Overflow valve group and hydraulic system

Abstract

The utility model provides an overflow valve group and a hydraulic system, the overflow valve group comprises an overflow valve and an electromagnetic pilot operated valve, the overflow valve is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet is connected with a liquid source, the first liquid outlet is connected with a liquid return box, the electromagnetic pilot operated valve has a plurality of working states, and the working states of the electromagnetic pilot operated valve are different. The pressure of the first liquid inlet is adjusted by controlling the electromagnetic pilot operated valve to be switched among a plurality of working states. The pressure of the first liquid inlet of the overflow valve is increased by controlling the electromagnetic pilot valve to discharge the liquid into the overflow valve, the pressure of the first liquid inlet of the overflow valve is reduced by controlling the electromagnetic pilot valve to discharge the liquid into the liquid return box, and the pressure of the first liquid inlet can be kept unchanged when the electromagnetic pilot valve is in the cut-off state; when the liquid supply pressure needed by the working face changes, remote adjustment can be achieved, the time consumed for pressure adjustment is saved, and more accurate pressure adjustment can be achieved.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and in particular to an overflow valve assembly and a hydraulic system. Background Technology

[0002] An overflow valve is a pressure regulating device in a hydraulic system, widely used in spray pump stations. The pressure of the high-pressure water required for dust suppression spraying on the working face is regulated by the overflow valve.

[0003] The pressure regulation method of the overflow valve in the existing technology is manual adjustment, thereby controlling the system pressure. However, this method is inconvenient to operate, the set pressure is unstable, and remote adjustment cannot be achieved, which does not meet the requirements of intelligent mining development in coal mines. Utility Model Content

[0004] This disclosure aims to at least solve the technical problems existing in the prior art, such as the inconvenience of operating the control system pressure by manually adjusting it, the unstable pressure setting, and the inability to achieve remote adjustment.

[0005] Therefore, one object of this disclosure is to provide an overflow valve assembly, including an overflow valve and an electromagnetic pilot valve, wherein the overflow valve has a first inlet and a first outlet, the first inlet being connected to a liquid source and the first outlet being connected to a return tank, and the electromagnetic pilot valve having multiple operating states, wherein the pressure of the first inlet is adjusted by controlling the electromagnetic pilot valve to switch between multiple operating states.

[0006] In some embodiments, the electromagnetic pilot valve has a working port, a second inlet port, and a second outlet port. The second inlet port is connected to the first inlet port through a first flow channel, and the second outlet port is connected to the first outlet port through a second flow channel.

[0007] In some embodiments, the operating state includes at least a first operating state and a second operating state. When the electromagnetic pilot valve is switched to the first operating state, the second inlet is connected to the operating port, the second inlet is disconnected from the second outlet, and the operating port is disconnected from the second outlet. When the electromagnetic pilot valve is switched to the second operating state, the operating port is connected to the second outlet, the operating port is disconnected from the second inlet, and the second inlet is disconnected from the second outlet.

[0008] In some embodiments, the electromagnetic pilot valve includes a first electromagnet and a second electromagnet, wherein the first electromagnet is energized to switch the electromagnetic pilot valve to the first operating state, and the second electromagnet is energized to switch the electromagnetic pilot valve to the second operating state.

[0009] In some embodiments, the working state further includes a third working state, in which the first electromagnet and the second electromagnet are de-energized to switch the electromagnetic pilot valve to the third working state. When the electromagnetic pilot valve is switched to the third working state, the second inlet is cut off from the working port, the second inlet is cut off from the second outlet, and the working port is cut off from the second outlet.

[0010] In some embodiments, the overflow valve assembly is connected to a controller, which is configured to switch the electromagnetic pilot valve to the first operating state when the pressure at the first inlet is lower than a first preset threshold, and to switch the electromagnetic pilot valve to the second operating state when the pressure at the first inlet is higher than a second preset threshold.

[0011] In some embodiments, the overflow valve includes a valve body, a first inlet is disposed at the end of the valve body, the first inlet and the first outlet are disposed on the side of the valve body, a first valve cavity is disposed within the valve body, the first inlet and the first outlet are respectively connected to the valve cavity, a movable valve core is disposed within the first valve cavity, and an elastic element is disposed between the valve core and the end of the valve body away from the first inlet.

[0012] In some embodiments, the space between the valve core and the end of the valve body furthest from the first inlet is in communication with the working port.

[0013] In some embodiments, the overflow valve assembly further includes an accumulator connected to the working port.

[0014] Another object of this disclosure is to provide a hydraulic system including the aforementioned relief valve assembly.

[0015] The relief valve assembly and hydraulic system provided in this disclosure have the following beneficial effects:

[0016] This embodiment of the invention is based on controlling the switching of the electromagnetic pilot valve between multiple operating states. The pressure at the first inlet of the overflow valve is increased by discharging liquid into the overflow valve through the electromagnetic pilot valve, and the pressure at the first inlet of the overflow valve is decreased by discharging liquid into the return tank through the electromagnetic pilot valve. It can also keep the pressure at the first inlet constant when the electromagnetic pilot valve is in the closed state. When the required liquid supply pressure of the working surface changes, remote adjustment can be achieved, saving the time consumed by pressure adjustment and achieving more accurate pressure adjustment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overflow valve assembly in an embodiment of this disclosure;

[0019] Figure 2 This is a schematic diagram of the overflow valve in an embodiment of this disclosure.

[0020] Figure label:

[0021] 1. Overflow valve; 11. First inlet; 12. First outlet; 13. Valve body; 14. First valve chamber; 141. Upper valve chamber; 142. Lower valve chamber; 15. Valve core; 16. Elastic element; 17. First flow channel; 18. Second flow channel; 19. Annular groove; 2. Solenoid pilot valve; 21. Working port; 22. Second inlet; 23. Second outlet; 24. First electromagnet; 25. Second electromagnet; 3. Liquid source; 4. Return tank; 5. Accumulator. Detailed Implementation

[0022] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0023] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0024] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0025] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0026] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0027] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0028] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0029] The first embodiment of this disclosure provides an overflow valve assembly, such as Figure 1 As shown, it includes an overflow valve 1 and a solenoid pilot valve 2. The overflow valve 1 has a first inlet 11 and a first outlet 12. The first inlet 11 is connected to the liquid source 3, and the first outlet 12 is connected to the return tank 4.

[0030] Specifically, such as Figure 2 As shown, the overflow valve 1 includes a valve body 13, a first inlet 11 and a first outlet 12 are disposed on the side of the valve body 13, a first valve cavity 14 is disposed inside the valve body 13, the first inlet 11 and the first outlet 12 are respectively connected to the first valve cavity 14, a movable valve core 15 is disposed inside the first valve cavity 14, and an elastic element 16 is disposed between the valve core 15 and the end of the valve body 13 away from the first inlet 11. Taking the vertical configuration of the overflow valve 1 as an example, the first valve chamber 14 is divided into an upper valve chamber 141 and a lower valve chamber 142 by the valve core 15. The upper valve chamber 141 is above the valve core 15, and the lower valve chamber 142 is below the valve core 15. The valve core 15 can move within the first valve chamber 14 under the combined action of the pressure of the upper valve chamber 141 and the pressure of the lower valve chamber 142, so as to change the channel size between the first liquid inlet 11 and the first liquid outlet 12, that is, to adjust the flow rate of the overflow valve 1 flowing into the return tank 4 through the first liquid outlet 12, thereby changing the pressure of the first liquid inlet 11.

[0031] The valve core 15 has an annular groove 19 on its side, which facilitates the connection between the first liquid inlet 11 and the first liquid outlet 12.

[0032] The electromagnetic pilot valve 2 has a working port 21, a second inlet port 22, and a second outlet port 23. The second inlet port 22 is connected to the first inlet port 11 through a first flow channel 17, and the second outlet port 23 is connected to the first outlet port 12 through a second flow channel 18. The space between the valve core 15 and the end of the valve body 13 furthest from the first inlet port 11 is connected to the working port 21 through a second valve chamber within the electromagnetic pilot valve 2, that is, the working port 21 is connected to the upper part (upper valve chamber 141) of the valve core 15. In this embodiment, the connection between the overflow valve 1 and the electromagnetic pilot valve 2 is achieved through the first flow channel 17 and the second flow channel 18. Since the overflow valve 1 and the electromagnetic pilot valve 2 do not directly contact each other, both the first flow channel 17 and the second flow channel 18 include a portion disposed within the overflow valve 1 and a connecting pipe disposed between the overflow valve 1 and the electromagnetic pilot valve 2.

[0033] The first flow channel 17 and the second flow channel 18 here act as dampers, making it easier to control the pressure.

[0034] The electromagnetic pilot valve 2 has multiple operating states. The electromagnetic pilot valve 2 remotely controls the relief valve 1 via a controller, switching between these states to regulate the pressure at the first inlet 11. When the pressure at the first inlet 11 is lower than a first preset threshold, the electromagnetic pilot valve 2 switches to the first operating state; when the pressure at the first inlet 11 is higher than a second preset threshold, the electromagnetic pilot valve 2 switches to the second operating state. Here, the first and second preset thresholds refer to pre-set pressure values ​​at the first inlet 11 to maintain system stability.

[0035] Specifically, the operating states of the electromagnetic pilot valve 2 include a first operating state. If the pressure at the first inlet 11 is too low (below the first preset threshold), the pressure at the first inlet 11 needs to be increased, and the electromagnetic pilot valve 2 switches to the first operating state. In the first operating state, the second inlet 22 is connected to the working port 21, the second inlet 22 is cut off from the second outlet 23, and the working port 21 is cut off from the second outlet 23. At this time, the liquid flows from the first inlet 11 and the first flow channel 17 of the overflow valve 1 to the second inlet 22 of the electromagnetic pilot valve 2, and enters the upper part of the valve core 15 (upper valve chamber 141) through the working port 21. This causes the pressure above the valve core 15 (upper valve chamber 141) to be greater than the pressure below the valve core 15 (lower valve chamber 142). The valve core 15 moves downward, which reduces the channel between the first inlet 11 and the first outlet 12. The amount of liquid flowing back to the return tank 4 from the first outlet 12 decreases, thereby increasing the pressure at the first inlet 11 and achieving the regulation of the pressure at the first inlet 11.

[0036] The electromagnetic pilot valve 2 has a second operating state. If the pressure at the first inlet 11 is too high (above the second preset threshold), the pressure at the first inlet 11 needs to be reduced, and the electromagnetic pilot valve 2 switches to the second operating state. In the second operating state, the working port 21 is connected to the second outlet 23, and the working port 21 is cut off from the second inlet 22, and the second inlet 22 is cut off from the second outlet 23. At this time, liquid will not enter the electromagnetic pilot valve 2 from the first inlet 11, but the liquid in the second valve chamber of the electromagnetic pilot valve 2 flows from the working port 21 of the electromagnetic pilot valve 2 through the second outlet 23, and then flows through the second flow channel 18 to the first outlet 12 of the overflow valve 1. Since the first outlet 12 is connected to the return tank 4, the liquid in the second valve chamber of the electromagnetic pilot valve 2 is depressurized. Since the second valve chamber of the electromagnetic pilot valve 2 is connected to the upper valve chamber 141, the pressure in the upper valve chamber 141 decreases. When the pressure in the upper valve chamber 141 is less than the pressure in the lower valve chamber 142, the valve core 15 moves upward, which enlarges the channel between the first liquid inlet 11 and the first liquid outlet 12. This increases the amount of liquid flowing back to the return tank 4 from the first liquid outlet 12, thereby reducing the pressure in the first liquid inlet 11 and achieving the regulation of the pressure in the first liquid inlet 11.

[0037] The electromagnetic pilot valve 2 also has a third operating state. When the electromagnetic pilot valve 2 switches to the third operating state, the second inlet port 22 is cut off from the working port 21, the second inlet port 22 is cut off from the second outlet port 23, and the working port 21 is cut off from the second outlet port 23. At this time, the second inlet port 22, the second outlet port 23, and the working port 21 of the electromagnetic pilot valve 2 are not connected to the relief valve 1. The electromagnetic pilot valve 2 will not adjust the pressure of the first inlet port 11 of the relief valve 1, and the relief valve 1 achieves pressure maintenance, with the pressure of the first inlet port 11 remaining unchanged.

[0038] The operating state of the electromagnetic pilot valve 2 is achieved through the first electromagnet 24 and the second electromagnet 25. Specifically, the controller controls the first electromagnet 24 to be energized to switch the electromagnetic pilot valve 2 to the first operating state, the controller controls the second electromagnet 25 to be energized to switch the electromagnetic pilot valve 2 to the second operating state, and the controller controls the first electromagnet 24 and the second electromagnet 25 to be de-energized to switch the electromagnetic pilot valve 2 to the third operating state.

[0039] For example, the electromagnetic pilot valve 2 is a three-position three-way electromagnetic pilot valve.

[0040] In this embodiment, the pressure regulation of the relief valve 11 is achieved remotely through the electromagnetic pilot valve 2. When the electromagnetic pilot valve 2 is in the first working state, the pressure at the first inlet 11 of the relief valve 1 is increased; when the electromagnetic pilot valve 2 is in the second working state, the pressure at the first inlet 11 of the relief valve 1 is decreased; when the electromagnetic pilot valve 2 is in the third working state, the passage between the electromagnetic pilot valve 2 and the relief valve 1 is cut off, and the pressure at the first inlet 11 of the relief valve 1 remains unchanged. By setting the electromagnetic pilot valve 2, remote adjustment can be achieved when the required liquid supply pressure at the working surface changes, saving the time required for pressure adjustment of the relief valve 1. Furthermore, it is more accurate, convenient, and faster than manual pressure adjustment.

[0041] In addition, the overflow valve assembly also includes an accumulator 5 connected to the working port 21. When the instantaneous pressure in the second valve chamber of the electromagnetic pilot valve 2 increases, the accumulator 5 converts the energy in the pipeline system into compressive energy or potential energy and stores it. When the instantaneous pressure in the second valve chamber of the electromagnetic pilot valve 2 decreases, the accumulator 5 converts the compressive energy or potential energy into hydraulic or pneumatic energy and releases it to replenish the system, so as to play a role in stabilizing the pressure and ensuring that the pressure of the entire system is normal.

[0042] In this embodiment, liquid source 3 refers to a device that supplies liquid to the overflow valve assembly, such as a water tank. Liquid source 3 delivers liquid to overflow valve 1 via a liquid pressurization device, such as a hydraulic pump.

[0043] Furthermore, a pressure measuring device, such as a pressure sensor, is installed on the pipeline between the liquid booster and the overflow valve 1. Specifically, when the pressure value measured by the pressure sensor is less than a first preset threshold, the electromagnetic pilot valve 2 is controlled to switch to a first operating state, increasing the pressure at the first inlet 11 of the overflow valve 1; when the pressure value measured by the pressure sensor is greater than a second preset threshold, the electromagnetic pilot valve 2 is controlled to switch to a second operating state, decreasing the pressure at the first inlet 11 of the overflow valve 11. The second preset threshold is not less than the first preset threshold. By setting a pressure measuring device to obtain the pressure value in the pipeline in real time, and then determining the operating requirements of the overflow valve assembly, pressure regulation in the pipeline can be achieved quickly and accurately.

[0044] Based on the same inventive concept as the first embodiment, the second embodiment of this disclosure provides a hydraulic system including the above-described relief valve assembly.

[0045] In the description of this disclosure, 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 disclosure and simplifying the description, and do not 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 disclosure.

[0046] In the description of this disclosure, "first feature" and "second feature" may include one or more of the features.

[0047] In the description of this disclosure, "multiple" means two or more.

[0048] In the description of this disclosure, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0049] In the description of this disclosure, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0050] In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. 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.

[0051] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A spill valve group, characterized in that, The overflow valve group comprises an overflow valve and an electromagnetic pilot valve, the overflow valve has a first inlet and a first outlet, the first inlet is connected with a liquid source, the first outlet is connected with a return tank, the electromagnetic pilot valve comprises a plurality of working states, the pressure of the first inlet is adjusted by controlling the electromagnetic pilot valve to switch between the plurality of working states.

2. The overflow valve group according to claim 1, characterized in that The electromagnetic pilot valve has a working port, a second inlet and a second outlet, the second inlet is communicated with the first inlet through a first flow channel, the second outlet is communicated with the first outlet through a second flow channel.

3. The overflow valve group according to claim 2, characterized in that The working states at least comprise a first working state and a second working state, when the electromagnetic pilot valve is switched to the first working state, the second inlet is communicated with the working port, the second inlet is cut off with the second outlet, the working port is cut off with the second outlet; when the electromagnetic pilot valve is switched to the second working state, the working port is communicated with the second outlet, the working port is cut off with the second inlet, the second inlet is cut off with the second outlet.

4. The overflow valve group according to claim 3, characterized in that The electromagnetic pilot valve comprises a first electromagnet and a second electromagnet, the first electromagnet is controlled to be electrified to switch the electromagnetic pilot valve to the first working state, the second electromagnet is controlled to be electrified to switch the electromagnetic pilot valve to the second working state.

5. The overflow valve group according to claim 4, characterized in that The working states further comprise a third working state, the first electromagnet and the second electromagnet are controlled to be de-energized to switch the electromagnetic pilot valve to the third working state, when the electromagnetic pilot valve is switched to the third working state, the second inlet is cut off with the working port, the second inlet is cut off with the second outlet, the working port is cut off with the second outlet.

6. The overflow valve group according to claim 4, characterized in that The overflow valve group is connected with a controller, the controller is configured to switch the electromagnetic pilot valve to the first working state when the pressure of the first inlet is lower than a first preset threshold, and switch the electromagnetic pilot valve to the second working state when the pressure of the first inlet is higher than a second preset threshold.

7. The group of overflow valves according to claim 5, characterized in that The overflow valve comprises a valve body, the first inlet and the first outlet are arranged on the side of the valve body, a first valve cavity is arranged in the valve body, the first inlet and the first outlet are communicated with the valve cavity respectively, a movable valve core is arranged in the first valve cavity, an elastic member is arranged between the valve core and the end of the valve body far away from the first inlet.

8. The overflow valve group according to claim 7, characterized in that The space between the valve core and the end of the valve body far away from the first inlet is communicated with the working port.

9. The group of overflow valves according to claim 2, characterized in that, The overflow valve group further comprises an accumulator, the accumulator is communicated with the working port.

10. A hydraulic system characterized by, The overflow valve group comprises the overflow valve group according to any one of claims 1-9.

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