Hydraulic test flowmeter protection loop

By designing the hydraulic test flowmeter protection circuit in hydraulic test, using components such as the overflow valve and two-way cartridge valve, the damage to the flowmeter by pressure shock in the oil test is solved, and the anti-impact protection of the flowmeter is achieved. Measurement accuracy.

CN119146121APending Publication Date: 2024-12-17CHINA COAL TECH & ENG GRP SHANGHAI
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Patent Information

Application Number
CN202411512359.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-28
Publication Date
2024-12-17

AI Technical Summary

Technical Problem

In oil tests, pressure shocks can easily damage the flowmeter, and the prior art is difficult to effectively avoid this problem.

Method used

A hydraulic test flowmeter protection circuit is designed. By setting up an overflow valve at the main flowmeter inlet as a safety valve, and an auxiliary flowmeter is set up at the outlet of the overflow valve. Using a combination of two-way cartridge valve and reversing valve, the control chamber is added. The accumulator and damping hole slow down the valve opening and closing speed, avoid pressure shock, and measure the flow rate separately through two flow meters to reduce errors.

Benefits of technology

It effectively avoids damage to the flowmeter by pressure shock, ensures the accuracy and safety of flow measurement, and reduces measurement errors.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a hydraulic test flowmeter protection loop which comprises a first two-way cartridge valve, a second two-way cartridge valve and a first flowmeter. When the first two-way cartridge valve is closed due to pressure buildup of a control cavity and the second two-way cartridge valve is opened due to pressure relief of a control port, test flow flows out through the second two-way cartridge valve and the first flow meter; an overflow valve is additionally arranged at an inlet of the first flow meter to serve as a safety valve, a second flow meter is arranged at an outlet of the overflow valve, when the pressure is high, the overflow valve is opened, one part of flow is measured through the first flow meter, the other part of flow is measured through the overflow valve through the second flow meter and added with a measured value of the first flow meter, and the total flow value is measured. According to the scheme, the overflow valve is arranged at the inlet of the main flow meter, the flow meter is arranged at the outlet of the overflow valve, the overflow valve is opened when pressure impact is detected, part of flow passes through the safety valve and then is measured through the auxiliary flow meter, and the main flow meter is prevented from being damaged by flow impact.
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Description

Technical Field

[0001] The invention relates to the technical field of hydraulic devices, and in particular to a protection circuit for a hydraulic test flowmeter. Background Art

[0002] During oil testing, pressure shock can easily damage the flow meter. To protect the flow meter, many test benches use Figure 1 The circuit shown includes a reversing valve, a flow meter and a check valve.

[0003] When the reversing valve 1 loses power, the flow does not pass through the flow meter 2; when the flow meter needs to be used, the reversing valve 1 is energized and the flow passes through the flow meter 2 and the one-way valve 3.

[0004] When the reversing valve is opened and the flow meter 2 is connected, a pressure shock may occur, which may damage the flow meter, especially when measuring high-pressure flow.

[0005] During the use of the flow meter, pressure shock may occur due to various reasons.

[0006] Therefore, it can be seen that how to avoid damage to the flow meter due to impact force during oil testing is a technical problem that needs to be solved in this field. Summary of the invention

[0007] In view of the technical problem that the flow meter is damaged by pressure shock in the existing hydraulic test, the purpose of the present invention is to provide a hydraulic test flow meter protection circuit, which can prevent the flow meter from being damaged by pressure shock when detecting the flow, thereby effectively overcoming the problems existing in the prior art.

[0008] In order to achieve the above-mentioned object, the present invention provides a hydraulic test flowmeter protection circuit, comprising a first two-way cartridge valve, a second two-way cartridge valve, and a first flowmeter, wherein when the first two-way cartridge valve is closed due to pressure buildup in the control chamber, and the second two-way cartridge valve is opened due to pressure relief at the control port, the test flow flows out of the first flowmeter through the second two-way cartridge valve;

[0009] An overflow valve is additionally provided at the inlet of the first flowmeter, and a second flowmeter is provided at the outlet of the overflow valve. When the overflow valve pressure is high, the overflow valve opens, a part of the flow is measured by the first flowmeter, and the other part of the flow is measured by the second flowmeter through the overflow valve, and the value is added to the measurement value of the first flowmeter to measure the total flow value.

[0010] Furthermore, a reversing valve is provided at the control port of the first two-way cartridge valve, the oil inlet in the reversing valve is connected to an external control oil source, and the oil return port in the reversing valve is connected to a first oil tank, and the pressure building and pressure relief of the control chambers of the first two-way cartridge valve and the second two-way cartridge valve are controlled by the action of the reversing valve.

[0011] Furthermore, a first accumulator is provided in cooperation with the control chamber of the first two-way cartridge valve.

[0012] Furthermore, a first damping hole is provided in the control chamber of the first two-way cartridge valve.

[0013] Furthermore, a second accumulator is provided in cooperation with the control chamber of the second two-way cartridge valve.

[0014] Furthermore, a second damping hole is provided in the control chamber of the first two-way cartridge valve.

[0015] Furthermore, a one-way valve is provided at the outlet of the first flow meter.

[0016] The hydraulic test flowmeter protection circuit provided by the present invention has an overflow valve at the inlet of the main flowmeter used as a safety valve, and the overflow valve can prevent the pressure from being too high.

[0017] Secondly, a flow meter is set at the outlet of the overflow valve. Once the overflow valve is opened, the flow passing through the overflow valve is measured by the auxiliary flow meter. In addition, the internal leakage flow of the overflow valve is also measured by the auxiliary flow meter. Therefore, the test flow can be detected separately by two flow meters to avoid flow measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic diagram of the circuit structure of the existing hydraulic test flowmeter;

[0020] Figure 2 This is a schematic diagram of the protection circuit structure of the hydraulic test flowmeter.

[0021] The following is a description of the components in the accompanying drawings:

[0022] 11. First two-way cartridge valve 12. First accumulator 13. Reversing valve 21. Second two-way cartridge valve 22. Second accumulator 31. First flow meter 32. Overflow valve 33. Second flow meter 34. Check valve 4. First oil tank 5. Second oil tank. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0024] The hydraulic test flowmeter protection circuit provided by the present invention is shown in FIG. Figure 2, which includes a first two-way cartridge valve 11, a first accumulator 12, a reversing valve 13, a second two-way cartridge valve 21, a second accumulator 22, a first flowmeter 31, a relief valve 32, a second flowmeter 33, a first oil tank 4 and a second oil tank 5.

[0025] The first two-way cartridge valve 11 , the first accumulator 13 and the reversing valve 13 cooperate to form a first oil circuit.

[0026] The reversing valve 13 comprises an oil inlet, a first oil outlet, a second oil outlet and an oil return port.

[0027] The oil inlet is connected to a pipeline provided in conjunction with an external control oil source and is used for inputting the external control oil source.

[0028] The first oil outlet is connected to the control chamber of the first two-way cartridge valve 11 and the first accumulator 12 respectively.

[0029] When the reversing valve 13 is in the initial position, the oil return port is connected to the first oil outlet, and the control chamber of the first two-way cartridge valve 11 and the first accumulator 21 return oil to the first oil tank 4 through the damping hole and the oil return port of the reversing valve 13, and the pressure is unloaded.

[0030] When the reversing valve 13 is actuated, the oil inlet is connected to the first oil outlet, and the external control oil source fills the control chamber of the first two-way cartridge valve 11 and the first accumulator 12 through the first oil outlet of the reversing valve 13 to build up pressure.

[0031] A first damping hole is provided between the control chamber of the first two-way cartridge valve 11 and the reversing valve 13. In this scheme, the first accumulator 12 is used to increase the volume of the control chamber of the first two-way cartridge valve 11, and combined with damping, the time for pressure building and unloading of the control chamber is prolonged, thereby slowing down the opening and closing speed of the first two-way cartridge valve 11 to avoid pressure shock.

[0032] The first two-way cartridge valve 11 includes a first channel, a second channel and a first control port. The first control port is connected to the reversing valve 13. The first channel is connected to a pipeline provided with an external test flow for inputting the test flow, and the second channel is used for outflowing the test flow.

[0033] The second two-way cartridge valve 21 cooperates with the second accumulator 23 to form a second oil circuit.

[0034] The second oil outlet of the reversing valve 13 is connected to the control chamber of the second two-way cartridge valve 21 and the second accumulator 22 .

[0035] When the reversing valve 13 is in the initial position, the oil inlet is connected to the second oil outlet, and the external control oil source fills the control chamber of the second two-way cartridge valve 21 and the second accumulator 22 through the second oil outlet of the reversing valve 13, and pressure is built up in the control chamber.

[0036] When the reversing valve 13 is actuated, the oil return port is connected to the second oil outlet, and the second two-way cartridge valve 21 controls the chamber and the first accumulator 22 to return oil to the first oil tank 4 through the damping hole and the oil return port of the reversing valve 13, thereby unloading the pressure in the control chamber.

[0037] At the same time, a second damping hole is provided between the second two-way cartridge valve 21 and the reversing valve 13. The present scheme utilizes the second accumulator 22 to increase the volume of the control chamber of the second two-way cartridge valve 21, and combines the damping to extend the time for pressure building and unloading of the control chamber, thereby slowing down the speed of opening and closing of the second two-way cartridge valve 21 and avoiding pressure shock.

[0038] The second two-way cartridge valve 21 includes a third channel, a fourth channel and a second control port. The second control port is connected to the reversing valve 13. The third channel is connected to a pipeline arranged to match the external test flow for inputting the test flow. The fourth channel is connected to the first flow meter 31. The flow value of the test flow outflowing from the fourth channel is detected by the first flow meter 31.

[0039] This solution preferably uses a two-way cartridge valve in the hydraulic circuit. The two-way cartridge valve has small pressure loss and small leakage, and is suitable for use as a directional control valve in a hydraulic test circuit.

[0040] Secondly, the control chamber volume of the two-way cartridge valve is very small, and the pressure building and pressure relief speeds are fast. By increasing the volume of the control chamber of the two-way cartridge valve through an external accumulator, and then cooperating with the damping hole, the speed of pressure building and pressure relief in the control chamber is slowed down, thereby slowing down the closing and opening speed of the main valve core of the two-way cartridge valve, avoiding pressure shocks caused by sudden flow on and off; and this method is modified on the basis of the conventional two-way cartridge valve, and is easy to implement.

[0041] In addition, in this solution, one reversing valve is used to control two two-way cartridge valves to avoid the situation where two reversing valves are used to control the two two-way cartridge valves respectively. Once the control system or the reversing valve fails, both two-way cartridge valves may be closed, causing serious consequences.

[0042] Furthermore, a one-way valve 34 is provided at the outlet of the first flow meter 31 to prevent the fluid from flowing in reverse and causing damage to the flow meter or measurement errors.

[0043] Furthermore, the present solution also adds an overflow valve 32 at the inlet of the first flowmeter 31. Here, the overflow valve is used as a safety valve to prevent the flowmeter inlet pressure from being too high. That is, on the basis of controlling the opening and closing speed of the two-way cartridge valve, a protection measure is added. If a pressure shock occurs at the inlet of the first flowmeter 31, the overflow valve 32 is used to prevent the shock pressure from being too high.

[0044] A second flow meter 33 is set at the outlet of the overflow valve 32. Once the overflow valve 32 is opened, there is flow through the overflow valve 32 to the second oil tank 5. This part of the flow can be measured by the second flow meter 33. At the same time, the flow generated by the leakage inside the overflow valve is also measured by the second flow meter 33, and added to the measurement value of the first flow meter 31, which can reduce the measurement error.

[0045] The hydraulic test flowmeter protection circuit formed based on the above scheme can protect the flowmeter from impact during the oil test. The following example illustrates the working process of the specific oil test. The specific working process is as follows:

[0046] When not using a flow meter:

[0047] The reversing valve 13 does not move, the oil in the control chamber of the first two-way cartridge valve 11 and the first accumulator 12 returns through the damping hole and the reversing valve 13, and the first two-way cartridge valve 11 is opened; the external control oil source fills the control chamber of the second two-way cartridge valve 21 and the second accumulator 22 through the reversing valve 13 to build up pressure, and the second two-way cartridge valve 21 is closed.

[0048] The test flow flows out through the first two-way cartridge valve 11;

[0049] Using a flow meter:

[0050] The reversing valve 13 is actuated, and the oil in the control chamber of the second two-way cartridge valve 21 and the second accumulator 22 returns through the damping hole and the reversing valve 13, gradually unloading, and the second two-way cartridge valve 21 is gradually opened; the external control oil source is filled into the control chamber of the first two-way cartridge valve 11 and the first accumulator 12 through the reversing valve 13, gradually building up pressure, and the first two-way cartridge valve 11 is gradually closed.

[0051] When the first two-way cartridge valve 11 is closed and the second two-way cartridge valve 21 is opened, the test flow passes through the first two-way cartridge valve 11 and the second two-way cartridge valve 21 at the same time. After the first two-way cartridge valve 11 is completely closed, the test flow flows out through the second two-way cartridge valve 21, the first flowmeter 31, and the one-way valve 35;

[0052] If a pressure shock occurs at the inlet of the first flow meter 31, the overflow valve 32 sets the pressure, the overflow valve 32 opens, and the oil flow passes through the second flow meter 33. At this time, the test flow is the sum of the flow measured by the first flow meter 31 and the second flow meter 32;

[0053] Flow measurement ends:

[0054] The reversing valve 13 is reset, and the oil in the control chamber of the first two-way cartridge valve 21 and the first accumulator 22 returns through the damping hole and the reversing valve 13, gradually unloading, and the first two-way cartridge valve 11 gradually opens; the external control oil source fills the control chamber of the second two-way cartridge valve 21 and the second accumulator 22 through the reversing valve 13, gradually building up pressure, and the second two-way cartridge valve 21 gradually closes.

[0055] When the first two-way cartridge valve 11 is opened and the second two-way cartridge valve 21 is closed, the test flow simultaneously passes through the first two-way cartridge valve 11 and the second two-way cartridge valve 21. After the first two-way cartridge valve 11 is fully opened and the second two-way cartridge valve 21 is fully closed, the test flow flows out through the first two-way cartridge valve 11.

[0056] The protection circuit of the hydraulic test flowmeter formed by the above scheme provides an overflow valve at the inlet of the main flowmeter for use as a safety valve, which can avoid excessive impact pressure when the overflow valve is opened.

[0057] Secondly, a flow meter is installed at the outlet of the relief valve. Once the relief valve is opened due to high pressure detection, part of the flow will be measured by the auxiliary flow meter after passing through the safety valve to reduce the flow measurement error.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic test flowmeter protection circuit, characterized in that: It includes a first two-way cartridge valve, a second two-way cartridge valve, and a first flow meter. When the first two-way cartridge valve is closed due to pressure buildup in the control chamber, and the second two-way cartridge valve is opened due to pressure relief at the control port, the test flow flows out through the second two-way cartridge valve and the first flow meter; An overflow valve is additionally provided at the inlet of the first flowmeter, and a second flowmeter is provided at the outlet of the overflow valve. When the pressure is high, the overflow valve opens, a part of the flow is measured by the first flowmeter, and the other part of the flow is measured by the second flowmeter through the overflow valve, and the value is added to the measurement value of the first flowmeter to measure the total flow value.

2. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: A reversing valve is provided at the control port of the first two-way cartridge valve, the oil inlet in the reversing valve is externally connected to an external control oil source, and the oil return port in the reversing valve is externally connected to a first oil tank, and the pressure building and pressure relief of the control chambers of the first two-way cartridge valve and the second two-way cartridge valve are controlled by the action of the reversing valve.

3. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: A first accumulator is provided in cooperation with the control chamber of the first two-way cartridge valve.

4. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: A first damping hole is provided in the control chamber of the first two-way cartridge valve.

5. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: A second accumulator is provided in cooperation with the control chamber of the second two-way cartridge valve.

6. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: A second damping hole is provided in the control chamber of the first two-way cartridge valve.

7. A hydraulic test flowmeter protection circuit according to claim 1, characterized in that: The first flow meter outlet is provided with a one-way valve.