CN102537444A

CN102537444A - Miniature front pressure-reducing valve type ultrahigh pressure overflow valve

Info

Publication number: CN102537444A
Application number: CN201210008069XA
Authority: CN
Inventors: 周晓君; 余敏超; 刘吉成; 刘树林; 翟宇毅
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2011-05-11
Filing date: 2012-01-12
Publication date: 2012-07-04
Anticipated expiration: 2032-01-12
Also published as: CN102537444B

Abstract

The invention relates to a miniature front pressure-reducing valve type ultrahigh pressure overflow valve, which comprises a valve seat, a constant difference pressure-reducing valve and an overflow valve. The pressure-reducing valve is connected with the valve seat through a bolt and fixed onto a bottom plate, the space between the valve seat and the constant difference pressure-reducing valve is sealed by a copper gasket and a rubber gasket, the space between the sealing bolt and the constant difference pressure-reducing valve is sealed by a copper gasket, a spring cavity in the constant difference pressure-reducing valve is communicated with a valve cavity through a damping hole, a valve spool and a pressure-reducing valve body are sealed by an O-shaped rubber ring, the upper end of a spring of the constant difference pressure-reducing valve contacts with an overflow valve body, and the lower end of the spring presses the valve spool on the valve seat through a spring seat. The overflow valve body is connected onto the pressure-reducing valve through a bolt, the space between the overflow valve body and the pressure-reducing valve body is sealed by a copper gasket and a rubber gasket, a valve cover is connected with the overflow valve body in a threaded manner and sealed by a copper gasket, the valve seat of the overflow valve is connected with the overflow valve body in a threaded manner, the valve seat and the overflow valve body are sealed by a rubber gasket, a spring of the overflow valve presses a valve spool on the valve seat through a spring seat, the valve cover is connected with the overflow valve body through a bolt, and a handle is connected with the valve cover in a threaded manner. The miniature front pressure-reducing valve type ultrahigh pressure overflow valve has the advantages of easiness in adjusting system pressure, fine stability and long service life.

Description

Miniature preposition reduction valve formula ultrahigh pressure relief valve

Technical field

What the present invention relates to is a kind of miniature preposition reduction valve formula ultrahigh pressure relief valve, is applied in that to keep system pressure in the Superhigh Pressure Hydraulic System stable.

Background technique

The applied more and more of superhigh pressure technique in industry and scientific research, experimental liquid pressing system realize that ultrahigh pressure is the method for generally taking.The pressure that hydraulics in the practical applications adopts usually is in the 32MPa; Therefore the development of the following hydraulic element of 32MPa has been a mature technique; And the relevant a lot of companies of product can choose when all having off-the-shelf to carry out design of Hydraulic System with producer, but for the ultrahigh-pressure hydraulic element particularly the ultrahigh pressure relief valve study also seldom now.Conventional relief valve mainly contains straight ejector half and type pilot, and general rated pressure is all below 32MPa.The relief valve of straight ejector half is general to be used under the situation lower at pressure, that flow is less, and under the situation that the use of the relief valve of type pilot is higher at pressure, flow is bigger.But in order to improve system effectiveness, general flow is all smaller, about 1L/min in the extra high voltage system.If adopt the type pilot form, can cause leakage rate, pressure overshoot figureofmerit to descend significantly, and because the ultrahigh pressure relief valve adopts special material should not make valve arrangement complicated, manufacturability is poor.And when adopting straight ejector half relief valve, because the spring force that acts on the spool directly balances each other with the hydraulic coupling that acts on the spool, thereby when system pressure was higher, the rigidity of pressure adjusting spring was bigger.At this moment, can cause that the relief valve open and shut characteristic is poor, pressure is inhomogeneous, problems such as poor work stability.

Summary of the invention

The object of the invention provides a kind of miniature preposition reduction valve formula ultrahigh pressure relief valve; Can pilot pressure in the hydraulic system of 80-125MPa; And employed relief valve flow is little in the solution Superhigh Pressure Hydraulic System, and the big adjusting of spring rate is inconvenient, and pressure reduction causes leakage greatly easily; Spool shortened the valve seat impact force ambassador relief valve life-span, and cavitation sends very big problems such as noise.

The present invention is that the design that solves the problems of the technologies described above employing is: the ultrahigh pressure relief valve is by Fixed differential reducing valve and relief valve is organic is composed in series; It is characterized in that: said Fixed differential reducing valve at first reduces certain pressure with the ultrahigh pressure flow when system pressure surpasses set pressure, and then carries out overflow through relief valve; Said Fixed differential reducing valve is made up of valve body, spool, valve seat, spring, support block, for the high-pressure and hydraulic oil through relief valve reduces certain pressure; Said relief valve is made up of valve body, spool, valve seat, spring, support block, handle etc., and spool unlatching carrying out overflow guarantees that system pressure is stable when surpassing the relief valve set pressure through the post-decompression hydraulic oil of reduction valve.

According to the foregoing invention design, the present invention adopts following technical proposals: a kind of miniature preposition reduction valve formula ultrahigh pressure relief valve, comprise valve seat, Fixed differential reducing valve and relief valve, and it is characterized in that: said valve seat has fixed hole, oil inlet P, outlet T; Said reduction valve connects valve seat through bolt and is fixed on the base plate; Adopt copper packing ring and rubber ring seal between said valve seat and the Fixed differential reducing valve; Adopt the copper washer sealing between sealing bolt and the Fixed differential reducing valve, the spring chamber in the said Fixed differential reducing valve is communicated with through damping hole and valve pocket, said spool and the seal with elastometic washer of relief valve body employing O type; The spring upper end of said Fixed differential reducing valve contacts with the relief valve valve body, and the lower end is pressed in spool on the valve seat through spring seat; The valve body of said relief valve is connected on the reduction valve through bolt, adopts copper packing ring and rubber ring seal between the valve body of said relief valve and the relief valve body, and a valve gap is connected with valve body through screw thread; Adopt the copper washer sealing; The valve seat of said relief valve and valve body adopt rubber ring seal through being threaded, and the spring of said relief valve is pressed in spool on the valve seat through spring seat; A valve gap links to each other with valve body through bolt, and a handle is connected with valve gap through screw thread.

The spool end of the spool of said Fixed differential reducing valve and relief valve is equipped with annular diversion disk, and should be processed into arc by the annular diversion disk.

The valve seat of said Fixed differential reducing valve and the restriction place between the spool are stepped shaft, form the two-step throttle mouth; The valve seat of said relief valve and the restriction place between the spool are trapezoidal, form the two-step throttle mouth.

The present invention compared with prior art; Have following conspicuous outstanding practicability characteristics and remarkable result: (1) is if to directly adopting relief valve that superhigh pressure liquid is carried out overflow; The rigidity that must add big spring for the balance super high pressure fluid to the active force of spool; Cause and regulate difficulty, insensitive; The present invention adopts the mode of Fixed differential reducing valve and relief valve series connection to carry out poor surely decompression overflow more earlier, like this spring rate of reduction valve and relief valve can design smaller, can regulate easily system pressure; (2) because hydraulic fluid pressure flow velocity high, when passing through restriction is fast, spool is had very big steady-state fluid force, the spool of the present invention's design has annular diversion disk; Owing to when liquid flows out restriction diversion disk is had impact force; The steady-state fluid force of a balance part, the dynamic performance of raising relief valve, and annular diversion disk is processed into arc; Reduce air pocket, the formation of cavitation erosion; (3) because rubber seal can not be applied in the ultra-high voltage environment, superhigh pressure sealing of the present invention adopts the copper seal ring, has well solved sealing problem; (4) in extra high voltage system,, cause air pocket, cavitation phenomenon easily because oil pressure is very high; The air pockets erosion is very big to the influence of valve body, and formed bubble can stop up restriction, and bubble eruption can cause very big noise and valve seat, spool are caused damage; Shorten the relief valve life-span; The restriction of the present invention design is the two-step throttle mouth, the cavitation erosion index of two-step throttle valve much little than the one-level throttle valve like this, and the harmfulness that cavitates to valve also reduces.

Description of drawings

Fig. 1 is the structural representation of one embodiment of the present of invention.

Embodiment

The preferred embodiments of the present invention combine detailed description of the drawings following:

Embodiment one:

Referring to Fig. 1, this miniature preposition reduction valve formula ultrahigh pressure relief valve comprises valve seat 2, Fixed differential reducing valve 13 and relief valve 20, it is characterized in that: said valve seat 2 has fixed hole, oil inlet P, outlet T; Said reduction valve connects valve seat 2 through bolt and is fixed on the base plate; Adopt copper packing ring 3 and rubber washer 1 sealing between said valve seat 2 and the Fixed differential reducing valve 13; Adopt 7 sealings of copper packing ring between sealing bolt 6 and the Fixed differential reducing valve 13; Spring chamber 11 in the said Fixed differential reducing valve 13 is communicated with through damping hole 8 and valve pocket 4; Said spool 5 adopts 9 sealings of O type rubber ring with relief valve body 14, and spring 12 upper ends of said Fixed differential reducing valve 13 contact with relief valve valve body 25, and the lower end is pressed in spool 5 on the valve seat 2 through spring seat 10; The valve body 25 of said relief valve 20 is connected on the reduction valve 13 through bolt; Adopt

copper packing ring

15,16, rubber washer 17 sealings between the valve body 25 of said relief valve 20 and the relief valve body 14; A valve gap 18 is connected with valve body 27 through screw thread, adopts 19 sealings of copper packing ring, and the valve seat 21 of said relief valve 2 and valve body 27 are through being threaded; Adopt rubber washer 22 sealings; The spring 26 of said relief valve 20 is pressed in spool 22 on the valve seat 21 through spring seat 25, and a valve gap 29 links to each other with valve body 27 through bolt, and a handle 26 is connected with valve gap 27 through screw thread.

Embodiment two:

Present embodiment and embodiment one are basic identical, and specialization is following:

The spool 5 of said Fixed differential reducing valve 13 and spool 23 ends of relief valve 20 are equipped with annular diversion disk, and should be processed into arc by the annular diversion disk.

The valve seat 2 and the restriction place between the spool 5 of said Fixed differential reducing valve 13 are stepped shaft, form the two-step throttle mouth; The valve seat 21 and the restriction place between the spool 21 of said relief valve 20 are trapezoidal, form the two-step throttle mouth.

Working principle:

Valve body 14 referring to Fig. 1 Fixed differential reducing valve 13 is fastened on the base plate and can directly be connected with base plate through bolt and valve seat 2; Hydraulic oil advances from the P mouth, when pressure surpasses the active force of 12 pairs of spools 5 of spring, moves on the spool 5, and hydraulic oil flows into valve pocket 4 from the two-step throttle mouth, and pressure reduces, and hydraulic oil flows into spring chamber 11 through damping hole 8; The pressure oil of spring chamber 11, valve pocket 4, import P is kept the fixed poor decompression of hydraulic oil to the active force of spool 5 and 12 pairs of spools 5 of spring; When fluctuation rear spring chamber 11 appears in hydraulic fluid pressure is buffer cavity, keeps pressure stability; The valve seat 2 of Fixed differential reducing valve 13 is the two-step throttle mouth with the restriction of spool 5, and spool 5 annular diversion disks are designed to arc and have alleviated the influence to valve of the air pocket that high-speed hydraulic oil causes, cavitation phenomenon; The steady-state fluid force balance that the annular diversion disk of spool 5 is impacted by hydraulic oil and spool 5 is suffered; Also design method is identical with the front with spool 23 formed restrictions for the valve seat 21 of relief valve 20; Flow into the valve pocket of relief valve 20 through Fixed differential reducing valve 13 post-decompression hydraulic oil through oilhole, when hydraulic oil surpasses the active force of 26 pairs of spools of spring to spool 23 pressure of relief valve 20, spool 23 moves to right, and restriction is opened, the hydraulic oil overflow, and it is stable to keep system pressure; The cracking pressure of can regulating handle 28 coming regulating spool through the pre compressed magnitude of Regulation spring 26, control system pressure; Because pressure is very high, sealing

gasket

3,7,15,16,19 adopts the copper packing ring.

Claims

1. a miniature preposition reduction valve formula ultrahigh pressure relief valve comprises valve seat (2), Fixed differential reducing valve (13) and relief valve (20), it is characterized in that: said valve seat (2) has fixed hole, oil inlet P, outlet T; Said reduction valve connects valve seat (2) through bolt and is fixed on the base plate; Adopt copper packing ring (3) and rubber washer (1) sealing between said valve seat (2) and the Fixed differential reducing valve (13); Adopt copper packing ring (7) sealing between a sealing bolt (6) and the Fixed differential reducing valve (13); Spring chamber (11) in the said Fixed differential reducing valve (13) is communicated with through damping hole (8) and valve pocket (4); Said spool (5) and relief valve body (14) adopt O type rubber ring (9) sealing; Spring (12) upper end of said Fixed differential reducing valve (13) contacts with relief valve valve body (25), and the lower end is pressed in spool (5) on the valve seat (2) through spring seat (10); The valve body (25) of said relief valve (20) is connected on the reduction valve (13) through bolt; Adopt copper packing ring (15), (16), rubber washer (17) sealing between the valve body (25) of said relief valve (20) and the relief valve body (14); A valve gap (18) is connected with valve body (27) through screw thread; Adopt copper packing ring (19) sealing; The valve seat (21) of said relief valve (20) and valve body (27) adopt rubber washer (22) sealing through being threaded, and the spring (26) of said relief valve (20) is pressed in spool (22) on the valve seat (21) through spring seat (25); A valve gap (29) links to each other with valve body (27) through bolt, and a handle (26) is connected with valve gap (27) through screw thread.

2. according to the said miniature preposition reduction valve formula ultrahigh pressure relief valve of claim 1; It is characterized in that: spool (23) end of the spool (5) of said Fixed differential reducing valve (13) and relief valve (20) is equipped with annular diversion disk, and should be processed into arc by the annular diversion disk.

3. according to the said miniature preposition reduction valve formula ultrahigh pressure relief valve of claim 1, it is characterized in that: the valve seat (2) of said Fixed differential reducing valve (13) and the restriction place between the spool (5) are stepped shaft, form the two-step throttle mouth; The valve seat (21) of said relief valve (20) and the restriction place between the spool (21) are trapezoidal, form the two-step throttle mouth.