CN2549289Y

CN2549289Y - Snift valve

Info

Publication number: CN2549289Y
Application number: CN 02221128
Authority: CN
Inventors: 刘洪庆; 杨程华; 房坤
Original assignee: Tonghua Special Vehicle Co ltd
Current assignee: Tonghua Special Vehicle Co ltd
Priority date: 2002-06-07
Filing date: 2002-06-07
Publication date: 2003-05-07
Anticipated expiration: 2012-06-07

Abstract

The utility model relates to the structure of an exhalation valve of a liquid food transport vehicle, which belongs to the technical field of a safety valve for special vehicle. The utility model is mainly composed of a valve body, an end cap, a cylinder rod, springs and a keep plate, wherein an air inlet passage provided with an air inlet is arranged on the end cap, and the end cap is screwed on the upper part of the valve body; the keep plate is arranged on the inner wall of the large end of the valve body in a radial direction, a through hole in which the cylinder rod is movably sheathed is arranged on the keep plate in an axial direction, the springs of which the lower ends are supported above the keep plate are sheathed on the external side of the cylinder rod, and the upper parts of the springs support an axial sealing plate; holes are formed on the cylinder rod, and pins matched with the holes are arranged on the lower part of the keep plate. When pressure in a tank body is lower than external pressure and reaches a certain value, the springs are compressed, and the air inlet is opened; when pressure difference is reduced, the springs are restored to seal the air inlet, and the end cap is provided with connection screw threads so as to form dismountable connection with the valve body; besides, the keep plate performs a sprayproof function.

Description

Aspirating valves

Affiliated field

The utility model relates to the structure of food liquid transport vehicle Aspirating valves, belongs to special car safety valve technical field.

Background technique

The following two kinds of forms of the many employings of the employed safety valve of existing food liquid transport vehicle: a kind of is with the employed inhalation valve of common normal pressure tank truck, though the inside and outside pressure reduction of this kind valve can regulate tank car because its inlet, outlet are young, is difficult for taking apart cleaning.Be used on the food liquid transport vehicle; regular meeting is because easy cleaning not; cause the pot liquid sanitary index defective; even more serious is; advancing in valve; after air outlet hole is stopped up by adipopexia (dirt); cause this valve to lose in the regulating tank; the function of outer pressure reduction; thereby cause the accident; another kind of valve commonly used is to adorn a dust cover on a steam outlet pipe, and the food liquid in its jar communicates with the air of outside, and unique advantage of this valve is exactly an easy cleaning; can not block; but its shortcoming is also clearly, the one, on the tank car; easily leak during descending, the 2nd, the food in jar easily pollutes.

Technological scheme

The purpose of this utility model is that a kind of being convenient to of design loaded and unloaded, adjusted the inside and outside pressure difference of tank body automatically, and liquid that can not overflows in the breathing process, the Aspirating valves that can not block in the use.

The utility model comprises by valve body, end cap, piston rod, spring, pressing plate and forming that end cap is provided with gas-entered passageway, and gas-entered passageway is provided with suction port in end cap, and end cap is threaded in the valve body upper end; The valve interior wall upper end is big, the lower end is little, inwall radial arrangement pressing plate at the big end of valve body, pressing plate is established through hole vertically, the piston rod kink is in through hole, spring overcoat is in piston rod, the spring lower end is supported on the pressing plate top, and the radial seal plate is supported in the spring top, and the sealing utmost point cooperates with the air inlet port size of end cap; Have the hole on piston rod, the pin that cooperates with the hole is arranged in the below of pressing plate, and its length is greater than through-hole diameter.

By the support of spring, the sealing plate of piston rod and its upper end seals with the inlet hole on the end cap.When the pressure in the tank body was lower than external pressure and reaches certain value, spring was compressed, and suction port is opened; After pressure reduction reduces, spring resets again, with the suction port sealing, end cap is provided with connecting thread, so that removably connect with valve body formation, after end cap is pulled down, parts all in the valve body is all exposed fully outside, does not have the dead angle, and can pull down cleaning easily, in addition, pressing plate also plays the effect of splashproof.

The entrance point of gas-entered passageway of the present utility model is arranged on going to the bottom of end cap, can effectively prevent dust, foreign matter inlet passage.

Also be provided with vent on the pressing plate, to enlarge ventilation cross section, the inside and outside pressure reduction of rapid adjustment.

For strengthening the splashproof effect, at piston-rod lower end splash-back is set again, offer through hole on the splash-back, when assembling, the vent position of this lead to the hole site and pressing plate is interlaced.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the A--A sectional view.

Among the figure, 1 end cap, 2 sealing gaskets, 3 springs, 4 pressing plates, 5 latches, 6 piston rods, 7 valve bodies, 8 splash-backs, 9 sealing plates, 10 pilot holes, 11 suction ports, 12 gas-entered passageways, 13 pins, 14 vents, 15 through holes.

Specific embodiment

Be provided with axial step cutting pattern in the circular end cap 1, in this step, be provided with screw thread, the end, be provided with pilot hole 10 vertically in end cap 1, also is provided with gas-entered passageway 12, ring-type suction port 11 in the end cap 1, and the outer end of gas-entered passageway 12 is that the suction port end is arranged on going to the bottom of end cap 1.

Valve body 7 is a tubulose, the internal diameter on top is greater than the bottom internal diameter, valve body 7 tops are provided with the outside thread that cooperates with end cap 1, diameter less than the piston rod 6 of pilot hole 10 on overcoat splash-back 8 successively, pressing plate 4, spring 3, sealing plate 9, sealing gasket 2, offer two through holes on the piston rod 6, splash-back 8 is fixed by the step of pin 13 and piston rod 6, the diameter of splash-back 8 is less than the internal diameter of valve body 7 bottoms, pressing plate 4 diameters are greater than the internal diameter on valve body 7 tops, the pin 5 that cooperates by the through hole with piston rod 6 supports, sealing plate 9 external diameters are greater than the diameter of ring-type suction port 11, and cyclic sealing gasket 2 is fixed on the upper surface of sealing plate 9.

Also uniform four vents 14 on the above-mentioned pressing plate 4, uniform four through holes 15 on the splash-back 8 when mounted, interlace vent 14 and through hole 15, as shown in Figure 2.

Claims

1, Aspirating valves is characterized in that mainly being made up of valve body, end cap, piston rod, spring, pressing plate, and end cap is provided with gas-entered passageway, and gas-entered passageway is provided with suction port in end cap, and end cap is threaded in the valve body upper end; The valve interior wall upper end is big, the lower end is little, inwall radial arrangement pressing plate at the big end of valve body, pressing plate is established through hole vertically, the piston rod kink is in through hole, spring overcoat is in piston rod, the spring lower end is supported on the pressing plate top, and the radial seal plate is supported in the spring top, and sealing plate cooperates with the air inlet port size of end cap; Have the hole on piston rod, the pin that cooperates with the hole is arranged in the below of pressing plate, and its length is greater than through-hole diameter.

2,, it is characterized in that the entrance point of gas-entered passageway is arranged on going to the bottom of end cap according to the described Aspirating valves of claim 1.

3, according to the described Aspirating valves of claim 1, it is characterized in that pressing plate above offer vent.

4, according to the described Aspirating valves of claim 1, it is characterized in that being provided with splash-back, offer through hole on the splash-back at piston-rod lower end.

5,, it is characterized in that sealing plate upper end and be provided with sealing gasket according to the described Aspirating valves of claim 1.

6, according to claim 1 or 2 or 3 or 4 or 5 described Aspirating valvess, it is characterized in that the end is provided with the pilot hole that cooperates with piston rod in end cap.