CN108869430B - Small-size distribution valve - Google Patents

Abstract

The invention discloses a small-sized distribution valve, which comprises a valve body, wherein an oil inlet is arranged at the upper end of the valve body, an oil return hole is arranged at the lower end of the valve body, a valve core hole is arranged in the middle of the valve body, a first O-shaped ring is arranged at the right end inside the valve core hole, a connecting screw is arranged at the upper end on the left side of the valve body through threads, one end, far away from the valve body, of the connecting screw is connected with a handle through a pin shaft, a first spring is arranged between a pair of spring retaining sheets, a spring seat is arranged at the right end of the valve body through an inner hexagon screw, the center of the spring seat is sleeved at one end of a valve rod, a second O-shaped ring is arranged at the position, contacted with the spring seat, of the valve body, a safety valve seat is arranged beside, the central position of the handle is connected with the left end of the valve rod through a pin shaft. The reasonable layout of the structure of the invention can reduce the volume of the distributing valve.

Description

a small distribution valve

technical field

The invention relates to the technical field of hydraulic valves, in particular to a small distribution valve.

Background technique

Hydraulic transmission has many outstanding advantages, so it is widely used, such as plastic processing machinery, press machinery, machine tools, etc. for general industry; construction machinery, construction machinery, agricultural machinery, automobiles, etc. in mobile machinery; Metallurgical machinery, hoisting devices, roll adjustment devices, etc.; flood gates and dam devices for civil and hydraulic engineering, river bed lifting devices, bridge control mechanisms, etc.; power plant turbine speed control devices, nuclear power plants, etc.; deck hoisting machinery for ships (winches), bow doors, bulkhead valves, stern thrusters, etc.; giant antenna control devices for special technologies, measuring buoys, lifting and rotating stages, etc.; artillery control devices for military industry, ship anti-rolling devices, aircraft simulation, The retractable device and rudder control device of aircraft landing gear, etc.

Hydraulic control elements (ie, various hydraulic valves) control and regulate the pressure, flow and direction of liquids in hydraulic systems. According to the different control functions, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. Pressure control valve includes relief valve (safety valve), pressure reducing valve, sequence valve, pressure relay, etc.; flow control valve includes throttle valve, regulating valve, diverter collecting valve, etc.; directional control valve includes check valve, hydraulic control valve, etc. Check valve, shuttle valve, reversing valve, etc. According to different control methods, hydraulic valves can be divided into on-off control valves, fixed value control valves and proportional control valves.

The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. It is a valve that realizes the communication, cut-off and reversal of hydraulic oil flow, as well as pressure unloading and sequential action control. The reversing valve can be divided into manual reversing valve, electromagnetic reversing valve, electro-hydraulic reversing valve, etc. The reversing valve has multi-directional adjustable channels, which can change the fluid flow direction in time. When working, the drive shaft is rotated by the drive transmission mechanism outside the valve, the rocker arm is driven, and the valve plate is activated, so that the working fluid sometimes leads from the left inlet to the lower outlet of the valve, and sometimes changes from the right inlet to the lower outlet, realizing the cycle. The purpose of changing the flow direction.

The hydraulic distribution valve is an integral one-way reversing valve, which is widely used in the hydraulic control system of construction machinery and agricultural machinery.

The existing hydraulic distribution valve has a complex structure and occupies space for the arrangement of the oil circuit, which is not economical and practical.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a small distribution valve. In order to solve the problems of the complex structure of the existing hydraulic distribution valve proposed in the technical background, the space occupied by the oil circuit arrangement, and the insufficient economical and practicality.

In order to achieve the above purpose, the present invention provides the following technical solutions: a small distribution valve of the present invention includes a valve body, an oil inlet is arranged at the upper end of the valve body, and an oil return hole is arranged at the lower end of the valve body, and the A valve core hole is arranged in the middle of the valve body, a first O-ring is installed on the inner right end of the valve core hole, a connecting screw is installed on the upper left end of the valve body through a thread, and the end of the connecting screw away from the valve body passes through The pin shaft is connected with a handle, the valve core hole is fitted with a valve stem, and the matching clearance between the valve core hole and the valve stem is 0.01-0.015mm. During assembly, the processing burrs of the valve stem must be removed and cleaned. Assemble; the right end of the valve body is provided with a cylindrical groove, the end of the valve rod disposed inside the cylindrical groove is installed with a pair of spring blocking sheets, the left spring blocking sheet is in contact with the bottom surface of the cylindrical groove, and a pair of the spring blocking sheets A first spring is arranged between the plates, a spring seat is installed on the right end of the valve body through a hexagon socket head screw, the center of the spring seat is sleeved on one end of the valve stem, and a second spring seat is provided at the position where the valve body contacts the spring seat. O-ring, the lower end of the valve body is arranged beside the oil return hole and a safety valve seat is installed, the inner center of the safety valve seat is installed with a gasket and a second spring, the gasket is arranged on the safety valve At the bottom of the center of the seat, one end of the second spring is in contact with the end surface of the gasket, the other end of the second spring is sleeved with one end of the cone valve, the upper end of the safety valve seat is installed with a cone valve seat inside the valve body, and the valve body is connected to the valve body. The cone valve seat is threaded, the cone valve is sealed with the oil passage hole provided in the center of the cone valve seat, and the position of the valve core hole is located at the right end of the oil inlet. An oil passage groove is provided, and the oil passage groove communicates with The working port, the central position of the handle is connected with the left end of the valve stem through a pin shaft.

Preferably, a locking nut is threadedly connected to the connecting screw close to the outside of the valve body. The lock nut is used to tighten the valve body and the connecting screw together to prevent the connecting screw from falling off during the push-pull process of the handle.

Preferably, the valve core hole and the cylindrical groove are arranged concentrically. The spool bore has a roughness grade of 0.8 and the stem has a surface roughness of 0.4.

Preferably, a combined gasket is provided at the contact portion of the valve body and the safety valve seat. The combined gasket is a standard part with a ring of rubber on the inner ring to prevent oil leakage at the connection between the valve body and the safety valve seat.

Preferably, an oil passage hole is provided at the axial center position of the cone valve seat, and the oil passage hole communicates with the oil inlet. When the pressure of the oil is greater than the elastic force of the second spring, the hydraulic oil opens the poppet valve, and the oil flows out from the oil return hole, lowering the pressure of the whole system and reaching a balance with the elastic force of the second spring, the poppet valve and the The oil hole is in contact and the oil circuit is cut off.

Preferably, the oil passage provided in the gap between the safety valve seat and the cone valve seat communicates with the oil inlet and the oil return hole. The oil circuit can be opened or closed by pushing and pulling the valve stem.

Compared with the prior art, the beneficial effect of the present invention is: by arranging an oil inlet at the upper end of the valve body, an oil return hole is arranged at the lower end of the valve body, a valve core hole is arranged in the middle of the valve body, and the inner right end of the valve core hole is arranged A first O-ring is installed, the right end of the valve body is provided with a cylindrical groove, and one end of the valve stem is installed inside the cylindrical groove with a pair of spring blocking sheets, the left spring blocking sheet is in contact with the bottom surface of the cylindrical groove, and a pair of spring blocking sheets A first spring is arranged between them, and a spring seat is installed on the right end of the valve body through a hexagon socket screw. A gasket and a second spring are installed in the inner center of the safety valve seat. The gasket is arranged at the bottom of the center of the safety valve seat. One end of the second spring is in contact with the end face of the gasket. A cone valve seat is installed inside the valve body at the upper end of the valve body, the cone valve is sealed with the oil passage hole set in the center of the cone valve seat, and the position of the valve core hole is located at the right end of the oil inlet port. Through the provision of the first O-ring, the second O-ring and the combined gasket, the valve body can be effectively sealed to prevent the hydraulic oil from leaking out. The rational layout of the structure of the present invention can reduce the volume of the distribution valve, making the distribution valve more convenient and practical.

Description of drawings

1 is a schematic structural diagram of a small distribution valve of the present invention;

2 is a schematic diagram of the overall structure of a small distribution valve of the present invention;

3 is a schematic structural diagram of a safety valve seat of a small distribution valve of the present invention;

FIG. 4 is a schematic structural diagram of a cone valve seat of a small distribution valve of the present invention.

In the figure: valve body 1, oil inlet 101, oil return hole 102, valve core hole 103, cylindrical groove 104, oil passage 105, working port 106, first O-ring 2, lock nut 3, handle 4, connection Screw 5, poppet valve seat 6, oil hole 601, combined gasket 7, poppet valve 8, second spring 9, safety valve seat 10, gasket 11, first spring 12, socket head cap screw 13, spring seat 14, valve Rod 15 , second O-ring 16 , spring catch 17 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1-4, a small distribution valve includes a valve body 1, the upper end of the valve body 1 is provided with an oil inlet 101, the lower end of the valve body 1 is provided with an oil return hole 102, the valve body 1 A valve core hole 103 is arranged in the middle of the body 1, the inner right end of the valve core hole 103 is installed with a first O-ring 2, and the left upper end of the valve body 1 is threadedly installed with a connecting screw 5. The connecting screw 5 The end away from the valve body 1 is connected with the handle 4 through the pin shaft. The valve core hole 103 has a valve stem 15 in clearance fit. The rod 15 slides without jamming inside the valve core hole 103; the right end of the valve body 1 is provided with a cylindrical groove 104, and one end of the valve rod 15 disposed inside the cylindrical groove 104 is installed with a pair of spring blocking plates 17, and the left The spring blocking piece 17 is in contact with the bottom surface of the cylindrical groove 104 , a first spring 12 is arranged between a pair of the spring blocking pieces 17 , and a spring seat 14 is installed on the right end of the valve body 1 through a hexagon socket head screw 13 . The spring seat The center of 14 is sleeved on one end of the valve stem 15, a second O-ring 16 is provided at the position where the valve body 1 is in contact with the spring seat 14, and the lower end of the valve body 1 is provided next to the oil return hole 102. There is a safety valve seat 10, a gasket 11 and a second spring 9 are installed in the inner center of the safety valve seat 10, the gasket 11 is arranged at the bottom of the center of the safety valve seat 10, and one end of the second spring 9 is connected to the gasket. The end faces of the sheet 11 are in contact with each other, the other end of the second spring 9 is sleeved with one end of the cone valve 8, the upper end of the safety valve seat 10 is installed with a cone valve seat 6 inside the valve body 1, and the valve body 1 and the cone valve seat 6 are threaded Connection, the cone valve 8 is sealed with the oil passage hole 601 provided in the center of the cone valve seat 6, and the position of the valve core hole 103 is located at the right end of the oil inlet 101. An oil passage groove 105 is provided, and the oil passage groove 105 communicates with the working port 106, and the central position of the handle 4 is connected with the left end of the valve stem 15 through a pin. The connecting screw 5 is connected with a locking nut 3 close to the external thread of the valve body 1 . The valve core hole 103 and the cylindrical groove 104 are arranged concentrically. A combined gasket 7 is provided at the contact position of the valve body 1 and the safety valve seat 10 . The cone valve seat 6 is provided with an oil passage hole 601 at the axial center position, and the oil passage hole 601 communicates with the oil inlet 101 . The oil passage provided in the gap between the safety valve seat 10 and the cone valve seat 6 communicates with the oil inlet 101 and the oil return hole 102 .

Specifically, when using, first clean all parts of the device with ultrasonic cleaning agent, then insert the valve stem 15 into the valve core hole 103, and push and pull the valve stem 15 back and forth to ensure that the movement is not stuck. Then pull out the valve stem 15 and assemble it with the first spring 12 and the spring flap 17, then install the spring seat 14 on the valve body 1, install the connecting screw 5 on the valve body 1, and install the handle 4 on the connecting On the screw 5 and the valve stem 15, install the poppet valve seat 6 inside the valve body 1, install the second spring 9 and the gasket 11 inside the safety valve seat 11, and install the poppet valve 8 in the position of the poppet valve seat 6 , screw the safety valve seat 11 on the valve body 1. After the assembly is completed, connect the oil inlet 101 to the oil pipe, the oil return hole 102 to the oil pipe, and the work port 106 to the work pipe; then turn on the hydraulic pump, when the pressure of the oil is greater than the elastic force of the second spring 9, The hydraulic oil opens the poppet valve 8, and the oil flows out from the oil return hole 102, reducing the pressure of the whole system. When the elastic force of the second spring 9 is balanced, the poppet valve 8 contacts the oil passage hole 601 and cuts off the oil circuit. By pushing the handle 4 and pulling the valve stem 15, the oil circuit between the oil inlet 101 and the working port 106 can be connected and closed, and the pressure oil can be supplied to the working system to realize the function of one-way distribution of hydraulic oil. One or more gaskets 11 can be provided to adjust the compression amount of the second spring 9 to adjust the opening pressure of the poppet valve 8. The greater the compression amount of the second spring 9, the greater the opening pressure of the poppet valve 8, and vice versa. Both the first O-ring 2 and the second O-ring 16 play a role of sealing to prevent hydraulic oil from leaking. The rational layout of the structure of the present invention can reduce the volume of the distribution valve, making the distribution valve more convenient and practical.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (1)

1. A small distribution valve, comprising a valve body (1), characterized in that an oil inlet (101) is arranged at the upper end of the valve body (1), and an oil return is arranged at the lower end of the valve body (1) A hole (102), a valve core hole (103) is arranged in the middle of the valve body (1), a first O-ring (2) is installed at the inner right end of the valve core hole (103), and the valve body (1) A connecting screw (5) is installed on the left upper end of the ) through the thread, and the end of the connecting screw (5) away from the valve body (1) is connected with a handle (4) through a pin shaft, and there is a gap in the valve core hole (103). A valve stem (15) is matched with a cylindrical groove (104) at the right end of the valve body (1), and a pair of spring blocking plates (17) are installed at one end of the valve stem (15) arranged inside the cylindrical groove (104). ), the left spring blocking piece (17) is in contact with the bottom surface of the cylindrical groove (104), a first spring (12) is arranged between a pair of the spring blocking pieces (17), and the right end of the valve body (1) passes through The hexagon socket head cap screw (13) is installed with a spring seat (14), the center of the spring seat (14) is sleeved on one end of the valve stem (15), and the lower end of the valve body (1) is arranged in the oil return hole (102) A safety valve seat (10) is installed next to the safety valve seat (10), a gasket (11) and a second spring (9) are installed in the inner center of the safety valve seat (10), and the gasket (11) is arranged on the safety valve The center bottom of the seat (10), one end of the second spring (9) is in contact with the end face of the gasket (11), the other end of the second spring (9) is sleeved with one end of the cone valve (8), the safety valve seat The upper end of (10) is provided with a cone valve seat (6) inside the valve body (1). The position of the valve core hole (103) is located at the right end of the oil inlet (101), and an oil passage (105) is provided, and the oil passage (105) communicates with the working port (106), and the central position of the handle (4) The left end of the valve stem (15) is connected by a pin, the connecting screw (5) is connected with a lock nut (3) close to the outer thread of the valve body (1), the valve core hole (103) and the cylinder The grooves (104) are concentrically arranged, the position where the valve body (1) and the safety valve seat (10) are in contact is provided with a combined gasket (7), and the cone valve seat (6) is provided with a through hole at the axial center position. Oil hole (601), said oil passage hole (601) and oil inlet (101) pass through, oil passage and oil inlet provided in the gap between said safety valve seat (10) and cone valve seat (6) (101) communicate with the oil return hole (102), and a second O-ring (16) is provided at the position where the valve body (1) contacts the spring seat (14); When in use, first clean all parts of the device with ultrasonic cleaning agent, then insert the valve stem (15) into the valve core hole (103), push and pull the valve stem (15) back and forth to ensure that the movement is not stuck, and then Pull out the valve stem (15) and assemble it with the first spring (12) and the spring retainer (17), then install the spring seat (14) on the valve body (1), and install the connecting screw (5) on the valve On the valve body (1), install the handle (4) on the connecting screw (5) and the valve stem (15), install the cone valve seat (6) inside the valve body (1), install the second spring (9) , The gasket (11) is installed inside the safety valve seat (11), the poppet valve (8) is installed at the position of the poppet valve seat (6), the safety valve seat (11) is screwed on the valve body (1), and the assembly is completed. After completion, connect the oil inlet (101) to the oil pipe, the oil return hole (102) to the oil return line, and the work port (106) to connect the work line; then turn on the hydraulic pump, when the pressure of the oil is greater than that of the second spring ( 9), when the hydraulic oil opens the cone valve (8), the oil flows out from the oil return hole (102), reducing the pressure of the whole system, and when it reaches the balance with the elastic force of the second spring (9), the cone The valve (8) is in contact with the oil passage hole (601) to cut off the oil circuit. By pushing the handle (4) and pulling the valve stem (15), the connection between the oil inlet (101) and the working port (106) can be realized. The oil circuit is connected and closed to supply pressure oil to the working system to realize the function of distributing hydraulic oil in a single channel. One or more gaskets (11) can be set to adjust the compression amount of the second spring (9) to adjust the poppet valve ( 8), the greater the compression of the second spring (9), the greater the opening pressure of the poppet valve (8), and vice versa, the first O-ring (2) and the second O-ring (16) Both act as seals to prevent hydraulic oil from leaking.

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