Embedded pressure compensation type flow control valve

Abstract

The utility model relates to the technical field of fluid control, in particular to an embedded pressure compensation type flow control valve which is suitable for achieving flow control of fluid in an insertion hole. The flow control valve comprises a valve sleeve, a valve element, a spring and a check ring for a hole. The valve sleeve is of a tubular structure, pipe threads are arranged on the surface of the valve sleeve, one end of the valve sleeve is closed, a fluid inlet allowing fluid to enter is formed in the other end of the valve sleeve, a containing space is formed in the valve body, and the spring, the valve element and the hole check ring are sequentially installed in the containing space. Wherein the check ring for the hole is fixedly installed, the valve element is installed in a sliding mode, the spring is supported between the closed end of the valve sleeve and the valve element, and a plurality of throttling holes are formed in the surface of the valve sleeve in the circumferential direction. The flow control valve has the advantages that the structure is simple, installation is convenient, stable flow output can be kept under different pressures, and the accuracy and reliability of fluid control are improved.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to an embedded pressure-compensated flow control valve suitable for realizing flow control of a fluid in a socket. Background Art

[0002] The flow control valve is a valve that controls the flow of the throttle port by changing the size of the throttle port fluid resistance under a certain pressure difference, thereby adjusting the fluid flow in the actuator (hydraulic cylinder or hydraulic motor). It mainly includes throttle valves, speed control valves, overflow throttle valves, and flow dividing and collecting valves, etc.

[0003] The core working principle of the flow control valve is to adjust and control the flow of the medium in the pipeline by changing the flow cross-sectional area of ​​the valve. When the fluid passes through the valve, the valve core is affected by the fluid pressure and the spring force. Under normal working conditions, the position of the valve core is automatically adjusted according to the set flow value and the actual fluid pressure. When the fluid pressure increases, the valve core will move upward, reduce the valve opening, and thus limit the flow; conversely, when the fluid pressure decreases, the valve core will move downward, increase the valve opening, and increase the flow. In this way, no matter how the load or inlet pressure changes, the valve can maintain the pre-set flow.

[0004] The pressure-compensated flow control valve controls the flow by sensing the change in fluid pressure and adjusting the position of the valve core. When the inlet fluid exceeds the valve flow setting, the force generated by the pressure difference at the valve core will exceed the spring force, thereby moving the compensator valve core to suppress or restrict the fluid, ensuring that the pre-set flow can flow stably through the valve. This pressure compensation function enables the valve to control the flow more accurately in complex hydraulic systems. This valve is widely used in hydraulic systems where stable flow is required, such as machine tools, injection molding machines, excavators and other equipment.

[0005] The existing pressure compensation flow control valve has problems such as complex structure and inconvenient installation, and is not adaptable to pressure changes, making it difficult to maintain a stable flow output under different pressures. Therefore, it is necessary to develop a flow control valve with a simple structure, easy installation, and capable of achieving pressure compensation. Summary of the invention

[0006] The present application provides an embedded pressure-compensated flow control valve, which has a simple structure, is easy to install, and can maintain a stable flow output under different pressures.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] An embedded pressure-compensated flow control valve comprises: a valve sleeve, a valve core, a spring and a hole retaining ring; the valve sleeve is a tubular structure and its surface is provided with a pipe thread, one end of the valve sleeve is closed, and the other end forms an inlet for fluid to pass through, the interior of the valve sleeve forms a accommodating space, and the spring, valve core and hole retaining ring are installed in the accommodating space in sequence; wherein the hole retaining ring is fixedly installed, the valve core is slidably installed, the spring is supported between the closed end of the valve sleeve and the valve core, and a plurality of throttling holes are provided on the surface of the valve sleeve along the circumferential direction.

[0009] Furthermore, one end of the valve core is open and the other end is provided with a sealing plate, a flow hole connected to the inlet is provided on the sealing plate, a first guide hole is formed inside the valve core, and the aperture of the first guide hole matches the outer diameter of the spring.

[0010] Furthermore, by designing the number and diameter of the throttling holes and the stiffness of the spring, the flow control valve has a flow adjustment range of 4 L / min to 20 L / min.

[0011] Furthermore, the outer surface of the valve core includes a fourth pipe segment and a fifth pipe segment, the fifth pipe segment is arranged at the open end of the valve core, the valve sleeve includes a first hole segment that cooperates with the valve core, the outer diameter of the fourth pipe segment matches the inner diameter of the first hole segment, a gap is formed between the fifth pipe segment and the first hole segment, and an anti-lock hole is opened on the fifth pipe segment.

[0012] Furthermore, a plurality of annular sealing grooves are provided on the fourth pipe section, and sealing members are installed in the sealing grooves.

[0013] Furthermore, a second guide hole is provided at the closed end of the valve sleeve, and the aperture of the second guide hole matches the outer diameter of the spring.

[0014] Furthermore, a CN co-diffusion layer is provided on the surface of the valve core.

[0015] Furthermore, the spring is subjected to anti-corrosion treatment.

[0016] Furthermore, at least one end portion of the valve sleeve is provided with a mounting groove.

[0017] Furthermore, the valve sleeve and the valve core are both made of 1144 free-cutting steel.

[0018] The advantages of the present application are that it has a simple structure, is easy to install, and can maintain a stable flow output under different pressures, thereby improving the accuracy and reliability of fluid control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1According to some embodiments of the present application, a schematic structural diagram of an embedded pressure-compensated flow control valve is shown;

[0020] Figure 2 According to some embodiments of the present application, it is shown Figure 1 A cross-sectional view of

[0021] Figure 3 According to some embodiments of the present application, a schematic structural diagram of a valve sleeve is shown;

[0022] Figure 4 According to some embodiments of the present application, a schematic diagram of the structure of the valve core is shown;

[0023] Figure 5 According to some embodiments of the present application, a schematic diagram of the structure of the flow control valve when the throttle opening is reduced is shown;

[0024] Figure 6 According to some embodiments of the present application, a schematic diagram of the matching structure of the flow control valve and the socket is shown. DETAILED DESCRIPTION

[0025] The following is a more detailed description of the technical features and advantages of the present application in conjunction with the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] It should be noted that, in the description of the present application, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the importance of the technical features shown.

[0028] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1-Figure 5, a schematic structural diagram of an embedded pressure-compensated flow control valve provided in an embodiment of the present application, the flow control valve comprises a valve sleeve 10, a valve core 20, a spring 30 and a hole retaining ring 40; one end of the valve sleeve 10 is closed and the other end is open, forming an inlet 101 for fluid to pass through, a receiving space 106 is formed inside the valve sleeve 10, the spring 30, the valve core 20 and the hole retaining ring 40 are sequentially installed in the receiving space 106, wherein the hole retaining ring 40 is fixedly installed, the valve core 20 is slidably installed, the valve core 20 can slide in the valve sleeve 10, the hole retaining ring 40 limits the sliding position of the valve core 20 on one side of the axial direction, and the spring 30 is supported between the closed end of the valve sleeve 10 and the valve core 20; a plurality of throttling holes 102 are evenly arranged on the valve sleeve 10 along the circumferential direction, the fluid enters the interior of the valve sleeve 10 from the inlet 101, and then flows out from the throttling holes 102. The position of the valve core 20 is determined by the pressure difference between the inlet 101 and the throttle hole 102 (load end), and will be automatically adjusted according to the set flow value and the actual fluid pressure. Specifically, when the fluid pressure of the inlet 101 increases, the valve core 20 will overcome the resistance of the spring 30 and move upward. The movement of the valve core 20 reduces the opening of the throttle hole 102, thereby limiting the flow; conversely, when the fluid pressure of the inlet 101 decreases, the valve core 20 will move downward under the elastic force of the spring 30, thereby increasing the opening of the throttle hole 102 and increasing the flow. In this way, no matter how the load or inlet pressure changes, the flow control valve of this embodiment can maintain a pre-set flow. By designing the number and diameter of the throttle holes 102 and the stiffness of the spring 30, the flow control range of the flow control valve of this embodiment is 4L / min-20L / min.

[0030] See also Figure 3, is a schematic diagram of the structure of the valve sleeve 10 of this embodiment, wherein a first hole section 103 and a second guide hole 104 are formed inside the valve sleeve 10, wherein the aperture of the first hole section 103 matches the outer diameter of the valve core 20, and is used to form a sliding fit with the valve core 20; the second guide hole 104 matches the outer diameter of the spring 30, and is used to support and guide the spring 30. The throttle hole 102 is opened at a position of the first hole section 103 close to the second guide hole 104, and a retaining ring installation groove 105 is provided on one side of the first hole section 103 close to the inlet 101, and is used to install the hole retaining ring 40. The valve sleeve 10 is a tubular structure, and its outer surface includes a first pipe section 107, a second pipe section 108 and a third pipe section 109. The outer diameters of the first pipe section 107, the second pipe section 108 and the third pipe section 109 increase in sequence. The first pipe section 107 is arranged corresponding to the closed end of the valve sleeve 10, the second pipe section 108 is arranged between the first pipe section 107 and the third pipe section 109, and the throttle hole 102 is arranged in the second pipe section 108. In order to reduce the influence of fluid viscosity on flow control, the throttle hole 102 should be a thin-walled structure. In this embodiment, the wall thickness of the second pipe section 108 is set to 1.5 mm. The third pipe section 109 is provided with a pipe thread for connecting the jack. In order to facilitate installation, the first pipe section 107 can be designed as a cone with a large end and a small end.

[0031] See also Figure 4 , is a schematic diagram of the structure of the valve core 20 of this embodiment. The valve core 20 is provided with an opening at one end facing the spring 30 and a sealing plate 202 at the other end. The sealing plate 202 is used to withstand the pressure of the fluid and drive the valve core 20 to slide. The sealing plate 202 is provided with a flow hole 203 connected to the inlet 101. The valve core 20 is provided with a first guide hole 201 inside. The first guide hole 201 is used to install the spring 30. After the fluid passes into the valve sleeve 10 from the inlet 101, it passes into the first guide hole 201 from the flow hole 202. The outer surface of the valve core 20 forms a fourth pipe section 205, and the outer diameter of the fourth pipe section 205 matches the aperture of the first hole section 103 inside the valve sleeve 10; preferably, the outer surface of the valve core 20 is also provided with a fifth pipe section 204, the pipe diameter of the fifth pipe section 204 is smaller than that of the fourth pipe section 205, a gap is formed between the fifth pipe section 204 and the first hole section 103 of the valve sleeve 10, and an anti-lock hole 206 is provided on the fifth pipe section 204. When the valve is working normally, as the valve core 20 slides, the fourth pipe section 205 covers part of the throttling hole 102 to change its opening. The provision of the anti-lock hole 206 can prevent the valve core 20 from being locked when the fluid flow is small. In order to achieve fluid sealing, at least one annular sealing groove 207 can be provided on the fourth pipe section 205 along the circumferential direction, and a sealing member is installed in the sealing groove 207 to achieve fluid sealing between the valve sleeve 10 and the valve core 20.

[0032] See also Figure 2, which is a schematic diagram of the flow control valve of this embodiment when the throttle hole 102 is at its maximum opening, please refer to Figure 5 , which is a schematic diagram of the flow control valve of this embodiment when the opening of the throttle hole 102 is reduced.

[0033] See also Figure 6 , is a schematic diagram of the installation of the flow control valve of this embodiment. The flow control valve is installed in the socket through the pipe thread 109 on the outside of the valve sleeve 10, forming an embedded installation in the socket. It has a simple structure, small size, and convenient installation. It is particularly suitable for being installed in the socket to realize the flow control of the fluid. In order to facilitate the installation of the flow control valve in the socket, at least one end of the valve sleeve 10 is provided with an installation slot to facilitate the screwing operation of the valve in the socket. In this embodiment, the first installation slot 110 and the second installation slot 111 are respectively provided at both ends of the valve sleeve 10, so that the valve can be installed or removed in two directions of the socket.

[0034] The valve sleeve 10, valve core 20, spring 30 and hole retaining ring 40 of this embodiment can all be made of existing materials, and their shapes and sizes can be designed and adjusted according to actual needs. Preferably, in this embodiment, the valve sleeve 10 and valve core 20 are made of 1144 free-cutting steel, which is medium carbon free-cutting steel, also known as easy-cutting iron. Its chemical composition mainly includes carbon C (0.37-0.45), silicon Si (0.15-0.35), manganese Mn (1.20-1.55), sulfur S (0.20-0.30) and phosphorus P (≤0.04). This material has excellent processing performance and electroplating performance, which can improve the service life of the valve sleeve 10 and valve core 20 of this embodiment, and the spring 30 and hole retaining ring 40 can use commercially available standard parts.

[0035] When assembling the flow control valve of this embodiment, first put the spring 30 into the valve sleeve 10, insert one end of the spring 30 into the second guide hole 104, then put the valve core 20 into the valve sleeve 10, insert the other end of the spring 30 into the first guide hole 201, and then fix the hole retaining ring 40 in the retaining ring installation groove 105 of the valve sleeve 10 to complete the assembly.

[0036] During use, the fluid enters the valve sleeve 10 from the inlet 101 and flows out through the throttle hole 102. The fluid pressure difference between the inlet 101 and the throttle hole 102 determines the position of the valve core 20, that is, the opening of the throttle hole 102. When the fluid pressure at the inlet 101 increases, the valve core 20 will overcome the resistance of the spring 30 and slide toward the throttle hole 102, thereby reducing the opening of the throttle hole 102 and limiting the flow rate. Conversely, when the fluid pressure at the inlet 101 decreases, the valve core 20 will slide toward the inlet 101 under the force of the spring 30, increasing the opening of the throttle hole 102, thereby increasing the flow rate.

[0037] Preferably, a CN co-diffusion layer, i.e., carbonitriding, can also be provided on the surface of the valve core 20 of the present embodiment. It is a technology that simultaneously infiltrates carbon and nitrogen into the metal surface at high temperature. Through this technology, a layer of carbonitriding compounds can be formed on the surface of the metal valve core 20. To improve the hardness of the surface of the valve core 20, thereby enhancing the wear resistance of the surface of the valve core 20, making it less susceptible to wear when subjected to friction. Secondly, the co-diffusion layer can also improve the corrosion resistance of the valve core 20, which helps it resist the erosion of various corrosive substances in the fluid and prolong its service life. In addition, the carbonitriding layer can also improve the fatigue life of the valve core 20, allowing it to maintain good performance under long-term repeated stress. The thickness of the above-mentioned CN co-diffusion layer can be set between 0.3-0.5mm.

[0038] In this way, the present invention can achieve precise control of fluid flow, and has a simple structure, easy installation, and high practicality and promotion value.

[0039] In the description of this specification, the description with reference to the terms "some embodiments", "some examples", "exemplarily", "example", "preferably", or "further" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An embedded pressure-compensated flow control valve, characterized in that: include: A valve sleeve, a valve core, a spring and a hole retaining ring; the valve sleeve is a tubular structure and its surface is provided with a pipe thread, one end of the valve sleeve is closed, and the other end forms an inlet for fluid to pass through, the interior of the valve sleeve forms a accommodating space, and the spring, valve core and hole retaining ring are installed in the accommodating space in sequence; wherein the hole retaining ring is fixedly installed, the valve core is slidably installed, the spring is supported between the closed end of the valve sleeve and the valve core, and a plurality of throttling holes are provided on the surface of the valve sleeve along the circumferential direction.

2. The flow control valve according to claim 1, characterized in that: One end of the valve core is open and the other end is provided with a sealing plate, the sealing plate is provided with a flow hole connected to the inlet, and a first guide hole is formed inside the valve core, and the aperture of the first guide hole matches the outer diameter of the spring.

3. The flow control valve according to claim 1, characterized in that: By designing the number and diameter of the throttling holes and the stiffness of the spring, the flow rate adjustment range of the flow control valve is 4L / min to 20L / min.

4. The flow control valve according to claim 1, characterized in that: The outer surface of the valve core includes a fourth pipe segment and a fifth pipe segment, the fifth pipe segment is arranged at an open end of the valve core, the valve sleeve includes a first hole segment that cooperates with the valve core, the outer diameter of the fourth pipe segment matches the inner diameter of the first hole segment, a gap is formed between the fifth pipe segment and the first hole segment, and an anti-lock hole is opened on the fifth pipe segment.

5. The flow control valve according to claim 4, characterized in that: The fourth pipe section is provided with a plurality of annular sealing grooves, and sealing members are installed in the sealing grooves.

6. The flow control valve according to claim 2, characterized in that: A second guide hole is arranged at the closed end of the valve sleeve, and the diameter of the second guide hole matches the outer diameter of the spring.

7. The flow control valve according to claim 1, characterized in that: A CN co-diffusion layer is provided on the surface of the valve core.

8. The flow control valve according to claim 1, characterized in that: The spring is subjected to anti-corrosion treatment.

9. The flow control valve according to claim 1, characterized in that: At least one end portion of the valve sleeve is provided with a mounting groove.

10. The flow control valve according to claim 1, characterized in that: The valve sleeve and the valve core are both made of 1144 free-cutting steel.

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