the supply gauge increases, and the suction port At the same time, the pressure at the suction port will not decrease, but the air consumption will increase. Therefore, reducing the pressure at the suction port should be considered in terms of controlling the flow rate.
、 吸入口处压力Pv的特性分析:较为理想的真空发生器的Pv特性,要求在常用供给压力范围内(P01=0.4---0.5MPa),Pv处于*小值,且随着Pv1的变化平缓. 3.Characteristic analysis of the pressure Pv at the suction port: The ideal Pv characteristic of the vacuum generator is required to be within the common supply pressure range (P01 = 0.4 --- 0.5MPa), and Pv is at the minimum value, and with the Pv1 Change is gentle.
、 有时由于工件的形状或材料的影响,很难获得较低的吸入口处压力,由于从吸盘边缘或通过工件吸入空气,而造成吸入口处压力升高.在这种情况下,就需要正确选择真空发生器的尺寸,使其能够补偿泄漏造成的吸入口处压力升高.由于很难知道泄漏时的有效截面积,可以通过一个简单的试验来确定泄漏量.试验回路由工件,真空发生器,吸盘和真空表组成,由真空表的显示读数,再查真空发生器的性能曲线,可知道泄漏量的大小. 4.Sometimes it is difficult to obtain a low pressure at the suction port due to the shape or material of the workpiece, and the pressure at the suction port is increased due to the suction of air from the edge of the suction cup or through the workpiece. In this case, it is necessary to Correctly select the size of the vacuum generator so that it can compensate for the pressure rise at the suction port caused by leakage. Since it is difficult to know the effective cross-sectional area at the time of leakage, the amount of leakage can be determined by a simple test. The test circuit consists of the workpiece and the vacuum The generator, suction cup and vacuum gauge are composed of the display reading of the vacuum gauge, and then check the performance curve of the vacuum generator to know the amount of leakage.
、 在吸入口吵完全封闭的条件下,对特定条件下吸入口处压力Pv与吸入流量之间的关系如图3所示.为获得较为理想的吸入口处压务与吸入流量的匹配关系,可设计成多级真空发生器串联组合在一起. 5. Under the condition that the suction port is completely closed, the relationship between the pressure Pv at the suction port and the suction flow under certain conditions is shown in Figure 3. In order to obtain a more ideal relationship between the pressure at the suction port and the suction flow, Can be designed as a multi-stage vacuum generator combined in series.
、 吸着响应时间与吸附腔的容积有关(包括扩散腔,吸附管道及吸盘或密闭舱容积等),吸附表面的泄漏量与所需吸入口处压力的大小有关.对一定吸入口处压力要求来说,若吸附腔的容积越小,响应时间越短;若吸入口处压力越高,吸附容积越小,表面泄漏量越小,则吸着响应时间亦越短;若吸附容积大,且吸着速度要快,则真空发生器的喷嘴直径应越大. 6.The adsorption response time is related to the volume of the adsorption chamber (including the volume of the diffusion chamber, the adsorption pipe and the suction cup or the closed chamber, etc.), and the leakage of the adsorption surface is related to the required pressure at the suction port. Pressure requirements for a certain suction port For example, if the volume of the adsorption chamber is smaller, the response time is shorter; if the pressure at the suction port is higher, the adsorption volume is smaller and the surface leakage is smaller, the adsorption response time is shorter; if the adsorption volume is large and the adsorption For faster speeds, the nozzle diameter of the vacuum generator should be larger.
、 扩散管的长度应保证喷管出口的各种波系充分发展,使扩散管道出口截面上能获得近似的均匀流动.但管道过长,管壁摩擦损失增大.一般管长为管径的6---10倍较为合理.为了减少能量损失,可在扩散管直管道的出口加一个扩张角为6°---8°的扩张段. 7.The length of the diffusion tube should ensure that the various wave systems at the nozzle outlet are fully developed, so that an approximately uniform flow can be obtained on the outlet section of the diffusion tube. However, the tube is too long, and the wall wall friction loss increases. Generally, the tube length is the diameter of the tube. 6--10 times is more reasonable. In order to reduce energy loss, an expansion section with an expansion angle of 6 ° --- 8 ° can be added to the outlet of the diffuser straight pipe.
美国EDCO USA真空发生器的分类 Fifth, the classification of the EDCO USA vacuum generator
According to the nozzle Mach number M1 (the ratio of the outlet velocity to the local sound velocity), the vacuum generator can be divided into subsonic nozzle type (M1 <1), sonic nozzle type (M1 = 1) and supersonic nozzle type ( M1> 1). The subsonic nozzle and the sonic nozzle are both shrink nozzles, while the supersonic nozzle type must be a contraction first and then an expansion nozzle (that is, a Laval nozzle). In order to obtain the maximum suction flow rate or the highest suction port At the pressure, the vacuum generator is designed as a supersonic nozzle type.
Shenzhen Suosheng Technology
Co., Ltd. is the agent of EDCO USA vacuum generator, EDCO USA vacuum generator, EDCO USA vacuum chuck, EDCO USA powder conveyor, EDCO USA flow amplifier, EDCO USA vacuum pressure switch, EDCO USA vacuum filter, EDCO USA vacuum suction cup fixed joint, EDCO USA vacuum check valve, EDCO USA vacuum release valve, EDCO USA flow sensing throttle valve, etc.
Some models are: AXL1N, AXM2N, AX312-BKT-180, C6M10N, C5L20N, C6E28V, ML50N, ML100N, ML75N, E50N, MLSS150VH, ER05-T18F-ST, DER18-10LX1-PS-NR-VA3, VG18-10L, VG18-10L, VG18-05, VG38-10L, RS18-10L-PP-SX-B50N, J12HG-NR-ST, J25HG-NR, EV05HS-AA, EV10HS-ST, EV15HS, EV20HS-AA, LPB10L-38F, VLCP38F-A, VLP10-38F-A, VLP10LESC, etc.
The price is advantageous, the stock is available, the original is guaranteed, the fake one is compensated ten, welcome to consult and order, contact phone: 0755-86201880 website: cqlbwz.cn!