Electric control stop valve assembly for water hydraulic system

Abstract

The electronic control stop valve assembly for the water hydraulic system comprises a stop valve body and a reversing valve located outside the stop valve body, a valve seat and a partition plate are arranged in the valve body, a liquid passing valve element is arranged between the valve seat and a first end cover, and a spring is arranged between the liquid passing valve element and the first end cover. The liquid passing valve element comprises a first valve element body and a second valve element body which are sequentially arranged, the first valve element body is close to the first end cover, a control valve element is arranged between the partition plate and the second end cover and comprises a pressure part and a rod part, the pressure part is perpendicular to the extending direction of the valve body, and the rod part is the same as the extending direction of the valve body. The pressure part is close to the second end cover relative to the rod part, the rod part extends towards the liquid passing valve element and penetrates through the partition plate, and the diameter of the pressure part is larger than that of the first valve element body. According to the embodiment, reliable opening or closing can be achieved under different working conditions such as the high-pressure working condition, the low-pressure working condition and the too small pressure difference between the inlet and the working opening, and the application range is widened.

Description

Technical Field

[0001] This disclosure relates to the technical field of shut-off valves, and more specifically, to an electrically controlled shut-off valve assembly for a water hydraulic system. Background Technology

[0002] Electrically controlled shut-off valves are typically designed for direct motor drive. While this method is simple and low-cost, it is unsuitable for certain applications, such as underground coal mines and some chemical industries where high explosion-proof and flameproof requirements are necessary. Furthermore, because this type of valve requires significant driving force to operate the valve core, it is generally only suitable for low-pressure hydraulic systems.

[0003] Existing gate valves typically do not consider the characteristics of low-viscosity hydraulic systems using water or emulsions. Due to the low viscosity of water, water can enter the gap between the control valve core and the valve body or sleeve, preventing the widespread adoption of this structure in water-hydraulic systems, especially in applications requiring both high and low pressure. Furthermore, because the pressure of the working medium at port A directly affects the control valve core, existing gate valves are generally only suitable for scenarios with a large pressure difference between port P and port A (or port A being directly connected to the atmosphere). This is because the control fluid in the upper chamber of the control valve core comes from port P, and the control fluid in the lower chamber comes from port A. If the pressure difference is too small, the downward force of the control valve core cannot overcome the hydraulic pressure and spring force acting on the fluid-carrying valve core. Summary of the Invention

[0004] The purpose of this disclosure is to provide an electrically controlled shut-off valve assembly for a water hydraulic system to solve the aforementioned problems in the prior art.

[0005] To address the aforementioned technical problems, this disclosure provides an electrically controlled shut-off valve assembly for a hydraulic system, comprising a shut-off valve body and a directional valve located outside the shut-off valve body. The shut-off valve body and the directional valve are connected by a pipeline. The shut-off valve body is a hollow structure with openings at both ends. A first end cap and a second end cap are respectively provided at the first and second ends of the shut-off valve body. A valve seat and a partition are provided inside the valve body. A liquid-passing valve core is provided between the valve seat and the first end cap. A spring is provided between the liquid-passing valve core and the first end cap. The liquid-passing valve core includes a first valve... The valve core and the second valve core are provided. The first valve core is disposed near the first end cap. A control valve core is disposed between the partition and the second end cap. The control valve core includes a pressure part and a rod part. The pressure part is perpendicular to the extension direction of the valve body, and the rod part is in the same extension direction as the valve body. The pressure part is disposed near the second end cap relative to the rod part. The rod part extends toward the liquid-passing valve core and passes through the partition. The third diameter of the pressure part is greater than the first diameter of the first valve core. The first diameter of the first valve core is greater than or equal to the second diameter of the second valve core.

[0006] In some embodiments, a valve sleeve is provided on the inner side of the first end of the valve body, the liquid-passing valve core is provided on the inner side of the valve sleeve, an inlet chamber is formed between the valve seat and the valve sleeve, a liquid-passing chamber is provided between the liquid-passing valve core and the first end cap, a working chamber is formed between the valve seat and the partition, and a control chamber is formed between the partition and the second end cap.

[0007] In some embodiments, the rod passes through the partition to enter the working chamber, and a rod cavity is formed between the pressure section and the partition.

[0008] In some embodiments, the first valve core is provided with a first groove and a second groove that communicate with each other, wherein the first groove is located on the outside of the second groove and opens toward the first end cap, the diameter of the first groove is larger than the diameter of the second groove, and the spring is disposed in the first groove.

[0009] In some embodiments, a valve inlet is provided on the first side of the valve body of the shut-off valve, and a first inlet and a second inlet are respectively provided on the first side of the valve body and on both sides of the valve inlet. The valve inlet is connected to the liquid inlet chamber, the first inlet is connected to the liquid outlet chamber and connected to the valve inlet through an external pipeline, the valve inlet is connected to the second inlet through the reversing valve, and the second inlet is also connected to the control chamber.

[0010] In some embodiments, a working port is provided on the second side of the valve body of the shut-off valve, and a first outlet and a second outlet are respectively provided on the second side of the valve body and on both sides of the working port. The working port is in communication with the working chamber. One end of the first outlet is in communication with the rod chamber and the other end is in communication with the atmosphere. One end of the second outlet passes through the valve sleeve and extends to the liquid-passing valve core, and the other end is in communication with the atmosphere.

[0011] In some embodiments, a first seal is provided between the pressure section and the inner wall of the valve body, and a second seal is provided between the through hole of the partition and the rod section.

[0012] In some embodiments, a third seal and a fourth seal are provided between the valve sleeve and the inner wall of the valve body, the third seal and the fourth seal being located on both sides of the second outlet.

[0013] In some embodiments, at least one seal is provided between the liquid-passing valve core and the valve sleeve.

[0014] In some embodiments, the fourth diameter of the rod is smaller than the second diameter of the second valve core.

[0015] This disclosure discloses embodiments that, by designing different valve core diameters, enable the shut-off valve assembly to meet the usage requirements of water-based hydraulic systems. It can reliably open or shut off under different operating conditions, such as high pressure, low pressure, and small pressure difference between the inlet and the working port, thus broadening the application range. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the shut-off valve assembly provided in an embodiment of this disclosure;

[0018] Figure 2 This is a schematic diagram of the structure of the liquid-passing valve core and the control valve core in the shut-off valve assembly provided in the embodiments of this disclosure;

[0019] Figure 3 A schematic diagram of the forces acting on the liquid-passing valve core and the control valve core in the shut-off valve assembly provided in this embodiment. Figure 1 ;

[0020] Figure 4A schematic diagram of the forces acting on the liquid-passing valve core and the control valve core in the shut-off valve assembly provided in this embodiment. Figure 2 ;

[0021] Figure 5 A schematic diagram of the forces acting on the liquid-passing valve core and the control valve core in the shut-off valve assembly provided in this embodiment. Figure 3 ;

[0022] Figure 6 This is a schematic diagram of the installation of the seal in a shut-off valve assembly provided in another embodiment of this disclosure.

[0023] Figure label:

[0024] 1-Stop valve body; 11-First end cap; 12-Second end cap; 2-Liquid flow valve core; 21-First valve core body; 22-Second valve core body; 3-Control valve core; 31-Pressure section; 32-Rod section; 4-Spring; 5-Valve seat; 6-Baffle; 7-Valve sleeve; 41-First seal; 42-Second seal; 43-Third seal; 44-Fourth seal; 45-Fifth seal; 46-Sixth seal; 10-Directional control valve. Detailed Implementation

[0025] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0026] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0027] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0028] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0029] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0030] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0031] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0032] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0033] This disclosure provides an electrically controlled shut-off valve assembly for a water hydraulic system, such as... Figures 1-6 As shown, it includes a shut-off valve body 1 and a directional valve 10 located outside the shut-off valve body 1. The shut-off valve body 1 and the directional valve 10 are connected by a pipeline to achieve mutual flow of fluid.

[0034] Specifically, the valve body 1 of the shut-off valve is a hollow structure with openings at both ends. The first end and the second end of the valve body 1 are respectively provided with a first end cap 11 and a second end cap 12. The valve body 1 of the shut-off valve, the first end cap 11 and the second end cap 12 together form a space.

[0035] Furthermore, a valve sleeve 7 is provided on the inner side of the first end of the valve body 1, and a valve seat 5 and a partition 6 are provided inside the valve body 1. The valve seat 5 is located near the first end cover 11 of the valve body 1, and the partition 6 is located near the second end cover 12 of the valve body 1.

[0036] A liquid-passing valve core 2 is provided between the valve seat 5 and the first end cap 11. The liquid-passing valve core 2 is located inside the valve sleeve 7. A spring 4 is provided between the liquid-passing valve core 2 and the first end cap 11. A control valve core 3 is provided between the partition plate 6 and the second end cap 12. A liquid inlet chamber is formed between the valve seat 5 and the valve sleeve 7. A liquid-passing chamber is provided between the liquid-passing valve core 2 and the first end cap 11. A working chamber is formed between the valve seat 5 and the partition plate 6. A control chamber is formed between the partition plate 6 and the second end cap 12.

[0037] In this embodiment, the liquid-passing valve core 2 and the control valve core 3 are arranged sequentially and have different structures. The liquid-passing valve core 2 includes a first valve core body 21 and a second valve core body 22 arranged sequentially. The diameter of the first valve core body 21 is greater than or equal to the diameter of the second valve core body 22. The first valve core body 21 is provided with a first groove and a second groove that are interconnected. The first groove is located on the outside of the second groove and opens towards the first end cap 11. The diameter of the first groove is greater than the diameter of the second groove. The spring 4 is disposed in the first groove.

[0038] Furthermore, the control valve core 3 has a T-shaped structure, which includes a pressure part 31 and a rod part 32. Here, the pressure part 31 is perpendicular to the extension direction of the valve body 1, and the rod part 32 is in the same extension direction as the valve body 1. The pressure part 31 is disposed near the second end cover 12 relative to the rod part 32. The rod part 32 extends toward the liquid-passing valve core 2 and passes through the partition 6 to enter the working chamber. Here, a rod cavity is formed between the pressure part 31 and the partition 6.

[0039] Furthermore, a valve inlet P is provided on the first side of the valve body 1 of the shut-off valve. A first inlet P1 and a second inlet P2 are respectively provided on the first side of the valve body 1 and on both sides of the valve inlet P. The valve inlet P is connected to the liquid inlet chamber. The first inlet P1 is connected to the liquid outlet chamber and connected to the valve inlet P through an external pipeline. The valve inlet P is connected to the second inlet P2 through the reversing valve 10. The second inlet P2 is also connected to the control chamber.

[0040] Furthermore, a working port A is provided on the second side of the valve body 1 of the shut-off valve. A first outlet T1 and a second outlet T2 are respectively provided on the second side of the valve body 1 and on both sides of the working port A. The working port A is connected to the working chamber. One end of the first outlet T1 is connected to the rod chamber and the other end is connected to the atmosphere. One end of the second outlet T2 passes through the valve sleeve 7 and extends to the liquid-passing valve core 2, and the other end is connected to the atmosphere.

[0041] Furthermore, a first sealing element 41 is provided between the pressure part 31 and the inner wall of the valve body 1, a second sealing element 42 is provided between the through hole 61 of the partition 6 and the rod part 32, a third sealing element 43 and a fourth sealing element 44 are provided between the valve sleeve 7 and the inner wall of the valve body 1, wherein the third sealing element 43 and the fourth sealing element 44 are respectively located on both sides of the second outlet T2, a fifth sealing element 45 is provided between the second valve core 22 and the valve sleeve 7, and a sixth sealing element 46 is provided between the first valve core 21 and the valve sleeve 7. All of the above sealing elements can adopt the structure of a sealing ring.

[0042] In this embodiment, the first diameter of the first valve core body 21 in the liquid-passing valve core 2 is... 1. The second diameter of the second valve core 22 is 2. The third diameter of the pressure section 32 in the control valve core 3 is... 3. The fourth diameter of the rod 31 is 4, of which the third diameter 3> First diameter 1> Second diameter 2. In addition, the fourth diameter 4. Minimize the size while ensuring smooth fluid flow. Furthermore, considering that both the flow valve core 2 and the control valve core 3 will generate friction with the seals during movement, this friction is negligible in high-pressure environments. However, in low-pressure environments, to ensure reliable opening of the flow valve core 2, the diameter of the pressure section 31 of the control valve core 3 can be set as large as possible.

[0043] In another embodiment, when there is a large pressure difference between the valve inlet P and the working port A, or when the working port A is directly connected to the atmosphere (e.g., when adding water to the liquid tank), since the pressure at the working port A is very small, no force to the left as shown in the figure will be generated during the closing process of the liquid-passing valve core 2, so that the liquid-passing valve core 2 can be reliably closed. For this purpose, the first diameter of the first valve core body can be made equal to the second diameter of the second valve core body, so that only the fifth sealing element 45 needs to be provided on the liquid-passing valve core 2.

[0044] In the initial state of the shut-off valve assembly, the liquid-passing valve core 2 is pressed against the valve seat 5 to the left under the spring force of the spring 4. At this time, the liquid-passing valve core 2 cuts off the working fluid, preventing the working fluid from entering the working chamber from the inlet chamber. However, when the working fluid enters the valve body 1 from the valve inlet P, since the valve inlet P and the first inlet P1 are connected, the working fluid enters the liquid-passing chamber from the first inlet P1. The end of the first valve core body 21 facing the first end cap 11 is subjected to pressure, and the force on the liquid-passing valve core 2 is as follows: Figure 3 As shown ( Figure 3 (Spring force not indicated in the text)

[0045] in,

[0046] ;

[0047] In the above formula, p is the pressure at the valve inlet P. Among them, only the liquid-passing valve core 2 is subject to a first acting force F1 to the left in the figure. The liquid-passing valve core 2 is pressed against the valve seat 5 under the action of the first acting force F1 and the spring force of the spring 4 (to the left in the figure) so that the liquid-passing valve core 2 is closed.

[0048] After sending a control signal to the external reversing valve 10 to control the reversing valve to perform a reversing operation, the working fluid at the valve inlet P passes through the reversing valve 10 and enters the control cavity through the second inlet P2, that is, the cavity between the control valve core 3 and the second end cover 12. At this time, due to the existence of the first seal 41, the working fluid will not enter the rod cavity through the gap between the control valve core 3 and the inner wall of the stop valve body 1, enabling the reliable use of the valve inlet P and the working port A even under a small pressure difference, thus expanding the application scenarios and scope. Specifically, only the end face of the pressure part 31 facing the second end cover 12 is subject to pressure, and the control valve core 3 is pushed to the right in the figure by the pressure of the working fluid. Among them, when the rod part 32 of the control valve core 3 just touches the end face of the second valve core body 32, the force on the liquid-passing valve core 2 is as Figure 4 shown ( Figure 4 the spring force is not shown in the figure):

[0049] Among them,

[0050] ;

[0051] Since the third diameter 3 of the pressure part 31 > the first diameter Figure 5 shown ( Figure 5 the spring force is not shown in the figure):

[0052] ;

[0053] ;

[0054] In the above formula, p1 is the pressure at the working port.

[0055] Since there is a resistance loss when the working fluid passes through the liquid-passing valve core 2, at this time p1 < P2, then the magnitude of the resultant force on the liquid-passing valve core 2 is:

[0056] ;

[0057] Because the liquid-passing valve core 2 and the control valve core 3 have different structures and diameters, F2>F1 and F3>F4. Therefore, the liquid-passing valve core 2 continues to open under the combined force until the control valve core 3 or the liquid-passing valve core 2 reaches and remains in the limit position. The liquid-passing valve core 2 remains open throughout. It should be noted that the presence of the second seal 42 prevents the medium at the working port A from entering the control chamber, thus closing the liquid-passing valve core 2.

[0058] Furthermore, when the reversing valve 10 is closed, the control fluid in the control chamber of the control valve core 3 returns to the external liquid tank through the reversing valve 10, and the control valve core 3 is reset under the action of the third force F3; the liquid-passing valve core 2 is only subjected to the first force F1 and the third force F3. Due to the presence of the third seal 43 and the fourth seal 24, the working fluid at the working port A acts on the end face of the second valve core body 22 facing the control valve core 3, and the working fluid in the liquid-passing chamber acts on the end face of the first valve core body 21 facing the first end cap 11. Due to the area difference and pressure difference, the liquid-passing valve core 2 moves to the left in the figure to press against the valve seat 5 and remain there, thereby achieving reliable closure.

[0059] This embodiment of the disclosure, by providing an outlet, allows the dead space between the valve sleeve and valve core, created by the added seal, to be connected to the atmosphere, enabling the shut-off valve assembly to reliably switch on and off even at lower operating pressures. Specifically, the first outlet T1 addresses the issue of a certain amount of sealing gas present in the rod chamber of the control valve core 3. When the control valve core 3 moves to the right in the figure, it compresses this sealing gas, increasing the gas pressure and generating a force towards the liquid-passing valve core 2. Since one atmosphere is 0.1 MPa, the compressed gas pressure significantly increases, making it impossible for the shut-off valve assembly to operate under low-pressure conditions (such as adding water to a liquid tank via a head pump in a coal mine). By connecting the first outlet T1 to the atmosphere, the shut-off valve assembly can be reliably used at lower pressures.

[0060] The second outlet T2 has a similar function to the first outlet T1. That is, the liquid-passing valve core 2 will also compress gas during the movement, affecting the performance of the shut-off valve assembly at lower pressures.

[0061] This disclosed embodiment can be applied to hydraulic systems, specifically hydraulic systems in fully mechanized mining faces in underground coal mines, and is particularly suitable for low-pressure environments. It is noteworthy that fully mechanized mining face hydraulic systems commonly use emulsions (95% water and 5% emulsified oil) as the transmission medium, which is similar to water. Furthermore, underground electrical equipment requires intrinsically safe design or explosion-proof treatment, and conventional equipment cannot be used underground. This disclosed embodiment, in conjunction with an intrinsically safe electromagnetic pilot valve, can be widely used in underground coal mine operations.

[0062] This disclosure discloses embodiments that, by designing different valve core diameters, enable the shut-off valve assembly to meet the usage requirements of water-based hydraulic systems. It can reliably open or shut off under different operating conditions, such as high pressure, low pressure, and small pressure difference between the inlet and the working port, thus broadening the application range.

[0063] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0064] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electrically controlled shut-off valve assembly for a water hydraulic system, characterized by The application relates to a valve body of a stop valve and a reversing valve, which are connected through pipelines, the stop valve body is a hollow structure with two open ends, a first end cover and a second end cover are arranged at the first end and the second end of the stop valve body respectively, a valve seat and a partition plate are arranged in the valve body, a liquid passing valve core is arranged between the valve seat and the first end cover, a spring is arranged between the liquid passing valve core and the first end cover, the liquid passing valve core comprises a first valve core body and a second valve core body arranged in sequence, the first valve core body is arranged close to the first end cover, a control valve core is arranged between the partition plate and the second end cover, the control valve core comprises a pressure part and a rod part, the pressure part is perpendicular to the extension direction of the valve body, the rod part is the same as the extension direction of the valve body, the pressure part is arranged close to the second end cover relative to the rod part, the rod part extends towards the liquid passing valve core and penetrates through the partition plate, the third diameter of the pressure part is larger than the first diameter of the first valve core body, and the first diameter of the first valve core body is larger than or equal to the second diameter of the second valve core body.

2. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 1, wherein, The inner side of the first end of the valve body is provided with a valve sleeve, the liquid passing valve core is arranged in the inner side of the valve sleeve, a liquid inlet cavity is formed between the valve seat and the valve sleeve, a liquid passing cavity is formed between the liquid passing valve core and the first end cover, a working cavity is formed between the valve seat and the partition plate, and a control cavity is formed between the partition plate and the second end cover.

3. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 2, wherein, The rod part penetrates through the partition plate to enter the working cavity, and a rod cavity is formed between the pressure part and the partition plate.

4. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 3, wherein, The first valve core body is provided with a first groove and a second groove which are in communication with each other, the first groove is located on the outer side of the second groove and opens towards the first end cover, the diameter of the first groove is larger than that of the second groove, and the spring is arranged in the first groove.

5. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 3, wherein, A valve inlet is arranged on the first side of the stop valve body, a first inlet and a second inlet are arranged on the first side of the stop valve body and located on the two sides of the valve inlet respectively, the valve inlet is in communication with the liquid inlet cavity, the first inlet is in communication with the liquid passing cavity and is in communication with the valve inlet through an external pipeline, the valve inlet is in communication with the second inlet through the reversing valve, and the second inlet is also in communication with the control cavity.

6. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 5, wherein, A working port is arranged on the second side of the stop valve body, a first outlet and a second outlet are arranged on the second side of the stop valve body and located on the two sides of the working port respectively, the working port is in communication with the working cavity, one end of the first outlet is in communication with the rod cavity, and the other end of the first outlet is in communication with the atmosphere; one end of the second outlet penetrates through the valve sleeve and extends to the liquid passing valve core, and the other end of the second outlet is in communication with the atmosphere.

7. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 6, wherein, A first sealing member is arranged between the pressure part and the inner wall of the valve body, and a second sealing member is arranged between the through hole of the partition plate and the rod part.

8. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 7, wherein, A third sealing member and a fourth sealing member are arranged between the valve sleeve and the inner wall of the valve body, and the third sealing member and the fourth sealing member are located on the two sides of the second outlet respectively.

9. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 8, wherein, At least one sealing member is arranged between the liquid passing valve core and the valve sleeve.

10. The electrically controlled shut-off valve assembly for a water hydraulic system of claim 1, wherein, The fourth diameter of the stem portion is less than the second diameter of the second valve core body.

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