Plug-in type zero-leakage constant-value pressure reducing valve

Abstract

A valve sleeve plug, a spring seat plug, a valve element, a spring seat and a spring are mounted in a valve sleeve through hole of the pressure reducing valve, and a sealing ring is mounted on the valve sleeve plug at the left end of the valve sleeve through hole and used for sealing hydraulic oil at the left end of the valve element; the valve element is provided with an internal acting cavity and a lateral oil flowing channel, and oil ways can be communicated conveniently. A sealing ring is installed at the right end of the outer circle face of the valve element and used for guaranteeing that hydraulic oil cannot be discharged through the right end of the valve element in the valve element moving process, and the zero-leakage function of the pressure reducing valve is achieved. The right end of the valve element is connected with a spring seat, and a spring is arranged between the spring seat and a spring seat plug at the right end of the valve sleeve through hole. The plug-in mounting type zero-leakage constant-value pressure reducing valve has the functions of zero leakage and adjustable pressure reducing range, solves the problem that the outlet pressure of the pressure reducing valve is attenuated or unstable, and is simple in structural design and convenient to debug and mount.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, and in particular to a plug-in type zero-leakage fixed-value pressure reducing valve. Background Art

[0002] Pressure reducing valves are generally used in the pressure reducing and pressure maintaining circuits of hydraulic systems. The pressure output after pressure reduction needs to be stable and able to maintain pressure for a long time. According to different regulation requirements, pressure reducing valves are divided into fixed ratio pressure reducing valves, fixed value pressure reducing valves and fixed differential pressure reducing valves. Among them, fixed value pressure reducing valves are the most widely used type of pressure reducing valves. Their function is to reduce the oil pressure of a certain circuit in the hydraulic system, so that a certain part of the hydraulic system can obtain a stable pressure lower than the oil supply or input pressure.

[0003] The outlet pressure of the fixed-value pressure reducing valve is also related to the load. If the pressure established by the load is lower than the set pressure, the outlet pressure of the pressure reducing valve is determined by the load. At this time, the pressure reducing valve has no pressure reducing effect. When the outlet pressure load of the pressure reducing valve is very large, the pressure reducing valve is prone to oil leakage, and the leaked oil flows back to the oil tank through the return oil line of the hydraulic system. At this time, the pressure reducing valve is prone to outlet pressure attenuation or outlet pressure instability. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a plug-in zero-leakage fixed-value pressure reducing valve. The zero-leakage design enables the pressure reducing valve to maintain pressure for a long time in large load conditions or in situations where the system pressure maintenance requirements are high. The pressure reducing range of the pressure reducing valve is adjusted by adjusting the effective area of ​​the internal action chamber of the valve core, the preload force of the spring, and the stiffness of the spring. The structure design is simple and the debugging and installation are convenient. The specific technical scheme of the present invention is as follows:

[0005] A plug-in zero-leakage fixed-value pressure reducing valve, comprising a valve sleeve (1), a valve sleeve plug (2), a valve core (5), a spring seat plug (11), a spring seat (9), and a spring (10), wherein:

[0006] The circumference of the valve sleeve (1) adopts a stepped plug-in design, and is used for being plugged and fixed inside the hydraulic system circuit;

[0007] The valve sleeve (1) is provided with a through hole inside, the valve sleeve plug (2) is fixed at the left end of the through hole for limiting the position of the valve core (5); the spring seat plug (11) is fixed at the right end of the through hole for limiting the position of the spring seat (9) and the spring (10);

[0008] The valve core (5) is installed in the through hole, the right end of the valve core (5) is connected to the spring seat (9), the spring (10) is arranged between the spring seat (9) and the spring seat plug (11) at the right end of the through hole of the valve sleeve (1), and the left end of the valve core (5) abuts against the valve sleeve plug (2);

[0009] The valve sleeve plug (2) is provided with a sealing ring groove, in which a sealing ring a (3) is installed, and the sealing ring a (3) is used to seal the hydraulic oil at the left end of the valve core (5) in the through hole of the valve sleeve (1);

[0010] The valve core (5) is provided with an internal working chamber, and a lateral oil flow channel is provided on the outer circumferential surface, wherein the internal working chamber enables the lateral oil flow channel to communicate with the left end of the valve core (5);

[0011] A sealing ring groove is provided at the right end of the outer cylindrical surface of the valve core (5), and a sealing ring d (7) is installed in the groove. The sealing ring d (7) is used to ensure that the hydraulic oil cannot be discharged through the right end of the valve core (5) during the movement of the valve core (5), thereby isolating the hydraulic oil outlet circuit from the hydraulic system return oil circuit, realizing the zero leakage function of the pressure reducing valve, and thus achieving a stable constant pressure output.

[0012] Preferably, the valve sleeve is provided with an oil inlet of a pressure reducing valve and an oil outlet of a pressure reducing valve, the oil inlet of the pressure reducing valve is connected to the hydraulic oil inlet circuit, and thus is connected to the oil supply pressure of the hydraulic system, and the oil outlet of the pressure reducing valve is connected to the hydraulic oil outlet circuit, and thus is connected to the oil output port of the hydraulic system; the lateral oil flow channel on the outer cylindrical surface of the valve core is connected to the oil outlet of the pressure reducing valve, and the lateral oil flow channel is also connected to the oil inlet of the pressure reducing valve when the left end of the valve core presses against the valve sleeve plug.

[0013] Preferably, the outer circular surface of the valve sleeve is provided with three sealing ring grooves, which are respectively equipped with sealing rings b, sealing rings c, and sealing rings e, for achieving sealed isolation between oil circuits; the oil inlet of the pressure reducing valve is arranged between the sealing rings b and the sealing rings c, and the oil outlet of the pressure reducing valve is arranged between the sealing rings e and the sealing rings c.

[0014] Preferably, the valve sleeve has two pressure reducing valve oil inlets, and the two pressure reducing valve oil inlets are symmetrically distributed along the axis of the valve sleeve; the valve sleeve has two pressure reducing valve oil outlets, and the two pressure reducing valve oil outlets are symmetrically distributed along the axis of the valve sleeve.

[0015] Preferably, the internal working chamber of the valve core includes a radial oil hole and an axial oil hole; the radial oil hole is arranged in the middle of the valve core and is communicated with the lateral oil flow channel; the axial oil hole is arranged at the left end of the valve core and is communicated with the radial oil hole, thereby being connected to the lateral oil flow channel.

[0016] Preferably, the radial oil through hole in the middle of the valve core is a cylindrical through hole radially penetrating the valve core, and the axial oil through hole at the left end of the valve core is a stepped hole.

[0017] Preferably, the outer circumferential surface of the valve sleeve is provided with a mounting thread for fixing the pressure reducing valve to the inside of the hydraulic system circuit.

[0018] Preferably, the valve sleeve plug is installed at the left end of the valve sleeve through hole by means of threads.

[0019] Preferably, the spring seat plug is installed at the right end of the valve sleeve through hole through a thread, and the size of the spring preload force can be adjusted.

[0020] Preferably, the spring seat plug is provided with an internal flow channel, and the internal flow channel of the spring seat plug is communicated with the oil return circuit of the hydraulic system, so as to discharge excess gas during the movement of the valve core.

[0021] When the pressure of the hydraulic system enters the hydraulic oil inlet circuit, the hydraulic pressure on the internal action chamber of the valve core increases, pushing the valve core to move to the right, and the valve core drives the spring seat to move together until the hydraulic pressure on the internal action chamber of the valve core and the preload force and spring force on the spring are balanced, thereby achieving a stable constant pressure output. The pressure reducing valve adjusts the fixed pressure range by reasonably designing and adjusting the action area of ​​the internal action chamber of the valve core, the preload force of the spring, and the stiffness of the spring.

[0022] The beneficial effects achieved by the present invention are as follows:

[0023] (1) The plug-in zero-leakage fixed-value pressure reducing valve provided by the present invention has a zero-leakage function, solves the problem of pressure reduction valve outlet pressure attenuation or outlet pressure instability, and is suitable for hydraulic systems with high requirements for output leakage or output pressure maintenance;

[0024] (2) The plug-in zero-leakage fixed-value pressure reducing valve provided by the present invention adjusts the pressure reducing range of the pressure reducing valve by adjusting the effective area of ​​the internal effective chamber of the valve core, the preload force of the spring, and the stiffness of the spring, thereby achieving a relatively stable pressure output;

[0025] (3) The valve sleeve of the plug-in zero-leakage fixed-value pressure reducing valve provided by the present invention adopts a plug-in design, which has a simple and reliable structural design and is easy to debug and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions disclosed in the present invention, the following briefly introduces the drawings required to be used in some embodiments disclosed in the present invention. Obviously, the drawings described below are only drawings of some embodiments disclosed in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments disclosed in the present invention, the actual process of the method, etc.

[0027] Figure 1 It is a schematic diagram of the structure of a plug-in zero-leakage fixed-value pressure reducing valve provided in the present invention.

[0028] The accompanying drawings are marked as follows: 1. valve sleeve; 2. valve sleeve plug; 3. sealing ring a; 4. sealing ring b; 5. valve core; 6. sealing ring c; 7. sealing ring d; 8. sealing ring e; 9. spring seat; 10. spring; 11. spring seat plug. DETAILED DESCRIPTION

[0029] The embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Embodiment 1

[0031] like Figure 1 As shown, a plug-in zero-leakage fixed-value pressure reducing valve provided in the present invention comprises a valve sleeve 1, a valve sleeve plug 2, a spring seat plug 11, a valve core 5, a spring seat 9, and a spring 10, wherein:

[0032] The circumference of the valve sleeve 1 adopts a stepped plug-in design and can be plugged and fixed into the hydraulic system circuit. The outer circumferential surface of the valve sleeve 1 is provided with a mounting thread for fixing the pressure reducing valve into the hydraulic system circuit. The valve sleeve 1 is provided with a pressure reducing valve oil inlet and a pressure reducing valve oil outlet. The pressure reducing valve oil inlet is connected to the hydraulic oil inlet circuit and thus connected to the hydraulic system oil supply pressure. The pressure reducing valve oil outlet is connected to the hydraulic oil outlet circuit and thus connected to the hydraulic system oil output port. There are two pressure reducing valve oil inlets on the valve sleeve 1. The valve sleeve 1 is symmetrically distributed along the axis of the valve sleeve 1; the valve sleeve 1 also has two oil outlets for the pressure reducing valve, which are symmetrically distributed along the axis of the valve sleeve 1; the outer circumferential surface of the valve sleeve 1 is provided with three sealing ring grooves, which are respectively provided with sealing rings b4, c6 and e8, for achieving sealing isolation between oil circuits; the oil inlet of the pressure reducing valve is arranged between the sealing rings b4 and c6, and the oil outlet of the pressure reducing valve is arranged between the sealing rings e8 and c6; the interior of the valve sleeve 1 is provided with a through hole;

[0033] The valve sleeve plug 2 is installed at the left end of the through hole of the valve sleeve 1 by means of threads, and is used to limit the valve core 5; a sealing ring groove is provided on the valve sleeve plug 2, and a sealing ring a3 is installed in the groove, and the sealing ring a3 is used to seal the hydraulic oil at the left end of the valve core 5 in the through hole of the valve sleeve 1;

[0034] The spring seat plug 11 is threadedly mounted on the right end of the through hole of the valve sleeve 1, and is used to limit the spring seat 9 and the spring 10 and adjust the preload force of the spring 10; the spring seat plug 11 is provided with an internal flow channel, and the internal flow channel of the spring seat plug 11 is connected to the oil return line of the hydraulic system, and is used to discharge excess gas during the movement of the valve core 5;

[0035] The right end of the valve core 5 is connected to the spring seat 9, the spring 10 is arranged between the spring seat 9 and the spring seat plug 11 at the right end of the through hole of the valve sleeve 1, and the left end of the valve core 5 bears against the valve sleeve plug 2;

[0036] The outer circumferential surface of the valve core 5 is provided with a lateral oil passage, which is communicated with the oil outlet of the pressure reducing valve, and when the left end of the valve core 5 bears against the valve sleeve plug 2, the lateral oil passage is communicated with the oil inlet of the pressure reducing valve; a radial oil hole is provided in the middle of the valve core 5, and the radial oil hole in the middle of the valve core 5 is a cylindrical through hole that radially penetrates the valve core 5 and is communicated with the lateral oil passage on the outer circumferential surface of the valve core 5; an axial oil hole is provided at the left end of the valve core 5, and the axial oil hole at the left end of the valve core 5 is a stepped hole, which is connected to the radial oil hole in the middle of the valve core 5 The oil hole is connected to the lateral oil passage of the valve core 5, and is connected to the lateral oil passage of the valve core 5; the radial oil hole in the middle of the valve core 5 and the axial oil hole at the left end of the valve core 5 together constitute the internal action chamber of the valve core 5; the right end of the outer cylindrical surface of the valve core 5 is provided with a sealing ring groove, and a sealing ring d7 is installed in the groove, and the sealing ring d7 is used to ensure that the hydraulic oil cannot be discharged through the right end of the valve core 5 during the movement of the valve core 5, and isolate the hydraulic oil outlet circuit from the hydraulic system return oil circuit, so as to realize the zero leakage function of the pressure reducing valve, thereby realizing a stable constant pressure output;

[0037] When the pressure of the hydraulic system enters the hydraulic oil inlet circuit, the hydraulic pressure on the internal action chamber of the valve core 5 increases, pushing the valve core 5 to move rightward, and the valve core 5 drives the spring seat 9 to move together, until the hydraulic pressure on the internal action chamber of the valve core 5 and the preload force and spring force of the spring 10 are balanced, thereby achieving a stable constant pressure output. The pressure reducing valve adjusts the fixed pressure range by reasonably designing and adjusting the action area of ​​the internal action chamber of the valve core 5, the preload force of the spring 10, and the stiffness of the spring 10.

[0038] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A plug-in zero-leakage fixed-value pressure reducing valve, characterized in that: The pressure reducing valve comprises a valve sleeve (1), a valve sleeve plug (2), a valve core (5), a spring seat plug (11), a spring seat (9), and a spring (10), wherein: The circumference of the valve sleeve (1) adopts a stepped plug-in design, and is used for being plugged and fixed inside the hydraulic system circuit; The valve sleeve (1) is provided with a through hole inside, the valve sleeve plug (2) is fixed at the left end of the through hole for limiting the position of the valve core (5); the spring seat plug (11) is fixed at the right end of the through hole for limiting the position of the spring seat (9) and the spring (10); The valve core (5) is installed in the through hole, the right end of the valve core (5) is connected to the spring seat (9), the spring (10) is arranged between the spring seat (9) and the spring seat plug (11) at the right end of the through hole of the valve sleeve (1), and the left end of the valve core (5) abuts against the valve sleeve plug (2); The valve sleeve plug (2) is provided with a sealing ring groove, in which a sealing ring a (3) is installed, and the sealing ring a (3) is used to seal the hydraulic oil at the left end of the valve core (5) in the through hole of the valve sleeve (1); The valve core (5) is provided with an internal working chamber, and a lateral oil flow channel is provided on the outer circumferential surface, wherein the internal working chamber enables the lateral oil flow channel to communicate with the left end of the valve core (5); A sealing ring groove is provided at the right end of the outer cylindrical surface of the valve core (5), and a sealing ring d (7) is installed in the groove. The sealing ring d (7) is used to ensure that the hydraulic oil cannot be discharged through the right end of the valve core (5) during the movement of the valve core (5), thereby isolating the hydraulic oil outlet circuit from the hydraulic system return oil circuit, realizing the zero leakage function of the pressure reducing valve, and thus achieving a stable constant pressure output.

2. A plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The valve sleeve (1) is provided with a pressure reducing valve oil inlet and a pressure reducing valve oil outlet. The pressure reducing valve oil inlet is connected to a hydraulic oil inlet circuit, thereby being connected to the hydraulic system oil supply pressure. The pressure reducing valve oil outlet is connected to a hydraulic oil outlet circuit, thereby being connected to the hydraulic system oil output port. The lateral oil flow passage on the outer cylindrical surface of the valve core (5) is in communication with the oil outlet of the pressure reducing valve, and the lateral oil flow passage is also in communication with the oil inlet of the pressure reducing valve when the left end of the valve core (5) abuts against the valve sleeve plug (2).

3. A plug-in zero-leakage fixed-value pressure reducing valve according to claim 2, characterized in that: The outer circumferential surface of the valve sleeve (1) is provided with three sealing ring grooves, which are respectively provided with sealing rings b (4), c (6) and e (8) for achieving sealing isolation between oil circuits; The oil inlet of the pressure reducing valve is arranged between the sealing ring b (4) and the sealing ring c (6), and the oil outlet of the pressure reducing valve is arranged between the sealing ring e (8) and the sealing ring c (6).

4. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 2, characterized in that: The valve sleeve (1) has two pressure reducing valve oil inlets, and the two pressure reducing valve oil inlets are symmetrically distributed along the axis of the valve sleeve (1); the valve sleeve (1) has two pressure reducing valve oil outlets, and the two pressure reducing valve oil outlets are symmetrically distributed along the axis of the valve sleeve (1).

5. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The internal action chamber of the valve core (5) comprises a radial oil hole and an axial oil hole. The radial oil hole is arranged in the middle of the valve core (5) and communicates with the lateral oil flow channel. The axial oil hole is arranged at the left end of the valve core (5) and communicates with the radial oil hole, thereby connecting with the lateral oil flow channel.

6. A plug-in zero-leakage fixed-value pressure reducing valve according to claim 5, characterized in that: The radial oil through hole in the middle of the valve core (5) is a cylindrical through hole that radially penetrates the valve core (5), and the axial oil through hole at the left end of the valve core (5) is a stepped hole.

7. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The outer circumferential surface of the valve sleeve (1) is provided with a mounting thread for fixing the pressure reducing valve to the inside of the hydraulic system circuit.

8. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The valve sleeve plug (2) is installed at the left end of the through hole of the valve sleeve (1) via threads.

9. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The spring seat plug (11) is installed at the right end of the through hole of the valve sleeve (1) through a thread, and can adjust the size of the preload force of the spring (10).

10. The plug-in zero-leakage fixed-value pressure reducing valve according to claim 1, characterized in that: The spring seat plug (11) is provided with an internal flow channel, and the internal flow channel of the spring seat plug (11) is communicated with the oil return circuit of the hydraulic system and is used to discharge excess gas during the movement of the valve core (5).

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