CN104344018A - End face seal rotary valve - Google Patents

Abstract

An end-face-sealed rotary valve belongs to a reversing valve, which solves the problems that existing rotary valves cannot compensate for friction and wear during movement and temperature changes, and have relatively large operating force under medium and high pressure. The invention includes a valve body, a bottom cover, a valve core, a thrust ball bearing, a compression screw plug, and a reduction motor. A thrust ball bearing is installed between the valve core and the compression screw plug. One end of the geared motor is embedded in the valve body and fixed by screw connection. The motor shaft of the geared motor cooperates with the valve core. The invention has a compact structure, can ensure reliable reversing of the hydraulic system, has strong adaptability to ambient temperature and working pressure, has good self-compensation for the friction and wear caused by the long-term operation of the kinematic pair, has reliable sealing performance, and has independent valve seats. It is convenient for maintenance and replacement; the overall cylindrical shape is easy to install in various industrial piping systems, and can be used for fluid control in high temperature and high pressure fields such as power plants and oil and gas exploitation.

Description

A kind of end surface sealed rotary valve

Technical field

The invention belongs to selector valve, be specifically related to a kind of end surface sealed rotary valve, the fluid that can be used under the High Temperature High Pressure such as power plant, oil-gas mining field controls.

Background technique

Selector valve conventional at present has ball valve, guiding valve etc.Ball valve relies on valve ball and closely cooperating of valve seat to realize sealing reliably, when standard-sized sheet or full cut-off, the sealing surface of spheroid and valve seat and medium are isolated, when medium passes through, the erosion of valve sealing face can not be caused, safe and reliable, be widely used in the middle of oil, chemical industry, generating, aviation and people's daily life, but ball valve will realize reliable sealing often to be needed to carry out underhand polish to valve ball and valve seat, until spool and valve seat fit like a glove, processing technology difficulty is larger.Guiding valve is simple owing to having structure, commutation switches rapidly, unbalanced force suffered by spool is less, commutation is required to be handled the advantage such as less and is widely used in hydraulic transmission control system, but the seal form of guiding valve is Spielpassung sealing, certain leakage can be there is, be difficult to realize reliable sealing.

Rotary valve refers to and controls the break-make of runner and the selector valve of commutation by rotary spool, and compare with guiding valve with traditional ball valve, it has good technology capability and safe and reliable sealing simultaneously.The spool of current rotary valve and the structure of valve seat are fixed, link up oil groove by design on spool and link up oil circuit, the one braking reversing rotary valve patent application that Zhejiang University proposes, application number 201310709839.8, announce in 2013.12.21, what just adopt is the structure of this fixed cooperation.There is the following deficiency in the rotary valve of this structure:

(1) when, using under mesohigh operating mode, because spool will bear larger hydraulic coupling, the frictional force between spool and valve body can be made to become large, particularly when using the working medium of the such as low viscosity such as water, alcohol, poor lubricity, need larger steering force, greatly exacerbate driving torque;

(2), the sealing surface of spool and valve seat can wear and tear due to long-term relative sliding, causes gap to become large, occurs leaking, even final seal failure;

(3), when operating ambient temperature changes, reasonably cannot compensate the distortion of spool and seat material, steering force can be caused like this to become large, even stuck phenomenon.

Summary of the invention

The invention provides a kind of end surface sealed rotary valve, solving existing rotary valve cannot compensate the fretting wear caused in movement process and temperature variation, in problems such as mesohigh lower-pilot power are larger.

A kind of end surface sealed rotary valve provided by the present invention, comprises valve body, bottom, spool, thrust ball bearing, compression plug screw, reducing motor, it is characterized in that:

Described valve body is cylindrical shape, and its inner chamber is step hole, is followed successively by bottom thread section, seal section, middle part thread section and top section from left to right;

Described bottom is second order Step Shaft, and by large end with small end is integral forms, large end surfaces has outside thread, with described bottom thread section screw-thread fit, small end external diameter and described seal section adapt; Large end end face have symmetry, the return opening be evenly arranged, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port, filler opening, wherein return opening and filler opening are symmetrical about large end end face center, and the first commutation hydraulic fluid port and the second commutation hydraulic fluid port are symmetrical about large end end face center; Small end end face has arc-shaped limit chute, its radian is π/4, and the top of arc-shaped limit chute and end commutate hydraulic fluid port, filler opening respectively in same radial alignment with first; Described return opening, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port are identical with the physical dimension of filler opening, are the second order step hole of axially through bottom, and to be communicated with macropore by aperture and to form, aperture aperture is positioned at the large end end face of bottom; Respectively disc spring and valve seat are housed all successively in the macropore of described return opening, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port and filler opening, described valve seat is the cylindrical body with axial central through hole;

Described spool is second order Step Shaft, and by butt end with taper end is integral forms, butt end external diameter and described seal section adapt; Butt end end face has symmetry, the oil return aperture be evenly arranged, the first commutation oilhole mouth, the second commutation oilhole mouth, oil-feed aperture, their position hydraulic fluid port, second axial central through hole of valve seat in hydraulic fluid port and filler opening that commutates that commutates with the return opening, first of described bottom is respectively corresponding; Wherein, first commutation oilhole mouth is communicated with by the first V-arrangement oilhole in spool with oil-feed aperture, second commutation oilhole mouth is communicated with by the second V-arrangement oilhole in spool with oil return aperture, and it is in the parallel to an axis plane of symmetry about spool medial axis that described first V-arrangement oilhole and the second V-arrangement oilhole to lay respectively in spool two; Butt end end face is also fixed with position limit pin, and its position is corresponding with the top of described arc-shaped limit chute; Taper end end face center has axial pilot hole, for coordinating with the motor shaft of described reducing motor;

Described compression plug screw is the cylindrical body with axial center hole, and its surface has outside thread, with the middle part thread section screw-thread fit with described valve body;

Described bottom is connected with valve body screw thread, is installed on bottom thread section and the seal section of valve body; Described spool and valve body Spielpassung, be installed on the seal section of valve body, makes position limit pin be positioned at the arc-shaped limit chute of described bottom; Described compression plug screw coordinates with described valve body screw thread, be installed on the middle part thread section of valve body, the taper end of spool is through the axial center hole compressing plug screw, and spool and compress between plug screw thrust ball bearing is housed, can the pretightening force of modulating valve easily by compressing plug screw;

Described reducing motor one end embeds the top section of described valve body and is connected by screw fixing, and the motor shaft of reducing motor coordinates with the taper end pilot hole of described spool.

Described end surface sealed rotary valve, it is further characterized in that:

The little end surfaces of described bottom has bottom annular groove for installing bottom seal ring, and small end is coordinated with described seal section formed static seal by bottom seal ring;

Described valve seat adopts the engineering plastics of high strength to make, conical surface is processed in order to install disc spring bottom it, valve base surface has seat ring connected in star for installing valve seat insert, and valve seat to be coordinated with the macropore of corresponding second order step hole by valve seat insert and forms static seal;

Described spool adopts corrosion resistant alloy processing, and the butt end surface of spool has spool annular groove for installing valve core seal ring, and butt end coordinates to be formed with described seal section by valve core seal ring and seals.

When the motor shaft of described reducing motor coordinates with the taper end pilot hole of described spool, axial clearance is left between bottom motor shaft ends and pilot hole, axial force suffered by spool is all acted on thrust ball bearing, thrust ball bearing bears whole load, reducing motor is not by responsive to axial force, to ensure spool flexibility and reliability motion under high pressure, and reduce surface friction drag reduction driving torque.

Return opening of the present invention, first commutation hydraulic fluid port, second commutation hydraulic fluid port, filler opening 4 hydraulic fluid ports are arranged on the same end face of bottom, on these 4 hydraulic fluid ports independently floating valve seat has been installed, the high strength that floating valve seat adopts also has the engineering plastics of fine self-enrichment, the end face of floating valve seat and the butt end end face precision-fit of spool form plane sealing, after each floating valve seat, butterfly spring is installed, its Main Function for: one is carry out thermal compensation to the thermal expansion that floating valve seat and spool produce because of the change of working environment or working medium temperature, prevent heat expansion stuck and cannot rotate flexibly, two is load certain initial pretightening force to floating valve seat, improves sealing reliability, three is the wearing and tearing caused owing to doing frictional rotation for a long time for compensating spool and floating valve seat, and causes the decline of seal pressure, and finally causes seal failure to be leaked, spool adopts corrosion resistant alloy, and make sealing valve port position realize soft seal and coordinate, seal pressure is little.Spool is processed with two first, second V-arrangement oilholes be arranged symmetrically with, the valve seat of layout corresponding on bottom matches, first commutation hydraulic fluid port and filler opening, the second commutation hydraulic fluid port and return opening are linked up between two, by being arranged on the position limit pin on spool and the arc-shaped limit chute on bottom realizes to the control of spool corner, the spacing angle of the arc-shaped limit chute on bottom is 90 °, reducing motor drives spool positive and negative rotation 90 °, can realize the commutation function of valve.Between spool and compression plug screw, thrust ball bearing is installed, effectively can have reduced friction torque, reduced starting torque, valve also can be rotated flexibly under high-pressure situations.

The present invention adopts 4 groups of independently floating type valve seats, compact structure, can ensure the reliable commutation of hydraulic system, to the strong adaptability of ambient temperature and working pressure, have good self-compensating property to the fretting wear that kinematic pair long-term work brings, sealability is reliable; Independent valve seat convenient for maintaining is changed, and has good technology capability; Overall cylindrical shape can be installed among various industrial piping system easily, and the fluid be applicable in the High Temperature High Pressure harsh and unforgiving environments such as such as power plant, oil, natural gas extraction controls.

Accompanying drawing explanation

Fig. 1 (A) is structural representation of the present invention;

Fig. 1 (B) is the A-A sectional view of Fig. 1 (A);

Fig. 2 is valve body structure schematic diagram;

Fig. 3 (A) is bottom cover structure schematic diagram;

The plan view that Fig. 3 (B) is Fig. 3 (A);

Fig. 4 is valve seat construction schematic diagram;

Fig. 5 (A) is valve core structure schematic diagram;

The plan view that Fig. 5 (B) is Fig. 4 (A).

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in more detail with concrete enforcement.

Shown in as Suo Shi Fig. 1 (A), Fig. 1 (B), the present invention includes valve body 10, bottom 20, spool 50, compress plug screw 70, thrust ball bearing 80, reducing motor 90;

As shown in Figure 2, described valve body 10 is cylindrical shape, and its inner chamber is step hole, is followed successively by bottom thread section 11, seal section 12, middle part thread section 13, top section 14 from left to right, top section has mounting hole 15;

As shown in Fig. 3 (A), Fig. 3 (B), described bottom 20 is second order Step Shaft, and by holding greatly 21 and small end 22 is integral forms, large end 21 surfaces have outside thread, with with described bottom thread section 11 screw-thread fit, small end 22 external diameter and described seal section 12 adapt; Large end 21 end face have symmetry, the return opening 21T be evenly arranged, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B, filler opening 21P, wherein return opening 21T and filler opening 21P is symmetrical about large end end face center, and the first commutation hydraulic fluid port 21A and second commutation hydraulic fluid port 21B is symmetrical about large end end face center; Small end 22 end face has arc-shaped limit chute 22D, its radian is π/4, and the top of arc-shaped limit chute 22D and end commutate hydraulic fluid port 21A, filler opening 21P respectively in same radial alignment with first; Described return opening 21T, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B are identical with the physical dimension of filler opening 21P, are the second order step hole of axially through bottom, and to be communicated with macropore by aperture and to form, aperture aperture is positioned at the large end end face of bottom; Small end 22 surface of described bottom 20 has bottom annular groove 23 for installing bottom seal ring 110, and small end 22 is coordinated with described seal section 12 by bottom seal ring 110 and forms static seal;

As shown in Fig. 1 (A), in the macropore of described return opening 21T, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B and filler opening 21P, disc spring 30 and valve seat 40 are housed respectively all successively; As shown in Figure 4, described valve seat 40 is for having the cylindrical body of axial central through hole 41, the engineering plastics of high strength are adopted to make, conical surface 42 is processed in order to install disc spring 30 bottom it, valve seat 40 surface has seat ring connected in star 43 for installing valve seat insert 120, and valve seat 40 is coordinated with the macropore of corresponding second order step hole by valve seat insert 120 and forms static seal;

As shown in Fig. 5 (A), Fig. 5 (B), described spool 50 is second order Step Shaft, and by butt end 51 with taper end 52 is integral forms, adopt corrosion resistant alloy processing, butt end 51 external diameter and described seal section 12 adapt; Butt end end face has symmetry, the oil return aperture 51T be evenly arranged, the first commutation oilhole mouth 51A, the second commutation oilhole mouth 51B, oil-feed aperture 51P, their position hydraulic fluid port 21A, second axial central through hole 41 of valve seat 40 in hydraulic fluid port 21B and filler opening 21P that commutates that commutates with the return opening 21T, first of described bottom 20 is respectively corresponding; Wherein, first commutation oilhole mouth 51A is communicated with by the first V-arrangement oilhole 53 in spool 50 with oil-feed aperture 51P, second commutation oilhole mouth 51B is communicated with by the second V-arrangement oilhole 54 in spool 50 with oil return aperture 51T, and it is in symmetrical parallel to an axis plane about spool medial axis that described first V-arrangement oilhole 53 and the second V-arrangement oilhole 54 lay respectively at interior two of spool 50; Butt end end face is processed with blind hole 51C in order to mounting limit pin 60, its position is corresponding with the top of described arc-shaped limit chute 22D; Taper end 52 end face center has axial pilot hole 52A, for coordinating with the motor shaft of described reducing motor 13; Described butt end 51 surface has spool annular groove 55 for installing valve core seal ring 100, and butt end 51 coordinates to be formed with described seal section 12 by valve core seal ring 100 and seals.

As shown in Fig. 1 (A), described compression plug screw 70 is for having the cylindrical body of axial center hole 71, and its surface has outside thread, with middle part thread section 13 screw-thread fit with described valve body 1;

As shown in Fig. 1 (A), described bottom 20 is threaded with valve body 10, is installed on bottom thread section 11 and the seal section 12 of valve body 10; Described spool 50 and valve body 10 Spielpassung, be installed on the seal section 12 of valve body 10, make position limit pin 60 be positioned at the arc-shaped limit chute 22D of described bottom 20; Described compression plug screw 70 and described valve body 10 screw-thread fit, be installed on the middle part thread section 13 of valve body 10, the taper end 52 of spool 50 is through the axial center hole 71 compressing plug screw 70, spool 50 and compress between plug screw 70 thrust ball bearing 80 is housed, can the pretightening force of modulating valve easily by compressing plug screw 70;

Described reducing motor 90 one end embeds the top section 14 of described valve body 10 and is connected by screw fixing, and the motor shaft of reducing motor 90 coordinates with the taper end 52 pilot hole 52A of described spool 50.

When the motor shaft of described reducing motor 90 coordinates with the taper end 52 pilot hole 52A of described spool 50, axial clearance is left between bottom motor shaft ends and pilot hole 52A, the axial force suffered by spool 50 is made all to act on thrust ball bearing 80, thrust ball bearing 10 bears whole load, reducing motor 90 is not by responsive to axial force, to ensure spool 50 flexibility and reliability motion under high pressure, and reduce surface friction drag reduction driving torque.

Under original state, second V-arrangement oilhole 54 links up the first commutation hydraulic fluid port 21A and filler opening 21P, first V-arrangement oilhole 53 links up return opening 21T and second commutation hydraulic fluid port 21B, when reducing motor 90 drives spool 50 half-twist, communication loop becomes: the second V-arrangement oilhole 54 links up the first commutation hydraulic fluid port 21B and filler opening 21P, first V-arrangement oilhole 53 links up return opening 21T and second commutation hydraulic fluid port 21A, complete the commutation function of valve: filler opening 21P → the first commutation hydraulic fluid port 21A, second commutation hydraulic fluid port 21B → return opening filler opening 21P → the second commutation hydraulic fluid port 21B, first commutation hydraulic fluid port 21A → return opening 21T.

Claims (2)

1. A face-sealed rotary valve, comprising a valve body (10), a bottom cover (20), a valve core (50), a compression plug (70), a thrust ball bearing (80), and a reduction motor (90), It is characterized by: The valve body (10) is cylindrical, and its inner cavity is a stepped hole. From left to right, there are bottom threaded section (11), sealing section (12), middle threaded section (13) and top section (14) ); The bottom cover (20) is a two-step stepped shaft, which is composed of a large end (21) and a small end (22). The thread fits, and the outer diameter of the small end (22) is adapted to the sealing section (12); the end face of the big end (21) has a symmetrical and evenly arranged oil return port (21T), the first reversing oil port (21A) , the second reversing oil port (21B), the oil inlet (21P), wherein the oil return port (21T) and the oil inlet (21P) are symmetrical about the center of the big end face, the first reversing oil port (21A) and The second reversing oil port (21B) is symmetrical about the center of the large end face; the small end (22) has an arc-shaped limit chute (22D) on the end face, and its radian is π/4, and the arc-shaped limit chute (22D ) are on the same radial line as the first reversing oil port (21A) and the oil inlet (21P); the oil return port (21T), the first reversing oil port (21A), the first The structural size of the second reversing oil port (21B) and the oil inlet port (21P) are exactly the same, both are second-order stepped holes axially penetrating through the bottom cover, and are composed of a small hole connected to a large hole, and the small hole is located on the bottom cover Big end face; disc springs are installed in the large holes of the oil return port (21T), the first reversing oil port (21A), the second reversing oil port (21B) and the oil inlet port (21P) respectively (30) and valve seat (40), described valve seat (40) is the cylinder with axial center through hole (41); The spool (50) is a two-stage stepped shaft, which is integrally formed by a thick end (51) and a thin end (52), and the outer diameter of the thick end (51) is compatible with the sealing section (12); There are oil return orifice (51T), first reversing oil orifice (51A), second reversing oil orifice (51B) and oil inlet orifice (51P) symmetrically and evenly arranged on the top, and their positions are respectively in line with The axial direction of the valve seat (40) in the oil return port (21T), the first reversing oil port (21A), the second reversing oil port (21B) and the oil inlet port (21P) of the bottom cover (20) The center through hole (41) is corresponding; wherein, the first reversing oil port (51A) and the oil inlet port (51P) are communicated through the first V-shaped oil hole (53) in the spool (50), and the second reversing port The oil port (51B) and the oil return port (51T) communicate through the second V-shaped oil hole (54) in the spool (50), and the first V-shaped oil hole (53) and the second V-shaped oil hole The holes (54) are respectively located on two axially parallel planes symmetrical to the central axis of the valve core in the valve core (50); the limit pin (60) is also fixed on the end face of the thick end, and its position is the same as that of the arc limit. The beginning of the chute (22D) corresponds; the center of the end face of the thin end (52) has an axial assembly hole (52A), which is used to cooperate with the motor shaft of the geared motor (13); The compression plug (70) is a cylinder with an axial center hole (71), and its surface has an external thread, so as to be threadedly engaged with the middle threaded section (13) of the valve body (1); The bottom cover (20) is threadedly connected with the valve body (10), and installed on the bottom threaded section (11) and the sealing section (12) of the valve body (10); the valve core (50) is connected with the valve body (10) ) clearance fit, installed on the sealing section (12) of the valve body (10), so that the limit pin (60) is located in the arc-shaped limit chute (22D) of the bottom cover (20); the compression screw The plug (70) is threadedly matched with the valve body (10), installed on the middle threaded section (13) of the valve body (10), and the thin end (52) of the valve core (50) passes through the compression screw plug (70) Axial center hole (71), thrust ball bearing (80) is installed between the spool (50) and the compression plug (70), the preload of the valve can be easily adjusted by the compression plug (70) ; One end of the geared motor (90) is embedded in the top end section (14) of the valve body (10) and fixed by screw connection, the motor shaft of the geared motor (90) is connected to the thin end (52) of the valve core (50) Fitting holes (52A) fit. 2. The face-sealed rotary valve according to claim 1, characterized in that: The surface of the small end (22) of the bottom cover (20) has a bottom cover annular groove (23) for installing the bottom cover seal ring (110), and the small end (22) is connected to the bottom cover seal ring (110) through the bottom cover seal ring (110). The sealing section (12) cooperates to form a static seal; The valve seat (40) is made of high-strength engineering plastics, the bottom of which is processed into a conical surface (42) for mounting the disc spring (30), and the surface of the valve seat (40) has an annular groove (43) for To install the valve seat sealing ring (120), the valve seat (40) forms a static seal through the cooperation of the valve seat sealing ring (120) and the large hole of the corresponding second-order step hole; The spool (50) is processed by corrosion-resistant alloy, and the surface of the butt end (51) of the spool (50) has a spool annular groove (55) for installing the spool sealing ring (100), and the butt end (51) The sealing ring (100) of the valve core cooperates with the sealing section (12) to form a seal.