A flow detection tool and its operation method

Abstract

The present invention relates to a flow detection fixture and its operating method. The fixture comprises a seat for supporting a denso valve plate. The seat has a top surface formed with a first oil hole and a second oil hole. The first oil hole is aligned with the oil inlet hole, and the second oil hole is aligned with the oil return hole. When the fixture is used to test the denso valve plate on a high-pressure flow test bench, the flow rates of the oil inlet and oil return holes can be measured under simulated operating conditions, simplifying the operating steps and reducing testing costs.

Description

Technical Field

[0001] The present invention relates to the field of electric valve plates, and in particular to a flow detection tool and an operating method thereof. Background Art

[0002] The Denso valve plate is a component within the fuel injector, featuring an oil inlet and oil return port. After machining, these ports require flow testing to assess their ability to provide fuel flow. Only after passing these tests can the plate be packaged. Currently, this testing is typically performed using a liquid high-pressure flow test bench, which should include at least one flow detection component and two oil lines for supplying calibration pump oil.

[0003] See Figure 1 and Figure 2 There is an existing electric valve plate, whose bottom surface is provided with an oil inlet hole 11, an oil return hole 12 and two positioning holes 14. The oil return hole 12 and the positioning holes 14 both pass through the electric valve plate 1 in the vertical direction, and a through hole 13 is provided on the side of the oil return hole 12, and the top of the oil inlet hole 11 is connected to the through hole 13.

[0004] When testing the oil return hole 12, close the oil inlet hole 11, and supply the calibration pump oil from the bottom end of the oil return hole 12 to the top end of the oil return hole 12 through an oil pipeline. Place the flow detection component close to the top end of the test oil return hole 12, and the calibration pump oil flowing out of the oil return hole 12 flows into the oil circuit of the flow detection component. The flow detection component can then measure the flow at the top end of the oil return hole 12.

[0005] When testing the oil inlet 11, it is necessary to close the oil circuit of the flow detection assembly, thereby closing the top of the oil return hole 12. Two oil pipelines are then used to supply calibration oil to the oil inlet 11 and the oil return hole 12, respectively. The calibration oil supplied to the oil return hole 12 is used to simulate the oil pressure during operation at the bottom of the oil return hole 12. The calibration oil flowing in the oil inlet 11 flows through the through hole 13 to the bottom of the oil return hole 12. At this time, the flow rate of the calibration oil in the oil pipeline connected to the oil inlet can be detected to obtain the flow rate at the bottom of the oil return hole 12.

[0006] When testing the oil inlet and return holes, due to the need to control complex connectivity relationships and strict simulated pressure conditions, different liquid high-pressure flow test benches are generally used to test the oil inlet and return holes. Different oil pipelines are used to transport calibration oil to the oil inlet or return holes for testing. The operation steps are complicated and the testing cost is high. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a flow detection tool and an operating method thereof to solve one or more problems in the prior art.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A flow detection tool comprises a seat body for supporting an electric valve plate, wherein a first oil hole and a second oil hole are formed on the top surface of the seat body, wherein the first oil hole is aligned with the oil inlet hole, and the second oil hole is aligned with the oil return hole.

[0010] Furthermore, the first oil hole includes a first groove opened on the side of the seat body, the open section of the first groove is provided with a sealing member, a first hole is provided between the first groove and the top surface of the seat body, a second hole is provided between the first groove and the bottom surface of the seat body, and the distance between the first hole and the second oil hole is smaller than the distance between the second hole and the second oil hole.

[0011] Furthermore, the blocking member is a pin, and the pin is interference fit with the first groove.

[0012] Furthermore, a diameter of a distal cross-section of the second oil hole is smaller than a diameter of a proximal cross-section of the second oil hole.

[0013] Furthermore, the second oil hole includes a first section hole and a second section hole connected in sequence, the distal end of the first section hole is connected to the proximal end of the second section hole, and the diameter of the second section hole is smaller than the diameter of the first section hole.

[0014] Furthermore, the second oil hole is a variable diameter hole, and the diameter of the second oil hole gradually decreases from the proximal end to the distal end.

[0015] Furthermore, the seat body is also provided with a positioning pin. When the electric valve plate is placed on the seat body, the positioning pin is engaged with the positioning hole of the electric valve plate to prevent the electric valve plate from deviating.

[0016] Furthermore, the seat body is provided with a second groove, and the positioning pin is embedded in the second groove and is interference fit with the second groove.

[0017] Furthermore, when the positioning pin is embedded in the positioning hole, the positioning pin does not protrude from the distal end surface of the electric valve plate.

[0018] A method for operating a flow detection tool, applicable to the above-mentioned flow detection tool, comprises the following steps:

[0019] Place the electric valve plate on the seat body, and connect the first oil hole and the second oil hole to the oil pipeline;

[0020] Supplying calibration oil to the second oil hole to simulate pressurized conditions; supplying calibration oil to the first oil hole to measure the flow rate at the far end of the oil return hole;

[0021] The first oil hole is closed, and calibration pump oil is supplied to the proximal end of the second oil hole, and the flow rate at the distal end of the oil return hole is measured.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] (1) Align the first oil hole with the oil inlet hole, and align the second oil hole with the oil return hole. When testing, close the oil inlet hole, and supply calibration pump oil to the near end of the oil return hole. Measure the flow at the far end of the oil return hole, and the flow of the oil return hole under working conditions can be measured; close the far end of the oil return hole, and supply calibration pump oil to the oil return hole. Simulate the pressurized condition at the near end of the oil return hole, supply calibration pump oil to the oil inlet hole, and measure the flow at the near end of the oil return hole at this time. The flow from the oil inlet hole to the near end of the oil return hole under working conditions can be measured. Using the tooling in this solution, the flow of the oil inlet and oil return holes can be tested directly on a liquid high-pressure flow test bench, which simplifies the operating steps and reduces the testing cost.

[0024] (2) Connect the first and second holes to the first groove, and make the distance between the first and second oil holes smaller than the distance between the second and second oil holes. The distance between the first and second oil holes needs to correspond to the distance between the oil inlet and oil return holes. The distance between the second and second oil holes is larger than the distance between the first and second oil holes to adapt to the distance between the two oil pipelines of the liquid high-pressure flow test bench.

[0025] (3) Setting the distal cross-sectional diameter of the second oil hole to be smaller than the proximal cross-sectional diameter of the second oil hole can increase the average wall thickness between the first oil hole and the second oil hole, thereby avoiding puncturing the side wall between the first oil hole and the second oil hole when machining the first oil hole and the second oil hole.

[0026] (4) A positioning pin is provided on the seat body, and the positioning pin can be used to locate the position of the electric valve plate, so that during detection, the first oil hole is aligned with the oil inlet hole, and the second oil hole is aligned with the oil return hole.

[0027] (5) If the positioning pin does not protrude from the distal end of the electric valve plate, the flow detection assembly can fit the distal end of the electric valve plate, thereby ensuring the accuracy of the flow test at the distal end of the oil return hole and the sealing performance when the distal end of the oil return hole is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a valve plate in the background art is shown;

[0029] Figure 2 Shown Figure 1 Top view of the CEC valve plate;

[0030] Figure 3 A cross-sectional view of a flow detection tool in a first embodiment of the present invention is shown;

[0031] Figure 4 A top view of the flow detection tooling in the first embodiment of the present invention is shown;

[0032] Figure 5 A cross-sectional view of the flow detection tooling in the second embodiment of the present invention is shown.

[0033] In the accompanying drawings:

[0034] 1. Denso valve plate; 11. Oil inlet hole; 12. Oil return hole; 13. Through hole; 14. Positioning hole; 2. Seat; 21. Second oil hole; 211. First section hole; 212. Second section hole; 22. First oil hole; 221. First groove; 222. First hole; 223. Second hole; 224. Sealing piece; 23. Second groove; 231. Positioning pin. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the flow detection tooling and its operation method proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0036] In order to more clearly describe the above-mentioned flow detection tooling and its operation method, the present invention defines the terms "proximal end" and "distal end". Specifically, "proximal end" refers to the end of the electric valve plate and seat body close to the oil pipeline of the liquid high-pressure flow test bench; "distal end" refers to the end of the electric valve plate and seat body away from the oil pipeline of the liquid high-pressure flow test bench. Figure 3 For example, Figure 3 The lower side is the proximal end, Figure 3 The upper side is the distal end.

[0037] Example 1

[0038] Please refer to Figure 3The present application provides a flow detection tool, which includes a base body 2 for supporting an electric valve plate 1. The top surface of the base body 2 is provided with a first oil hole 22 and a second oil hole 21. When the electric valve plate 1 is placed on the top surface of the base body 2, the top of the first oil hole 22 is aligned with the oil inlet hole 11, and the top of the second oil hole 21 is aligned with the oil return hole 12. During testing, the base body 2 is placed on the operating table of a liquid high-pressure flow test bench, and the bottom ends of the first oil hole 22 and the second oil hole 21 are respectively aligned with an oil pipeline of the liquid high-pressure flow test bench.

[0039] When testing, the working conditions are simulated by controlling the on-off of the oil pipeline, and the flow rates of the oil inlet hole 11 and the oil return hole 12 are tested.

[0040] When testing the oil return hole 12, close the oil pipeline connected to the first oil hole 22, and supply calibration pump oil to the second oil hole 21. Fit the flow detection component to the far end surface of the electric valve plate 1. The flow detection component can be used to measure the flow at the far end of the oil return hole 12, and the flow of the oil return hole 12 under working conditions can be measured.

[0041] When testing the oil inlet 11, the flow detection component is fitted with the distal surface of the electric valve plate 1, and the oil circuit of the flow detection component is closed, so as to achieve the purpose of closing the distal end of the oil return hole 12. It should be noted that a seal can also be directly pressed on the distal surface of the electric valve plate 1 to close the distal end of the oil return hole 12. At this time, the calibration pump oil is supplied to the second oil hole 21, and the pressurized condition can be simulated at the proximal end of the oil return hole 12, while the calibration pump oil is supplied to the first oil hole 22. At this time, the flow of the oil pipeline connected to the oil return hole 12 is measured, and the flow from the oil inlet 11 to the distal end of the oil return hole 12 under working conditions can be measured. Using the tooling in this solution, the oil inlet 11 and the oil return hole 12 can be tested directly on a liquid high-pressure flow test bench, which simplifies the operating steps and reduces the testing cost.

[0042] Specifically, when the return oil hole 12 is tested, the oil pressure of the calibration pump oil supplied to the second oil hole 21 is 100 Bar; when the oil inlet hole 11 is tested, the oil pressure of the calibration pump oil supplied to the return oil hole 12 for simulating the pressurized condition is 60 Bar, and the oil pressure of the calibration pump oil supplied to the oil inlet hole 11 is 100 Bar.

[0043] Please refer to Figure 3Specifically, the first oil hole 22 includes a first groove 221 defined in the side of the base body 2. A sealing member 224 is provided at the open end of the first groove 221. The sealing member 224 is a pin that forms an interference fit with the first groove 221, thereby sealing the open end of the first groove 221. A first hole 222 is provided between the first groove 221 and the top surface of the base body 2, and a second hole 223 is provided between the first groove 221 and the bottom surface of the base body 2. The distance between the first hole 222 and the second oil hole 21 is smaller than the distance between the second hole 223 and the second oil hole 21. The distance between the first hole 222 and the second oil hole 21 should correspond to the distance between the oil inlet hole 11 and the oil return hole 12. The distance between the second hole 223 and the second oil hole 21 needs to adapt to the distance between the two oil pipelines of the liquid high-pressure flow test bench. The distance between the second hole 223 and the second oil hole 21 is configured to be greater than the distance between the first hole 222 and the second oil hole 21. In this way, the two oil pipelines of the liquid high-pressure flow test bench do not need to be set too close to each other, which reduces the requirements for the liquid high-pressure flow test bench and thus reduces the procurement or configuration cost of the liquid high-pressure flow test bench.

[0044] Please refer to Figure 3 Furthermore, to prevent the sidewall between the first oil hole 22 and the second oil hole 21 from being punctured during machining, the wall thickness between the first oil hole 22 and the second oil hole 21 needs to be increased. Therefore, the distal cross-sectional diameter of the second oil hole 21 is set smaller than the proximal cross-sectional diameter of the second oil hole 21. Setting the distal cross-sectional diameter of the second oil hole 21 smaller than the proximal cross-sectional diameter of the second oil hole 21 increases the wall thickness between the first oil hole 22 and the second oil hole 21, preventing the sidewall between the first oil hole 22 and the second oil hole 21 from being punctured during machining.

[0045] Please refer to Figure 3 Specifically, the second oil hole 21 includes a first section hole 211 and a second section hole 212 which are connected in sequence, the distal end of the first section hole 211 is connected to the proximal end of the second section hole 212, and the diameter of the second section hole 212 is smaller than the diameter of the first section hole 211.

[0046] Please refer to Figure 3 and Figure 4Furthermore, two second grooves 23 are provided on the distal surface of the seat body 2, and positioning pins 231 are embedded in the two second grooves 23. The distal ends of the positioning pins 231 protrude from the distal surface of the seat body 2, and the positioning pins 231 are interference fit with the second grooves 23, that is, the positioning pins 231 are detachably connected to the seat body 2. When the seat body 2 is worn after multiple tests, it will cause the calibration pump oil to leak from between the seat body 2 and the electric valve plate 1 during use, so the seat body 2 needs to be replaced, while the positioning pins 231 can be reused, reducing the cost of use. When the electric valve plate 1 is placed on the seat body 2, the two positioning pins 231 are respectively embedded in the two positioning holes 14 (not shown in the figure) of the electric valve plate 1, thereby preventing the electric valve plate 1 from deviating during detection, so that the first oil hole 22 is aligned with the oil inlet hole 11, and the second oil hole 21 is aligned with the oil return hole 12.

[0047] Specifically, when the positioning pin 231 is embedded in the positioning hole 14, the positioning pin 231 does not protrude from the distal end surface of the electric valve plate 1. When the flow rate of the electric valve plate 1 is detected, the flow detection component can fit with the distal end surface of the electric valve plate 1 to ensure the accuracy of the flow test at the distal end of the oil return hole 12.

[0048] The present application also provides an operating method of a flow detection tool, which is applicable to the above-mentioned flow detection tool, comprising the steps of:

[0049] S1. Place the electric valve plate 1 on the seat 2, and connect the first oil hole 22 and the second oil hole 21 to the oil pipeline;

[0050] S2 only closed the distal end of the oil return hole 12, the oil return hole 12 near the supply school pump oil to simulate the working pressure conditions, the oil inlet hole 11 supply school pump oil, measuring the flow rate of the oil return hole 12 near the end;

[0051] S3. Only the oil inlet hole 11 is closed, and calibration oil is supplied to the proximal end of the oil return hole 12, and the flow rate at the distal end of the oil return hole 12 is measured.

[0052] Working principle:

[0053] Place the seat 2 on a high-pressure flow test bench, aligning the first and second oil holes 22 and 21 with the test bench's oil pipelines. Then, install the electric valve plate 1 on the seat 2. By adjusting the conditions for supplying calibration oil to the two oil pipelines of the high-pressure flow test bench, the flow rates of the oil inlet hole 11 and the oil return hole 12 can be tested under simulated working conditions. Using the fixture in this solution, the oil inlet hole 11 and the oil return hole 12 can be tested directly on a liquid high-pressure flow test bench, simplifying the process and reducing testing costs.

[0054] Example 2:

[0055] Reference Figure 5The difference between this embodiment and the first embodiment is that the second oil hole 21 is a variable diameter hole, and the diameter of the second oil hole 21 gradually decreases from the proximal end to the distal end.

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A flow detection tool, characterized by: The invention comprises a seat body for supporting a denso valve plate, wherein a first oil hole and a second oil hole are formed on a top surface of the seat body, wherein the first oil hole is aligned with the oil inlet hole, and the second oil hole is aligned with the oil return hole; the first oil hole comprises a first groove formed on a side surface of the seat body, wherein an open section of the first groove is provided with a blocking member; a first hole is provided between the first groove and the top surface of the seat body for communication, and a second hole is provided between the first groove and the bottom surface of the seat body for communication, wherein a distance between the first hole and the second oil hole is smaller than a distance between the second hole and the second oil hole; the denso valve plate is placed on the seat body, and the first oil hole and the second oil hole are connected to the oil pipeline; Only the distal end of the oil return hole is closed, and calibration oil is supplied to the proximal end of the oil return hole to simulate the pressure conditions during operation, and calibration oil is supplied to the oil inlet hole to measure the flow rate at the proximal end of the oil return hole; Only the oil inlet hole is closed, and calibration pump oil is supplied to the proximal end of the oil return hole, and the flow rate at the distal end of the oil return hole is measured.

2. A flow detection tool as claimed in claim 1, characterized in that: The blocking member is a pin, and the pin is interference-fitted with the first groove.

3. A flow detection tool as claimed in claim 1, characterized in that: A distal cross-sectional diameter of the second oil hole is smaller than a proximal cross-sectional diameter of the second oil hole.

4. A flow detection tool as claimed in claim 3, characterized in that: The second oil hole includes a first section hole and a second section hole connected in sequence, the distal end of the first section hole is connected to the proximal end of the second section hole, and the diameter of the second section hole is smaller than that of the first section hole.

5. A flow detection tool as claimed in claim 3, characterized in that: The second oil hole is a variable diameter hole, and the diameter of the second oil hole gradually decreases from the proximal end to the distal end.

6. A flow detection tool according to any one of claims 1 to 5, characterized in that: The seat body is further provided with a positioning pin. When the electric valve plate is placed on the seat body, the positioning pin is engaged with the positioning hole of the electric valve plate to prevent the electric valve plate from deflecting.

7. A flow detection tool as claimed in claim 6, characterized in that: The seat body is provided with a second groove, and the positioning pin is embedded in the second groove and is interference-fitted with the second groove.

8. A flow detection tool as claimed in claim 6, characterized in that: When the positioning pin is embedded in the positioning hole, the positioning pin does not protrude from the distal end surface of the electric valve plate.

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