CN209856131U - Direct-acting overflow valve - Google Patents
Direct-acting overflow valve Download PDFInfo
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- CN209856131U CN209856131U CN201920240180.9U CN201920240180U CN209856131U CN 209856131 U CN209856131 U CN 209856131U CN 201920240180 U CN201920240180 U CN 201920240180U CN 209856131 U CN209856131 U CN 209856131U
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Abstract
The utility model discloses a direct-acting overflow valve, which comprises a valve body provided with an inner cavity, wherein one end of the valve body is connected with a disc-shaped connecting part of an end cover, a valve core is movably arranged in the inner cavity, a spring adjusting component is arranged between the valve core and the end cover, and a liquid inlet and an overflow port are arranged on the valve body; one end of the valve core extends out of the valve body, the end part of the valve core extending out of the valve body is provided with a hydraulic control port, and the other end of the valve core is in clearance fit with the inner wall of the valve body at the overflow port. The spring adjusting assembly comprises a semi-closed spring sleeve, a spring and an adjusting screw, the inner wall of the spring sleeve is in clearance fit with the outer wall of the cylindrical mounting part of the end cover extending into the inner cavity, an annular boss is arranged at the opening end of the spring sleeve, and the spring is sleeved on the outer wall of the spring sleeve and clamped between the annular boss and the valve core; the adjusting screw penetrates out of the cylindrical mounting part and is abutted against the inner wall of the closed end of the spring sleeve. The utility model discloses a direct-acting overflow valve reliability is high, the precision is high, long service life just can be used to require among the higher hydraulic system.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic pressure control valve, especially, relate to a direct-acting overflow valve.
Background
The overflow valve is a hydraulic pressure control valve, and mainly plays the roles of constant pressure overflow, pressure stabilization, system unloading and safety protection in hydraulic equipment. In hydraulic equipment, the pressure of the system is limited mainly by liquid overflow so as to keep the pressure within a specified pressure, and thus, the overpressure protection of each element of the system is achieved. When the hydraulic pressure is smaller than the set pressure of the overflow valve spring, the valve core is pressed on an overflow port of the hydraulic oil by the spring, and when the hydraulic pressure exceeds the set pressure of the overflow valve spring, the liquid inlet is communicated with the overflow port to perform overflow pressure relief.
The direct-acting overflow valve is a common structure in the overflow valve. The Chinese patent specification CN106438549A published in 2/22/2017 discloses a direct-acting overflow valve, wherein pressure liquid is introduced into an inlet P of the direct-acting overflow valve, a part of liquid enters the bottom of a valve core through a gap between the valve core and a shell to generate acting force on the valve core, when the pressure is high enough, a spring is compressed, the inlet P is communicated with an overflow port T, and the liquid entering from the inlet P overflows through the overflow port T. Furthermore, the spring force of the spring can be adjusted by means of an adjusting screw.
Although the direct-acting overflow valve and other existing direct-acting overflow valves can achieve the purpose of overflow pressure stabilization, the direct-acting overflow valve still has the following disadvantages: 1) the spring is not protected, if the hydraulic pressure is too high or the pump starts to impact, the spring is compressed too much, the permanent deformation of the spring is accelerated after the spring is used for a long time, the service life of the spring is shortened, and the precision and the reliability of the overflow valve are further influenced; 2) when the hydraulic pressure is reduced and the valve core returns, the liquid between the bottom of the valve core and the shell has no extra discharge port and can be discharged only through the gap between the valve core and the shell, and the discharge is slow, so that the valve core is not closed timely or can not return well, and the sensitivity and the reliability of the overflow valve are influenced; 3) the adjusting screw has no protection and limiting functions, so that the phenomenon of manual misoperation or accidental loosening and displacement of the adjusting screw is easily caused, the set pressure of the spring is changed, and the performance of the overflow valve is influenced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies existing in the prior art, the utility model aims to solve the technical problem that a direct-acting overflow valve with long service life, high reliability and high precision is provided, and the direct-acting overflow valve can be used in a hydraulic system with higher requirements.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a direct-acting overflow valve comprises a valve body provided with an inner cavity, wherein one end of the valve body is provided with an end cover, a valve core is movably arranged in the inner cavity, a spring adjusting assembly is arranged between the valve core and the end cover, and the valve body is provided with a liquid inlet and an overflow port;
one end of the valve core extends out of the valve body, a hydraulic control port is arranged at the end part of the valve core extending out of the valve body, and the other end of the valve core is in clearance fit with the inner wall of the valve body at the overflow port;
the end cover comprises a disc-shaped connecting part and a cylindrical mounting part which are connected, the disc-shaped connecting part is connected with one end of the valve body, and the cylindrical mounting part extends into the inner cavity;
the spring adjusting assembly comprises a spring sleeve, a spring and an adjusting screw, one end of the spring sleeve is an open end, the other end of the spring sleeve is a closed end, the inner wall of the spring sleeve is in clearance fit with the outer wall of the cylindrical mounting part, the open end is provided with an annular boss, and the spring is sleeved on the outer wall of the spring sleeve and clamped between the annular boss and the valve core; the adjusting screw penetrates out of the cylindrical installation part and abuts against the inner wall of the closed end.
Preferably, a thrust sleeve for limiting movement of the valve spool is disposed within the valve body.
Preferably, the inner wall of the top of the valve body is provided with a positioning step, the peripheral wall of one end of the thrust sleeve is provided with a positioning boss, and the positioning boss is fixed between the bottom surface of the disc-shaped connecting part and the positioning step.
Preferably, the valve core is of an integrated structure and comprises an upper valve core, a connecting rod and a lower valve core which are sequentially connected;
the upper valve core is of a cylindrical structure with an open top, the outer wall of the upper valve core is in clearance fit with the inner wall of the valve body at the overflow port, and the spring is clamped between the annular boss and the inner wall of the bottom of the upper valve core;
the lower valve core is of a stepped cylindrical structure, a large-diameter cylindrical section of the lower valve core is connected with the connecting rod, the outer wall of the large-diameter cylindrical section is in clearance fit with the inner wall of the valve body, and the small-diameter cylindrical section of the lower valve core extends out of the valve body.
Preferably, the valve body is annularly provided with a plurality of liquid discharge holes, a liquid discharge channel is arranged in the connecting rod, and the liquid discharge channel is communicated with the liquid discharge holes;
the liquid drainage channel extends to the small-diameter cylindrical section of the lower valve core, a liquid inlet hole is formed in the small-diameter cylindrical section, and the liquid inlet hole is communicated with the inner cavity of the valve body and the liquid drainage channel.
Preferably, the inner wall of the valve body is provided with a conical sealing surface, and the bottom of the upper valve core is in sealing fit with the conical sealing surface.
Preferably, the end cover is of an integrated structure, a stepped through hole is formed in the center of the end cover, the stepped through hole comprises a first hole section and a second hole section which are sequentially connected from top to bottom, and the diameter of the first hole section is larger than that of the second hole section;
the inner walls of the first hole section and the second hole section are respectively provided with a first internal thread and a second internal thread, and the directions of the first internal thread and the second internal thread are opposite;
the rod part of the adjusting screw is in threaded connection with the second hole section, a set screw is in threaded connection with the first hole section, and the head of the set screw abuts against the head of the adjusting screw.
Preferably, the valve body comprises a cylindrical body, one end of the cylindrical body is provided with a flange, and the flange is connected with the disc-shaped connecting part through bolts.
Preferably, a sealing ring is arranged between the valve body and the end cover.
Preferably, a seal ring is disposed between the cylindrical mounting portion and the spring sleeve.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
in the direct-acting overflow valve of the utility model, one end of the valve core extends to be provided with the hydraulic control port, and the end cover cylindrical installation part extends into the inner cavity; the spring sleeve is sleeved on the outer wall of the cylindrical mounting part, an annular boss is arranged at the opening end of the spring sleeve, and the spring is sleeved on the outer wall of the spring sleeve and clamped between the annular boss and the valve core; the adjusting screw penetrates out of the cylindrical mounting part and is abutted against the inner wall of the closed end of the spring sleeve.
The spring sleeve plays a role in guiding the movement of the spring, so that the deformation phenomenon of the spring in the use process can be effectively avoided, the service life of the spring is prolonged, and the precision and the reliability of the overflow valve are ensured; meanwhile, the position of the spring sleeve is adjusted by utilizing the adjusting screw, so that the compression amount of the spring is adjusted, the elasticity of the spring is adjusted, the requirements of different hydraulic systems are met, the deformation of the spring used for a long time can be compensated, and the service life of the spring is prolonged.
To sum up, the utility model discloses a direct-acting overflow valve reliability is high, the precision is high, long service life just can be arranged in requiring higher hydraulic system.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of the valve cartridge of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 2;
in the figure: 1-valve body, 11-cylindrical body, 111-liquid discharge hole, 12-flange plate, 2-end cover, 21-disc connecting part, 22-cylindrical mounting part, 23-step through hole, 3-valve core, 31-upper valve core, 32-connecting rod, 321-liquid discharge channel, 33-lower valve core, 331-large diameter cylindrical section, 332-small diameter cylindrical section, 333-liquid inlet hole, 4-spring adjusting component, 41-spring sleeve, 411-annular boss, 42-spring, 43-adjusting screw, 5-thrust sleeve, 51-positioning boss, 6-set screw, P-liquid inlet, T-overflow port, X-hydraulic control port and 7-sealing ring.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the description of the present embodiment, it is to be understood that
The orientations and positional relationships described in the "upper", "lower", "top", "bottom", and the like are the orientations and positional relationships presented in the drawings, and are only for the convenience of simplifying the description, and should not be construed as limiting the present invention.
As shown in fig. 1 and fig. 2 together, the utility model discloses a direct-acting overflow valve, including the valve body 1 that is equipped with the inner chamber, valve body 1 includes cylindric body 11, and the upper end of cylindric body 11 is provided with ring flange 12, and bolted connection is passed through with the disk connecting portion 21 of end cover 2 (being equivalent to flange) to ring flange 12, and still is provided with sealing washer 7 between the ring flange 12 of valve body 1 and the disk connecting portion 21 of end cover 2, can prevent that liquid from leaking. A valve core 3 is movably arranged in the inner cavity of the valve body 1, a spring adjusting assembly 4 is arranged between the valve core 3 and the end cover 2, and a plurality of liquid inlets P and overflow ports T are annularly arranged on the periphery of the valve body 1 at equal intervals; the liquid inlet P is positioned below the overflow port T.
One end of the valve core 3 extends out of the valve body 1, the end part of the valve core 3 extending out of the valve body 1 is provided with a hydraulic control port X, and the other end of the valve core 3 is in clearance fit with the inner wall of the valve body 3 at the overflow port T. The cylindrical mounting part 22 of the end cap 2 extends into the inner cavity of the cylindrical body 11; wherein the end cap 2 is a unitary structure connected by a disc-shaped connecting portion 21 and a cylindrical mounting portion 22.
The spring adjusting assembly 4 comprises a spring sleeve 41, a spring 42 and an adjusting screw 43, wherein one end of the spring sleeve 41 is an open end, and the other end of the spring sleeve is a closed end; the inner wall of the spring sleeve 41 is in clearance fit with the outer wall of the cylindrical mounting portion 22, an annular boss 411 (edge) is arranged at the opening end of the spring sleeve 41, and the annular boss 411 is used for fixing one end of the spring 42 and is equivalent to an upper spring seat; the spring 42 is sleeved on the outer wall of the spring sleeve 41 and clamped between the end surface of the annular boss 411 and the valve core 3; the adjusting screw 43 passes through the cylindrical mounting portion 22 and abuts against the inner wall of the closed end of the spring sleeve 41, and another sealing ring 7 is arranged between the cylindrical mounting portion 22 and the spring sleeve 41, so that liquid can be prevented from entering the spring sleeve 41, and the adjusting screw 43 is prevented from being corroded.
The spring sleeve 41 plays a role in guiding the movement of the spring 42, so that the deformation phenomenon of the spring 42 in the use process can be effectively avoided, the service life of the spring 42 is prolonged, and the precision and the reliability of the overflow valve are ensured; meanwhile, the position of the spring sleeve 41 in the valve body 1 is adjusted by the adjusting screw 43, so that the compression amount of the spring 42 is adjusted, the elasticity of the spring 42 is adjusted, the requirements of different hydraulic systems are met, the deformation of the spring 42 used for a long time can be compensated, and the service life of the spring 42 is prolonged.
The hydraulic pressure among the hydraulic system passes through hydraulic control mouth X and transmits case 3, and when hydraulic pressure exceeded spring set pressure value, case 3 rose, and spring 42 is compressed under the direction of spring sleeve 41, and inlet P and overflow mouth T communicate, and liquid gets into the valve body 1 inner chamber from inlet P, then carries out the overflow release through overflow mouth T.
In the embodiment, in order to limit the lifting height of the valve core 3, the thrust sleeve 5 is additionally arranged in the valve body 1, and the thrust limiting effect is achieved on the valve core 3; when the pressure on the hydraulic control port X is too high, the lifting height of the valve core 3 can be limited on the premise of ensuring that the overflow port T is fully opened, the permanent deformation of the spring 42 caused by the excessive compression of the spring 42 is avoided, and the service life of the spring 42 is prolonged.
The thrust sleeve 5 is specifically mounted in the following manner: a positioning step is arranged on the inner wall of the top of the valve body 1, a positioning boss 51 is arranged on the outer peripheral wall of one end of the thrust sleeve 5, and when the end cover 2 is fastened, the positioning boss 51 is fixed between the bottom surface of the disc-shaped connecting part 21 of the end cover 2 and the positioning step; alternatively, the thrust sleeve 5 and the valve body 1 are directly welded.
As shown in fig. 3, in the present embodiment, the valve core 3 is an integrated structure, and includes an upper valve core 31, a connecting rod 32, and a lower valve core 33, which are connected in sequence; the upper valve core 31 is of a cylindrical structure with an open top, the outer wall of the upper valve core 31 is in clearance fit with the inner wall of the valve body 1 at the overflow port T, and the spring 42 is actually clamped between the end surface of the annular boss 411 and the inner wall of the bottom of the upper valve core 31; the inner wall of the valve body 1 below the overflow port T is provided with a conical sealing surface, and the bottom of the upper valve core 31 is in sealing fit with the conical sealing surface, so that positioning and hard sealing are realized. The upper valve element 31, which is of cylindrical construction, serves in the present embodiment not only to close/open the overflow T but also to act as a lower spring seat.
The lower valve core 33 is a stepped cylindrical structure, and the large-diameter cylindrical section 331 of the lower valve core 33 is connected with the connecting rod 32. And the outer wall of the large-diameter cylindrical section 331 is also in clearance fit with the inner wall of the valve body 1, the small-diameter cylindrical section 332 of the lower valve core 33 extends out of the bottom port of the valve body 1, and the small-diameter cylindrical section 332 is also in clearance fit with the inner wall of the bottom port of the valve body 1, so that liquid leakage is avoided. Wherein the clearance fit is also ensured with the inner wall of valve body 1 to the outer wall of major diameter cylinder section 331, can prevent that liquid from directly scurrying into the inner chamber of valve body 1 from valve body 1 bottom port when external pressure is too big, in short, major diameter cylinder section 331 makes liquid get into the inner chamber of valve body 1 from inlet P all the time, then carries out the overflow release through overflow mouth T.
When the valve core 3 is returned, in order to ensure that liquid or gas between the bottom of the valve core 3 and the valve body 1 is rapidly and smoothly discharged, the valve core 3 closes the overflow port T in time; in the embodiment, the structure of the direct-acting overflow valve is further improved, a plurality of liquid discharge holes 111 are annularly arranged at equal intervals on the periphery of the valve body 1 below the thrust sleeve 5, a liquid discharge channel 321 is arranged in the connecting rod 32, the upper end of the liquid discharge channel 321 is communicated with the inner cavity of the upper valve core 31, and the inner cavity of the upper valve core 31 is communicated with the liquid discharge holes 111; and the lower end of the liquid drainage channel 321 extends into the small-diameter cylindrical section 332 of the lower valve core 33, a liquid inlet hole 333 is formed in the small-diameter cylindrical section 332, and the liquid inlet hole 333 is communicated with the inner cavity of the valve body 1 and the liquid drainage channel 321. Thus, when the valve core 3 returns, liquid or air between the bottom of the large-diameter cylindrical section 331 in the valve core 3 and the valve body 1 is rapidly discharged through the liquid inlet hole 333, the liquid discharge channel 321 and the liquid discharge hole 111, so that the valve core 3 returns well and the overflow port T is closed in time, and the sensitivity and the reliability of the direct-acting overflow valve are ensured.
As shown in fig. 4, in order to prevent the adjusting screw 43 from being loosened and displaced by human error or accident, the set pressure of the spring 42 is changed, which affects the accuracy of the direct-acting overflow valve; in the embodiment, the structure of the direct-acting overflow valve is further improved, a stepped through hole 23 is formed in the center of the end cover 2, the stepped through hole 23 comprises a first hole section and a second hole section which are sequentially connected from top to bottom, and the diameter of the first hole section is larger than that of the second hole section; the inner walls of the first hole section and the second hole section are respectively provided with a first internal thread and a second internal thread, and the directions of the first internal thread and the second internal thread are opposite; adjusting screw 43's pole portion and second hole section threaded connection have add holding screw 6 (hexagon socket head cap holding screw, standard part) in the first hole section, and holding screw 6 supports with adjusting screw 43's head and leans on.
The screw thread turning directions of the set screw 6 and the adjusting screw 43 are opposite, the protection and the limitation of the adjusting screw 43 can be realized, the loosening displacement or the manual misoperation after the adjusting screw 43 is set is avoided, meanwhile, the screw thread turning directions are opposite, and the adjusting screw 43 can be prevented from being driven when the set screw 6 is screwed in, so that the stability and the reliability of the direct-acting overflow valve are improved.
To sum up, the direct-acting overflow valve of the utility model increases the protection of the spring 42, prolongs the service life of the spring 42 and ensures the precision and reliability of the direct-acting overflow valve; the liquid drainage channel 321 is added, so that the valve core 3 can be ensured to return well, the overflow port T is closed in time, and the sensitivity and the reliability of the direct-acting overflow valve are further ensured; meanwhile, the set screw 6 is added, so that the fluctuation of the set pressure of the spring can be effectively avoided, and the precision and the reliability of the direct-acting overflow valve are ensured again.
The utility model discloses a direct-acting overflow valve is a whole longe-lived, the reliability is high, the precision is high, the flexibility is good, the direct-acting overflow valve that the leakproofness is good, can be arranged in requiring higher hydraulic system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and it is not intended to limit the present invention to include any modifications made within the spirit and principles of the present invention and any improvements made to the same type of direct acting overflow valve.
Claims (10)
1. A direct-acting overflow valve comprises a valve body provided with an inner cavity, wherein one end of the valve body is provided with an end cover, a valve core is movably arranged in the inner cavity, a spring adjusting assembly is arranged between the valve core and the end cover, and the valve body is provided with a liquid inlet and an overflow port; it is characterized in that the preparation method is characterized in that,
one end of the valve core extends out of the valve body, a hydraulic control port is arranged at the end part of the valve core extending out of the valve body, and the other end of the valve core is in clearance fit with the inner wall of the valve body at the overflow port;
the end cover comprises a disc-shaped connecting part and a cylindrical mounting part which are connected, the disc-shaped connecting part is connected with one end of the valve body, and the cylindrical mounting part extends into the inner cavity;
the spring adjusting assembly comprises a spring sleeve, a spring and an adjusting screw; one end of the spring sleeve is an open end, the other end of the spring sleeve is a closed end, the inner wall of the spring sleeve is in clearance fit with the outer wall of the cylindrical installation part, the open end is provided with an annular boss, and the spring is sleeved on the outer wall of the spring sleeve and clamped between the annular boss and the valve core; the adjusting screw penetrates out of the cylindrical installation part and abuts against the inner wall of the closed end.
2. The direct relief valve according to claim 1, wherein a thrust sleeve is provided in the valve body for restricting movement of the valve spool.
3. The direct overflow valve of claim 2 wherein the valve body has a positioning step on the inner wall of the top portion thereof, and the thrust sleeve has a positioning boss on the outer peripheral wall of one end thereof, the positioning boss being fixed between the bottom surface of the disk-shaped connecting portion and the positioning step.
4. The direct-acting overflow valve of claim 1, wherein the valve core is of an integrated structure and comprises an upper valve core, a connecting rod and a lower valve core which are sequentially connected;
the upper valve core is of a cylindrical structure with an open top, the outer wall of the upper valve core is in clearance fit with the inner wall of the valve body at the overflow port, and the spring is clamped between the annular boss and the inner wall of the bottom of the upper valve core;
the lower valve core is of a stepped cylindrical structure, a large-diameter cylindrical section of the lower valve core is connected with the connecting rod, the outer wall of the large-diameter cylindrical section is in clearance fit with the inner wall of the valve body, and the small-diameter cylindrical section of the lower valve core extends out of the valve body.
5. The direct overflow valve of claim 4 wherein the valve body has a plurality of drain holes disposed therein, and wherein the connecting rod has a drain passage disposed therein, the drain passage communicating with the drain holes;
the liquid drainage channel extends to the small-diameter cylindrical section of the lower valve core, a liquid inlet hole is formed in the small-diameter cylindrical section, and the liquid inlet hole is communicated with the inner cavity of the valve body and the liquid drainage channel.
6. The direct overflow valve of claim 4 wherein the inner wall of the valve body defines a conical sealing surface and the bottom of the upper valve element sealingly engages the conical sealing surface.
7. The direct-acting overflow valve of claim 1, wherein the end cap is of an integral structure, a stepped through hole is formed in the center of the end cap, the stepped through hole comprises a first hole section and a second hole section which are sequentially connected from top to bottom, and the diameter of the first hole section is larger than that of the second hole section;
the inner walls of the first hole section and the second hole section are respectively provided with a first internal thread and a second internal thread, and the directions of the first internal thread and the second internal thread are opposite;
the rod part of the adjusting screw is in threaded connection with the second hole section, a set screw is in threaded connection with the first hole section, and the head of the set screw abuts against the head of the adjusting screw.
8. The direct overflow valve of claim 1 wherein the valve body comprises a cylindrical body having a flange disposed at one end thereof, the flange being bolted to the disk-like connection.
9. The direct relief valve according to claim 1, wherein a seal is disposed between the valve body and the end cap.
10. The direct overflow valve of claim 1 wherein a seal is disposed between the cylindrical mounting portion and the spring sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240180.9U CN209856131U (en) | 2019-02-26 | 2019-02-26 | Direct-acting overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240180.9U CN209856131U (en) | 2019-02-26 | 2019-02-26 | Direct-acting overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209856131U true CN209856131U (en) | 2019-12-27 |
Family
ID=68932234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920240180.9U Active CN209856131U (en) | 2019-02-26 | 2019-02-26 | Direct-acting overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209856131U (en) |
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2019
- 2019-02-26 CN CN201920240180.9U patent/CN209856131U/en active Active
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