CN111855109B - Check valve opening pressure and sealing test device - Google Patents
Check valve opening pressure and sealing test device Download PDFInfo
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- CN111855109B CN111855109B CN202010745435.4A CN202010745435A CN111855109B CN 111855109 B CN111855109 B CN 111855109B CN 202010745435 A CN202010745435 A CN 202010745435A CN 111855109 B CN111855109 B CN 111855109B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a check valve opening pressure and sealing test device, which is characterized in that a single-acting spring reset cylinder is adopted as an engine oil pressure supply source, engine oil is arranged on a spring upper cavity of the single-acting spring reset cylinder, and an outlet of the spring upper cavity of the single-acting spring reset cylinder is communicated with an oil tank through a pipeline and a reversely connected check valve; the pressure is stably controlled by the pressure reducing valve, so that the pressure of the test engine oil is stably controlled by the single-action spring reset cylinder, and the precision of the test pressure is ensured; the leakage rate of a workpiece is equivalently tested by using a sealing test volume pipeline with a certain volume, so that the sealing test feasibility and reliability are ensured; the invention solves the heating problem caused by the heating of the engine oil caused by the continuous operation of the engine oil pump, the pressure precision problem of the sealing test of the test system and the problems of the type selection and the cost of the flow sensor for the test.
Description
Technical Field
The invention relates to the field of performance test of a check valve of an engine oil sump, in particular to a check valve opening pressure and sealing test device.
Background
Check valves, also known as check valves or back valves, are used in hydraulic systems to prevent reverse flow of oil or in pneumatic systems to prevent reverse flow of compressed air. The automobile oil sump is provided with a plurality of check valves, and during the starting and working processes of the engine, the check valves control the supply of lubricating oil of some parts of the engine, play a key role in lubricating and cooling the parts of the engine and directly influence the service life of the engine.
The check valve leakage and opening pressure detection is particularly important, and many engine failures are caused by a functional failure or leakage of the check valve mounted on the engine oil pan. Two important test parameters of the check valve: the sealing performance of the check valve under a certain oil pressure, such as the leakage amount of less than or equal to 20ml/m under the oil pressure of 120 kpa; during the process that the oil circuit pressure is continuously increased, the check valve is opened, and the pressure is maintained at a certain oil pressure value, such as: the opening pressure is 300-400 kpa.
As shown in fig. 1, a check valve test flow for the conventional design concept: the method comprises the following steps that (1) pressure testing is carried out, an oil pump works, engine oil flows to a test workpiece along a first branch circuit and a flow sensor, the computer records the pressure of the front end of the test workpiece in the test process of the pressure sensor, and the opening pressure of the test workpiece is calculated according to recorded data; and sealing test, wherein engine oil reaches a test workpiece along the second branch, the flow sensor and the test workpiece, the computer records the flow value in the test process of the flow sensor, and the leakage value of the test workpiece is calculated according to the recorded data.
There are problems in the current tests: the test pressure in the system is lower, the oil pump is not easy to select, and after the oil pump runs, the oil temperature is easy to increase along with the increase of the working time of the oil pump, so that the sealing and opening pressure test is influenced; the requirement on an engine oil pressure regulating valve (a second branch) for sealing in the test system after the oil pump is selected is strict, and the pressure control range of the test precision of 120+ -5kpa required by the test cannot be basically guaranteed; the flow sensor is expensive in the market and can be selected in a small variety.
Disclosure of Invention
In order to solve the problem that oil pump continuously operates to cause engine oil to generate heat in the check valve test in the prior art, the invention provides a check valve opening pressure and sealing test device, which ensures the pressure stability and temperature accuracy of a system, the reliability of the sealing test and the precision of the opening pressure test.
Therefore, the technical scheme of the invention is as follows: the utility model provides a check valve opening pressure and sealed testing arrangement, includes the oil tank, is equipped with machine oil in the oil tank, its characterized in that: a single-acting spring reset cylinder is used as an engine oil pressure supply source, engine oil is filled in a spring upper cavity of the single-acting spring reset cylinder, and a lower cavity air inlet of the single-acting spring reset cylinder is connected with an air source through a first pipeline for a first reversing valve and a first pressure reducing valve;
an outlet of an upper spring cavity of the single-acting spring reset cylinder is connected with an upper port of a sealed test volume pipeline through a second pipeline through a channel of a second electromagnetic directional valve and a fourth electromagnetic directional valve, a lower port of the sealed test volume pipeline is connected with a test workpiece installation pipeline, a liquid level detection photoelectric switch is installed on the side edge of the lower end of the test workpiece installation pipeline, and a first pressure sensor is installed on the side edge of the test workpiece installation pipeline;
the test workpiece is connected to the end part of the test workpiece mounting pipeline and is positioned above the oil tank;
the outlet of the upper spring cavity of the single-acting spring reset cylinder is simultaneously communicated with the oil tank through a third pipeline and a reversely connected one-way valve;
and the air source is connected with the upper port of the sealed test volume pipeline through a fourth pipeline through another channel of the second pressure reducing valve, the third reversing valve and the fourth electromagnetic reversing valve.
The technical scheme is further limited as follows: the main pressure reducing valve is arranged at the air source and combined with the first pressure reducing valve and the second pressure reducing valve, so that the air pressure of compressed air can be adjusted more conveniently.
The technical scheme is further limited as follows: a second pressure sensor is arranged at an air inlet of a lower cavity of the single-action spring reset cylinder to detect air pressure at the air inlet and ensure reliable operation of the single-action spring reset cylinder.
The invention has the beneficial effects that: the invention ensures the pressure stability and temperature accuracy of the system and the rapidity of the system test; the pressure is stably controlled by the pressure reducing valve, so that the pressure of the test engine oil is stably controlled by the single-action spring reset cylinder, and the precision of the test pressure is ensured; the leakage rate of the workpiece is equivalently tested by using a sealing test volume pipeline with a certain volume, so that the sealing test feasibility and reliability are ensured. The invention solves the heating problem caused by the heating of the engine oil caused by the continuous operation of the engine oil pump, the pressure precision problem of the sealing test of the test system and the problems of the type selection and the cost of the flow sensor for the test.
Drawings
Fig. 1 is a schematic diagram of a check valve test in the prior art.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 2, the opening pressure and sealing test device for the check valve comprises an oil tank, wherein organic oil is filled in the oil tank, a single-acting spring reset cylinder 1 is used as an oil pressure supply source, the oil is filled in a spring upper cavity of the single-acting spring reset cylinder 1, and an air inlet of a lower cavity of the single-acting spring reset cylinder is connected with an air source P through a first reversing valve DT1 and a first pressure reducing valve YI by a first pipeline;
an outlet of an upper spring cavity of the single-acting spring reset cylinder 1 is connected with an upper port of a sealed test volume pipeline GD through a second pipeline through a channel of a second electromagnetic directional valve DT2 and a fourth electromagnetic directional valve DT4, a lower port of the sealed test volume pipeline is connected with a test workpiece installation pipeline, a detection liquid level photoelectric switch PH is installed on the side edge of the lower end of the sealed test volume pipeline, and a first pressure sensor EP1 is installed on the side edge of the test workpiece installation pipeline;
the test workpiece is connected to the end part of the test workpiece mounting pipeline and is positioned above the oil tank;
the outlet of the upper spring cavity of the single-acting spring reset cylinder 1 is simultaneously communicated with the oil tank through a third pipeline and a reversely connected one-way valve H;
and the air source P is connected with the upper port of the sealed test volume pipeline GD through a fourth pipeline through another channel of the second pressure reducing valve Y2, the third reversing valve DT3 and the fourth electromagnetic reversing valve DT 4.
As shown in fig. 2, a main pressure reducing valve Y0 is further provided at the air source P, and the main pressure reducing valve is combined with the first pressure reducing valve and the second pressure reducing valve to facilitate adjustment of the pressure of the compressed air.
As shown in fig. 2, a second pressure sensor EP2 is further disposed at the air inlet of the lower chamber of the single-acting spring-return cylinder to detect the air pressure at the air inlet, so as to ensure reliable operation of the single-acting spring-return cylinder.
The working principle of the invention is as follows: during testing, a test workpiece (one-way valve) is arranged in a test workpiece mounting pipeline, compressed air enters a lower cavity of a single-action spring reset cylinder 1, a cylinder piston moves upwards to compress engine oil in an upper cavity of the cylinder to form an engine oil pressure source, the one-way valve is closed, the engine oil enters the test workpiece along a second electromagnetic directional valve, a fourth electromagnetic directional valve and a sealed test volume pipeline and then enters an oil tank, and a computer records a pressure sensor value at the front end of the test workpiece and calculates an opening pressure value of the test workpiece; after the pressure test is finished, the air pressure of the lower cavity of the single-acting spring reset cylinder is cut off, the piston moves downwards under the action of the reset spring, the one-way valve is closed, and engine oil quickly enters the upper cavity of the cylinder from the oil tank for the next test cycle; meanwhile, compressed air of an air source enters the sealed test volume pipeline through the fourth electromagnetic directional valve, the compressed air pushes engine oil in the test sealed volume in a certain time, if a test workpiece leaks, liquid in the test sealed volume can be lowered downwards, when the liquid level drops to the detection liquid level photoelectric switch, the liquid level switch senses the change action of the liquid level, the computer detects corresponding signal change, and whether the seal is qualified is judged (the test volume is equivalent to the length L of a test pipeline, the length of the pipeline of the test volume and the representative test leakage value within a certain test time according to the leakage amount of unit time).
In the invention, a single-acting spring reset cylinder 1 is the prior art, and a reset spring 1-2 is arranged in a reset cavity (an upper cavity) of a common single-acting cylinder 1-1.
Claims (3)
1. The utility model provides a check valve opening pressure and sealed testing arrangement, includes the oil tank, is equipped with machine oil in the oil tank, its characterized in that: a single-acting spring reset cylinder is used as an engine oil pressure supply source, engine oil is filled in a spring upper cavity of the single-acting spring reset cylinder, and a lower cavity air inlet of the single-acting spring reset cylinder is connected with an air source through a first pipeline for a first reversing valve and a first pressure reducing valve;
an outlet of an upper spring cavity of the single-acting spring reset cylinder is connected with an upper port of a sealed test volume pipeline through a second pipeline through a channel of a second electromagnetic directional valve and a fourth electromagnetic directional valve, a lower port of the sealed test volume pipeline is connected with a test workpiece installation pipeline, a liquid level detection photoelectric switch is installed on the side edge of the lower end of the test workpiece installation pipeline, and a first pressure sensor is installed on the side edge of the test workpiece installation pipeline;
the test workpiece is connected to the end part of the test workpiece mounting pipeline and is positioned above the oil tank;
the outlet of the upper spring cavity of the single-acting spring reset cylinder is simultaneously communicated with the oil tank through a third pipeline and a reversely connected one-way valve;
and the air source is connected with the upper port of the sealed test volume pipeline through another channel of the second pressure reducing valve, the third reversing valve and the fourth electromagnetic reversing valve by a fourth pipeline.
2. A check valve opening pressure and sealing test device according to claim 1, wherein: and a main pressure reducing valve is arranged at the gas source.
3. A check valve opening pressure and sealing test device according to claim 1 or 2, wherein: and a second pressure sensor is arranged at the air inlet of the lower cavity of the single-action spring reset cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745435.4A CN111855109B (en) | 2020-07-29 | 2020-07-29 | Check valve opening pressure and sealing test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010745435.4A CN111855109B (en) | 2020-07-29 | 2020-07-29 | Check valve opening pressure and sealing test device |
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| CN111855109A CN111855109A (en) | 2020-10-30 |
| CN111855109B true CN111855109B (en) | 2022-02-11 |
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| CN202010745435.4A Active CN111855109B (en) | 2020-07-29 | 2020-07-29 | Check valve opening pressure and sealing test device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112985801A (en) * | 2021-02-22 | 2021-06-18 | 一汽解放汽车有限公司 | System and method for testing opening pressure and sealing performance of check valve of fuel pump |
| CN114034449A (en) * | 2021-11-02 | 2022-02-11 | 上海中船三井造船柴油机有限公司 | Device and method for checking tightness of gas inlet valve |
| CN114323633B (en) * | 2021-12-30 | 2024-01-30 | 浙江瑞立空压装备有限公司 | Testing device and method for overflow valve |
| CN114922807B (en) * | 2022-06-09 | 2024-01-26 | 中车青岛四方机车车辆股份有限公司 | Intelligent detection system for air compressor component of railway vehicle |
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| JP2005273705A (en) * | 2004-03-23 | 2005-10-06 | Aisin Seiki Co Ltd | Valve tester |
| CN1687731A (en) * | 2005-04-30 | 2005-10-26 | 武汉理工大学 | Equipment for testing valve performance of oil fuel pump |
| CN201844909U (en) * | 2010-10-12 | 2011-05-25 | 潍柴动力(潍坊)再制造有限公司 | Tightness test machine for remanufacturing oil bottom case and pressure limiting valve |
| CN106918449A (en) * | 2015-12-24 | 2017-07-04 | 曼胡默尔滤清器（上海）有限公司 | The measurement apparatus and method of non-return valve opening pressure in a kind of oil filter |
| CN207336041U (en) * | 2017-09-01 | 2018-05-08 | 新昌县泰思特科技有限公司 | A kind of grease pump opening pressure detecting device |
| CN207439617U (en) * | 2017-09-21 | 2018-06-01 | 福建天广消防有限公司 | A kind of check valve multifunction test device |
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2020
- 2020-07-29 CN CN202010745435.4A patent/CN111855109B/en active Active
Patent Citations (6)
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| JP2005273705A (en) * | 2004-03-23 | 2005-10-06 | Aisin Seiki Co Ltd | Valve tester |
| CN1687731A (en) * | 2005-04-30 | 2005-10-26 | 武汉理工大学 | Equipment for testing valve performance of oil fuel pump |
| CN201844909U (en) * | 2010-10-12 | 2011-05-25 | 潍柴动力(潍坊)再制造有限公司 | Tightness test machine for remanufacturing oil bottom case and pressure limiting valve |
| CN106918449A (en) * | 2015-12-24 | 2017-07-04 | 曼胡默尔滤清器（上海）有限公司 | The measurement apparatus and method of non-return valve opening pressure in a kind of oil filter |
| CN207336041U (en) * | 2017-09-01 | 2018-05-08 | 新昌县泰思特科技有限公司 | A kind of grease pump opening pressure detecting device |
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| 一种单向阀试验台的设计;孙晋龙等;《液压与气动》;20200315(第03期);152-157 * |
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Inventor after: Wu Hualu Inventor after: Lu Minghua Inventor after: Wang Yongsheng Inventor before: Wu Hualu |
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