Hydraulic valve

Abstract

The utility model discloses a hydraulic valve, which comprises a valve sleeve, a valve core, a valve rod and a valve core, the liquid inlet valve element is arranged in the containing cavity in a sliding mode; the liquid return valve element is arranged in the containing cavity in a sliding mode; and the position detection assembly is arranged on the side, away from the liquid inlet valve element, of the liquid return valve element, and the position detection assembly comprises an inductive sensor. According to the liquid return valve, the inductive sensor based on the LDC inductive non-contact displacement detection technology is installed in the valve sleeve to detect the position of the liquid return valve element, and the inductive sensor is only provided with a PCB coil, is not affected by dirt and dust, is small in occupied space and easy to install and has better environmental adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of valve equipment, in particular to a hydraulic valve. Background Art

[0002] Hydraulic supports are key supporting equipment for fully mechanized mining working faces in coal mines. Existing hydraulic supports rely on switch-type electro-hydraulic directional valves to perform lifting, lifting, and pushing movements. Due to the large inertia of the support itself and the load, the sudden change in flow during rapid switching of the switch-type electro-hydraulic directional valve will cause a huge hydraulic shock, causing vibration of equipment and pipelines, and even damage to hydraulic components and systems, seriously affecting production; at the same time, in order to ensure the support effect, a small flow rate is required to adjust the posture of the hydraulic support. At present, hydraulic valves that can achieve continuous flow regulation mainly include main valves, pilot valves, and displacement monitoring components. The cooperation of pilot valves and displacement monitoring components realizes stepless flow regulation.

[0003] In the prior art, there are mainly two types of displacement monitoring devices. One is to use an LVDT sensor (Linear Variable Displacement Transducer), i.e., a linear differential transformer, for contact displacement detection. The LVDT sensor is large in size and is greatly affected by the installation space, making it inconvenient to install. At the same time, it is also affected by external magnets and has poor environmental adaptability. The other method is to use a rectangular displacement feedback slot to indirectly obtain the valve core displacement, which has low detection accuracy. Utility Model Content

[0004] The utility model aims to at least solve the technical problems existing in the prior art that the displacement detection sensor is large in size, greatly affected by the installation space, inconvenient to install, and affected by external magnets, and has low environmental adaptability and detection accuracy.

[0005] To this end, one object of the utility model is to provide a hydraulic valve, the hydraulic valve comprising:

[0006] A valve sleeve having a receiving cavity;

[0007] A liquid inlet valve core, slidably disposed in the accommodating cavity;

[0008] A liquid return valve core is slidably disposed in the accommodating cavity;

[0009] The position detection component is arranged on a side of the liquid return valve core away from the liquid inlet valve core, and the position detection component includes an inductive sensor.

[0010] In some embodiments, one end of the valve sleeve is connected to a plug, and the inductive sensor, the plug and the liquid return valve core form a control chamber.

[0011] In some embodiments, a sealing member is provided at one end of the inductive sensor close to the liquid return valve core, and a sealing ring is provided between the inductive sensor and the plug.

[0012] In some embodiments, the inductive sensor is connected to a connector, and the connector passes through one side of the plug and is fixed by a fixing member.

[0013] In some embodiments, the hydraulic valve also includes an inlet valve seat and a return valve seat, the inlet valve seat is connected to the valve sleeve and is movably connected to the inlet valve core, the return valve seat is connected to the return valve core, the valve sleeve, the inlet valve seat and the inlet valve core form an inlet cavity, and the inlet valve seat, the return valve core and the valve sleeve form a return cavity.

[0014] In some embodiments, an elastic member is provided on the outer peripheral side of the liquid inlet valve core to push the liquid inlet valve core to cut off the liquid inlet cavity and the liquid return cavity.

[0015] In some embodiments, a guide sleeve is connected to one end of the valve sleeve close to the liquid inlet valve core, and the guide sleeve is connected to the liquid inlet valve core.

[0016] In some embodiments, the valve sleeve, the plug and the liquid return valve core form a balance chamber, and the balance chamber is communicated with the liquid return chamber.

[0017] In some embodiments, the accommodating chamber is connected to a pilot circuit, and the pilot circuit includes a liquid inlet pipeline and a liquid return pipeline. The liquid inlet pipeline is connected to the liquid inlet chamber and the control chamber, and the liquid return pipeline is connected to the liquid return chamber.

[0018] In some embodiments, the liquid inlet pipeline is provided with a pressure reducing valve and a pilot proportional pressure reducing valve;

[0019] The pilot circuit also includes a relief valve connected to the pilot proportional pressure reducing valve.

[0020] The hydraulic valve provided by the embodiment of the utility model has the following beneficial effects:

[0021] An inductive sensor based on LDC inductive non-contact displacement detection technology is installed inside the valve sleeve to detect the position of the return valve core. The inductive sensor only has a PCB coil, is not affected by dirt and dust, occupies a small space, is easy to install and has better environmental adaptability;

[0022] The inductive sensor directly detects the position change of the return valve core and further changes the position of the inlet valve core through the controller feedback signal, with high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a structural schematic diagram of a hydraulic valve according to an embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of a valve body of a hydraulic valve according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 1. Valve sleeve; 11. Liquid inlet; 12. Liquid return port; 13. Control port; 14. Liquid outlet; 2. Liquid inlet valve core; 3. Liquid return valve core; 4. Position detection component; 41. Inductive sensor; 42. Seal; 43. Sealing ring; 44. Connector; 45. Fixing part; 5. Plug; 6. Liquid inlet valve seat; 7. Liquid return valve seat; 71. Screw; 8. Elastic part; 9. Guide sleeve; 10. Control chamber; 20. Liquid inlet chamber; 30. Liquid return chamber; 40. Liquid inlet channel; 50. Balance chamber; 100. Pilot circuit; 101. Liquid inlet pipeline; 102. Liquid return pipeline; 103. Pressure reducing valve; 104. Pilot proportional pressure reducing valve; 105. Overflow valve. DETAILED DESCRIPTION

[0028] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0029] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of the embodiments. Other modifications within the scope and spirit of the present utility model will occur to those skilled in the art.

[0030] The accompanying drawings, which are included in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, are used to explain the principles of the present invention.

[0031] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0032] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present invention that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0033] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0034] Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present invention, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present invention. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of ways with substantially any suitable detailed structure.

[0035] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0036] The embodiment of the utility model provides a hydraulic valve, such as Figure 1 and Figure 2 As shown, the hydraulic valve comprises:

[0037] A valve sleeve 1 having a receiving cavity;

[0038] A liquid inlet valve core 2 is slidably disposed in the accommodating cavity;

[0039] A liquid return valve core 3 is slidably disposed in the accommodating cavity;

[0040] The position detection component 4 is disposed on a side of the liquid return valve core 3 away from the liquid inlet valve core 2 , and the position detection component 4 includes an inductive sensor 41 .

[0041] The change in the relative position of the liquid inlet valve core 2 and the liquid return valve core 3 can realize the connection or cutoff between different chambers in the accommodating cavity. The inductive sensor 41 monitors the signal in real time to determine the position of the liquid return valve core 3. The controller continuously adjusts the state of the liquid inlet valve core 2 according to the feedback signal until the target state is reached. The inductive sensor 41 and the liquid return valve core 3 are set in a non-contact manner to complete the displacement detection of the liquid return valve core 3, which has low space installation requirements and higher flexibility.

[0042] One end of the valve sleeve 1 is connected to a plug 5, and the inductive sensor 41, the plug 5 and the liquid return valve core 3 form a control chamber 10. The plug 5 is arranged at one end of the valve sleeve 1 to seal the valve sleeve 1. At the same time, the plug 5 has an installation position for the inductive sensor 41, which is more convenient to install; the inductive sensor 41 is installed in the control chamber 10, and has sufficient installation space. In this embodiment, the inductive sensor 41 is an LDC inductance digital converter, which uses a PCB coil to realize non-contact inductive coil detection, and realizes position detection by analyzing the influence of the object to be measured on the magnetic field of the inductive coil. Specifically, an alternating current is applied to the PCB coil, and an alternating magnetic field is generated around the coil. When the liquid return valve core 3 moves, eddy currents are generated on the liquid return valve core 3, and the eddy current current is opposite to the current direction of the coil itself, and the magnetic field generated is opposite to the magnetic field generated by the coil. The inductance value of the PCB coil and the eddy current loss of the coil change, and the LDC inductance digital converter reads the data and further processes the measured data to convert the inductance value into a measured distance value. The inductive sensor 41 has only a PCB coil, is not affected by dirt and dust, is not affected by magnets and has higher reliability. It has lower installation space requirements, higher flexibility, and higher resolution, and can achieve sub-micron resolution in position sensing.

[0043] The end of the inductive sensor 41 close to the liquid return valve core 3 is provided with a sealing member 42, and a sealing ring 43 is provided between the inductive sensor 41 and the plug 5. The plug 5 is provided with a groove, and the inductive sensor 41 is installed in the groove. At the same time, one end of the liquid return valve core 3 extends into the groove, and the sealing ring 43 is connected to the side wall of the groove. Since one end of the inductive sensor 41 is arranged in the control chamber 10, a sealing member 42 is provided at one end thereof. The sealing member 42 can be selected as a sealing rubber layer, which covers the end face of the inductive sensor 41 to prevent the inductive sensor 41 from being exposed to the fluid in the control chamber 10 and affecting the sealing performance. In addition, a sealing ring 43 is provided between the inductive sensor 41 and the plug 5 to achieve a sealing effect. The LDC inductance digital converter communicates with the controller through the bus, and further realizes the control of the pilot proportional pressure reducing valve through the solenoid valve drive circuit.

[0044] The inductive sensor 41 is connected with a connector 44, and the connector 44 passes through one side of the plug 5 and is fixed by a fixing member 45. The PCB board power supply line and signal line are led to the outside through the connector 44 and connected to the LDC control circuit board or chip to realize power supply and data signal collection. The fixing member 45 can be selected as a nut or the like.

[0045] The hydraulic valve further comprises a liquid inlet valve seat 6 and a liquid return valve seat 7. The liquid inlet valve seat 6 is connected to the valve sleeve 1 and is movably connected to the liquid inlet valve core 2. The liquid return valve seat 7 is connected to the liquid return valve core 3. The valve sleeve 1, the liquid inlet valve seat 6 and the liquid inlet valve core 2 form a liquid inlet chamber 20. The liquid inlet valve seat 6, the liquid return valve core 3 and the valve sleeve 1 form a liquid return chamber 30. The liquid return valve seat 7 is connected to the liquid return valve core 3 by a screw 71, so that the liquid return valve core 3 is tightly connected to the liquid return valve seat 7 and is not easy to loosen. The side wall of the valve sleeve 1 is sequentially provided with a liquid inlet port 11, a liquid return port 12 and a control port 13. The liquid inlet port 11 is connected to the liquid inlet chamber 20, the liquid return port 12 is connected to the liquid return chamber 30, and the control port 13 is connected to the control chamber 10. The relative positions of the liquid inlet valve core 2 and the liquid return valve core 3 are different, so as to change the connection or cut-off state of the liquid inlet chamber 20 and the liquid return chamber 30.

[0046] The liquid inlet valve core 2 is provided with a liquid inlet passage 40 connected with the liquid inlet chamber 20 along its axial direction, and an elastic member 8 is provided on the outer peripheral side of the liquid inlet valve core 2 to push the liquid inlet valve core 2 to cut off the liquid inlet chamber 20 and the liquid return chamber 30. In this embodiment, the elastic member 8 is a spring and has a certain amount of pre-compression, and a through hole connected with the liquid inlet chamber 20 is provided on the peripheral side of the liquid inlet valve core 2. If the elastic force of the elastic member 8 is greater than the pressure exerted on the liquid return valve core 3 and the liquid return valve seat 7 on the liquid inlet valve core 2, the liquid inlet valve core 2 is pressed against the liquid inlet valve seat 6 under the action of the elastic member 8, and the liquid inlet chamber 20 and the liquid return chamber 30 are mutually cut off; if the elastic force of the elastic member 8 is less than the pressure exerted on the liquid return valve core 3 and the liquid return valve seat 7 on the liquid inlet valve core 2, the liquid inlet valve core 2 moves along one end toward the liquid outlet 14, the liquid inlet chamber 20 and the liquid return chamber 30 are connected, and the fluid entering the hydraulic valve from the liquid inlet 11 flows out through the liquid outlet 14.

[0047] The liquid enters the control chamber 10 along the control port 13, and the pressure in the control chamber 10 increases, pushing the liquid return valve core 3 to move along the valve sleeve 1. When the pressure is large enough, the liquid return valve seat 7 blocks the liquid inlet valve core 2, and the liquid return chamber 30 is cut off from the liquid inlet chamber 20.

[0048] The end of the valve sleeve 1 close to the liquid inlet valve core 2 is connected with a guide sleeve 9, and the guide sleeve 9 is connected to the liquid inlet valve core 2. The liquid outlet 14 is arranged at one end of the guide sleeve 9, and one end of the liquid inlet valve core 2 extends into the guide sleeve 9, which guides the movement of the liquid inlet valve core 2. At the same time, the arrangement of the guide sleeve 9 prevents the liquid inlet valve core 2 from being directly connected to the valve sleeve 1, thereby improving the sealing performance between the liquid inlet valve core 2 and the valve sleeve 1.

[0049] The valve sleeve 1, the plug 5 and the liquid return valve core 3 form a balancing chamber 50, and the balancing chamber 50 is connected to the liquid return chamber 30. A liquid channel is opened along the axial direction of the screw 71, and the balancing chamber 50 is connected to the liquid return chamber 30 through the liquid channel, and the balancing chamber 50 plays the role of a balancing valve core.

[0050] The accommodating chamber is connected with a pilot circuit 100, and the pilot circuit 100 includes a liquid inlet pipeline 101 and a liquid return pipeline 102. The liquid inlet pipeline 101 is connected with the liquid inlet chamber 20 and the control chamber 10, and the liquid return pipeline 102 is connected with the liquid return chamber 30. The pilot circuit 100 is provided to adjust the flow of the hydraulic valve so that it can be continuously adjusted.

[0051] The liquid inlet pipeline 101 is provided with a pressure reducing valve 103 and a pilot proportional pressure reducing valve 104 connected in sequence, and the pilot proportional pressure reducing valve 104 is a two-position three-way pilot proportional pressure reducing valve. A part of the liquid in the liquid inlet pipeline 101 flows into and out of the hydraulic valve through the liquid inlet chamber 20, and a part of the liquid is reduced in pressure by the pressure reducing valve 103, and then the pilot proportional pressure reducing valve 104 adjusts the pressure of the liquid entering the control chamber 10. The pressure reducing valve 103 is a fixed value pressure reducing valve, which ensures the stability of the inlet pressure of the pilot proportional pressure reducing valve 104, and the pilot proportional pressure reducing valve 104 realizes the adjustment of the pressure of the control chamber 10.

[0052] The pilot circuit 100 further includes a relief valve 105 connected to the liquid inlet end of the pressure reducing valve 103. The relief valve 105 plays a role in overflow regulation.

[0053] The working process of the hydraulic valve is as follows:

[0054] The liquid inlet valve core 2 is in a normally closed state under the action of the spring force, and the liquid return valve core 3 is in an open state. The pilot proportional pressure reducing valve 104 is in a normally closed state when it does not receive a control signal. The fluid enters the control chamber 10 through the pressure reducing valve 103 and the pilot proportional pressure reducing valve 104, pushing the liquid return valve core 3 to move. After moving a certain distance, the liquid return valve seat 7 contacts the liquid inlet valve core 2, and the liquid inlet chamber 20 and the liquid return chamber 30 are cut off. At the same time, the liquid return port 12 on the valve sleeve 1 is closed. At this time, the pressure does not reach the opening pressure of the liquid inlet valve core 2. As the pressure in the control chamber 10 continues to rise, after reaching the opening pressure of the liquid inlet valve core 2, the liquid inlet valve core 2 and the liquid return valve core 3 move together, and the liquid inlet chamber 20 is connected to the liquid inlet channel 40. The inductive sensor 41 monitors the signal in real time, and the controller continuously adjusts the state of the liquid inlet valve core 2 according to the feedback signal to achieve the target state. Compared with the liquid return valve core 3 and the liquid inlet valve core 2 which need to be controlled separately, the present solution adopts the method of first pushing the liquid return valve core 3 and then pushing the liquid return valve core 3 and the liquid inlet valve core 2 together, thereby reducing the control amount; the pressure reducing valve 103 and the pilot proportional pressure reducing valve 104 are used to control the liquid return valve core 3 and the liquid inlet valve core 2, which is simple to control and can improve the control accuracy;

[0055] When the liquid inlet valve core 2 and the liquid return valve core 3 need to return to their positions, the control signal of the pilot proportional pressure reducing valve 104 is disconnected, the control chamber 10 is connected with the liquid return chamber 30, the pressure in the control chamber 10 drops, the liquid inlet valve core 2 and the liquid return valve core 3 move toward the plug 5, and after the two are separated, the liquid inlet chamber 20 and the liquid return chamber 30 are connected.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0058] In the description of the present invention, "plurality" means two or more.

[0059] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0060] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 utility model. In this specification, the schematic representation 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 one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic valve, characterized in that: include: A valve sleeve having a receiving cavity; A liquid inlet valve core, slidably disposed in the accommodating cavity; A liquid return valve core is slidably disposed in the accommodating cavity; The position detection component is arranged on a side of the liquid return valve core away from the liquid inlet valve core, and the position detection component includes an inductive sensor.

2. A hydraulic valve according to claim 1, characterized in that: One end of the valve sleeve is connected with a plug, and the inductive sensor, the plug and the liquid return valve core form a control chamber.

3. A hydraulic valve according to claim 2, characterized in that: A sealing member is provided at one end of the inductive sensor close to the liquid return valve core, and a sealing ring is provided between the inductive sensor and the plug.

4. A hydraulic valve according to claim 2, characterized in that: The inductive sensor is connected with a connector, and the connector passes through one side of the plug and is fixed by a fixing piece.

5. A hydraulic valve according to claim 2, characterized in that: The hydraulic valve also includes an inlet valve seat and a return valve seat, the inlet valve seat is connected to the valve sleeve and is movably connected to the inlet valve core, the return valve seat is connected to the return valve core, the valve sleeve, the inlet valve seat and the inlet valve core form an inlet cavity, and the inlet valve seat, the return valve core and the valve sleeve form a return cavity.

6. A hydraulic valve according to claim 5, characterized in that: An elastic member is disposed on the outer peripheral side of the liquid inlet valve core to push the liquid inlet valve core to cut off the liquid inlet cavity and the liquid return cavity.

7. A hydraulic valve according to claim 5, characterized in that: One end of the valve sleeve close to the liquid inlet valve core is connected with a guide sleeve, and the guide sleeve is connected to the liquid inlet valve core.

8. A hydraulic valve according to claim 5, characterized in that: The valve sleeve, the plug and the liquid return valve core form a balance chamber, and the balance chamber is communicated with the liquid return chamber.

9. A hydraulic valve according to claim 5, characterized in that: The accommodating chamber is connected with a pilot circuit, and the pilot circuit includes a liquid inlet pipeline and a liquid return pipeline. The liquid inlet pipeline is connected with the liquid inlet chamber and the control chamber, and the liquid return pipeline is connected with the liquid return chamber.

10. A hydraulic valve according to claim 9, characterized in that: The liquid inlet pipeline is provided with a pressure reducing valve and a pilot proportional pressure reducing valve; The pilot circuit also includes a relief valve connected to the pilot proportional pressure reducing valve.

Images