CN2233494Y

CN2233494Y - Liquid flow constant pressure system

Info

Publication number: CN2233494Y
Application number: CN 94247440
Authority: CN
Inventors: 陈佩华
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-16
Filing date: 1994-12-16
Publication date: 1996-08-21
Anticipated expiration: 2004-12-16

Abstract

The utility model relates to an automatic constant device for liquid pressure, belonging to an automatic constant machinery device for liquid pressure. The utility model uses a movable diaphragm plate which is arranged between two end covers made of rigid plastic, and both sides of the diaphragm plate are provided with two springs having different sizes and strength; a valve gate is controlled through the two springs; an input fluctuant pressure value is automatically controlled and regulated, and the fluctuant liquid flow pressure is constantly kept at a preset value, and accordingly, the pressure constant purpose is achieved. The utility model is used for a continuously detecting device for water quality, and overcomes the uneconomical disadvantages that when a constant pressure water tank is used in old days, the volume is large, large quantity of water sample can overflow in operation, etc.

Description

The constant device of flow stream pressure

The utility model relates to a kind of device that is used for liquid course of conveying automatic constant pressure, belongs to the hydraulic machinery equipment of automatic control.Can be applicable in the instrument and instrument that water quality automatically analyzes, also can be applicable to soup in the water treatment procedure and add etc. in the automatic control equipment.

In the instrument of water quality automatic continuous monitoring, for example turbidity METHOD FOR CONTINUOUS DETERMINATION instrument, chlorine residue METHOD FOR CONTINUOUS DETERMINATION instrument etc., for constant water sample flow velocity is provided, often all to set up one and gather the water tank of voltage regulation that water sample is used, this device is big casing of design, wherein be provided with intake pipe and outlet pipe, in order to make flow of water constant in the outlet pipe, generally be to establish flow-off on the outlet pipe top of water tank, a large amount of water are discharged from flow-off, thereby the water level that makes water tank often keeps this height, and under so constant drop, water flow velocity keeps constant in the outlet pipe.Sometimes, pressure increases in the outlet pipe in order to make, and cistern water level will relatively increase, and what water tank also will be done is very big very high, and the discharge capacity of corresponding overflow water also will increase, and this is very uneconomic, because casing increases, all makes troubles for the Installation and Debugging of instrument.Though existing now gas constant-voltage equipment has the little advantage of volume in light weight, it also is not suitable for the control of fluid pressure.

The purpose of this utility model is to provide a kind of volume little, in light weight, need not use the automatic constant-pressure device of earial drainage again, when this manostat is used for constant voltage, when incoming pressure when 0.5～4.0bar changes, its delivery pressure is adjustable to a certain numerical value, 0.4bar for example, and it can keep this numerical value constant automatically.In addition, when manostat is used for the flow velocity of constant flow of liquid, when incoming pressure when 0.5～4.0bar changes, the speed of its output liquid stream also is adjustable to the numerical value of a requirement, for example keeps 11/min constant.

The purpose of this utility model is achieved in that the liquid P of variation in pressure ₁Flow into inlet opening and cavity A by liquid inlet pipe, enter the B chamber by valve again, set up in a certain position when the jackscrew of pressure spring, system reaches balance, and output fluid pressure is P ₂If liquid inlet pipe pressure P ₁Small rising has been arranged, pressure in the B of chamber increases thereupon, the attached plate of glued membrane moves up, thread screw top original and on the glued membrane contacts and the club shape valve rod that keeps balance also moves up owing to the effect of spring 5 thereupon, the mobile gap that reduces valve of valve rod, liquid flowing resistance strengthens, and then outlet pressure P2 drops to original state of equilibrium.In like manner, if the import flow stream pressure has small decline, the pressure in the B of chamber reduces thereupon, because the effect of spring 18, club shape valve moves down, and has increased valve clearance, liquid flowing resistance reduces, and system makes output flow stream pressure P2 return to original state of equilibrium, thereby reaches the effect of voltage stabilizing.

The utility model can be used for instrument, instrument, automatic control equipment of requirement delivered constant fluid pressure etc., the utility model automatic constant pressure, and not electricity consumption need not used earial drainage again, so easy to install.

Accompanying drawing 4 is that the utility model is applied to the characteristic working curve in the analytical instrument of water quality, from then on can see in the curve when input hydraulic pressure when 0.2bar is increased to 4.0bar, its output flow all remains on 11/min and does not change.

Accompanying drawing 1 is a structure sectional drawing of the present utility model.

Accompanying drawing 2 is a plan view in kind of the present utility model.

Accompanying drawing 3 is installed and fixing screw sectional drawing for the utility model.

Below in conjunction with accompanying drawing the utility model is described further: it is to be made of the upper end cap of two circles and lower end cap, the attached plate three parts of circular diaphragm.As shown in Figure 1, liquid inlet pipe joint 10 is housed on the lower end cap 1, its other end is pressed rubber cushion 9 and is fixed on the end cap, and be communicated with and cavity A with inlet opening 8, tubaeform valve base 7 and club valve 4 are arranged among the A of chamber, adjustable helical spring seat 3, the three coexists on the axis of lower end cap central authorities.Spring seat is furnished with screw thread and is connected with center hole, be equipped with CONCENTRIC REDUCER spring 5 on the spring seat, the big headstock of spring is in this seat, its little crown is enclosed within on the ball of club shape valve, spring seat is with annular half slot 2 outward, is placed with O shape cushion rubber in the half slot, and O shape cushion rubber closely contacts with center hole wall 6, prevent to leak with sealing liquid, lower end cap also is equipped with threaded drain pipe 20; It is made up of the attached plate of circular diaphragm the elastic plastic film 11 circular corrosion resistant plate 12 identical with attached to it two block sizes, and it is fixed by tack stainless steel screw 15 and nut 21 in its center; Upper end cap 13 is provided with pore 14, and central authorities are provided with bourdon tube 19, and bourdon tube one end is fixed in end cap central authorities, and the other end is stamped vinyl cover 17.Be placed with spring 18 in the bourdon tube, its an end seat is on tack stainless steel screw 15, and the other end is pressed in the groove of jackscrew 16, and the three center coexists on the end cap central axis.

Pressure is P ₁Input liquid stream enter among the A of chamber by inlet opening 8, valve base 7 and club shape valve 4 are arranged among the A of chamber, spring seat 3, CONCENTRIC REDUCER spring 5, the A chamber can be communicated with by valve with the B chamber, liquid flows P ₂At last from drain pipe 20 outputs.Circular as shown in Figure 2 plastic film and end cap up and down by eight uniform screw fixings together, in case leak of liquid; Contact with the club of club valve 4 by tack stainless steel screw 15 tops, flexible plastic film 11 is moved up and down with circular corrosion resistant plate 12, play the constant effect of flow stream pressure.When regulating jackscrew 16, can change the delivery pressure P of manostat ₂

Claims

1. the manostat of an automatic stabilisation flow stream pressure comprises upper end cap, lower end cap, the attached plate three parts of circular diaphragm, it is characterized in that:

1.1 on its circular upper end cap 13 pore 14 is arranged, there is bourdon tube 19 in central authorities, and pressure spring 18 is arranged in the bourdon tube, spring top is pressed with adjustable jackscrew 16, and there is vinyl cover 17 the bourdon tube outside;

1.2 the attached plate portion of its circular diaphragm includes: circular plastic film 11, circular corrosion resistant plate 12, tack stainless steel screw 15, nut 21;

1.3 pressure spring 18 1 end seats are gone in the circular groove of jackscrew 16, an end is enclosed within on the tack stainless steel screw 15, and the three center coexists on the end cap central axis;

1.4 the pipe joint 10 and 20 of liquid in-out stream is housed respectively on its circular lower end cap 1, and the liquid inlet pipe joint communicates with inlet opening 8 by rubber cushion 9, inlet opening communicates with its central chamber A.Spring seat 3, club shape valve 4, valve base 7 are arranged among the A of chamber, and above-mentioned three coexists on the axis of lower end cap central authorities;

1.4.1 valve base 7 center holes are tubaeform, it and club shape valve 4, CONCENTRIC REDUCER spring 5, tack stainless steel screw 15 threes constitute automatic valve;

1.4.2 helical spring seat 3 outer is with annular half slot 2, is placed with O shape cushion rubber in the half slot and closely contacts with center hole wall 6, the other end has screw thread, can move up and down in the A chamber;

1.5 its three part is fastening with eight screws that are distributed on the disc edge, the three is integrated.

2. the constant device of flow stream pressure according to claim 1 is characterized in that the club of club valve 4 and contacting of tack stainless steel screw 15.

3. the constant device of flow stream pressure according to claim 1 is characterized in that spring 18 1 end seats are on the tack stainless steel screw.