CN202228745U

CN202228745U - Equal differential pressure valve in flow regulating valve

Info

Publication number: CN202228745U
Application number: CN2011202371328U
Authority: CN
Inventors: 梁明剑; 姚德生; 姚伟华
Original assignee: SHENYANG GUANNENG GAS TURBINE TECHNOLOGY CO LTD
Current assignee: Xiamen zhongguanneng Gas Turbine Technology Co., Ltd
Priority date: 2011-07-07
Filing date: 2011-07-07
Publication date: 2012-05-23
Anticipated expiration: 2021-07-07

Abstract

The utility model provides an equal differential pressure valve in a flow regulating valve, which aims at solving the following problem: in using occasions of a regulating valve at present, downstream pressure often fluctuates to cause oil pump capacity to fluctuate. The key points of the equal differential pressure valve are that a metering valve and a equal differential pressure valve are arranged, and the metering valve and the equal differential pressure valve are integrated on one valve body; the equal differential pressure valve comprises a piston, an oil chamber on one side of the piston is communicated with a valve core rear channel of the metering valve, and the other side of the piston is arranged on a channel between a valve core front channel and a valve oil return hole. The equal differential pressure valve in the flow regulating valve has the beneficial effects that the flow is in a linear relation with the angular travel of a valve core and has no relation with the valve outlet pressure, so that the requirement on the regulating valve can be met; and secondly, the regulation on the flow has the effects of speeding up at a low speed and slowing down at a high speed, so that the safety of power equipment can be guaranteed.

Description

Valve such as pressure reduction such as grade in the flow control valve

Technical field

The utility model relates to the liquid fuel flow control valve that uses on a kind of transfer line, is the valve such as pressure reduction such as grade in the flow control valve specifically.

Background technique

Use a kind of liquid fuel to regulate (metering) valve at present on the high power engines such as state's internal-combustion gas turbine engine, internal-combustion engine; The basic demand of this modulating valve is; No matter how downstream pressure fluctuates; The oil pump capacity of valve should be controlled, saidly controlledly is meant that the oil pump capacity of valve and the angle of swing of spool should be linear relationships.In the use occasion of above-mentioned modulating valve, downstream pressure is often fluctuation, causes the oil pump capacity fluctuation, and is uncontrollable.Present homemade liquid fuel modulating valve ubiquity the problems referred to above, regulating ratio is little, poor reliability.

Summary of the invention

For solving the problems of the technologies described above, the purpose of the utility model is to provide the valve of the pressure reduction such as grade in a kind of flow control valve.

The purpose of the utility model is achieved in that it has the metering valve of bivalve seat, and has abandoned the structure of needle type valve, it is characterized in that: it is made up of the differential pressure controller and the valve of control return opening size;

Differential pressure controller is; Pressure reduction adjusting screw 21, spring 22, piston 20, bead 11, spring seat 12, spring 14 and spring cup 13 set gradually; Piston 20 is arranged between spool ante-chamber P1 and the spool back cavity P2, presses in the Pm of chamber during bead 11, spring seat 12 and spring 14 are arranged on; Spool ante-chamber P1 is communicated with the spool prepass; The side that channel connection behind spool back cavity P2 and the spool, piston 20 are positioned at the spool ante-chamber is spill, and the spring 22 in the spool ante-chamber is arranged between pressure reduction adjusting screw and piston 20 spills; The side that piston 20 is positioned at the spool back cavity has piston rod; On the partition between spool back cavity and the middle pressure chamber, circular hole is arranged, piston rod stretches into circular hole, and spring 14 is arranged between spring seat 12 and the spring cup 13; The piston rod head and spring seat 12 outsides all are spill, and bead is clamped between the piston rod and spring seat 12 outsides; In press between chamber Pm and the spool ante-chamber P1 and establish two sections passages, near the diameter of the first passage 33 of middle pressure chamber Pm section less than the diameter near the second channel 32 of spool ante-chamber P1 section, the diameter of the diameter＜bead 11 of the diameter＜circular hole of first passage 33;

The valve of control return opening size is; One side of return opening piston 19 is control chamber Pc, and the piston 19 in this chamber is spill, and spring 17 is arranged between spring cup 18 and return opening piston 19 spills; The opposite side of return opening piston 19 is on the passage between spool prepass and the return opening 31; Control chamber Pc is communicated with middle pressure chamber Pm, and the left and right moving control of piston 19 size of return opening, and return opening 31 is a triangle.

Description of drawings

Further specify the utility model below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of flow control valve.

Fig. 2 is the A-A sectional view of Fig. 1, and this figure only keeps spool and seal ring, and other omits.

Fig. 3 is that the Y of Fig. 1 is to view.

Embodiment

Referring to Fig. 1, said metering valve is, spool 5 is set on the passage of valve body, two valve seats are seal ring 8 and spring 7, and spool is horizontal drum, and the drum mouth is towards valve export 34, and promptly the drum inner chamber becomes the part of passage P2 behind the spool; The rotating shaft 5-1 that fixedly has spline in the basolateral center of circle of drum, with the bearing 4 interior interplanting drive fits on the valve body, stretch out outside the valve body rotating shaft 5-1 outer end that has spline; Cooperate with drive unit such as speed reducer; Transmit the moment of torsion that supplies the spool rotation, pointer 1,3rd, bearing cap are installed in rotating shaft; Can the calibration dish on it, cooperate the angle of swing that is used for indicating spool with pointer; On the drum sidewall, open two valve port 5-2, these two valve ports are symmetrical distribution in drum rotating shaft both sides, each valve port rectangle that is as the criterion, and said accurate rectangle is meant that two ends are the circular arc (referring to Fig. 2) of same curvature and length; Respectively there are a seal ring, spring 7 to be arranged on seal ring and sealing cover 6, between 10, seal ring to be pressed on the spool drum outside reliably in the outside of each valve port (drum outside just); The spool prepass is divided into two subchannels before seal ring, lead to two seal rings up and down respectively.Fuel oil is gone into from valve inlet 30, passes through passage to valve export 34 behind spool prepass, seal ring, valve port, the spool successively.When rotating shaft was rotated, seal ring was static, and the area of valve port in seal ring regulated flow along with the angle of rotation stroke of spool is linear change.

The fluid flow formula of modulating valve of flowing through is F=KA (Δ P) ^1/2, K is a flow coefficient in the formula, and A is the area of valve port, and Δ P=P1-P2 represents the pressure reduction of the forward and backward passage of spool.If Δ P is a steady state value, then F and A are linear, and further, the angle stroke of F and spool 5 is linear, with the valve export pressure independent.

In the actual use of modulating valve, passage is that the pressure of valve export is often fluctuation behind the spool.For guaranteeing that Δ P is a steady state value, the utility model has also designed and has waited the pressure reduction valve, waits pressure reduction valve and metering valve to be integrated on the valve body 9.The size of regulating return opening according to the variation of valve export pressure P 2 Deng the pressure reduction valve, and then change P1, to keep Δ P constant.

Form by the valve of differential pressure controller and control return opening size etc. at the pressure reduction valve;

Differential pressure controller is; Pressure reduction adjusting screw 21, spring 22, piston 20, bead 11, spring seat 12, spring 14 and spring cup 13 set gradually; Piston 20 is arranged between spool ante-chamber P1 and the spool back cavity P2, presses in the Pm of chamber during bead 11, spring seat 12 and spring 14 are arranged on; Spool ante-chamber P1 is communicated with the spool prepass; The side that channel connection behind spool back cavity P2 and the spool, piston 20 are positioned at the spool ante-chamber is spill, and the spring 22 in the spool ante-chamber is arranged between pressure reduction adjusting screw and piston 20 spills; The side that piston 20 is positioned at the spool back cavity has piston rod; On the partition between spool back cavity and the middle pressure chamber, circular hole is arranged, piston rod stretches into circular hole, and spring 14 is arranged between spring seat 12 and the spring cup 13; The piston rod head and spring seat 12 outsides all are spill, and bead is clamped between the piston rod and spring seat 12 outsides; In press between chamber Pm and the spool ante-chamber P1 and establish two sections passages, near the diameter of the passage 33 of middle pressure chamber Pm section less than the diameter near the passage 32 of spool ante-chamber P1 section, the diameter of the diameter＜bead 11 of the diameter＜circular hole of passage 33.

The valve of control return opening size is; One side of return opening piston 19 is control chamber Pc, and the piston 19 in this chamber is spill, and spring 17 is arranged between spring cup 18 and return opening piston 19 spills; The opposite side of return opening piston 19 is on the passage between spool prepass and the return opening 31; Control chamber Pc is communicated with middle pressure chamber Pm, and the left and right moving control of piston 19 size of return opening, and return opening 31 is triangle (referring to Fig. 3).

Working procedure is, when P2 pressure raise, piston 20 was moved to the left under the effect of P2 pressure and spring 14, and bead 11 also is moved to the left; Block circular hole (as shown in Figure 1), make the liquid in Pm chamber flow to the P2 chamber through this circular hole, the Pm chamber only is communicated with the P1 chamber; So Pm pressure can rise, owing to the Pc chamber communicates with the Pm chamber, so Pc pressure also can rise; Piston 19 is moved to the left under the effect of pressure P c and spring 17, and return opening diminishes, and the oil return flow reduces; And valve inlet 1 flow is constant, so P1 pressure rises, promptly P1 raises with P2 pressure; When P2 pressure descended, piston 20 was moving right, and bead 11 also moves right, and circular hole is opened; The flow direction P2 chamber in Pm chamber, and the flow that replenishes to Pm greater than the P1 chamber of its flow velocity, Pm pressure descends, so Pc pressure also can descend; Piston 19 moves right, and valve export 2 becomes big, and the oil return flow increases; The valve inlet flow is constant, so P1 pressure descends, promptly P1 descends with P2 pressure.This adjustment process at the pressure reduction valve is dynamic fully, and has guaranteed Δ P=constant.

In addition, the modulating valve that acts as a fuel hopes that the adjusting of its flow has the effect that quickening slowly subtracts, to guarantee the safety of power equipment.In order to realize this purpose, on the passage between control chamber Pc and the middle pressure chamber Pm, be provided with the buffering quick-realse valve, specifically be, taper valve core 16 with holes is arranged in the taper buffer cavity Pn, and spring 15 is arranged between buffer cavity wall and the taper valve core.As Pm>during Pc, the central small hole that the fuel oil in Pm chamber will pass through taper valve core 16 with holes flows into the Pc chamber; Otherwise < when taper valve core 16 with holes still was pressed on the housing by spring 15 during Pc, the central small hole that the fuel oil in Pc chamber will pass through taper valve core 16 with holes flowed back to the Pm chamber as Pm; < < during Pc, and taper valve core with holes 16 is when overcoming spring 15 pressure and leaving housing, and the fuel oil in Pc chamber will pass through the central small hole of taper valve core 16 with holes and the slit between spool and housing flows back into the Pm chamber fast, and this design can make bypass valve close soon slowly and open as Pm; In addition, the triangular windows of bypass valve also makes the adjusting of P1 pressure realize rising slowly the purpose of falling soon.Through can finding out by flow formula, P1 is pressure controlled rise slowly fall soon promptly realized Flow-rate adjustment accelerate the effect that subtracts slowly.

Compared with prior art, the beneficial effect of the utility model is:

1, etc. the use of pressure reduction valve makes that the angle stroke of flow F and spool is linear, and with the valve export pressure independent, satisfy the requirement of fluid flow modulating valve.

2, the adjusting of flow has the effect that quickening slowly subtracts, and has guaranteed the safety of power equipment as the liquid fuel modulating valve.

3, regulating ratio can be realized accurate adjusting greater than 100 in the small flow zone.

4, because the effect of spring makes valve seat be close to spool constantly,, spool make valve have good self-cleaning ability when rotating because of friction.

5, spool and valve seat are installed on the passage of valve body, only need be when needing cleaning to safeguard with the inlet line dismounting of valve, and spool and metering window thereof can be visible fully, make the cleaning of valve safeguard conveniently very easy.

6, when spool, the prooving of valve seat, the spring of setting can play compensating action, has not only prolonged the working life of valve, and the head that has also prolonged valve turns over the phase (valve is the time of depot repair first).

Claims

1. wait the pressure reduction valve in the flow control valve, it is characterized in that: it is made up of the differential pressure controller and the valve of control return opening size;

Differential pressure controller is; Pressure reduction adjusting screw (21), spring (22), piston (20), bead (11), spring seat (12), spring (14) and spring cup (13) set gradually; Piston (20) is arranged between spool ante-chamber (P1) and the spool back cavity (P2), presses lining, chamber (Pm) during bead, spring seat (12) and spring (14) are arranged on; Spool ante-chamber (P1) is communicated with the spool prepass; Channel connection behind spool back cavity (P2) and the spool, the side that piston (20) is positioned at the spool ante-chamber is spill, and the spring in the spool ante-chamber (22) is arranged between pressure reduction adjusting screw and piston (20) spill; The side that piston (20) is positioned at the spool back cavity has piston rod; On the partition between spool back cavity and the middle pressure chamber, circular hole is arranged, piston rod stretches into circular hole, and spring (14) is arranged between spring seat (12) and the spring cup (13); Piston rod head and spring seat (12) outside all is spill, and bead is clamped between the piston rod and spring seat (12) outside; The middle pressure between chamber (Pm) and the spool ante-chamber (P1) established two sections passages; Near the diameter of the first passage (33) of middle pressure chamber (Pm) section less than the diameter near the second channel (32) of spool ante-chamber (P1) section, the diameter of the diameter＜bead of the diameter＜circular hole of first passage (33);

The valve of control return opening size is; One side of return opening piston (19) is control chamber (Pc); Piston in this chamber (19) is spill, and spring (17) is arranged between spring cup (18) and return opening piston (19) spill, and the opposite side of return opening piston (19) is on the passage between spool prepass and the return opening (31); Control chamber (Pc) is communicated with middle pressure chamber (Pm), and return opening (31) is a triangle.

2. according to the valve such as pressure reduction such as grade in the described flow control valve of claim 1; It is characterized in that: on the passage between control chamber (Pc) and the middle pressure chamber (Pm), be provided with the buffering quick-realse valve; Specifically be; Taper valve core with holes (16) is arranged on taper buffer cavity (Pn) lining, and spring (15) is arranged between buffer cavity wall and the taper valve core.