CN202756319U - Drain cap used for SQ200 type moisture ejector vacuum pump - Google Patents

Abstract

The utility model relates to a drain cap used for a SQ200 type moisture ejector vacuum pump. The technical scheme includes that the drain cap comprises a drain cap body, wherein the drain cap body is circular, a coaxial ejecting hole is arranged in the drain cap body, the ejecting hole is cylindrical, the diameter of the drain cap body is 270 millimeters and the diameter of the ejecting hole is 27 millimeters. The drain cap used for the SQ200 type moisture ejector vacuum pump is based on improvements of the prior art. According to an improved waterpower ejector vacuum pump, multiple holes are replaced by one hole, vacuum degree is high, namely an absolute pressure is 5 mmHg, the drain cap is not prone to be blocked, manufacture and processing are convenient, cost is low, and the cost of each equipment is lowered by one third.

Description

A kind of drain cap for SQ200 type water vapor injection vacuum pump

Technical field

The utility model relates to a kind of transformation for the drain cap in the SQ200 type water vapor injection vacuum pump.

Background technique

The water vapor injection vacuum pump is widely used in the industries such as chemical industry, leather, medicine, food, electronics.In the multiple types vacuum pump, have easy to operate, the maintenance user cost low, the equipment of a kind of uniqueness of successful.The water vapor injection vacuum pump is to utilize hydromechanical incompressible liquid and compressible gas principle to reach the effect of vacuum.Its critical piece drain cap is the critical component that determines the degree of vacuum height.Drain cap in the existing design mostly is to be provided with the spray-hole that some tapers and center line and center hole center line intersect at a point at circular drain cap.Take SQ200 type water vapor injection vacuum pump as example, the implication of Sq200 is: sq represents steam; 200 represent under the standard condition 200 liters of per minute Exhaust Gas, the intrinsic drain cap of SQ200 type water vapor injection vacuum pump is porous, drain cap take diameter as 270mm is example, as shown in Figure 1, design of spray-hole is as shown in table 1 on it, totally four kinds of spray-holes: namely go up (11) 5 of the tapered injection perforations of 8.5/ time φ 6.5 of φ, (14) 5 of 7.5/ time φ of upper φ, 5.5 tapered injection perforations, (13) 5 of 6.5/ time φ of upper φ, 4.5 tapered injection perforations, (12) 1 of φ 8.6 spray-holes.As seen the upper spray-hole quantity of drain cap (10) is many, the problem that exists is: make processing cost high, and in use, owing to having impurity in institute's extracting vacuum gas or the water, often cause a hole or porous to stop up or half blocked state, cause degree of vacuum obviously to descend, do not reach production requirement, force termination of pumping to stop production and repair, cause certain economic loss to enterprise.Therefore, the technical innovation of implementing drain cap is the key point that addresses the above problem.

The former drain cap pattern of table 1 and area computational chart

Summary of the invention

In order to address the above problem, the utility model improves for the drain cap that is used for SQ200 type water vapor injection vacuum pump, provides an a kind of hole to replace porous, can reach the drain cap that is used for SQ200 type water vapor injection vacuum pump of optimal vacuum pressure.

The technical solution adopted in the utility model is: a kind of drain cap for SQ200 type water vapor injection vacuum pump, comprise the drain cap main body, the drain cap main body is circular, be provided with a coaxial spray-hole in the drain cap main body, spray-hole is cylindrical, when the diameter of drain cap main body was 270mm, the diameter of spray-hole was 27mm.

As can be seen from Table 1, cone shape hole upper limit sectional area adds up to 728.25, is limited to 422.1 down.For a hole replaces porous, to reach the optimum state.Test in aperture for spray-hole, has found the aperture of best spray-hole.The results are shown in Table 2.

Table 2 single orifice plate laboratory data (the drain cap diameter is 270mm)

Sequence number	Aperture (mm)	Jie Mian Ji ㎜ ２	Produce absolute pressure mmHg
				1	φ23.0	415.26	96
2	φ24.0	452.16	83
				3	φ25.0	490.62	65
4	φ25.5	510.45	42
				5	φ26.0	530.66	27
6	φ26.5	551.27	15
				7	φ27.0	572.26	5
8	φ27.5	593.66	10
				9	φ28.0	615.44	20
10	φ28.5	637.62	45
				11	φ29.0	660.18	67
12	φ29.5	683.15	85
				13	φ30.0	706.50	92

As seen from Table 2, when the diameter of drain cap was 270mm, when the aperture of spray-hole was φ 27, the absolute pressure of generation was 5mmHg, is the optimum state.

The utility model effect is: the utility model improves for the drain cap of SQ200 type water vapor injection vacuum pump.Water-jet vacuum pump after the improvement replaces porous with a hole, has degree of vacuum high (absolute pressure is 5mmHg), and drain cap does not stop up, and makes easy to processly, and cost is low, than original every equipment cost reduction about 1/3rd.

Description of drawings

Fig. 1 is the drain cap structural representation that is used for SQ200 type water vapor injection vacuum pump in the prior art.

Fig. 2 is the drain cap structural representation that be used for SQ200 type water vapor injection vacuum pump of the utility model through transforming.

Embodiment

As shown in Figure 2, a kind of drain cap for SQ200 type water vapor injection vacuum pump, comprise drain cap main body (1), drain cap main body (1) is circular, be provided with a coaxial spray-hole (2) in drain cap main body (1), spray-hole (2) is cylindrical, and when the diameter of drain cap main body (1) was 270mm, the diameter of spray-hole (2) was 27mm.

Claims (1)

1. drain cap that is used for SQ200 type water vapor injection vacuum pump, comprise drain cap main body (1), drain cap main body (1) is circular, it is characterized in that: be provided with a coaxial spray-hole (2) in drain cap main body (1), spray-hole (2) is cylindrical, when the diameter of drain cap main body (1) was 270mm, the diameter of spray-hole (2) was 27mm.

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