Pilot valve and pilot-type directional valve

Abstract

The present application relates to flow control device technical field, specifically to a kind of pilot valve and pilot type reversing valve, the pilot valve includes pilot valve body, pilot valve core subassembly and piezoelectric actuator, pilot valve core subassembly is located in pilot valve body, pilot valve core subassembly includes valve seat and pressure rod, pressure rod is arranged in valve seat, and pressure rod is movable in the length direction of valve seat, piezoelectric actuator includes driving component, driving component is connected with the end of pressure rod away from valve seat, and driving component can drive pressure rod move in the length direction of valve seat, the present application proposes a kind of pilot valve, can improve the thrust of fluid pilot valve also can improve flow control precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow control devices, and particularly relates to a pilot valve and a pilot type reversing valve. BACKGROUND

[0002] A typical reversing valve includes an electromagnetic reversing valve and a hydraulic pilot reversing valve, and the electromagnetic reversing valve includes an electromagnetic pilot valve part and a main valve part. The electromagnetic pilot valve in the electromagnetic reversing valve in the related art uses an electromagnet to convert an electric signal into a mechanical displacement to drive a pilot valve core to open. However, the electromagnet has a relatively complex structure and a relatively large size, and due to the use of power consumption, the generated thrust is relatively small, which is easy to cause liquid leakage due to insufficient thrust of a pressure rod. SUMMARY

[0003] The present application aims to at least partly solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a pilot valve, which can improve the thrust of a fluid pilot valve and improve the flow control accuracy.

[0004] An embodiment of the present application further proposes a pilot type reversing valve, which can improve the flow control accuracy of a fluid pilot type reversing valve.

[0005] The pilot valve of the embodiment of the present application includes a pilot valve body, a pilot valve core assembly arranged in the pilot valve body, the pilot valve core assembly including a valve seat and a pressure rod, the pressure rod being arranged in the valve seat and being movable in the length direction of the valve seat, and a piezoelectric actuator including a driving part connected to one end of the pressure rod away from the valve seat and capable of moving the pressure rod in the length direction of the valve seat.

[0006] In some embodiments, the piezoelectric actuator further includes a housing having a cavity therein, a piezoelectric ceramic sheet arranged in the cavity, and a cable having one end connected to one end of the piezoelectric ceramic sheet and the other end connected to the driving part.

[0007] In some embodiments, the piezoelectric actuator further includes a first elastic member arranged in the cavity, the first elastic member being sleeved on the driving part, one end of the first elastic member being in abutment with one side of the driving part away from the piezoelectric ceramic sheet, and the other end of the first elastic member being in abutment with the inner wall surface of the housing.

[0008] In some embodiments, the piezoelectric actuator further includes a swing rod, one end of the swing rod being pivotally connected to the housing, the other end of the swing rod being swingable, and the swing rod being in abutment with the driving part.

[0009] In some embodiments, the piezoelectric actuator further comprises an adjusting assembly for adjusting the depth of the one end of the swing rod extending into the pilot valve body.

[0010] In some embodiments, the driving component comprises a detachably connected driving block and a driving rod, the adjusting assembly is arranged in the housing, and the adjusting assembly comprises a connecting sleeve, the connecting sleeve is arranged in the driving block, the driving rod extends into the connecting sleeve, and the depth of the driving rod extending into the connecting sleeve is adjustable.

[0011] In some embodiments, the driving component comprises an integrally formed driving block and a driving rod, the adjusting assembly is arranged outside the housing, the adjusting assembly is connected with the swing rod, and the adjusting assembly is connected with the one end of the swing rod away from the housing, the adjusting assembly comprises an adjusting rod, the adjusting rod is arranged in the swing rod, and the adjusting rod is movable in the length direction of the housing, and one end of the adjusting rod is adapted to extend into the pilot valve body and is connected with the pressure rod.

[0012] In some embodiments, the pilot valve further comprises a connecting sleeve and a locking nut, the piezoelectric actuator is arranged in the connecting sleeve, one end of the connecting sleeve extends into the pilot valve body, and the nut is sleeved on the connecting sleeve.

[0013] In some embodiments, the pilot valve further comprises a protective cover, the protective cover is sleeved outside the piezoelectric actuator, and the protective cover is connected with the pilot valve body.

[0014] In some embodiments, the pilot valve further comprises a spring seat and a second elastic member, the spring seat is arranged in the valve seat, one end of the spring seat is in abutment with the pressure rod, and the other end of the spring seat is in abutment with the second elastic member.

[0015] The pilot type reversing valve of the embodiment of the present application comprises a pilot valve and a reversing valve assembly, the pilot valve is connected with the reversing valve assembly, and the pilot valve is the pilot valve of any one of the above embodiments.

[0016] The reversing valve assembly comprises a reversing valve body and a reversing valve core assembly, the reversing valve core assembly is arranged in the reversing valve body, and the reversing valve body is in communication with the pilot valve body. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the pilot valve of the embodiment of the present application, and does not comprise a protective cover.

[0018] Figure 2 is a structural schematic view of the pilot valve of the embodiment of the present application from another angle.

[0019] Figure 3 is a structural schematic view of the pilot valve of the embodiment of the utility model, and it includes a protective cover.

[0020] Figure 4 is a sectional view of the pilot valve of the embodiment of the utility model.

[0021] Figure 5 is a sectional view of the pilot valve of another embodiment of the utility model.

[0022] Figure 6 is a structural schematic view of the pilot type reversing valve of the embodiment of the application.

[0023] Figure 7 is a sectional view of the pilot type reversing valve of the embodiment of the application.

[0024] Figure 8 is a structural schematic view of the piezoelectric actuator of the embodiment of the application.

[0025] Figure 9 is a structural schematic view of the piezoelectric actuator of another embodiment of the application.

[0026] Figure 10 is a structural schematic view of the piezoelectric actuator of still another embodiment of the application.

[0027] Reference signs:

[0028] Piezoelectric actuator 100, pilot valve 200, pilot valve body 210, pilot valve core assembly 220, reversing valve assembly 300, reversing valve body 310, reversing valve core assembly 320, terminal 400, connecting plate 500,

[0029] Valve seat 1, pressing rod 2, driving part 3, driving block 31, driving rod 32, shell 4, chamber 41, piezoelectric ceramic sheet 5, cable 6, first elastic member 7, swing rod 8, first through hole 81, second through hole 9, adjusting assembly 10, connecting sleeve 101, adjusting rod 102, connecting sleeve 11, locking nut 12, protective cover 13, spring seat 14, second elastic member 15, mounting seat 16, rotating shaft 17, lever assembly 18. DETAILED DESCRIPTION

[0030] The embodiments of the application are described in detail below, examples of which are shown in the drawings. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the application, and cannot be understood as a limitation of the application.

[0031] As Figures 1 to 5As shown, the pilot valve of the embodiment of the present application comprises a pilot valve body 210, a pilot valve core assembly 220 arranged in the pilot valve body 210, and a piezoelectric actuator 100, the pilot valve core assembly 220 comprises a valve seat 1 and a pressure rod 2, the pressure rod 2 is arranged in the valve seat 1 and is movable in the length direction of the valve seat 1, and the piezoelectric actuator 100 comprises a driving component 3 connected to the end of the pressure rod 2 away from the valve seat 1, and the driving component 3 can drive the pressure rod 2 to move in the length direction of the valve seat 1.

[0032] Specifically, the right end of the pilot valve body 210 is connected to the left end of the piezoelectric actuator 100, the pressure rod 2 is arranged in the valve seat 1, the left end of the driving component 3 is connected to the right end of the pressure rod 2, and the left-right movement of the driving component 3 drives the pressure rod 2 to move in the left-right direction. The pilot valve core assembly 220 comprises the valve seat 1 and the pressure rod 2, the pressure rod 2 is arranged in the valve seat 1 and is movable in the length direction (e.g. Figure 2 the left-right direction) of the valve seat 1. The piezoelectric actuator 100 comprises the driving component 3 connected to the end of the pressure rod 2 away from the valve seat 1, and the driving component 3 can drive the pressure rod 2 to move in the length direction of the valve seat 1.

[0033] When a potential difference is applied to the piezoelectric actuator 100, the driving component 3 is displaced under the action of the potential difference to generate a thrust, which drives the left-right movement of the pressure rod 2 through the connection between the driving component 3 and the pressure rod 2, and drives the movement of the pilot valve core, and further drives the movement of the reversing valve assembly 300. Moreover, the extension amount of the driving component 3 of the piezoelectric actuator 100 is in a certain proportional relationship with the control voltage, and the displacement amount of the valve core can be accurately controlled by controlling the size of the potential difference, i.e. the flow rate and pressure of the valve port of the pilot valve can be adjusted, and the flow control accuracy of the pilot valve is improved.

[0034] The thrust generated by the movement of the electromagnetic iron driving valve core is 5-40 N, and the thrust required for the opening of the pilot valve core assembly 220 in operation is usually 40-80 N. In the related art, a lever assembly 18 is arranged between the electromagnetic iron and the pilot valve core to amplify the thrust. The piezoelectric actuator 100 of the embodiment of the present application can generate a thrust of 50-100000 N, which is much larger than the thrust required for the movement of the pilot valve core assembly 220. The driving component 3 of the embodiment of the present application is directly connected to the pressure rod 2, which reduces the overall size of the pilot valve 200 and the manufacturing cost of the pilot valve 200, and further reduces the overall size and manufacturing cost of the pilot valve.

[0035] The pilot valve of the embodiment of the present application controls the movement of the pressure rod 2 in the pilot valve core assembly 220 through the piezoelectric actuator 100, the pilot valve 200 is connected with the reversing valve assembly 300 to drive the movement of the reversing valve assembly 300, and the piezoelectric actuator 100 has faster response speed, greater output force and lower power consumption compared with the control mode of the electromagnet in the related art, the displacement of the pressure rod 2 is controlled through the piezoelectric actuator 100 to improve the control accuracy of the pilot valve 200, and then the flow control accuracy of the pilot valve is improved.

[0036] It should be noted that the main inlet of the valve body of the reversing valve assembly 300 is communicated with the inlet channel; the channel penetrates through the valve body, and both ends are sealed by the screw plug; the channel is communicated with the inlet cavity of the cartridge type reversing valve core assembly 320, and both ends are sealed; at the same time, another channel is communicated with the inlet cavity of the pilot valve 200 through the precision filter and the cartridge type inlet check valve. The channel penetrates through the valve body, and both ends are sealed; in addition, the main return port of the valve body is communicated with the return channel; the return channel penetrates through the valve body, and both ends are sealed, and is communicated with the return cavity of the cartridge type reversing valve assembly; the return port of the electromagnetic pilot valve is communicated with the main return port through the cartridge type return check valve.

[0037] The pilot valve 200 further comprises a screw sleeve, a pressure sleeve, a guide sleeve, a first magnetic ball, a top rod arranged in the valve seat 1 and a second magnetic ball, the pressure sleeve is arranged between the valve seat 1 and the guide sleeve, the pressure sleeve is provided with a first pressure rod 2 hole combination, the guide sleeve is provided with a second pressure rod 2 hole, the second magnetic ball is arranged in the first pressure rod 2 hole combination, the pressure rod 2 passes through the first pressure rod 2 hole combination and the second pressure rod 2 hole in sequence, and is connected with the lever assembly 18 through a screw fine adjustment combination, the guide sleeve, the pressure sleeve and the pressure rod 2 are matched in a simple structure, high-pressure leakage points are reduced, fault points are few, and the service life is improved.

[0038] Optionally, the first pressure rod 2 hole combination comprises a pressure sleeve large hole and a pressure sleeve small hole, the pressure rod 2 is provided with a pressure rod 2 head and a pressure rod 2 rod, the pressure rod 2 head moves in the pressure sleeve large hole and is used for controlling the conduction of the second magnetic ball, and the pressure rod 2 rod passes through the pressure sleeve small hole and the second pressure rod 2 hole, and the structure is stable and reliable in action. The guide sleeve is provided with a sealing ring mounting groove, the sealing ring mounting groove is provided with an O-shaped ring, the O-shaped ring does not bear high-pressure liquid, leakage hidden dangers are reduced, and the sealing effect is good.

[0039] In some embodiments, the piezoelectric actuator 100 further comprises a shell 4, a piezoelectric ceramic sheet 5 and a cable 6, the shell 4 has a cavity 41 in the shell 4, the piezoelectric ceramic sheet 5 is arranged in the cavity 41, one end of the cable 6 penetrates through the shell 4 and is connected with one end of the piezoelectric ceramic sheet 5, and the other end of the piezoelectric ceramic sheet 5 is connected with the driving part 3.

[0040] Specifically, the driving part 3 is arranged in the shell 4, the right end of the driving part 3 is connected with the piezoelectric ceramic sheet 5, and the left end of the driving part 3 can extend out of the shell 4 and is connected with the pressure rod 2.

[0041] Optionally, when the lower end of the cable 6 applies a potential difference between the two ends of the piezoelectric ceramic sheet 5 through the shell 4, the piezoelectric ceramic sheet 5 extends axially, and the driving component 3 moves left under the action of the axial extension of the piezoelectric ceramic sheet 5. The left end of the driving component 3 is connected to the right end of the pressure rod 2 to push the pressure rod 2 to move left.

[0042] In some embodiments, the piezoelectric actuator 100 further comprises a first elastic member 7 arranged in the cavity 41, the first elastic member 7 is sleeved on the driving component 3, and one end of the first elastic member 7 abuts against the side of the driving component 3 away from the piezoelectric ceramic sheet 5, and the other end of the first elastic member 7 abuts against the inner wall surface of the shell 4.

[0043] Specifically, the first elastic member 7 is arranged at the left end of the cavity 41, the first elastic member 7 is sleeved on the driving component 3, and the left end of the first elastic member 7 abuts against the inner wall surface of the shell 4, and the right end of the first elastic member 7 abuts against the right end of the driving component 3. Through the arrangement of the first elastic member 7, the driving component 3 is closely connected with the piezoelectric ceramic sheet 5, and it is ensured that the displacement amount of the axial extension of the piezoelectric ceramic sheet 5 can be effectively transmitted to the driving component 3, so that the driving component 3 drives the pressure rod 2 to move, thereby reducing the energy consumption of the piezoelectric actuator 100.

[0044] In some embodiments, the piezoelectric actuator 100 further comprises a swing rod 8, one end of the swing rod 8 is pivotally connected to the shell 4, and the other end of the swing rod 8 is swingable, and the swing rod 8 abuts against the driving component 3.

[0045] As shown in Figure 3 the left end of the driving component 3 abuts against the right middle part of the swing rod 8, the upper end of the swing rod 8 is pivotally connected to the shell 4, and the lower end of the swing rod 8 is rotatable about the pivot point.

[0046] Optionally, the piezoelectric actuator 100 further comprises a mounting seat 16 and a rotating shaft 17, the right end of the mounting seat 16 is connected to the left end of the shell 4, the upper end of the swing rod 8 is provided with a first through hole 81, and the lower end of the rotating shaft 17 passes through the mounting seat 16 and the first through hole 81 in sequence to fix the upper end of the swing rod 8 on the mounting seat 16, so as to realize the pivotal connection between the swing rod 8 and the mounting seat 16, that is, the swing rod 8 can rotate about the rotating shaft.

[0047] For example, the mounting seat 16 and the shell 4 can be connected by threads, and the specific connection mode between the mounting seat 16 and the shell 4 is not limited in the present application, as long as the rigid connection between the mounting seat 16 and the shell 4 can be realized.

[0048] The embodiment of the present application adjusts the distance between the abutting point of the driving component 3 and the swing lever 8 and the pivot point of the swing lever 8, that is, adjusts the ratio value between the distance between the one end of the swing lever 8 away from the pivot point and the pivot point and the distance between the abutting point of the swing lever 8 and the pivot point of the swing lever 8, so as to adjust the displacement amplification multiple of the swing lever 8.

[0049] When the potential difference is applied to the piezoelectric actuator 100, the piezoelectric ceramic sheet 5 extends in the axial direction, the driving component 3 moves to the left under the action of the axial extension of the piezoelectric ceramic sheet 5, the left end of the driving component 3 abuts against the right middle part of the swing lever 8 to push the swing lever 8 to move to the left, and the left movement of the swing lever 8 drives the swing lever 8 to rotate to the left around the rotation shaft 17, so that the lower end of the swing lever 8 can generate a larger displacement under the action of the driving component 3 moving to the left, that is, the middle part of the swing lever 8 is pushed to rotate to the left by the driving component 3, so that the lower end of the swing lever 8 can generate a larger displacement, thereby increasing the stroke of the piezoelectric actuator 100.

[0050] It should be noted that the displacement generated by the single piezoelectric ceramic sheet 5 is very small, and in the related art, in order to increase the displacement generated by the piezoelectric actuator 100, tens to hundreds of piezoelectric ceramic sheets 5 are stacked to increase the displacement of the piezoelectric actuator 100, but the stacking of multiple piezoelectric ceramic sheets 5 increases the size and volume of the piezoelectric actuator 100, and the embodiment of the present application uses a smaller number of stacked piezoelectric ceramic sheets 5 to drive the driving component 3 to move to the left, and then drive the middle part of the swing lever 8 to displace to the left, and according to the principle of the lever, the displacement of the driving component 3 to the left under the action of the axial extension of the piezoelectric ceramic sheet 5 is smaller than the displacement of the lower part of the swing lever 8 to the left, that is, a larger displacement is generated by using a smaller number of stacked piezoelectric ceramic sheets 5, thereby increasing the stroke of the piezoelectric actuator 100, and using a smaller number of piezoelectric ceramic sheets 5 can reduce the size and volume of the piezoelectric actuator 100, thereby reducing the cost and consumption of the pilot type reversing valve.

[0051] In some embodiments, the piezoelectric actuator 100 further comprises an adjusting assembly 10, and the adjusting assembly 10 is used to adjust the depth of the one end of the swing lever 8 away from the housing 4 into the pilot valve body 210.

[0052] As shown in Figure 4 , the distance between the lower end of the swing lever 8 and the housing 4 is adjusted by the adjusting assembly 10, and then the depth of the lower end of the swing lever 8 into the pilot valve body 210 is adjusted, so as to adjust the initial installation position of the swing lever 8.

[0053] It should be noted that since the axial extension distance of the piezoelectric ceramic sheet 5 is in microns, the displacement adjustment of the piezoelectric actuator 100 is in microns, generally 0-500 microns, and the moving distance of the pilot valve core is in millimeters, generally 0.1-50 millimeters. When the piezoelectric actuator 100 is in use, if the initial installation position of the piezoelectric actuator 100 deviates, the working range of the piezoelectric actuator 100 will be exceeded, resulting in the failure of the piezoelectric actuator 100 to adjust. The piezoelectric actuator 100 needs to be frequently disassembled to adjust the installation position of the piezoelectric actuator 100, that is, the installation position of the piezoelectric actuator 100 is required to be high when the piezoelectric actuator 100 is in use. The embodiment of the present application adjusts the distance of the swing rod 8 extending into the pilot valve body 210 by setting the adjusting assembly 10, reduces the precision requirement of the installation position of the piezoelectric actuator 100, realizes the adjustment of the initial installation position of the piezoelectric actuator 100, and improves the installation efficiency of the piezoelectric actuator 100.

[0054] Optionally, there is a certain gap between each part on the transmission path between the driving component 3 of the piezoelectric actuator 100 and the pressing rod 2. When the total length of the gap exceeds the working range of the piezoelectric actuator 100, or the effective total length of each part on the transmission path is greater than the required length between the piezoelectric actuator 100 and the pressing rod 2, the pressing rod 2 cannot be sealed and connected with the valve seat 1 at the initial position. In related technologies, the piezoelectric actuator 100 needs to be disassembled as a whole to adjust the installation position, which causes the piezoelectric actuator 100 to be frequently installed and the precision of the installation position to be difficult to guarantee each time. The embodiment of the present application sets the adjusting assembly 10 on the piezoelectric actuator 100, adjusts the distance of the swing rod 8 extending into the valve seat 1 through the adjusting assembly 10, ensures that the pressing rod 2 and the valve seat 1 are in a sealed state at the initial position, and the gap is located within the working range of the piezoelectric actuator 100, so that the displacement generated by the piezoelectric actuator 100 can effectively drive the pressing rod 2 to move.

[0055] In some embodiments, the driving component 3 includes a detachably connected driving block 31 and a driving rod 32, the adjusting assembly 10 is arranged in the shell 4, and the adjusting assembly 10 includes a connecting sleeve 101, the connecting sleeve 101 is arranged in the driving block 31, the driving rod 32 extends into the connecting sleeve 101, and the depth of the driving rod 32 extending into the connecting sleeve 101 is adjustable.

[0056] Specifically, the connecting sleeve 101 is arranged in the driving block 31, the right end of the driving rod 32 extends into the connecting sleeve 101 and is detachably connected with the driving block 31 to adjust the depth of the right end of the driving rod 32 extending into the driving block 31, the right end of the driving block 31 is connected with the piezoelectric ceramic wafer 5, the left end of the driving rod 32 abuts against the middle part of the right side of the swing rod 8, the upper end of the swing rod 8 is pivotally connected with the mounting seat 16, the lower end of the swing rod 8 can rotate around the pivot point, the depth of the left end of the swing rod 8 extending into the pilot valve body 210 is adjusted by adjusting the depth of the right end of the driving rod 32 extending into the connecting sleeve 101, the initial installation position of the piezoelectric actuator 100 is adjusted, and the installation efficiency of the piezoelectric actuator 100 is improved.

[0057] Optionally, the piezoelectric ceramic wafer 5 has a ring structure, a second through hole 9 is arranged at the central axis position of the piezoelectric ceramic wafer 5, the connecting sleeve 101 is arranged in the driving block 31, and the left end of the adjusting tool can extend into the second through hole 9 and be inserted into the connecting sleeve 101 to adjust the distance of the right end of the driving rod 32 extending into the connecting sleeve 101, and then the length of the lower end of the swing rod 8 extending into the pilot valve body 210 is adjusted, the initial installation position of the piezoelectric actuator 100 is adjusted, and the installation efficiency of the piezoelectric actuator 100 is improved.

[0058] The embodiment of the present application adjusts the depth of the right end of the driving rod 32 extending into the driving block 31 by inserting the adjusting tool into the connecting sleeve 101 through the second through hole 9, and then adjusts the distance of the swing rod 8 extending into the pilot valve body 210, adjusts the initial installation position of the piezoelectric actuator 100, applies a potential difference to both ends of the piezoelectric ceramic wafer 5, the piezoelectric ceramic wafer 5 extends axially, the driving block 31 moves left under the axial extension of the piezoelectric ceramic wafer 5, the driving block 31 drives the driving rod 32 to move left, and then drives the swing rod 8 to move left, and the left movement of the driving rod 2 is realized.

[0059] For example, the driving rod 32 and the driving block 31 are connected by threads, and correspondingly, the connection position of the driving rod 32 and the connecting sleeve 101 is set as an adjusting structure of internal and external thread cooperation, the structure of thread connection is more delicate, the adjustment accuracy is higher, and the adjustment is fast and convenient.

[0060] For example, the second through hole 9 is a hexagonal hole, and the adjusting tool is a hexagonal screwdriver or a hexagonal wrench matched with the hexagonal hole, that is, the left end of the hexagonal screwdriver is inserted into the connecting sleeve 101 through the second through hole 9, and the position of the driving shaft is adjusted by rotating the hexagonal screwdriver, so that the depth of the driving rod 32 inserted into the connecting sleeve 101 is accurately adjusted. It can be understood that the shape of the second through hole 9 and the adjusting tool can be other shapes, such as a quadrangular hole, a slot, a cross slot, an external hexagonal boss, and an external quadrangular boss. The shape of the second through hole 9 and the type of the adjusting tool are not limited in the embodiment of the present application, as long as the rotating torque is matched to adjust the distance of the right end of the driving rod 32 inserted into the connecting sleeve 101.

[0061] In some embodiments, the driving component 3 comprises the driving block 31 and the driving rod 32 integrally formed, the adjusting assembly 10 is arranged outside the housing 4, the adjusting assembly 10 is connected with the swing rod 8, and the adjusting assembly 10 is connected with the end of the swing rod 8 away from the housing 4. The adjusting assembly 10 comprises an adjusting rod 102, the adjusting rod 102 is arranged in the swing rod 8, and the adjusting rod 102 is movable in the length direction of the housing 4. One end of the adjusting rod 102 is adapted to be inserted into the pilot valve body 210 and connected with the pressing rod 2.

[0062] Specifically, as shown in Figure 5 the adjusting assembly 10 is arranged outside the housing 4, the adjusting assembly 10 is connected with the lower end of the swing rod 8, the left end of the adjusting rod 102 is inserted into the pilot valve body 210 and connected with the pressing rod 2, and the right end of the adjusting rod 102 is inserted into the lower end of the swing rod 8. The length of the adjusting rod 102 inserted into the valve seat 1 is adjusted by adjusting the depth of the adjusting rod 102 inserted into the swing rod 8, so that the initial installation position of the piezoelectric actuator 100 is adjusted, and the installation efficiency of the piezoelectric actuator 100 is improved.

[0063] Optionally, the adjusting assembly 10 is arranged outside the housing 4, so that the angle between the swing rod 8 and the driving rod 32 is adjusted, that is, the depth of the adjusting rod 102 inserted into the swing rod 8 is adjusted, and the swing rod 8 is replaced when the swing rod 8 is worn.

[0064] For example, when the adjusting rod 102 and the swing rod 8 are connected by threads, the depth of the adjusting rod 102 inserted into the swing rod 8 is adjusted by clamping the wrench and rotating the adjusting rod 102.

[0065] It can be understood that the piezoelectric actuator 100 of the embodiment of the present application can simultaneously comprise the adjusting assembly 10 and the swing rod 8, or only comprise the swing rod 8, or only comprise the adjusting assembly 10. Moreover, the position of the adjusting assembly 10 can be arranged in the housing 4 or outside the housing 4. The specific arrangement of the piezoelectric actuator 100 is subject to actual requirements.

[0066] In some embodiments, the pilot valve further comprises a connecting sleeve 11 and a locking nut 12, the piezoelectric actuator 100 is arranged in the connecting sleeve 11, one end of the connecting sleeve 11 extends into the pilot valve body 210, and the locking nut 12 is arranged on the connecting sleeve 11.

[0067] Specifically, the connecting sleeve 11 is arranged at the right end of the pilot valve, the left end of the connecting sleeve 11 extends into the pilot valve body 210 to fix the position of the connecting sleeve 11, and the piezoelectric actuator 100 is connected with the pilot valve body 210 by arranging the locking nut 12 on the connecting sleeve 11.

[0068] Optionally, the pilot valve further comprises a connecting plate 500, the left end of the connecting plate 500 is connected with the pilot valve body 210, and the right end of the connecting plate 500 is connected with the piezoelectric actuator 100, that is, when the piezoelectric actuator 100 is connected with the pilot valve, the connecting plate 500 is first fixed with the pilot valve body 210 by screws, then the piezoelectric actuator 100 is screwed into the mounting hole on the connecting plate 500 by the locking nut 12, until there is a small gap, usually 0-3mm, between the output shaft of the piezoelectric actuator 100 and the distal end of the lever assembly 18, and finally the piezoelectric actuator 100 is retracted using a retracting nut, completing the installation of the piezoelectric actuator 100. When it is necessary to adjust the position of the piezoelectric actuator 100, the initial installation position of the piezoelectric actuator 100 is adjusted by the adjusting assembly 10, improving the installation efficiency of the piezoelectric actuator 100.

[0069] In some embodiments, the pilot valve further comprises a protective cover 13, the protective cover 13 is arranged outside the piezoelectric actuator 100, and the protective cover 13 is connected with the pilot valve body 210.

[0070] Specifically, the protective cover 13 is arranged outside the piezoelectric actuator 100, which can protect the piezoelectric actuator 100 while changing the appearance of the piezoelectric actuator 100, improving the aesthetic appearance, and the protective cover 13 arranged outside the piezoelectric actuator 100 can improve the dustproof, waterproof and explosion-proof performance of the piezoelectric actuator 100.

[0071] Optionally, the wires of the two piezoelectric actuators 100 are connected to one wire terminal 400, and the wire terminal 400 is a multi-core wire joint.

[0072] In some embodiments, the pilot valve further comprises a spring seat 14 and a second elastic member 15, the spring seat 14 is arranged in the valve seat 1, one end of the spring seat 14 abuts against the pressure rod 2, the other end of the spring seat 14 abuts against the second elastic member 15, the reversing valve assembly 300 comprises a reversing valve body 310 and a reversing valve core group 320, the reversing valve core group 320 is arranged in the reversing valve body 310, and the reversing valve body 310 is connected with the pilot valve body 210.

[0073] Specifically, the spring seat 14 is located inside the valve seat 1. The right end of the spring seat 14 abuts against the pressure rod 2, and the left end of the spring seat 14 abuts against the second elastic element 15. The arrangement of the spring seat 14 and the second elastic element 15 improves the sealing performance of the pilot valve. The upper end of the directional valve body 310 is connected to the lower end of the pilot valve body 210. The directional valve assembly 300 is located inside the directional valve body 310 and communicates with the pilot valve 200. The piezoelectric actuator 100 drives the pilot valve 200 to open, thereby driving the movement of the directional valve.

[0074] For example, the number of pilot valves 200 can be set to 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15.

[0075] like Figures 6 to 8 As shown, the pilot-operated directional valve of this embodiment includes a pilot valve 200 and a directional valve assembly 300. The pilot valve 200 is connected to the directional valve assembly 300, and the pilot valve 200 is the pilot valve 200 described in any of the above embodiments.

[0076] Specifically, the pilot valve 200 is connected to the directional valve assembly 300. The pilot valve 200 includes a pilot valve body 210 and a pilot valve core assembly 220. The pilot valve core assembly 220 is located inside the pilot valve body 210. The lower end of the pilot valve 200 is connected to the upper end of the directional valve assembly 300. The left end of the piezoelectric actuator 100 is connected to the right end of the pilot valve 200. The pilot valve 200 is located inside the pilot valve body 210. The right end of the pilot valve body 210 is connected to the left end of the piezoelectric actuator 100. The pressure rod 2 passes through the valve seat 1. The left end of the drive component 3 is connected to the right end of the pressure rod 2. The left and right movement of the drive component 3 drives the pressure rod 2 to move in the left and right direction.

[0077] 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.

[0078] In addition, the terms "first", "second", etc. are used only to describe different instances, and are not used to indicate or imply relative importance or a number of indications of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0079] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "on", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0081] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present description and the features of different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A pilot valve characterized by, The application relates to a pilot valve and a reversing valve assembly. The pilot valve comprises a pilot valve body, a pilot valve core assembly arranged in the pilot valve body, a piezoelectric actuator, an adjusting assembly, a spring seat and a second elastic member. The pilot valve core assembly comprises a valve seat and a pressure rod arranged in the valve seat and movable in the length direction of the valve seat. The piezoelectric actuator comprises a driving part connected to one end of the pressure rod away from the valve seat and capable of driving the pressure rod to move in the length direction of the valve seat, a housing with a cavity, a piezoelectric ceramic piece and a first elastic member arranged in the cavity, the first elastic member sleeved on the driving part and abutting against one end of the driving part away from the piezoelectric ceramic piece and the inner wall of the housing. The adjusting assembly is used for adjusting the depth of the other end of the swing rod away from the housing and extending into the pilot valve body. The driving part comprises a driving block and a driving rod detachably connected, the adjusting assembly is arranged in the housing, and the adjusting assembly comprises a connecting sleeve pipe arranged in the driving block and a driving rod extending into the connecting sleeve pipe and capable of being adjusted in depth.

2. The pilot valve of claim 1, wherein The piezoelectric actuator further comprises a wire cable, one end of the wire cable is connected to one end of the piezoelectric ceramic piece through the housing, and the other end of the piezoelectric ceramic piece is connected to the driving part.

3. The pilot valve of claim 1, wherein The piezoelectric actuator further comprises a connecting sleeve and a locking nut, the piezoelectric actuator is arranged in the connecting sleeve, one end of the connecting sleeve extends into the pilot valve body, and the nut is sleeved on the connecting sleeve.

4. Pilot valve according to any of claims 1-3, characterized in that The piezoelectric actuator further comprises a protective cover, the protective cover is sleeved outside the piezoelectric actuator, and the protective cover is connected to the pilot valve body.

5. The pilot valve of claim 1, wherein The spring seat is arranged in the valve seat, one end of the spring seat abuts against the pressure rod, and the other end of the spring seat abuts against the second elastic member.

6. A pilot operated directional control valve characterized by, The application relates to a pilot valve and a reversing valve assembly. The pilot valve and the reversing valve assembly are connected, and the pilot valve is the pilot valve in any one of claims 1-5. The reversing valve assembly comprises a reversing valve body and a reversing valve core assembly arranged in the reversing valve body and connected with the pilot valve body. ​

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