A hydraulic valve flow resistance detection system

Abstract

The present disclosure provides a hydraulic valve flow resistance detection system, comprising: a metering pump; a hydraulic valve, the liquid inlet end of the hydraulic valve is connected to the liquid outlet end of the metering pump; a damping channel, the liquid inlet end of the damping channel is connected to the liquid outlet end of the metering pump; a relief valve, the liquid inlet end of the relief valve is connected to the liquid outlet end of the damping channel; a driving member, the power output end of the driving member is connected to the relief pressure regulating end of the relief valve; a control device, the signal output end of the control device is electrically connected to the signal input end of the driving member. In a hydraulic valve flow resistance detection system of the present disclosure, the control device controls the driving member to adjust the liquid flow rate in the damping channel by adjusting the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve at the rated flow rate. The operation is simple and the adjustment accuracy is high, effectively improving the accuracy of the hydraulic valve flow resistance test and ensuring the accurate judgment of the performance of the hydraulic valve.

Description

Technical Field

[0001] The present disclosure relates to the technical field of flow resistance detection, and in particular to a flow resistance detection system for a hydraulic valve. Background Art

[0002] A hydraulic valve is a core hydraulic component of a mechanical device, and its working characteristics directly affect the operating performance of the mechanical device. Therefore, it is necessary to perform a flow resistance test on the hydraulic valve to determine whether the performance of the hydraulic valve meets the requirements.

[0003] In the flow resistance test, a hydraulic pump transports a liquid to the hydraulic valve and adjusts the flow rate of the hydraulic valve to the rated flow rate to detect the flow resistance of the hydraulic valve. For a fixed-displacement pump with an unadjustable flow rate, it is necessary to set up a throttle valve or other valve bodies for flow diversion. However, since the flow rate of the throttle valve or other valve bodies is not easy to control, it is difficult to control the flow rate of the hydraulic valve at the rated flow rate, resulting in inaccurate results of the flow resistance test. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, the purpose of the present disclosure is to provide a flow resistance detection system for a hydraulic valve.

[0006] To achieve the above object, the present disclosure provides a flow resistance detection system for a hydraulic valve, including: a fixed-displacement pump; a hydraulic valve, the liquid inlet end of the hydraulic valve is connected to the liquid outlet end of the fixed-displacement pump; a damping channel, the liquid inlet end of the damping channel is connected to the liquid outlet end of the fixed-displacement pump; a relief valve, the liquid inlet end of the relief valve is connected to the liquid outlet end of the damping channel; a driving member, the power output end of the driving member is connected to the relief pressure adjusting end of the relief valve; a control device, the signal output end of the control device is electrically connected to the signal input end of the driving member, and the control device is used to control the driving member to adjust the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve at the rated flow rate.

[0007] Optionally, the flow resistance detection system for a hydraulic valve further includes: a flow sensor, the flow sensor is arranged on the pipeline connecting the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed-displacement pump; wherein, the signal input end of the control device is electrically connected to the signal output end of the flow sensor, and the control device controls the driving member according to the liquid flow rate between the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed-displacement pump, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve at the rated flow rate.

[0008] Optionally, the hydraulic valve flow resistance detection system further includes: a first pressure sensor disposed on the pipeline connecting the liquid inlet end of the hydraulic valve and the liquid outlet end of the metering pump; a second pressure sensor disposed on the pipeline at the liquid outlet end of the hydraulic valve; wherein, the signal input end of the control device is electrically connected to the signal output end of the first pressure sensor and the signal output end of the second pressure sensor respectively, and the control device obtains the flow resistance of the hydraulic valve according to the liquid pressure between the liquid inlet end of the hydraulic valve and the liquid outlet end of the metering pump and the liquid pressure at the liquid outlet end of the hydraulic valve.

[0009] Optionally, the control device includes: a data acquisition card, the signal input end of the data acquisition card is electrically connected to the signal output end of the flow sensor, the signal output end of the first pressure sensor and the signal output end of the second pressure sensor respectively; a computer, the signal input end of the computer is electrically connected to the signal output end of the data acquisition card, and the signal output end of the computer is electrically connected to the signal input end of the driving member.

[0010] Optionally, the overflow valve includes: a valve body, a first chamber, a second chamber and a liquid passing channel are arranged in the valve body, liquid inlet ports and liquid outlet ports are arranged at one ends of the first chamber and the second chamber respectively, the liquid inlet port of the first chamber is connected to the liquid outlet end of the damping channel, the liquid inlet end of the liquid passing channel is connected to the liquid inlet port of the first chamber, and the liquid outlet end of the liquid passing channel is connected to the other end of the first chamber and the liquid inlet port of the second chamber respectively; a first valve core slidably disposed in the first chamber; a first spring disposed between the first valve core and the chamber wall of the first chamber, the first spring enabling the first valve core to cut off the passage between the liquid inlet port and the liquid outlet port of the first chamber; a second valve core slidably disposed in the second chamber; a second spring disposed between the second valve core and the power output end of the driving member, the second spring enabling the second valve core to cut off the passage between the liquid inlet port and the liquid outlet port of the second chamber, and the driving member is used for adjusting the compression amount of the second spring.

[0011] Optionally, the overflow valve further includes: a guide sleeve slidably disposed in the second chamber, one end of the guide sleeve is connected to the end of the second spring away from the second valve core, the other end of the guide sleeve is threadedly connected to the power output end of the driving member, and the power output end of the driving member rotates to adjust the compression amount of the second spring.

[0012] Optionally, the overflow valve further includes: a solenoid valve, the liquid inlet end of the solenoid valve is connected to the liquid outlet end of the liquid passing channel.

[0013] Optionally, the hydraulic valve flow resistance detection system further includes: a safety valve, the liquid inlet end of the safety valve is connected to the liquid outlet end of the metering pump.

[0014] Optionally, the hydraulic valve flow resistance detection system further includes: a check valve, the liquid inlet end of the check valve is connected to the liquid outlet end of the metering pump, and the liquid outlet end of the check valve is respectively connected to the liquid inlet end of the hydraulic valve and the liquid inlet end of the damping channel.

[0015] Optionally, the hydraulic valve flow resistance detection system further includes: a liquid storage tank, the liquid outlet end of the liquid storage tank is connected to the liquid inlet end of the metering pump, and the liquid inlet end of the liquid storage tank is respectively connected to the liquid outlet end of the hydraulic valve and the liquid outlet end of the overflow valve.

[0016] The technical solution provided by the present disclosure may include the following beneficial effects:

[0017] The metering pump pressurizes and conveys the liquid into the hydraulic valve so that the hydraulic valve can perform a flow resistance test. At the same time, a part of the liquid discharged from the metering pump enters the overflow valve after passing through the damping channel for diversion, that is, when the liquid pressure is greater than the overflow pressure of the overflow valve, the overflow valve discharges a part of the liquid discharged from the metering pump, so that the liquid flow rate at the liquid outlet end of the metering pump can meet the needs of the hydraulic valve flow resistance test; wherein, the control device controls the driving member to adjust the liquid flow rate in the damping channel by adjusting the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel, thereby maintaining the liquid flow rate at the liquid inlet end of the hydraulic valve at the rated flow rate. The operation is simple and the adjustment accuracy is high, effectively improving the accuracy of the hydraulic valve flow resistance test and ensuring an accurate judgment of the performance of the hydraulic valve.

[0018] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. Description of the Drawings

[0019] The above-mentioned and / or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0020] Figure 1 is a schematic structural diagram of a hydraulic valve flow resistance detection system proposed by an embodiment of the present disclosure;

[0021] Figure 2 is a cross-sectional view of an overflow valve in a hydraulic valve flow resistance detection system proposed by an embodiment of the present disclosure;

[0022] Figure 3 is a partial cross-sectional view of an overflow valve in a hydraulic valve flow resistance detection system proposed by an embodiment of the present disclosure;

[0023] As shown in the figure: 1. Quantitative pump, 2. Hydraulic valve, 3. Relief valve, 4. Driving part, 5. Damping channel, 6. Flow sensor, 7. First pressure sensor, 8. Second pressure sensor, 9. Data acquisition card, 10. Computer, 11. Valve body, 12. First chamber, 13. Second chamber, 14. Liquid passing channel, 15. First spool, 16. First spring, 17. Second spool, 18. Second spring, 19. Guide sleeve, 20. Solenoid valve, 21. Safety valve, 22. Check valve, 23. Liquid storage tank. Detailed implementation manners

[0024] The embodiments of the present disclosure will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present disclosure and should not be construed as a limitation of the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0025] As Figure 1 shown, an embodiment of the present disclosure provides a flow resistance detection system for a hydraulic valve 2, including a quantitative pump 1, a hydraulic valve 2, a damping channel 5, a relief valve 3, a driving part 4, and a control device. The liquid inlet end of the hydraulic valve 2 is connected to the liquid outlet end of the quantitative pump 1. The liquid inlet end of the damping channel 5 is connected to the liquid outlet end of the quantitative pump 1. The liquid inlet end of the relief valve 3 is connected to the liquid outlet end of the damping channel 5. The power output end of the driving part 4 is connected to the relief pressure adjusting end of the relief valve 3. The signal output end of the control device is electrically connected to the signal input end of the driving part 4. The control device is used to control the driving part 4 to adjust the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel 5, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve 2 at a rated flow rate.

[0026] It can be understood that the quantitative pump 1 pressurizes and conveys the liquid into the hydraulic valve 2 so that the hydraulic valve 2 can perform a flow resistance test. At the same time, a part of the liquid discharged from the quantitative pump 1 enters the relief valve 3 after passing through the damping channel 5 for diversion. That is, when the liquid pressure is greater than the relief pressure of the relief valve 3, the relief valve 3 discharges a part of the liquid discharged from the quantitative pump 1, so that the liquid flow rate at the liquid outlet end of the quantitative pump 1 can meet the requirements of the flow resistance test of the hydraulic valve 2.

[0027] Among them, the control device controls the driving part 4 to adjust the liquid flow rate in the damping channel 5 by adjusting the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel 5, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve 2 at a rated flow rate. The operation is simple and the adjustment accuracy is high, effectively improving the accuracy of the flow resistance test of the hydraulic valve 2 and ensuring an accurate judgment of the performance of the hydraulic valve 2.

[0028] It should be noted that the liquid flow rate q in the damping channel 5 is as follows:

[0029]

[0030] where C d is the flow coefficient of the damping channel 5, A0 is the cross-sectional area of the damping channel 5, ρ is the density of the liquid in the damping channel 5, Δp is the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel 5, Δp = p1 - p2, p1 is the liquid pressure at the liquid inlet end of the damping channel 5, and p2 is the liquid pressure at the liquid outlet end of the damping channel 5.

[0031] Since the displacement of the fixed-displacement pump 1 is fixed, by controlling the liquid pressure p2 at the liquid outlet end of the damping channel 5, the liquid pressure difference Δp between the liquid inlet end and the liquid outlet end of the damping channel 5 can be controlled. And by controlling the driving member 4 to adjust the overflow pressure of the overflow valve 3, the liquid pressure p2 at the liquid outlet end of the damping channel 5 can be controlled. Moreover, since the flow coefficient C d of the damping channel 5, the cross-sectional area A0 of the damping channel 5, and the density ρ of the liquid in the damping channel 5 are all fixed values, therefore, by controlling the liquid pressure difference Δp between the liquid inlet end and the liquid outlet end of the damping channel 5, the liquid flow rate q in the damping channel 5 can be linearly adjusted.

[0032] where the flow coefficient C d of the damping channel 5 can be determined by experimental calculation, and the flow coefficient C d is equal to the product of the velocity coefficient of the damping channel 5 and the cross-sectional contraction coefficient of the damping channel 5.

[0033] For the fixed-displacement pump 1, when the pump shaft rotates one week, the volume (displacement) of the liquid discharged by the pump remains unchanged. The fixed-displacement pump 1 is driven by an electric motor, and the electric motor is powered by an external power supply. Among them, the external power supply outputs three-phase electricity to the electric motor.

[0034] The liquid can be an emulsion, then the fixed-displacement pump 1 is an emulsion pump. The emulsion pump is usually the fixed-displacement pump 1, which cannot adjust the flow rate, and the nominal flow rate of the emulsion pump is relatively large, for example: 1250 L / min. Therefore, the overflow valve 3 not only plays a role in adjusting the flow rate, but also plays a role in diverting the flow. Among them, the nominal flow rate refers to the maximum flow rate of the fluid flowing through a certain cross-section per unit time under the rated working conditions.

[0035] The liquid can also be other media, such as: hydraulic oil, etc.

[0036] As Figure 1 shown, in some embodiments, the hydraulic valve 2 flow resistance detection system further includes a flow sensor 6, and the flow sensor 6 is arranged on the pipeline between the liquid inlet end of the hydraulic valve 2 and the connection of the outlet end of the fixed-displacement pump 1;

[0037] Among them, the signal input end of the control device is electrically connected to the signal output end of the flow sensor 6. The control device controls the driving member 4 according to the liquid flow rate between the liquid inlet end of the hydraulic valve 2 and the liquid outlet end of the metering pump 1, so that the liquid flow rate at the liquid inlet end of the hydraulic valve 2 is maintained at the rated flow rate.

[0038] It can be understood that the flow sensor 6 detects the liquid flow rate between the liquid inlet end of the hydraulic valve 2 and the liquid outlet end of the metering pump 1, and the flow sensor 6 converts the detected liquid flow rate into a flow electrical signal and sends it to the control device. When the control device controls the driving member 4 to adjust the liquid flow rate at the liquid inlet end of the hydraulic valve 2, it monitors the liquid flow rate at the liquid inlet end of the hydraulic valve 2 through the flow electrical signal output by the flow sensor 6, so that the liquid flow rate at the liquid inlet end of the hydraulic valve 2 can accurately reach the rated flow rate of the hydraulic valve 2, thereby ensuring an accurate flow resistance test for the hydraulic valve 2.

[0039] It should be noted that the control device can directly establish a mathematical model between the action amount of the driving member 4 and the liquid flow rate at the liquid inlet end of the hydraulic valve 2 to accurately adjust the liquid flow rate at the liquid inlet end of the hydraulic valve 2 by controlling the driving member 4. However, this method is suitable for working conditions where the component models such as the metering pump 1 and the hydraulic valve 2 are fixed. If there are many working conditions that require flow resistance tests, more mathematical models need to be established, resulting in a higher cost for the flow resistance test of the hydraulic valve 2.

[0040] It can also be based on a feedback method, that is, using the above-mentioned flow sensor 6, taking the liquid flow rate at the liquid inlet end of the hydraulic valve 2 as the target value, and using control algorithms such as the PID (Proportional-Integral-Differential) neural network control algorithm to control the driving member 4, so as to accurately adjust the liquid flow rate at the liquid inlet end of the hydraulic valve 2 by controlling the driving member 4.

[0041] Such as Figure 1 As shown, in some embodiments, the flow resistance detection system of the hydraulic valve 2 further includes a first pressure sensor 7 and a second pressure sensor 8. The first pressure sensor 7 is arranged on the pipeline connecting the liquid inlet end of the hydraulic valve 2 and the liquid outlet end of the metering pump 1, and the second pressure sensor 8 is arranged on the pipeline at the liquid outlet end of the hydraulic valve 2;

[0042] Among them, the signal input end of the control device is electrically connected to the signal output end of the first pressure sensor 7 and the signal output end of the second pressure sensor 8 respectively. The control device obtains the flow resistance of the hydraulic valve 2 according to the liquid pressure between the liquid inlet end of the hydraulic valve 2 and the liquid outlet end of the metering pump 1 and the liquid pressure at the liquid outlet end of the hydraulic valve 2.

[0043] It can be understood that the first pressure sensor 7 detects the liquid pressure at the liquid inlet end of the hydraulic valve 2, and the first pressure sensor 7 converts the detected liquid pressure into a pressure electrical signal and sends it to the control device. The second pressure sensor 8 detects the liquid pressure at the liquid outlet end of the hydraulic valve 2, and the second pressure sensor 8 converts the detected liquid pressure into a pressure electrical signal and sends it to the control device. The control device can obtain the flow resistance of the hydraulic valve 2 based on the pressure electrical signals sent by the first pressure sensor 7 and the second pressure sensor 8, thereby realizing the flow resistance test of the hydraulic valve 2.

[0044] It should be noted that the flow resistance of the hydraulic valve 2 is the ratio of the difference between the liquid pressure at the liquid inlet end of the hydraulic valve 2 and the liquid pressure at the liquid outlet end of the hydraulic valve 2 to the liquid linear velocity passing through the hydraulic valve 2 under a stable liquid flow rate.

[0045] The specific types of the flow sensor 6, the first pressure sensor 7, and the second pressure sensor 8 can be set according to actual needs and are not limited here.

[0046] As Figure 1 shown, in some embodiments, the control device includes a data acquisition card 9 and a computer 10. The signal input ends of the data acquisition card 9 are electrically connected to the signal output ends of the flow sensor 6, the first pressure sensor 7, and the second pressure sensor 8 respectively. The signal input end of the computer 10 is electrically connected to the signal output end of the data acquisition card 9, and the signal output end of the computer 10 is electrically connected to the signal input end of the driving member 4.

[0047] It can be understood that the flow electrical signal output by the flow sensor 6, the pressure electrical signal output by the first pressure sensor 7, and the pressure electrical signal output by the second pressure sensor 8 are all sent to the computer 10 through the data acquisition card 9. The computer 10 controls the driving member 4 according to the received flow electrical signal to keep the liquid flow rate at the liquid inlet end of the hydraulic valve 2 at the rated flow rate. At the same time, the computer 10 processes and calculates according to the received pressure electrical signal to obtain the flow resistance of the hydraulic valve 2.

[0048] It should be noted that the data acquisition card 9 is an expansion card of the computer 10 that realizes the data acquisition function. It has connection ports adapted to the flow sensor 6, the first pressure sensor 7, and the second pressure sensor 8, and is electrically connected to the computer 10 through a bus.

[0049] As Figure 2 and Figure 3As shown, in some embodiments, the overflow valve 3 includes a valve body 11, a first valve core 15, a first spring 16, a second valve core 17, and a second spring 18. A first chamber 12, a second chamber 13, and a liquid passage 14 are provided inside the valve body 11. An inlet and an outlet are provided at one end of the first chamber 12 and one end of the second chamber 13. The inlet of the first chamber 12 is connected to the outlet end of the damping passage 5. The inlet end of the liquid passage 14 is connected to the inlet of the first chamber 12. The outlet end of the liquid passage 14 is connected to the other end of the first chamber 12 and the inlet of the second chamber 13 respectively. The first valve core 15 is slidably disposed inside the first chamber 12. The first spring 16 is disposed between the first valve core 15 and the chamber wall of the first chamber 12. The first spring 16 blocks the passage between the inlet and the outlet of the first chamber 12 by the first valve core 15. The second valve core 17 is slidably disposed inside the second chamber 13. The second spring 18 is disposed between the second valve core 17 and the power output end of the driving member 4. The second spring 18 blocks the passage between the inlet and the outlet of the second chamber 13 by the second valve core 17. The driving member 4 is used to adjust the compression amount of the second spring 18.

[0050] It can be understood that part of the liquid discharged from the damping passage 5 enters one end of the first valve core 15 inside the first chamber 12 through the inlet of the first chamber 12. Part of the liquid discharged from the damping passage 5 enters the other end of the first valve core 15 inside the first chamber 12 after passing through the inlet of the first chamber 12 and the liquid passage 14 in sequence, so that the pressures at both ends of the first valve core 15 inside the first chamber 12 are balanced. And due to the action of the first spring 16, the first valve core 15 does not move, and the passage between the inlet and the outlet of the first chamber 12 is blocked. At the same time, part of the liquid discharged from the damping passage 5 enters the inlet of the second chamber 13 after passing through the inlet of the first chamber 12 and the liquid passage 14 in sequence. And under the action of the second spring 18, the first valve core 15 does not move, and the passage between the inlet and the outlet of the second chamber 13 is blocked.

[0051] When the liquid pressure at the outlet of the damping passage 5 is too high, the liquid pressure at the inlet of the second chamber 13 overcomes the elastic force of the second spring 18 to move the second valve core 17. The movement of the second valve core 17 makes the inlet and the outlet of the second chamber 13 communicate. Since the inlet of the second chamber 13 is connected to the first chamber 12 through the outlet end of the liquid passage 14, the liquid pressure at one end of the first valve core 15 close to the inlet inside the first chamber 12 is much greater than the liquid pressure at the end of the first valve core 15 far from the inlet, so that the liquid pressure at the inlet of the first chamber 12 overcomes the elastic force of the first spring 16 to move the first valve core 15. The movement of the first valve core 15 makes the inlet and the outlet of the first chamber 12 communicate, thereby realizing pressure relief and flow diversion.

[0052] When the outlet liquid pressure of the damping channel 5 is too small, the elastic force of the second spring 18 resets the second valve core 17, and the second valve core 17 cuts off the passage between the liquid inlet of the second chamber 13 and the liquid outlet of the second chamber 13. The elastic force of the first spring 16 resets the first valve core 15, and the first valve core 15 cuts off the passage between the liquid inlet of the first chamber 12 and the liquid outlet of the second chamber 13.

[0053] The driving member 4 is actuated to adjust the compression amount of the second spring 18 , thereby adjusting the liquid pressure that can overcome the elastic force of the second spring 18 , thereby achieving liquid flow regulation at the liquid inlet end of the hydraulic valve 2 .

[0054] It should be noted that the diameter of the second chamber 13 is smaller than the diameter of the first chamber 12, and the diameter of the liquid passage 14 is smaller than the diameter of the second chamber 13. A damping hole with a smaller diameter may be provided in the liquid passage 14 to ensure that when the liquid inlet and the liquid outlet of the second chamber 13 are connected, the liquid pressure at the end of the first valve core 15 close to the liquid inlet is much greater than the liquid pressure at the end of the first valve core 15 away from the liquid inlet. The sizes of the first chamber 12, the second chamber 13 and the liquid passage 14 can be set according to actual needs and are not limited here.

[0055] The second valve core 17 can realize the blocking and connection of the passage between the liquid inlet of the second chamber 13 and the liquid outlet of the second chamber 13 through the ceramic ball.

[0056] Since the force for adjusting the expansion and contraction amount of the second spring 18 is small and the action area is small, it is convenient to select the driving member 4 and can effectively reduce the volume of the relief valve 3. The driving member 4 can be arranged on the relief valve 3 by fixing members such as bolts, and the driving member 4 can be a motor such as a stepping motor, a servo motor, or can be driven by a proportional electromagnet.

[0057] like Figure 3 As shown, in some embodiments, the relief valve 3 also includes a guide sleeve 19, which is slidably disposed in the second chamber 13, one end of the guide sleeve 19 is connected to an end of the second spring 18 away from the second valve core 17, and the other end of the guide sleeve 19 is threadedly connected to the power output end of the driving member 4, and the power output end of the driving member 4 rotates to adjust the compression amount of the second spring 18.

[0058] It can be understood that the power output end of the driving member 4 rotates to move the guide sleeve 19 in the second chamber 13. Since the second spring 18 is arranged between the second valve core 17 and the guide sleeve 19, the linear adjustment of the compression amount of the second spring 18 is achieved.

[0059] It should be noted that the power output end of the driving member 4 is inserted from the outside of the valve body 11 into the second chamber 13, and a sealing member should be provided at the insertion location.

[0060] like Figure 2As shown, in some embodiments, the overflow valve 3 further includes a solenoid valve 20, and the liquid inlet end of the solenoid valve 20 is connected to the liquid outlet end of the liquid passage 14.

[0061] It can be understood that when the metering pump 1 is turned on, the solenoid valve 20 is opened, and the liquid discharged from the metering pump 1 sequentially passes through the damping passage 5, the liquid inlet of the first chamber 12, the liquid passage 14, and the solenoid valve 20 and then is discharged, so as to realize the no-load start of the metering pump 1 and prevent the metering pump 1 from causing a large impact on the motor, power grid, etc. that drive the operation of the metering pump 1 due to insufficient starting power.

[0062] After the metering pump 1 starts with no load, the solenoid valve 20 is closed, so that the overflow valve 3 plays a role in regulating the flow rate and relieving pressure and diverting the flow.

[0063] It should be noted that the solenoid valve 20 can be an electromagnetic switching valve or other valves such as a pilot-operated solenoid valve.

[0064] As Figure 1 shown, in some embodiments, the hydraulic valve 2 flow resistance detection system further includes a safety valve 21, and the liquid inlet end of the safety valve 21 is connected to the liquid outlet end of the metering pump 1.

[0065] It can be understood that due to the setting of the damping passage 5, when the liquid pressure between the liquid outlet end of the metering pump 1 and the liquid inlet end of the hydraulic valve 2 is too high, it cannot be quickly relieved through the overflow valve 3. Therefore, through the setting of the safety valve 21, it can be avoided that the liquid pressure between the liquid outlet end of the metering pump 1 and the liquid inlet end of the hydraulic valve 2 is too high, and the stable and safe operation of the hydraulic valve 2 flow resistance test system is ensured.

[0066] As Figure 1 shown, in some embodiments, the hydraulic valve 2 flow resistance detection system further includes a check valve 22, the liquid inlet end of the check valve 22 is connected to the liquid outlet end of the metering pump 1, and the liquid outlet end of the check valve 22 is respectively connected to the liquid inlet end of the hydraulic valve 2 and the liquid inlet end of the damping passage 5.

[0067] It can be understood that through the one-way conduction characteristic of the check valve 22, the liquid is prevented from flowing back from the hydraulic valve 2 or the damping passage 5 into the metering pump 1, and the stable operation of the hydraulic valve 2 flow resistance test system is ensured.

[0068] As Figure 1 shown, in some embodiments, the hydraulic valve 2 flow resistance detection system further includes a liquid storage tank 23, the liquid outlet end of the liquid storage tank 23 is connected to the liquid inlet end of the metering pump 1, and the liquid inlet end of the liquid storage tank 23 is respectively connected to the liquid outlet end of the hydraulic valve 2 and the liquid outlet end of the overflow valve 3.

[0069] It can be understood that through the setting of the liquid storage tank 23, the liquid supply to the metering pump 1 and the liquid return of the hydraulic valve 2 and the overflow valve 3 are realized, and the stable operation of the hydraulic valve 2 flow resistance test system is ensured.

[0070] It should be noted that the liquid inlet end of the liquid storage tank 23 is also connected to the liquid outlet end of the solenoid valve 20, the liquid outlet of the first chamber 12, and the liquid outlet of the second chamber 13.

[0071] In the description of the present disclosure, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0072] Any process or method description shown in the flowchart or described in other ways herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present disclosure includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed. This should be understood by those skilled in the technical field to which the embodiments of the present disclosure belong.

[0073] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0074] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A hydraulic valve flow resistance detection system, characterized in that Comprising: A fixed displacement pump; A hydraulic valve, the liquid inlet end of which is connected to the liquid outlet end of the fixed displacement pump; A damping channel, the liquid inlet end of which is connected to the liquid outlet end of the fixed displacement pump; A relief valve, the liquid inlet end of which is connected to the liquid outlet end of the damping channel; A driving member, the power output end of which is connected to the relief pressure adjusting end of the relief valve; A control device, the signal output end of which is electrically connected to the signal input end of the driving member, and the control device is used to control the driving member to adjust the liquid pressure difference between the liquid inlet end and the liquid outlet end of the damping channel, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve at a rated flow rate. Wherein, the liquid pressure at the liquid outlet end of the damping channel is controlled by controlling the driving member to adjust the relief pressure of the relief valve; The hydraulic valve flow resistance detection system further comprises: A flow sensor, which is arranged on the pipeline connecting the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed displacement pump; Wherein, the signal input end of the control device is electrically connected to the signal output end of the flow sensor, and the control device controls the driving member according to the liquid flow rate between the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed displacement pump, so as to maintain the liquid flow rate at the liquid inlet end of the hydraulic valve at a rated flow rate; A first pressure sensor, which is arranged on the pipeline connecting the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed displacement pump; A second pressure sensor, which is arranged on the pipeline at the liquid outlet end of the hydraulic valve; Wherein, the signal input end of the control device is electrically connected to the signal output end of the first pressure sensor and the signal output end of the second pressure sensor respectively, and the control device obtains the flow resistance of the hydraulic valve according to the liquid pressure between the liquid inlet end of the hydraulic valve and the liquid outlet end of the fixed displacement pump and the liquid pressure at the liquid outlet end of the hydraulic valve.

2. The hydraulic valve flow resistance detection system according to claim 1, wherein The control device comprises: A data acquisition card, the signal input end of which is electrically connected to the signal output end of the flow sensor, the signal output end of the first pressure sensor and the signal output end of the second pressure sensor respectively; A computer, the signal input end of which is electrically connected to the signal output end of the data acquisition card, and the signal output end of which is electrically connected to the signal input end of the driving member.

3. The hydraulic valve flow resistance detection system according to claim 1, characterized in that The relief valve comprises: A valve body, in which a first chamber, a second chamber and a liquid passing channel are arranged. Liquid inlet ports and liquid outlet ports are arranged at one ends of the first chamber and the second chamber respectively. The liquid inlet port of the first chamber is connected to the liquid outlet end of the damping channel. The liquid inlet end of the liquid passing channel is connected to the liquid inlet port of the first chamber. The liquid outlet end of the liquid passing channel is connected to the other end of the first chamber and the liquid inlet port of the second chamber respectively; A first valve core, which is slidably arranged in the first chamber; A first spring, which is arranged between the first valve core and the chamber wall of the first chamber, and the first spring makes the first valve core cut off the passage between the liquid inlet port and the liquid outlet port of the first chamber; A second spool valve, which is slidably arranged in the second chamber; A second spring, which is arranged between the second spool valve and the power output end of the driving member. The second spring blocks the passage between the liquid inlet of the second chamber and the liquid outlet of the second chamber, and the driving member is used to adjust the compression amount of the second spring.

4. The hydraulic valve flow resistance detection system according to claim 3, wherein The overflow valve further includes: A guide sleeve, which is slidably arranged in the second chamber. One end of the guide sleeve is connected to the end of the second spring away from the second spool valve, and the other end of the guide sleeve is threadedly connected to the power output end of the driving member. The power output end of the driving member rotates to adjust the compression amount of the second spring.

5. The hydraulic valve flow resistance detection system according to claim 3, characterized in that, The overflow valve further includes: A solenoid valve, whose liquid inlet end is connected to the liquid outlet end of the liquid passage.

6. The hydraulic valve flow resistance detection system according to any one of claims 1-5, characterized in that, The hydraulic valve flow resistance detection system further includes: A safety valve, whose liquid inlet end is connected to the liquid outlet end of the metering pump.

7. The hydraulic valve flow resistance detection system according to any one of claims 1-5, characterized in that, The hydraulic valve flow resistance detection system further includes: A check valve, whose liquid inlet end is connected to the liquid outlet end of the metering pump, and the liquid outlet end of the check valve is respectively connected to the liquid inlet end of the hydraulic valve and the liquid inlet end of the damping passage.

8. The hydraulic valve flow resistance detection system according to any one of claims 1-5, characterized in that The hydraulic valve flow resistance detection system further includes: A liquid storage tank, whose liquid outlet end is connected to the liquid inlet end of the metering pump, and the liquid inlet end of the liquid storage tank is respectively connected to the liquid outlet end of the hydraulic valve and the liquid outlet end of the overflow valve.

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