Supercharged metering device

Abstract

A supercharged metering device comprises an air source, a pressure reducing valve, a reversing valve, a supercharging mechanism, a transparent oil drum and a tested piece which are communicated through pipelines, the pressure reducing valve and the reversing valve are sequentially arranged between the air source and the supercharging mechanism, the two ends of the pressure reducing valve are connected with the air source and the reversing valve respectively, and one end of the reversing valve is connected with the supercharging mechanism and drives the supercharging mechanism to move. And a first control valve and a second control valve are respectively arranged between the pressurizing mechanism and the transparent oil drum as well as the tested piece. Specifically, in the design, a pressure reducing valve is an electric proportional pressure reducing valve, a first control valve and a second control valve are electric control ball valves, power is provided through an air source, and after pressure reduction is conducted through the pressure reducing valve, the power direction is controlled through a reversing valve, so that a pressurizing mechanism is driven to conduct pressurizing operation; and the grating ruler reciprocates in the measuring plunger shell and is used for measuring the displacement of the measuring plunger, so that the accurate metering of the flow is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a pressurized metering device. Background Art

[0002] Traditional flow measurement in the hydraulic field is mainly based on various flow sensors, which generally require a hydraulic station involving the power system to complete. The flowmeter connected to the hydraulic station has problems such as high cost, insufficient accuracy, limited range, and easy damage. In addition, the completion of the hydraulic station requires a lot of manpower, time and cost investment, which cannot meet the verification needs of many products in a timely manner. Utility Model Content

[0003] In view of this, the utility model provides a pressurized metering device.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A pressurized metering device comprises an air source, a pressure reducing valve, a reversing valve, a pressurizing mechanism, a transparent oil barrel and a test piece connected by a pipeline, wherein the pressure reducing valve and the reversing valve are sequentially arranged between the air source and the pressurizing mechanism, the two ends of the pressure reducing valve are respectively connected to the air source and the reversing valve, one end of the reversing valve is connected to the pressurizing mechanism and drives the pressurizing mechanism to move, and a first control valve and a second control valve are respectively arranged between the pressurizing mechanism and the transparent oil barrel and the test piece.

[0006] Preferably, the boosting mechanism includes a cylinder, a measuring plunger, a measuring plunger housing and a grating ruler, one end of the measuring plunger extends into the measuring plunger housing and slides with the measuring plunger housing, the other end of the measuring plunger is connected to the cylinder, the grating ruler is fixed on one end of the measuring plunger close to the cylinder, a fixed structure is provided between the grating ruler and the measuring plunger, and the grating ruler is connected to the measuring plunger via the fixed structure.

[0007] Preferably, a shell cavity is formed in the measuring plunger shell, and the shell cavity has an inner cavity body portion and a cavity matching portion. A sealing structure is arranged between the shell cavity and the measuring plunger, and the sealing structure includes an oil seal and a sealing ring. The measuring plunger has a measuring end face, and the height of the cavity matching portion is higher than the height of the measuring end face.

[0008] Preferably, the fixing structure includes a connecting sleeve and a fixing screw, the cylinder includes a cylinder body and a cylinder push rod, a cylinder inner cavity is formed in the cylinder body, one end of the cylinder push rod extends into the cylinder inner cavity and is slidably connected to the cylinder body, the cylinder push rod has a piston extension end, and the piston extension end is arranged on the part of the cylinder push rod extending out of the cylinder inner cavity, a connecting groove is provided on the connecting sleeve, the connecting sleeve is arranged on the piston extension end through the connecting groove and is threadedly connected to the piston extension end, the bottom end of the measuring plunger extends into the connecting groove and is connected to the connecting sleeve, one end of the fixing screw passes through the grating scale, the connecting sleeve and one end of the measuring plunger in turn and extends into the connecting groove to threadably connect the grating scale, the connecting sleeve and the measuring plunger.

[0009] Preferably, a cover plate is provided on the end of the measuring plunger housing away from the cylinder, and the cover plate is mounted on the measuring plunger housing by screws. A locking structure is provided between the cover plate and the cylinder, and the locking structure includes a locking nut and a stud screw, one end of the stud screw is threadedly connected to the top end of the cylinder, the other end of the stud screw abuts against the cover plate, and one end of the locking nut passes through the cover plate and is threadedly connected to the stud screw.

[0010] Preferably, another boosting mechanism with the same structure is arranged in series on one side of the boosting mechanism, and the boosting mechanisms are connected in series through a pipeline, and a manual ball valve is arranged on the pipeline.

[0011] Preferably, a muffler is provided on one side of the reversing valve, and the muffler is connected to the reversing valve through a pipeline.

[0012] The beneficial effect of the utility model is that the boosting metering device of the utility model is powered by an air source, and after the pressure is reduced by a pressure reducing valve, the power direction is controlled by a reversing valve, thereby driving a boosting mechanism to perform a boosting operation. The boosting mechanism includes a cylinder, a measuring plunger, a measuring plunger housing, and a grating ruler. The measuring plunger reciprocates in the measuring plunger housing under the push of the cylinder, and the grating ruler is used to measure the displacement of the plunger, thereby realizing accurate measurement of the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 Schematic diagram of metering device;

[0015] Figure 2 Schematic diagram of the boost mechanism;

[0016] Figure 3 Cover plate connection diagram;

[0017] Figure 4 It is a schematic diagram of the sealing structure;

[0018] Figure 5 It is a schematic diagram of a fixed structure;

[0019] Figure 6 It is a schematic diagram of the series structure of the boosting mechanism. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0022] The utility model provides the following technical solutions:

[0023] As attached Figure 1-6 As shown, the utility model discloses a boosting metering device, including an air source 1, a pressure reducing valve 2, a reversing valve 3, a boosting mechanism 4, a transparent oil drum 5 and a test piece 6 connected by a pipeline, wherein the pressure reducing valve 2 and the reversing valve 3 are sequentially arranged between the air source 1 and the boosting mechanism 4, the two ends of the pressure reducing valve 2 are respectively connected to the air source 1 and the reversing valve 3, one end of the reversing valve 3 is connected to the boosting mechanism 4 and drives the boosting mechanism 4 to move, and the first control valve 7 and the second control valve 8 are respectively arranged between the boosting mechanism 4 and the transparent oil drum 5 and the test piece 6. Specifically, in this design, the pressure reducing valve 2 is an electric proportional pressure reducing valve 2, and the first control valve 7 and the second control valve 8 are both electrically controlled ball valves, which are powered by the air source, and after the pressure is reduced by the pressure reducing valve, the power direction is controlled by the reversing valve, thereby driving the boosting mechanism to perform a boosting operation. The booster mechanism includes a cylinder, a measuring plunger, a measuring plunger housing and a grating ruler. The measuring plunger reciprocates in the measuring plunger housing under the push of the cylinder, and the grating ruler is used to measure the displacement of the plunger, thereby achieving accurate measurement of the flow rate.

[0024] Further, the boost mechanism 4 includes a cylinder 9, a measuring plunger 10, a measuring plunger housing 11 and a grating ruler 12, one end of the measuring plunger 10 extends into the measuring plunger housing 11 and slides with the measuring plunger housing 11, the other end of the measuring plunger 10 is connected to the cylinder 9, the grating ruler 12 is fixed on the end of the measuring plunger 10 close to the cylinder 9, a fixed structure 13 is arranged between the grating ruler 12 and the measuring plunger 10, and the grating ruler 12 is connected to the measuring plunger 10 through the fixed structure 13. Specifically, in the present embodiment, a measuring space is arranged inside the measuring plunger housing 11, and the measuring plunger 10 reciprocates in the measuring space to simulate the boost process of the test piece 6. When the test piece 6 is subjected to pressure, the measuring plunger 10 will move toward the cylinder 9, and the grating ruler 12 will record the displacement of the measuring plunger 10, thereby obtaining the pressure value of the test piece 6. In order to facilitate observation and adjustment, a transparent oil barrel 5 is used to facilitate observation of the oil level. At the same time, for the convenience of control, the electric proportional pressure reducing valve 2, the electric control ball valve and the cylinder 9 are all connected to the gas source, which can adjust the output pressure of the pressure reducing valve 2, control the switching state of the first control valve 7 and the second control valve 8, and control the telescopic movement of the cylinder 9 as needed, so as to achieve precise control of the pressurization process of the test piece 6. In addition, in order to ensure the accuracy and reliability of the measurement, the grating ruler 12 uses a high-precision measuring element, which can accurately record the displacement of the measuring plunger 10, and transmit the displacement back to the host computer for data processing and analysis to obtain the pressure value of the test piece 6.

[0025] Furthermore, a shell inner cavity 14 is formed in the measuring plunger housing 11, and the shell inner cavity 14 has an inner cavity body portion 15 and a cavity matching portion 16. A sealing structure is arranged between the measuring plunger 10, and the sealing structure includes an oil seal 31 and a sealing ring 32. The oil seal 31 is arranged on a side of the sealing ring 32 away from the measuring plunger 10. The measuring plunger 10 has a measuring end face 33, and the height of the cavity matching portion 16 is higher than the height of the measuring end face 33.

[0026] Furthermore, the fixing structure 13 includes a connecting sleeve 17 and a fixing screw 18, the cylinder 9 includes a cylinder body 19 and a cylinder push rod 20, a cylinder inner cavity 30 is formed in the cylinder body 19, one end of the cylinder push rod 20 extends into the cylinder inner cavity 30 and is slidably connected to the cylinder body 19, the cylinder push rod 20 has a piston extension end 21, and the piston extension end 21 is arranged on the part of the cylinder push rod 20 extending out of the cylinder inner cavity 30, a connecting groove 22 is provided on the connecting sleeve 17, the connecting sleeve 17 is sleeved on the piston extension end 21 through the connecting groove 22 and is threadedly connected to the piston extension end 21, the bottom end of the measuring plunger 10 extends into the connecting groove 22 and is connected to the connecting sleeve 17, one end of the fixing screw 18 passes through the grating scale 12, the connecting sleeve 17 and the measuring plunger 10 in sequence and extends into the connecting groove 22 to thread the grating scale 12, the connecting sleeve 17 and the measuring plunger 10. Specifically, in this embodiment, the grating ruler 12 is connected to the measuring plunger 10 through the fixing structure 13, ensuring that the displacement of the measuring plunger 10 can be accurately measured and recorded during the pressurization process. The grating ruler 12 is a high-precision displacement measurement tool, and its measurement accuracy directly affects the measurement accuracy of the entire device. Therefore, the design of the fixing structure 13 must ensure that the connection between the grating ruler 12 and the measuring plunger 10 is stable, and that the grating ruler 12 will not be displaced due to the movement of the measuring plunger 10 during the measurement process.

[0027] Furthermore, a cover plate 23 is provided on the end of the measuring plunger housing 11 away from the cylinder 9, and the cover plate 23 is installed on the measuring plunger housing 11 by screws. A locking structure is provided between the cover plate 23 and the cylinder 9, and the locking structure includes a locking nut 24 and a stud screw 25. One end of the stud screw 25 is threadedly connected to the top of the cylinder 9, and the other end of the stud screw 25 abuts against the cover plate 23, and one end of the locking nut 24 passes through the cover plate 23 and is threadedly connected to the stud screw 25. Specifically, in the present embodiment, the design of the locking structure ensures a firm connection between the measuring plunger housing 11 and the cylinder 9, and prevents loosening or displacement due to force during the supercharging process, thereby ensuring the stability and reliability of the entire device. The combined use of the stud screw 25 and the locking nut 24 makes the connection more secure, and can effectively resist various forces generated during the supercharging process. In addition, the cover plate 23 can protect the internal structure of the measuring plunger housing 11 and prevent the entry of debris or dust, and can also serve as a support point for installing other accessories, thereby improving the practicality of the entire device.

[0028] Further, one side of the boosting mechanism 4 is connected in series with another boosting mechanism 4 of the same structure, and the boosting mechanisms 4 are connected in series through pipelines, and a manual ball valve 26 is arranged on the pipeline. Specifically, in the present embodiment, the test piece 6 is a hydraulic control element, which can be various hydraulic valves with leakage. According to the use requirements of different test pieces 6, since the metering device will have the problem of limited range Q3, another boosting mechanism 4 can be connected in series on the basis of the original boosting mechanism 4, and a manual ball valve 26 is arranged between the two boosting mechanisms 4. When the range needs to be widened, the manual ball valve 26 can be opened. In the present scheme, the manual ball valves are respectively arranged between the measuring plunger housing and between the cylinders, and there are two manual ball valves for series connection between the cylinders. The manual ball valves between the cylinders respectively connect the parts of the two cylinders located at the upper part of the cylinder push rod and the parts of the two cylinders located at the lower part of the cylinder push rod. In addition, the scheme can also realize continuous measurement, solving the problem of insufficient range caused by long test time.

[0029] Furthermore, a muffler 27 is provided on one side of the reversing valve 3, and the muffler 27 is connected to the reversing valve 3 through a pipeline. Specifically, in this embodiment, the provision of the muffler 27 can effectively reduce the noise generated when the reversing valve 3 is working, and improve the working environment of the entire device.

[0030] In one embodiment, the air source 1 is a compressed air source, which provides a power pressure P0 for the cylinder 9 through the pressure reducing valve 2. The reversing valve 3 is provided with an electromagnet SV4 and an electromagnet SV3. The electromagnet SV4 and the reversing valve 3 are energized to extend the piston rod of the cylinder 9, push the measuring plunger 10 upward, and keep a certain load pressure F at the measured port of the test piece 6. L . Leakage in the test piece 6 will cause the movement of the measuring plunger 10, and the movement amount S1 can be converted into the required leakage amount Q2 of the measured element by calculation of the upper computer. Specifically, the method of implementing this embodiment is to energize the electromagnet SV1 on the first control valve 7, and the electromagnet SV3 on the reversing valve 3 to retract the piston rod of the cylinder 9, driving the measuring plunger 10 to move downward. Under the action of atmospheric pressure, the chamber in the measuring plunger housing 11 absorbs oil, and the oil absorption process is achieved at a low speed to ensure that the chamber and the pipeline connected thereto enter enough oil; the electromagnet SV4 on the reversing valve 3 is energized to extend the piston rod of the cylinder 9, pushing the measuring plunger 10 upward, and at this time, the inner cavity of the measuring plunger housing 11 is drained of oil. The oil discharge process needs to be slow to achieve the exhaust effect. It can be judged whether it is exhausted by observing the state of bubbles in the transparent oil barrel 5 and the transparent oil pipe; this operation needs to be repeated to ensure that there are no bubbles in the measuring plunger housing 11 and the pipeline connected thereto. A small amount of bubbles can also be discharged by opening the exhaust screw.

[0031] In one embodiment, the electromagnet SV1 on the first control valve 7 loses power, at which time the first control valve 7 is closed, the electromagnet SV2 on the second control valve 8 is energized, and the second control valve 8 is opened, the electromagnet SV4 on the reversing valve 3 is energized to extend the piston rod of the cylinder 9, and the oil in the inner cavity of the measuring plunger housing 11 is pressed into the pipeline between the test piece 6 and the second control valve 8. This state is maintained, the grating ruler 12 host computer is cleared to start measuring the movement S1 of the plunger, and after a time T, the leakage amount Q2 of the test piece is obtained.

[0032] In one embodiment, a first pressure gauge 28 for detecting pressure is provided on one side of the measuring plunger housing 11, and a second pressure gauge 29 is provided between the reversing valve 3 and the pressure reducing valve 2. The first pressure gauge 28 and the second pressure gauge 29 are provided at corresponding positions of the pipeline. The first pressure gauge 28 detects the pressure of the first connection port of the measuring plunger housing 11, that is, the required load pressure P L The second pressure gauge detects the gas pressure provided by the gas source and reduced by the pressure reducing valve 2, that is, the gas pressure acting on the cylinder cavity 30 at the lower position of the piston rod, that is, the gas pressure P0 required to generate the required load pressure PL. Due to various pressure losses in actual applications, there is an error between the theoretical calculation value and the actual value, so it is necessary to adjust the output pressure of the pressure reducing valve 2 and the display value of the first pressure gauge according to the value detected by the second pressure gauge 29 to obtain the required load pressure P L .

[0033] In another embodiment, the compressed air source can be replaced with a hydraulic source to obtain a higher load demand pressure P L .

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressurized metering device, characterized in that: It includes an air source, a pressure reducing valve, a reversing valve, a pressurizing mechanism, a transparent oil barrel and a test piece connected by pipelines, wherein the pressure reducing valve and the reversing valve are sequentially arranged between the air source and the pressurizing mechanism, the two ends of the pressure reducing valve are respectively connected to the air source and the reversing valve, one end of the reversing valve is connected to the pressurizing mechanism and drives the pressurizing mechanism to move, and a first control valve and a second control valve are respectively arranged between the pressurizing mechanism and the transparent oil barrel and the test piece.

2. The pressurized metering device according to claim 1, characterized in that: The boosting mechanism includes a cylinder, a measuring plunger, a measuring plunger housing and a grating ruler. One end of the measuring plunger extends into the measuring plunger housing and slides with the measuring plunger housing. The other end of the measuring plunger is connected to the cylinder. The grating ruler is fixed on one end of the measuring plunger close to the cylinder. A fixed structure is arranged between the grating ruler and the measuring plunger. The grating ruler is connected to the measuring plunger through the fixed structure.

3. The pressurized metering device according to claim 2, characterized in that: A shell cavity is formed in the measuring plunger shell, and the shell cavity has an inner cavity body part and a cavity matching part. A sealing structure is arranged between the shell cavity and the measuring plunger, and the sealing structure includes an oil seal and a sealing ring. The measuring plunger has a measuring end face, and the height of the cavity matching part is higher than the height of the measuring end face.

4. The pressurized metering device according to claim 2, characterized in that: The fixing structure includes a connecting sleeve and a fixing screw. The cylinder includes a cylinder body and a cylinder push rod. A cylinder inner cavity is formed in the cylinder body. One end of the cylinder push rod extends into the cylinder inner cavity and is slidably connected to the cylinder body. The cylinder push rod has a piston extension end. The piston extension end is arranged on the part of the cylinder push rod extending out of the cylinder inner cavity. A connecting groove is provided on the connecting sleeve. The connecting sleeve is arranged on the piston extension end through the connecting groove and is threadedly connected to the piston extension end. The bottom end of the measuring plunger extends into the connecting groove and is connected to the connecting sleeve. One end of the fixing screw passes through the grating scale, the connecting sleeve and one end of the measuring plunger and extends into the connecting groove in sequence to thread the grating scale, the connecting sleeve and the measuring plunger to be threadedly connected.

5. The pressurized metering device according to claim 2, characterized in that: A cover plate is arranged on the end of the measuring plunger housing away from the cylinder, and the cover plate is mounted on the measuring plunger housing by screws. A locking structure is arranged between the cover plate and the cylinder, and the locking structure includes a locking nut and a stud screw. One end of the stud screw is threadedly connected to the top end of the cylinder, and the other end of the stud screw abuts against the cover plate, and one end of the locking nut passes through the cover plate and is threadedly connected to the stud screw.

6. The pressurized metering device according to claim 1, characterized in that: Another boosting mechanism with the same structure is arranged in series on one side of the boosting mechanism, and the boosting mechanisms are connected in series via a pipeline, and a manual ball valve is arranged on the pipeline.

7. The pressurized metering device according to claim 1, characterized in that: A muffler is arranged on one side of the reversing valve, and the muffler is connected to the reversing valve through a pipeline.

Images