CN215371228U

CN215371228U - Pilot hydraulic valve

Info

Publication number: CN215371228U
Application number: CN202121784536.9U
Authority: CN
Inventors: 夏隆魁
Original assignee: Xinxiang Hongqiang Mechanical And Electrical Technology Co ltd
Current assignee: Xinxiang Hongqiang Mechanical And Electrical Technology Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-12-31
Anticipated expiration: 2031-08-03

Abstract

The utility model discloses a pilot hydraulic valve, which comprises an upper valve cover, wherein a lower valve cover is arranged on the outer wall of the bottom of the upper valve cover, an oil inlet is formed in the outer wall of one side of the lower valve cover, an oil outlet is formed in the outer wall of the other side of the lower valve cover, a lower oil cavity is formed in the outer wall of the bottom of the lower valve cover, a main oil cavity is formed in the lower valve cover, an oil unloading cavity is formed in the side wall of the main oil cavity, a main valve core is connected in the main oil cavity in a sliding mode, a damping hole is formed in the main valve core, an inner flow hole is formed in the center of the outer wall of the bottom of the main valve core, a main valve spring is arranged in the top of the upper valve cover, a side flow hole is formed in the outer wall of the bottom of the upper valve cover, and an oil return hole is formed in the center of the outer wall of the bottom of the upper valve cover. The oil in the lower oil cavity is adopted to push up the main valve core, so that the positions of the main valve core and the oil unloading cavity are changed, and the oil enters the oil unloading cavity to be decompressed, and the hydraulic oil pressure relief valve has the advantages of simple and complex structure, convenience in control and reliability in use, and is beneficial to use of people.

Description

Pilot hydraulic valve

Technical Field

The utility model relates to the technical field of hydraulic valves, in particular to a pilot hydraulic valve.

Background

The hydraulic valve is an automatic element operated by pressure oil, is controlled by the pressure oil of a distribution valve, is usually combined with an electromagnetic distribution valve for use, and can be used for remotely controlling the connection and disconnection of oil, gas and water pipeline systems of hydropower stations. It is commonly used for oil circuits of clamping, controlling, lubricating and the like. The direct-acting type and the pilot type are divided into a multi-purpose pilot type. The pilot overflow valve is used on the main valve core and the pressure measuring surface of the pilot valve core and consists of a pilot and a main valve.

But present overflow valve has some drawbacks when using, and often the structure is comparatively complicated, and control is inconvenient, uses unreliably, is unfavorable for people's use. Therefore, it is desirable to design a pilot hydraulic valve to solve the above problems.

Disclosure of Invention

The utility model aims to solve the defects of complex structure, inconvenient control and unreliable use in the prior art, and provides a pilot hydraulic valve.

In order to achieve the purpose, the utility model adopts the following technical scheme: a pilot hydraulic valve comprises an upper valve cover, wherein a lower valve cover is arranged on the outer wall of the bottom of the upper valve cover, an oil inlet is formed in the outer wall of one side of the lower valve cover, an oil outlet is formed in the outer wall of the other side of the lower valve cover, a lower oil cavity is formed in the outer wall of the bottom of the lower valve cover, a main oil cavity is formed in the lower valve cover, an oil unloading cavity is formed in the side wall of the main oil cavity, a main valve core is slidably connected in the main oil cavity, a damping hole is formed in the main valve core, an inner flow hole is formed in the center of the outer wall of the bottom of the main valve core, a main valve spring is arranged in the top end of the upper valve cover, a side flow hole is formed in the outer wall of the bottom of the upper valve cover, an oil return hole is formed in the center of the outer wall of the bottom of the upper valve cover, a side oil cavity is formed in the outer wall of one side of the upper valve cover, and a pilot oil cavity is formed in the outer wall of the other side of the upper valve cover, and a pilot valve core is arranged in the pilot oil chamber.

The key concept of the technical scheme is as follows: the oil in the lower oil cavity is adopted to push up the main valve core, so that the positions of the main valve core and the oil unloading cavity are changed, and the oil enters the oil unloading cavity to be decompressed, and the hydraulic oil pressure relief valve has the advantages of simple and complex structure, convenience in control, reliability in use and benefit for people to use.

Furthermore, the outer wall of the bottom of the main oil chamber is provided with a main valve clack, and the outer wall of one side of the pilot oil chamber is provided with a pilot valve clack.

Furthermore, a lower sealing cover is arranged inside one end of the lower oil cavity, and a side sealing cover is arranged inside one end of the side oil cavity.

Furthermore, an adjusting frame is arranged on the outer wall of one side of the upper valve cover, an adjusting screw is connected to the inner thread of the adjusting frame, and a locking nut is connected to the side wall of the adjusting screw through a bolt.

Furthermore, the inside sliding connection of one end of guide's grease chamber has the ejector pin, the seal cover has been cup jointed to the lateral wall of ejector pin, one side outer wall of seal cover is provided with the pressure regulating spring.

Furthermore, a clamping groove is formed in the outer wall of the top of the lower valve cover, and a sealing ring is arranged inside the clamping groove.

The utility model has the beneficial effects that:

1. through setting up lower oil pocket and oil discharge chamber, oil liquid pushes up main valve core in the lower oil pocket for main valve core and oil discharge chamber position change, and oil gets into and unloads the oil pocket and carries out the pressure release, and simple structure is complicated, and control is convenient, and is reliable in utilization, is favorable to people's use.

2. Through setting up the damping hole, the damping hole has the damping effect, makes the main valve core receive hydraulic pressure inequality in upper and lower two directions, and the main valve core moves up under the effect of pressure differential, opens the valve port, realizes the overflow, and maintains pressure stable basically, eliminates the oil circuit and shakes.

3. Through setting up the seal cover, the seal cover increases the leakproofness between ejector pin and the interior wall of pilot oil chamber, avoids fluid from the well outflow, and leads to the unable effective increase of fluid in the lower oil pocket, causes the influence to pilot hydraulic valve's performance.

4. Through setting up the sealing washer, the sealing washer hugs closely at the bottom outer wall of last valve gap, and the leakproofness between valve gap and the last valve gap under the sealing washer increases avoids the air to enter into main grease chamber from the gap between the two in, causes fluid pollution, influences the performance of guide's hydraulic valve.

Drawings

FIG. 1 is a schematic diagram of a pilot hydraulic valve according to the present invention;

FIG. 2 is a schematic diagram of a front structure of a pilot hydraulic valve according to the present invention;

fig. 3 is an enlarged schematic diagram of a pilot hydraulic valve a according to the present invention.

In the figure: the hydraulic control valve comprises an upper valve cover 1, a lower valve cover 2, an oil inlet 3, a main oil chamber 4, a main valve core 5, a damping hole 6, an internal flow hole 7, a main valve spring 8, a lower oil chamber 9, a side flow hole 10, a side oil chamber 11, an oil return hole 12, a pilot valve core 13, an oil unloading chamber 14, an oil outlet 15, a main valve flap 16, a pilot valve flap 17, a lower sealing cover 18, a side sealing cover 19, an adjusting frame 20, an adjusting screw 21, a locking nut 22, a push rod 23, a sealing sleeve 24, a pressure adjusting spring 25, a clamping groove 26, a sealing ring 27 and a pilot oil chamber 28.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, a pilot hydraulic valve includes an upper valve cover 1, a lower valve cover 2 is disposed on an outer wall of a bottom of the upper valve cover 1, an oil inlet 3 is disposed on an outer wall of one side of the lower valve cover 2, oil enters a main oil chamber 4 through the oil inlet 3, an oil outlet 15 is disposed on an outer wall of the other side of the lower valve cover 2, the oil in a relief chamber 14 is discharged through the oil outlet 15, a lower oil chamber 9 is disposed on an outer wall of a bottom of the lower valve cover 2, when an oil pressure of the oil in the lower oil chamber 9 is greater than a pressure of a main valve spring 8, the oil pushes a main valve core 5 upward, the main oil chamber 4 is disposed inside the lower valve cover 2, a relief chamber 14 is disposed on a side wall of the main oil chamber 4, when the main valve core 5 is pushed upward by the oil in the lower oil chamber 9, positions of the main valve core 5 and the relief chamber 14 change, the main valve core 5 does not close the relief chamber 14, the relief chamber 14 is opened, the main oil of the main oil chamber 4 enters the relief chamber 14, the main oil chamber 4 is decompressed, a main valve core 5 is connected inside the main oil chamber 4 in a sliding manner, the main valve core 5 is matched with the main valve core 5 to seal a lower oil chamber 9 and seal an oil unloading chamber 14 under the action of a main valve spring 8, a damping hole 6 is arranged inside the main valve core 5, the damping hole 6 has a damping effect, so that hydraulic forces in the upper direction and the lower direction, which are applied to the main valve core 5, are unequal, the main valve core 5 moves upwards under the action of differential pressure to open a valve port to realize overflow, maintain basically stable pressure and eliminate oil circuit oscillation, an inner flow hole 7 is arranged at the center of the outer wall of the bottom of the main valve core 5, oil above the main valve core 5 flows into the lower oil chamber 9 through the inner flow hole 7, the main valve spring 8 is arranged inside the top end of the upper valve cover 1, the main valve spring 8 is extruded to generate a main valve spring force to push the main valve core 5 to tightly close a main valve flap 16, and a side flow hole 10 is arranged on the outer wall of the bottom of the upper valve cover 1, oil in the main oil chamber 4 enters a side oil chamber 11 through a side flow hole 10, an oil return hole 12 is formed in the center of the outer wall of the bottom of the upper valve cover 1, oil in the pilot oil chamber 28 enters the upper portion of the main valve core 5 through the oil return hole 12, a side oil chamber 11 is formed in the outer wall of one side of the upper valve cover 1, when the oil pressure of the oil in the side oil chamber 11, namely the system pressure, is larger than the pilot valve opening pressure, namely the pressure of the pressure regulating spring 25, the pilot valve core 13 is pushed leftwards by the oil in the side oil chamber 11, the oil enters the pilot oil chamber 28, the pilot oil chamber 28 is formed in the outer wall of the other side of the upper valve cover 1, a pilot valve core 13 is arranged inside the pilot oil chamber 28, and the pilot valve core 13 is matched with the pilot valve clack 17 to seal the side oil chamber 11 under the action of the pressure regulating spring 25 of the pilot valve core 13.

As apparent from the above description, the present invention has the following advantageous effects: the oil in the lower oil cavity 9 is adopted to push up the main valve core 5, so that the positions of the main valve core 5 and the oil unloading cavity 14 are changed, and the oil enters the oil unloading cavity 14 to be decompressed, and the hydraulic oil pressure relief valve has the advantages of simple and complex structure, convenience in control and reliability in use, and is beneficial to use of people.

Further, the outer wall of the bottom of the main oil chamber 4 is provided with a main valve flap 16, the main valve flap 16 is matched with the main valve core 5 to seal the lower oil chamber 9, the outer wall of one side of the pilot oil chamber 28 is provided with a pilot valve flap 17, and the pilot valve flap 17 is matched with the pilot valve core 13 to seal the side oil chamber 11.

Further, a lower cover 18 is arranged inside one end of the lower oil chamber 9, the lower cover 18 is used for sealing the lower oil chamber 9, a side cover 19 is arranged inside one end of the side oil chamber 11, and the side cover 19 is used for sealing the side oil chamber 11.

Furthermore, an adjusting frame 20 is arranged on the outer wall of one side of the upper valve cover 1, the adjusting frame 20 facilitates installation of an adjusting screw 21, the adjusting screw 21 is connected to the inner thread of the adjusting frame 20, one end of the adjusting screw 21 abuts against the side wall of the ejector rod 23, a user rotates the adjusting screw 21 to adjust the position of the ejector rod 23 and adjust the overflow pressure, a locking nut 22 is connected to the side wall of the adjusting screw 21 through a bolt, the locking nut 22 is used for locking the position of the adjusting screw 21, and the phenomena that the adjusting screw 21 is reversed and the like are avoided, so that the overflow pressure is changed.

Further, the one end internal sliding connection of guide's grease chamber 28 has ejector pin 23, ejector pin 23 is used for extrudeing pressure regulating spring 25, seal cover 24 has been cup jointed to the lateral wall of ejector pin 23, seal cover 24 increases the seal between ejector pin 23 and the 28 inner walls of guide's grease chamber, avoid fluid outflow from the centre, and lead to the unable increase of fluid in the lower oil pocket 9, influence guide's hydraulic valve's performance, one side outer wall of seal cover 24 is provided with pressure regulating spring 25, pressure regulating spring 25 receives the extrusion, promote guide's case 13 and plug up guide's valve clack 17, adjust overflow pressure through adjustment pressure regulating spring 25.

Further, draw-in groove 26 has been seted up to the top outer wall of lower valve gap 2, draw-in groove 26 is used for joint sealing washer 27, and the inside of draw-in groove 26 is provided with sealing washer 27, and sealing washer 27 joint is in draw-in groove 26, and sealing washer 27 hugs closely the bottom outer wall at upper valve gap 1, and sealing washer 27 increases the seal between lower valve gap 2 and the upper valve gap 1, avoids the air to get into in the main oil chamber 4 from the gap between the two, causes fluid pollution, influences the performance of guide's hydraulic valve.

By adopting the sealing ring 27 and the clamping groove 26, the sealing ring 27 is clamped in the clamping groove 26, the sealing ring 27 increases the airtightness between the lower valve cover 2 and the upper valve cover 1, and the phenomenon that air enters the main oil chamber 4 from a gap between the lower valve cover and the upper valve cover to cause oil liquid pollution and influence the performance of the pilot hydraulic valve is avoided.

Some preferred embodiments or application examples are listed below to help those skilled in the art to better understand the technical content of the present invention and the technical contribution of the present invention with respect to the prior art:

example 1

A pilot hydraulic valve comprises an upper valve cover 1, a lower valve cover 2 is arranged on the outer wall of the bottom of the upper valve cover 1, an oil inlet 3 is formed in the outer wall of one side of the lower valve cover 2, oil enters a main oil chamber 4 through the oil inlet 3, an oil outlet 15 is formed in the outer wall of the other side of the lower valve cover 2, the oil is discharged through the oil outlet 15, a lower oil chamber 9 is formed in the outer wall of the bottom of the lower valve cover 2, when the oil pressure of the oil in the lower oil chamber 9 is larger than the pressure of a main valve spring 8, the oil pushes a main valve core 5 upwards, a main oil chamber 4 is formed in the lower valve cover 2, an oil discharging chamber 14 is formed in the side wall of the main oil chamber 4, when the main valve core 5 is pushed upwards by the oil in the lower oil chamber 9, the positions of the main valve core 5 and the oil discharging chamber 14 are changed, the main valve core 5 does not seal the oil discharging chamber 14, the oil discharging chamber 14 is opened, the oil in the main oil chamber 4 enters the oil discharging chamber 14 to discharge, the main oil chamber 4 is decompressed, the inner portion of the main oil chamber 4 is connected with the core 5 in a sliding manner, the main valve core 5 is matched with the main valve core 5 to seal the lower oil cavity 9 and seal the oil unloading cavity 14 under the action of the main valve spring 8, a damping hole 6 is arranged inside the main valve core 5, the damping hole 6 has a damping effect, so that hydraulic forces in the upper direction and the lower direction received by the main valve core 5 are unequal, the main valve core 5 moves upwards under the action of differential pressure to open a valve port to realize overflow, maintain the pressure basically stable and eliminate oil circuit oscillation, an inner flow hole 7 is arranged at the center of the outer wall of the bottom of the main valve core 5, oil above the main valve core 5 flows into the lower oil cavity 9 through the inner flow hole 7, the main valve spring 8 is arranged inside the top end of the upper valve cover 1, the main valve spring 8 is extruded to generate resilience force to push a tight closing valve 16 of the main valve core 5, a side flow hole 10 is arranged on the outer wall of the bottom of the upper valve cover 1, the oil in the main oil chamber 4 enters the side oil cavity 11 through the side flow hole 10, an oil return hole 12 is arranged at the center of the outer wall of the bottom of the upper valve cover 1, oil in the pilot oil chamber 28 enters the upper portion of the main valve element 5 through the oil return hole 12, a side oil chamber 11 is formed in the outer wall of one side of the upper valve cover 1, when the oil pressure of the oil in the side oil chamber 11, namely the system pressure, is greater than the pilot valve opening pressure, namely the pressure of the pressure regulating spring 25, the oil in the side oil chamber 11 pushes the pilot valve element 13 leftwards, the oil enters the pilot oil chamber 28, the pilot oil chamber 28 is formed in the outer wall of the other side of the upper valve cover 1, the pilot valve element 13 is arranged inside the pilot oil chamber 28, and the pilot oil chamber 11 is sealed by matching with the pilot valve clack 17 under the action of the pressure regulating spring 25 of the pilot valve element 13.

The outer wall of the bottom of the main oil chamber 4 is provided with a main valve flap 16, the main valve flap 16 is matched with the main valve core 5 to seal the lower oil chamber 9, the outer wall of one side of the pilot oil chamber 28 is provided with a pilot valve flap 17, and the pilot valve flap 17 is matched with the pilot valve core 13 to seal the side oil chamber 11; a lower sealing cover 18 is arranged inside one end of the lower oil cavity 9, the lower sealing cover 18 is used for sealing the lower oil cavity 9, a side sealing cover 19 is arranged inside one end of the side oil cavity 11, and the side sealing cover 19 is used for sealing the side oil cavity 11; an adjusting frame 20 is arranged on the outer wall of one side of the upper valve cover 1, the adjusting frame 20 facilitates installation of an adjusting screw 21, the adjusting screw 21 is connected to the inner thread of the adjusting frame 20, one end of the adjusting screw 21 abuts against the side wall of the ejector rod 23, a user rotates the adjusting screw 21 to adjust the position of the ejector rod 23 and is used for adjusting overflow pressure, a locking nut 22 is connected to the side wall of the adjusting screw 21 through a bolt, and the locking nut 22 is used for locking the position of the adjusting screw 21 and avoiding the phenomena of inversion and the like of the adjusting screw 21 so that the overflow pressure is changed; a top rod 23 is connected to one end of the pilot oil chamber 28 in a sliding mode, the top rod 23 is used for extruding a pressure regulating spring 25, a sealing sleeve 24 is sleeved on the side wall of the top rod 23, the sealing sleeve 24 increases the tightness between the top rod 23 and the inner wall of the pilot oil chamber 28, the phenomenon that oil flows out of the sealing sleeve to cause that the oil in the lower oil chamber 9 cannot be increased and the performance of the pilot hydraulic valve is affected is avoided, the pressure regulating spring 25 is arranged on the outer wall of one side of the sealing sleeve 24, the pressure regulating spring 25 is extruded to push the pilot valve core 13 to plug the pilot valve clack 17, and the overflow pressure is adjusted by adjusting the pressure regulating spring 25; the draw-in groove 26 has been seted up to the top outer wall of lower valve gap 2, draw-in groove 26 is used for joint sealing washer 27, and the inside of draw-in groove 26 is provided with sealing washer 27, and sealing washer 27 joint is in draw-in groove 26, and sealing washer 27 hugs closely in the bottom outer wall of last valve gap 1, and sealing washer 27 increases the seal between lower valve gap 2 and the last valve gap 1, avoids the air to get into in the main oil chamber 4 from the gap between the two, causes fluid pollution, influences the performance of pilot hydraulic valve.

The working principle is as follows: when the hydraulic pressure relief valve works, oil enters a main oil chamber 4 through an oil inlet 3, the main oil chamber 4 is filled with the oil through a damping hole 6, the oil in the main oil chamber 4 enters a side oil chamber 11 through a side flow hole 10, when the oil pressure of the oil in the side oil chamber 11, namely the system pressure, is greater than the pilot valve opening pressure, namely the pressure of a pressure regulating spring 25, the oil in the side oil chamber 11 pushes a pilot valve core 13 leftwards, so that the pilot valve core 13 is separated from a pilot valve clack 17, the oil enters a pilot oil chamber 28, the oil in the pilot oil chamber 28 enters the upper part of the main valve core 5 through an oil return hole 12, the oil above the main valve core 5 flows into a lower oil chamber 9 through an inner flow hole 7, when the main valve core 5 is pushed upwards by the oil in the lower oil chamber 9, the main valve core 5 is separated from the main valve clack 16, the positions of the main valve core 5 and an oil relief chamber 14 are changed, the main valve core 5 does not close the oil relief chamber 14, the oil relief chamber 14 is opened, and the main oil chamber 4 is relieved, the oil in the oil relief cavity 14 is discharged through the oil outlet 15, and simultaneously, the user can rotate the adjusting screw 21 to adjust the position of the ejector rod 23, the ejector rod 23 extrudes the pressure regulating spring 25 to adjust the overflow pressure, and the user can rotate the locking nut 22 to fix the position of the adjusting screw 21.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The pilot hydraulic valve comprises an upper valve cover (1) and is characterized in that a lower valve cover (2) is arranged on the outer wall of the bottom of the upper valve cover (1), an oil inlet (3) is formed in the outer wall of one side of the lower valve cover (2), an oil outlet (15) is formed in the outer wall of the other side of the lower valve cover (2), a lower oil cavity (9) is formed in the outer wall of the bottom of the lower valve cover (2), a main oil cavity (4) is formed in the lower valve cover (2), an oil unloading cavity (14) is formed in the side wall of the main oil cavity (4), a main valve core (5) is connected to the inner portion of the main oil cavity (4) in a sliding mode, a damping hole (6) is formed in the inner portion of the main valve core (5), an inner flow hole (7) is formed in the center of the outer wall of the bottom of the main valve core (5), and a main valve spring (8) is arranged in the top end of the upper valve cover (1), side discharge opening (10) have been seted up to the bottom outer wall of upper valve gap (1), oil gallery (12) have been seted up to the bottom outer wall center department of upper valve gap (1), side oil pocket (11) have been seted up to one side outer wall of upper valve gap (1), pilot oil chamber (28) have been seted up to the opposite side outer wall of upper valve gap (1), the inside of pilot oil chamber (28) is provided with pilot valve core (13).

2. A pilot hydraulic valve according to claim 1, characterized in that the bottom outer wall of the main oil chamber (4) is provided with a main valve flap (16), and the side outer wall of the pilot oil chamber (28) is provided with a pilot valve flap (17).

3. A pilot hydraulic valve according to claim 1, characterised in that a lower cover (18) is provided inside one end of the lower chamber (9) and a side cover (19) is provided inside one end of the side chamber (11).

4. The pilot hydraulic valve according to claim 1, characterized in that an adjusting frame (20) is arranged on the outer wall of one side of the upper valve cover (1), an adjusting screw (21) is connected to the inner thread of the adjusting frame (20), and a locking nut (22) is bolted to the side wall of the adjusting screw (21).

5. The pilot hydraulic valve according to claim 1, wherein a push rod (23) is slidably connected to one end of the pilot oil chamber (28), a sealing sleeve (24) is sleeved on a side wall of the push rod (23), and a pressure regulating spring (25) is arranged on an outer wall of one side of the sealing sleeve (24).

6. The pilot hydraulic valve as claimed in claim 1, wherein a clamping groove (26) is formed in the outer wall of the top of the lower valve cover (2), and a sealing ring (27) is arranged inside the clamping groove (26).