Hydraulic control valve and hydraulic system

Abstract

The present invention discloses a hydraulic control valve and a hydraulic system, which relate to the technical field of control valves, and include: a main valve body, wherein the middle portion of the main valve body has an L-shaped channel that passes through the main valve body, and the side portion of the main valve body is fixedly connected to a side valve body, and the fluid in the channel can flow from top to bottom and from left to right; a valve seat, which is embedded in the horizontal part of the channel; a valve stem, which slides horizontally and passes through the main valve body; a valve core, which is connected to the end of the valve stem; a valve seat protection cylinder, which is fixedly sleeved on the outside of the valve stem, and when the valve core is away from the valve seat, the valve seat protection cylinder can fit with the valve seat and provide protection for the valve seat; a valve core protection assembly, which is arranged in the side valve body, and when the valve seat protection cylinder fits with the valve seat, the valve core is accommodated in the valve core protection assembly, and through the synchronous protection of the valve core and the valve seat, all-round protection of the hydraulic control valve is achieved, so that the hydraulic system can operate stably for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, in particular to a hydraulic control valve and a hydraulic system. Background Art

[0002] Hydraulic control valve refers to the component used to control the pressure, flow and direction of the liquid in the hydraulic transmission system or hydraulic control system. The one that controls pressure is called pressure control valve, the one that controls flow is called flow control valve, and the one that controls on, off and flow direction is called directional control valve.

[0003] In the hydraulic system, high pressure environment is one of its prominent features. This high pressure not only drives various hydraulic components to operate efficiently, but also brings strict requirements and tests to system components. Under such high pressure conditions, the fluid in the system flows at a very high energy state, providing strong power support for mechanical equipment.

[0004] However, long-term high-load operation will inevitably produce debris, which may come from impurities in the fluid, particles produced by component wear, or residues left by improper system maintenance. These debris, driven by high-pressure fluid, are like a group of micro "bullets", posing a continuous impact threat to key components in the system, especially valve cores and valve seats.

[0005] As the core component for regulating and controlling fluid flow, the valve core is directly exposed to the impact of such high-pressure debris flow for a long time. Its surface material is easily worn and may even cause shape changes, which in turn affects the regulation accuracy and sealing effect. Similarly, the valve seat, as a key link in sealing, also faces the same wear risk. Once the matching clearance between the valve core and the valve seat increases due to wear, it is difficult to maintain a good sealing state under high-pressure environment, resulting in fluid leakage, affecting the overall performance and safety of the system.

[0006] It is true that there are protective devices for valve cores, but these protections are not comprehensive and there are still exposed areas. More importantly, these solutions often ignore the protection of the valve seat. In fact, the sealing effect depends on the close fit between the valve core and the valve seat. When the valve seat is worn, even if the valve core is protected, there may still be a risk of leakage, which will affect the overall performance of the valve body.

[0007] Therefore, it is necessary to provide a hydraulic control valve and a hydraulic system to solve the above problems. Summary of the invention

[0008] In order to solve the above problems, the present invention provides the following technical solutions: a hydraulic control valve, comprising:

[0009] A main valve body, wherein the middle portion thereof has an L-shaped passage that penetrates the main valve body, and the side portion of the main valve body is fixedly connected to a side valve body, and the fluid in the passage can flow from top to bottom and from left to right;

[0010] a valve seat embedded in a horizontal portion of the passage;

[0011] A valve stem, which horizontally slides and penetrates the main valve body;

[0012] A valve core connected to the end of the valve stem;

[0013] A valve seat protection sleeve, which is fixedly sleeved on the outside of the valve stem, and when the valve core is away from the valve seat, the valve seat protection sleeve can be attached to the valve seat and provide protection for it;

[0014] A valve core protection component is arranged in the side valve body, and when the valve seat protection cylinder is in contact with the valve seat, the valve core is accommodated in the valve core protection component.

[0015] Further, as a preference, a horn surface, a first mating surface and a second mating surface are formed in sequence from left to right inside the valve seat, wherein the horn surface and the first mating surface are used to fit with the valve seat protection tube;

[0016] The first mating surface and the second mating surface are used to fit with the valve core.

[0017] Further, as a preference, the outer surface of the valve seat protection cylinder is formed with a first protection surface and a second protection surface in sequence from left to right, wherein the first protection surface is used to fit with the horn surface, and the second protection surface is used to fit with the first mating surface.

[0018] Further, as a preference, a second sealing surface is formed in the middle of the outer surface of the valve core, first sealing surfaces are formed on both sides of the second sealing surface, and a protective surface is formed on the side of the first sealing surface away from the second sealing surface, wherein the first sealing surface is used to fit with the first mating surface, and the second sealing surface is used to fit with the second mating surface.

[0019] Further, preferably, the valve core protection assembly comprises a protection groove, the notch of the protection groove faces the valve seat, and the outside of the protection groove is connected to the side valve body by an annular seat.

[0020] Further, as a preference, a slide groove is provided in the protection groove, a slide plate is provided in the slide groove for sliding along the axial direction of the protection groove, and a spring is fixed on a side of the slide plate close to the valve seat.

[0021] Further, preferably, an annular groove is provided in the inner wall of the protection groove, and a second annular capsule is embedded in the annular groove, and the second capsule is used to fit the junction of the first sealing surface and the protection surface;

[0022] A first sac is arranged between the slide plate and the protection groove, and the first sac is connected with the second sac via a pipeline.

[0023] Further, preferably, two symmetrically arranged connectors are embedded in the middle of the valve core for connecting to the valve stem.

[0024] Further, as a preference, a valve stem seat is fixed to a side of the main valve body away from the side valve body, a sealing sleeve is embedded in the valve stem seat, the valve stem is connected to the driving device after sliding through the valve stem seat, and the valve stem seat and the sealing sleeve are in dynamic sealing cooperation;

[0025] The external thread of the valve stem seat is connected with a threaded seat, and the threaded seat limits the sealing sleeve through a pressure seat.

[0026] A hydraulic system comprises a hydraulic control valve, wherein the hydraulic control valve is the hydraulic control valve mentioned above.

[0027] Compared with the prior art, the present invention provides a hydraulic control valve and a hydraulic system, which have the following beneficial effects:

[0028] In the present invention, by providing a valve seat protection cylinder, the direct impact of high-pressure fluid and debris in the fluid on the valve seat is effectively reduced, the service life of the valve seat is extended, and the stability and reliability of the system are improved. The provision of the valve core protection assembly allows the valve core to be completely accommodated therein, avoiding the direct impact of high-pressure fluid and debris, and reducing the wear rate of the valve core. In other words, by synchronously protecting the valve core and the valve seat, all-round protection of the hydraulic control valve is achieved, so that the hydraulic system can operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a hydraulic control valve Figure 1 ;

[0030] Figure 2 A schematic diagram of the structure of a hydraulic control valve Figure 2 ;

[0031] Figure 3 It is a structural schematic diagram of a valve core in a hydraulic control valve;

[0032] Figure 4 It is a structural schematic diagram of a valve seat protection cylinder and a valve seat in a hydraulic control valve;

[0033] Figure 5It is a structural schematic diagram of a valve seat in a hydraulic control valve;

[0034] Figure 6 It is a structural schematic diagram of a valve seat protection cylinder in a hydraulic control valve;

[0035] Figure 7 It is a structural schematic diagram of a valve core protection component in a hydraulic control valve;

[0036] Figure 8 It is a schematic diagram of the fluid flow direction in a hydraulic control valve;

[0037] In the figure: 1. main valve body; 2. valve seat; 3. side valve body; 4. valve stem; 5. valve core; 6. valve core protection assembly; 7. valve stem seat; 8. sealing sleeve; 9. pressure seat; 10. threaded seat; 11. driving device; 12. valve seat protection cylinder; 51. first sealing surface; 52. second sealing surface; 53. protective surface; 54. connector; 21. horn surface; 22. first matching surface; 23. second matching surface; 121. first protective surface; 122. second protective surface; 61. protective groove; 62. annular seat; 63. slide groove; 64. first bladder; 65. slide plate; 66. spring; 67. pipeline; 68. second bladder. DETAILED DESCRIPTION

[0038] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0039] Example: Please refer to Figure 1-Figure 8 Currently, there are protective devices for valve cores, but these protections are not comprehensive and there are still exposed areas. More importantly, these solutions often ignore the protection of the valve seat. In fact, the sealing effect depends on the close fit between the valve core and the valve seat. When the valve seat is worn, even if the valve core is protected, there may still be a risk of leakage, which will affect the overall performance of the throttle valve. In an embodiment of the present invention, a hydraulic control valve is provided, including:

[0040] A main valve body 1, wherein the middle portion thereof has an L-shaped channel that passes through the main valve body 1, and the side portion of the main valve body 1 is fixedly connected to a side valve body 3, and the fluid in the channel can flow from top to bottom and from left to right;

[0041] a valve seat 2, which is embedded in the horizontal part of the channel;

[0042] A valve stem 4, which horizontally slides and penetrates the main valve body 1;

[0043] A valve core 5 connected to the end of the valve stem 4;

[0044] A valve seat protection tube 12, which is fixedly sleeved on the outside of the valve stem 4, and when the valve core 5 is away from the valve seat 2, the valve seat protection tube 12 can fit the valve seat 2 and provide protection for it;

[0045] The valve core protection component 6 is disposed in the side valve body 3 , and when the valve seat protection cylinder 12 is in contact with the valve seat 2 , the valve core 5 is accommodated in the valve core protection component 6 .

[0046] It is necessary to introduce that Figure 1 A schematic diagram of the structure of a hydraulic control valve Figure 1 , which shows the hydraulic control valve in the closed state; Figure 2 A schematic diagram of the structure of a hydraulic control valve Figure 2 , which shows the hydraulic control valve in the open state.

[0047] like Figure 2 In the open state, the valve core 5 is driven by the valve stem 4 to maintain a certain distance from the valve seat 2. At the same time, the valve seat protection tube 12 is tightly fitted with the valve seat 2, providing additional protection for the valve seat 2 to prevent the high-pressure fluid and debris in the fluid from directly impacting the valve seat 2. At the same time, the valve core 5 is completely accommodated in the valve core protection assembly 6, which also avoids the impact of the high-pressure fluid and debris in the fluid.

[0048] In addition, when the state of the hydraulic control valve needs to be adjusted, the valve stem 4 is pushed to slide horizontally by the driving device 11, thereby driving the valve core 5 to move closer to or away from the valve seat 2. Figure 1 ), forming an effective seal to prevent fluid leakage.

[0049] In this embodiment, the valve seat 2 has a horn surface 21, a first mating surface 22 and a second mating surface 23 formed therein from left to right, wherein the horn surface 21 and the first mating surface 22 are used to fit with the valve seat protection tube 12;

[0050] The first mating surface 22 and the second mating surface 23 are used to fit with the valve core 5 .

[0051] The close fit between the valve seat protection tube 12 and the horn surface 21 and the first mating surface 22 of the valve seat 2 effectively prevents the high-pressure fluid and debris in the fluid from directly impacting the valve seat 2, thereby extending the service life of the valve seat 2.

[0052] A second sealing surface 52 is formed in the middle of the outer surface of the valve core 5, and first sealing surfaces 51 are formed on both sides of the second sealing surface 52. A protective surface 53 is formed on the side of the first sealing surface 51 away from the second sealing surface 52, wherein the first sealing surface 51 is used to fit with the first mating surface 22, and the second sealing surface 52 is used to fit with the second mating surface 23.

[0053] That is to say, the bell surface 21, the first mating surface 22 and the second mating surface 23 in the valve seat 2 have different functions, among which the first mating surface 22 is the main mating surface. More specifically, the first mating surface 22 is not only used to fit with the valve seat protection tube 12, but also used to fit with the valve core 5; therefore, the first mating surface 22 needs to be further protected.

[0054] Among them, in order to achieve further protection for the first mating surface 22, in this embodiment, the outer surface of the valve seat protection tube 12 is formed with a first protective surface 121 and a second protective surface 122 from left to right, wherein the first protective surface 121 is used to fit with the trumpet surface 21, and the second protective surface 122 is used to fit with the first mating surface 22.

[0055] The first protection surface 121 and the second protection surface 122 of the valve seat protection tube 12 are tightly fitted with the trumpet surface 21 and the first mating surface 22 of the valve seat 2 respectively. This double protection design effectively reduces the direct impact of high-pressure fluid and debris in the fluid on the valve seat 2, and significantly extends the service life of the valve seat 2.

[0056] More specifically, in order to achieve direct impact of the high-pressure fluid and debris in the fluid on the first mating surface 22, the high-pressure fluid and debris in the fluid need to gradually erode the first protective surface 121 and the horn surface 21 until breaking through the first protective surface 121 and the horn surface 21, which obviously requires an extremely long breakthrough cycle. In addition, the first mating surface 22 is protected by the second protective surface 122, so it is more stable and reliable. Therefore, in this embodiment, the first protective surface 121 and the second protective surface 122 of the valve seat protection tube 12 are closely fitted with the horn surface 21 and the first mating surface 22 of the valve seat 2, respectively, which can effectively avoid the impact of the high-pressure fluid and debris in the fluid on the first mating surface 22.

[0057] In order to protect the first sealing surface 51 , the valve core protection component 6 includes a protection groove 61 , the notch of the protection groove 61 faces the valve seat 2 , and the outside of the protection groove 61 is connected to the side valve body 3 through an annular seat 62 .

[0058] In addition, a slide groove 63 is provided in the protection groove 61 , a slide plate 65 is provided in the slide groove 63 for sliding along the axial direction of the protection groove 61 , and a spring 66 is fixed to a side of the slide plate 65 close to the valve seat 2 .

[0059] The inner wall of the protection groove 61 is provided with an annular groove, in which a second annular capsule 68 is embedded, and the second capsule 68 is used to fit the junction of the first sealing surface 51 and the protection surface 53;

[0060] A first bladder body 64 is disposed between the slide plate 65 and the protection groove 61 , and the first bladder body 64 is connected to the second bladder body 68 via a pipeline 67 .

[0061] Then, when the driving device 11 pushes the valve stem 4 to slide horizontally and then drives the valve core 5 to move away from the valve seat 2, as the valve core 5 moves further, the second sealing surface 52 begins to contact the inner wall of the protection groove 61. At this time, the protection groove 61 can well protect the second sealing surface 52. In order to further improve the protection effect, the driving device 11 pushes the valve stem 4 to continue to slide horizontally. At this time, the valve core 5 squeezes the spring 66, so that the slide plate 65 slides along the axial direction of the protection groove 61 in the slide groove 63. At this time, the slide plate 65 squeezes the first capsule 64, so that the fluid inside it is transferred to the second capsule 68 through the pipeline 67. As the fluid inside the second capsule 68 increases, it will gradually expand and fit at the junction of the first sealing surface 51 and the protection surface 53. The main function of the second capsule 68 is to fit at the junction of the first sealing surface 51 and the protection surface 53 to provide additional protection for the valve core 5.

[0062] In this embodiment, two symmetrically arranged connectors 54 are embedded in the middle of the valve core 5 for connecting with the valve stem 4 .

[0063] In this way, after one side of the valve core 5 is worn out, the other side can be replaced and continued to be used.

[0064] In this embodiment, a valve stem seat 7 is fixed to the side of the main valve body 1 away from the side valve body 3, a sealing sleeve 8 is embedded in the valve stem seat 7, and the valve stem 4 is connected to the driving device 11 after sliding through the valve stem seat 7, and the valve stem seat 7 and the sealing sleeve 8 are in dynamic sealing cooperation;

[0065] The external thread of the valve stem seat 7 is connected with a threaded seat 10 , and the threaded seat 10 limits the sealing sleeve 8 through a pressure seat 9 .

[0066] In an embodiment of the present invention, a hydraulic system is also provided, which includes a hydraulic control valve, a hydraulic pump, and a hydraulic actuator (such as a hydraulic cylinder and a hydraulic motor). In the hydraulic system, the hydraulic control valve is used to control the hydraulic actuator. The hydraulic control valve includes a valve seat protection cylinder 12, a valve core protection assembly 6 and other sealing structures. These structures not only improve the durability and sealing performance of the hydraulic control valve, but also ensure the stable operation of the hydraulic system under harsh working conditions such as high pressure, high speed, and high frequency.

[0067] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic control valve, characterized in that: include: A main valve body (1) has an L-shaped passage in the middle thereof that passes through the main valve body (1), and a side valve body (3) is fixedly connected to the side of the main valve body (1), so that the fluid in the passage can flow from top to bottom and from left to right; a valve seat (2) embedded in the horizontal portion of the channel; A valve stem (4) which slides horizontally through the main valve body (1); A valve core (5) connected to the end of the valve stem (4); A valve seat protection tube (12) is fixedly sleeved on the outside of the valve stem (4), and when the valve core (5) is away from the valve seat (2), the valve seat protection tube (12) can fit the valve seat (2) and provide protection for the valve seat (2); A valve core protection component (6) is arranged in the side valve body (3), and when the valve seat protection cylinder (12) is in contact with the valve seat (2), the valve core (5) is accommodated in the valve core protection component (6); The valve seat (2) is provided with a trumpet surface (21), a first matching surface (22) and a second matching surface (23) in sequence from left to right inside, and the trumpet surface (21) and the first matching surface (22) are used to fit with the valve seat protection tube (12); The first mating surface (22) and the second mating surface (23) are used to fit with the valve core (5); A second sealing surface (52) is formed in the middle of the outer surface of the valve core (5), first sealing surfaces (51) are formed on both sides of the second sealing surface (52), a protective surface (53) is formed on the side of the first sealing surface (51) away from the second sealing surface (52), the first sealing surface (51) is used to fit with the first matching surface (22), and the second sealing surface (52) is used to fit with the second matching surface (23); The valve core protection assembly (6) comprises a protection groove (61), the notch of the protection groove (61) faces the valve seat (2), and the outside of the protection groove (61) is connected to the side valve body (3) by an annular seat (62); A slide groove (63) is provided in the protection groove (61), a slide plate (65) is provided in the slide groove (63) to slide along the axial direction of the protection groove (61), and a spring (66) is fixed on one side of the slide plate (65) close to the valve seat (2); An annular groove is provided in the inner wall of the protection groove (61), and a second annular capsule (68) is embedded in the annular groove. The second capsule (68) is used to fit the junction of the first sealing surface (51) and the protection surface (53). A first sac (64) is arranged between the slide plate (65) and the protection groove (61), and the first sac (64) is connected to the second sac (68) via a pipeline (67).

2. A hydraulic control valve according to claim 1, characterized in that: The outer surface of the valve seat protection cylinder (12) is formed with a first protection surface (121) and a second protection surface (122) in sequence from left to right. The first protection surface (121) is used to fit with the horn surface (21), and the second protection surface (122) is used to fit with the first matching surface (22).

3. A hydraulic control valve according to claim 1, characterized in that: Two symmetrically arranged connectors (54) are embedded in the middle of the valve core (5) for connecting to the valve stem (4).

4. A hydraulic control valve according to claim 1, characterized in that: A valve stem seat (7) is fixed to the side of the main valve body (1) away from the side valve body (3), a sealing sleeve (8) is embedded in the interior of the valve stem seat (7), and the valve stem (4) is connected to the driving device (11) after sliding through the valve stem seat (7), and the valve stem seat (7) and the sealing sleeve (8) are in dynamic sealing cooperation; the external thread of the valve stem seat (7) is connected to a threaded seat (10), and the threaded seat (10) forms a limit to the sealing sleeve (8) through a pressure seat (9).

5. A hydraulic system, characterized in that: It comprises a hydraulic control valve, which is the hydraulic control valve according to any one of claims 1 to 4.

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