CN113623284B - Compact structure type load sensitive valve - Google Patents
Compact structure type load sensitive valve Download PDFInfo
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- CN113623284B CN113623284B CN202110922210.6A CN202110922210A CN113623284B CN 113623284 B CN113623284 B CN 113623284B CN 202110922210 A CN202110922210 A CN 202110922210A CN 113623284 B CN113623284 B CN 113623284B
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- sleeve
- spring seat
- valve core
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- 238000013016 damping Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Servomotors (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a compact-structure load sensitive valve, which comprises a valve sleeve (64) arranged in a valve body (61) of a pump power valve, wherein a valve core (63) is arranged in the valve sleeve (64); the valve further comprises a threaded sleeve (611) arranged at the tail end of the valve body (61) of the pump power valve, a large spring seat (65) and a small spring seat (68) are sequentially arranged in the threaded sleeve (611) from front to back, the large spring seat (65) is in smooth spherical surface positioning fit with the tail end of the valve core (63), the tail end of the small spring seat (68) is connected with a pressure regulating screw (69), and a sealing lock nut (610) is further arranged on the pressure regulating screw (69); a small spring (67) is arranged between the large spring seat (65) and the small spring seat (68), and a large spring (66) is arranged between the large spring seat (65) and the screw sleeve (611); the inside of case (63) front end still is equipped with damping plug (62). The invention has the characteristics of effectively reducing the installation space, reducing the production difficulty and reducing the production cost.
Description
Technical Field
The invention relates to a load-sensitive valve, in particular to a load-sensitive valve with a compact structure.
Background
The load sensing valve is a flow control valve that regulates the flow of the pump to the flow required by the actuator. The specific working principle is as follows: the flow rate of the pump is related to the cross-sectional area of an external sensing orifice (hereinafter referred to as a throttle valve) installed between the pump outlet and the actuator; comparing the pressure before and after the throttle valve through the load sensitive valve, and keeping the pressure drop (hereinafter referred to as pressure difference) of the throttle valve constant, so that the flow of the pump is kept constant; when the pressure difference is increased, the pump swings back towards the small displacement, and when the pressure difference is reduced, the pump swings back towards the large displacement until the pressure difference at the two ends of the throttle valve is restored to the set value, so that the flow of the pump is restored to the set value.
The common load sensitive valves in the market at present, such as in the patents with patent application numbers of CN202021741604.9 and CN202020481311.5, have high valve core processing precision and require heat treatment for both the valve core and the valve body; in another patent with the patent application number of CN201320825991.8, although a valve sleeve and valve core structure is adopted, the damping hole is assembled on the valve body, the oil path is complex, the processing precision of the valve core is high, and the valve core of the load sensitive valve is limited by the screw, so that the volume of the valve body is increased, the volume of the pump is increased, and the installation space of the host is increased.
Among the engineering machines, the crawler machine is widely used for mechanical construction of engineering such as transportation, hydraulic engineering, mining and the like. The hydraulic system is generally connected in parallel by a hydraulic double pump to provide hydraulic energy, and the hydraulic double pump is generally controlled by constant power. The dual pump power valve is required to be combined with load-sensitive control to enable the pump to provide a high flow rate to the actuator during the low pressure phase to increase efficiency.
If the load sensitive valve is assembled on the power valve by adopting any one of the three patents, an installation space needs to be reserved outside the valve body; meanwhile, the load sensitive valve structure of any one of the first two of the three patents is integrated in the power valve body, and the valve body is required to be subjected to heat treatment, so that the valve body is large in size and extremely high in cost; the load sensitive valve structure of the third patent is integrated in the valve body of the power valve, so that the internal oil way structure of the valve body is complex, the processing difficulty is high, and meanwhile, the processing precision requirement of the valve core is high, and the cost is extremely high.
Therefore, the prior art has the problems of larger installation space, large processing difficulty and higher cost.
Disclosure of Invention
The invention aims to provide a load sensitive valve with compact structure. The invention has the characteristics of effectively reducing the installation space, reducing the processing difficulty and reducing the production cost.
The technical scheme of the invention is as follows: a compact load sensitive valve comprises a valve sleeve arranged in a valve body of a pump power valve, wherein a valve core is arranged in the valve sleeve; the valve further comprises a threaded sleeve arranged at the tail end of the valve body of the pump power valve, a large spring seat and a small spring seat are sequentially arranged in the threaded sleeve from front to back, the large spring seat is in smooth spherical surface positioning fit with the tail end of the valve core, the tail end of the small spring seat is connected with a pressure regulating screw, and a sealing lock nut is further arranged on the pressure regulating screw; a small spring is arranged between the large spring seat and the small spring seat, and a large spring is arranged between the large spring seat and the screw sleeve; the inside of case front end still is equipped with the damping plug.
In the load sensitive valve with the compact structure, the front end of the screw sleeve is provided with the radial semicircular hole.
In the compact-structure load-sensitive valve, a first P cavity is arranged between the front ends of the valve core and the valve sleeve and the valve body of the pump power valve; and a second P cavity is arranged between the tail ends of the valve sleeve and the valve core, the front end of the screw sleeve and the valve body of the pump power valve.
In the load sensitive valve with the compact structure, the cavity A, the cavity B, the cavity T and the cavity X are sequentially arranged in the valve body of the pump power valve from front to back; the cavity A is matched with an oil outlet of the pump, the cavity B is communicated with a rodless cavity of the variable piston, and the cavity T is communicated with an oil return cavity; the X cavity is communicated with an oil outlet of the pump through a throttle valve.
In the compact-structure load-sensitive valve, the position of the X cavity corresponds to that of the second P cavity.
In the compact-structure load-sensitive valve, the valve sleeve comprises a valve sleeve body, wherein a radial hole A, a radial hole B and a radial hole T are sequentially formed in the valve sleeve body from front to back; an annular groove is formed in the inner wall surface of the radial B hole; the tail end of the valve sleeve body is provided with a limit step matched with the valve body of the pump power valve.
In the compact-structure load-sensitive valve, the valve core comprises a valve core body, wherein the front end of the valve core body is provided with an axial c cavity, and the valve core body is provided with a radial a hole matched with the axial c cavity; the middle part of the valve core body is provided with an annular control step; the annular control step is matched with the annular groove.
In the compact-structure load-sensitive valve, the two ends of the annular control step are also provided with inclined chamfers.
In the compact-structure load-sensitive valve, the tail end of the valve core body is also provided with the pressure equalizing groove.
In the load-sensitive valve with a compact structure, the damping plug is provided with a damping hole.
Compared with the prior art, the valve sleeve valve core structure is adopted, and the valve sleeve valve core structure is arranged in the valve body of the pump power valve; in the valve body of the pump power valve, a load sensitive valve is integrated, an oil way is designed to lead oil from the outlet of the pump to the cavity A, and lead oil from the rodless cavity of the variable piston to the cavity B, and the cavity T is communicated with the oil return cavity; when the pump does not work, the cavity B is communicated with the cavity T, oil in the variable piston rodless cavity of the pump is communicated with oil, and the pump is in large discharge capacity; when the pump is in operation, the load sensing valve compares the pressure before and after the throttle valve and keeps the differential pressure of the throttle valve constant, thereby keeping the flow of the pump constant. When the pressure difference is increased, the valve core moves right, the cavity A is communicated with the cavity B, oil enters the rodless cavity of the piston, and the piston pushes the pump to swing back towards small displacement; when the pressure difference is reduced, the valve core moves leftwards, the cavity A is blocked from being communicated with the cavity B, the cavity B is communicated with the cavity T, the piston does not have rod cavity oil return, the piston pushes the pump to swing back towards the large displacement until the pressure difference at two ends of the throttle valve is restored to a set value, and the flow of the pump is restored to the set value.
By adopting the structure, the device has the following advantages:
1. the load sensitive valve is arranged in the valve body of the pump power valve, the structure of the pump is not changed, the additional reserved installation space of the host is not needed, the installation space of the host is not occupied, the installation space is greatly reduced, and the cost of the host is reduced; only the valve core and the valve sleeve are required to be subjected to heat treatment, and the valve body does not need to be subjected to heat treatment, so that the cost can be further reduced. Meanwhile, the load sensitive valve is arranged in the valve body, the original design of the pump is not changed, the installation of a host is convenient, and the valve has the characteristics of small volume, compact structure, high integration level and low cost; and the different pressure differences of the throttle valve can be matched by adjusting the pretightening force of the spring according to the specific requirements of customers, so that the market competitiveness is strong.
2. The internal oil duct of the load sensitive valve is simple, has a simple structure, is easy to process and has low cost.
3. The two ends of the annular control step of the valve core are provided with inclined chamfers, so that the valve core structure is simplified, the processing difficulty is reduced, and the processing cost is reduced.
4. And a pressure equalizing groove is added on the valve core, so that the risk of clamping stagnation of the valve core in the valve sleeve is reduced.
5. The damping hole is integrated on the valve core, so that hydraulic impact is reduced, meanwhile, the oil way of the valve body is reduced, and the processing cost is reduced.
6. The valve sleeve is a revolution body, does not need a special clamp, is easy to process and has low cost.
In conclusion, the invention has the characteristics of effectively reducing the installation space, reducing the processing difficulty and reducing the production cost.
Drawings
FIG. 1 is a longitudinal cross-sectional view of the present invention;
FIG. 2 is a longitudinal cross-sectional view of a load-sensitive valve housing;
FIG. 3 is a longitudinal cross-sectional view of a load-sensitive valve cartridge;
FIG. 4 is a longitudinal cross-sectional view of a damping plug;
fig. 5 is a schematic diagram of the operation of the present invention.
The marks in the drawings are: 1-pump, 2-variable piston, 3-power valve, 4-throttle valve, 5-pilot valve, 6-load sensitive valve; 61-pump power valve body, 62-damping plug, 63-valve core, 64-valve sleeve, 65-large spring seat, 66-large spring, 67-small spring, 68-small spring seat, 69-pressure regulating screw, 610-sealing lock nut, 611-screw sleeve, 612-radial semicircle orifice, 613-first P chamber, 614-second P chamber, 615-A chamber, 616-B chamber, 617-T chamber, 618-X chamber, 641-valve sleeve body, 642-radial A orifice, 643-radial B orifice, 644-radial T orifice, 645-annular groove, 646-limiting step, 631-valve core body, 632-axial c chamber, 633-radial a orifice, 634-annular control step, 635-inclined chamfer, 636-pressure equalizing groove, 621-damping orifice.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples. The compact load sensitive valve is formed as shown in fig. 1 to 5, and comprises a valve sleeve 64 arranged in a valve body 61 of a pump power valve, and a valve core 63 is arranged in the valve sleeve 64; the valve further comprises a threaded sleeve 611 arranged at the tail end of the valve body 61 of the pump power valve, a large spring seat 65 and a small spring seat 68 are sequentially arranged in the threaded sleeve 611 from front to back, the large spring seat 65 is matched with the tail end of the valve core 63 in a smooth spherical surface positioning manner, the tail end of the small spring seat 68 is connected with a pressure regulating screw 69, and a sealing lock nut 610 is further arranged on the pressure regulating screw 69; a small spring 67 is arranged between the large spring seat 65 and the small spring seat 68, and a large spring 66 is arranged between the large spring seat 65 and the screw sleeve 611; the front end of the valve core 63 is also provided with a damping plug 62.
The front end of the screw sleeve 611 is provided with a radial semicircle hole 612.
A first P cavity 613 is arranged between the front ends of the valve core 63 and the valve sleeve 64 and the pump power valve body 61; a second P-chamber 614 is provided between the tail ends of the valve sleeve 64 and the spool 63, the front end of the screw sleeve 611 and the pump power valve body 61.
An A cavity 615, a B cavity 616, a T cavity 617 and an X cavity 618 are sequentially arranged in the pump power valve body 61 from front to back; the A cavity 615 is communicated with an oil outlet of the pump 1, the B cavity 616 is communicated with a rodless cavity of the variable piston 2, and the T cavity 617 is communicated with an oil return cavity; the X cavity 618 is communicated with the oil outlet of the pump 1 through a throttle valve 4.
The X-cavity 618 corresponds in position to the second P-cavity 614.
The valve sleeve 64 comprises a valve sleeve body 641, wherein a radial A hole 642, a radial B hole 643 and a radial T hole 644 are sequentially formed in the valve sleeve body 641 from front to back; an annular groove 645 is arranged on the inner wall surface of the radial B hole 643; the tail end of the valve housing body 641 is provided with a limit step 646 which is matched with the pump power valve body 61.
The valve core 63 comprises a valve core body 631, an axial c cavity 632 is arranged at the front end of the valve core body 631, and a radial a hole 633 communicated with the axial c cavity 632 is arranged on the valve core body 631; the middle part of the valve core body 631 is provided with an annular control step 634; the annular control step 634 mates with the annular groove 645.
The annular control step 634 is also provided with an inclined chamfer 635 at both ends.
The tail end of the valve core body 631 is also provided with a pressure equalizing groove 636.
The damping plug 62 is provided with a damping hole 621.
The front end inclined chamfer of the annular control step is N1, and the rear end inclined chamfer of the annular control step is N2.
The front end of the annular groove is M1, and the rear end of the annular groove is M2.
The valve sleeve is also provided with a threaded hole, so that the valve sleeve is convenient to assemble, easy to interchange and easy to maintain.
The front end corresponds to the left end in the figure, and the rear end corresponds to the tail end in the figure.
The valve sleeve 64 is matched with the cylindrical surface of the valve body 61 of the pump power valve to form cylindrical surface seal; the valve core 63 is in cylindrical surface fit with the valve sleeve 64 to form cylindrical surface sealing, and the valve body 61, the valve sleeve 64 and the valve core 63 are in cylindrical surface sealing to form a sealing cavity (a first P cavity); the damping screw plug 62 is in threaded connection with the valve core 63; the screw sleeve 611 is screwed with the valve body 61 and is inserted into the valve body 61. The large spring seat 65 is matched with the spool 63 in a smooth spherical surface positioning way, the small spring seat 68 is positioned by a pressure regulating screw 69, the small spring 67 is positioned by the large spring seat 65 and the small spring seat 68 respectively, and the small spring 67 is assembled between the large spring seat 65 and the small spring seat 68; the large spring 66 is positioned by the threaded sleeve 611 and the large spring seat 65, and is assembled between the threaded sleeve 611 and the large spring seat 65. The pretightening force of the big spring 66 and the small spring 67 is regulated by the pressure regulating screw.
The valve sleeve 64 is positioned by a limiting step at the right end in the drawing, and is blocked on the valve body 61 under the action of the threaded sleeve, and cannot move left and right.
The valve body 61, the valve sleeve 64, the valve element 63, and the screw sleeve 611 form a seal chamber (second P chamber).
When the pump is not in operation, the valve core 63 is attached to the bottom of the valve body 61, and the valve is shown in a separated state for convenience in description of the operation principle of the valve, and the positions of the other parts are shown in fig. 1.
The two pump power valve bodies of the duplex pump are provided with the load sensitive valve. Because the configuration of the other pump of the tandem pump is a symmetrical configuration, only the control of one pump will be described for ease of description of the principle.
Working principle:
the working principle of the throttle valve is as follows: when the oil passes through, pressure loss is generated, namely, a certain pressure difference exists between the front and the back of the throttle valve; the magnitude of the pressure difference is only related to the magnitude of the flow rate and is not related to the magnitude of the pressure on the premise that the opening shape and the opening degree of the throttle valve and the viscosity of the oil are unchanged. Conversely, if the differential pressure across the throttle is maintained constant, the flow through the throttle remains constant regardless of the pressure change.
Load-sensitive valve theory of operation:
when the pump is not in operation, the valve core 63 is pressed against the bottom end (i.e., the front end) of the valve body 61 by the large spring 66 and the small spring 67. At this time, the end of the annular control step N1 of the valve core 63 and the end of the annular groove M1 of the valve sleeve 64 form a positive cover to block the communication between the cavity A and the cavity B; the N2 end of the annular control land of the spool 63 forms a positive opening with the M2 side of the annular groove of the valve sleeve 64, communicating the B chamber with the T chamber. Namely, the variable piston rodless cavity is communicated with the oil return cavity, and the pump is in large displacement.
When the pump starts to work, pump outlet pressure oil enters an axial c cavity of the valve core 63 through an A cavity of the valve body 61, a radial A hole of the valve sleeve 64 and a radial a hole of the valve core 63, then enters a first P cavity through a damping hole of the damping plug 62 and acts on the left end face of the valve core 63; simultaneously, the pump outlet pressure oil enters the second P cavity through the throttle valve 4, the X cavity of the valve body 61 and the radial semicircular hole on the screw sleeve 611 and acts on the right end face of the valve core 63. The pressure applied to the spool 63 by the throttle action of the throttle valve 4 is the pressure difference, and the spool 63 receives the urging force of the large spring 66 and the small spring 67.
The pressure regulating screw 69 is adjusted so that the pre-tightening force of the large spring 66 and the small spring 67 is equal to the acting force (the pressure difference is the product of the cylindrical surface area of the valve core 63) of the pressure oil acting on the valve core 63. At this time, when the pump speed increases or the pressure decreases to cause the outlet flow of the pump to increase, the pressure difference between the front and rear of the throttle valve 4 increases, the valve core 63 moves rightward, the annular control step N1 end of the valve core 63 and the annular groove M1 end of the valve sleeve 64 form a positive opening, and simultaneously the annular control step N2 end of the valve core 63 and the annular groove M2 end of the valve sleeve 64 form a positive cover, so that the cavity a is communicated with the cavity B, and the cavity B is blocked from being communicated with the cavity T; the pressure oil passes through the A cavity of the valve body 61, the radial A hole and the radial B hole of the valve sleeve 64 enter the B cavity and then enter the rodless cavity of the variable piston, the rodless cavity of the variable piston is pushed to swing towards a small angle, the outlet flow is reduced to a set value, the pressure difference between the front side and the rear side of the throttle valve is reduced to the set value, and the valve core 63 moves leftwards to return. When the rotational speed decreases or the pressure increases to cause a decrease in the outlet flow rate of the pump, the operation is reversed. The valve core 63 moves leftwards under the action of spring force, and the end of the annular control step N1 of the valve core 63 and the end of the annular groove M1 of the valve sleeve 64 form positive coverage to block the communication between the cavity A and the cavity B; the annular control land N2 end of the valve core 63 and the annular groove M2 end of the valve sleeve 64 form a positive opening, so that the cavity B is communicated with the cavity T. The oil in the rodless cavity of the variable piston passes through the cavity B of the valve body, radial holes B and T of the valve sleeve enter the cavity T of the valve body 61, the variable piston returns to swing to a large angle, and the outlet flow is increased to a regulated value. The differential pressure across the throttle valve increases to a set value, whereupon the spool 63 moves back to the right.
It should be noted that there is no obvious sectioning action in actual operation, because the spool 63 is sensitive to follow-up, and is always in a dynamic balance state, and maintains a certain opening degree.
In summary, the load sensitive valve is used for receiving the pressure difference information from the throttle valve and converting the pressure difference into a certain opening degree, so as to control the swing angle of the variable piston 2, indirectly control the outlet flow of the pump, and finally correct the pressure difference to a constant value to ensure that the outlet flow of the pump is a constant value.
When different requirements are made on the pressure difference of the load sensitive valve by customers, the pre-tightening force of the big spring 66 and the small spring 67 can be adjusted through the pressure adjusting screw 69.
Claims (4)
1. A compact load-sensitive valve, characterized in that: comprises a valve sleeve (64) arranged in a valve body (61) of the pump power valve, and a valve core (63) is arranged in the valve sleeve (64); the valve further comprises a threaded sleeve (611) arranged at the tail end of the valve body (61) of the pump power valve, a large spring seat (65) and a small spring seat (68) are sequentially arranged in the threaded sleeve (611) from front to back, the large spring seat (65) is in smooth spherical surface positioning fit with the tail end of the valve core (63), the tail end of the small spring seat (68) is connected with a pressure regulating screw (69), and a sealing lock nut (610) is further arranged on the pressure regulating screw (69); a small spring (67) is arranged between the large spring seat (65) and the small spring seat (68), and a large spring (66) is arranged between the large spring seat (65) and the screw sleeve (611); a damping plug (62) is further arranged in the front end of the valve core (63); the front end of the screw sleeve (611) is provided with a radial semicircular hole (612); a first P cavity (613) is arranged between the front ends of the valve core (63) and the valve sleeve (64) and the pump power valve body (61); a second P cavity (614) is arranged between the tail ends of the valve sleeve (64) and the valve core (63) and the front end of the screw sleeve (611) and the pump power valve body (61); an A cavity (615), a B cavity (616), a T cavity (617) and an X cavity (618) are sequentially arranged in the pump power valve body (61) from front to back; the cavity A (615) is matched with an oil outlet of the pump (1), the cavity B (616) is communicated with an oil outlet of a rodless cavity of the variable piston (2), and the cavity T (617) is communicated with an oil return cavity; the X cavity (618) is communicated with an oil outlet of the pump (1) through a throttle valve (4); the X cavity (618) corresponds to the second P cavity (614);
the valve sleeve (64) comprises a valve sleeve body (641), wherein a radial A hole (642), a radial B hole (643) and a radial T hole (644) are sequentially formed in the valve sleeve body (641) from front to back; an annular groove (645) is formed in the inner wall surface of the radial B hole (643); the tail end of the valve sleeve body (641) is provided with a limit step (646) matched with the valve body (61) of the pump power valve;
the valve core (63) comprises a valve core body (631), an axial c cavity (632) is arranged at the front end of the valve core body (631), and a radial a hole (633) matched with the axial c cavity (632) is arranged on the valve core body (631); an annular control step (634) is arranged in the middle of the valve core body (631); the annular control step (634) mates with the annular groove (645).
2. A compact load sensing valve as defined in claim 1, wherein: the two ends of the annular control step (634) are also provided with inclined chamfers (635).
3. A compact load sensing valve as defined in claim 1, wherein: the tail end of the valve core body (631) is also provided with a pressure equalizing groove (636).
4. A compact load sensing valve as defined in claim 1, wherein: and the damping plug (62) is provided with a damping hole (621).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110922210.6A CN113623284B (en) | 2021-08-12 | 2021-08-12 | Compact structure type load sensitive valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110922210.6A CN113623284B (en) | 2021-08-12 | 2021-08-12 | Compact structure type load sensitive valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113623284A CN113623284A (en) | 2021-11-09 |
| CN113623284B true CN113623284B (en) | 2024-02-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234992A (en) * | 2013-11-20 | 2014-12-24 | 江苏恒立液压有限公司 | Plunger pump power control device and control method thereof |
| CN205423370U (en) * | 2015-12-16 | 2016-08-03 | 重庆红江机械有限责任公司 | Can realize constant voltage control's sensitive valve of load |
| CN215830837U (en) * | 2021-08-12 | 2022-02-15 | 力源液压（苏州）有限公司 | Compact structure type load sensitive valve |
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- 2021-08-12 CN CN202110922210.6A patent/CN113623284B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234992A (en) * | 2013-11-20 | 2014-12-24 | 江苏恒立液压有限公司 | Plunger pump power control device and control method thereof |
| CN205423370U (en) * | 2015-12-16 | 2016-08-03 | 重庆红江机械有限责任公司 | Can realize constant voltage control's sensitive valve of load |
| CN215830837U (en) * | 2021-08-12 | 2022-02-15 | 力源液压（苏州）有限公司 | Compact structure type load sensitive valve |
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| CN113623284A (en) | 2021-11-09 |
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Address after: No.29 Caohu Avenue, Xiangcheng District, Suzhou City, Jiangsu Province Applicant after: Suzhou Liyuan Hydraulic Co.,Ltd. Address before: 29 Caohu Avenue, Xiangcheng District, Suzhou, Jiangsu Province Applicant before: LIYUAN HYDRAULIC (SUZHOU) Co.,Ltd. |
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