Intrinsic safety type electric control stop valve

Abstract

The intrinsic safety type electric control stop valve comprises a hydraulic control one-way valve, a first pilot valve and a second pilot valve, the hydraulic control one-way valve is provided with a main liquid inlet, a main liquid outlet and a control cavity, the first pilot valve is provided with a first liquid inlet and a first working opening, and the second pilot valve is provided with a second liquid inlet and a second working opening. The first liquid inlet and the main liquid inlet are respectively communicated with the liquid inlet end, the first working port is connected with the second liquid inlet through a first branch, and the control cavity is communicated with the first branch. According to the intrinsic safety type electric control stop valve, regulation and control over the hydraulic control one-way valve are achieved through the first pilot valve and the second pilot valve, and the stop function, the pressure locking function, the one-way conduction function and the conduction keeping function of the stop valve are achieved; only the intrinsic safety power supply requirements of the first pilot valve and the second pilot valve need to be met, power consumption is lower, and power supply is easier to achieve.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valves, and in particular to an intrinsically safe electrically controlled stop valve. Background Art

[0002] A globe valve is a type of switching device with a wide range of applications. For example, in mine hydraulic systems, the water supply in a water tank needs to be cut off when the water level reaches a certain level, which requires a globe valve to accomplish. With the development of automation and intelligent construction, globe valves are developing towards intelligent control and remote control.

[0003] The current stop valve is driven by an electromagnet. In order to overcome the large resistance and realize the function of cutting off the liquid supply, the drive current of the stop valve is usually designed to be large, resulting in poor intrinsic safety performance. Summary of the Invention

[0004] In view of this, the present invention aims to provide an intrinsically safe electrically controlled stop valve to solve the technical problem of poor intrinsic safety performance of stop valves in the prior art.

[0005] The present invention provides an intrinsically safe electrically controlled stop valve, comprising a hydraulically controlled one-way valve, a first pilot valve, and a second pilot valve, wherein the hydraulically controlled one-way valve is provided with a total liquid inlet, a total liquid outlet, and a control chamber, the first pilot valve is provided with a first liquid inlet and a first working port, the second pilot valve is provided with a second liquid inlet and a second working port, the first liquid inlet and the total liquid inlet are respectively connected to the liquid inlet end, the first working port and the second liquid inlet are connected via a first branch, and the control chamber is connected to the first branch; when the first pilot valve is in a first state, the liquid path between the control chamber and the first pilot valve is cut off; when the first pilot valve is in a second state, the liquid path from the first pilot valve to the control chamber is opened; when the second pilot valve is in a third state, the liquid path from the second liquid inlet to the second working port is cut off; when the second pilot valve is in a fourth state, the liquid path from the second liquid inlet to the second working port is opened.

[0006] Furthermore, it also includes a first one-way valve, which is arranged in the first branch to enable one-way conduction from the first pilot valve to the control chamber.

[0007] Furthermore, it also includes a liquid tank, which is connected to the second working port; and a second one-way valve, which is connected between the liquid tank and the second working port to enable one-way conduction from the second pilot valve to the liquid tank.

[0008] Furthermore, a filter is included. The first liquid inlet is connected to the liquid inlet end through a second branch, and the filter is arranged on the second branch.

[0009] Further, when the first pilot valve is in a de-energized state, it is in a first state; when the first pilot valve is in an energized state, it is in a second state; when the second pilot valve is in a de-energized state, it is in a third state; and when the second pilot valve is in an energized state, it is in a fourth state.

[0010] Further, the first pilot valve is an intrinsically safe electromagnetic pilot valve, and the second pilot valve is an intrinsically safe electromagnetic pilot valve.

[0011] Further, the hydraulic check valve includes a valve sleeve, a valve core, and a reset member. The valve sleeve is provided with a valve cavity, a first inlet, a first outlet, and a sealing portion. The valve core is provided with an acting portion. The valve core is slidably disposed in the valve cavity. The reset member is used to drive the valve core to slide so that the valve core is in sealed contact with the sealing portion. The first inlet is correspondingly disposed with the acting portion, and one end of the valve core is correspondingly disposed with the control cavity.

[0012] Further, the acting portion includes a groove structure. The groove structure has a first acting surface and a second acting surface on one side along the opening direction of the valve core and one side along the closing direction of the valve core, respectively. The pressure-bearing area of the first acting surface is larger than that of the second acting surface.

[0013] Further, one end of the valve core along the closing direction is provided with a first conical surface portion for conical sealed contact with the sealing portion of the valve sleeve.

[0014] Further, the valve sleeve includes a first valve sleeve, a valve body, and a plug. The valve body is provided with an installation cavity. The first valve sleeve is located in the installation cavity. The plug is connected to the valve body to limit the first valve sleeve. The plug is provided with the control cavity.

[0015] In the intrinsically safe electric control check valve of the present invention, the control of the hydraulic control check valve is realized through the first pilot valve and the second pilot valve. When the first pilot valve is in the second state and the second pilot valve is in the third state, the high-pressure liquid at the liquid inlet end can enter the control cavity through the first pilot valve, causing the hydraulic control check valve to close and realizing the cut-off function of the intrinsically safe electric control check valve. After the cut-off function is realized, when the first pilot valve is switched to the first state (at this time, the second pilot valve remains in the third state), the liquid path between the first pilot valve and the control cavity is cut off, and the liquid path from the control cavity to the second pilot valve is cut off, so that the pressure in the control cavity remains at a relatively high value unchanged, and the hydraulic control check valve is locked by the relatively high pressure and remains in the closed state, realizing the pressure locking function of the intrinsically safe electric control check valve. When the second pilot valve is in the fourth state (the first pilot valve can be in any state), the control cavity can be depressurized through the second pilot valve, and the hydraulic control check valve is no longer pressure-locked by the control cavity, thereby realizing the one-way conduction function of the intrinsically safe electric control check valve. After the one-way conduction function is realized, when the first pilot valve is switched to the first state (or remains in the first state) and the second pilot valve is switched to the third state, the hydraulic control check valve remains open, realizing the holding conduction function of the intrinsically safe electric control check valve. The intrinsically safe electric control check valve of the present invention only needs to meet the power supply of the first pilot valve and the second pilot valve, which is conducive to using intrinsically safe current and intrinsically safe voltage to drive for remote control and has better intrinsic safety performance.

[0016] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. Identical reference numerals with alphabetic suffixes or different alphabetic suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used in conjunction with the specification and the claims to explain the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be an exhaustive or exclusive embodiment of the apparatus or method. The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is the schematic diagram of the intrinsically safe electric control check valve in the embodiment of the present invention;

[0019] Figure 2 is the structural schematic diagram of the intrinsically safe electric control check valve in the embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the pilot-operated check valve in the embodiment of the present invention.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 1. First pilot valve; 11. First liquid inlet; 12. First working port; 13. First liquid return port; 14. First manual switch; 2. Second pilot valve; 21. Second liquid inlet; 22. Second working port; 23. Second liquid return port; 24. Second manual switch; 3. First check valve; 4. Pilot-operated check valve; 401. Valve sleeve; 4011. Valve cavity; 4012. First inlet; 4013. First outlet; 4014. Sealing part; 402. Spool; 4021. Acting part; 40211. First acting surface; 40212. Second acting surface; 4022. First conical surface part; 403. Reset part; 404. Valve body; 4041. Installation cavity; 405. Plug cover; 406. First interface part; 407. Second interface part; 41. Total liquid inlet; 42. Total liquid outlet; 43. Control cavity; 5. Second check valve; 6. Liquid tank; 7. Filter; 8. Liquid distribution plate; 10. First branch; 20. Second branch. Specific embodiments

[0023] Next, specific embodiments of the present invention will be described in detail with reference to the drawings, but it is not a limitation of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", which may all refer to one or more of the same or different embodiments according to the present invention.

[0026] The present invention provides an intrinsically safe electric control shut-off valve, which includes a pilot-operated check valve 4, a first pilot valve 1, and a second pilot valve 2. The pilot-operated check valve 4 is provided with a total liquid inlet 41, a total liquid outlet 42, and a control chamber 43. The first pilot valve 1 is provided with a first liquid inlet 11 and a first working port 12. The second pilot valve 2 is provided with a second liquid inlet 21 and a second working port 22. The first liquid inlet 11 and the total liquid inlet 41 are respectively communicated with the liquid inlet end. A first branch 10 is connected between the first working port 12 and the second liquid inlet 21, and the control chamber 43 is communicated with the first branch 10. When the first pilot valve 1 is in the first state, the liquid path between the control chamber 43 and the first pilot valve 1 is cut off; when the first pilot valve 1 is in the second state, the liquid path from the first pilot valve 1 to the control chamber 43 is conducted; when the second pilot valve 2 is in the third state, the liquid path from the second liquid inlet 21 to the second working port 22 is cut off; when the second pilot valve 2 is in the fourth state, the liquid path from the second liquid inlet 21 to the second working port 22 is conducted.

[0027] Exemplarily, in combination with Figure 1 the schematic diagram of the intrinsically safe electric control shut-off valve shown, both the first pilot valve 1 and the second pilot valve 2 can adopt two-position three-way electromagnetic pilot valves. In practical applications, different multi-position multi-way pilot valves can also be selected according to needs, as long as the following conditions are met: The first pilot valve 1 has at least a first liquid inlet 11 and a first working port 12, and at least a first state and a second state (that is, the first pilot valve 1 is at least two-position two-way); the second pilot valve 2 has at least a third state and a fourth state, and at least a second liquid inlet 21 and a second working port 22 (that is, the second pilot valve 2 is at least two-position two-way).

[0028] In combination with Figure 2 shown, an exemplary structure of an intrinsically safe electric control shut-off valve is demonstrated. Components such as the first pilot valve 1, the second pilot valve 2, the first check valve 3, the pilot-operated check valve 4, the second check valve 5, the filter 7, and the liquid distribution plate 8 (the first check valve 3 and the second check valve 5 are connected to the liquid distribution plate 8, and then the first pilot valve 1, the second pilot valve 2, the liquid distribution plate 8, and the pilot-operated check valve 4 are connected together) are integrated, and the overall structure is more compact.

[0029] In combination with Figure 3 shown, an exemplary pilot-operated check valve 4 is demonstrated. The opening and closing of the pilot-operated check valve 4 can be controlled by the pressure change in the control chamber 43.

[0030] Taking Figure 1Taking the intrinsically safe electric control stop valve shown as an example, the first pilot valve 1 is a two-position three-way valve, and it is also provided with a first liquid return port 13. The second pilot valve 2 is a two-position three-way valve, and it is also provided with a second liquid return port 23. Preferably, it further includes a first check valve 3, and the first check valve 3 is arranged on the first branch 10 to make the first pilot valve 1 conduct unidirectionally to the control chamber 43. The high-pressure liquid at the P end (i.e., the liquid inlet end) is divided into two branches and enters the total liquid inlet 41 of the pilot-operated check valve 4 and the first liquid inlet 11 of the first pilot valve 1 respectively. The following exemplarily describes the operation process of this intrinsically safe electric control stop valve:

[0031] When the first pilot valve 1 is in the second state and the second pilot valve 2 is in the third state, the first liquid inlet 11 is communicated with the first working port 12 (i.e., the liquid path from the first pilot valve 1 to the control chamber 43 is conducted). The high-pressure liquid passes through the first liquid inlet 11, the first working port 12, and the first branch 10, and finally enters the control chamber 43, making the pressure in the control chamber 43 rise. The pilot-operated check valve 4 is affected by the pressure in the control chamber 43 and is in a closed state, that is, the intrinsically safe electric control stop valve is in a cut-off state at this time, making the liquid path between the P end and the A end (the total liquid inlet 41 and the total liquid outlet 42) cut off;

[0032] After that, when the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, the first liquid inlet 11 is cut off, the first working port 12 is communicated with the first liquid return port 13, and the first check valve 3 makes the first pilot valve 1 conduct unidirectionally to the control chamber 43 (i.e., the liquid path between the first pilot valve 1 and the control chamber 43 is cut off). The second liquid inlet 21 of the second pilot valve 2 is cut off (i.e., the liquid path from the control chamber 43 to the second pilot valve 2 is cut off), the second working port 22 is communicated with the second liquid return port 23, and the pressure in the control chamber 43 remains at a relatively high value, equivalent to the pilot-operated check valve 4 being in a closed state and locked by pressure. The intrinsically safe electric control stop valve is in a pressure locking state at this time;

[0033] After that, when the first pilot valve 1 is in the first state and the second pilot valve 2 is in the fourth state, the second liquid inlet 21 is communicated with the second working port 22 (i.e., the liquid path from the second liquid inlet 21 to the second working port 22 is conducted). The high-pressure liquid in the control chamber 43 is discharged through the second liquid inlet 21 and the second working port 22 to realize pressure relief. The pilot-operated check valve 4 is unlocked and is in a unidirectional conduction state (usually, when the first pilot valve 1 is in the second state and the second pilot valve 2 is in the fourth state, it is equivalent to pressurizing and relieving pressure at the same time. At this time, the pressure relief of the control chamber 43 can actually be realized). The high-pressure liquid at the P end (i.e., the liquid inlet end) can flow to the A end (i.e., the liquid outlet end) through the pilot-operated check valve 4, and the stop valve is in a unidirectional conduction state at this time;

[0034] After that, keep the first pilot valve 1 in the first state, switch the second pilot valve 2 to the third state. The first liquid inlet 11 is cut off, and the second liquid inlet 21 of the second pilot valve 2 is cut off. At this time, due to the cut-off of the first check valve 3 and the second liquid inlet 21 (that is, the liquid path between the first pilot valve 1 and the control chamber 43 is cut off, and the liquid path from the control chamber 43 to the second pilot valve 2 is cut off), the pressure in the control chamber 43 is maintained at a lower pressure value after pressure relief, which is equivalent to the pilot-operated check valve 4 being in an open state and locked. The stop valve is in a conducting state at this time.

[0035] It can be understood that by blocking the first liquid return port 13 to replace the first check valve 3 (that is, blocking the first liquid return port 13, or the intrinsically safe electric control stop valve further includes the first check valve 3, and the first check valve 3 is arranged in the first branch 10 to make the one-way conduction from the first pilot valve 1 to the control chamber 43), the function of cutting off between the first pilot valve 1 and the control chamber 43 can also be realized. For example, the first liquid return port 13 is blocked by a sealing structure, which is not specifically limited here.

[0036] In another embodiment, the first pilot valve 1 is a two-position two-way valve (that is, it has a first liquid inlet 11 and a first working port 12), and the second pilot valve 2 is a two-position two-way valve (that is, it has a second liquid inlet 21 and a second working port 22). When the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, the first liquid inlet 11 and the first working port 12 are cut off (that is, the cut-off between the first pilot valve 1 and the control chamber 43), and the second liquid inlet 21 and the second working port 22 are cut off (that is, the cut-off from the control chamber 43 to the second pilot valve 2), so that the control chamber 43 is maintained at a certain pressure; when the first pilot valve 1 is in the second state and the second pilot valve 2 is in the third state, the first liquid inlet 11 and the first working port 12 are communicated (that is, the conduction from the first pilot valve 1 to the control chamber 43), so that the high-pressure liquid enters the control chamber 43 through the first liquid inlet 11, the first working port 12, and the first branch 10 to realize the pressurization of the control chamber 43; when the second pilot valve 2 is in the fourth state (the first pilot valve 1 can be in any state), the second liquid inlet 21 and the second working port 23 are communicated (that is, the conduction from the second liquid inlet 21 to the second working port 23), so that the high-pressure liquid in the control chamber 43 is discharged through the first branch 10, the second liquid inlet 21, and the second working port 23 to realize the pressure relief of the control chamber 43.

[0037] The intrinsically safe electro-control shut-off valve in the present invention realizes the regulation of the hydraulic check valve 4 through the first pilot valve 1 and the second pilot valve 2. When the first pilot valve 1 is in the second state and the second pilot valve 2 is in the third state, the high-pressure liquid at the liquid inlet end can enter the control chamber 43 through the first pilot valve 1, causing the hydraulic check valve 4 to close and realizing the cut-off function of the intrinsically safe electro-control shut-off valve. After the cut-off function is realized, when the first pilot valve 1 is switched to the first state (at this time, the second pilot valve 2 remains in the third state), the liquid path between the first pilot valve 1 and the control chamber 43 is cut off, and the liquid path from the control chamber 43 to the second pilot valve 2 is cut off, so that the pressure in the control chamber 43 remains at a relatively high value unchanged, and the hydraulic check valve 4 is locked by the relatively high pressure and remains in the closed state, realizing the pressure locking function of the intrinsically safe electro-control shut-off valve. When the second pilot valve 2 is in the fourth state (the first pilot valve 1 can be in any state), the control chamber 43 can be depressurized through the second pilot valve 2, and the hydraulic check valve 4 is no longer pressure-locked by the control chamber 43, thereby realizing the one-way conduction function of the intrinsically safe electro-control shut-off valve. After the one-way conduction function is realized, when the first pilot valve 1 is switched to the first state (or remains in the first state) and the second pilot valve 2 is switched to the third state, the hydraulic check valve 4 remains open, realizing the holding conduction function of the intrinsically safe electro-control shut-off valve. The intrinsically safe electro-control shut-off valve of the present invention only needs to meet the power supply of the first pilot valve 1 and the second pilot valve 2, which is conducive to using intrinsically safe current and intrinsically safe voltage to drive for remote control and has better intrinsic safety performance.

[0038] Furthermore, it further includes a liquid tank 6, and the liquid tank 6 is communicated with the second working port 22.

[0039] Combined with Figure 1 As shown, the liquid tank 6 plays a role in pressure relief and oil collection, and the high-pressure liquid discharged from the control chamber 43 can enter the liquid tank 6.

[0040] Preferably, it further includes a second check valve 5, and the second check valve 5 is connected between the liquid tank 6 and the second working port 22 to make the one-way conduction from the second pilot valve 2 to the liquid tank 6.

[0041] Combined with Figure 1 As shown, the second check valve 5 is arranged between the second working port 22 and the liquid tank 6. When the second pilot valve 2 is in the fourth state, the high-pressure liquid in the control chamber 43 is discharged through the second pilot valve 2 and the second check valve 5, which will not affect the pressure relief function; at the same time, it avoids the high-pressure liquid from flowing back into the control chamber 43 and prevents the hydraulic check valve 4 from malfunctioning.

[0042] Preferably, it further includes a filter 7. The first liquid inlet 11 is connected to the liquid inlet end through a second branch 20, and the filter 7 is arranged on the second branch 20.

[0043] Combined with Figure 1As shown, the first liquid inlet 11 is connected to the P end (i.e., the liquid inlet end) through the second branch 20. The filter 7 can be of any model as required. When high-pressure liquid enters the second branch 20 and flows through the filter 7, the filter 7 filters out impurities in the oil liquid, avoiding affecting the operation of other hydraulic system components and ensuring the service life of each component.

[0044] In addition, the first branch 10 and the second branch 20 can be a physical pipeline structure or a virtual cavity structure, and should be designed according to needs, which is not limited here.

[0045] Preferably, when the first pilot valve 1 is in the power-off state, it is in the first state; when the first pilot valve 1 is in the power-on state, it is in the second state; when the second pilot valve 2 is in the power-off state, it is in the third state; when the second pilot valve 2 is in the power-on state, it is in the fourth state.

[0046] Combined with Figure 1 As shown, when the first pilot valve 1 is in the power-on state and the second pilot valve 2 is in the power-off state, the first pilot valve 1 is in the second state and the second pilot valve 2 is in the third state, so that high-pressure liquid enters the control cavity 43 to realize the cut-off function of the intrinsically safe type electrically controlled stop valve; afterwards, when the first pilot valve 1 is in the power-off state and the second pilot valve 2 is in the power-off state, the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, and the pressure in the control cavity 43 remains unchanged to realize the pressure locking function of the intrinsically safe type electrically controlled stop valve; afterwards, when the second pilot valve 2 is in the power-on state, the second pilot valve 2 is in the fourth state, and the control cavity 43 is depressurized to realize the one-way conduction of the intrinsically safe type electrically controlled stop valve; afterwards, when the first pilot valve 1 is in the power-off state and the second pilot valve 2 is in the power-off state, the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, and the pressure in the control cavity 43 remains unchanged to realize the holding conduction function of the intrinsically safe type electrically controlled stop valve.

[0047] In this way, when both the first pilot valve 1 and the second pilot valve 2 of the intrinsically safe type electrically controlled stop valve of the present invention are powered off, the pressure in the control cavity 43 can be kept unchanged, realizing the functions of power-off pressure locking and power-off holding conduction, saving electric energy, and at the same time being beneficial to better intrinsic safety performance.

[0048] Furthermore, the first pilot valve 1 is an intrinsically safe electromagnetic pilot valve, and the second pilot valve 2 is an intrinsically safe electromagnetic pilot valve.

[0049] Using the intrinsically safe electromagnetic pilot valve as the first pilot valve 1 and the second pilot valve 2 makes the current and voltage of the first pilot valve 1 and the second pilot valve 2 meet the requirements of intrinsic safety performance, making the intrinsically safe type electrically controlled stop valve of the present invention more suitable for applications in scenarios such as mines.

[0050] Preferably, combined with Figure 1As shown, the first pilot valve 1 is provided with a first manual switch 14, and the second pilot valve 2 is provided with a second manual switch 24.

[0051] The structures of the first manual switch 14 and the second manual switch 24 can be designed as required, as long as they can manually control the state switching of the first pilot valve 1 and the second pilot valve 2. In this way, in case of accidents such as electric control failure, the intrinsically safe electric control stop valve can be adjusted by manual operation, which is beneficial to the safety of the hydraulic system.

[0052] Further, the hydraulic check valve 4 includes a valve sleeve 401, a valve core 402, and a reset member 403. The valve sleeve 401 is provided with a valve cavity 4011, a first inlet 4012, a first outlet 4013, and a sealing portion 4014. The valve core 402 is provided with an acting portion 4021. The valve core 402 is slidably disposed in the valve cavity 4011. The reset member 403 is used to drive the valve core 402 to slide so that the valve core 402 is in sealing contact with the sealing portion 4014. The first inlet 4012 is correspondingly disposed with the acting portion 4021. One end of the valve core 402 is correspondingly disposed with the control cavity 43.

[0053] Combined Figure 2 and Figure 3 As shown, an example structure of the hydraulic check valve 4 is shown in the figure. Its corresponding valve core sliding directions include an opening direction and a closing direction. The valve sleeve 401 is provided with a valve cavity 4011, a first inlet 4012, and a first outlet 4013, and a sealing portion 4014 is provided inside the valve cavity 4011 of the valve sleeve 401. The sealing portion 4014 can be structures such as a conical surface or a spherical surface, so as to form sealing contact forms such as conical surface sealing and spherical surface sealing with the valve core 402. The valve core 402 is slidably disposed in the valve cavity 4011. Optionally, a sliding seal (such as a sealing ring) can be provided between the valve core 402 and the inner wall of the valve sleeve 401 to balance sealing performance and sliding performance. The reset member 403 can be an elastic member such as a spring, so as to provide power for the valve core 402 to slide in the closing direction, so that the valve core 402 is in sealing contact with the sealing portion 4014. The valve core 402 is provided with an acting portion 4021, and the first inlet 4012 is correspondingly disposed with the acting portion 4021, so that the high-pressure liquid acts on the acting portion 4021 after passing through the first inlet 4012. The acting portion 4021 can be a certain part of the surface of the valve core 402. One end of the valve core 402 (in this embodiment, it is the end of the valve core 402 along the opening direction) is correspondingly disposed with the control cavity 43, so that the high-pressure liquid acts on this end of the valve core 402 after passing through the control cavity 43.

[0054] Thus, when the first pilot valve 1 is in the second state and the second pilot valve 2 is in the third state, the pressure in the control chamber 43 increases, causing the valve core 402 to slide into sealing contact with the sealing portion 4014, achieving the cut-off function; thereafter, when the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, the pressure in the control chamber 43 stabilizes at a relatively high value, causing the valve core 402 to maintain the seal with the sealing portion 4014; thereafter, when the first pilot valve 1 is in the first state and the second pilot valve 2 is in the fourth state, the control chamber 43 is depressurized, and the acting portion 4021 of the valve core 402 is acted upon by the high-pressure liquid, causing the seal between the valve core 402 and the sealing portion 4014 to open; thereafter, when the first pilot valve 1 is in the first state and the second pilot valve 2 is in the third state, the pressure in the control chamber 43 stabilizes at a relatively low value, causing the valve core 402 and the sealing portion 4014 to remain open.

[0055] Further, the acting portion 4021 includes a groove structure, and the groove structure has a first acting surface 40211 and a second acting surface 40212 on one side along the opening direction of the valve core 402 and on one side along the closing direction of the valve core 402, respectively. The pressure-bearing area of the first acting surface 40211 is larger than the pressure-bearing area of the second acting surface 40212.

[0056] Combined Figure 2 and Figure 3 As shown, the valve core 402 is generally cylindrical, and an annular groove is formed on its surface, that is, the groove structure. The groove structure has a first acting surface 40211 on one side along the opening direction, and a second acting surface 40212 on one side along the closing direction. The pressure-bearing areas of the first acting surface 40211 and the second acting surface 40212 are both annular surfaces. The diameter D1 of the valve core 402 corresponding to the first acting surface 40211 is larger than the diameter D2 of the valve core 402 corresponding to the second acting surface 40212, and the bottom surface of the groove structure is parallel to the sliding direction of the valve core 402. Therefore, the pressure-bearing area of the first acting surface 40211 is larger than the pressure-bearing area of the second acting surface 40212. It can be understood that the valve core 402, the groove structure, the first acting surface 40211, and the second acting surface 40212 can also be of other shapes, and the above description of the shape is only one embodiment.

[0057] Thus, the first acting surface 40211 and the second acting surface 40212 with different pressure-bearing areas are formed through the groove structure. When the high-pressure liquid acts on the groove structure, the hydraulic pressure acting on the valve core 402 is directed towards the opening direction, and the valve core 402 slides in the opening direction, thereby making the conduction from the P end to the A end. This structure of opening the valve core through the area difference is relatively compact and is conducive to improving the action response speed.

[0058] Further, one end of the valve core 402 along the closing direction is provided with a first conical surface portion 4022, and the first conical surface portion 4022 is used for conical sealing contact with the conical surface of the sealing portion 4014.

[0059] As shown in Figure 3 Figure, one end of the valve core 402 along the closing direction is provided with a first conical surface portion 4022. The sealing portion 4014 also adopts a conical surface design. The first conical surface portion 4022 and the sealing portion 4014 can achieve conical sealing contact, which is more suitable for sealing in a higher-pressure environment.

[0060] Further, the hydraulic check valve 4 further includes a valve body 404 and a plug 405. The valve body 404 is provided with an installation cavity 4041. The valve sleeve 401 is located in the installation cavity 4041. The plug 405 is connected to the valve body 404 to limit the valve sleeve 401, and the plug 405 is provided with the control cavity 43.

[0061] As shown in Figure 3 Figure, the valve body 404 is provided with an installation cavity 4041. The valve sleeve 401 is installed in the installation cavity 4041. The plug 405 is provided with an external thread, and the inner wall of the installation cavity 4041 is provided with an internal thread for threaded connection with the plug 405. The plug 405 can abut against and limit the valve sleeve 401. The control cavity 43 is opened on the plug 405, so that the control cavity 43 is communicated with the valve cavity 4011. At the same time, the control cavity 43 corresponds to one end of the valve core 402 along the opening direction, so as to facilitate the high-pressure liquid in the control cavity 43 to act on the valve core 402.

[0062] In this way, the installation and limitation of the valve sleeve 401 are realized through the plug 405 and the valve body 404, which is convenient for integration with other components. In addition, for convenient disassembly and assembly, the plug 405 may also be provided with a structure such as a hexagonal groove that is convenient for applying force.

[0063] Further, the hydraulic check valve 4 further includes a first interface member 406 and a second interface member 407. Both the first interface member 406 and the second interface member 407 are connected to the valve body 404. The first interface member 406 is provided with a total liquid inlet 41, and the second interface member 407 is provided with a total liquid outlet 42.

[0064] As shown in Figure 3 Figure, both the first interface member 406 and the second interface member 407 adopt threaded interfaces, and the valve body 404 is provided with corresponding internal thread installation grooves, so as to facilitate the disassembly and assembly of the first interface member 406 and the second interface member 407. After installation, the total liquid inlet 41 is communicated with the first inlet 4012, and the first outlet 4013 is communicated with the total liquid outlet 42.

[0065] In this way, through the first interface member 406 and the second interface member 407, the interface matching between the check valve and other components is facilitated, and the practicability is improved.

[0066] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding interpretations of the spatial relative descriptions used herein will be made accordingly.

[0067] In addition to the above, it should also be noted that when referring to "one embodiment", "another embodiment", "embodiment" etc. in this specification, it means that the specific features, structures or characteristics described in connection with that embodiment are included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intrinsically safe electric control shut-off valve, characterized in that, It includes a hydraulically controlled one-way valve, a first pilot valve, and a second pilot valve. The hydraulically controlled one-way valve is provided with a total liquid inlet, a total liquid outlet, and a control chamber. The first pilot valve is provided with a first liquid inlet and a first working port. The second pilot valve is provided with a second liquid inlet and a second working port. The first liquid inlet and the total liquid inlet are respectively connected to the liquid inlet end. The first working port and the second liquid inlet are connected through a first branch. The control chamber is connected to the first branch.

2. The intrinsically safe type electric control shut-off valve according to claim 1, wherein, When the first pilot valve is in a first state, the fluid path between the control chamber and the first pilot valve is cut off; when the first pilot valve is in a second state, the fluid path from the first pilot valve to the control chamber is opened; when the second pilot valve is in a third state, the fluid path from the second fluid inlet to the second working port is cut off; when the second pilot valve is in a fourth state, the fluid path from the second fluid inlet to the second working port is opened.

3. The intrinsically safe type electric control shut-off valve according to claim 1, wherein, The invention also includes a first one-way valve, which is arranged on the first branch to enable one-way conduction from the first pilot valve to the control chamber.

4. The intrinsically safe type electric control shut-off valve according to claim 1, characterized in that, The invention also includes a liquid tank, which is connected to the second working port; and a second one-way valve, which is connected between the liquid tank and the second working port to enable one-way conduction from the second pilot valve to the liquid tank.

5. The intrinsically safe type electric control shut-off valve according to claim 1, wherein It also includes a filter. The first liquid inlet is connected to the liquid inlet end through a second branch, and the filter is arranged on the second branch.

6. The intrinsically safe type electric control shut-off valve according to claim 1, characterized in that, The first pilot valve is in a first state when it is in a de-energized state, in a second state when it is in a energized state, in a third state when it is in a de-energized state, and in a fourth state when it is in a energized state.

7. The intrinsically safe type electric control shut-off valve according to claim 1, characterized in that, The hydraulically controlled one-way valve includes a valve sleeve, a valve core, and a reset member. The valve sleeve is provided with a valve cavity, a first inlet, a first outlet, and a sealing portion. The valve core is provided with an action portion. The valve core is slidably arranged in the valve cavity. The reset member is used to drive the valve core to slide so that the valve core is in sealing contact with the sealing portion. The first inlet is arranged corresponding to the action portion, and one end of the valve core is arranged corresponding to the control cavity.

8. The intrinsically safe type electric control shut-off valve according to claim 7, characterized in that, The action portion includes a groove structure, which has a first action surface and a second action surface on one side along the valve core opening direction and the other side along the valve core closing direction, respectively. The pressure-bearing area of the first action surface is larger than the pressure-bearing area of the second action surface.

9. The intrinsically safe type electric control shut-off valve according to claim 7, characterized in that, A first conical surface portion is provided at one end of the valve core along the closing direction, and the first conical surface portion is used for sealing contact with the conical surface of the sealing portion.

10. The intrinsically safe type electric control shut-off valve according to claim 7, characterized in that, The valve sleeve includes a first valve sleeve, a valve body, and a plug cover. The valve body is provided with an installation cavity. The first valve sleeve is located in the installation cavity. The plug cover is connected to the valve body to limit the first valve sleeve. The plug cover is provided with the control cavity.

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