CN215334681U - Overflow valve and hydraulic motor with same - Google Patents
Overflow valve and hydraulic motor with same Download PDFInfo
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- CN215334681U CN215334681U CN202120221446.2U CN202120221446U CN215334681U CN 215334681 U CN215334681 U CN 215334681U CN 202120221446 U CN202120221446 U CN 202120221446U CN 215334681 U CN215334681 U CN 215334681U
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Abstract
The utility model relates to the technical field of hydraulic control valves, in particular to an overflow valve and a hydraulic motor with the same. The utility model provides an overflow valve includes valve body, case and pressure regulating spring, is provided with the import and the export that supply the medium circulation on the valve body, and pressure regulating spring sets up the one end at the case to drive the case and seal the import, the case includes: the plugging part is arranged at one end of the valve core, which is far away from the pressure regulating spring, and a conical surface is formed on the peripheral surface of the plugging part and is suitable for abutting against the inlet to seal the inlet; and a shoulder arranged at a distance from the plugging part; wherein the taper of the conical surface is theta, and the value range of the theta is [59.5, 60.5 ]; and in the axial direction of the valve core, the shortest distance L exists between the blocking shoulder and the plugging part, and the value range of L is [1.3, 1.4] mm. Fluid simulation experiments show that the resultant force value of the hydrodynamic force and the jet flow force of the valve core structure in the numerical range is small, the obstruction to the opening and closing of the valve core is small, and the valve core can be opened and closed more quickly.
Description
Technical Field
The utility model relates to the technical field of hydraulic control valves, in particular to an overflow valve and a hydraulic motor with the same.
Background
When power equipment such as an excavator and the like is started and braked, the load of a walking mechanism can be increased instantaneously, so that the internal impact of the walking mechanism is large, related parts are seriously abraded when impacted, and the service life of the parts is shortened.
In order to reduce the negative effect of the transient increase of the load, which causes a large hydraulic shock, a buffer relief valve is usually installed at a proper position of the hydraulic system, such as an end cover of the hydraulic motor. When the buffer overflow valve is adopted, the rear end of the valve core is provided with a return spring, and the return spring enables the valve core to be abutted against the oil inlet so as to seal the oil port. When the load is increased, the high-pressure liquid impacts the front end of the valve core of the overflow valve, the valve core retreats, the oil discharging port is opened, and pressure relief is achieved, so that the problem of hydraulic impact is solved.
However, when the high-pressure liquid acts on the front end of the valve core, the valve core is not only subjected to the pressure of the high-pressure liquid and the supporting force of the return spring, but also subjected to the impact force of the liquid because the high-pressure liquid flows, the liquid impact force is not well controlled, the valve core is easily stressed unevenly, the overflow pressure difference is large, the opening and closing time of the overflow valve is long, the starting and braking performances of the walking and the rotation of the engineering machinery excavator are seriously affected, and the phenomena of the rotation of the excavator or the 'slippage' of the walking, the 'insufficient starting force' and the like can occur.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the defect that the operation performance of power equipment is affected due to the long opening and closing time of an overflow valve in the prior art, so that the overflow valve and the hydraulic motor with the same are provided.
In order to solve the above problems, the present invention provides an overflow valve, including a valve body, a valve core and a pressure regulating spring, wherein the valve body is provided with an inlet and an outlet for medium to flow through, the pressure regulating spring is arranged at one end of the valve core to drive the valve core to close the inlet, and the valve core includes: the plugging part is arranged at one end of the valve core, which is far away from the pressure regulating spring, and a conical surface is formed on the peripheral surface of the plugging part and is suitable for abutting against the inlet to seal the inlet;
and a shoulder arranged at a distance from the blocking part; wherein the taper of the conical surface is theta, and the value range of the theta is [59.5, 60.5 ]; and in the axial direction of the valve core, the shortest distance L exists between the blocking shoulder and the plugging part, and the value range of L is [1.3, 1.4] mm.
Optionally, θ is 60 °, and L is 1.3 mm.
Optionally, the valve body is of a cylindrical structure with openings at two ends, and an annular stop block is arranged at the inner circumferential surface of the middle of the valve body;
a sliding cavity is formed in the middle of the annular stop block, and a sliding rod matched with the sliding cavity is formed on the valve core;
and the overflow cavity and the spring cavity are respectively arranged at two ends of the sliding cavity, the blocking part and the blocking shoulder are accommodated in the overflow cavity, and the pressure regulating spring is accommodated in the spring cavity.
Optionally, the opening of the valve body close to the overflow chamber is configured as the inlet, and the outlet is formed on the chamber peripheral wall of the overflow chamber;
wherein the peripheral surface part of the retaining shoulder blocks the outlet.
Optionally, the device further comprises a first valve seat which is of a cylindrical structure with two open ends and is detachably arranged on the inlet;
wherein a maximum diametrical dimension at a radial cross-section of the spool is no greater than a diametrical dimension of the inlet.
Optionally, one end of the first valve seat is formed with a flange embedded in the inlet, and the tapered surface is adapted to abut against an outer edge of the flange.
Optionally, the valve further comprises a second valve seat disposed at an end opening of the valve body, the second valve seat comprising:
the body is detachably arranged on the valve body, and an adjusting cavity is arranged in the body;
the first spring seat is slidably arranged in the adjusting cavity, and one end of the first spring seat is suitable for supporting the pressure adjusting spring;
the pressure regulating part is movably arranged on the body, and one end, deviating from the pressure regulating spring, of the first spring seat is abutted to the pressure regulating part.
Optionally, a throttling opening is formed in the axial direction of the valve core, the throttling opening is communicated with the spring cavity, a buffering piston is arranged on the outer peripheral wall of the spring cavity in a sliding mode, and a buffering opening is formed in the spring cavity.
The present invention also provides a hydraulic motor, comprising: a substrate; and the overflow valve is arranged on the base body, an inlet of the overflow valve is communicated with an oil inlet cavity of the hydraulic motor, and an outlet of the overflow valve is communicated with an oil outlet cavity of the hydraulic motor.
Optionally, at least two overflow valves are arranged on the oil inlet cavity and the oil outlet cavity, a buffer cavity is further arranged on the base body, the buffer cavity is respectively communicated with the oil inlet cavity and the oil outlet cavity, and outlets of the two overflow valves are communicated with the buffer cavity.
The technical scheme of the utility model has the following advantages:
1. the overflow valve comprises a valve body, a valve core and a pressure regulating spring, wherein an inlet and an outlet for medium circulation are arranged on the valve body, the pressure regulating spring is arranged at one end of the valve core to drive the valve core to seal the inlet, and the valve core comprises: the plugging part is arranged at one end of the valve core, which is far away from the pressure regulating spring, and a conical surface is formed on the peripheral surface of the plugging part and is suitable for abutting against the inlet to seal the inlet; and a shoulder arranged at a distance from the plugging part; wherein the taper of the conical surface is theta, and the value range of the theta is [59.5, 60.5 ]; and in the axial direction of the valve core, the shortest distance L exists between the blocking shoulder and the plugging part, and the value range of L is [1.3, 1.4] mm.
As explained in the background section of the utility model, those skilled in the art will find that the force applied to the valve core includes the pressure of the medium fluid on the valve core and the jet force in the forward direction, and the pressure of the pressure regulating spring on the valve core and the hydrodynamic force in the reverse direction. On the basis of obtaining the force distribution situation, in order to ensure the quick opening and closing of the valve core, the jet force is required to compensate the hydraulic force generated when the valve core works, and on the basis, the inventor improves the structural size of the valve core, specifically, the taper of the conical surface is theta, and the numeric area of the theta is [59.5, 60.5 ]; in addition, in the axial direction of the valve core, the shortest distance L exists between the blocking shoulder and the blocking part, the value range of L is [1.3, 1.4] mm, and in the range, the resultant force value of the hydraulic force and the jet flow force is found to be small through a fluid simulation experiment, the obstruction to the opening and closing of the valve core is small, and the valve core can be opened and closed more quickly.
2. According to the overflow valve, the angle theta is 60 degrees, the angle L is 1.3mm, and through a data curve chart of a simulation experiment, the resultant force value of hydraulic force and jet flow force is minimum and the obstruction to the opening and closing of the valve core is minimum.
3. In the overflow valve, the opening of the valve body close to the overflow cavity is constructed as an inlet, and the outlet is formed on the peripheral wall of the cavity of the overflow cavity; wherein the peripheral surface part of the blocking shoulder blocks the outlet. When the valve core plugs the inlet, the blocking shoulder can correspondingly plug the outlet so as to ensure that hydraulic equipment can prevent the leakage problem of the overflow valve under the normal pressure work.
4. The overflow valve also comprises a first valve seat which is of a cylindrical structure with openings at two ends and is detachably arranged on the inlet; the maximum diameter size of the radial section of the valve core is not larger than the diameter size of the inlet, the size relation can ensure that the valve core can be directly placed into the valve body from the inlet when the valve core is installed, and then the first valve seat is installed, so that the valve core is fixed, and the valve core is conveniently installed and maintained and replaced in the later period.
5. According to the overflow valve, the throttle orifice is axially arranged on the valve core, the throttle orifice is communicated with the spring cavity, the buffer piston is slidably arranged on the outer peripheral wall of the spring cavity, the buffer orifice is arranged on the spring cavity, and when the oil pressure of the oil inlet rises and does not reach the trigger pressure for opening the valve core of the overflow valve, high-pressure oil flows through the throttle orifice and acts on the buffer piston through the buffer orifice to push the buffer piston to move so as to release the pressure.
6. At least two overflow valves in the hydraulic motor are arranged on the oil inlet cavity and the oil outlet cavity, the base body is also provided with a buffer cavity, the buffer cavity is respectively communicated with the oil inlet cavity and the oil outlet cavity, and outlets of the two overflow valves are communicated on the buffer cavity. In the hydraulic motor, generally the working state that can switch between the oil inlet chamber and the oil outlet chamber according to using between the two, in order to guarantee when the oil inlet chamber with go out changeable between the oil outlet chamber, realize the uninstallation to pressure in the oil pocket, so all set up the overflow valve on oil inlet chamber and oil outlet chamber respectively, and make the export of two overflow valves all connect on the cushion chamber to reduce the complexity of the inside oil circuit of hydraulic motor, guarantee the compactness of its structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a sectional view of a relief valve in embodiment 1 provided by the present invention;
FIG. 2 is a cross-sectional view of a valve cartridge in embodiment 1 of the present invention;
fig. 3 is a partially enlarged view of a relief valve in embodiment 1 of the present invention;
fig. 4 is a sectional view of a hydraulic motor in embodiment 2 provided by the present invention;
FIG. 5 shows a schematic diagram of a fluid simulation experiment structure of the relief valve of the present invention;
FIG. 6 is a schematic diagram showing the relationship between the width of the shoulder and the resultant force of the relief valve according to the present invention;
fig. 7 is a schematic diagram showing the correspondence between the spool taper angle and the hydraulic force of the relief valve of the present invention.
Description of reference numerals:
1-a valve body; 11-an inlet; 12-an outlet; 13-an annular stop; 14-an overflow chamber; 15-a spring cavity; 151-buffer port;
2-a valve core; 21-a blocking part; 22-a shoulder; 23-a slide bar; 24-a choke; 211-a conical surface;
3-a pressure regulating spring;
4-a first valve seat; 41-a flange;
5-a second valve seat; 51-a body; 52-a regulating cavity; 53-a first spring seat; 54-a pressure regulating part;
6-a buffer piston;
7-a substrate; 71-an oil inlet cavity; 72-an oil outlet cavity; 73-a buffer chamber;
8-second spring seat.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., 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, but 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 invention. 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 invention, it should 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1 to fig. 3, the overflow valve provided for this embodiment includes a valve body 1, a valve core 2 and a pressure regulating spring 3, an inlet 11 and an outlet 12 for medium to flow through are provided on the valve body 1, the pressure regulating spring 3 is provided at one end of the valve core 2 to drive the valve core 2 to close the inlet 11, and the valve core 2 includes: the plugging part 21 is arranged at one end of the valve core 2 far away from the pressure regulating spring 3, a conical surface 211 is formed on the peripheral surface of the plugging part 21, and the conical surface 211 is suitable for abutting against the inlet 11 to seal the inlet 11; and a shoulder 22 spaced from the blocking portion 21; wherein, the taper of the conical surface 211 is theta, and the value range of theta is [59.5, 60.5 ]; and in the axial direction of the valve core 2, a shortest distance L exists between the retaining shoulder 22 and the plugging part 21, and the value range of L is [1.3, 1.4] mm.
The relief valve in this embodiment is used as a relief valve of a hydraulic motor for controlling the turning and traveling of the excavator, and the medium flowing inside the relief valve is hydraulic oil. As a modification, the relief valve in this embodiment may also be used in power equipment in common engineering machinery, such as a transmission, an oil cylinder, and the like. As a modification, the medium flowing through the relief valve in the present embodiment may also be gas or solid particles of small particle size or the like.
The inlet 11 in this embodiment is responsible for communicating the oil inlet end of the device to be depressurized to reduce the oil pressure at the oil inlet end. It should be further noted that, in the valve body 1 of the present embodiment, a related chamber (to be specifically described later) is provided, the valve core performs a piston-like motion in the chamber to realize opening and closing of the inlet 11, and when the inlet 11 is opened, high-pressure oil flows in through the inlet 11 and flows out of the outlet 12 to realize a pressure relief function.
Further, the pressure regulating spring 3 in this embodiment is a common compression spring, as a common implementation manner, one end of the pressure regulating spring abuts against the valve body 1, and the other end abuts against the valve core 2, and the valve core 2 realizes the plugging of the inlet 11 by the sum of the elastic force of the spring and the hydraulic pressure in the spring cavity.
The overflow valve in this embodiment has the following effects: as explained in the background section, those skilled in the art find that the force applied to the valve core includes the pressure and the jet force of the medium fluid to the valve core in the forward direction, and the pressure and the hydrodynamic force of the pressure regulating spring to the valve core in the reverse direction, and the force relationship is as follows:
equation 1: fPress and press＝FBullet+FLiquid for treating urinary tract infection-FShooting device；
Equation 2:
equation 3:
equation 4:
equation 5: d1 > D2;
d1: the diameter of the radial section of the pressure surface of the valve core plugging part; d2: the diameter of the spool rod;
wherein the overflow valve is opened by the difference of two side areas of the valve core when the pressure P isInlet pressureWhen the set value of the overflow pressure is reached, FPress and pressThe valve core is pushed to open by the spring force, and the system is protected. Equation 1 is the process of balancing the forces experienced during the opening of the valve element.
On the basis of obtaining the force distribution situation, in order to ensure the quick opening of the valve core, the jet force is required to compensate the hydraulic force generated when the valve core works, and on the basis, the inventor improves the structural size of the valve core, specifically, the taper of the conical surface is theta, and the numeric area of the theta is [59, 61 ]; in addition, in the axial direction of the valve core, the shortest distance L exists between the blocking shoulder and the blocking part, the value range of L is [1.3, 1.5] mm, and in the range, the resultant force value of the hydrodynamic force and the jet flow case is found to be small through a fluid simulation experiment, the obstruction to the opening and closing of the valve core is small, and the valve core can be ensured to be opened and closed more quickly.
The specific simulation result refers to fig. 5, where B in the lower part of fig. 5 represents the variation of the hydrodynamic force and C represents the variation of the jet fluid force, and the following can be obtained through the above:
optimizing parameters of the size L of the retaining shoulder:
in the following table: the total force borne by the valve core is as follows: fPressing 1F jet force and F hydrodynamic force; the static pressure means: fPressing 2And F bullet
| Shoulder L | Total force applied to the valve core | Static pressure | Combined force of liquid |
| 1.3 | 1996.86 | 1989.61 | 7.25 |
| 1.35 | 1973.95 | 1989.61 | -15.66 |
| 1.4 | 1935.74 | 1989.61 | -53.87 |
| 1.45 | 1863.73 | 1989.61 | -125.88 |
| 1.5 | 1816.57 | 1989.61 | -173.04 |
TABLE 1
The results can be obtained from table 1 and fig. 6, where the resultant force represents the resultant force of hydrodynamic force and jet force, and when the value θ is fixed (60 °), the pressure at the valve element shoulder decreases with the increase of L, and the resultant force of hydrodynamic force and jet flow received by the valve element gradually increases (where "+" is the valve element opening direction), so that when L is greater than or equal to 1.3mm and less than or equal to 1.4mm, the value of the resultant force is small, which is beneficial to the opening and closing of the valve element.
Optimization of parameters of a valve core taper angle alpha:
| valve core cone angle alpha | Total force applied to the valve core | Static pressure | Combined force of liquid |
| 59 | 1825.27 | 1989.61 | -164.34 |
| 59.5 | 1898.81 | 1989.61 | -90.80 |
| 60 | 1978.95 | 1989.61 | -10.66 |
| 60.5 | 2031.43 | 1989.61 | 41.82 |
| 61 | 2096.12 | 1989.61 | 106.51 |
TABLE 2
As can be seen from table 2 and fig. 7, the L value is fixed, the pressure at the valve element shoulder increases with the increase of θ, the resultant force of the hydrodynamic force and the jet flow received by the valve element gradually increases, ("+" is the opening direction of the valve element), and when θ is greater than or equal to 59.5 degrees and less than or equal to 60.5 degrees, the value of the resultant force is the smallest, which is beneficial to the opening and closing of the valve element.
On the basis of the above embodiment, as a further limitation, θ takes a value of 60 °, and L takes a value of 1.3 mm. Through the table of the simulation and the experimental test, the numerical value of the resultant force of the liquid is the minimum and the influence on the opening and closing of the valve core is the minimum in the value taking process.
In addition to the above embodiments, as a further limitation, as a specific implementation manner of this embodiment, as shown in fig. 1, the valve body 1 is a cylindrical structure with openings at both ends, an annular stopper 13 is disposed at an inner circumferential surface of the middle part, the annular stopper 13 is directly and integrally formed on the valve body 1, a sliding cavity is formed at a hollow part of the middle part, a sliding rod 23 matched with the sliding cavity is formed on the valve core 2, a clearance fit is adopted between the sliding rod 23 and the sliding cavity, and further, in order to ensure the sealing performance at the matched part of the sliding rod and the sliding cavity, in this embodiment, a plurality of sealing grooves are disposed on the outer circumferential surface of the sliding rod 23, and an O-shaped sealing member is embedded in the sealing grooves.
Further, in this embodiment, an overflow chamber 14 and a spring chamber 15 are respectively disposed at two ends of the sliding chamber, a blocking portion 21 and a blocking shoulder 22 are disposed in the overflow chamber 14, and a pressure regulating spring 3 is disposed in the spring chamber 15, so that when the oil pressure at the inlet 11 changes, the spool is pressed to retreat, a sliding rod 23 of the spool slides in the sliding chamber, and the pressure regulating spring 3 in the spring chamber is compressed, thereby opening the inlet 11, and further ensuring effective pressure relief.
On the basis of the above-described embodiment, as a further limitation, the opening of the valve body 1 near the overflow chamber 14 is configured as an inlet 11, and the outlet 12 is formed on the chamber peripheral wall of the overflow chamber 14; wherein the peripheral surface of the stop shoulder 22 partially blocks the outlet 12. When the valve core 2 blocks the inlet 11, the stop shoulder 22 also correspondingly blocks the outlet 12 to ensure that the hydraulic equipment can prevent the leakage problem of the overflow valve under the normal pressure working condition, when the oil pressure at the inlet 11 is increased, the valve core retreats, and the stop shoulder 22 can only block the part of the outlet 12, so that the outlet 12 is opened, and the normal overflow function is realized.
As a variant, the inlet 11 can also be formed on the chamber peripheral wall of the overflow chamber 14, which likewise performs the overflow function, and the position of the inlet 11 can be adapted to the connection arrangement with the device to be relieved.
On the basis of the above embodiment, as a further limitation, the valve further comprises a first valve seat 4 which is of a cylindrical structure with two open ends and is detachably arranged on the inlet 11; wherein, the maximum diameter size of the radial cross section department of case 2 is not more than the diameter size of import 11, and this kind of size relation can guarantee that the case when the installation, can directly place the case in the valve body from the import department, installs first disk seat again, realizes the fixed to the case, convenient installation and the later maintenance and the change to the case. Further, one end of the first valve seat 4 is formed with a flange 41, the flange 41 is embedded in the inlet 11, and the tapered surface 11 is adapted to abut against the outer edge of the flange 41. Furthermore, in order to ensure the sealing property of the connection between the first valve seat 4 and the oil port of an external device, an O-shaped sealing ring is further installed on the peripheral wall of the first valve seat.
On the basis of the above embodiment, as a further limitation, the valve further comprises a second valve seat 5 disposed at an opening at one end of the valve body 1, and the second valve seat 5 comprises: the body 51 is flange-shaped, and detachably arranged on the valve body 1, specifically, the body 51 is connected with a screw or pressed between interference fits, and an adjusting cavity 52 is arranged in the body 51 and communicated with the spring cavity. The pressure regulating device further comprises a first spring seat 53 which is slidably arranged in the regulating cavity 52, one end of the first spring seat is provided with a bulge, and the pressure regulating spring is sleeved in the bulge to ensure the stability of fixing. Still include pressure regulating part 54, the activity sets up on body 51, and the one end that first spring holder 53 deviates from pressure regulating spring 3 receives pressure regulating part 54 butt, and is concrete, and pressure regulating part 54 in this embodiment is common bolt, is provided with construction bolt's screw on body 51, and when the screwing on of bolt, the butt promotes first spring holder 53 towards the motion of spring intracavity in the one end of first spring holder 53, and its pressure regulating process is as follows:
the oil pressure of 11 departments of import comes, and the compression case retreats, connects the bolt through revolving this moment, adjusts the compression capacity of pressure regulating spring, drives valve element antedisplacement and shutoff import 11, through setting up the manometer on the second valve seat, observes whether the spring pressure that the case receives reaches the default, if, utilize the nut to lock the position of dead bolt can.
Further, a second spring seat 8 is detachably mounted at one end, far away from the blocking portion, of the valve core in the embodiment, so that the valve core 2 can be directly mounted from the inlet 11 conveniently, and the second spring seat 8 is mounted from an opening of the second valve seat. As a modification, the second spring seat 8 may also be directly integrated into the valve element 2 to simplify the assembly steps, and at this time, the size of the second spring seat 8 should be controlled to ensure the installation of the valve element.
In addition, as a further limitation, the axial direction of the valve core 2 is provided with a choke 24, the choke 24 is communicated with the spring cavity 15, the outer peripheral wall of the spring cavity 15 is provided with the buffer piston 6 in a sliding way, and the spring cavity 15 is provided with a buffer port 151. When the oil pressure of the inlet is increased and the triggering pressure for opening the valve core of the overflow valve is not reached, the high-pressure oil flows through the throttling port and acts on the buffer piston through the buffer port to push the buffer piston to move so as to release the pressure and realize the multi-stage regulation function of the pressure oil.
Example 2
As shown in fig. 4, the hydraulic motor provided for the present embodiment includes: the base body 7 is an end cover of the hydraulic motor in the embodiment, and the overflow valve A is arranged on the base body 7, an inlet 11 of the overflow valve A is communicated with an oil inlet cavity 71 of the hydraulic motor, and an outlet of the overflow valve A is communicated with an oil outlet cavity 72 of the hydraulic motor.
In the embodiment, two overflow valves are arranged on the oil inlet cavity 71 and the oil outlet cavity 72, the base body 7 is also provided with a buffer cavity 73, the buffer cavity 73 is respectively communicated with the oil inlet cavity 71 and the oil outlet cavity 72, and the outlets 12 of the two overflow valves are both communicated on the buffer cavity 73. In the hydraulic motor, generally the working state that can switch between the oil inlet chamber and the oil outlet chamber according to using between the two, in order to guarantee when the oil inlet chamber with go out changeable between the oil outlet chamber, realize the uninstallation to pressure in the oil pocket, so all set up the overflow valve on oil inlet chamber and oil outlet chamber respectively, and make the export of two overflow valves all connect on the cushion chamber to reduce the complexity of the inside oil circuit of hydraulic motor, guarantee the compactness of its structure.
Furthermore, in order to realize the installation of the relief valve a, an installation groove is processed on the base body 1, and in order to ensure the sealing performance of the relief valve installed on the base body 1, a sealing ring is continuously installed on the circumferential surface of the second valve seat.
Further, in order to ensure the normal movement of the buffer piston 6, a corresponding avoiding groove is processed in the mounting groove so as to ensure the movement stroke of the buffer piston and ensure effective pressure relief.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. The utility model provides an overflow valve, includes valve body (1), case (2) and pressure regulating spring (3), be provided with import (11) and export (12) that supply the medium circulation on valve body (1), pressure regulating spring (3) set up the one end of case (2), in order to drive case (2) seal import (11), its characterized in that, case (2) include:
the blocking part (21) is arranged at one end, far away from the pressure regulating spring (3), of the valve core (2), a conical surface (211) is formed on the peripheral surface of the blocking part (21), and the conical surface (211) is suitable for abutting against the inlet (11) to close the inlet (11);
and a shoulder (22) arranged at a distance from the blocking part (21);
wherein the content of the first and second substances,
the taper of the conical surface (211) is theta, and the value range of theta is [59.5, 60.5 ];
and in the axial direction of the valve core (2), a shortest distance L exists between the blocking shoulder (22) and the plugging part (21), and the value range of the L is [1.3, 1.4] mm.
2. The relief valve of claim 1, wherein θ takes a value of 60 °, and wherein L takes a value of 1.3 mm.
3. The overflow valve according to claim 1, characterized in that the valve body (1) is a cylindrical structure with two open ends, and an annular stop (13) is arranged on the inner circumferential surface of the valve body;
a sliding cavity is formed in the middle of the annular stop block (13), and a sliding rod (23) matched with the sliding cavity is formed on the valve core (2);
and an overflow cavity (14) and a spring cavity (15) which are respectively arranged at two ends of the sliding cavity, wherein the blocking part (21) and the blocking shoulder (22) are arranged in the overflow cavity (14), and the pressure regulating spring (3) is arranged in the spring cavity (15).
4. The overflow valve according to claim 3, characterized in that the opening of the valve body (1) close to the overflow chamber (14) is configured as the inlet (11), the outlet (12) being formed on the chamber peripheral wall of the overflow chamber (14);
wherein the peripheral surface of the retaining shoulder (22) partially blocks the outlet opening (12).
5. The overflow valve according to claim 1, further comprising a first valve seat (4) having a cylindrical structure with both ends open, which is detachably provided on the inlet (11);
wherein the maximum diameter dimension of the valve core (2) at the radial section is not larger than the diameter dimension of the inlet (11).
6. The excess flow valve according to claim 5, characterized in that one end of the first valve seat (4) is formed with a flange (41), the flange (41) being embedded in the inlet (11), the tapered surface (211) being adapted to abut against an outer edge of the flange (41).
7. Overflow valve according to anyone of claims 3-6, characterized in that it further comprises a second valve seat (5) arranged at an end opening of the valve body (1), the second valve seat (5) comprising:
the valve body (51) is detachably arranged on the valve body (1), and an adjusting cavity (52) is arranged in the valve body;
a first spring seat (53) slidably disposed in the adjustment chamber (52), one end adapted to support the pressure adjusting spring (3);
and the pressure regulating piece (54) is movably arranged on the body (51), and one end of the first spring seat (53) departing from the pressure regulating spring (3) is abutted by the pressure regulating piece (54).
8. The overflow valve according to claim 3 or 4, characterized in that a throttling opening (24) is arranged in the axial direction of the valve core (2), the throttling opening (24) is communicated with the spring cavity (15), a buffer piston (6) is arranged on the outer peripheral wall of the spring cavity (15) in a sliding manner, and a buffer opening (151) is arranged on the spring cavity (15).
9. A hydraulic motor, comprising:
a base body (7);
and an overflow valve as claimed in any one of claims 1 to 8 provided on the base body (7), an inlet (11) of the overflow valve communicating with an oil inlet chamber (71) of the hydraulic motor, and an outlet (12) communicating with an oil outlet chamber (72) of the hydraulic motor.
10. The hydraulic motor according to claim 9, wherein at least two relief valves are provided on the oil inlet chamber (71) and the oil outlet chamber (72), a cushion chamber (73) is further provided on the base body (7), the cushion chamber (73) communicates with the oil inlet chamber (71) and the oil outlet chamber (72), respectively, and outlets (12) of both relief valves communicate on the cushion chamber (73).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120221446.2U CN215334681U (en) | 2021-01-26 | 2021-01-26 | Overflow valve and hydraulic motor with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120221446.2U CN215334681U (en) | 2021-01-26 | 2021-01-26 | Overflow valve and hydraulic motor with same |
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| Publication Number | Publication Date |
|---|---|
| CN215334681U true CN215334681U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120221446.2U Active CN215334681U (en) | 2021-01-26 | 2021-01-26 | Overflow valve and hydraulic motor with same |
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| Country | Link |
|---|---|
| CN (1) | CN215334681U (en) |
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2021
- 2021-01-26 CN CN202120221446.2U patent/CN215334681U/en active Active
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