CN202161731U

CN202161731U - Pressure regulating fire hydrant

Info

Publication number: CN202161731U
Application number: CN2011202508481U
Authority: CN
Inventors: 廖建华
Original assignee: JIANGXI RONGHE SPECIAL FIRE FIGHTING EQUIPMENT MANUFACTURING Co Ltd
Current assignee: JIANGXI RONGHE SPECIAL FIRE FIGHTING EQUIPMENT MANUFACTURING Co Ltd
Priority date: 2011-07-16
Filing date: 2011-07-16
Publication date: 2012-03-14
Anticipated expiration: 2021-07-16

Abstract

The utility model relates to a fire hydrant, in particular to a pressure regulating fire hydrant which can effectively prevent blocking, has a simple structure and can regulate the pressure of a water flow. The pressure regulating fire hydrant comprises a hydrant body, wherein a valve rod passes through the hydrant body; the lower section of the valve rod is sequentially sleeved with an upper positioning block, a decompression piston, a decompression valve seat, a fixed nut, a spring and a lower positioning block from the top down; through water holes are arranged on the upper positioning block and the lower positioning block and are fixedly connected with the hydrant body in the axial direction; a shoulder edge is arranged on the valve rod at the position slightly lower than the upper positioning block; the decompression piston and the decompression valve seat is limited between the shoulder edge and the fixed nut; the spring is limited between the fixed nut and the lower positioning block; 2-8 hollow through decompression holes are arranged on the decompression piston in the axial direction; a main valve sealing ring is embedded at the corner of the outer ring of the decompression piston; the outer side of the main valve sealing ring is in close contact with the inner side wall of a base; and a decompression valve seat sealing ring is arranged on the decompression valve seat.

Description

A kind of voltage-regulation type fire hydrant

Technical field

The utility model relates to a kind of fire hydrant, relate in particular to a kind ofly can effectively prevent to stop up, the voltage-regulation type fire hydrant of scalable water flow pressure simple in structure.

Background technology

A patented product on the market at present: put and hit a kind of crashproof pressure regulation fire hydrant of pressure regulation fire hydrant (CN 2632161Y); Comprise a body; Run through a valve rod in the body; The valve rod hypomere wears locating piece on, a cydariform piston, a base, a hold-down nut, a spring and locating piece once from top to bottom successively, and last locating piece is provided with the water flow hole that runs through with following locating piece and radially is being connected with body-fixed; Valve rod a little less than on the locating piece place be provided with the shoulder stupefied; Piston, base are limited to be takeed between stupefied and the hold-down nut, and spring is limited between hold-down nut and the following locating piece; Accompany a sealing gasket between the bottom of piston and base, the top end face of piston is provided with the apopore that runs through, and the side positon of near bottom of piston is provided with the inlet opening; Piston periphery suit one holder, the seal receptacle idol that is embedded with on the holder on sealing ring and the body is joined, and the top of piston is radially expanded and is formed the convex edge, though above-mentioned patent can realize regulating the basic function of water flow pressure, has following defective:

1, cydariform piston and holder are under the situation of startup and closed condition inlet opening; The action of sliding relatively in the side; Because have certain clearance between reason piston that slides relatively and the holder; Smaller impurity gets into the gap easily, thereby causes the relative slip between piston and the holder to be obstructed easily, and serious situation possibly cause both to engage that firmly to cause one-level to be opened invalid;

2, piston periphery suit one holder and since holder set up and piston be not one, holder is that the edge is stressed in the process that piston stress moves down, thereby causes unbalance stress in the holder folding process, can cause the potential safety hazard that misplaces or block;

3, perforate radial and axial time the in the piston; And radial and axial hole will be converged at internal piston, to the technological requirement of forging than higher, can not one-shot forming; And it is very high to the material requirements of piston; Not so perforate is easy to cause the cracking of piston only in the time of radial and axial, and common ironcasting just is difficult to accomplish, so processing cost is very high.

The utility model content

In order to overcome above-mentioned defective, the purpose of the utility model is to provide that a kind of processing technology is simple, anti-clogging, voltage-regulation type fire hydrant safe and reliable to operation.

To achieve these goals; The utility model adopts following technical scheme: a kind of voltage-regulation type fire hydrant; Comprise a key; Run through a valve rod in the key, the valve rod hypomere wears locating piece on, a decompression piston, a Pressure relief valve seat, a hold-down nut, a spring and locating piece once from top to bottom successively, and last locating piece is provided with the water flow hole that runs through with following locating piece and radially is being fixedly connected with key; Valve rod a little less than on the locating piece place be provided with the shoulder stupefied; Decompression piston, Pressure relief valve seat are limited to be takeed between stupefied and the hold-down nut; Spring is limited between hold-down nut and the following locating piece; Said decompression piston is shaped as the cylinder of a upper end area of section less than the lower end area of section; The axial direction of decompression piston has the through-type vent of 2 ~ 8 hollows, and the outer ring corner of decompression piston is embedded with the main valve sealing ring, and the outside of said main valve sealing ring contacts with the sealing of the madial wall of base; Pressure relief valve seat is provided with the Pressure relief valve seat sealing ring.The quantity of said Pressure relief valve seat sealing ring is identical with the quantity of through-type vent.

Operation principle: this fire hydrant is to be operated by the mode of screw mandrel transmission, because screw mandrel pitch is less, and the opening and closing of fire hydrant ability easy manipulation control stick; Sealing means is a positive pressure means of press seals downstream, in the bottom spring is set, and after receiving external force collision, the strength by the bilayer of inner pipe water pressure and spring upwards pushes away can seal press water fire hydrant automatically; Fire hydrant can opening ways be that classification is opened, and for the rill water gaging gets into key top, is that big flow fire water gets into key top when opening the second level when opening the first order.

Concrete flow process is following: the fire hydrant spanner is buckled on the action bars; Rotate to opening direction; Valve rod becomes the piston motion with decompression piston, on decompression piston, be drilled with straight-through vent, the Pressure relief valve seat that establish the bottom of valve rod and decompression piston; Its effect is several straight-through vents of lower seal decompression piston in off position; Valve rod a little less than on to be provided with shoulder stupefied at the locating piece place, this stupefied holding section of shoulder is a lower valve rod and the terminal point of decompression piston piston motion, it designs by the mistake water yield that leads directly to vent apart from design; So when valve rod moves to the terminal point of piston motion downward vertically, (take on stupefied and the decompression piston applying); Pressure relief valve seat separates with decompression piston, and this moment, press water entered to key through the straight-through vent of decompression piston, continued to do breakdown action; Take on stupefied to the downward active force of decompression piston effect; Sealing ring on the decompression piston will separate with the inner seal receptacle of base, and this moment, press water will get in the key, until reaching maximum position through the periphery and the straight-through vent of decompression piston.Reverse operating fire hydrant wrench when closing; Inner valve rod is motion vertically upward then; Upwards impact owing to reached maximum position and hydraulic pressure, the lower valve rod decompression piston that moves upward also moves upward when closing, and the seal receptacle applying in decompression piston and base seals; Straight-through vent then continues discharge pressure water to key, and it is tight until closing to continue operation.

The utility model compared with prior art has following technological merit:

The decompression piston body can adopt the lower ironcasting of cost to process in the utility model, on foundry goods, is provided with 2 ~ 8 through-type vents, and processing is simple, its objective is that decompression is opened in order to strengthen this part in row's property certainly of practical application, response fast;

1, in the process of practical application; Because this fire hydrant is to be used in petrochemical enterprise basically; Used fire_fighting pipe network all is the stable high-pressure pipe network, and the pipe in fire water can't guarantee no-sundries, sandstone, so for let the pipe in foreign material and sandstone stay seals at as far as possible; Documents: put slide relative of the cydariform piston that hits in the pressure regulation fire hydrant (CN 2632161Y) and have the gap with holder; So the utility model only adopts decompression piston, foreign material and sandstone can't be got in the piston, thereby guaranteed the normal operation of device.

2, decompression piston has only axial perforate in the utility model; Make simple; Can a compression moulding; Reduced documents: put hit in the pressure regulation fire hydrant (CN 2632161Y) the axis of the piston to processing step of perforate all radially, and can the lower iron castings one-shot forming of use cost, thus reduced cost of manufacture.

3, in the utility model with respect to documents: put and hit pressure regulation fire hydrant (CN 2632161Y); Reduced " chuck " these parts, and can reach better technique effect, decompression piston is the integrated design in this device; Firm and durable is stressed more balanced more.

4, respond fast: decompression piston is in the process of opening, as long as start control stick, the sealing ring of Pressure relief valve seat begins to separate with decompression piston, and this moment, press water just got into key inside through vent, had improved the speed of water outlet, also directly improves the fire extinguishing effect; Decompression is opened: decompression piston, Pressure relief valve seat and base sealing are opened for classification in the process of unlatching, at first are that Pressure relief valve seat separates with decompression piston, through straight-through vent water inlet; Interior pressure and the ductwork pressure of key this moment is that very big pressure differential is arranged, and one-level is opened, and also is that decompression is opened; Continue to open, decompression piston separates with the base seal receptacle again, and this opens for secondary; Be complete opening this moment, and fire hydrant is normally opened completion.

Description of drawings

Fig. 1 is the overall structure sketch map of the utility model.

Fig. 2 is the utility model sealing state sketch map.

Fig. 3 is the utility model opening one sketch map.

Fig. 4 is the utility model complete opening view.

Fig. 5 is the sectional view of the utility model decompression piston.

Fig. 6 is the vertical view of the utility model decompression piston.

The specific embodiment

Detail below in conjunction with Fig. 1 ~ 6 pair the utility model: a kind of voltage-regulation type fire hydrant; Comprise a key 1; Run through a valve rod 2 in the key; Valve rod 2 hypomeres wear on one locating piece 3, a decompression piston 4, a Pressure relief valve seat 5, a hold-down nut 6, a spring 7 and locating piece 8 once from top to bottom successively, and last locating piece 3 is provided with the water flow hole that runs through and radially is being fixedly connected with key 1 with 8 of location down; Valve rod 2 a little less than on locating piece 3 places be provided with the shoulder stupefied 9; Decompression piston 4, Pressure relief valve seat 5 are limited between shoulder stupefied 9 and the hold-down nut 6; Spring 7 is limited between hold-down nut 6 and the following locating piece 8; Said decompression piston 4 is shaped as the cylinder of a upper end area of section less than the lower end area of section; The axial direction of decompression piston 4 has the through-type vent of 2 ~ 8 hollows, and the outer ring corner of decompression piston 4 is embedded with main valve sealing ring 10, and the outside of said main valve sealing ring 10 contacts with the madial wall sealing of base 11; Pressure relief valve seat 5 is provided with Pressure relief valve seat sealing ring 12.

The quantity of said Pressure relief valve seat sealing ring 12 is identical with the quantity of through-type vent.

Claims

1. voltage-regulation type fire hydrant; Comprise a key; Run through a valve rod in the key; The valve rod hypomere wears locating piece on, a decompression piston, a Pressure relief valve seat, a hold-down nut, a spring and locating piece once from top to bottom successively, and last locating piece is provided with the water flow hole that runs through with following locating piece and radially is being fixedly connected with key; Valve rod a little less than on the locating piece place be provided with the shoulder stupefied; Decompression piston, Pressure relief valve seat are limited to be takeed between stupefied and the hold-down nut; Spring is limited between hold-down nut and the following locating piece; It is characterized in that: said decompression piston (4) is shaped as the cylinder of a upper end area of section less than the lower end area of section; The axial direction of decompression piston (4) has the through-type vent of 2 ~ 8 hollows; The outer ring corner of decompression piston (4) is embedded with main valve sealing ring (10), and the outside of said main valve sealing ring (10) contacts with the madial wall sealing of base (11); Pressure relief valve seat (5) is provided with Pressure relief valve seat sealing ring (12).

2. voltage-regulation type fire hydrant according to claim 1 is characterized in that: the quantity of said Pressure relief valve seat sealing ring (12) is identical with the quantity of through-type vent.