CN101900145A - High-pressure overflow valve - Google Patents

Abstract

The invention relates to a high-pressure overflow valve, which comprises a valve base, a valve rod and a valve core, wherein the valve core comprises an oil compensating valve core and an overflow valve core; the valve base is a cylinder with an open end and a closed end; the open end of the valve base is provided with external screw threads; a first spring, a spring cover and a second spring are arranged in the valve base in turn; the spring cover is in clearance fit with the valve base; the upper end of the valve rod is fixedly connected with the spring cover, and the lower end of the valve rod is provided with the overflow valve core; the lower end of the second spring is mounted in the spring base; the oil compensating valve core with an overflow valve port is arranged below the spring base; an oil opening is formed between the oil compensating valve core and the spring base; the valve rod penetrates through the overflow valve port; and the overflow valve core is matched with the bottom of the overflow valve port in a dynamic sealing way. In high-pressure overflow valve, a pilot valve, a damping hole and an elongated hole in the prior art are not used, so that the structure is simplified, the processing and use cost are reduced, the antipollution capability is strong and the installation and maintenance are convenient; and a sealing part is removed by spherical and conical sealing, so that the structure is simple.

Description

High-pressure overflow valve

Technical field

The present invention relates to the relief valve in the hydraulic system, specifically a kind of high-pressure overflow valve.

Background technique

Relief valve is absolutely necessary in hydraulic system, and it generally plays level pressure overflow effect and safety protection effect.A kind of relief valve commonly used is the unidirectional plug-in mounting relief valve of leading type, can protective system transship on the one hand, and forward is opened, and makes system's release; Simultaneously, owing to when revealing oil starvation, can oppositely open, give system's repairing when system circuit.Pilot operated compound relief valve, form by pilot valve and main valve, pilot valve is used to regulate main valve epicoele hydraulic coupling, and main valve plug chamber hydraulic action and spring force acting in conjunction thereon balances each other with the cavity of resorption hydraulic action down, by pilot valve qualification main valve pressure and main valve overflow.The structure of relief valve complexity of leading type has damping hole and elongated hole structure on the pilot valve, contamination resistance is poor, machining accuracy height, cost height.

Summary of the invention

The present invention is directed to the problems referred to above, the high-pressure overflow valve that a kind of contamination resistance is strong, simple in structure, cost is low is provided.

According to technological scheme of the present invention: a kind of high-pressure overflow valve, comprise valve seat, valve rod and spool, described spool comprises repairing spool and overflow spool, described valve seat is the cylindrical shell of an end opening one end sealing, the opening end of described valve seat is provided with outside thread, order is equipped with first spring in the described valve seat, the spring cup and second spring, Spielpassung between spring cup and the described valve seat, the upper end of described valve rod is fixedly connected on the described spring cup, the lower end of described valve rod is provided with described overflow spool, the lower end of described second spring is installed in the spring seat, be provided with the described repairing spool that has the overflow valve port below the spring seat, be provided with hydraulic fluid port between repairing spool and the described spring seat, described valve rod passes described overflow valve port, and the motive sealing of described overflow spool is engaged in the bottom of described overflow valve port.

Described first spring is a taper spring, and the big end of described taper spring upwards.

Described second spring is a cylindrical spring.

The middle part of described spring cup is provided with outstanding rhabodoid downwards, and described second spring housing is contained on the described rhabodoid.

The upper end of described valve rod is threaded on the described spring cup, and the upper end of described valve rod is provided with screw.

Described repairing spool and described spring seat are structure as a whole, and the sealing surface of described repairing spool is the ball sealing surface.

The sealing surface of described overflow spool is the circular cone sealing surface.

The closed end of described valve seat is provided with the outer-hexagonal header structure.

Technique effect of the present invention is: the present invention has removed pilot valve of the prior art, simplifies the structure, and removes damping hole and elongated hole, has reduced processing and user cost, and contamination resistance is strong, and installation and maintenance are convenient; By sphere and conical surface seal, removed Sealing, simple in structure.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.

As shown in Figure 1, the present invention is a kind of high-pressure overflow valve, comprises valve seat 1, valve rod 12 and spool, and spool comprises repairing spool 7 and overflow spool 10.

Valve seat 1 is the cylindrical shell of an end opening one end sealing, and the opening end of valve seat 1 is provided with outside thread, and the closed end of valve seat 1 is provided with the outer-hexagonal header structure.The outside thread of valve seat 1 and outer-hexagonal header structure are convenient to the present invention is threaded on the plug-in mounting block 4.

Order is equipped with first spring 15, spring cup 2 and second spring 3 in the valve seat 1.Spielpassung between spring cup 2 and the valve seat 1.First spring 15 is a taper spring, and the big end of taper spring upwards, and taper spring has guaranteed good centering and opening feature.Second spring 3 is a cylindrical spring.The upper end of valve rod 12 is fixedly connected on the spring cup 2, and the lower end of valve rod 12 is provided with above-mentioned overflow spool 10, and the sealing surface of overflow spool 10 is the circular cone sealing surface.The lower end of second spring 3 is installed in the spring seat 6, is provided with the above-mentioned repairing spool 7 that has overflow valve port 8 below the spring seat 6.Repairing spool 7 is structure as a whole with spring seat 6, and the sealing surface of repairing spool 7 is the ball sealing surface.Be provided with hydraulic fluid port 11 between repairing spool 7 and the spring seat 6, valve rod 12 passes overflow valve port 8, and 10 motive sealings of overflow spool are engaged in the bottom of overflow valve port 8.

The middle part of spring cup 2 is provided with outstanding rhabodoid downwards, and second spring 3 is sleeved on the rhabodoid.

The upper end of valve rod 12 is threaded on the spring cup 2, and the upper end of valve rod 12 is provided with screw 14, and screw 14 is used for regulating the spring force of second spring 3.

Spring cup 2, valve rod 12, spring seat 6, repairing spool 7 and overflow spool 10 are formed mangetic core assembly.

When the present invention uses, be threaded on the plug-in mounting block 4 in the hydraulic system, between valve seat 1 and plug-in mounting block 4, be provided with seal ring 13, the opening end of valve seat 1 is corresponding with the filler opening 5 on the plug-in mounting block 4, and the repairing valve port 16 of return opening 9 upper ends on repairing spool 7 and the plug-in mounting block 4 is corresponding.

The present invention compares with the unidirectional plug-in mounting relief valve of leading type, has removed pilot valve, dexterously one-way valve and relief valve is combined, and controls cracking pressure by spring force, becomes direct-acting type.The present invention simplifies the structure on the basis of the unidirectional plug-in mounting relief valve of original leading type, removes damping hole and elongated hole, has reduced processing and user cost, and contamination resistance is strong, and installation and maintenance are convenient; By sphere and conical surface seal, optimized sealing configuration, removed Sealing, simple in structure.The present invention fully can the alternative structure complexity, the precursor overflow valve of processing cost height, contamination resistance difference.

Working procedure of the present invention is as follows:

1, play the one-way valve effect:

Do the time spent, the mangetic core assembly and the first spring 15(taper spring when playing an one-way valve), repairing valve port 16 works together, forward is opened, and gives system's repairing, oppositely closes, and stops high pressure unloading.

When filler opening 5(P mouth) pressure and the first spring 15(taper spring) the making a concerted effort of spring force less than return opening 9(T mouth) during pressure, this type of situation generally is that the system element leakage makes pipeline inhale sky, pressure moment reduces, mangetic core assembly moves up, repairing spool 7 leaves the repairing valve port 16 of return opening 9 upper ends, repairing valve port 16 is opened, and oil enters into system, gives system's repairing.

When P mouth pressure and taper spring spring force make a concerted effort greater than the T mouth pressure time, mangetic core assembly moves down, repairing valve port 16 is closed, the blocking-up oil circuit is avoided high pressure unloading, guarantees system's proper functioning.

The sealing of one-way valve is except outside the Pass the precision with processing accessories has, and pressure also is important, and along with the increase of P mouth pressure, sealing effect is better.

2, play the relief valve effect:

Do the time spent, the mangetic core assembly and the second spring 3(cylindrical spring when playing a relief valve), overflow valve port 8 works together, forward is opened, and plays the safety protection effect, by second spring, 3 adjusting cracking pressures, decision systems maximum pressure.

When the P mouth pressure greater than the second spring 3(cylindrical spring) during spring force, the cylindrical spring compression, overflow valve port 8 is opened, high pressure unloading, restriction system pressure plays the safety protection effect.

The present invention has the following advantages:

1, architecture advances is removed former damping hole, and elongated orifices has reduced the sealing part.

2, sealing face adopts the structure that the conical surface and sphere combine, and sealing and assembling are better.

3, use the circular cone spring, guaranteed good centering and opening feature.

4, increase flow area, improved the runner mouth.

5, unloading time is short, reflect sensitivelyer, and power loses little.

Claims (8)

1. high-pressure overflow valve, comprise valve seat (1), valve rod (12) and spool, it is characterized in that: described spool comprises repairing spool (7) and overflow spool (10), described valve seat (1) is the cylindrical shell of an end opening one end sealing, the opening end of described valve seat (1) is provided with outside thread, order is equipped with first spring (15) in the described valve seat (1), spring cup (2) and second spring (3), Spielpassung between spring cup (2) and the described valve seat (1), the upper end of described valve rod (12) is fixedly connected on the described spring cup (2), the lower end of described valve rod (12) is provided with described overflow spool (10), the lower end of described second spring (3) is installed in the spring seat (6), be provided with the described repairing spool (7) that has overflow valve port (8) below the spring seat (6), be provided with hydraulic fluid port (11) between repairing spool (7) and the described spring seat (6), described valve rod (12) passes described overflow valve port (8), and described overflow spool (10) motive sealing is engaged in the bottom of described overflow valve port (8).

2. according to the described high-pressure overflow valve of claim 1, it is characterized in that described first spring (15) is a taper spring, and the big end of described taper spring upwards.

3. according to claim 1 or 2 described high-pressure overflow valves, it is characterized in that described second spring (3) is a cylindrical spring.

4. according to the described high-pressure overflow valve of claim 3, it is characterized in that the middle part of described spring cup (2) is provided with outstanding rhabodoid downwards, described second spring (3) is sleeved on the described rhabodoid.

5. according to the described high-pressure overflow valve of claim 1, it is characterized in that the upper end of described valve rod (12) is threaded on the described spring cup (2), the upper end of described valve rod (12) is provided with screw (14).

6. according to the described high-pressure overflow valve of claim 1, it is characterized in that described repairing spool (7) and described spring seat (6) are structure as a whole, the sealing surface of described repairing spool (7) is the ball sealing surface.

7. according to the described high-pressure overflow valve of claim 1, the sealing surface that it is characterized in that described overflow spool (10) is the circular cone sealing surface.

8. according to the described high-pressure overflow valve of claim 1, it is characterized in that the closed end of described valve seat (1) is provided with the outer-hexagonal header structure.