CN222010634U - Pilot slide valve type pressure reducing valve - Google Patents

Abstract

The utility model relates to the technical field of pressure reducing valves, in particular to a pilot slide valve type pressure reducing valve, which comprises a guide sleeve and a valve sleeve, wherein a coil is sleeved outside the guide sleeve, a static iron core and an armature are arranged in the guide sleeve, and a push rod is arranged in the static iron core in a penetrating manner; the valve sleeve is internally provided with a main valve core, the surface of the valve sleeve is provided with a pilot port, an oil inlet and an oil outlet, the surfaces of the two ends of the main valve core are raised and are in sealing contact with the inner wall of the valve sleeve, the surface of the middle part of the main valve core is provided with a separation rib, the separation rib divides a gap between the main valve core and the valve sleeve into a first oil cavity communicated with the pilot port and a second oil cavity communicated with the oil inlet and the oil outlet, the inside of the main valve core is provided with a first runner, and the end part, close to the guide sleeve, of the main valve core is communicated with the first oil cavity by the first runner; the static iron core is provided with an auxiliary valve core, a second flow channel is arranged in the auxiliary valve core, and the second end of the push rod plugs the second flow channel after the coil is electrified; the valve sleeve being remote from the guide sleeve the end part is provided with a spring seat, a reset spring is arranged between the spring seat and the main valve core.

Description

Pilot slide valve type pressure reducing valve

Technical Field

The utility model relates to the technical field of pressure reducing valves, in particular to a pilot slide valve type pressure reducing valve.

Background

In hydraulic systems, pressure relief valves are often used to reduce the hydraulic branch pressure so that the branch pressure meets the load demand pressure and the outlet pressure automatically remains stable by means of the energy of the medium itself. When the common direct-acting pressure reducing valve in the prior art realizes the pressure reducing function, the electromagnet directly drives the valve core, on one hand, the valve core is driven to move by large electromagnetic force, so that the energy consumption of a power supply is large, the armature is generally designed to be large, and the whole volume of the pressure reducing valve is increased; on the other hand, the instant impact force generated by electrifying the electromagnet is larger, so that abnormal sound is easy to generate, and even the structure is damaged.

Disclosure of utility model

The utility model aims to provide a pilot slide valve type pressure reducing valve, optimize the structure of the existing pressure reducing valve, change the driving form of a valve core and solve the problems.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The pilot slide valve type pressure reducing valve comprises a guide sleeve and a valve sleeve which are connected with each other, a coil is sleeved outside the guide sleeve, a static iron core and an armature are arranged in the guide sleeve, a push rod is arranged in the static iron core in a penetrating mode, a first end of the push rod extends to the armature, the static iron core and the armature are mutually attracted after the coil is electrified, and the push rod is pushed to the valve sleeve by the armature; a main valve core capable of axially sliding is arranged in the valve sleeve, a pilot port, an oil inlet and an oil outlet are arranged on the surface of the valve sleeve, the surfaces of the two ends of the main valve core are raised and are in sealing contact with the inner wall of the valve sleeve, a separation rib is arranged on the surface of the middle part of the main valve core, the separation rib divides a gap between the main valve core and the valve sleeve into a first oil cavity communicated with the pilot port and a second oil cavity communicated with the oil inlet and the oil outlet, a first runner is arranged in the main valve core, and the first runner conducts the end part, close to the guide sleeve, of the main valve core with the first oil cavity; the static iron core is provided with an auxiliary valve core, a second flow passage is formed in the auxiliary valve core, the second flow passage is communicated with the first flow passage, the second end of the push rod is used for plugging the second flow passage after the coil is electrified, and the main valve core moves away from the auxiliary valve core under the action of oil pressure in the front guide port; the end of the valve sleeve, which is far away from the guide sleeve, is provided with a spring seat, a return spring is arranged between the spring seat and the main valve core, and the return spring applies an acting force to the main valve core, which moves towards the auxiliary valve core.

Optionally, the second end of the push rod is tapered, and a runner port of the second runner is provided with a tapered hole matched and sealed with the second end of the push rod.

Optionally, a damping screw is arranged in the first flow channel, and an overflow hole is arranged in the damping screw.

Optionally, a cavity for the main valve core to move is reserved between the second end of the main valve core and the spring seat, a third flow passage is arranged in the main valve core, and the third flow passage is used for communicating the cavity with the second oil cavity.

Optionally, the first end of the guide sleeve is provided with an internal thread, the first end of the valve sleeve is provided with an external thread matched with the internal thread, the static iron core is inserted into the first end of the valve sleeve, and a first sealing ring is arranged between the static iron core and the valve sleeve.

Optionally, a spring seat is installed at the second end of the valve sleeve and is axially limited by a retainer ring, and a second sealing ring is arranged between the spring seat and the valve sleeve.

Optionally, an end hole for installing the auxiliary valve core and a plurality of radial holes communicated with the end hole are formed in the static iron core, the radial holes extend to the surface of the static iron core, oil in the second runner is guided into the guide sleeve, one part of the surface of the static iron core is in interference fit with the inner wall of the guide sleeve, and an air vent groove is formed in the other part of the surface of the static iron core.

Optionally, a vent hole is formed in the armature, and the vent hole conducts two end faces and the side face of the armature.

Optionally, a filter screen is disposed on the valve sleeve and on the surface of the guide port.

Optionally, a nut is fitted on the second end of the guide sleeve, the nut securing the coil to the guide sleeve.

In summary, compared with the prior art, the pilot spool type pressure reducing valve forms a pilot oil cavity through the guide sleeve, the main valve core and the auxiliary valve core, and then an electromagnet is adopted to control the opening or closing of the pilot oil cavity, and when the pilot oil cavity is opened, the oil inlet and the oil outlet are unblocked; when the valve is closed, the oil pressure in the pilot oil cavity pushes the main valve core to slide in the valve sleeve, so that the function of controlling the pressure of the oil outlet is realized, the requirement on the electromagnet is reduced, and the valve is compact in integral structure and accurate in control.

Drawings

For a clearer description and understanding of the technical solutions of the embodiments of the present utility model, the following description will make a brief introduction to the drawings required for the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and the drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic diagram of a pilot spool type pressure reducing valve according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a pilot spool type pressure reducing valve according to a second embodiment of the present utility model;

fig. 3 is an enlarged view at a in fig. 2.

In the figure:

1. Guide sleeve;

2. a valve sleeve; 2a, a pilot port; 2b, an oil inlet; 2c, an oil outlet;

3. a coil;

4. A stationary core; 4a, end holes; 4b, radial holes; 4c, a ventilation groove;

5. An armature; 5a, vent holes;

6. a push rod;

7. A main spool; 7a, separating ribs; 7b, a first runner; 7c, a third runner;

8. A first oil chamber;

9. A second oil chamber;

10. A secondary valve core; 10a, a second flow passage; 10b, taper holes;

11. A spring seat;

12. A return spring;

13. Damping screw; 13a, overflow holes;

14. a first seal ring;

15. A retainer ring;

16. a second seal ring;

17. A filter screen;

18. And (5) a screw cap.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

Referring to fig. 1 to 3, the present preferred embodiment provides a pilot spool type pressure reducing valve, comprising a guide sleeve 1 and a valve sleeve 2 connected to each other, wherein:

The coil 3 is sleeved outside the guide sleeve 1, the static iron core 4 and the armature 5 are arranged in the guide sleeve 1, the push rod 6 is penetrated in the static iron core 4, the first end of the push rod 6 extends to the armature 5, the static iron core 4 and the armature 5 are mutually attracted after the coil 3 is electrified, and the push rod 6 is pushed to the valve sleeve 2 by the armature 5, so that the electromagnet drives the push rod 6 to act;

A main valve core 7 capable of axially sliding is arranged in the valve sleeve 2, a pilot port 2a, an oil inlet 2b and an oil outlet 2c are arranged on the surface of the valve sleeve 2, the surfaces of two ends of the main valve core 7 are raised and are in sealing contact with the inner wall of the valve sleeve 2, a separation rib 7a is arranged on the middle surface of the main valve core 7, the separation rib 7a divides a gap between the main valve core 7 and the valve sleeve 2 into a first oil cavity 8 communicated with the pilot port 2a and a second oil cavity 9 communicated with the oil inlet 2b and the oil outlet 2c, a first flow channel 7b is formed in the main valve core 7, and the end part, close to the guide sleeve 1, of the main valve core 7 is communicated with the first oil cavity 8 through the first flow channel 7 b;

The static iron core 4 is provided with an auxiliary valve core 10, a second flow passage 10a is formed in the auxiliary valve core 10, the second flow passage 10a is communicated with the first flow passage 7b, the second end of the push rod 6 plugs the second flow passage 10a after the coil 3 is electrified, the main valve core 7 moves away from the auxiliary valve core 10 under the action of oil pressure in the pilot port 2a, and the pilot oil drives the main valve core 7 to act, as shown in fig. 2 in detail;

The end of the valve sleeve 2 far away from the guide sleeve 1 is provided with a spring seat 11, a return spring 12 is arranged between the spring seat 11 and the main valve core 7, and the return spring 12 applies a force for moving the main valve core 7 towards the auxiliary valve core 10.

Therefore, the pilot spool type pressure reducing valve forms a pilot oil cavity through the guide sleeve 1, the main valve core 7 and the auxiliary valve core 10, and then an electromagnet is adopted to control the opening or closing of the pilot oil cavity, and when the pilot oil cavity is opened, the oil inlet 2b and the oil outlet 2c are unblocked; when the valve is closed, the oil pressure in the pilot oil cavity pushes the main valve core 7 to slide in the valve sleeve 2, so that the function of controlling the pressure of the oil outlet 2c is realized, the requirement on the electromagnet is reduced, the whole structure is compact, and the control is accurate.

As an alternative, the second end of the push rod 6 is provided with a taper hole 10b sealed by matching with the second end of the push rod 6, as shown in fig. 3, when the taper end of the push rod 6 contacts with the taper hole 10b of the auxiliary valve core 10, a closed cavity is formed between the first end of the main valve core 7 in the valve sleeve 2 and the first oil cavity 8, the pilot oil cannot be discharged, and the main valve core 7 is pushed to move.

As an alternative, a damping screw 13 is arranged in the first flow passage 7b, and an overflow hole 13a is arranged in the damping screw 13, wherein the overflow hole 13a is used for controlling the flow of the pilot oil liquid and preventing the pressure in the valve from being overloaded.

As an alternative, a cavity for the main valve core 7 to move is reserved between the second end of the main valve core 7 and the spring seat 11, a third flow passage 7c is formed in the main valve core 7, the third flow passage 7c conducts the cavity with the second oil cavity 9, pressure difference is avoided when the volume of the cavity is increased or decreased, the action of the main valve core 7 is influenced, and therefore the accuracy of the pilot spool type pressure reducing valve is improved.

As an alternative, the first end of the guide sleeve 1 is provided with an internal thread, the first end of the valve sleeve 2 is provided with an external thread matched with the internal thread, the static iron core 4 is inserted into the first end of the valve sleeve 2, and a first sealing ring 14 is arranged between the static iron core 4 and the valve sleeve 2, so that the tightness among the valve sleeve 2, the main valve core 7, the auxiliary valve core 10 and the static iron core 4 is ensured.

As an alternative, the spring seat 11 is installed at the second end of the valve sleeve 2 and is limited by the retainer ring 15 axially, and a second sealing ring 16 is arranged between the spring seat 11 and the valve sleeve 2, so that the spring seat 11 is reliably installed, and the tightness of the cavity is ensured.

As an alternative scheme, end hole 4a for installing auxiliary valve core 10 and a plurality of radial holes 4b communicated with end hole 4a are formed on static iron core 4, radial holes 4b extend to the surface of static iron core 4, oil in second flow channel 10a is guided into guide sleeve 1, part of the surface of static iron core 4 is in interference fit with the inner wall of guide sleeve 1, vent groove 4c is formed on the other part of the surface of static iron core 4, so when electromagnet is powered off, push rod 6 is not contacted with auxiliary valve core 10, second flow channel 10a is conducted with radial holes 4b, so that pilot oil is smoothly guided and discharged along radial holes 4b and vent groove 4c, pressure relief is realized (liquid return hole which is not shown is formed on guide sleeve 1), and main valve core 7 does not act at this time.

As an alternative, the inside of the armature 5 is provided with a vent hole 5a, and the vent hole 5a conducts the two end faces and the side faces of the armature 5, so that the armature 5 is free from pressure difference influence in the action process and is free from influence on the discharge of the pilot oil.

As an alternative, the surface of the valve sleeve 2, which is positioned on the pilot port 2a, is provided with a filter screen 17, so that the cleanliness of the pilot oil entering the pilot spool type pressure reducing valve is improved, and the service life of each part in the valve is ensured.

As an alternative, the second end of the guide sleeve 1 is provided with a screw cap 18, and the screw cap 18 fixes the coil 3 on the guide sleeve 1, so that the coil 3 and the guide sleeve 1 are reliably assembled.

It should be noted that, the above-mentioned alternative embodiments may be combined in any combination, and all the combined embodiments are within the scope of the present utility model.

The working principle of the pilot slide valve type pressure reducing valve is as follows:

When the coil 3 is electrified, the armature 5 pushes the push rod 6 to be attached to the static iron core 4 to form a closed cavity, after pilot oil enters from the pilot port 2a, the first flow channel 7b and the second flow channel 10a are filled and cannot flow out, and as the pilot oil is further led in, the oil pressure drives the main valve core 7 to move, so that the oil pressure of the oil outlet 2c is controlled;

When the coil 3 is powered off, the armature 5 is reset, the push rod 6 is not contacted with the auxiliary valve core 10, after the pilot oil enters from the pilot port 2a, the pilot oil flows out along the first flow passage 7b, the second flow passage 10a, the radial holes 4b, the ventilation grooves 4c and the like, the main valve core 7 is reset under the action of the reset spring 12, and the regulation and control effect on the oil pressure of the oil outlet 2c is not realized, as shown in fig. 1 in detail.

The above embodiments merely illustrate the basic principles and features of the present utility model, and the present utility model is not limited to the above embodiments, but can be variously changed and modified without departing from the spirit and scope of the present utility model, which is within the scope of the present utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A pilot slide valve type pressure reducing valve is characterized by comprising a guide sleeve (1) and a valve sleeve (2) which are connected with each other,

The guide sleeve (1) is sleeved with a coil (3), a static iron core (4) and an armature (5) are arranged in the guide sleeve (1), a push rod (6) is arranged in the static iron core (4) in a penetrating mode, a first end of the push rod (6) extends to the armature (5), the static iron core (4) and the armature (5) are attracted to each other after the coil (3) is electrified, the armature (5) pushes the push rod (6) to the valve sleeve (2),

A main valve core (7) capable of axially sliding is arranged in the valve sleeve (2), a pilot port (2 a), an oil inlet (2 b) and an oil outlet (2 c) are arranged on the surface of the valve sleeve (2), two end surfaces of the main valve core (7) are raised and are in sealing contact with the inner wall of the valve sleeve (2), a separation rib (7 a) is arranged on the middle surface of the main valve core (7), the separation rib (7 a) divides a gap between the main valve core (7) and the valve sleeve (2) into a first oil cavity (8) communicated with the pilot port (2 a) and a second oil cavity (9) communicated with the oil inlet (2 b) and the oil outlet (2 c), a first flow channel (7 b) is formed in the main valve core (7), the end part of the main valve core (7) close to the guide sleeve (1) is communicated with the first oil cavity (8),

The static iron core (4) is provided with a secondary valve core (10), a second flow passage (10 a) is arranged in the secondary valve core (10), the second flow passage (10 a) is communicated with the first flow passage (7 b), the second end of the push rod (6) is used for plugging the second flow passage (10 a) after the coil (3) is electrified, the primary valve core (7) moves away from the secondary valve core (10) under the action of oil pressure in the pilot port (2 a),

The end part of the valve sleeve (2) far away from the guide sleeve (1) is provided with a spring seat (11), a return spring (12) is arranged between the spring seat (11) and the main valve core (7), and the return spring (12) applies an acting force to the main valve core (7) moving towards the auxiliary valve core (10).

2. The pilot spool relief valve according to claim 1 wherein the second end of the pushrod (6) is provided with a taper, and the runner port of the second runner (10 a) is provided with a taper hole (10 b) sealed in cooperation with the second end of the pushrod (6).

3. The pilot spool relief valve according to claim 1, characterized in that a damping screw (13) is provided in the first flow passage (7 b), and that a spill orifice (13 a) is provided in the damping screw (13).

4. The pilot spool relief valve according to claim 1 wherein a cavity for the movement of the main spool (7) is left between the second end of the main spool (7) and the spring seat (11), a third flow passage (7 c) is provided in the main spool (7), and the third flow passage (7 c) communicates the cavity with the second oil chamber (9).

5. The pilot spool relief valve according to claim 1, characterized in that the first end of the guide sleeve (1) is provided with an internal thread, the first end of the valve sleeve (2) is provided with an external thread cooperating with the internal thread, the stationary core (4) is inserted into the first end of the valve sleeve (2), and a first sealing ring (14) is provided between the stationary core (4) and the valve sleeve (2).

6. The pilot spool relief valve according to claim 1 wherein the spring seat (11) is fitted into the second end of the valve housing (2) and is axially restrained by a retainer ring (15), a second sealing ring (16) being provided between the spring seat (11) and the valve housing (2).

7. The pilot spool type pressure reducing valve according to claim 1, wherein the static iron core (4) is provided with an end hole (4 a) for installing the auxiliary valve core (10) and a plurality of radial holes (4 b) communicated with the end hole (4 a), the radial holes (4 b) extend to the surface of the static iron core (4) to guide oil in the second flow channel (10 a) into the guide sleeve (1), a part of the surface of the static iron core (4) is in interference fit with the inner wall of the guide sleeve (1), and the other part of the surface of the static iron core (4) is provided with a ventilation groove (4 c).

8. The pilot spool relief valve according to claim 1 wherein a vent hole (5 a) is opened in the armature (5), the vent hole (5 a) connecting both end surfaces and side surfaces of the armature (5).

9. Pilot spool relief valve according to claim 1, characterized in that a filter screen (17) is provided on the valve sleeve (2) and on the surface of the pilot port (2 a).

10. Pilot spool relief valve according to claim 1, characterized in that a nut (18) is fitted on the second end of the guide sleeve (1), which nut (18) secures the coil (3) on the guide sleeve (1).