CN111692154A - Speed limiting valve - Google Patents

Speed limiting valve Download PDF

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Publication number
CN111692154A
CN111692154A CN202010585179.7A CN202010585179A CN111692154A CN 111692154 A CN111692154 A CN 111692154A CN 202010585179 A CN202010585179 A CN 202010585179A CN 111692154 A CN111692154 A CN 111692154A
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CN
China
Prior art keywords
cavity
speed
valve
limiting
limiting valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010585179.7A
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Chinese (zh)
Inventor
周东才
盘俊
陈继勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sany Marine Heavy Industry Co Ltd
Original Assignee
Sany Marine Heavy Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sany Marine Heavy Industry Co Ltd filed Critical Sany Marine Heavy Industry Co Ltd
Priority to CN202010585179.7A priority Critical patent/CN111692154A/en
Publication of CN111692154A publication Critical patent/CN111692154A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/52—Means for additional adjustment of the rate of flow
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
    • 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
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Sliding Valves (AREA)

Abstract

The application relates to speed limit valve technical field especially relates to a speed limit valve, and the speed limit valve includes: the speed limiting valve comprises a speed limiting valve body and a throttle valve core; a first cavity is arranged in the speed limiting valve body, and a valve core of the speed limiting valve is arranged in the first cavity; the valve core of the speed limiting valve is internally provided with a second cavity, and the throttle valve core is arranged in the second cavity; the second cavity comprises a third cavity and a fourth cavity which are communicated with each other, and the third cavity is close to the valve core of the speed limiting valve; the radial section area of the third cavity is smaller than that of the fourth cavity; so that the flow rate of the hydraulic oil when the throttle valve spool is positioned in the fourth cavity is larger than that when the throttle valve spool is positioned in the third cavity; when the load weight is small, the valve core of the throttle valve can move from the third cavity to the fourth cavity, namely the flow area of hydraulic oil is increased, the flow resistance of the hydraulic oil is reduced, so that the flow of the hydraulic oil is increased, and the fork or the load can fall rapidly along with the increase of the flow of the hydraulic oil.

Description

Speed limiting valve
Technical Field
The application relates to the technical field of speed limiting valves, in particular to a speed limiting valve with a low-pressure compensation function.
Background
The speed limiting valve is a common valve in a hydraulic control system and is widely applied to lifting and descending of a fork of a forklift.
An orifice is formed between a valve core of the speed-limiting valve and a valve core of a throttle valve, and as is well known, the orifice determines the size of the speed-limiting flow, however, the existing orifice is a fixed orifice, the set flow pressure is generally above 5MPa, but when the load pressure is smaller, for example, in the models of a two-stage free portal frame or a light fork, the speed-limiting valve cannot reach the larger speed-limiting flow due to the light load weight and the small pressure, so that the portal frame or the fork can descend slowly under the self-weight under the no-load working condition.
Therefore, there is a need for a speed limiting valve with low pressure compensation function, which solves the technical problems in the prior art to a certain extent.
Disclosure of Invention
The utility model provides a speed-limiting valve has solved to a certain extent that exists among the prior art when load pressure is less, and the technical problem of speed-limiting valve can't reach great speed-limiting flow.
The application provides a speed limiting valve for among the hydraulic control system, include: the speed limiting valve comprises a speed limiting valve body and a throttle valve core;
a first cavity is arranged in the speed limiting valve body, and a valve core of the speed limiting valve is arranged in the first cavity; the valve core of the speed limiting valve is internally provided with a second cavity, and the valve core of the throttle valve is arranged in the second cavity;
the second cavity comprises a third cavity and a fourth cavity which are communicated with each other, the radial cross-sectional area of the third cavity is smaller than that of the fourth cavity, and the flow rate of hydraulic oil when the throttle valve core is positioned in the fourth cavity is larger than that when the throttle valve core is positioned in the third cavity;
the throttle valve spool is movable from the third cavity to the fourth cavity to increase a flow rate of the hydraulic oil flowing out of the throttle valve spool.
In the above technical solution, further, the third cavity and the fourth cavity are communicated by a transition portion.
In the above technical solution, further, the transition portion is of any one of a trapezoidal structure, an arc structure, or a slope-shaped structure.
In the above technical solution, further, the speed-limiting valve body includes a speed-limiting valve body, a speed-limiting elastic member, and an adjusting lever;
the first cavity is formed in the valve body of the speed-limiting valve, the side wall of the valve body of the speed-limiting valve is provided with a valve body oil passing hole of the speed-limiting valve, and the side wall of the third cavity is provided with a valve core oil passing hole of the speed-limiting valve;
one end of the regulating rod is arranged on the valve core of the speed limiting valve, the other end of the regulating rod extends to extend out of the second cavity along the axial direction of the valve body of the speed limiting valve and forms a fixing part, and the fixing part is connected with a load;
the speed-limiting elastic piece is sleeved on the part of the adjusting rod extending out of the second cavity, and the load can compress the speed-limiting elastic piece.
In the above technical solution, further, the throttle valve spool includes a sliding portion and a limiting portion connected to the sliding portion, and the limiting portion protrudes from the sliding portion along a radial direction of the second cavity;
the limiting part and the sliding part are sleeved on the adjusting rod and can slide along the adjusting rod.
In the above technical solution, further, the sliding device further comprises a throttling elastic member, wherein the throttling elastic member is sleeved on the sliding part;
the limiting part can move from the third cavity to the fourth cavity under the action of the throttling elastic piece.
In the technical scheme, further, the bottom wall of the valve core of the speed limiting valve is provided with an adjusting hole;
the adjusting hole is communicated with the first cavity and the second cavity, so that the hydraulic oil in the first cavity sequentially passes through the adjusting hole, the valve element oil passing hole of the speed-limiting valve and the valve body oil passing hole of the speed-limiting valve to flow out.
In the above technical scheme, the speed limiting valve further comprises a clamp spring, wherein the clamp spring is arranged between the valve core of the speed limiting valve and the valve body of the speed limiting valve and is used for fixing the valve core of the speed limiting valve on the valve body of the speed limiting valve.
In the above technical solution, further, an orifice is provided on a side wall of the fourth cavity.
In the technical scheme, furthermore, a threaded part is arranged on the outer side wall of the valve body of the speed limiting valve, and the threaded part is used for connecting the speed limiting valve body to a workpiece.
Compared with the prior art, the beneficial effect of this application is:
the application provides a speed limiting valve for among the hydraulic control system, include: the speed limiting valve comprises a speed limiting valve body and a throttle valve core; a first cavity is arranged in the speed limiting valve body, and a valve core of the speed limiting valve is arranged in the first cavity; the valve core of the speed limiting valve is internally provided with a second cavity, and the valve core of the throttle valve is arranged in the second cavity; the second cavity comprises a third cavity and a fourth cavity which are communicated with each other, the diameter of the section of the third cavity in the radial direction is smaller than that of the section of the fourth cavity in the radial direction, and the flow rate of hydraulic oil when the throttle valve spool is positioned in the fourth cavity is larger than that when the throttle valve spool is positioned in the third cavity;
when the load weight is small, the throttle valve spool can move from the third cavity to the fourth cavity to increase the flow rate of the hydraulic oil flowing out of the throttle valve spool.
Specifically, as shown in fig. 1, when the reverse operating condition (B to F), that is, the deadweight of the fork is lowered, hydraulic oil enters from the port B and is subjected to resistance of the throttle valve core, so that the throttle valve core is pushed into the third cavity, but when the fork is lowered in an unloaded state or the load is light and the pressure is small, the throttle valve core moves from the third cavity to the fourth cavity, and when the throttle valve core is located in the fourth cavity, since the diameter of the radial cross section of the fourth cavity is larger than that of the radial cross section of the third cavity, that is, the flow area of the hydraulic oil is increased, the flow resistance of the hydraulic oil is reduced, so that the flow rate of the hydraulic oil is increased, and as the flow rate of the hydraulic oil is increased, the fork or the load is rapidly lowered.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a speed limiting valve according to an embodiment of the present disclosure;
fig. 2 is an enlarged view of a first structure of a third cavity and a fourth cavity connected to a speed-limiting valve provided in the second embodiment of the present application;
fig. 3 is an enlarged view of a first structure of a third cavity and a fourth cavity connected to a speed-limiting valve according to a second embodiment of the present application;
fig. 4 is an enlarged view of a second structure of the third cavity and the fourth cavity connected to the speed limiting valve provided in the third embodiment of the present application;
fig. 5 is an enlarged view of a third structure in which a third cavity and a fourth cavity are connected to each other on the speed limiting valve according to the fourth embodiment of the present application.
Reference numerals:
100-speed limiting valve body; 101-a throttle valve spool; 102-a first cavity; 103-valve core of the speed limiting valve; 104-a second cavity; 105-a third cavity; 106-a fourth cavity; 107-valve body of speed limiting valve; 108-a rate-limiting elastic member; 109-adjusting rod; 110-a slide; 111-a limiting part; 112-a throttling elastic member; 113-a valve core oil passing hole of the speed limiting valve; 114-oil passing holes of the valve body of the speed limiting valve; 115-clamp spring; 116-orifice; 117-a threaded portion; 118-a transition; 119-a conditioning well; 120-first direction.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example one
Referring to fig. 1, the present application provides a speed limiting valve for use in a hydraulic control system, including: a speed limiting valve body 100 and a throttle valve core 101;
a first cavity 102 is formed in the speed-limiting valve body 100, and a valve core 103 of the speed-limiting valve is arranged in the first cavity 102; a second cavity 104 is arranged in the valve core 103 of the speed limiting valve, and the throttle valve core 101 is arranged in the second cavity 104;
the second cavity 104 comprises a third cavity 105 and a fourth cavity 106 which are communicated with each other, and the third cavity 105 is close to the valve core 103 of the speed limiting valve; the diameter of the cross section of the third cavity 105 in the radial direction is smaller than the diameter of the cross section of the fourth cavity 106 in the radial direction; so that the flow rate of hydraulic oil when the throttle valve spool 101 is located in the fourth chamber 106 is larger than the flow rate of hydraulic oil when the throttle valve spool 101 is located in the third chamber 105;
when the load weight is small, the throttle valve spool 101 can move from the third chamber 105 to the fourth chamber 106 to increase the flow rate of the hydraulic oil.
Specifically, as shown in fig. 1, when the reverse operation (from the B end to the F end) is performed, that is, when the fork descends due to its own weight, hydraulic oil enters from the B port and is subjected to resistance of the throttle valve core 101, so that the throttle valve core 101 is pushed into the third cavity 105, but when the fork descends due to its own weight when the fork is unloaded or has a light load and a pressure is low, the throttle valve core 101 moves from the third cavity 105 to the fourth cavity 106, and when the throttle valve core 101 is located in the fourth cavity 106, since the diameter of the radial cross section of the fourth cavity 106 is larger than that of the radial cross section of the third cavity 105, that is, the flow area of the hydraulic oil is increased, so that the flow rate of the hydraulic oil flowing from the B port is increased, and as the flow rate of the hydraulic oil is increased, the fork or the load can rapidly fall.
The above-mentioned flow area is further explained: with reference to fig. 2, the third cavity 105 and the fourth cavity 106 are both cylindrical, wherein the diameter of the third cavity 105 is D1, the diameter of the position-limiting portion 111 is D2, and the diameter of the fourth cavity 106 is D3, and when the position-limiting portion 111 is located in the third cavity 105, the flow area is a cross-sectional difference area between the cross-sectional area of the third cavity 105 and the cross-sectional area of the position-limiting portion 111, that is, an annular area formed by the cross-sections D1-D2; when the position-limiting part 111 is located in the fourth cavity 106, the flow area is the difference area between the cross-sectional area of the fourth cavity 106 and the cross-sectional area of the position-limiting part 111, that is, the annular area formed by the sections D3-D2; as can be seen from the figure: d3> D2 that is, when the throttle spool 101 is located in the fourth chamber 106, the flow area of the hydraulic oil is increased so that the flow rate of the hydraulic oil flowing from the B port is increased, and the fork or the load drops rapidly as the flow rate of the hydraulic oil is increased.
In this embodiment, the speed limit valve body 100 includes a speed limit valve body 107, a speed limit elastic member 108, and an adjusting lever 109;
the first cavity 102 is arranged on the valve body 107 of the speed limiting valve, one end of the adjusting rod 109 is arranged on the valve core 103 of the speed limiting valve, and the other end of the adjusting rod extends out of the second cavity 104 to form a fixing part, and the fixing part is connected with the load.
The speed-limiting elastic member 108 is sleeved on the adjusting rod 109 extending out of the second cavity 104, and the load acts on the speed-limiting elastic member 108 to compress the speed-limiting elastic member 108.
Specifically, the bottom wall of the valve core 103 of the speed limiting valve is provided with an adjusting hole 119; the adjusting hole 119 is communicated with the first cavity 102 and the second cavity 104, and a valve core oil passing hole 113 of a speed limiting valve is formed in the side wall of the third cavity 105; the side wall of the speed-limiting valve body 107 is provided with a speed-limiting valve body oil passing hole 114; when the speed-limiting elastic member 108 is compressed by a load, hydraulic oil in the first cavity 102 flows out through the adjusting hole 119, the second cavity 104, the speed-limiting valve spool oil passing hole 113 and the speed-limiting valve body oil passing hole 114.
Preferably, the speed-limiting elastic member 108 is a speed-limiting spring.
In this embodiment, the throttle valve body 101 includes a slide portion 110 and a stopper portion 111; the limiting part 111 is arranged at one end of the sliding part 110; the limiting part 111 protrudes from the sliding part 110; the limiting portion 111 and the sliding portion 110 are sleeved on the adjusting rod 109 and can slide along the adjusting rod 109.
Specifically, the throttle valve spool 101 further includes a throttle elastic member 112, the throttle elastic member 112 is sleeved on the sliding portion 110, and one end of the throttle elastic member 112 is fixed on the bottom wall of the speed limit valve spool 103, and the other end of the throttle elastic member is fixed on the limiting portion 111.
In the actual working process, the first dynamic balancing process: when a load presses the speed-limiting elastic member 108, the speed-limiting valve spool 103, the adjusting rod 109, the throttle valve spool 101 and the throttle elastic member 112 are regarded as an integral structure, at this time, the integral structure can move along a first direction 120 under the action of the speed-limiting elastic member 108, and the pressure of the load acting on the integral structure through the speed-limiting elastic member 108 and the elastic force of the speed-limiting elastic member 108 form a pair of balance forces; and at this time, the throttle valve core 101 can press the throttle elastic member 112; the second dynamic balance process: when the load is smaller, the pressure applied to the speed-limiting elastic member 108 by the load is smaller, the valve element 103 of the speed-limiting valve and the adjusting rod 109 are kept still, the throttling elastic member 112 stretches to drive the limiting part 111 to move from the third cavity 105 to the fourth cavity 106, when the limiting part 111 is located in the fourth cavity 106, the flow area of the hydraulic oil is increased, the flow resistance of the hydraulic oil is reduced, so that the flow of the hydraulic oil is increased, and the load can fall rapidly along with the increase of the flow of the hydraulic oil.
In this embodiment, in order to facilitate the detachment and installation of the throttle valve spool 101 and the speed-limiting valve spool 103, the speed-limiting valve further includes a snap spring 115, and the snap spring 115 is disposed between the speed-limiting valve spool 103 and the speed-limiting valve body 107 and is used for fixing the speed-limiting valve spool 103 on the speed-limiting valve body 107.
In this embodiment, the side wall of the fourth cavity 106 is provided with an orifice 116, and the orifice 116 is used for achieving a steady state of the hydraulic oil in the limiting valve, and a specific steady state principle is a kind of prior art, and those skilled in the art can understand that the explanation and the explanation are not made herein too much, and the explanation is not made specifically.
In this embodiment, a threaded portion 117 is provided on an outer side wall of the speed limit valve body 107, and the threaded portion 117 is used to connect the speed limit valve body 100 to a workpiece.
Specifically, the threaded portion 117 may be any one of a triangular thread, a rectangular thread, a trapezoidal thread, or a buttress thread in its cross-sectional shape.
Example two
The second embodiment is an improvement on the basis of the first embodiment, technical contents disclosed in the first embodiment are not described repeatedly, and contents disclosed in the second embodiment also belong to contents disclosed in the first embodiment.
As shown in fig. 3, the third cavity 105 is communicated with the fourth cavity 106 by a transition portion 118, and the transition portion 118 is a trapezoid structure.
EXAMPLE III
The third embodiment is an improvement on the third embodiment, technical contents disclosed in the third embodiment are not described repeatedly, and the contents disclosed in the third embodiment also belong to the contents disclosed in the third embodiment.
As shown in fig. 4, the third cavity 105 is communicated with the fourth cavity 106 by a transition portion 118, and the transition portion 118 is an arc-shaped structure.
Example four
The fourth embodiment is an improvement on the basis of the fourth embodiment, technical contents disclosed in the fourth embodiment are not described repeatedly, and the contents disclosed in the fourth embodiment also belong to the contents disclosed in the fourth embodiment.
Referring to fig. 5, the third cavity 105 and the fourth cavity 106 are communicated by a transition portion 118, and the transition portion 118 is a slope-shaped structure.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A speed limiting valve used in a hydraulic control system is characterized by comprising: a speed limiting valve body (100) and a throttle valve core (101);
a first cavity (102) is formed in the speed-limiting valve body (100), and a speed-limiting valve core (103) is arranged in the first cavity (102); a second cavity (104) is formed in the valve core (103) of the speed limiting valve, and the throttle valve core (101) is arranged in the second cavity (104);
the second cavity (104) comprises a third cavity (105) and a fourth cavity (106) which are communicated with each other, and the cross-sectional area of the third cavity (105) in the radial direction is smaller than that of the fourth cavity (106) in the radial direction;
the throttle valve spool (101) is movable from the third cavity (105) to the fourth cavity (106) to increase the flow rate of the hydraulic oil flowing out of the throttle valve spool (101).
2. The speed limit valve of claim 1, wherein the third cavity (105) is in communication with the fourth cavity (106) via a transition (118).
3. The speed limit valve of claim 2, wherein the transition portion (118) is any one of a trapezoidal configuration, a circular arc configuration, or a ramp-type configuration.
4. The speed limit valve according to claim 1, wherein the speed limit valve body (100) comprises a speed limit valve body (107), a speed limit elastic member (108) and an adjusting rod (109);
the first cavity (102) is formed in the speed-limiting valve body (107), the speed-limiting valve body oil passing hole (114) is formed in the side wall of the speed-limiting valve body (107), and the speed-limiting valve core oil passing hole (113) is formed in the side wall of the third cavity (105);
one end of the adjusting rod (109) is arranged on the valve core (103) of the speed-limiting valve, the other end of the adjusting rod extends to extend out of the second cavity (104) along the axial direction of the valve body (107) of the speed-limiting valve to form a fixing part, and the fixing part is connected with a load;
the speed-limiting elastic piece (108) is sleeved on the part of the adjusting rod (109) extending out of the second cavity (104), and the load can compress the speed-limiting elastic piece (108).
5. The speed limit valve according to claim 4, characterized in that the throttle valve spool (101) includes a sliding portion (110) and a stopper portion (111) connected to the sliding portion (110), and the stopper portion (111) protrudes from the sliding portion (110) in a radial direction of the second chamber (104);
the limiting part (111) and the sliding part (110) are sleeved on the adjusting rod (109) and can slide along the adjusting rod (109).
6. The speed limiting valve according to claim 5, characterized by further comprising a throttling elastic member (112), wherein the throttling elastic member (112) is sleeved on the sliding part (110);
the limiting part (111) can move from the third cavity (105) to the fourth cavity (106) under the action of the throttling elastic piece (112).
7. The speed limiting valve according to claim 4, characterized in that the bottom wall of the valve core (103) of the speed limiting valve is provided with an adjusting hole (119);
the adjusting hole (119) is communicated with the first cavity (102) and the second cavity (104), so that the hydraulic oil in the first cavity (102) sequentially passes through the adjusting hole (119), the valve core oil passing hole (113) of the speed-limiting valve and the valve body oil passing hole (114) of the speed-limiting valve to flow out.
8. The speed limiting valve according to claim 4, characterized by further comprising a snap spring (115), wherein the snap spring (115) is arranged between the speed limiting valve spool (103) and the speed limiting valve body (107) and is used for fixing the speed limiting valve spool (103) on the speed limiting valve body (107).
9. The speed limiting valve of claim 1 wherein the side wall of the fourth chamber (106) is provided with an orifice (116).
10. The speed limit valve according to claim 4, characterized in that a threaded portion (117) is provided on an outer side wall of the speed limit valve body (107), and the threaded portion (117) is used for connecting the speed limit valve body (100) to a workpiece.
CN202010585179.7A 2020-06-23 2020-06-23 Speed limiting valve Pending CN111692154A (en)

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Application Number Priority Date Filing Date Title
CN202010585179.7A CN111692154A (en) 2020-06-23 2020-06-23 Speed limiting valve

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Application Number Priority Date Filing Date Title
CN202010585179.7A CN111692154A (en) 2020-06-23 2020-06-23 Speed limiting valve

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CN111692154A true CN111692154A (en) 2020-09-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112797208A (en) * 2021-01-05 2021-05-14 绍兴泰格机电技术有限公司 Novel speed limiting valve

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676547A1 (en) * 1994-04-08 1995-10-11 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Flow control device for a high pressure hydraulic system and a valve for a load-lowering brake
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CN208749704U (en) * 2018-07-31 2019-04-16 贵阳玛莱特液压电磁科技有限公司 A kind of speed governing valve
CN109630490A (en) * 2018-12-07 2019-04-16 中国航空工业集团公司金城南京机电液压工程研究中心 A kind of Hydraulic Adjustable Speed valve
CN110219848A (en) * 2019-07-27 2019-09-10 蚌埠液力机械有限公司 Integrated form variable control valve

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* Cited by examiner, † Cited by third party
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EP0676547A1 (en) * 1994-04-08 1995-10-11 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Flow control device for a high pressure hydraulic system and a valve for a load-lowering brake
CN203130646U (en) * 2013-03-06 2013-08-14 绍兴泰格机电技术有限公司 Forklift speed limiting valve
CN203335508U (en) * 2013-06-21 2013-12-11 合肥力威汽车油泵有限公司 Hydraulic oil return speed control valve
CN106678107A (en) * 2017-01-19 2017-05-17 宁波江北宇洲液压设备厂 Speed limiting valve special for forklift truck
CN208749704U (en) * 2018-07-31 2019-04-16 贵阳玛莱特液压电磁科技有限公司 A kind of speed governing valve
CN109630490A (en) * 2018-12-07 2019-04-16 中国航空工业集团公司金城南京机电液压工程研究中心 A kind of Hydraulic Adjustable Speed valve
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Publication number Priority date Publication date Assignee Title
CN112797208A (en) * 2021-01-05 2021-05-14 绍兴泰格机电技术有限公司 Novel speed limiting valve
CN112797208B (en) * 2021-01-05 2023-03-10 绍兴泰格机电技术有限公司 Speed limiting valve

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Application publication date: 20200922