Cartridge valve

Abstract

This invention relates to a cartridge valve, comprising a pilot valve body, a main valve core, and a pilot valve spool. Specifically, the pilot valve body has a main valve core mounting cavity extending along a first direction. The pilot valve body is provided with a first control fluid channel, a second control fluid channel, and a first return fluid channel spaced apart. The main valve core movably extends into the main valve core mounting cavity in the first direction. The main valve core cooperates with the pilot valve body to define a first control cavity communicating with the first control fluid channel, a second control cavity communicating with the second control fluid channel, and a return fluid cavity communicating with the first return fluid channel, all spaced apart. The pilot valve spool has a first shoulder for opening or closing the first pressure relief channel and a second shoulder for opening or closing the second pressure relief channel, respectively, arranged opposite each other in the first direction. The cartridge valve of this invention can achieve precise control of the displacement of the main valve core.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and more specifically, to a cartridge valve. Background Technology

[0002] With the development of intelligent and unmanned mining technologies, the performance of core components of the electro-hydraulic control system in fully mechanized mining faces has become a key factor restricting the intelligent development of coal mines.

[0003] In related technologies, the straightness control of the support structure of a fully mechanized mining face directly determines the mining efficiency of the coal mine. Currently, the hydraulic cylinders for the support structure of a fully mechanized mining face are mainly controlled by on / off valves. Using on / off valves to control the position and pressure of the support structure results in low accuracy in the straightness control of the hydraulic support structure, usually requiring manual intervention for compensation.

[0004] Therefore, how to improve the straightness control of the support group in the fully mechanized mining face is an urgent technical problem to be solved. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a cartridge valve that enables stepless adjustment of the position of the main valve core, thereby achieving precise control of the flow rate at the main valve port.

[0006] The cartridge valve of the present invention includes:

[0007] The pilot valve core body includes a main valve core mounting cavity that extends along a first direction. The pilot valve body is provided with a first control fluid channel, a second control fluid channel, and a first return fluid channel at intervals.

[0008] The main valve core is movably extended into the main valve core mounting cavity in the first direction. The main valve core has a main valve port that controls the flow rate of the system. The main valve port extends out of the main valve core mounting cavity in the first direction. The main valve core cooperates with the pilot valve body to define a first control cavity that communicates with the first control fluid channel, a second control cavity that communicates with the second control fluid channel, and a return fluid cavity that communicates with the first return fluid channel. The first control cavity and the second control cavity are arranged opposite to each other in the first direction. The main valve core has a pilot valve core mounting cavity that extends along the first direction. The main valve core is provided with a first pressure relief channel that communicates with the first control cavity, a second pressure relief channel that communicates with the second control cavity, and a second return fluid channel that communicates with the return fluid cavity. The first pressure relief channel, the second pressure relief channel, and the second return fluid channel are respectively connected to the pilot valve core mounting cavity.

[0009] The pilot valve core has a first shoulder for opening or closing the first pressure relief channel and a second shoulder for opening or closing the second pressure relief channel in opposite directions in the first direction. The pilot valve core extends movably into the pilot valve core mounting cavity in the direction of the main valve port in the first direction, so that the pilot valve core has a stable state where the main valve core position is stable and a non-stable state where the main valve core position is adjusted.

[0010] Optionally, in the stable state, the first shoulder closes the first pressure relief channel and the second shoulder closes the second pressure relief channel;

[0011] In the non-stationary state, the first shoulder opens the first pressure relief channel and the second shoulder closes the second pressure relief channel. The main valve core moves in the first direction relative to the pilot valve core in the direction from the second control chamber to the first control chamber, so that the pilot valve core in the non-stationary state is converted into the pilot valve core in the stationary state; or

[0012] In the non-stable state, the first shoulder closes the first pressure relief channel and the second shoulder opens the second pressure relief channel. The main valve core moves in the first direction relative to the pilot valve core in the direction from the first control chamber to the second control chamber, so that the pilot valve core in the non-stable state is converted into the pilot valve core in the stable state.

[0013] Optionally, the first control chamber, the return chamber, and the second control chamber are arranged sequentially in the first direction; and / or

[0014] The first shoulder and the second shoulder are arranged sequentially in the first direction.

[0015] Optionally, a first check valve is provided on the first control fluid channel; and / or

[0016] A second one-way valve is provided on the second control fluid channel.

[0017] Optionally, the pilot valve body is provided with a main control fluid channel, which is connected to the first control fluid channel and the second control fluid channel respectively. The main control fluid channel is provided with a third check valve, which is located upstream of the first control fluid channel and the second control fluid channel.

[0018] Optionally, the first control fluid channel is provided with a first throttling element; and / or

[0019] The second control fluid channel is equipped with a second throttling element.

[0020] Optionally, the pilot valve body has a first process port on its outer peripheral surface that communicates with the first control fluid channel, and the first process port has a removable first plug; and / or

[0021] The pilot valve body has a second process port on its outer peripheral surface that communicates with the second control fluid channel, and a removable second plug is provided in the second process port.

[0022] Optionally, the pilot valve body includes:

[0023] ontology;

[0024] An end cap is disposed on the side of the body away from the main valve port in the first direction. The end cap has an end cap hole that extends through in the first direction, through which the main valve core and the pilot valve core can pass.

[0025] Optionally, a first sealing groove is provided on the side of the end cap that abuts against the body and / or on the side of the body that abuts against the end cap, and a first sealing element is provided in the first sealing groove; and / or

[0026] A second sealing groove is provided on the inner wall surface of the end cap hole and / or on the outer peripheral surface of the main valve core that abuts against the inner wall surface of the end cap hole, and a second sealing element is provided in the second sealing groove.

[0027] Optionally, multiple first pressure relief channels are provided, and the multiple first pressure relief channels are arranged at circumferential intervals along the pilot valve body; and / or

[0028] The second pressure relief channel is provided in multiple forms, and the multiple second pressure relief channels are arranged at intervals along the circumference of the pilot valve body; and / or

[0029] The second return channel is provided in multiple ways, and the multiple second return channels are arranged at intervals along the circumference of the pilot valve body.

[0030] Optionally, the first shoulder extends along the first direction, and the first shoulder has a first surface and a second surface disposed opposite to each other in the first direction, the first shoulder closing the first pressure relief channel, the first pressure relief channel being spaced apart from the first surface and the second surface respectively in the first direction; and / or

[0031] The second shoulder extends along the first direction and has a third surface and a fourth surface that are disposed opposite to each other in the first direction. The second shoulder closes the second pressure relief channel, which is spaced apart from the third surface and the fourth surface in the first direction.

[0032] Optionally, both the first shoulder and the second shoulder are columnar, and the columnar first shoulder and the second shoulder respectively cooperate with the inner peripheral surface of the main valve core to define a first cavity, a second cavity and a third cavity. At least one of the first cavity, the second cavity and the third cavity is connected to the return cavity through the second return channel. The first cavity is adjacent to the first shoulder and away from the second shoulder, the second cavity is located between the first shoulder and the second shoulder, and the third cavity is away from the first shoulder and adjacent to the second shoulder.

[0033] Optionally, the first shoulder is provided with a first leakage channel, and the first cavity and the second cavity are connected through the first leakage channel; and / or

[0034] The second shoulder is provided with a second leakage channel, and the second cavity and the third cavity are connected through the second leakage channel.

[0035] Optionally, the pilot valve body is provided with a third leakage channel, through which the first chamber and the second chamber are connected; and / or

[0036] The pilot valve body is provided with a fourth leakage channel, and the second chamber and the third chamber are connected through the fourth leakage channel.

[0037] Optionally, the cartridge valve further includes a first spacer, a second spacer, a third spacer, and a fourth spacer located between the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core, wherein the first control chamber, the return chamber, and the second control chamber are defined between adjacent portions of the first spacer, the second spacer, the third spacer, and the fourth spacer;

[0038] The first control cavity and the second control cavity are adjacent. One of the first, second, third, and fourth interval portions, located between the first and second control cavities, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. The remaining three of the first, second, third, and fourth interval portions are disposed on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core, and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core; or

[0039] The first control cavity and the second control cavity are adjacent. One of the first, second, third, and fourth interval portions, adjacent to the first control cavity and distant from the second control cavity, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. Another of the first, second, third, and fourth interval portions, distant from the first control cavity and adjacent to the second control cavity, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. The remaining two of the first, second, third, and fourth interval portions are disposed on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core, and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core; or

[0040] The return fluid chamber is located between the first control chamber and the second control chamber. Two of the first, second, third, and fourth intervals, which are adjacent to or far from the return fluid chamber, are provided on the outer peripheral surface of the main valve core and abut against the inner peripheral surface of the pilot valve body. The other two of the first, second, third, and fourth intervals are provided on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core.

[0041] Optionally, the first interval, the second interval, the third interval, and the fourth interval are all annular blocks.

[0042] Optionally, at least one of the first interval portion, the second interval portion, the third interval portion, and the fourth interval portion is provided as at least two, so as to define at least one of the first control cavity, the second control cavity, and the return fluid cavity as at least two.

[0043] Optionally, the interval portion disposed in the first interval portion, the second interval portion, the third interval portion, and the fourth interval portion and disposed on the outer peripheral surface of the main valve core is the main valve core interval portion. A third sealing groove is provided on the side of the main valve core interval portion that abuts against the inner peripheral surface of the pilot valve body and / or on the abutting point of the inner peripheral surface of the pilot valve body that abuts against the main valve core interval portion. A third sealing element is provided in the third sealing groove.

[0044] The remaining intervals among the first interval, the second interval, the third interval, and the fourth interval are pilot valve body intervals. A fourth sealing groove is provided on the side of the pilot valve body interval that abuts against the outer peripheral surface of the main valve core and / or on the abutting point of the outer peripheral surface of the main valve core that abuts against the pilot valve body interval. A fourth sealing element is provided in the fourth sealing groove.

[0045] Optionally, the outer peripheral surface of the pilot valve core is provided with an external thread that is away from the main valve port in the first direction. The external thread extends along the first direction. The cartridge valve also includes a threaded sleeve provided on the pilot valve body. The threaded sleeve is provided with a threaded hole that is adapted to the external thread.

[0046] Optionally, the cartridge valve further includes a reset assembly, the reset assembly comprising:

[0047] A reset seat is provided on the side of the pilot valve body away from the main valve port;

[0048] An elastic part is disposed on the reset seat and connected to the main valve core to stop the flow of working fluid by controlling the main valve port of the main valve core.

[0049] Optionally, the elastic part is a spring in a compressed state.

[0050] Optionally, the cartridge valve further includes a pilot valve core actuation assembly, the pilot valve core actuation assembly comprising:

[0051] A stepper motor is located on the side of the pilot valve body away from the main valve port, and the output shaft of the stepper motor is connected to the pilot valve core.

[0052] Optionally, the cartridge valve further includes a main valve body, which has a working fluid port and a high-pressure fluid inlet. The main valve body is disposed on the pilot valve body and sleeved on the main valve port. The main valve body and the main valve port cooperate to define a high-pressure fluid channel and a working fluid channel. The high-pressure fluid channel can be connected to the working fluid channel. The high-pressure fluid channel is connected to the high-pressure fluid inlet, and the working fluid channel is connected to the working fluid port. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the stable state of the cartridge valve in an embodiment of the present invention.

[0054] Figure 2 This is a schematic diagram of the non-steady state of the cartridge valve in an embodiment of the present invention.

[0055] Reference numerals: 1000-Cartridge valve, 100-Pilot valve body, 100a-Body, 100b-End cap, 100c-End cap hole, 101-Main valve core mounting cavity, 102-First control fluid channel, 103-Second control fluid channel, 104-First return fluid channel, 105-Main control fluid channel, 106-Third check valve, 107-First throttling element, 108-Second throttling element, 109-First process port, 110-First plug, 111-Second process port, 112-Second plug, 113-First sealing groove, 114-First seal, 115-Second sealing groove, 116-Second seal, 117-Third leakage channel, 118-Fourth leakage channel, 119-Third sealing groove, 120-Third seal, 121-Fourth sealing groove, 122-Fourth seal;

[0056] 200-Main valve core, 201-Main valve port, 202-First control chamber, 203-Second control chamber, 204-Return chamber, 205-Pilot valve core mounting chamber, 205a-First chamber, 205b-Second chamber, 205c-Third chamber, 206-First pressure relief channel, 207-Second pressure relief channel, 208-Second return channel;

[0057] 300 - Pilot valve core, 301 - First shoulder, 302 - Second shoulder, 303 - External thread;

[0058] 401 - First interval section, 402 - Second interval section, 403 - Third interval section, 404 - Fourth interval section;

[0059] 500 - threaded sleeve, 501 - threaded hole;

[0060] 600 - Reset assembly, 601 - Reset base, 602 - Elastic part;

[0061] 700 - Pilot valve core drive assembly; 701 - Stepper motor;

[0062] 800 - Main valve body, 801 - High-pressure fluid passage, 802 - Working fluid passage;

[0063] A - Working fluid port, P - High-pressure fluid inlet, T - Control fluid return port; Detailed Implementation

[0064] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0065] The cartridge valve 1000 of the present invention will now be described with reference to the accompanying drawings. Figure 1 and Figure 2As shown, the cartridge valve 1000 of this embodiment includes a pilot valve body 100, a main valve core 200, and a pilot valve core 300.

[0066] The pilot valve body 100 has a main valve core mounting cavity 101 that extends through the first direction. The pilot valve body 100 is provided with a first control fluid channel 102, a second control fluid channel 103 and a first return fluid channel 104 at intervals.

[0067] The main valve core 200 is movably extended into the main valve core mounting cavity 101 in a first direction. The main valve core 200 has a main valve port 201 that controls the system flow rate. The main valve port 201 extends out of the main valve core mounting cavity 101 in the first direction. The main valve core 200 cooperates with the pilot valve body 100 to define a first control cavity 202 that communicates with the first control fluid channel 102, a second control cavity 203 that communicates with the second control fluid channel 103, and a return fluid cavity 204 that communicates with the first return fluid channel 104. The control chamber 202 and the second control chamber 203 are arranged opposite to each other in the first direction. The main valve core 200 has a pilot valve core mounting chamber 205 extending in the first direction. The main valve core 200 is provided with a first pressure relief channel 206 communicating with the first control chamber 202, a second pressure relief channel 207 communicating with the second control chamber 203, and a second return channel 208 communicating with the return liquid chamber 204. The first pressure relief channel 206, the second pressure relief channel 207, and the second return liquid channel 208 are respectively connected to the pilot valve core mounting chamber 205.

[0068] The pilot valve core 300 is provided with a first shoulder 301 for opening or closing the first pressure relief channel 206 and a second shoulder 302 for opening or closing the second pressure relief channel 207 in a first direction. The pilot valve core 300 is movably extended into the pilot valve core mounting cavity 205 in the first direction toward the main valve port 201, so that the pilot valve core 300 has a stable state where the main valve core position is stable and a non-stable state where the main valve core position is adjusted.

[0069] The cartridge valve 1000 of this embodiment of the invention adjusts the relative position of the pilot valve core 300 relative to the main valve core 200, thereby changing the pressure in the first control chamber 202 and the second control chamber 203, and further adjusting the relative position of the main valve core 200 relative to the pilot valve body 100, to achieve precise control of the main valve core 200. Simultaneously, during the adjustment process of the pilot valve core 300 and the main valve core 200, precise control of the main valve core 200 can be achieved by controlling the pilot valve core 300, that is, precise control of the displacement of the main valve core 200, thereby achieving stepless regulation of the system flow rate.

[0070] The following describes some specific embodiments of the cartridge valve 1000 of the present invention. For ease of description, Figure 1 The left and right directions are the first directions.

[0071] The cartridge valve 1000 of the present invention is described below with reference to the accompanying drawings.

[0072] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the main valve core mounting cavity 101 of the pilot valve body 100 can accommodate the main valve core 200, and the main valve core mounting cavity 101 extends through the pilot valve body 100 along a first direction. The pilot valve body 100 includes a body 100a and an end cap 100b, which can be installed at either the left or right end of the body 100a. For example, if the main valve port 201 of the main valve core 200 is located at the right end of the body 100a, the end cap 100b can be installed at the left end of the body 100a. Furthermore, the end cap 100b has an end cap hole 100c extending through in the first direction, through which the main valve core 200 can be installed within the main valve core mounting cavity 101.

[0073] In addition, the pilot valve body 100 is provided with a first control fluid channel 102, a second control fluid channel 103 and a first return fluid channel 104 at intervals.

[0074] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a first sealing groove 113 is provided at the position where the end cap 100b and the body 100b abut against each other, and a first sealing element 114 is installed in the first sealing groove 113. Optionally, the first sealing groove 113 can be formed separately on the end cap 100b. Optionally, the first sealing groove 113 can be formed separately on the body 100b. Preferably, the first sealing grooves 113 can be formed simultaneously on the end cap 100b and the body 100b, and the first sealing grooves 113 on the end cap 100b and the body 100b can cooperate with each other to accommodate the first sealing element 114. Specifically, the first sealing element 114 is installed in the first sealing groove 113, which can improve the sealing performance between the end cap 100b and the body 100b and prevent control fluid leakage.

[0075] In some specific embodiments, such as Figure 1 and Figure 2As shown, a second sealing groove 115 is provided at the position where the end cap hole 100c and the main valve core 200 abut against each other, and a second sealing element 116 is installed in the second sealing groove 115. Optionally, the second sealing groove 115 can be formed separately on the end cap hole 100c. Optionally, the second sealing groove 115 can also be formed separately on the main valve core 200. Specifically, the second sealing groove 115 can be formed simultaneously on the end cap hole 100c and the main valve core 200, and the second sealing groove 115 on the end cap 100b and the second sealing groove 115 on the main valve core 200 can cooperate with each other to accommodate the second sealing element 116. Specifically, the second sealing element 116 is installed in the second sealing groove 115, which can improve the sealing performance between the end cap 100b and the main valve core 200 and prevent control fluid leakage.

[0076] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the pilot valve body 100 is provided with a main control fluid channel 105, which is connected to the high-pressure fluid inlet P, the first control fluid channel 102, and the second control fluid channel 103. Control fluid flows into the first control chamber 202 sequentially through the high-pressure fluid inlet P, the main control fluid channel 105, and the first control fluid channel 102. Control fluid flows into the second control chamber 203 sequentially through the high-pressure fluid inlet P, the main control fluid channel 105, and the second control fluid channel 103.

[0077] A third check valve 106 is installed in the main control fluid channel 105. The third check valve 106 is located upstream of the first control fluid channel 102 and the second control fluid channel 103.

[0078] Specifically, such as Figure 1 and Figure 2 As shown, high-pressure liquid flows into the main control liquid channel 105 from the high-pressure liquid inlet P. The third check valve 106 in the main control liquid channel 105 can prevent the control liquid flowing into the main control liquid channel 105 from the high-pressure liquid inlet P from flowing back to the high-pressure liquid inlet P, thereby preventing the change in the liquid flow rate in the first control chamber 202 and the second control chamber 203 under stable conditions from causing the position of the main valve core to change.

[0079] In some specific embodiments, a first check valve may be installed in the first control fluid channel 102. The first check valve in the first control fluid channel 102 can control the flow direction of the control fluid in the first control fluid channel 102, preventing the control fluid in the first control fluid channel 102 from flowing back to the main control fluid channel 105. When the main valve core 200 is under load, it prevents the control fluid in the first control chamber 202 and the second control chamber 203 from flowing back to the main control fluid channel 105, avoids changes in the flow rate of the first control chamber 202 and the second control chamber 203, and prevents changes in the position of the main valve core 200.

[0080] In some specific embodiments, a second check valve can be installed in the second control fluid channel 103. The second check valve in the second control fluid channel 103 can control the flow direction of the control fluid in the second control fluid channel 103, preventing the control fluid in the second control fluid channel 103 from flowing back to the main control fluid channel 105. The principle of the second check valve is the same as that of the first check valve, and will not be described again here.

[0081] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a first throttling element 107 can be installed in the first control fluid channel 102, which can play a certain role in reducing pressure surges. Specifically, when the first pressure relief channel 206 is opened, the first throttling element 107 can limit the flow and reduce the pressure in the first control fluid channel 102 (acting as a damper), isolating the pressure influence between the first control fluid channel 102 and the main control fluid channel 105. That is, the pressure changes in the first control chamber 202 will not affect the pressure in the main control fluid channel 105.

[0082] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a second throttling element 108 can be installed in the second control fluid channel 103. The principle of the second throttling element 108 is the same as that of the first throttling element 107, and will not be described again here.

[0083] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a first process port 109 is provided on the outer peripheral surface of the pilot valve body 100. The first process port 109 is connected to the first control fluid channel 102, and the first plug 110 is detachably installed in the first process port 109.

[0084] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a second process port 111 is provided on the outer peripheral surface of the pilot valve body 100. The second process port 111 is connected to the second control fluid channel 103, and the second plug 112 is detachably installed in the second process port 111.

[0085] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the pilot valve core mounting cavity 205 of the main valve core 200 extends along a first direction, and the pilot valve core mounting cavity 205 can be used to mount the pilot valve core 300. The main valve core 200 is provided with a first pressure relief channel 206, which communicates with the first control cavity 202. The first control cavity 202 can discharge control fluid through the first pressure relief channel 206, thereby changing the pressure of the first control cavity 202. Similarly, the principle of the second pressure relief channel 207 is the same as that of the first pressure relief channel 206, and will not be described further here.

[0086] The control fluid discharged from the first pressure relief channel 206 and the second pressure relief channel 207 can flow into the return fluid chamber 204 through the second return fluid channel 208 of the main valve core 200. Then, the control fluid in the return fluid chamber 204 can flow out from the first return fluid channel 104 to discharge the control fluid in the return fluid chamber 204 from the cartridge valve 1000. The first pressure relief channel 206, the second pressure relief channel 207, and the second return fluid channel 208 are all connected to the pilot valve core mounting cavity 205.

[0087] In some specific embodiments, such as Figure 1 and Figure 2 As shown, multiple first pressure relief channels 206 can be provided on the main valve core 200. These multiple first pressure relief channels 206 can more stably discharge the control fluid from the first control chamber 202. Preferably, the multiple first pressure relief channels 206 are arranged circumferentially around the pilot valve body to reduce the radial unbalanced force on the pilot valve core 300. Specifically, the fluid in the first pressure relief channels 206 impacts the pilot main valve core 300. To ensure balanced fluid impact on the pilot main valve core 300, multiple first pressure relief channels 206 are arranged circumferentially symmetrically. When the radial force on the pilot main valve core 300 is balanced, the frictional force it experiences during movement is smaller, i.e., the frictional force on the pilot main valve core 300 can be reduced.

[0088] Similarly, multiple second pressure relief channels 207 and multiple second return channels 208 can be provided on the main valve core 200. The principle of the second pressure relief channel 207 is the same as that of the first pressure relief channel 206, and the principle of the second return channel 208 is the same as that of the first pressure relief channel 206. These will not be elaborated here.

[0089] It should be noted that the multiple first pressure relief channels 206 and multiple second pressure relief channels 207 are discretely distributed, which can avoid excessive flow and pressure gain, thereby enabling better control of the pilot main valve core 300 and improving the accuracy of the main valve core 200.

[0090] In some specific embodiments, the main valve core 200 has a main valve port 201 that controls the system flow rate, the main valve port 201 extending out of the main valve core mounting cavity 101 in a first direction. For example, as Figure 1 and Figure 2 As shown, the main valve port 201 can extend from the right side of the main valve port 201.

[0091] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the main valve core 200 can be installed in the main valve core mounting cavity 101. A first control cavity 202, a second control cavity 203, and a return fluid cavity 204 are defined between the main valve core 200 and the pilot valve body 100, arranged at intervals. The first control cavity 202 is connected to a first control fluid channel 102, allowing control fluid to enter the first control cavity 202 and thus creating a certain pressure within it. Similarly, the control fluid can create a certain pressure within the second control cavity 203. The first control cavity 202 and the second control cavity 203 are arranged opposite each other in a first direction, that is, they are arranged opposite each other in a left-right direction. When the pressure in the first control cavity 202 and the pressure in the second control cavity 203 act simultaneously on the main valve core 200, if the pressures are equal, it can be ensured that the main valve core 200 will not move relative to the pilot valve body 100. If the pressures of the two are different, the different pressures can push the main valve core 200 to move relative to the pilot valve body 100, thereby controlling the position of the main valve port 201.

[0092] The return chamber 204 between the main valve core 200 and the pilot valve body 100 can receive control fluid discharged from the first control chamber 202 and the second control chamber 203. In addition, the return chamber 204 is connected to the first return channel 104, and the control fluid in the return chamber 204 can be discharged from the cartridge valve 1000 through the first return channel 104.

[0093] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the first control chamber 202, the second control chamber 203, and the return chamber 204 are arranged sequentially in the first direction. Specifically, the first control chamber 202, the second control chamber 203, and the return chamber 204 are arranged sequentially in the left-right direction.

[0094] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the pilot valve core 300 is installed in the pilot valve core mounting cavity 205. The pilot valve core 300 can move relative to the pilot valve body 100 and the pilot valve core 300, so that the first shoulder 301 of the pilot valve core 300 can open or close the first pressure relief channel 206, thereby changing the pressure in the first control cavity 202.

[0095] When the pilot valve core 300 is in a non-stationary state: the first shoulder 301 opens the first pressure relief channel 206 and the second shoulder 302 closes the second pressure relief channel 207. The pressure in the first control chamber 202 is less than the pressure in the second control chamber 203. The pressure in the second control chamber 203 can push the main valve core 200 to move. That is, the main valve core 200 moves in the first direction relative to the pilot valve core 300 from the second control chamber 203 to the first control chamber 202, until the first shoulder 301 closes the first pressure relief channel 206 and the second shoulder 302 closes the second pressure relief channel 207, so that the non-stationary pilot valve core 300 is converted into a stationary pilot valve core 300. Optionally, the first shoulder 301 closes the first pressure relief channel 206 and the second shoulder 302 opens the second pressure relief channel 207. The principle of this is the same as described above and will not be repeated here.

[0096] When the pilot valve core 300 moves from the first control chamber 203 to the second control chamber 202 or from the second control chamber 203 to the first control chamber 202, the first shoulder 301 can open or close the first pressure relief passage 206, thereby changing the pressure in the first control chamber 202. Similarly, the second shoulder 302 changes the pressure in the second control chamber 203 by opening or closing the second pressure relief passage 207.

[0097] Specifically, when the pressure in the first control chamber 202 and the pressure in the second control chamber 203 change, that is, when the balance between the pressure in the first control chamber 202 and the pressure in the second control chamber 203 is disrupted, the main valve core 200 can move relative to the pilot valve body 100 and the pilot valve core 300 under the simultaneous action of the pressure in the first control chamber 202 and the pressure in the second control chamber 203, thereby adjusting the position of the main valve port 201 to regulate the flow rate of the working fluid.

[0098] Non-steady state of pilot valve core 300: First shoulder 301 closes first pressure relief channel 206 and second shoulder 302 closes second pressure relief channel 207. The pressure in first control chamber 202 and pressure in second control chamber 203 remain balanced. The relative position between main valve core 200, pilot valve body 100 and pilot valve core 300 remains unchanged. That is, the position of main valve port 201 remains unchanged, so that the flow rate of working fluid can be fixed.

[0099] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the first shoulder 301 and the second shoulder 302 are arranged sequentially in the first direction (left-right direction).

[0100] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the first shoulder 302 extends along a first direction and has a first surface 302a and a second surface 302b disposed opposite to each other in the first direction. For example, the first surface 302a is located on the left side of the first shoulder 302, and the second surface 302b is located on the right side of the first shoulder 302. When the first shoulder 302 closes the first pressure relief channel 206, the first surface 302a is located on the left side of the first pressure relief channel 206, and there is a certain distance between the first surface 302a and the first pressure relief channel 206. The second surface 302b is located on the right side of the first pressure relief channel 206, and there is a certain distance between the second surface 302b and the first pressure relief channel 206. This can improve the strength of the first shoulder 302 in closing the first pressure relief channel 206, thereby improving the sealing performance between the first shoulder 302 and the first pressure relief channel 206, and effectively preventing the control fluid in the first pressure relief channel 206 from leaking out from between the first shoulder 302 and the first pressure relief channel 206.

[0101] Similarly, the principle of the second shoulder 302 is the same as that of the first shoulder 301, and will not be repeated here.

[0102] In some specific embodiments, such as Figure 1 and Figure 2 As shown, both the first shoulder 301 and the second shoulder 302 are cylindrical.

[0103] Specifically, taking the first shoulder 301 and the second shoulder 302 of the cylinder as examples, the first shoulder 301 and the second shoulder 302 can divide the pilot valve core mounting cavity 205 into a first cavity 205a, a second cavity 205b, and a third cavity 205c. At least one of the first cavity 205a, the second cavity 205b, and the third cavity 205c is connected to the return cavity 204 through the second return channel 208. That is to say, the second return channel 208 can be connected to one of the first cavity 205a, the second cavity 205b, and the third cavity 205c individually, or it can be connected to the first cavity 205a, the second cavity 205b, and the third cavity 205c simultaneously.

[0104] The control fluid flowing out from the first pressure relief channel 206 and the second pressure relief channel 207 can temporarily flow into the first chamber 205a, the second chamber 205b and the third chamber 205c. Then the control fluid is discharged from the first chamber 205a, the second chamber 205b and the third chamber 205c in a timely manner through the second return channel 208, so as to avoid excessive pressure in the first chamber 205a, the second chamber 205b and the third chamber 205c from affecting the pilot valve core 300 to regulate the main valve core 200.

[0105] Furthermore, the first cavity 205a is adjacent to the first shoulder 301 and far from the second shoulder 302, the second cavity 205b is located between the first shoulder 301 and the second shoulder 302, and the third cavity 205c is far from the first shoulder 301 and adjacent to the second shoulder 302. For example, if the first shoulder 301 is located on the left side of the pilot valve core mounting cavity 205 and the second shoulder 302 is located on the right side of the pilot valve core mounting cavity 205, then the first cavity 205a, the second cavity 205b, and the third cavity 205c are arranged sequentially from left to right. In some specific embodiments, such as... Figure 1 and Figure 2 As shown, a first leakage channel is provided on the first shoulder 301. The first chamber 205a and the second chamber 205b can be connected through the first leakage channel, which can balance the pressure in the first chamber 205a and the second chamber 205b. This can effectively prevent the pressure in the first chamber 205a and the second chamber 205b from being different, thereby affecting the pilot valve core 300's regulation of the main valve core 200.

[0106] In some specific embodiments, such as Figure 1 and Figure 2 As shown, a second leakage channel is provided on the second shoulder 302, through which the second cavity 205b and the third cavity 205c can be connected. The principle of the second leakage channel is the same as that of the first leakage channel, and will not be described again here.

[0107] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the pilot valve body 100 is provided with a third leakage channel 117, through which the first chamber 205a and the second chamber 205b can be connected. The principle of the third leakage channel 117 is the same as that of the first leakage channel, and will not be described again here.

[0108] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the pilot valve body 100 is provided with a fourth leakage channel 118, through which the second chamber 205b and the third chamber 205c can be connected. The principle of the fourth leakage channel 118 is the same as that of the first leakage channel, and will not be described again here.

[0109] In some specific embodiments, such as Figure 1 and Figure 2As shown, the cartridge valve 1000 also includes a first spacer 401, a second spacer 402, a third spacer 403, and a fourth spacer 404 located between the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200. Adjacent spaces among the first spacer 401, second spacer 402, third spacer 403, and fourth spacer 404 define a first control chamber 202, a return chamber 204, and a second control chamber 203. For example, the cooperation between the first spacer 401 and the second spacer 402 can define either the first control chamber 202, the return chamber 204, or the second control chamber 203. The first spacer 401 can also cooperate with the third spacer 403 and the fourth spacer 404. Furthermore, there are various possible combinations of the first spacer 401, second spacer 402, third spacer 403, and fourth spacer 404, which will not be described in detail here.

[0110] In some specific embodiments, the first control cavity 202 and the second control cavity 203 are adjacent to each other. One of the first interval portion 401, the second interval portion 402, the third interval portion 403 and the fourth interval portion 404 located between the first control cavity 202 and the second control cavity 203 is provided on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. The other three of the first interval portion 401, the second interval portion 402, the third interval portion 403 and the fourth interval portion 404 are provided on one of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200 and abut against the other of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200.

[0111] Specifically, such as Figure 1 and Figure 2As shown, when the first control chamber 202 and the second control chamber 203 are adjacent to each other, the spacer portion located between the first control chamber 202 and the second control chamber 203 can be provided on the outer peripheral surface of the main valve core 200, and this spacer portion abuts against the inner peripheral surface of the pilot valve body 100. That is, the pressure in the first control chamber 202 can act on this spacer portion, and at the same time, the pressure in the second control chamber 203 can also act on this spacer portion, that is, it can push the spacer portion to move in the left and right direction, and the spacer portion can drive the main valve core 200 to move left and right, thereby realizing the movement of the main valve core 200. It should be noted that the spacer portion can be any one of the first spacer portion 401, the second spacer portion 402, the third spacer portion 403, and the fourth spacer portion 404. In addition, the assembly method between the other three spacer portions of the first spacer portion 401, the second spacer portion 402, the third spacer portion 403, and the fourth spacer portion 404 and the main valve core 200 and the pilot valve body 100 is not limited. For example, the first spacer 401 is the spacer described above, and the second spacer 402 will be described. The assembly method of the second spacer 402 can be the same as that of the first spacer 401. Alternatively, the second spacer 402 can be provided on the inner circumferential surface of the pilot valve body 100, and the spacer abuts against the outer circumferential surface of the main valve core 200.

[0112] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the first control cavity 202 and the second control cavity 203 are adjacent to each other. One of the first interval portion 401, the second interval portion 402, the third interval portion 403, and the fourth interval portion 404, which is adjacent to the first control cavity 202 and away from the second control cavity 203, is disposed on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. One of the first interval portion 401, the second interval portion 402, the third interval portion 403, and the fourth interval portion 404, which is away from the first control cavity 202 and away from the second control cavity 203, is disposed on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. One of the control chambers 202 and the adjacent second control chamber 203 is located on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. The other two of the first spacer 401, the second spacer 402, the third spacer 403 and the fourth spacer 404 are located on one of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200 and abut against the other of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200.

[0113] Specifically, when the first control chamber 202 and the second control chamber 203 are adjacent, the first control chamber 202 is positioned to the left of the cartridge valve 1000, and the second control chamber 203 is positioned to the right of the cartridge valve 1000. A left spacer portion is located to the left of the first control chamber 202, and this left spacer portion is located on the outer peripheral surface of the main valve core 200, abutting against the inner peripheral surface of the pilot valve body 100. Simultaneously, a right spacer portion is located to the right of the second control chamber 203, and this right spacer portion is located on the outer peripheral surface of the main valve core 200, abutting against the inner peripheral surface of the pilot valve body 100. That is, the left and right spacer portions are assembled in the same way. When the pressure in the first control chamber 202 acts on the left spacer portion and the pressure in the second control chamber 203 acts on the right spacer portion, the force between the left and right spacer portions can indirectly push the main valve core 200 to move left and right, thereby realizing the movement of the main valve core 200. It should be noted that the left and right partitions can be any two of the first partition 401, the second partition 402, the third partition 403, and the fourth partition 404. Furthermore, the assembly relationship between the remaining two partitions of the first partition 401, the second partition 402, the third partition 403, and the fourth partition 404 and the main valve core 200 and the pilot valve body 100 is not limited; please refer to the above description for details.

[0114] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the return chamber 204 is located between the first control chamber 202 and the second control chamber 203. Two of the first interval portion 401, the second interval portion 402, the third interval portion 403 and the fourth interval portion 404, which are adjacent to or far from the return chamber 204, are provided on the outer peripheral surface of the main valve core 200 and abut against the inner peripheral surface of the pilot valve body 100. The other two of the first interval portion 401, the second interval portion 402, the third interval portion 403 and the fourth interval portion 404 are provided on one of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200 and abut against the other of the inner peripheral surface of the pilot valve body 100 and the outer peripheral surface of the main valve core 200.

[0115] Specifically, when the return chamber 204 is located between the first control chamber 202 and the second control chamber 203, the first control chamber 202 is positioned to the left of the cartridge valve 1000, and the second control chamber 203 is positioned to the right of the cartridge valve 1000. A left spacer located to the left of the first control chamber 202 is mounted on the outer circumferential surface of the main valve core 200 and abuts against the inner circumferential surface of the pilot valve body 100. Simultaneously, a right spacer located to the right of the second control chamber 203 is mounted on the outer circumferential surface of the main valve core 200 and abuts against the inner circumferential surface of the pilot valve body 100. When the pressure in the first control chamber 202 acts on the left spacer and the pressure in the second control chamber 203 acts on the right spacer, the pressure between the left and right spacers can indirectly push the main valve core 200 to move left and right, thereby realizing the movement of the main valve core 200. Optionally, a right partition located on the right side of the first control chamber 202 is mounted on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. Simultaneously, a left partition located on the left side of the second control chamber 203 is mounted on the outer peripheral surface of the main valve core 200 and abuts against the inner peripheral surface of the pilot valve body 100. It should be noted that the left and right partitions can be any two of the first partition 401, second partition 402, third partition 403, and fourth partition 404. Furthermore, the assembly relationship between the remaining two partitions of the first partition 401, second partition 402, third partition 403, and fourth partition 404 and the main valve core 200 and pilot valve body 100 is not limited; please refer to the above description for specific details. In some specific embodiments, such as... Figure 1 and Figure 2 As shown, the first interval 401, the second interval 402, the third interval 403 and the fourth interval 404 are all annular blocks. The first interval 401, the second interval 402, the third interval 403 and the fourth interval 404 of the annular blocks can form an annular return chamber 204, a first control chamber 202 and a second control chamber 20.

[0116] In some specific embodiments, such as Figure 1 and Figure 2 As shown, at least one of the first interval portion 401, the second interval portion 402, the third interval portion 403 and the fourth interval portion 404 is provided as at least two, so as to define at least one of the first control chamber, the second control chamber and the return chamber as at least two.

[0117] Specifically, there can be multiple first intervals 401, multiple second intervals 402, multiple third intervals 403, and multiple fourth intervals 404. In addition, the multiple first intervals 401, second intervals 402, third intervals 403, and fourth intervals 404 can form multiple return chambers 204, multiple first control chambers 202, and multiple second control chambers 20.

[0118] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the main valve core spacer is a spacer located on the outer peripheral surface of the main valve core 200, which is situated among the first spacer 401, the second spacer 402, the third spacer 403, and the fourth spacer 404. A third sealing groove 119 is provided on the side of the main valve core spacer that abuts against the inner peripheral surface of the pilot valve body 100 and / or on the contact point between the inner peripheral surface of the pilot valve body 100 and the main valve core spacer. A third sealing element 120 is provided within the third sealing groove 119. The principle of the third sealing element 120 is the same as that of the first sealing element 114, and will not be described again here.

[0119] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the remaining intervals in the first interval 401, second interval 402, third interval 403, and fourth interval 404 are pilot valve body intervals. A fourth sealing groove 121 is provided on the side of the pilot valve body interval that abuts against the outer peripheral surface of the main valve core 200 and / or on the contact point between the outer peripheral surface of the main valve core 200 and the pilot valve body interval. A fourth sealing element 122 is provided in the fourth sealing groove. The principle of the fourth sealing element 122 is the same as that of the first sealing element 114, and will not be described again here.

[0120] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the outer circumferential surface of the pilot valve core 300 is provided with an external thread 303 away from the main valve port 201 in a first direction. The external thread 303 extends along the first direction. The cartridge valve 1000 also includes a threaded sleeve 500 provided on the pilot valve body 100. The threaded sleeve 500 is provided with a threaded hole 501 that is adapted to the external thread 303. It can control the start and stop of the pilot valve core 300, ensuring that the start and stop of the pilot valve core 300 is smooth, thereby accurately controlling the start and stop of the main valve core 200, ensuring that the start and stop of the main valve core 200 is smooth, and reducing the impact of the flow and pressure of the working fluid.

[0121] In some specific embodiments, such as Figure 1 and Figure 2As shown, the cartridge valve 1000 also includes a reset assembly 600, which includes a reset seat 601 and an elastic part 602. The reset seat 601 is located on the side of the pilot valve body 100 away from the main valve port 201. For example, the reset seat 601 is located on the left side of the pilot valve body 100. The elastic part 602 is disposed on the reset seat 601 and is connected to the main valve core 200. The elastic part 602 always acts on the main valve core 200 to ensure the reset position of the main valve core 200.

[0122] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the elastic part 602 is a spring in a compressed state, which can ensure that the main valve core 200 is always subjected to force.

[0123] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the cartridge valve 1000 also includes a pilot valve core drive assembly 700, which includes a stepper motor 701. The stepper motor 701 is located on the side of the pilot valve body 100 away from the main valve port 201, and the output shaft of the stepper motor 701 is connected to the pilot valve core 300.

[0124] Specifically, the output shaft of the stepper motor 701 is connected to the pilot valve core 300, driving the pilot valve core 300 to move, thereby controlling the main valve core 200 to regulate the flow rate of the working fluid.

[0125] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the stepper motor 701 can be connected to one end of the pilot valve core 300 via a keyway connection, and the threaded sleeve 500 can be installed between the stepper motor 701 and the pilot valve body 100.

[0126] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the cartridge valve 1000 also includes a main valve body 800, which has a working fluid port A and a high-pressure fluid inlet P. The main valve body 800 is mounted on the pilot valve body 100 and is sleeved on the main valve port 201. The main valve body 800 and the main valve port 201 cooperate to define the high-pressure fluid channel 801 and the working fluid channel 802. The high-pressure fluid channel 801 can be connected to the working fluid channel 802. The high-pressure fluid channel 801 is connected to the high-pressure fluid inlet P, and the working fluid channel 802 is connected to the working fluid port A.

[0127] Working principle:

[0128] The pilot valve core 300 is in a stable state. For example... Figure 1As shown, the first shoulder 301 of the pilot valve core 300 closes the first pressure relief channel 206, and at the same time, the second shoulder 302 of the pilot valve core 300 closes the second pressure relief channel 207. The pressure in the first control chamber 202 is in a certain proportion to the pressure in the second control chamber 203, which can ensure that the position of the main valve core 200 will not change. That is, the opening between the high-pressure liquid channel 801 and the working liquid channel 802 remains unchanged, and the flow rate of the working liquid flowing from the high-pressure liquid channel 801 into the working liquid channel 802 remains unchanged.

[0129] The pilot valve spool 300 is in a non-steady state. For example... Figure 2 As shown, when the stepper motor 701 drives the pilot valve core 300 to move to the left relative to the main valve core 200, the first shoulder 301 of the pilot valve core 300 gradually opens the first pressure relief channel 206, the pressure in the first control chamber 202 continuously decreases, and the pressure in the second control chamber 203 remains unchanged. Therefore, the pressure balance between the first control chamber 202 and the second control chamber 203 changes. Under the action of the pressure difference, the pressure in the second control chamber 203 can push the main valve core 300, causing the main valve core 300 to move to the left relative to the pilot valve body 100 until the first shoulder 301 closes the first pressure relief channel 206 again. The pressure in the first control chamber 202 and the pressure in the second control chamber 203 are balanced again, and the main valve core 300 stops moving, thereby adjusting the position of the main valve port 201, changing the opening between the high-pressure liquid channel 801 and the working liquid channel 802, and thus changing the flow rate of the working liquid flowing from the high-pressure liquid channel 801 into the working liquid channel 802.

[0130] The cartridge valve 1000 of this invention can achieve the following effects:

[0131] 1. The pilot valve core 300 is driven by a stepper motor or a servo motor to achieve displacement of the main valve core 200 and high flow control of the main valve port 201. The liquid pressure on the pilot valve core is low, therefore the main load on the pilot valve is friction, effectively reducing the power consumption of the stepper motor or servo motor.

[0132] 2. The cartridge valve 1000 adopts a nested pilot valve core structure, which simplifies the structure of the cartridge valve 1000 and significantly reduces its weight and volume. At the same time, the nested structure reduces the number of pipe connections in the pilot control chamber, thereby avoiding external leakage of the cartridge valve 1000.

[0133] 3. The pilot valve core 300 adopts a non-full-circumference opening throttling window, that is, it adopts a discrete circular throttling window form, which can avoid excessive flow and pressure gain, and can more accurately control the displacement of the pilot valve core and the area of ​​the throttling window, thereby improving the regulation resolution.

[0134] 4. The pilot valve core 300 adopts a threaded connection structure for movement, which makes the start and stop of the pilot valve core 300 more stable, and further makes the control of the main valve core 200 more stable, reducing the impact of flow and pressure.

[0135] 5. The main valve core 200 can remain at any opening degree, and its position will not be affected by pressure fluctuations at the working fluid port A. Furthermore, the opening and closing characteristics of the main valve core 200 primarily depend on the pressure of the control fluid, and are independent of the pressure at the working fluid port A.

[0136] 7. The main valve core 200 proposed in this invention has a hydraulically balanced structure. Furthermore, the machining difficulty of the spool-type pilot valve core is significantly reduced compared to that of the spiral groove-type pilot valve core.

[0137] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0138] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0139] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0140] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0141] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0142] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A cartridge valve, characterized in that, include: The pilot valve body has a main valve core mounting cavity that extends along a first direction. The pilot valve body is provided with a first control fluid channel, a second control fluid channel and a first return fluid channel at intervals. The main valve core is movably extended into the main valve core mounting cavity in the first direction. The main valve core has a main valve port that controls the flow rate of the system. The main valve port extends out of the main valve core mounting cavity in the first direction. The main valve core cooperates with the pilot valve body to define a first control cavity that communicates with the first control fluid channel, a second control cavity that communicates with the second control fluid channel, and a return fluid cavity that communicates with the first return fluid channel. The first control cavity and the second control cavity are arranged opposite to each other in the first direction. The main valve core has a pilot valve core mounting cavity that extends along the first direction. The main valve core is provided with a first pressure relief channel that communicates with the first control cavity, a second pressure relief channel that communicates with the second control cavity, and a second return fluid channel that communicates with the return fluid cavity. The first pressure relief channel, the second pressure relief channel, and the second return fluid channel are respectively connected to the pilot valve core mounting cavity. The pilot valve core has a first shoulder for opening or closing the first pressure relief channel and a second shoulder for opening or closing the second pressure relief channel in opposite directions in the first direction. The pilot valve core extends movably into the pilot valve core mounting cavity in the direction of the main valve port in the first direction, so that the pilot valve core has a stable state where the main valve core position is stable and a non-stable state where the main valve core position is adjusted.

2. The cartridge valve according to claim 1, characterized in that, In the stable state, the first shoulder closes the first pressure relief channel and the second shoulder closes the second pressure relief channel; In the non-stable state, the first shoulder opens the first pressure relief channel and the second shoulder closes the second pressure relief channel. The main valve core moves in the first direction relative to the pilot valve core in the direction from the second control chamber to the first control chamber, so that the pilot valve core in the non-stable state is converted into the pilot valve core in the stable state. or In the non-stable state, the first shoulder closes the first pressure relief channel and the second shoulder opens the second pressure relief channel. The main valve core moves in the first direction relative to the pilot valve core in the direction from the first control chamber to the second control chamber, so that the pilot valve core in the non-stable state is converted into the pilot valve core in the stable state.

3. The cartridge valve according to claim 1, characterized in that, The first control chamber, the return chamber, and the second control chamber are arranged sequentially in the first direction; and / or The first shoulder and the second shoulder are arranged sequentially in the first direction.

4. The cartridge valve according to claim 1, characterized in that, The first control fluid channel is provided with a first check valve; and / or A second one-way valve is provided on the second control fluid channel.

5. The cartridge valve according to claim 1, characterized in that, The pilot valve body is provided with a main control fluid channel, which is connected to the first control fluid channel and the second control fluid channel respectively. The main control fluid channel is provided with a third check valve, which is located upstream of the first control fluid channel and the second control fluid channel.

6. The cartridge valve according to claim 1, characterized in that, The first control fluid channel is provided with a first throttling element; and / or The second control fluid channel is equipped with a second throttling element.

7. The cartridge valve according to claim 1, characterized in that, The pilot valve body has a first process port on its outer peripheral surface that communicates with the first control fluid channel, and a removable first plug is provided in the first process port; and / or The pilot valve body has a second process port on its outer peripheral surface that communicates with the second control fluid channel, and a removable second plug is provided in the second process port.

8. The cartridge valve according to claim 1, characterized in that, The pilot valve body includes: ontology; An end cap is disposed on the side of the body away from the main valve port in the first direction. The end cap has an end cap hole that extends through in the first direction, through which the main valve core and the pilot valve core can pass.

9. The cartridge valve according to claim 8, characterized in that, A first sealing groove is provided on the side of the end cap that abuts against the body and / or on the side of the body that abuts against the end cap, and a first sealing element is provided in the first sealing groove; and / or A second sealing groove is provided on the inner wall surface of the end cap hole and / or on the outer peripheral surface of the main valve core that abuts against the inner wall surface of the end cap hole, and a second sealing element is provided in the second sealing groove.

10. The cartridge valve according to claim 1, characterized in that, The first pressure relief channel is provided in multiple forms, and the multiple first pressure relief channels are arranged at intervals along the circumference of the pilot valve body; and / or The second pressure relief channel is provided in multiple forms, and the multiple second pressure relief channels are arranged at intervals along the circumference of the pilot valve body; and / or The second return channel is provided in multiple ways, and the multiple second return channels are arranged at intervals along the circumference of the pilot valve body.

11. The cartridge valve according to claim 1, characterized in that, The first shoulder extends along the first direction and has a first surface and a second surface that are disposed opposite to each other in the first direction. The first shoulder closes the first pressure relief channel, and the first pressure relief channel is spaced apart from the first surface and the second surface in the first direction, respectively. and / or The second shoulder extends along the first direction and has a third surface and a fourth surface that are disposed opposite to each other in the first direction. The second shoulder closes the second pressure relief channel, which is spaced apart from the third surface and the fourth surface in the first direction.

12. The cartridge valve according to claim 1, characterized in that, Both the first shoulder and the second shoulder are columnar. The columnar first shoulder and the second shoulder respectively cooperate with the inner circumferential surface of the main valve core to define a first cavity, a second cavity and a third cavity. At least one of the first cavity, the second cavity and the third cavity is connected to the return cavity through the second return channel. The first cavity is adjacent to the first shoulder and away from the second shoulder. The second cavity is located between the first shoulder and the second shoulder. The third cavity is away from the first shoulder and adjacent to the second shoulder.

13. The cartridge valve according to claim 12, characterized in that, The first shoulder is provided with a first leakage channel, and the first cavity and the second cavity are connected through the first leakage channel; and / or The second shoulder is provided with a second leakage channel, and the second cavity and the third cavity are connected through the second leakage channel.

14. The cartridge valve according to claim 12, characterized in that, The main valve core is provided with a third leakage channel, and the first chamber and the second chamber are connected through the third leakage channel; and / or The main valve core is provided with a fourth leakage channel, and the second chamber and the third chamber are connected through the fourth leakage channel.

15. The cartridge valve according to any one of claims 1-14, characterized in that, It also includes a first spacer, a second spacer, a third spacer, and a fourth spacer located between the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core, wherein the first control chamber, the return chamber, and the second control chamber are defined between adjacent portions of the first spacer, the second spacer, the third spacer, and the fourth spacer; The first control cavity and the second control cavity are adjacent. One of the first, second, third, and fourth interval portions, located between the first and second control cavities, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. The remaining three of the first, second, third, and fourth interval portions are disposed on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core, and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core; or The first control cavity and the second control cavity are adjacent. One of the first, second, third, and fourth interval portions, which is adjacent to the first control cavity and far from the second control cavity, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. Another of the first, second, third, and fourth interval portions, which is far from the first control cavity and adjacent to the second control cavity, is disposed on the outer peripheral surface of the main valve core and abuts against the inner peripheral surface of the pilot valve body. The remaining two of the first, second, third, and fourth interval portions are disposed on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core. or The return fluid chamber is located between the first control chamber and the second control chamber. Two of the first, second, third, and fourth intervals, which are adjacent to or far from the return fluid chamber, are provided on the outer peripheral surface of the main valve core and abut against the inner peripheral surface of the pilot valve body. The other two of the first, second, third, and fourth intervals are provided on one of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core and abut against the other of the inner peripheral surface of the pilot valve body and the outer peripheral surface of the main valve core.

16. The cartridge valve according to claim 15, characterized in that, The first interval, the second interval, the third interval, and the fourth interval are all annular blocks.

17. The cartridge valve according to claim 15, characterized in that, At least one of the first interval portion, the second interval portion, the third interval portion, and the fourth interval portion is provided as at least two, so as to define at least one of the first control cavity, the second control cavity, and the return fluid cavity as at least two.

18. The cartridge valve according to claim 15, characterized in that, The main valve core spacer is a spacer located on the outer peripheral surface of the main valve core, which is set in the first spacer, the second spacer, the third spacer, and the fourth spacer. A third sealing groove is provided on the side of the main valve core spacer that abuts against the inner peripheral surface of the pilot valve body and / or on the abutting point of the inner peripheral surface of the pilot valve body that abuts against the main valve core spacer. A third sealing element is provided in the third sealing groove. The remaining intervals among the first interval, the second interval, the third interval, and the fourth interval are pilot valve body intervals. A fourth sealing groove is provided on the side of the pilot valve body interval that abuts against the outer peripheral surface of the main valve core and / or on the abutting point of the outer peripheral surface of the main valve core that abuts against the pilot valve body interval. A fourth sealing element is provided in the fourth sealing groove.

19. The cartridge valve according to any one of claims 1-14, characterized in that, The outer circumferential surface of the pilot valve core is provided with an external thread that is away from the main valve port in the first direction. The external thread extends along the first direction. The cartridge valve also includes a threaded sleeve provided on the pilot valve body. The threaded sleeve is provided with a threaded hole that matches the external thread.

20. The cartridge valve according to any one of claims 1-14, characterized in that, It also includes a reset component, the reset component comprising: A reset seat is provided on the side of the pilot valve body away from the main valve port; An elastic part is disposed on the reset seat and connected to the main valve core to stop the flow of working fluid by controlling the main valve port of the main valve core.

21. The cartridge valve according to claim 20, characterized in that, The elastic part is a spring in a compressed state.

22. The cartridge valve according to any one of claims 1-14, characterized in that, It also includes a pilot valve spool drive assembly, which includes: A stepper motor is located on the side of the pilot valve body away from the main valve port, and the output shaft of the stepper motor is connected to the pilot valve core.

23. The cartridge valve according to any one of claims 1-14, characterized in that, It also includes a main valve body, which has a working fluid port and a high-pressure fluid inlet. The main valve body is disposed on the pilot valve body and sleeved on the main valve port. The main valve body and the main valve port cooperate to define a high-pressure fluid channel and a working fluid channel. The high-pressure fluid channel can be connected to the working fluid channel. The high-pressure fluid channel is connected to the high-pressure fluid inlet, and the working fluid channel is connected to the working fluid port.

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