CN203906424U - A valve core inside straight motion guide and control mechanism and a fluid control valve - Google Patents
A valve core inside straight motion guide and control mechanism and a fluid control valve Download PDFInfo
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- CN203906424U CN203906424U CN201420219467.0U CN201420219467U CN203906424U CN 203906424 U CN203906424 U CN 203906424U CN 201420219467 U CN201420219467 U CN 201420219467U CN 203906424 U CN203906424 U CN 203906424U
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Abstract
The utility model provides a valve core inside straight motion guide and control mechanism and a fluid control valve. The valve core inside straight motion guide and control mechanism comprises a main valve core and a guide valve core. The main valve core is provided with a plurality of annular grooves arranged in the axial direction. The center of the main valve core is provided with an installing hole in the axial direction, the installing hole being communicated with one end of the main valve core. The guide valve core is embedded in the installing hole. The side wall of the installing hole is provided with first control windows and second control windows which are distributed circumferentially. The guide valve core is provided with an annular groove and the two ends of the annular groove are provided with a left control end and a right control end. A central through hole is formed in the guide valve core. The bottom of the annular groove is provided with a plurality of through holes which are distributed in the circumferential direction and are communicated with the central through hole. The first control windows and the second control windows form closure windows with variable flow-through area with the left control end and the right control end of the guide valve core respectively in the guide valve core moving process. The valve cores have the advantages of small external size, simple structure and high position control precision.
Description
Technical field
The utility model relates to Fluid-transmission and control field, especially, relates to straight moving lead control mechanism and control valve for fluids in a kind of spool.
Background technique
Control valve for fluids is used to regulate pressure, flow and the direction of fluid in liquid control system, ensures that executive component carries out work as requested.The basic structure of control valve for fluids comprises: the device that spool, valve body and driving spool do relative motion in valve body.The basic functional principle of control valve for fluids: utilize spool to control aperture or the break-make of valve port do relative movement in valve body, realize the control of pressure, flow and direction; And the flow of the valve port of flowing through is relevant with pressure difference before and after valve port and valve port area of passage, meets all the time pressure flow equation.
Existing high pressure, large flow fluid control valve particularly hydrovalve adopt the structural type of two-stage or three grades conventionally.Describe as an example of the structure of two-stage hydrovalve example below, a general main valve and the form formation that pilot valve is superimposed of adopting of existing two-stage hydrovalve, in the middle of two valves, by increasing the switching mechanism of displacement-power or realizing the position servo control of pilot valve to main valve plug by additional electric device, concrete structure as shown in Figure 1 and Figure 2.Wherein, the structural representation of two-stage Proportional valve in the prior art that Fig. 1 shows, comprising: pilot valve body 101, pilot control spool 102, proportion electro-magnet 103, main valve body 104 and valve core of main valve 105.Fig. 2 shows the structural representation of two-stage servovalve in prior art, comprising: pilot valve body 201, pilot control spool 202, proportion electro-magnet 203, displacement transducer 204, main valve body 205 and valve core of main valve 206.From above-mentioned two figure, in prior art, pilot valve body and main valve body are relatively independent structure, and both are with form and other member composition control valve for fluids entirety of stack.
Realizing in the utility model process, model utility people finds the structural type of existing control valve for fluids, and at least there are the following problems: one, owing to adopting pilot valve body and the superimposed form of main valve body, the overall volume of control valve for fluids is two valve overall volume sums, thereby has increased installation volume and the weight of control valve for fluids.Two, owing to needing to increase the switching mechanism of displacement-power or electric device between pilot valve body and main valve body to realize the position servo control of pilot valve to main valve plug, cause the structure complicated of control valve entirety, increase manufacturing difficulty, also increased the manufacture cost of control valve simultaneously; Three,, due to the machining accuracy problem of each member, be difficult for improving pilot valve main valve plug led to control precision.
In a word, need the urgent technical problem solving of those skilled in the art to be exactly: how a kind of simple in structure, boundary dimension is little, position control accuracy is high control valve for fluids can be provided.
Summary of the invention
Technical problem to be solved in the utility model is to provide straight moving in a kind of spool and leads control mechanism and control valve for fluids, can reduce the boundary dimension of large flow fluid control valve, simplifies valve core structure, and improves the position control accuracy of pilot valve to main valve plug.
In order to address the above problem, provide on the one hand straight in a kind of spool and movingly led control mechanism, comprising: valve core of main valve and pilot valve spool, be arranged at intervals with the circular groove of several axially-aligned on described valve core of main valve; The center of described valve core of main valve offers the mounting hole being communicated with described valve core of main valve one end along axial direction; Described pilot valve spool is nested in described mounting hole; On the sidewall of described mounting hole, offer one group of first control window along circumferentially distribution and one group of second control window that edge circumferentially distributes;
On described pilot valve spool, be provided with a circular groove, the two ends of described circular groove are provided with left control end and right control end, in described pilot valve spool, offer the center hole of perforation, described circular groove bottom offers circumferentially through hole that distribute, that be communicated with described center hole of several edges;
Described the first control window and second is controlled window and form with left control end and the right control end of described pilot valve spool the window that dams that flow area changes respectively in described pilot valve spool moving process, thereby realizes the control of pilot valve to described valve core of main valve arbitrary position.
Optionally, the mounting hole of offering on described valve core of main valve accounts for a part for valve core of main valve; The remainder of valve core of main valve is solid body.
Optionally, the length of described mounting hole equals the entire length of main valve body, the other end sealing of valve core of main valve.
Optionally, the mounting hole of offering on described valve core of main valve accounts for a part for valve core of main valve; The remainder of valve core of main valve offer the first central through bore and circumferentially distribute, with several first through holes of described the first central through bore vertical connection; Described mounting hole is not communicated with described the first central through bore.
Optionally, described the first central through bore is communicated with the other end of described valve core of main valve; The other end of this valve core of main valve is provided with spool plug.
Optionally, the two ends of described the first central through bore are all sealed.
Optionally, described pilot valve spool is moved to the left in process in mounting hole, and the inside edge of described left control end and first is controlled window inside edge and formed the small window that dams; Described pilot valve spool moves right in process in mounting hole, and the inside edge of described right control end and the described second inside edge of controlling window form the small window that dams.
Optionally, described pilot valve spool is moved to the left in process in mounting hole, and the outer ledge of described right control end and second is controlled window outer ledge and formed the small window that dams; Described pilot valve spool moves right in process in mounting hole, and the outer ledge of described left control end and the described first outer ledge of controlling window form the small window that dams.
On the other hand, also provide a kind of control valve for fluids, having comprised: the straight moving control mechanism of leading in valve body and above-mentioned arbitrary described spool; Described valve body has the valve pocket of perforation, offers some fluid passages that run through described valve body both sides on the inwall of this valve pocket; Directly in described spool movingly lead control mechanism and be placed in described valve pocket, the two ends of the left side of spool and an anchor ring and described valve pocket form respectively sensitive cavity and right valve chamber; The area of the spool left side of described sensitive cavity is greater than the area of the spool anchor ring that forms described right valve chamber;
When described pilot valve spool has after a straight line motion input, described first controls window and second controls the flow area that window forms the window that dams with the left control end of described pilot valve spool and right control end respectively in described pilot valve spool moving process and changes, and then change the pressure of described sensitive cavity, thereby realize the control of pilot valve to described valve core of main valve arbitrary position.
Optionally, described control valve for fluids is specially hydrovalve.
Compared with prior art, a technological scheme in technique scheme has the following advantages:
In the spool that the utility model provides, directly moving and leading control mechanism is the nested inside pilot valve spool at valve core of main valve, serve as the valve body of pilot valve with valve core of main valve, lead compared with control structure with existing, designs simplification, cut down number of components, the volume that has not only dwindled control valve for fluids has also effectively alleviated the weight of control valve.
In addition, directly in spool that the utility model provides movingly lead control mechanism and do not need additional other mechanism just can realize position feedback, compare conventional fluid control unit and saved the switching mechanism of displacement-power, thereby reduced manufacturing difficulty, and then reduced cost of production.
In addition, the straight moving control mechanism of leading in the spool of the control valve for fluids that the utility model provides, regulate the hydrodynamic pressure of sensitive cavity by built-in pilot valve spool moving linearly in mounting hole, and then regulate continuously the pressure difference of left and right valve pocket, realize valve core of main valve and in valve body, do straight line motion, thereby improved the position control accuracy of pilot valve to main valve plug.
Brief description of the drawings
Fig. 1 is the structural representation of Proportional valve in prior art;
Fig. 2 is the structural representation of servovalve in prior art;
Fig. 3 is straight moving sectional view of leading control mechanism embodiment one in the utility model spool;
Fig. 4-1st, the structural representation one of straight moving valve core of main valve of leading control mechanism embodiment one in the utility model spool;
Fig. 4-2nd, the structural representation two of straight moving valve core of main valve of leading control mechanism embodiment one in the utility model spool;
Fig. 4-3rd, the sectional view of straight moving valve core of main valve of leading control mechanism embodiment one in the utility model spool;
Fig. 5 is the structural representation of straight moving pilot valve spool of leading control mechanism embodiment one in the utility model spool;
Fig. 6 is the utility model control valve for fluids embodiment one structural representation;
Fig. 7-1st, the schematic diagram of the utility model control valve for fluids embodiment one under state of equilibrium;
Fig. 7-2nd, the work schematic diagram of the utility model control valve for fluids embodiment one in the time that pilot valve spool is moved to the left;
Fig. 7-3rd, the work schematic diagram of the utility model control valve for fluids embodiment one in the time that pilot valve spool moves right;
Fig. 8 is straight moving sectional view of leading control mechanism embodiment two in the utility model spool;
Fig. 9-1st, the structural representation one of straight moving valve core of main valve of leading control mechanism embodiment two in the utility model spool;
Fig. 9-2nd, the structural representation two of straight moving valve core of main valve of leading control mechanism embodiment two in the utility model spool;
Figure 10 is the utility model control valve for fluids embodiment two structural representation;
Figure 11-1st, the schematic diagram of the utility model control valve for fluids embodiment two under state of equilibrium;
Figure 11-2nd, the work schematic diagram of the utility model control valve for fluids embodiment two in the time that pilot valve spool is moved to the left;
Figure 11-3rd, the work schematic diagram of the utility model control valve for fluids embodiment two in the time that pilot valve spool moves right;
Figure 12 is straight moving sectional view of leading control mechanism embodiment three in the utility model spool;
Figure 13-1st, the structural representation one of straight moving valve core of main valve of leading control mechanism embodiment three in the utility model spool;
Figure 13-2nd, the structural representation two of straight moving valve core of main valve of leading control mechanism embodiment three in the utility model spool;
Figure 13-3rd, the sectional view of straight moving valve core of main valve of leading control mechanism embodiment three in the utility model spool;
Figure 14 is the utility model control valve for fluids embodiment three structural representation;
Figure 15-1st, the schematic diagram of the utility model control valve for fluids embodiment three under state of equilibrium;
Figure 15-2nd, the work schematic diagram of the utility model control valve for fluids embodiment three in the time that pilot valve spool is moved to the left;
Figure 15-3rd, the work schematic diagram of the utility model control valve for fluids embodiment three in the time that pilot valve spool moves right.
description of reference numerals:
The 1-the first valve core of main valve; 2-pilot valve spool; The 11-the first circular groove; 12-mounting hole; 13-the first controls window; 14-the second controls window; The 21-the second circular groove; 22-left control end; 23-right control end;
24-center hole; 25-through hole; 61-valve body; 62-fluid passage; 63-sensitive cavity; 64-right valve chamber; The 81-the second valve core of main valve; The left side of A-main valve plug; The anchor ring on B-main valve plug right side; The 15-the first central through bore; The 16-the first through hole; The 17-the second through hole; 18-spool plug; The 20-the second spool; The 121-the three valve core of main valve; The 122-the three mounting hole; 123-the first controls window; 124-the second controls window.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
One of core idea of the utility model embodiment is, mounting hole is offered in valve core of main valve inside at control valve for fluids, pilot valve spool is placed in the mounting hole of valve core of main valve inside, make pilot valve spool be nested in valve core of main valve inside, serve as the valve body of pilot valve with valve core of main valve, pilot valve spool can move in mounting hole.Be specially: after pilot valve spool has any one straight line motion input, will change the left valve pocket pressure of (being referred to as below sensitive cavity), the left and right equilibrant of main valve is broken, valve core of main valve will be followed pilot valve spool to identical moving direction motion.In movement process, the pressure of sensitive cavity also can change thereupon, will set up new equilibrium of forces when moving to certain position.By the mobile adjusting that realizes the window size that dams in mounting hole of above-mentioned pilot valve spool, thereby the pressure in the right chamber of modulating valve, finally realize the position servo to main valve, this mechanism form dwindles the size of control valve for fluids entirety, cut down the number of components, alleviate the overall weight of control valve for fluids, and realize the Accurate Position Control of pilot valve to main valve.
Embodiment one
With reference to Fig. 3 to Fig. 5, show straight moving structural representation of leading control mechanism embodiment one in the utility model spool, wherein Fig. 3 shows straight moving sectional view of leading control mechanism embodiment one in the utility model spool, and Fig. 4-1,4-2 show the structural representation of straight moving valve core of main valve of leading control mechanism embodiment one in spool; Fig. 4-3 show the sectional view of the first valve core of main valve 1.From above-mentioned each figure, directly in spool that the utility model provides movingly lead control mechanism embodiment one and comprise: the first valve core of main valve 1 and pilot valve spool 2.On valve core of main valve 1, be arranged at intervals with several the first circular grooves 11 of arranging vertically.The first valve core of main valve 1 is divided into two-part, and as shown in Figure 3, in the left part of the first valve core of main valve 1, the right side that offers mounting hole 12, the first valve core of main valve 1 of opening one end along central axial direction is divided into solid construction.
Pilot valve spool 2 is nested in mounting hole 12, can be along the axial direction moving linearly of mounting hole 12.As shown in Fig. 4-1,4-2, on the sidewall of mounting hole 12, offer one group of first control window 13 being uniformly distributed circumferentially and one group of second control window 14 being uniformly distributed circumferentially.
Fig. 5 shows the structural representation of pilot valve spool 2, and the two ends that are provided with second circular groove 21, the second circular grooves 21 on pilot valve spool 2 are provided with left control end 22 and right control end 23.Pilot valve spool 2 Nei Yan center axial directions offer the center hole 24 of perforation.The second circular groove 21 bottoms offer several through holes that are uniformly distributed circumferentially 25, and each through hole 25 is communicated with center hole 24.
Pilot valve spool 2, in the interior process moving along axial direction of mounting hole 12, first is controlled between window 13 and left control end 22, second is controlled between window 14 and right control end 23 and understand the small window that dams of formation.
Control valve for fluids embodiment one
Corresponding, the utility model also provides control valve for fluids embodiment one, control valve for fluids embodiment's one as shown in Figure 6 structural representation, the interior straight moving control mechanism of leading that the utility model control valve for fluids embodiment one adopts is the interior straight moving control mechanism embodiment one that leads shown in Fig. 3 to Fig. 5.
Particularly, the control valve for fluids embodiment one that the utility model provides comprises: valve body 61 and the first spool 10.Valve body 61 has the valve pocket of perforation, offers some fluid passages 62 on the inwall of valve pocket.Fluid passage 62 is arranged side by side along the axial direction of valve pocket, connects two sides of valve body.The first spool 10 is placed in the valve pocket of valve body 61, is combined with valve pocket sidewall and forms sensitive cavity 63 and right valve chamber 64, the first spools 10 and can in valve pocket, in axial direction slide in two ends.As shown in Fig. 4-1,4-2, the area that forms the spool left side A of sensitive cavity 63 is greater than the area of the spool anchor ring B that forms right valve chamber 64.The first spool 10 is the structure shown in spool embodiment one, comprising: the first valve core of main valve 1, pilot valve spool 2, concrete structure is as shown in Fig. 3 to 5.
Above-mentioned fluid passage 62 comprises: the valve body hole or the valve seat orifice that on valve body, arrange, coordinate with spool, and the inlet/outlet of external fluid hose etc.Particularly, as shown in Fig. 7-1, fluid passage 62 comprises: two high-pressure liquid import P that arrange on valve body 61, two fluid output T, two external control mouths of fluid (unmarked in figure).
Accordingly, in the utility model control valve for fluids embodiment one, it is low voltage control window that first of the first valve core of main valve 1 is controlled window 13, and the second control window 14 is high voltage control window.The left control end 22 of pilot valve spool 2 is low voltage control end, and right control end 23 is high voltage control end.
Below in conjunction with Fig. 7-1,7-2,7-3 explanation control valve for fluids embodiment's one working procedure.Wherein, Fig. 7-1 shows the schematic diagram of control valve for fluids embodiment one under state of equilibrium; Fig. 7-2 show the work schematic diagram of control valve for fluids embodiment one in the time that pilot valve spool is moved to the left; Fig. 7-3 show the work schematic diagram of control valve for fluids embodiment one in the time that pilot valve spool moves right.
As shown in Fig. 7-1, when pilot valve spool 2 is at the mounting hole 12 of the first valve core of main valve 1 during in working position, to form micro gap be the small window that dams to the inside edge of the left control end 22 of pilot valve spool 2 inner side edge that window 13 is controlled on the right and first on the right, simultaneously, the inner side edge of the right control end 23 of pilot valve spool is that the left side and the second inner side edge of controlling window 14 are that left side formation micro gap is the small window that dams, when state of equilibrium, the width of this small window that dams generally at 0.01mm between 0.1mm.These two micro gap series connection form resistance half-bridge, and the pressure of sensitive cavity 63 just can regulate by this resistance half-bridge; The pressure of right valve chamber 64 is by being communicated with external fluid path, and perseverance equates with system pressure P.
Between valve core of main valve end face A and anchor ring B, have difference in areas, the area of valve core of main valve left side A is greater than the area of anchor ring B, and under state of equilibrium, the flow area of two micro gaps is relevant with the ratio between left side A and anchor ring B.For example, if the area of valve core of main valve left side A is 2 times of valve core of main valve anchor ring B area, when pilot valve spool 2 relative with the first valve core of main valve 1 when static, the pressure of sensitive cavity 63 is P/2, the micro gap area approximation that pilot valve spool 2 left and right both ends of the surface and the first control window intersect equates, as shown in Fig. 7-1.
As shown in Fig. 7-2, in the time that pilot valve spool 2 is moved to the left, the small through-flow gap that the right control end 23 of pilot valve spool and the second control window 14 form is closed; The left control end 22 of pilot valve spool and first is controlled the circulation area increase that window 13 forms.The flow area that now sensitive cavity 63 forms by main valve mounting hole 12, pilot valve center hole 24, through hole 25, left control end 22 and the first control window 13 communicates with atmospheric pressure T.The pressure of sensitive cavity 63 is reduced to atmospheric pressure T.The pressure of right valve chamber 64 is still system pressure P, valve core of main valve loses equilibrium of forces and is moved to the left under the effect of axial force, until high low pressure control window is while getting back to state of equilibrium again and the residing relative position of pilot valve spool 2, first, second shown in Fig. 7-1 controlled the relative position of the left and right control end of window and pilot valve spool.
As shown in Fig. 7-3, in the time that pilot valve spool 2 moves right, the small through-flow gap that the left control limit 22 of pilot valve spool and the first control window 13 form is closed; The right control limit 23 of pilot valve spool and second is controlled window 14 and is formed flow area increase.Now, the flow area that sensitive cavity 63 forms by right control limit 23 and the second control window 14 of main valve mounting hole 12, pilot valve center hole 24, through hole 25, pilot valve spool communicates with system pressure P.The pressure of sensitive cavity 63 raises as system pressure P.The pressure of right valve chamber 64 is still system pressure P.Owing to having difference in areas between valve core of main valve end face A and anchor ring B, the area of end face A is greater than the area of anchor ring B, the first valve core of main valve 1 loses equilibrium of forces and under the effect of axial force, moves right until high low pressure control window while getting back to state of equilibrium again and the residing relative position of pilot valve spool 2, as shown in Fig. 7-1.
Embodiment two
With reference to Fig. 8 to Figure 10, show straight moving structural representation of leading control mechanism embodiment two in the utility model spool, wherein Fig. 8 shows straight moving sectional view of leading control mechanism embodiment two in the utility model spool, and Fig. 9-1,9-2 show the structural representation of the second valve core of main valve.In the spool that the utility model provides, directly moving and leading control mechanism embodiment two is that the structure to valve core of main valve changes on embodiment one basis, specifically comprises: the second valve core of main valve 81 and pilot valve spool 2.On the second valve core of main valve 81, be arranged at intervals with several the first circular grooves 11 of arranging vertically.
The second valve core of main valve 81 is divided into two-part, and as shown in Figure 8, the structure of the left part of the second valve core of main valve 81 is identical with the structure of corresponding position in spool embodiment one.Offer along central axial direction the mounting hole 12 of opening one end.Pilot valve spool 2 is nested in mounting hole 12, can be along the axial direction moving linearly of mounting hole 12.On the sidewall of mounting hole 12, offer one group of first control window 13 being uniformly distributed circumferentially and one group of second control window 14 being uniformly distributed circumferentially.
Different from above-mentioned spool embodiment one: in the present embodiment, the right side part of the second valve core of main valve 81 also offers several first through holes 16 of the first central through bore 15, circumferentially distribution, circumferential several the second through holes 17 that distribute.The first central through bore 15 is not communicated with mounting hole 12.The first through hole 16, the second through hole 17 and the first central through bore 15 vertical connections.
As shown in Figure 8, the first central through bore 15 can be communicated with the right-hand member of the second valve core of main valve 81, in use need to add spool plug 18 at the first central through bore 15 places that open.Certainly, the right-hand member of valve core of main valve 81 also can be arranged to sealing.
Straight moving leading in control mechanism embodiment two in the utility model spool, the concrete structure of pilot valve spool 2 is identical, shown in Figure 5 with the structure of pilot valve spool 2 in embodiment one, is no longer described in detail herein.
Control valve for fluids embodiment two
Corresponding, the utility model also provides control valve for fluids embodiment two, control valve for fluids embodiment's two as shown in figure 10 structural representation, and the spool that the control valve for fluids embodiment two that the utility model provides adopts is the spool embodiment two shown in Fig. 8.
Particularly, the control valve for fluids embodiment two that the utility model provides comprises: valve body 61 and the second spool 20.Same or similar with control valve for fluids embodiment one, valve body 61 has the valve pocket of perforation, offers some fluid passages 62 on the inwall of valve pocket.Fluid passage 62 is arranged side by side along the axial direction of valve pocket, connects two sides of valve body.The second spool 20 is placed in the valve pocket of valve body 61, is combined with valve pocket sidewall and forms sensitive cavity 63 and right valve chamber 64, the second spools 20 and can in valve pocket, in axial direction slide in two ends.As shown in Fig. 9-1,9-2, the area that forms the spool left side A of sensitive cavity 63 is greater than the area of the spool anchor ring B that forms right valve chamber 64.The second spool 20 is the structure shown in spool embodiment two, comprising: the second valve core of main valve 81 and pilot valve spool 2.Between the second spool 20 and valve body 61, be provided with fluid passage 62, structure specifically as shown in figure 10.
Similarly, above-mentioned fluid passage 62 comprises: the valve body hole or the valve seat orifice that on valve body, arrange, coordinate with spool, and the inlet/outlet of external fluid hose etc.Particularly, implement in two at the utility model control valve for fluids, as shown in Figure 11-1, fluid passage 62 comprises: a high-pressure liquid import P arranging on valve body 61, two fluid output T, two external control mouths of fluid (unmarked in figure).
In the utility model control valve for fluids embodiment two, it is low voltage control window that first of the second valve core of main valve 81 is controlled window 13, and the second control window 14 is high voltage control window.The left control end 22 of pilot valve spool 2 is low voltage control end, and right control end 23 is high voltage control end.
Below in conjunction with Figure 11-1,11-2,11-3 explanation control valve for fluids embodiment's two working procedure.Wherein, Figure 11-1 shows the schematic diagram of control valve for fluids embodiment two under state of equilibrium; Figure 11-2 show the work schematic diagram of control valve for fluids embodiment two in the time that pilot valve spool is moved to the left; Figure 11-3 show the work schematic diagram of control valve for fluids embodiment two in the time that pilot valve spool moves right.
As shown in Figure 11-1, when pilot valve spool 2 is at the mounting hole 12 of the second valve core of main valve 81 during in working position, the right formation micro gap that window 13 is controlled on the right of the left control end 22 of pilot valve spool and first is the small window that dams, simultaneously, the left side formation micro gap that window 14 is controlled on the left side of the right control end 23 of pilot valve spool and second is the small window that dams, when state of equilibrium, the width of this small window that dams also generally at 0.01mm between 0.1mm.These two micro gap series connection form resistance half-bridge, and the pressure of sensitive cavity 63 just can regulate by this resistance half-bridge.The internal fluid passageway perseverance that the pressure of right valve chamber 64 consists of the first through hole 16, the first central through bore 15, the second through hole 17 equates with system pressure P.
Between the left side A of the second valve core of main valve 81 and anchor ring B, have difference in areas, the area of the left side A of the second valve core of main valve 81 is greater than the area of anchor ring B, and under state of equilibrium, the flow area of two micro gaps is relevant with the ratio between end face A and anchor ring B.For example, if the area of the left side A of the second valve core of main valve 81 is 2 times of anchor ring B area, when pilot valve spool 2 relative with the second valve core of main valve 81 when static, the pressure of sensitive cavity 63 is P/2, pilot valve spool 2 left and right both ends of the surface equate with the micro gap area approximation that high low pressure control window intersects, as shown in Figure 11-1.
As shown in Figure 11-2, in the time that pilot valve spool 2 is moved to the left, the small through-flow gap that the right control end 23 of pilot valve spool and the second control window 14 form is closed; The left control end 22 of pilot valve spool and first is controlled the circulation area increase that window 13 forms.The flow area that now sensitive cavity 63 forms by main valve mounting hole 12, pilot valve center hole 24, through hole 25, left control end 22 and the first control window 13 communicates with atmospheric pressure T.The pressure of sensitive cavity 63 is reduced to atmospheric pressure T.The pressure of right valve chamber 64 still equals system pressure P, the second valve core of main valve 81 loses equilibrium of forces and is moved to the left under the effect of axial force, until high low pressure control window is while getting back to state of equilibrium again and the residing relative position of pilot valve spool 2, window 13, second is controlled and controls the relative position of window 14 and the left and right control end of pilot valve spool in first shown in Figure 11-1.
As shown in Figure 11-3, in the time that pilot valve spool 2 moves right, the small through-flow gap that the left control limit 22 of pilot valve spool and the first control window 13 form is closed; The right control limit 23 of pilot valve spool and second is controlled window 14 and is formed flow area increase.Now, the flow area that sensitive cavity 63 forms by right control limit 23 and the second control window 14 of main valve mounting hole 12, pilot valve center hole 24, through hole 25, pilot valve spool communicates with system pressure P.The pressure of sensitive cavity 63 raises as system pressure P.The internal path that the pressure of right valve chamber 64 consists of the first through hole 16, the first central through bore 15, the second through hole 17 equates with system pressure P.Owing to having difference in areas between the left side A of the second valve core of main valve 81 and anchor ring B, the second valve core of main valve 81 loses equilibrium of forces and under the effect of axial force, moves right until high low pressure control window while getting back to state of equilibrium again and the residing relative position of pilot valve spool 2, as shown in Figure 11-1.
Embodiment three
With reference to Figure 12, Figure 13, show straight moving structural representation of leading control mechanism embodiment three in the utility model spool, wherein, Figure 12 shows straight moving sectional view of leading control mechanism embodiment three in the utility model spool, and Figure 13-1,13-2,13-3 show the structural representation of the 3rd valve core of main valve.In the spool that the utility model provides, directly moving and leading control mechanism embodiment three is that the structure to valve core of main valve changes on embodiment one basis, specifically comprises: the 3rd valve core of main valve 121 and pilot valve spool 2.On the 3rd valve core of main valve 121, be arranged at intervals with several the first circular grooves 11 of arranging vertically.
With reference to the sectional view of the valve core of main valve shown in perspective view and Figure 13-3 of the valve core of main valve shown in Figure 13-1,13-2, in the inside of the 3rd valve core of main valve 121, offer along central axial direction the 3rd mounting hole 122, the three mounting holes 122 of opening one end and run through whole valve core of main valve.On the sidewall of the middle position of the 3rd valve core of main valve 121, the 3rd mounting hole 122, offer one group be uniformly distributed circumferentially first control that window 123 and one group is uniformly distributed circumferentially second control window 124.
As shown in figure 12, pilot valve spool 2 is nested in the 3rd mounting hole 122, can be along the axial direction moving linearly of the 3rd mounting hole 122.
Straight moving leading in control mechanism embodiment three in the utility model spool, the concrete structure of pilot valve spool 2 is identical, shown in Figure 5 with the structure of the pilot valve spool 2 in embodiment one, is no longer described in detail herein.
Control valve for fluids embodiment three
Corresponding, the utility model also provides control valve for fluids embodiment three, the utility model control valve for fluids embodiment's three shown in Figure 14 structural representation, what the utility model control valve for fluids embodiment three adopted leads control mechanism is the straight moving control mechanism embodiment three that leads in the spool shown in Figure 12.
Particularly, the control valve for fluids embodiment three that the utility model provides comprises: valve body 61 and be placed in the 3rd spool 30 of the valve pocket of this valve body 61.The 3rd spool 30 comprises: the 3rd valve core of main valve 121 and pilot valve spool 2.Between the 3rd spool 30 and valve body 61, be provided with fluid passage 62.The 3rd spool 30 is placed in the valve pocket of valve body 61, is combined with valve pocket sidewall and forms sensitive cavity 63 and right valve chamber 64 in two ends.Wherein, as shown in Figure 12,13-1,13-2, the area that forms the spool left side A of sensitive cavity 63 is greater than the area of the anchor ring B that forms right valve chamber 64.
Equally, above-mentioned fluid passage 62 comprises: the valve body hole or the valve seat orifice that on valve body, arrange, coordinate with spool, and the inlet/outlet of external fluid hose etc.Particularly, as shown in Figure 15-1, fluid passage 62 comprises: two high-pressure liquid import P that arrange on valve body 61, two fluid output T, two external control mouths of fluid (unmarked in figure).
Corresponding, in the utility model control valve for fluids embodiment three, it is high voltage control window that first of the 3rd valve core of main valve 121 is controlled window 123, the second control window 124 is low voltage control window.The left control end 22 of pilot valve spool 2 is high voltage control end, and right control end 23 is low voltage control end.
Below in conjunction with Figure 15-1,15-2,15-3 explanation control valve for fluids embodiment's three working procedure.Wherein, Figure 15-1 shows the schematic diagram of control valve for fluids embodiment three under state of equilibrium; Figure 15-2 show the work schematic diagram of control valve for fluids embodiment three in the time that pilot valve spool is moved to the left; Figure 15-3 show the work schematic diagram of control valve for fluids embodiment three in the time that pilot valve spool moves right.
As shown in Figure 15-1, when pilot valve spool 2 is at the 3rd mounting hole 122 of the 3rd valve core of main valve 121 during in working position, the outer ledge of the left control end 22 of pilot valve spool is that the left side and the first outer ledge of controlling window 123 are that left side formation micro gap is the small window that dams, simultaneously to form micro gap be the small window that dams to the outer ledge of the right control end 23 of the pilot valve spool outer ledge that window 124 is controlled on the right and second on the right, similar with above-mentioned two embodiments, when state of equilibrium, the width of this small window that dams generally at 0.01mm between 0.1mm.These two micro gap series connection form resistance half-bridge, and the pressure of left valve pocket 63 just can regulate by this resistance half-bridge.The pressure of right valve chamber 64 equates with system pressure P by external fluid path is permanent.
Between valve core of main valve end face A and anchor ring B, have difference in areas, the area of valve core of main valve left side A is greater than the area of anchor ring B, and under state of equilibrium, the flow area of two micro gaps is relevant with the ratio between end face A and anchor ring B.For example, if the area of valve core of main valve left side A is 2 times of valve core of main valve anchor ring B area, when pilot valve spool 2 relative with valve core of main valve 1 when static, the pressure of sensitive cavity 63 is P/2, the micro gap area approximation that pilot valve spool 2 left and right both ends of the surface and high the first control window intersect equates, as shown in Figure 15-1.
As shown in Figure 15-2, in the time that pilot valve spool 2 is moved to the left, the small through-flow gap that the left control end 22 of pilot valve spool and the first control window 123 form is closed; The outer ledge of the right control end 23 of pilot valve spool i.e. the right and second is controlled the flow area increase that outer ledge of window 124 forms between the right.The flow area that sensitive cavity 63 forms by left control end 22 and the first control window 123 of the 3rd mounting hole 122, pilot valve center hole 24, pilot valve spool communicates with atmosphere, and the pressure decreased of sensitive cavity 63 is atmospheric pressure T.The pressure of right valve chamber 64 is still system pressure P, the 3rd valve core of main valve 121 loses equilibrium of forces and under the effect of axial force, is moved to the left until high low pressure control window is got back to again when static and the residing relative position of pilot valve spool, i.e. relative position shown in Figure 15-1.
As shown in Figure 15-3, in the time that pilot valve spool 2 moves right, the small through-flow gap that the right control end 23 of pilot valve spool and the second control window 124 form is closed; The outer ledge of the left control end 22 of pilot valve spool is that the left side and the first outer ledge of controlling window 123 are between the left side, to form flow area to increase.Now, sensitive cavity 63 communicates with system pressure P by left control end 22 and first flow area of controlling formation between window 123 of the 3rd mounting hole 122, pilot valve spool.The pressure of sensitive cavity 63 raises as system pressure P.The pressure of right valve chamber 64 is still system pressure P.Due to the existence of difference in areas between the left side A of the 3rd valve core of main valve 121 and right side anchor ring B, the 3rd valve core of main valve 121 loses equilibrium of forces and under the effect of axial force, moves right until high low pressure control window is got back to again when static and the residing relative position of pilot valve spool, i.e. relative position shown in Figure 15-1.
Directly moving in the spool above the utility model being provided lead the each embodiment of control mechanism and corresponding control valve for fluids embodiment has done brief description, it should be noted that: above-mentioned first control window, second control window can be rounded, rectangle, triangle or the shape such as trapezoidal.Described each control valve for fluids embodiment can be specially hydrovalve.In addition; also can be used in embodiment three for the mode that forms the small window that dams between pilot valve spool control end in embodiment one and embodiment two and control window; certainly; the mode that forms the small window that dams in embodiment three between the control end of pilot valve spool and control window also can be used in embodiment one, the second-class more embodiments of embodiment; those skilled in the art are to be understood that: above-described embodiment only, as example, should not be construed as the restriction to the utility model protection domain.
Also it should be noted that: although the control valve for fluids shown in the various embodiments described above is under state of equilibrium, the position relationship that pilot valve spool and first is controlled window, the second control window is negative covering relation, be under state of equilibrium, the right control end and second of the left control end of pilot valve spool and the first control window, pilot valve spool is controlled between window and is all formed the small window that dams, and the entire length of pilot valve spool is less than the first control window and the second distance of controlling between window in other words; But in other embodiment of the present utility model, the position relationship that also pilot valve spool under state of equilibrium and first can be controlled to window, the second control window is designed to zero lap or plus lap relation.Wherein, the situation of zero lap is specially: the entire length of pilot valve spool equals the first control window, the second distance of controlling between window.The situation of plus lap is specially: the length of pilot valve spool is greater than the distance of the first control window and the second control window.That is to say, no matter zero lap or plus lap situation, when state of equilibrium, between the right control end of the left control end of pilot valve spool and the first control window, pilot valve spool and the second control window, all without micro gap, also can be said to above-mentioned two small windows that dam and all blocked.Above-mentioned pilot valve spool and first is controlled the position relationship of window, the second control window in plus lap or negative situation about hiding, and can realize equally pilot valve spool the arbitrary position of valve core of main valve is controlled.
Visible, in the spool that the utility model provides, directly moving and leading control mechanism is the nested inside pilot valve spool at valve core of main valve, serves as the valve body of pilot valve with valve core of main valve.Therefore, boundary dimension sum when the volume of the control valve for fluids that the utility model provides is no longer pilot valve and main valve stack, and be only the boundary dimension of main valve, weight is no longer also the weight sum of pilot valve and main valve, effectively dwindles the volume of control valve for fluids and has alleviated the weight of control valve for fluids.
In addition, the control valve for fluids that the utility model provides does not need additional other mechanism just can realize position feedback in structural type.Compare conventional fluid control valve and saved the switching mechanism of displacement-power, greatly reduce like this manufacturing difficulty, reduced cost of production.
In addition, the control valve for fluids that the utility model provides regulates the hydrodynamic pressure of sensitive cavity by built-in pilot valve spool moving linearly in the mounting hole of valve core of main valve, the control end by pilot valve spool and the continuous variation of controlling the flow area forming between window edge are to regulate continuously the pressure difference of sensitive cavity and right valve chamber, realize the continuous control of pressure, flow and the direction of valve body inner fluid and in valve body, do straight line motion to control valve core of main valve, thereby improved the position control accuracy of pilot valve to main valve plug.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and other embodiments' difference, between each embodiment identical similar part mutually referring to.For control valve for fluids embodiment, because the spool as its critical piece is described in detail in spool embodiment before, so its structure description is fairly simple, relevant part is referring to spool embodiment's explanation.
Above to the straight moving control valve for fluids of leading control mechanism and using this spool in a kind of spool provided by the utility model, be described in detail, applied specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present utility model and core concept thereof; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model meanwhile.
Claims (10)
1. directly in spool movingly lead a control mechanism, it is characterized in that, comprising: valve core of main valve and pilot valve spool, be arranged at intervals with the circular groove of several axially-aligned on described valve core of main valve; The center of described valve core of main valve offers the mounting hole being communicated with described valve core of main valve one end along axial direction; Described pilot valve spool is nested in described mounting hole; On the sidewall of described mounting hole, offer one group of first control window along circumferentially distribution and one group of second control window that edge circumferentially distributes;
On described pilot valve spool, be provided with a circular groove, the two ends of described circular groove are provided with left control end and right control end, in described pilot valve spool, offer the center hole of perforation, described circular groove bottom offers circumferentially through hole that distribute, that be communicated with described center hole of several edges;
Described the first control window and second is controlled window and form with left control end and the right control end of described pilot valve spool the window that dams that flow area changes respectively in described pilot valve spool moving process, thereby realizes the control of pilot valve to described valve core of main valve arbitrary position.
2. in spool according to claim 1, straight moving led control mechanism, it is characterized in that, the mounting hole of offering on described valve core of main valve accounts for a part for valve core of main valve; The remainder of valve core of main valve is solid body.
3. in spool according to claim 1, straight moving led control mechanism, it is characterized in that, the length of described mounting hole equals the entire length of main valve body, the other end sealing of valve core of main valve.
4. in spool according to claim 1, straight moving led control mechanism, it is characterized in that, the mounting hole of offering on described valve core of main valve accounts for a part for valve core of main valve; The remainder of valve core of main valve offer the first central through bore and circumferentially distribute, with several first through holes of described the first central through bore vertical connection; Described mounting hole is not communicated with described the first central through bore.
5. in spool according to claim 4, straight moving led control mechanism, it is characterized in that, described the first central through bore is communicated with the other end of described valve core of main valve; The other end of this valve core of main valve is provided with spool plug.
6. in spool according to claim 4, straight moving led control mechanism, it is characterized in that, the two ends of described the first central through bore are all sealed.
7. lead control mechanism according to straight moving in the arbitrary described spool of claim 1 to 6, it is characterized in that, described pilot valve spool is moved to the left in process in mounting hole, and the inside edge of described left control end and first is controlled window inside edge and formed the small window that dams;
Described pilot valve spool moves right in process in mounting hole, and the inside edge of described right control end and the described second inside edge of controlling window form the small window that dams.
8. lead control mechanism according to straight moving in the arbitrary described spool of claim 1 to 6, it is characterized in that, described pilot valve spool is moved to the left in process in mounting hole, and the outer ledge of described right control end and second is controlled window outer ledge and formed the small window that dams;
Described pilot valve spool moves right in process in mounting hole, and the outer ledge of described left control end and the described first outer ledge of controlling window form the small window that dams.
9. a control valve for fluids, is characterized in that, comprising: the straight moving control mechanism of leading in the arbitrary described spool of valve body and claim 1 to 8; Described valve body has the valve pocket of perforation, offers some fluid passages that run through described valve body both sides on the inwall of this valve pocket; Directly in described spool movingly lead control mechanism and be placed in described valve pocket, the two ends of the left side of spool and an anchor ring and described valve pocket form respectively sensitive cavity and right valve chamber; The area of the spool left side of described sensitive cavity is greater than the area of the spool anchor ring that forms described right valve chamber;
When described pilot valve spool has after a straight line motion input, described first controls window and second controls the flow area that window forms the window that dams with the left control end of described pilot valve spool and right control end respectively in described pilot valve spool moving process and changes, and then change the pressure of described sensitive cavity, thereby realize the control of pilot valve to described valve core of main valve arbitrary position.
10. control valve for fluids according to claim 9, is characterized in that, described control valve for fluids is specially hydrovalve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219467.0U CN203906424U (en) | 2014-04-30 | 2014-04-30 | A valve core inside straight motion guide and control mechanism and a fluid control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219467.0U CN203906424U (en) | 2014-04-30 | 2014-04-30 | A valve core inside straight motion guide and control mechanism and a fluid control valve |
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| Publication Number | Publication Date |
|---|---|
| CN203906424U true CN203906424U (en) | 2014-10-29 |
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| CN201420219467.0U Expired - Fee Related CN203906424U (en) | 2014-04-30 | 2014-04-30 | A valve core inside straight motion guide and control mechanism and a fluid control valve |
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| CN (1) | CN203906424U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020190A (en) * | 2014-04-30 | 2015-11-04 | 张凯 | Straight-moving guide control mechanism in valve core and fluid control valve |
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- 2014-04-30 CN CN201420219467.0U patent/CN203906424U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020190A (en) * | 2014-04-30 | 2015-11-04 | 张凯 | Straight-moving guide control mechanism in valve core and fluid control valve |
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Granted publication date: 20141029 Termination date: 20160430 |