CN218670771U - Opening pressure adjustable check valve - Google Patents

Abstract

The utility model discloses a check valve with adjustable opening pressure, which comprises a valve body, a valve core, a spring seat and a locking spiral ring; the valve core is movably arranged in the valve body; one end of the spring is arranged in the valve core, and the other end of the spring is connected with one end of the spring seat; the other end of the spring seat is in threaded connection with the valve body, and the spring seat can axially move relative to the valve body through threads. This scheme is through changing into original steel wire retaining ring structure into can the rotatory spring holder of screw thread and locking double-screw bolt structure, spring easy dismounting from this, and spring force accessible screw thread removes the regulation, has improved the efficiency of check valve when using greatly.

Description

Opening pressure adjustable check valve

Technical Field

The utility model relates to a machine-building technical field, concretely relates to opening pressure adjustable check valve.

Background

In hydraulic transmission, a check valve is a widely used hydraulic component for controlling the flow direction of fluid, namely, forward opening and reverse stopping. When the valve is opened in the forward direction, the opening pressure can be different in different application occasions. The spring with different rigidity is usually installed according to the requirement, but because of the manufacturing error of the spring and the processing and assembling error of the matched parts, the springs in the same specification and batch have different opening pressures after being assembled, and for the occasion requiring the opening pressure to be more accurate, the testing and screening are needed to replace the spring, and because the steel wire ring for fixing the position of the spring is troublesome to disassemble and assemble, the efficiency is very low.

In addition, in order to improve the hydraulic transmission efficiency of various machines, the maximum use pressure of the hydraulic system is increased from the usual 320 bar to 420 bar and even higher. The existing tubular check valve has the advantages that the appearance is a hexagon, the wall thickness of the hexagonal opposite side and an inner pore channel is thinner, the highest service pressure is limited, the outer dimension can be increased if the wall thickness is increased, the weight is also increased, the cost is increased, and the operation efficiency is also influenced.

Therefore, how to optimize the structure of the one-way valve to improve the working efficiency of the one-way valve in use is a problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

The technical problem to the structure in current check valve leads to having inefficiency when using, the utility model aims to provide an opening pressure adjustable check valve, its easy dismounting, and the spring force is adjustable, has improved the efficiency of check valve when using greatly, has overcome the problem that prior art exists well.

In order to achieve the aim, the scheme provides a one-way valve with adjustable opening pressure, which comprises a valve body, a valve core, a spring seat and a locking spiral coil; the valve core is movably arranged in the valve body; one end of the spring is arranged in the valve core, and the other end of the spring is connected with one end of the spring seat; the other end of the spring seat is in threaded connection with the valve body, and the spring seat can axially move relative to the valve body through threads.

Furthermore, the inside axis of valve body is equipped with the first hydraulic fluid port of in-band screw thread, inlet port, guiding hole and second hydraulic fluid port and sets gradually.

Further, the length of the internal thread of the second oil port is greater than that of the internal thread of the first oil port.

Further, an inner groove is formed in the bottom of the second oil port, and the diameter of the inner groove is larger than the outer diameter of the internal thread of the second oil port.

Furthermore, the outer part of the valve body is a cylinder, and the outer part corresponding to the second oil port is an outer hexagon.

Further, the length of the outer hexagon is not more than one fifth of the total length of the valve body.

Further, a first outer chamfer is arranged on one side of the first oil port, and a second outer chamfer is arranged on one side of the second oil port; the diameters of the first outer chamfer and the second outer chamfer are the same as those of an externally matched pipe joint.

Furthermore, the valve core comprises an outer cone, a first outer circle, a second outer circle, a radial hole, a central hole and a spring hole; the first outer circle and the second outer circle are respectively arranged outside the outer cone; the radial hole, the central hole and the spring hole are sequentially arranged in the outer cone, and the centers of the radial hole, the central hole and the spring hole are on the same axis; one end of the outer cone is in contact with the oil inlet hole and the end face of the oil inlet hole to form hard seal.

Furthermore, the spring is arranged in the central hole of the valve core and is connected with one end of the spring seat; the outer ring of the spring seat is provided with threads and is matched and connected with the internal threads of the second oil port; the spring holder is internally provided with a first inner hexagonal hole, and the spring holder can axially move relative to the second oil port through the outer threads of the spring holder by matching the outer hexagonal wrench with the first inner hexagonal hole, so that the spring is compressed and released.

Furthermore, a positioning column is arranged outside one end, connected with the spring, of the spring seat to position the spring.

Furthermore, the outer ring of the tightening helicoidal ring is a thread and can be matched and connected with the external thread of the spring seat; tighten the inside hexagonal hole in second that is equipped with of helicoidal, through hexagonal hole cooperation in outer hexagonal spanner and the second, can make to tighten the helicoidal and cooperate with the spring holder to be connected, fix the spring holder.

Further, the size of the hexagonal opposite side of the second hexagon socket hole is larger than the size of the hexagonal tip of the first hexagon socket hole.

The opening pressure adjustable check valve that this scheme provided, it changes into spring holder and the locking double-screw bolt structure that can the screw thread be rotatory through with original steel wire retaining ring structure, and spring easy dismounting from this, spring force accessible screw thread remove the regulation, have improved the efficiency of check valve when using greatly.

In addition, the appearance of the hexagon of the one-way valve is changed into a cylinder, and the short hexagon capable of being operated by a wrench is only reserved at one end, so that the overall strength of the valve body is improved, the highest service pressure is improved, and the application range is enlarged.

Drawings

The invention is further described with reference to the following drawings and detailed description.

FIG. 1 is a schematic sectional view of the whole structure of the check valve with adjustable opening pressure;

FIG. 2 isbase:Sub>A view A-A of FIG. 1;

fig. 3 is a view B-B in fig. 2.

The following is a description of the components in the drawings:

100. the valve body 101, the first port 102, the second port 103, the oil inlet 104, the pilot hole 105, the inner groove 106, the outer hexagon 107, the first outer chamfer 108, the second outer chamfer 111, the first inner thread 112 and the second inner thread

200. Valve core 201, outer cone 202, first outer circle 203, second outer circle 204, radial hole 205, center hole 206, spring hole

300. The spring 400, the spring seat 401, the positioning column 402, the first hexagon socket 500, the locking coil 501 and the second hexagon socket.

Detailed Description

In order to make the technical means, creation characteristics, achievement purpose and efficacy of the utility model easy to understand and understand, the utility model is further explained by combining with the specific figure below.

To the structure in current check valve lead to having the technical problem of inefficiency when using, based on this technical problem, the utility model provides an opening pressure adjustable check valve, it changes into spring holder and the locking double-screw bolt structure that can the screw thread be rotatory through with original steel wire retaining ring structure, and spring easy dismounting from this, spring force accessible screw thread remove the regulation, have improved the efficiency of check valve when using greatly.

The check valve with adjustable opening pressure provided by the scheme is shown in fig. 1 and comprises a valve body 100, a valve core 200, a spring 300, a spring seat 400 and a locking spiral coil 500.

The valve body 100 is provided with a first port 101 with an internal threaded connector, a second port 102, an oil inlet hole 103 and a pilot hole 105 along a central axis.

The first port 101 and the second port 102 are disposed at both sides of the valve body 100, and the first port 101, the oil inlet hole 103, the pilot hole 104, and the second port 102 are sequentially disposed.

The length of the first internal thread 111 of the first oil port 101 is T1, which can ensure the length matched with an external pipe joint, the length of the second internal thread 112 of the second oil port 102 reserved for the external pipe joint is also T1, the total depth of the second internal thread is T1, the axial size of the mounting spring seat 400 and the locking coil 500 is removed, the axial adjustment stroke reserved for the spring seat 400 is removed, the distance size of the rest end face is T2, wherein T2 must be greater than or equal to T1, so that the contact interference between the end face of the external pipe joint and the end face of the locking coil 500 when the spring seat 400 and the locking coil 500 are at the outermost side is avoided.

An inner groove 105 is formed at the bottom of the second oil port 102, and the diameter of the inner groove 105 is larger than the outer diameter of the second internal thread 112, so that a part matched with the second internal thread 112 can move freely within the whole length range of the second internal thread 112.

The exterior of the valve body 100 is mostly cylindrical, and the exterior of the second oil port 102 corresponds to an exterior hexagon 106, see fig. 3. A first outer chamfer 107 is provided at one side of the first port 101 and a second outer chamfer 108 is provided at one side of the second port 102.

The appearance of the valve body hexagon body is changed into a cylinder, and the short hexagon body capable of being operated by a wrench is reserved at one end, so that the cylinder is greatly thickened after being matched with the wall thickness of an internal pore channel, the overall strength of the valve body is improved, and the highest service pressure is further improved.

It should be noted that if the width dimension of the opposite sides of the external hexagon 106 is S3, which is used for fixing the valve with a wrench of a corresponding size when the valve is installed and connected with an external pipe joint, in order to ensure sufficient strength of the valve body 100, the length L2 of the external hexagon 106 is not more than one fifth of the total length L1 of the valve body 100.

The first external chamfer 107 and the second external chamfer 108 have the same diameter and size as those of the external matching pipe joint, and have the functions of reducing the weight of the whole valve and avoiding damaging the flatness of the end face to cause poor sealing with the pipe joint.

The valve core 200 is installed in a guide hole of the valve body and is composed of an outer cone 201, a first outer circle 202, a second outer circle 203, a radial hole 204, a central hole 205 and a spring hole 206.

The radial hole 204, the center hole 205 and the spring hole 206 are sequentially disposed inside the outer cone 201, and the first outer circle 202 and the second outer circle 203 are respectively disposed outside the outer cone 201.

One end of the outer cone 201 is in contact connection with the oil inlet hole 103 and the end face thereof to form a hard seal, so that the check valve can be closed without leakage.

The specific structure and operation of the valve cartridge 200 are well known to those skilled in the art and will not be described herein.

The spring 300 is mounted within the central bore 205 of the spool and is in mating engagement with one end of the spring seat 400.

The spring seat 400 is installed inside the spring hole 206, and a positioning column 401 is arranged outside one end of the spring seat where the spring 300 is installed, and is used for positioning the spring 300 and limiting the spring 300.

The outer ring of the spring seat 400 is provided with a screw thread, which is engaged with the internal screw thread of the second oil port 102 to be screw-coupled and is axially movable with respect to the second oil port 102.

The spring seat 400 is provided with a first internal hexagonal hole 402 extending therethrough, the first internal hexagonal hole 402 being used for fluid passage and also being used in cooperation with an external hexagonal wrench having the same size as the first internal hexagonal hole 402, the external hexagonal wrench extending from the second oil port 102 through a second internal hexagonal hole 501 having a size larger than that of the external hexagonal wrench to reach the first internal hexagonal hole 402, so that the spring seat 400 can be moved axially relative to the second oil port 102 by the screw thread thereon to adjust the compression amount of the spring 300, and thus the compression force of the spring 300.

The outer ring of the locking coil 500 is a thread, and the inside of the locking coil is a second hexagon socket 501. Similarly, the second socket 501 is used for fluid passage, and is also used for an external hexagonal wrench having the same size as the second socket 510, which is inserted from the second port 102 to be engaged with the second socket 501, thereby allowing the locking coil 500 to axially move with respect to the spring seat 400.

When tight helicoil 500 and spring holder 400 axial contactless, spring holder 400 can axial displacement adjust spring 300 decrement, adjusts the back that finishes through outer hexagonal operation spanner and the cooperation of the interior hexagonal socket 501 of second that contracts in the helicoil 500, rotatory ring 500 that contracts makes it closely laminate with spring holder 400, then spring holder 400 can not carry out axial displacement again to guarantee that spring 300 decrement is unchangeable.

It should be noted that, referring to fig. 2, if the hexagonal-side dimension of the first hexagon socket 402 of the spring seat 400 is S1 and the hexagonal-tip dimension thereof is e1, and the hexagonal dimension of the second hexagon socket 501 of the locking coil 500 is S2, the dimension S2 must be larger than e1 in order to ensure that a wrench operating the spring seat 400 can pass through the second hexagon socket 501 of the compression coil 500.

In conclusion, the check valve with adjustable opening pressure can be used as a common check valve, an oil supplementing valve and a low-pressure regulating valve when being applied; the working process of the scheme in use is illustrated below; it should be noted that the following description is only a specific application example of the present solution and is not intended to limit the present solution.

1. As a common check valve:

normally, the spring seat 400 and the tightening coil 500 are adjusted to the right limit position by an external hexagonal operation wrench, at the moment, the compression amount of the spring 300 is minimum, the compression force of the spring 300 is also small, and the opening pressure of the one-way valve is minimum, so that the pressure loss of a pipeline is reduced. The first oil port 101 and the second oil port 102 are provided with pipe joints which are respectively connected with hydraulic pipelines at two ends.

When hydraulic oil flows in from the first oil port 101, hydraulic force of the hydraulic oil acts on the left end face of the valve element 200 with the same area as that of the oil inlet hole 103, the generated thrust overcomes corresponding opening pressure generated by compression force of the spring 300, the valve element 200 is jacked open, and is moved rightwards, and the hydraulic oil reaches the second oil port 102 through the oil inlet hole 103, an annular cavity between the guide hole 104 and the first outer circle 202, the radial hole 204, the center hole 205, the first inner hexagonal hole 402 and the second inner hexagonal hole 501. This is the forward opening function of the check valve.

When hydraulic oil flows in from the second oil port 102, the hydraulic oil reaches the guide hole 104 through the second hexagon socket 501 and the first hexagon socket 402, hydraulic force acts on the right end face of the valve element 200 communicated with the area of the guide hole 104, the outer cone 201 of the valve element 200 is pressed against the intersection angle between the oil inlet hole 103 and the right end face of the valve element, a hard sealing effect is achieved, and the hydraulic oil cannot flow into the first oil port 101. This is the reverse closing function of the check valve.

If the opening pressure needs to be further reduced to minimize the pressure loss of the check valve, the spring 300 can be removed, so that the check valve can be directly opened without overcoming the compression force of the spring 300 when being opened in the forward direction, but the whole check valve needs to be vertically installed, the first oil port 101 is arranged below, and the second oil port 102 is arranged above, so that the valve core 200 is lowered due to the self gravity, and the check valve is ensured to be in a closed state at ordinary times.

2. The oil replenishing valve is used as:

normally, the spring seat 400 and the locking coil 500 are adjusted to the right limit position by an external hexagonal operation wrench, the compression amount of the spring 300 is minimum, the compression force of the spring 300 is also small, the opening pressure of the check valve is minimum, and the valve core 200 is easy to open. The first oil port 101 is provided with a pipe joint to be connected with an oil tank, and the second oil port 102 is provided with a pipe joint to be connected with a hydraulic system.

When the hydraulic system works, the oil cylinder of the actuating mechanism is subjected to a load force, usually high pressure, the hydraulic force acts on the right end face of the valve core 200 communicated with the area of the guide hole, the outer cone 201 of the valve core 200 is pressed against the intersection angle of the oil inlet hole 103 and the right end face of the oil inlet hole to play a role of hard sealing, and the valve core 200 is in a closed state, which is the reverse closing function of the one-way valve.

When the oil cylinder is in certain mechanical actions, negative pressure can be generated in a hydraulic pipeline, bubbles can be generated when hydraulic oil in the pipeline is not filled enough, and when the next high-pressure action is performed, the bubbles are broken, so that cavitation erosion phenomenon can be generated on internal parts of a hydraulic system, and the surface is damaged. With the check valve, the second oil port 102 connected to the system is under negative pressure, the first oil port 101 connected to the oil tank is under positive pressure, the pressure difference between the two ends overcomes the spring force to open the valve core 200, and the hydraulic oil enters the system pipeline from the oil tank for oil supplement. This is the forward opening function of the check valve.

3. The low-pressure regulating valve is used as follows:

the pressure regulation of the hydraulic system usually adopts an overflow valve, but in some occasions, lower pressure is needed, and the lowest set pressure of the overflow valve is greater than the needed pressure and can be realized by a check valve.

The first port 101 is provided with a pipe joint for connecting a hydraulic system, and the second port 102 is provided with a pipe joint for connecting an oil tank.

The spring seat 400 and the locking coil 500 are firstly adjusted to the right limit position through an outer hexagonal operation wrench, the compression amount of the spring is minimum, the compression force of the spring is also small, and the opening pressure of the check valve is minimum. And then the spring seat is slowly adjusted inwards, a pressure gauge on one side of the system is observed until required pressure is adjusted, and then the locking spiral ring is screwed inwards to the attached spring seat and is screwed and locked.

The check valve with adjustable opening pressure, which is formed by the scheme, is changed into a spring seat and a locking stud structure which can rotate in a threaded manner by changing the existing steel wire check ring structure which is not easy to disassemble and assemble, the spring seat can move axially through threads, the opening pressure is adjusted by adjusting the compression force of the spring, the structure can ensure that the spring is convenient to disassemble and assemble, and the spring force is adjustable, so that the opening pressure can be accurately adjusted.

In addition, the appearance of the hexagon body is changed into a cylinder, the short hexagon body which can be operated by a wrench is reserved at one end, the integral strength of the valve body is improved, the highest service pressure is also improved, the highest service pressure is improved from 320 bar to 450 bar, and the application range is expanded.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (12)

1. A check valve with adjustable opening pressure is characterized by comprising a valve body, a valve core, a spring seat and a locking spiral ring; the valve core is movably arranged in the valve body; one end of the spring is arranged in the valve core, and the other end of the spring is connected with one end of the spring seat; the other end of the spring seat is in threaded connection with the valve body, and the spring seat can axially move relative to the valve body through threads.

2. The check valve with the adjustable opening pressure as claimed in claim 1, wherein a first oil port with internal threads, an oil inlet, a guide hole and a second oil port are formed in a central axis of the valve body and are sequentially arranged.

3. The check valve with adjustable opening pressure as claimed in claim 2, wherein the length of the internal thread of the second oil port is greater than that of the internal thread of the first oil port.

4. The check valve with adjustable opening pressure as claimed in claim 2, wherein the bottom of the second oil port is provided with an inner groove, and the diameter of the inner groove is larger than the external diameter of the internal thread of the second oil port.

5. The check valve with adjustable opening pressure as claimed in claim 1, wherein the valve body is externally provided with a cylinder, and the corresponding external part of the second oil port is externally provided with a hexagon.

6. An adjustable cracking pressure check valve as claimed in claim 5, wherein the length of the outer hexagon is no more than one fifth of the total length of the valve body.

7. The check valve with adjustable opening pressure as claimed in claim 2, wherein one side of the first oil port is provided with a first outer chamfer, and one side of the second oil port is provided with a second outer chamfer; the diameters of the first outer chamfer and the second outer chamfer are the same as those of an externally matched pipe joint.

8. The check valve with adjustable opening pressure as claimed in claim 1 or 2, wherein the valve core comprises an outer cone, a first outer circle, a second outer circle, a radial hole, a central hole and a spring hole; the first outer circle and the second outer circle are respectively arranged outside the outer cone; the radial hole, the central hole and the spring hole are sequentially arranged in the outer cone, and the centers of the radial hole, the central hole and the spring hole are on the same axis; one end of the outer cone is in contact with the oil inlet hole and the end face of the oil inlet hole to form hard seal.

9. The check valve of claim 8, wherein the spring is installed inside the central hole of the valve body and connected to one end of the spring seat; the outer ring of the spring seat is provided with threads and is matched and connected with the internal threads of the second oil port; the spring seat is internally provided with a first inner hexagonal hole, and the spring seat can axially move relative to the second oil port through external threads of the spring seat through the matching of an external hexagonal wrench and the first inner hexagonal hole so as to compress and release the spring.

10. The check valve with the adjustable opening pressure as claimed in claim 1, wherein a positioning column is disposed outside an end of the spring seat connected to the spring for positioning the spring.

11. The check valve with the adjustable opening pressure as claimed in claim 1, wherein the outer ring of the locking coil is threaded and can be connected with the external thread of the spring seat in a matching manner; hexagonal hole in the locking helicoidal is inside to be equipped with the second, and through outer hexagonal spanner and the cooperation of hexagonal hole in the second, can make locking helicoidal and spring holder cooperate and be connected, fix the spring holder.

12. The adjustable cracking pressure check valve of claim 11, wherein the second socket head has a hexagonal opposite side dimension greater than a hexagonal tip dimension of the first socket head.

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