safety valve

Abstract

This disclosure provides a safety valve, belonging to the field of valve technology. The safety valve includes a valve body, a first valve core assembly, an operating assembly, and a second valve core assembly. The valve body has a first oil inlet channel, a second oil inlet channel, a connecting channel, and a return channel. The first valve core assembly is movably located within the valve body. The operating assembly is located outside the valve body and connected to the first valve core assembly. The operating assembly controls the movement of the first valve core assembly to disconnect or connect the first oil inlet channel with the connecting channel. The second valve core assembly is movably located within the valve body and spaced from the first valve core assembly. The second valve core assembly is configured to move under the influence of oil pressure in the connecting channel and oil pressure in the second oil inlet channel. This disclosure can improve the reliability of the safety valve.

Description

Technical Field

[0001] This disclosure pertains to the field of valve technology, and particularly relates to a safety valve. Background Technology

[0002] Safety valves are a type of automatic valve, mainly used in boilers, pressure vessels, and pipelines to control the pressure in the connected equipment to not exceed a specified value, thereby protecting personal safety and the operation of the equipment.

[0003] In related technologies, a safety valve includes a valve body and a valve core. The valve core is movably located within the valve body. The valve body has an inlet channel, a return channel, and a control channel. The inlet channel introduces oil into the safety valve, and the return channel discharges oil from the safety valve. The control channel introduces control oil to move the valve core, thus connecting or disconnecting the inlet and return channels. That is, when the pressure of the oil in the control channel is high enough, it can move the valve core, gradually connecting the inlet and return channels, opening the safety valve, and allowing the oil in the inlet channel to be released through the return channel. Conversely, when the pressure of the oil in the control channel is insufficient to move the valve core, the valve core returns to its original position, disconnecting the inlet and return channels, and closing the safety valve.

[0004] However, the safety valves mentioned above are generally used in conjunction with solenoid valves. This means that the flow rate and pressure of the hydraulic fluid entering the control passage of the safety valve are controlled by adjusting the opening size of the solenoid valve, thereby controlling the safety valve. This type of electro-hydraulic safety valve is not only expensive but also susceptible to electromagnetic interference in the environment, resulting in lower reliability. Summary of the Invention

[0005] This disclosure provides a safety valve that can improve its reliability. The technical solution is as follows:

[0006] This disclosure provides a safety valve, comprising a valve body, a first valve core assembly, an operating assembly, and a second valve core assembly. The valve body has a first oil inlet channel, a second oil inlet channel, a connecting channel, and a return oil channel. The first valve core assembly is movably located within the valve body. The operating assembly is located outside the valve body and connected to the first valve core assembly. The operating assembly controls the movement of the first valve core assembly to disconnect or connect the first oil inlet channel with the connecting channel. The second valve core assembly is movably located within the valve body and spaced apart from the first valve core assembly. The second valve core assembly is configured to move under the influence of oil pressure in the connecting channel and oil pressure in the second oil inlet channel to cut off the second oil inlet channel and the return oil channel when the first oil inlet channel is connected to the connecting channel, and to connect the second oil inlet channel and the return oil channel when the oil inlet channel is disconnected from the connecting channel.

[0007] In another implementation of this disclosure, the first oil inlet channel includes a first sub-oil inlet channel and a second sub-oil inlet channel arranged at intervals, and the connecting channel includes a first sub-connecting channel and a second sub-connecting channel arranged at intervals; the first valve core assembly includes a directional valve core, and the first end of the directional valve core is connected to the operating component; the directional valve core has a first internal flow channel inside, and when the directional valve core is in the first position, the first internal flow channel connects the first sub-oil inlet channel and the first sub-connecting channel; when the directional valve core is in the second position, the second sub-oil inlet channel and the second sub-connecting channel are connected; when the directional valve core is in the middle position, the first sub-oil inlet channel, the second sub-oil inlet channel, the first sub-connecting channel, and the second sub-connecting channel are disconnected from each other.

[0008] In another implementation of this disclosure, the valve body has a first cavity, and the directional valve core is located in the first cavity. The first cavity is connected to the first sub-inlet channel, the second sub-inlet channel, the first sub-connecting channel, and the second sub-connecting channel, respectively. The directional valve core includes a directional valve core body, the outer periphery of which slides against the inner wall of the first cavity. The directional valve core body is provided with an annular first groove and a second groove spaced along its length. The first groove is connected to the first end of the first inner flow channel, and the second groove is located between the first groove and the second end of the first inner flow channel. The second end of the first inner flow channel is closed. When the directional valve core is in the first position, the first groove is connected to the first sub-inlet channel, and the second end of the first inner flow channel is connected to the first sub-connecting channel. When the directional valve core is in the second position, the second groove connects the second sub-inlet channel and the second sub-connecting channel. When the directional valve core is in the middle position, the directional valve core body blocks the first sub-connecting channel and the second sub-connecting channel.

[0009] In another implementation of this disclosure, the directional valve core further includes a first connecting segment and a second connecting segment, the first connecting segment and the second connecting segment being respectively connected to both ends of the directional valve core body, the first connecting segment being connected to the operating component; the first valve core assembly further includes a first elastic member, at least a portion of the first elastic member being sleeved outside the second connecting segment, and both ends of the first elastic member being clamped between the second connecting segment and the valve body.

[0010] In another implementation of this disclosure, the valve body has a second cavity, which is connected to the first sub-connecting channel, the second sub-connecting channel, the second oil inlet channel, and the oil return channel, respectively; the second valve core assembly includes a main valve core, which is movably located in the second cavity, and the main valve core has a second internal flow channel inside, the first end of which is connected to the second sub-connecting channel; the first end of the main valve core and the valve body form a first driving oil cavity, which is connected to the first sub-connecting channel; the outer wall of the main valve core near its first end and the valve body form a second driving oil cavity, which is connected to the second end of the second internal flow channel; the outer wall of the main valve core near its second end and the valve body form a third driving oil cavity, which is connected to the second oil inlet channel.

[0011] In another implementation of this disclosure, the outer wall of the main valve core slides in contact with the inner wall of the second cavity. The outer wall of the main valve core has an annular groove in the middle, which communicates with the third driving oil cavity and the second cavity respectively. The third driving oil cavity and the second driving oil cavity are located on opposite sides of the annular groove, and the first driving oil cavity and the second driving oil cavity are located on the same side of the annular groove respectively. When the directional valve core is in the first and second positions, the annular groove is connected to the second oil inlet channel. When the directional valve core is in the neutral position, the annular groove is connected to the second oil inlet channel and the return oil channel respectively.

[0012] In another implementation of this disclosure, the main valve core has a plurality of throttling holes in the outer wall of the side of the annular groove facing the third driving oil chamber. The plurality of throttling holes are arranged circumferentially with the center of the main valve core as the center, and the two ends of each of the plurality of throttling holes are respectively connected to the annular groove and the third driving oil chamber.

[0013] In another implementation of this disclosure, the safety valve further includes a second elastic element, which is sleeved outside the main valve core and located in the third drive oil chamber. The two ends of the second elastic element are respectively clamped between the valve body and the outer wall of the main valve core.

[0014] In another implementation of this disclosure, the operating component includes a connector, a reversing handle, and a handle pin. One side of the connector is connected to the first valve core assembly, and the other side of the connector is connected to the reversing handle. The reversing handle is movably connected to the valve body and is used to drive the connector to move the first valve core assembly. The handle pin is connected to both the reversing handle and the valve body and is used to control the reversing handle and the valve body to remain relatively stationary.

[0015] In another implementation of this disclosure, the valve body includes a first end cap, a second end cap, and a valve block, wherein the first end cap and the second end cap are respectively connected to opposite sides of the valve block.

[0016] The beneficial effects of the technical solutions provided in this disclosure are:

[0017] When the safety valve provided in this embodiment is used, the operating component controls the movement of the first valve core assembly to disconnect or connect the first oil inlet channel with the connecting channel. The second valve core assembly is configured to move under the influence of oil pressure in the connecting channel and oil pressure in the second oil inlet channel. When the first oil inlet channel is connected to the connecting channel, it cuts off the second oil inlet channel and the return oil channel; when the first oil inlet channel is disconnected from the connecting channel, it connects the second oil inlet channel and the return oil channel. This allows the operating component to control the position of the first valve core assembly. When the first valve core assembly is positioned to connect the first oil inlet channel with the connecting channel, oil can enter the valve body from the first oil inlet channel and, after passing through the connecting channel, allow the second valve core assembly to move and cut off the second oil inlet channel and the return oil channel, preventing the return oil channel from releasing oil from the second oil inlet channel. When the position of the first valve core assembly is such that it can disconnect the first oil inlet channel from the connecting channel, the oil cannot enter the valve body from the first oil inlet channel. The second valve core assembly cannot cut off the second oil inlet channel and the return oil channel. Instead, as the oil pressure in the second oil inlet channel gradually increases, it drives the second valve core assembly to move, so that the return oil channel connects with the second oil inlet channel. The return oil channel can release the oil that has entered the second oil inlet channel, thereby protecting the equipment or system connected to the second oil inlet channel and ensuring that the oil pressure of the equipment or system does not exceed the threshold.

[0018] In other words, for the above safety valves to function properly, the position of the first valve core assembly must be controlled by the operating component to disconnect the first oil inlet channel from the connecting channel. Otherwise, the safety valve will be in a malfunctioning state and will not be able to release the high-pressure oil in the second oil inlet channel. This allows for manual operation of the operating component to adjust the position of the first valve core assembly, enabling the safety valve to function normally and avoiding the need for electromagnetic control of the valve core position, thus greatly improving the reliability of the safety valve. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a safety valve provided in an embodiment of this disclosure;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle part of the valve body;

[0022] Figure 3 yes Figure 1 Schematic diagram of the valve core of the directional valve;

[0023] Figure 4 for Figure 1 Schematic diagram of the main valve core;

[0024] Figure 5 for Figure 1 An exploded view of the middle section structure;

[0025] Figure 6 This is a schematic diagram of the valve body.

[0026] The symbols in the diagram represent the following meanings:

[0027] 1. Valve body; 101. First oil inlet channel; 1011. First sub-oil inlet channel; 10111. First sub-oil inlet section; 10112. First oil inlet annular groove; 1012. Second sub-oil inlet channel; 10121. Second sub-oil inlet section; 10122. Second oil inlet annular groove; 102. Second oil inlet channel; 1021. Second oil inlet section; 1022. Second oil inlet groove; 103. Connecting channel; 1031. First sub-connecting channel; 10311. First sub-connecting section; 10312. First connecting annular groove; 1032. Second sub-connecting channel; 10321. Second sub-connecting section; 10322. Second connecting annular groove; 1001. First chamber; 1002. Second chamber; 1003. Main chamber section; 1004, Guide cavity section; 104, Oil return channel; 1041, Oil return section; 1042, Oil return groove; 11, First end cap; 111, First cover body; 1111, First valve core hole; 1112, First branch oil passage; 1113, Second branch oil passage; 1114, Third branch oil passage; 112, First insertion section; 12, Second end cap; 121, Second cover body; 1211, Second valve core hole; 1212, Fourth branch oil passage; 1213, Fifth branch oil passage; 1214, Sixth branch oil passage; 122, Second insertion section; 123, Third insertion section; 13, Valve block; 131, Seventh branch oil passage; 132, Eighth branch oil passage; 15, Handle cover; 150, Slide groove;

[0028] 2. First valve core assembly; 21. Reversing valve core; 2101. First inner flow channel; 211. Reversing valve core body; 2111. First groove; 2112. Second groove; 2102. First flow hole; 2103. Second flow hole; 212. First connecting section; 213. Second connecting section; 214. Plug; 22. First elastic element;

[0029] 3. Operating components; 31. Connecting parts; 32. Reversing handle; 33. Handle pin;

[0030] 4. Second valve core assembly; 401. First drive oil chamber; 402. Second drive oil chamber; 403. Third drive oil chamber; 41. Main valve core; 411. Main valve core body; 4110. Second inner flow channel; 4111. Third flow hole; 412. First boss; 4120. Throttling hole; 413. Second boss; 414. Guide section; 4100. Annular groove; 42. Second elastic element. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0032] This disclosure provides a safety valve, such as Figure 1As shown, the safety valve includes a valve body 1, a first valve core assembly 2, an operating assembly 3, and a second valve core assembly 4. The valve body 1 has a first oil inlet channel 101, a second oil inlet channel 102, a connecting channel 103, and a return oil channel 104.

[0033] The first valve core assembly 2 is movably located inside the valve body 1. The operating assembly 3 is located outside the valve body 1 and connected to the first valve core assembly 2. The operating assembly 3 is used to control the movement of the first valve core assembly 2 to disconnect or connect the first oil inlet channel 101 with the connecting channel 103. The second valve core assembly 4 is movably located inside the valve body 1 and spaced apart from the first valve core assembly 2. The second valve core assembly 4 is configured to move under the action of the oil pressure in the connecting channel 103 and the oil pressure in the second oil inlet channel 102, so as to cut off the second oil inlet channel 102 and the return oil channel 104 when the first oil inlet channel 101 is connected to the connecting channel 103, and to connect the second oil inlet channel 102 and the return oil channel 104 when the first oil inlet channel 101 is disconnected from the connecting channel 103.

[0034] When the safety valve provided in this embodiment is used, the operating component 3 controls the movement of the first valve core assembly 2 to disconnect or connect the first oil inlet channel 101 with the connecting channel 103. The second valve core assembly 4 is configured to move under the influence of oil pressure in the connecting channel 103 and oil pressure in the second oil inlet channel 102. When the first oil inlet channel 101 is connected to the connecting channel 103, it cuts off the second oil inlet channel 102 and the return oil channel 104; and when the first oil inlet channel 101 is disconnected from the connecting channel 103, it connects the second oil inlet channel 102 and the return oil channel 104. In this way, the operating component 3 can be controlled to control the position of the first valve core assembly 2. When the position of the first valve core assembly 2 is such that the first oil inlet channel 101 is connected to the connecting channel 103, the oil can enter the valve body 1 from the first oil inlet channel 101 and pass through the connecting channel 103, so that the second valve core assembly 4 can move to cut off the second oil inlet channel 102 and the return oil channel 104, thereby preventing the return oil channel 104 from releasing the oil in the second oil inlet channel 102. When the position of the first valve core assembly 2 can disconnect the first oil inlet channel 101 from the connecting channel 103, the oil cannot enter the valve body 1 from the first oil inlet channel 101. The second valve core assembly 4 cannot cut off the second oil inlet channel 102 and the return oil channel 104. Instead, as the oil pressure in the second oil inlet channel 102 gradually increases, the second valve core assembly 4 moves, causing the return oil channel 104 to connect with the second oil inlet channel 102. The return oil channel 104 can release the oil that has entered the second oil inlet channel 102, thereby protecting the equipment or system connected to the second oil inlet channel 102 and ensuring that the oil pressure of the equipment or system does not exceed the threshold.

[0035] In other words, for the safety valve to function properly, the position of the first valve core assembly 2 must be controlled by the operating component 3 to disconnect the first oil inlet channel 101 from the connecting channel 103. Otherwise, the safety valve will be in a malfunctioning state and will not be able to release the high-pressure oil in the second oil inlet channel 102. This allows the operating component 3 to be manually operated to adjust the position of the first valve core assembly 2, thus enabling the safety valve to function normally. This avoids the safety valve relying on electromagnetic or other means to control the valve core position, greatly improving the reliability of the safety valve.

[0036] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle valve body, combined with... Figure 2 Optionally, the first oil inlet channel 101 includes a first sub-oil inlet channel 1011 and a second sub-oil inlet channel 1012 arranged at intervals. The connecting channel 103 includes a first sub-connecting channel 1031 and a second sub-connecting channel 1032 arranged at intervals.

[0037] In this embodiment, for ease of arrangement, the first sub-oil inlet 1011 and the second sub-oil inlet 1012 are located in the middle of the same side wall of the valve body 1.

[0038] Figure 3 yes Figure 1 A schematic diagram of the structure of the directional valve core, combined with... Figure 3 The first valve core assembly 2 includes a directional valve core 21, the first end of which is connected to the operating assembly 3. The directional valve core 21 has a first internal flow channel 2101. When the directional valve core 21 is in the first position, the first internal flow channel 2101 connects the first sub-inlet channel 1011 and the first sub-connecting channel 1031. When the directional valve core 21 is in the second position, the second sub-inlet channel 1012 and the second sub-connecting channel 1032 are connected. When the directional valve core 21 is in the neutral position, the first sub-inlet channel 1011, the second sub-inlet channel 1012, the first sub-connecting channel 1031, and the second sub-connecting channel 1032 are disconnected from each other.

[0039] In the above implementation, setting the first valve core assembly 2 as the directional valve core 21 allows the directional valve core 21 to have three position states. The three position states include the first position (i.e., the first position...). Figure 1 (middle left position), middle position (that is) Figure 1 (middle state) and the second bit (that is) Figure 1 (Middle right position). In this way, by ensuring that the first valve core assembly 2 is only in the middle position, the first oil inlet channel 101 and the connecting channel 103 can be disconnected from each other, thereby allowing the second valve core assembly 4 to connect the second oil inlet channel 102 and the return channel 104, so that the safety valve can work normally.

[0040] In other words, by setting the directional valve core 21, the safety valve can only be in working condition when the directional valve core 21 is controlled in the neutral position by the operating component 3; otherwise, the safety valve will be in an ineffective state. This improves the control accuracy of the safety valve.

[0041] As described above, when the directional valve core 21 is in the first position, the oil enters the valve body 1 through the first sub-inlet channel 1011, then enters the first internal flow channel 2101, and then enters the first sub-connecting channel 1031, so that the first inlet channel 101 and the connecting channel 103 are connected, thereby causing the second valve core assembly 4 to cut off the second inlet channel 102 and the return channel 104.

[0042] When the directional valve core 21 is in the second position, the oil enters the valve body 1 through the second sub-inlet channel 1012 and then enters the second sub-connecting channel 1032, so that the first inlet channel 101 and the connecting channel 103 are connected, thereby causing the second valve core assembly 4 to cut off the second inlet channel 102 and the return channel 104.

[0043] When the directional valve core 21 is in the neutral position, the first sub-inlet channel 1011, the second sub-inlet channel 1012, the first sub-connecting channel 1031, and the second sub-connecting channel 1032 are disconnected from each other. Oil will not enter the first sub-connecting channel 1031 or the second sub-connecting channel 1032 from either the first sub-inlet channel 1011 or the second sub-inlet channel 1012. This allows the second valve core assembly 4 to connect with the return channel 104 and release high-pressure oil when the oil pressure in the second inlet channel 102 is greater than the threshold.

[0044] In other examples, the first valve core assembly 2 and the first oil inlet channel 101 may also be other structures, such as the first oil inlet channel 101 only including the first sub-oil inlet channel.

[0045] Combination Figure 2 and Figure 3 Optionally, the valve body 1 has a first cavity 1001, and the directional valve core 21 is located in the first cavity 1001. The first cavity 1001 is connected to the first sub-inlet channel 1011, the second sub-inlet channel 1012, the first sub-connecting channel 1031, and the second sub-connecting channel 1032. The directional valve core 21 includes a directional valve core body 211. The outer periphery of the directional valve core body 211 slides against the inner wall of the first cavity 1001. The directional valve core body 211 is provided with annular first grooves 2111 and second grooves 2112 spaced along its own length direction. The first groove 2111 is connected to the first end of the first inner flow channel 2101, and the second groove 2112 is located between the first groove 2111 and the second end of the first inner flow channel 2101. The second end of the first inner flow channel 2101 is in a closed state.

[0046] When the directional valve core 21 is in the first position, the first groove 2111 is connected to the first sub-inlet oil passage 1011, and the second end of the first inner flow passage 2101 is connected to the first sub-connecting channel 1031. When the directional valve core 21 is in the second position, the second groove 2112 connects the second sub-inlet oil passage 1012 and the second sub-connecting channel 1032. When the directional valve core 21 is in the middle position, the directional valve core body 211 blocks the first sub-connecting channel 1031 and the second sub-connecting channel 1032.

[0047] In the above implementation, the first cavity 1001 is used to provide a mounting base for the directional valve core 21. The first groove 2111 and the second groove 2112 are used to form a groove on the outer wall of the directional valve core body 211 so as to communicate with the first sub-inlet passage 1011 or the second sub-inlet passage 1012 through the groove.

[0048] As described above, when the directional valve core 21 is in the first position, the oil flows sequentially through the first sub-inlet channel 1011, the first tank 2111, the first inner flow channel 2101 and the first sub-connecting channel 1031, so that the first inlet channel 101 and the connecting channel 103 are connected, thereby causing the second valve core assembly 4 to cut off the second inlet channel 102 and the return channel 104.

[0049] When the directional valve core 21 is in the second position, the oil flows sequentially through the second sub-inlet channel 1012, the second tank 2112, and the second sub-connecting channel 1032, so that the first inlet channel 101 and the connecting channel 103 are connected, thereby causing the second valve core assembly 4 to cut off the second inlet channel 102 and the return channel 104.

[0050] When the directional valve core 21 is in the neutral position, the first sub-connecting channel 1031 and the second sub-connecting channel 1032 are blocked by the directional valve core body 211. Oil will not enter the first sub-connecting channel 1031 or the second sub-connecting channel 1032 from either the first sub-inlet channel 1011 or the second sub-inlet channel 1012. This allows the second valve core assembly 4 to connect with the return channel 104 and release high-pressure oil when the oil pressure in the second inlet channel 102 is greater than the threshold.

[0051] In this embodiment, to facilitate the arrangement of the above oil passages, the first sub-inlet passage 1011 includes a first sub-inlet section 10111 and a first inlet annular groove 10112 that are interconnected. The second sub-inlet passage 1012 includes a second sub-inlet section 10121 and a second inlet annular groove 10122 that are interconnected. The first sub-connecting passage 1031 includes a first sub-connecting section 10311 and a first connecting annular groove 10312 that are interconnected, and the second sub-connecting passage 1032 includes a second sub-connecting section 10321 and a second connecting annular groove 10322 that are interconnected.

[0052] Along the direction from the first end to the second end of the reversing valve core body 211, the first oil inlet annular groove 10112, the second connecting annular groove 10322, the second oil inlet annular groove 10122, and the first connecting annular groove 10312 are arranged coaxially and sequentially outside the first cavity 1001, and all communicate with the first cavity 1001. The oil inlet of the first sub-oil inlet section 10111 and the oil inlet of the second sub-oil inlet section 10121 are both located on the same side wall of the valve body 1 at intervals. The first sub-connecting section 10311 and the second sub-connecting section 10321 are located on the side of the first cavity 1001 away from the first sub-oil inlet section 10111.

[0053] Thus, when the directional valve core 21 is in the first position, the first groove 2111 and the first oil inlet ring groove 10112 at least partially overlap, and the second end of the first inner flow channel 2101 communicates with the first connecting ring groove 10312. When the directional valve core 21 is in the second position, the opposite sides of the second groove 2112 are located in the second connecting ring groove 10322 and the second oil inlet ring groove 10122, respectively.

[0054] Located on both sides of the second groove 2112, respectively, the reversing valve core body 211 is attached to the groove wall of the second connecting ring groove 10322 and the groove wall of the first connecting ring groove 10312, so as to separate the second connecting ring groove 10322 from the second sub-connecting section 10321, and to separate the first connecting ring groove 10312 from the first sub-connecting section 10311.

[0055] In addition, to facilitate communication between the first inner flow channel 2101 and the first groove 2111, the reversing valve core body 211 also has a plurality of first flow holes 2102 and a plurality of second flow holes 2103. The plurality of first flow holes 2102 are arranged circumferentially at intervals around the center of the reversing valve core body 211. Each first flow hole 2102 extends radially along the reversing valve core body 211, and both ends of each first flow hole 2102 are connected to the first end of the first groove 2111 and the first inner flow channel 2101, respectively. The plurality of second flow holes 2103 are arranged circumferentially at intervals around the center of the reversing valve core body 211. Each second flow hole 2103 extends radially along the reversing valve core body 211, and both ends of the second flow hole 2103 are connected to the second end of the first cavity 1001 and the first inner flow channel 2101, respectively.

[0056] See Figure 1 and Figure 3 Optionally, the directional valve core 21 further includes a first connecting section 212 and a second connecting section 213, which are respectively connected to the two ends of the directional valve core body 211. The first connecting section 212 is connected to the operating component 3.

[0057] The first valve core assembly 2 also includes a first elastic element 22, at least a portion of which is sleeved outside the second connecting section 213 shown, and both ends of the first elastic element 22 are clamped between the second connecting section 213 and the valve body 1.

[0058] In the above implementation, the first connecting segment 212 is used to connect to the operating component 3, and the second connecting segment 213 is used to abut against the first elastic member 22 so as to clamp the first elastic member 22 in the valve body 1.

[0059] The first elastic element 22 is a telescopic spring.

[0060] In this embodiment, for ease of processing, the first inner flow channel 2101 starts from the part of the reversing valve core body 211 where the first groove 2111 is located, and extends all the way to the end face of the second connecting section 213 toward the first elastic member 22.

[0061] The directional valve core 21 also includes a plug 214, which is located in the first inner flow channel 2101 and is in sealing contact with the second connecting section 213. The plug 214 is used to block the second end of the first inner flow channel 2101.

[0062] Combination Figure 2 Optionally, the valve body 1 has a second chamber 1002, which is connected to the first sub-connecting channel 1031, the second sub-connecting channel 1032, the second oil inlet channel 102 and the oil return channel 104 respectively.

[0063] Figure 4 for Figure 1 A schematic diagram of the structure of the main valve core, combined with... Figure 4 The second valve core assembly 4 includes a main valve core 41, which is movably located in the second cavity 1002. The main valve core 41 has a second internal flow channel 4110 inside, and the first end of the second internal flow channel 4110 is connected to the second sub-connecting channel 1032.

[0064] Combination Figure 1 , Figure 2 and Figure 4 The first end of the main valve core 41 forms a first driving oil chamber 401 with the valve body 1. The first driving oil chamber 401 is connected to the first sub-connecting channel 1031. The outer wall of the main valve core 41 near its first end forms a second driving oil chamber 402 with the valve body 1. The second driving oil chamber 402 is connected to the second end of the second inner flow channel 4110. The outer wall of the main valve core 41 near its second end forms a third driving oil chamber 403 with the valve body 1. The third driving oil chamber 403 is connected to the second oil inlet channel 102.

[0065] In the above implementation, the first driving oil chamber 401 and the second driving oil chamber 402 are used to drive the main valve core 41 to move toward the second end, so that the main valve core 41 can disconnect the second oil inlet channel 102 and the oil return channel 104. The third driving oil chamber 403 is used to drive the main valve core 41 to move toward the second end until the second oil inlet channel 102 and the oil return channel 104 are connected to achieve pressure relief. The second internal flow channel 4110 is used to introduce oil into the second driving oil chamber 402 so that when the directional valve core 21 is in the second position, the second driving oil chamber 402 can drive the main valve core 41 to move to the left to disconnect the second oil inlet channel 102 and the oil return channel 104.

[0066] Optionally, the outer wall of the main valve core 41 is in sliding contact with the inner wall of the second cavity 1002. The outer wall of the main valve core 41 has an annular groove 4100 in the middle. The annular groove 4100 is connected to both the third driving oil cavity 403 and the second cavity 1002. The third driving oil cavity 403 and the second driving oil cavity 402 are located on opposite sides of the annular groove 4100, and the first driving oil cavity 401 and the second driving oil cavity 402 are located on the same side of the annular groove 4100.

[0067] When the directional valve core 21 is in the first and second positions, the annular groove 4100 is connected to the second oil inlet channel 102. When the directional valve core 21 is in the middle position, the annular groove 4100 is connected to the second oil inlet channel 102 and the return oil channel 104 respectively.

[0068] In the above implementation, the main valve core 41 is configured with the above structure, which can connect the third drive oil chamber 403 with the second oil inlet channel 102 through the annular groove 4100. At the same time, after the main valve core 41 moves toward the second end, it connects the second oil inlet channel 102 with the return oil channel 104 to achieve pressure relief.

[0069] To form the annular groove 4100, the main valve core 41 includes a main valve core body 411, an annular first boss 412, and an annular second boss 413. The first boss 412 and the second boss 413 are connected at intervals along the length direction of the main valve core body 411 to the outer wall of the main valve core body 411, and both the first boss 412 and the second boss 413 are slidably fitted against the inner wall of the second cavity 1002, defining the annular groove 4100 between the first boss 412 and the second boss 413. The first boss 412 is located on the side of the annular groove 4100 facing the second end of the main valve core 41.

[0070] In the above implementation, the first boss 412 and the second boss 413 can isolate the connection between the second oil inlet channel 102 and the oil return channel 104, thereby enabling the main valve core 41 to be in a state of failure or normal operation.

[0071] Optionally, the first boss 412 has a plurality of throttling holes 4120, which are arranged circumferentially at intervals around the center of the first boss 412. The two ends of each throttling hole 4120 are located on opposite end faces in the axial direction of the first boss 412. The two ends of each throttling hole 4120 are respectively connected to the annular groove 4100 and the third driving oil chamber 403.

[0072] In the above implementation, the throttle orifice 4120 connects the second oil inlet channel 102 with the third drive oil chamber 403, so that when the pressure in the first drive oil chamber 401 and the second drive oil chamber 402 is zero, the third drive oil chamber 403 can drive the main valve core 41 to move to the right. Under the balance of damping force, the main valve core 41 slowly moves to the right until the main valve core body 411 between the first boss 412 and the second boss 413 can connect the second oil inlet channel 102 with the return oil channel 104, and the safety valve performs high-pressure oil depressurization.

[0073] The main valve core body 411 has a plurality of third flow holes 4111, which are arranged circumferentially around the center of the main valve core body 411, and the two ends of each third flow hole 4111 are respectively connected to the second inner flow channel 4110 and the second drive oil chamber 402.

[0074] Optionally, the main valve core 41 further includes a guide section 414, which is coaxially connected to the end of the main valve core body 411 away from the third drive oil chamber 403. The outer diameter of the guide section 414 is smaller than the outer diameter of the first boss 412 and also smaller than the outer diameter of the second boss 413.

[0075] Figure 5 for Figure 1 An exploded view of the middle part of the structure, combined with Figure 5 The second cavity 1002 includes a main cavity section 1003 and a guide cavity section 1004 that are interconnected. The main cavity section 1003 and the guide cavity section 1004 are arranged sequentially along the moving direction of the main valve core 41. The main valve core body 411 is located in the main cavity section 1003, and the guide section 414 is at least partially located in the guide cavity section 1004 and is in sliding contact with the inner wall of the guide cavity section 1004.

[0076] In the above implementation, the guide section 414 is used to cooperate with the guide cavity section 1004 to limit the movement of the main valve core 41, so that the main valve core 41 can only move in a straight line.

[0077] In this embodiment, to facilitate the arrangement of the above oil passages, the second oil inlet channel 102 includes a second oil inlet section 1021 and an annular second oil inlet groove 1022 that are interconnected. The oil return channel 104 includes an oil return section 1041 and an annular oil return groove 1042 that are interconnected.

[0078] The oil inlet of the second oil inlet section 1021 and the oil return port of the oil return section 1041 are both located on the same side wall of the valve body 1 at intervals, and are arranged opposite to the oil inlet of the first sub-oil inlet section 10111 and the oil inlet of the second sub-oil inlet channel 1012. Along the direction from the main cavity section 1003 to the guide cavity section 1004 of the second cavity 1002, the second oil inlet groove 1022 and the oil return groove 1042 are arranged coaxially and sequentially at intervals outside the second cavity 1002, and are both connected to the second cavity 1002.

[0079] Combination Figure 1 Optionally, the safety valve also includes a second elastic element 42, which is sleeved outside the main valve core 41 and located in the third drive oil chamber 403. The two ends of the second elastic element 42 are respectively clamped between the valve body 1 and the outer wall of the main valve core 41.

[0080] In the above implementation, the second elastic element 42 is used to drive the main valve core 41 to move to the right. When the high-pressure oil in the second oil inlet channel 102 enters the third drive oil chamber 403 through the throttle orifice 4120, the main valve core 41 will slowly move to the right under the balance of the spring force and damping force of the second elastic element 42, until the annular groove 4100 between the first boss 412 and the second boss 413 connects the second oil inlet channel 102 with the return oil channel 104, the high-pressure oil in the system is depressurized, and the safety valve is effective. The second elastic element 42 is a telescopic spring.

[0081] See also Figure 1 Optionally, the operating component 3 includes a connector 31, a reversing handle 32, and a handle pin 33. One side of the connector 31 is connected to the first valve core assembly 2, and the other side of the connector 31 is connected to the reversing handle 32. The reversing handle 32 is movably connected to the valve body 1 and is used to drive the connector 31 to move the first valve core assembly 2. The handle pin 33 is connected to both the reversing handle 32 and the valve body 1, and is used to keep the reversing handle 32 and the valve body 1 relatively stationary after the first valve core assembly 2 has moved.

[0082] In the above implementation, the connector 31 is used to connect the first valve core assembly 2 and the reversing handle 32 together. The reversing handle 32 is used to drive the connector 31 to move, so that the connector 31 can drive the first valve core assembly 2 to move when it moves. The handle pin 33 is used to lock the reversing handle 32 to the valve body 1 after the first valve core assembly 2 has moved, so as to fix the position of the first valve core assembly 2.

[0083] In this embodiment, the connector 31 is a pin, with one end inserted into the first valve core assembly 2 and the other end inserted into the slot of the reversing handle 32. Thus, by pushing the reversing handle 32 left or right, the movement of the first valve core assembly 2 can be controlled, ultimately adjusting its position to the first, second, or middle position, etc.

[0084] In other examples, the connector 31 may also be a screw or similar component. One end of the connector 31 is threadedly connected to the first valve core assembly 2, and the other end of the connector 31 is fixedly inserted into the slot of the reversing handle 32 by a screw or other fastener. The reversing handle 32, carrying the connector 31, is controlled to rotate around its own axis (the axis direction is...). Figure 1 The connector 31 rotates along the thread of the first valve core assembly 2 (in the left and right directions), thereby causing the first valve core assembly 2 to move along the length of the connector 31, and finally adjusting the position of the first valve core assembly 2 to the first position, second position, or middle position, etc.

[0085] The handle pin 33 is a pin. After the first valve core assembly 2 moves, the handle pin 33 is simultaneously inserted into the reversing handle 32 and the valve body 1 to fix the position of the first valve core assembly 2.

[0086] Figure 6 This is a structural diagram of the valve body, combined with... Figure 6 Optionally, the valve body 1 includes a first end cap 11, a second end cap 12, and a valve block 13, wherein the first end cap 11 and the second end cap 12 are detachably connected to opposite sides of the valve block 13.

[0087] In the above implementation, by setting the valve body 1 to the above structure, it is convenient to install the first valve core assembly 2 and the second valve core assembly 4, etc.

[0088] In this embodiment, the first end cap 11 includes a first cover body 111 and a first insertion segment 112. The first insertion segment 112 is connected to the side of the first cover body 111 facing the valve body 1 and is sealed and inserted into the second cavity 1002 of the valve body 1. The second end cap 12 includes a second cover body 121, a second insertion segment 122, and a third insertion segment 123. The second insertion segment 122 and the third insertion segment 123 are connected to the side of the second cover body 121 facing the valve body 1 at intervals. The second insertion segment 122 is sealed and inserted into the first cavity 1001 of the valve body 1. The third insertion segment 123 is sealed and inserted into the main cavity section 1003 of the second cavity 1002 of the valve body 1. The interior of the third insertion segment 123 forms a guide cavity section 1004 of the second cavity 1002.

[0089] The first cover 111 has a first valve core hole 1111, a first branch oil passage 1112, a second branch oil passage 1113, and a third branch oil passage 1114. The first valve core hole 1111 connects the opposite sides of the first cover 111, and the extension direction of the first valve core hole 1111 is the same as the length direction of the first insertion section 112. The first connecting section 212 is located in the first valve core hole 1111 and is in sealing contact with the inner wall of the first valve core hole 1111. The first end of the first branch oil passage 1112 is connected to the first end of the second branch oil passage 1113, the second end of the second branch oil passage 1113 is connected to the outside, one end of the third branch oil passage 1114 is connected to the middle part of the second branch oil passage 1113, and the other end of the third branch oil passage 1114 is connected to the interior of the first insertion section 112.

[0090] The second cover 121 has a second valve core hole 1211, a fourth branch oil passage 1212, a fifth branch oil passage 1213, and a sixth branch oil passage 1214. The extension direction of the second valve core hole 1211 is the same as the extension direction of the first valve core hole 1111. The second connecting section 213 and the first elastic member 22 are both located in the second valve core hole 1211, and the second connecting section 213 is in sealing contact with the inner wall of the second valve core hole 1211.

[0091] The first end of the fourth branch oil passage 1212 is connected to the first end of the fifth branch oil passage 1213, and the second end of the fifth branch oil passage 1213 is connected to the outside of the valve body 1. The first end of the sixth branch oil passage 1214 is connected to the middle of the fifth branch oil passage 1213, and the other end of the fifth branch oil passage 1213 is connected to the inside of the third insertion section 123 (that is, the guide cavity section 1004).

[0092] The valve block 13 has a seventh branch oil passage 131 and an eighth branch oil passage 132. One end of the seventh branch oil passage 131 is connected to the second end of the fourth branch oil passage 1212, and the other end of the seventh branch oil passage 131 is connected to the first connecting annular groove 10312. One end of the eighth branch oil passage 132 is connected to the second end of the first branch oil passage 1112, and the other end of the eighth branch oil passage 132 is connected to the second connecting annular groove 10322.

[0093] In this way, the second sub-connecting segment 10321 can be formed through the first branch oil channel 1112, the second branch oil channel 1113, the third branch oil channel 1114, and the eighth branch oil channel 132. At the same time, the first sub-connecting segment 10311 can be formed through the fourth branch oil channel 1212, the fifth branch oil channel 1213, the sixth branch oil channel 1214, and the seventh branch oil channel 131.

[0094] See you again Figure 1Optionally, the valve body 1 also includes a handle cover 15, which is connected to the side of the first end cover 11 away from the valve block 13. The handle cover 15 has a groove 150 in which the reversing handle 32 is movably located. The length direction of the groove 150 is perpendicular to the length direction of the connector 31. The handle pin 33 is inserted into the reversing handle 32 and the handle cover 15.

[0095] The slide groove 150 can limit the swing of the handle cover 15, thereby controlling the movement stroke of the first valve core assembly 2.

[0096] The assembly process of the safety valve provided in this embodiment is briefly described below:

[0097] Combination Figure 5 and Figure 6 Insert the first insertion section 112 of the first end cap 11 into the second cavity 1002 of the valve block 13, and use screws or other fasteners to press the end face of the first cap 111 against the end face of the valve block 13. Install a plug 214 into the second end of the first inner flow channel 2101, and install the reversing valve core 21 into the first cavity 1001, such that the first connecting section 212 is located in the first valve core hole 1111, and insert the connector 31 into the first connecting section 212.

[0098] Next, the second elastic element 42 is fitted over the main valve core 41, and the main valve core 41 is installed into the second cavity 1002. Then, the first elastic element 22 is installed into the second valve core hole 1211. At the same time, the second insertion section 122 is sealed and inserted into the first cavity 1001, and the third insertion section 123 is sealed and inserted into the second cavity 1002. Meanwhile, the guide section 414 is inserted into the guide cavity section 1004, and the second connecting section 213 is inserted into the second valve core hole 1211. Then, screws or the like are used to press the end face of the second cover 121 against the end face of the valve block 13.

[0099] Finally, install the reversing handle 32 and handle pin 33, and tighten the handle cover 15 to the first end cover 11 with screws, while ensuring that the reversing handle 32 and the connecting piece 31 are securely fastened together. This completes the installation of the safety valve.

[0100] The following is a brief description of the working process of the safety valve provided in the embodiments of this disclosure:

[0101] During operation, when the reversing handle 32 controls the reversing valve core 21 to be in the position as follows: Figure 1In the first stage, the remotely controlled pressure oil enters the first sub-inlet channel 1011 through the control of other external valves. After passing through the first sub-inlet channel 1011, the first internal flow channel 2101, and the first sub-connecting channel 1031, the pressure oil enters the guide cavity section 1004. The pressure oil overcomes the second elastic element 42 and pushes the main valve core 41 to move to the left. At this time, the annular groove 4100 between the first boss 412 and the second boss 413 is not connected to the return oil channel 104. The annular groove 4100 is closed, and the second inlet channel 102 and the return oil channel 104 are cut off, so the safety valve is ineffective.

[0102] When the reversing handle 32 controls the reversing valve core 21 to the second position, pressurized oil enters from the second sub-inlet channel 1012. The pressurized oil passes sequentially through the second sub-inlet channel 1012, the second groove 2112, and the second sub-connecting channel 1032, and after passing through the second inner flow channel, it enters the side of the second boss 413 away from the first boss 412. The pressure of the pressurized oil overcomes the second elastic element 42 and pushes the main valve core 41 to the left. At this time, the annular groove 4100 between the first boss 412 and the second boss 413 is closed, the second oil inlet channel 102 and the return oil channel 104 are cut off, and the safety valve is ineffective.

[0103] When the reversing handle 32 is operated to put the reversing valve core 21 in the neutral position, the remote control pressure oil cannot enter the main valve core 41 through the valve body 1. Under the thrust of the second elastic element 42, the main valve core 41 begins to move to the right, and a negative pressure is formed in the third drive oil chamber 403. At this time, the high-pressure oil in the system in the second oil inlet channel 102 enters the third drive oil chamber 403 through the throttle orifice 4120. Under the balance of spring force and damping force, the main valve core 41 slowly moves to the right until the annular groove 4100 between the first boss 412 and the second boss 413 connects the second oil inlet channel 102 with the return oil channel 104, the high-pressure oil in the system is depressurized, and the safety valve is effective.

[0104] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A safety valve, characterized in that, The safety valve includes a valve body (1), a first valve core assembly (2), an operating assembly (3), and a second valve core assembly (4). The valve body (1) has a first oil inlet channel (101), a second oil inlet channel (102), a connecting channel (103), and a return oil channel (104). The first oil inlet channel (101) includes a first sub-oil inlet channel (1011) and a second sub-oil inlet channel (1012) arranged at intervals. The connecting channel (103) includes a first sub-connecting channel (1031) and a second sub-connecting channel (1032) arranged at intervals. The first valve core assembly (2) is movably located inside the valve body (1). The first valve core assembly (2) includes a reversing valve core (21). The first end of the reversing valve core (21) is connected to the operating assembly (3). The reversing valve core (21) has a first internal flow channel (2101). When the reversing valve core (21) is in the first position, the first internal flow channel (2101) connects the first sub-inlet channel (1011) and the first sub-connecting channel (1031). When the reversing valve core (21) is in the second position, the second sub-inlet channel (1012) and the second sub-connecting channel (1032) are connected. When the reversing valve core (21) is in the middle position, the first sub-inlet channel (1011), the second sub-inlet channel (1012), the first sub-connecting channel (1031) and the second sub-connecting channel (1032) are disconnected from each other. The operating component (3) is located outside the valve body (1). The operating component (3) is used to control the movement of the first valve core assembly (2) to disconnect or connect the first oil inlet channel (101) with the connecting channel (103). The second valve core assembly (4) is movably located within the valve body (1) and spaced apart from the first valve core assembly (2). The second valve core assembly (4) is configured to move under the action of the oil pressure in the connecting channel (103) and the oil pressure in the second oil inlet channel (102) to cut off the second oil inlet channel (102) and the oil return channel (104) when the first oil inlet channel (101) is connected to the connecting channel (103), and to connect the second oil inlet channel (102) and the oil return channel (104) when the first oil inlet channel (101) is disconnected from the connecting channel (103).

2. The safety valve according to claim 1, characterized in that, The valve body (1) has a first cavity (1001), and the directional valve core (21) is located in the first cavity (1001). The first cavity (1001) is connected to the first sub-inlet channel (1011), the second sub-inlet channel (1012), the first sub-connecting channel (1031), and the second sub-connecting channel (1032), respectively. The reversing valve core (21) includes a reversing valve core body (211). The outer periphery of the reversing valve core body (211) slides against the inner wall of the first cavity (1001). The reversing valve core body (211) is provided with an annular first groove (2111) and a second groove (2112) spaced apart along its own length direction. The first groove (2111) is connected to the first end of the first inner flow channel (2101). The second groove (2112) is located between the first groove (2111) and the second end of the first inner flow channel (2101). The second end of the first inner flow channel (2101) is in a closed state. When the directional valve core (21) is in the first position, the first groove (2111) is connected to the first sub-inlet channel (1011), and the second end of the first inner flow channel (2101) is connected to the first sub-connecting channel (1031). When the directional valve core (21) is in the second position, the second groove (2112) connects the second sub-inlet channel (1012) and the second sub-connecting channel (1032). When the directional valve core (21) is in the middle position, the directional valve core body (211) blocks the first sub-connecting channel (1031) and the second sub-connecting channel (1032).

3. The safety valve according to claim 2, characterized in that, The directional valve core (21) further includes a first connecting section (212) and a second connecting section (213), the first connecting section (212) and the second connecting section (213) being connected to both ends of the directional valve core body (211), and the first connecting section (212) being connected to the operating component (3); The first valve core assembly (2) further includes a first elastic element (22), at least a portion of which is sleeved outside the second connecting segment (213) shown, and both ends of the first elastic element (22) are clamped between the second connecting segment (213) and the valve body (1).

4. The safety valve according to claim 1, characterized in that, The valve body (1) has a second cavity (1002), which is connected to the first sub-connecting channel (1031), the second sub-connecting channel (1032), the second oil inlet channel (102), and the oil return channel (104), respectively. The second valve core assembly (4) includes a main valve core (41), which is movably located in the second cavity (1002). The main valve core (41) has a second internal flow channel (4110) inside, and the first end of the second internal flow channel (4110) is connected to the second sub-connecting channel (1032). The first end of the main valve core (41) forms a first driving oil chamber (401) with the valve body (1). The first driving oil chamber (401) is connected to the first sub-connecting channel (1031). The outer wall of the main valve core (41) near its first end forms a second driving oil chamber (402) with the valve body (1). The second driving oil chamber (402) is connected to the second end of the second inner flow channel (4110). The outer wall of the main valve core (41) near its second end forms a third driving oil chamber (403) with the valve body (1). The third driving oil chamber (403) is connected to the second oil inlet channel (102).

5. The safety valve according to claim 4, characterized in that, The outer wall of the main valve core (41) slides in contact with the inner wall of the second cavity (1002). The outer wall of the main valve core (41) has an annular groove (4100) in the middle. The annular groove (4100) is connected to the third driving oil cavity (403) and the second cavity (1002) respectively. The third driving oil cavity (403) and the second driving oil cavity (402) are located on opposite sides of the annular groove (4100). The first driving oil cavity (401) and the second driving oil cavity (402) are located on the same side of the annular groove (4100). When the directional valve core (21) is in the first and second positions, the annular groove (4100) is connected to the second oil inlet channel (102). When the directional valve core (21) is in the middle position, the annular groove (4100) is connected to the second oil inlet channel (102) and the return oil channel (104) respectively.

6. The safety valve according to claim 5, characterized in that, The main valve core (41) has a plurality of throttling holes (4120) in the outer wall of the side of the annular groove (4100) facing the third driving oil chamber (403). The plurality of throttling holes (4120) are arranged circumferentially with the center of the main valve core (41) as the center. The two ends of each of the plurality of throttling holes (4120) are respectively connected to the annular groove (4100) and the third driving oil chamber (403).

7. The safety valve according to claim 5, characterized in that, The safety valve also includes a second elastic element (42), which is sleeved outside the main valve core (41) and located in the third drive oil chamber (403). The two ends of the second elastic element (42) are respectively clamped between the valve body (1) and the outer wall of the main valve core (41).

8. The safety valve according to any one of claims 1-7, characterized in that, The operating component (3) includes a connector (31), a reversing handle (32), and a handle pin (33). One side of the connector (31) is connected to the first valve core assembly (2), and the other side of the connector (31) is connected to the reversing handle (32). The reversing handle (32) is movably connected to the valve body (1). The reversing handle (32) is used to drive the connector (31) to move the first valve core assembly (2). The handle pin (33) is connected to the reversing handle (32) and the valve body (1) respectively, and is used to make the reversing handle (32) and the valve body (1) relatively stationary after the first valve core assembly (2) moves.

9. The safety valve according to any one of claims 1-7, characterized in that, The valve body (1) includes a first end cap (11), a second end cap (12), and a valve block (13), wherein the first end cap (11) and the second end cap (12) are respectively connected to opposite sides of the valve block (13).

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