CN111721482A

CN111721482A - Pressure test device for detecting one-way valve, detection device and method for detecting one-way valve

Info

Publication number: CN111721482A
Application number: CN201910222192.3A
Authority: CN
Inventors: 李垂孝; 浦卫华; 李翔; 张文正; 郑圣彬; 杨涛
Original assignee: 711th Research Institute of CSIC
Current assignee: Shanghai Marine Diesel Engine Research Institute; 711th Research Institute of CSIC
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-09-29

Abstract

The invention provides a pressure test device for detecting a one-way valve, a detection device and a method for detecting the one-way valve. The pressure testing device comprises a shell, the shell comprises a first cavity and a second cavity communicated with the first cavity, the first cavity is provided with a first opening used for communicating an internal channel of a first pipeline, the second cavity is provided with a second opening used for communicating an internal channel of a second pipeline, the internal space of the first cavity is used for being hermetically connected with a one-way valve, when the one-way valve is arranged in the first cavity, the first opening is communicated with an inlet of the one-way valve, the second cavity is communicated with an outlet of the one-way valve, and the one-way valve isolates the first opening from the second cavity. Therefore, the pressure testing device has high precision for detecting the circulation and the sealing performance of the one-way valve; the pressure testing device simulates the state of the check valve installed in the prechamber, so that the result of detecting the performance of the check valve used in the prechamber of the internal combustion engine through the pressure testing device is more accurate.

Description

Pressure test device for detecting one-way valve, detection device and method for detecting one-way valve

Technical Field

The present invention relates generally to the field of internal combustion engine technology, and more particularly to a pressure test device for detecting a check valve, a detection device, and a method of detecting a check valve.

Background

Nowadays, because the marine internal combustion engine needs energy conservation and emission reduction, the application of natural gas as fuel in the marine power industry is greatly popularized. Since the marine natural gas engine with the precombustion chamber structure can achieve high thermal efficiency and low emission through a lean combustion technology, the marine natural gas engine is widely applied to the marine power industry.

A one-way valve is arranged in a pre-combustion chamber of a marine natural gas engine, and the performance (the circulation and the sealing performance) stability of a single one-way valve directly influences the air-fuel ratio in the pre-combustion chamber. And the uniformity of performance among the check valves of the cylinders of the engine (performance parameters are within a preset range) affects the uniformity of combustion of the cylinders (the efficiency of combustion of the cylinders is within a preset range). That is, the performance stability of a single check valve and the consistency of performance between multiple check valves directly affect the overall performance of the engine.

The existing check valve comprises a valve rod, a valve seat and a steel ball. The existing check valve is widely used in an internal combustion engine because of its low cost. However, the sealing form of the check valve is rigid sealing, and the machining quality precision of the check valve is not high. Therefore, when the check valve operates under different working conditions (the working pressure of the check valve is different), the performance of the check valve is unstable, i.e. the performance stability of a single check valve is poor, and the performance consistency among a plurality of check valves is poor.

In order to solve the above problems, the prior art adopts a method one and a method two. The method measures each check valve and compares the measurements to select the appropriate check valve, although method one is inefficient and costly. In the second method, the check valve is arranged in the precombustion chamber body for testing, so that the performance stability of a single check valve and the performance consistency among a plurality of check valves can be directly reflected. But the second method has high test difficulty and poor operability.

Therefore, it is desirable to provide a pressure testing device, a detection device and a method for detecting a check valve to at least partially solve the above-mentioned problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description section. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above technical problems, according to one aspect of the present invention, there is provided a pressure test device for testing a check valve, the pressure test device including a housing including a first chamber and a second chamber communicating with the first chamber, the first chamber having a first opening for communicating with an internal passage of a first pipe, the second chamber having a second opening for communicating with an internal passage of a second pipe, an internal space of the first chamber being for hermetically connecting the check valve, when the check valve is disposed in the first chamber, the first opening communicates with an inlet of the check valve, the second chamber communicates with an outlet of the check valve, and the check valve isolates the first opening from the second chamber.

According to the pressure test device for detecting the one-way valve, the pressure test device has high precision of detecting the circulation and the sealing performance of the one-way valve; the internal structure of the pressure testing device is approximately the same as the structure in the pre-combustion chamber of the internal combustion engine provided with the one-way valve, the pressure testing device simulates the state of the one-way valve installed in the pre-combustion chamber, and therefore the result of detecting the performance of the one-way valve of the pre-combustion chamber of the internal combustion engine through the pressure testing device is more accurate.

Optionally, the housing is a cylindrical structure.

Optionally, a communication hole is formed between the first cavity and the second cavity, the first cavity and the second cavity are communicated through the communication hole, and the inner diameter of the communication hole is the same as the inner diameter of the outlet of the one-way valve.

Optionally, the first cavity and the second cavity are both circular holes, and the first cavity, the second cavity and the communication hole are coaxially arranged.

Optionally, a position in the first cavity, which is communicated with the second cavity, is a sealing surface, the pressure test device further comprises a sealing gasket, and when the check valve is installed in the first cavity, the outlet of the check valve presses the sealing gasket against the sealing surface to seal a gap between the sealing surface and the outlet of the check valve.

Optionally, the first cavity further has a third opening, and the third opening is provided with an internal thread for connecting the check valve; and/or the first opening is provided with an internal thread; and/or the second opening is provided with an internal thread.

The invention also provides a detection device for detecting the check valve, which comprises: a compressed gas tank; the pressure gauge is communicated with a gas tank outlet of the compressed gas tank; a flow meter; and the aforesaid pressure testing device, wherein, one of first opening and the second opening of pressure testing device communicates with the entry of flowmeter, and another and jar export intercommunication.

According to the detection device for detecting the one-way valve, the detection device for detecting the one-way valve comprises the pressure testing device, and the pressure testing device is high in precision of detecting the circulation and the sealing performance of the one-way valve; the internal structure of the pressure test device is approximately the same as the structure in the pre-combustion chamber of the internal combustion engine provided with the check valve, and the pressure test device simulates the state of the check valve installed in the pre-combustion chamber, so that the result of detecting the performance of the check valve of the pre-combustion chamber of the internal combustion engine through the detection device is more accurate.

Optionally, the detection apparatus further comprises: a first pipe joint connecting the first opening and the internal passage of the first pipe; and a second pipe fitting communicating the second opening and the interior passage of the second pipe.

The invention also provides a method for detecting the check valve by the detection device for detecting the check valve, which comprises the following steps: step S1, connecting the check valve to be detected in the first cavity in a sealing manner; step S2, the compressed air tank leads the pressure testing device to be tested for a preset time TSetting a pressure value P of the gas, reading and recording a plurality of Q values of the flowmeter, and determining an average value Qa of the Q values according to the Q values, wherein the Q value is the reading of the flowmeter; step S3, repeating the step S2 for multiple times, wherein the preset pressure value P in the step S2 is different every time, and the preset time length T in the step S2 is the same every time; step S4, according to multiple Q values and Q in each step S2_aThe stability flow rate deviation value a is determined for each Q value in each step S2.

According to the method for detecting the one-way valve, the one-way valve is detected by the detection device for detecting the one-way valve, the detection device for detecting the one-way valve comprises a pressure testing device, and the pressure testing device is high in precision of detecting the liquidity and the sealing property of the one-way valve; the internal structure of the pressure test device is approximately the same as the structure in the pre-combustion chamber of the internal combustion engine provided with the check valve, and the pressure test device simulates the state of the check valve installed in the pre-combustion chamber, so that the result of detecting the performance of the check valve of the pre-combustion chamber of the internal combustion engine through the detection device is more accurate.

Optionally, in step S4

Wherein A is a stability flow deviation value;

Q_ais the average of all Q values in each step S2;

Q_ithe Q value in each step S2.

Optionally, the method further comprises step S5 after step S4, and step S5 comprises:

if all the stability flow deviation values A are within the preset stability flow deviation value range, it is determined that the check valve can be used for the internal combustion engine, otherwise the check valve cannot be used for the internal combustion engine.

Optionally, the method is used for detecting a plurality of check valves, and correspondingly, after step S3, the method further includes:

step S6, according to Q of each check valve at each preset pressure value P_aDetermining Q of all the check valves at each preset pressure value P_aAverage value Q of_b；

Step S7, according to Q of each check valve at each preset pressure value P_aAnd Q corresponding to each preset pressure value P_bAnd determining a consistent flow deviation value B of each one-way valve at each preset pressure value P.

Optionally, in step S7

Wherein B is a consistent flow deviation value;

Q_aan average value of all Q values in step S2 for each check valve at each preset pressure value P;

Q_bq in step S2 for all check valves at each preset pressure value P_aAverage of the values.

Optionally, the method further comprises step S8 after step S7, and step S8 comprises: if all the consistent flow deviation values B are within the preset consistent flow deviation value range, the plurality of one-way valves can be used for the same internal combustion engine; otherwise, the check valve with the consistency flow deviation value B within the preset consistency flow deviation value range and the new check valve are enabled to execute the steps S1 to S3, and the steps S6 to S8 again.

Optionally, the stability flow deviation values a of the plurality of check valves are all within the preset stability flow deviation value range.

Drawings

In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.

Fig. 1 is a schematic sectional view of a pressure test apparatus according to a first preferred embodiment of the present invention;

FIG. 2 is a schematic right-side view of FIG. 1;

FIG. 3 is a schematic view of a detecting unit according to a first preferred embodiment of the present invention; and

fig. 4 is a schematic view of a detecting unit according to a second preferred embodiment of the present invention.

Description of reference numerals:

100: pressure test device 110: shell body

111: first cavity 111 a: third opening

111 b: first opening 112: second cavity

112 a: second opening 113: communicating hole

120: sealing gasket 130: compressed gas tank

140: pressure gauge 150: flow meter

160: one-way valve

200: pressure testing device 211 b: first opening

212 a: second opening 230: compressed gas tank

240: pressure gauge 250: flow meter

260: one-way valve

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

Implementation mode one

The invention provides a detection device for detecting a check valve. The detection device of the present embodiment is used to detect the flow and the sealing of the check valve 160 of the prechamber of the internal combustion engine. It will be appreciated that one skilled in the art can use the detection means of the present embodiment to detect other one-way valves 160.

As shown in fig. 1 to 3, the detection device of the present embodiment includes a pressure test device 100 for detecting a check valve.

As shown in fig. 1 and 2, the pressure testing device 100 of the present embodiment includes a housing 110. Preferably, the housing 110 is a cylindrical structure. The housing 110 includes a first cavity 111. The first cavity 111 is used to accommodate the check valve 160. The check valve 160 may be integrally provided in the first chamber 111, and in this case, the length of the first chamber 111 in the longitudinal direction (the left-right direction in fig. 1) of the pressure testing device 100 is greater than or equal to the length of the check valve 160. The check valve 160 may also be only partially disposed within the first cavity 111. In this embodiment, the check valve 160 is integrally provided in the first chamber 111.

Preferably, the first chamber 111 has a third opening 111a, and the third opening 111a is used to dispose the check valve 160 into the first chamber 111. Specifically, the check valve 160 is provided with external threads thereon. The third opening 111a is provided with an internal thread corresponding to the external thread of the check valve 160. Thus, the check valve 160 is inserted into the first chamber 111 through the third opening 111a, and then the check valve 160 is screwed into the third opening 111a, so that the check valve 160 is fixedly coupled into the first chamber 111. Thus, the operation of installing the check valve 160 is simple.

In this embodiment, the check valve 160 and the first cavity 111 are hermetically connected, so that the gas in the first cavity 111 can be prevented from leaking out of the pressure testing device 100 through the connection part of the pressure testing device 100 and the check valve 160. Specifically, the pressure testing device 100 of the check valve 160 further includes a first seal ring disposed between the first opening 111b and the third opening 111 a. When the check valve 160 and the third opening 111a are screwed together in this way, the first seal ring is positioned in the gap between the inner wall surface of the first cavity 111 and the outer wall surface of the check valve 160 to seal the gap between the inner wall surface of the first cavity 111 and the outer wall surface of the check valve 160, thereby preventing the gas in the first cavity 111 from leaking out of the pressure testing device 100 from the third opening 111a of the pressure testing device 100. The first opening 111b will be described later.

In this embodiment, as shown in fig. 1, the first cavity 111 has a first opening 111b, and the first opening 111b is disposed on a sidewall of the pillar structure. The first opening 111b is located on the right side of the third opening 111a in the left-right direction of fig. 1. The dimension between the center of the first opening 111b and the right end of the internal thread is substantially equal to the dimension of the air inlet of the check valve 160 and the end of the external thread facing the air inlet of the check valve 160. Thus, when the check valve 160 is screwed into the third opening 111a, the inlet of the check valve 160 communicates with the first opening 111 b.

In the present embodiment, the first opening 111b is used to communicate with the internal passage of the first duct. Specifically, the detection device comprises a pipe joint for connecting a pipeline and a pipe joint sealing gasket made of elastic materials (such as rubber), wherein the pipe joint sealing gasket is a hollow gasket, the pipe joint comprises a first pipe joint and a second pipe joint, and the pipe joint sealing gasket comprises a first pipe joint sealing gasket and a second pipe joint sealing gasket. The first opening 111b is connected to a first pipe by a first pipe joint. At this time, the inner passage of the first pipe communicates with the inlet of the check valve 160.

Preferably, the pipe joint is provided with an external thread, the first opening 111b is provided with an internal thread corresponding to the external thread of the pipe joint, and the first pipe joint is threadedly coupled with the first opening 111 b. Thereby, the first pipe is conveniently mounted to the first opening 111 b. In this embodiment, the first pipe joint gasket is provided between the first pipe joint and the first opening 111b, and when the first pipe joint is screwed into the first opening 111b, the first pipe joint presses the first pipe joint gasket against the first opening 111b, so that the first pipe joint gasket seals a gap between the first pipe joint and the first opening 111b, and prevents gas in the first chamber 111 from leaking out of the pressure testing device 100 from a joint between the first pipe joint and the first opening 111 b.

In this embodiment, the housing 110 further includes a second cavity 112 communicating with the first cavity 111. When the check valve 160 is disposed in the first chamber 111 by, for example, screw-coupling with the third opening 111a, the check valve 160 isolates the first opening 111b from the second chamber 112. In this way, when the check valve 160 is disposed in the first chamber 111, it is possible to prevent the gas inside the second chamber 112 from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the first opening 111b, or to prevent the gas at the first opening 111b from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the inside of the second chamber 112.

Specifically, the position in the first cavity 111, which is communicated with the second cavity 112, is a sealing surface, and the sealing surface is a plane. The pressure testing device 100 further includes a sealing gasket 120, and the sealing gasket 120 is a hollow ring. The end surface of the check valve 160 where the outlet is located is a flat surface. When the check valve 160 is screwed to the third opening 111a, the end face where the outlet of the check valve 160 is located presses the sealing gasket 120 against the sealing surface, so that the sealing gasket 120 is located between the end face where the outlet of the check valve 160 is located and the sealing surface, and the sealing gasket 120 seals a gap between the end face where the outlet of the check valve 160 is located and the sealing surface on the basis of ensuring communication between the outlet of the check valve 160 and the second cavity 112. The gas in the second chamber 112 is prevented from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the first opening 111b, or the gas in the first opening 111b is prevented from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the second chamber 112. Preferably, the sealing gasket 120 is made of red copper. The sealing gasket 120 is formed by an annealing process, and the thickness of the sealing gasket 120 is 2 mm.

It can be understood that, in order to isolate the first opening 111b from the second chamber 112 by the check valve 160, the gas in the second chamber 112 is prevented from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the first opening 111b, or the gas in the first opening 111b is prevented from flowing from the gap between the outer wall surface of the check valve 160 and the inner wall surface of the first chamber 111 to the second chamber 112. Other arrangements may be made by those skilled in the art. For example, a second sealing ring is disposed in the first cavity 111, such that when the check valve 160 is screwed with the third opening 111a, the second sealing ring is located between the first opening 111b of the first cavity 111 and the second cavity 112, and the second sealing ring is located between an outer wall surface of an end of the check valve 160 where the outlet is located and an inner wall surface of the first cavity 111, to seal a gap between the outer wall surface of the end of the check valve 160 where the outlet is located and the inner wall surface of the first cavity 111, so that the check valve 160 isolates the first opening 111b from the second cavity 112.

In this embodiment, the second cavity 112 has a second opening 112 a. The second opening 112a is used to communicate with the internal passage of the second pipe. Specifically, the second opening 112a is connected to the second pipe by a second pipe joint. At this time, the inner passage of the second duct communicates with the second chamber 112.

Preferably, the second opening 112a is provided with an internal thread corresponding to an external thread of a pipe joint, and the second pipe joint is threadedly coupled with the second opening 112 a. Thereby, the installation of the second pipe to the second opening 112a is facilitated. In this embodiment, the second pipe joint sealing gasket is disposed between the second pipe joint and the second opening 112a, and when the second pipe joint is screwed into the second opening 112a, the second pipe joint presses the second pipe joint sealing gasket against the second opening 112a, so that the second pipe joint sealing gasket seals a gap between the second pipe joint and the second opening 112a, and prevents gas in the second chamber 112 from leaking out of the pressure testing device 100 from a joint between the second pipe joint and the second opening 112 a.

In the present embodiment, when the check valve 160 and the third opening 111a are screw-coupled, the second chamber 112 and the outlet of the check valve 160 communicate. Thus, the flow of gas through the check valve 160 can be detected by filling the inlet of the check valve 160 with gas through the first pipe communicating with the first opening 111b and then detecting the flow rate of gas in the second pipe communicating with the second opening 112 a. The sealing performance of the check valve 160 can be detected by filling gas into the outlet of the check valve 160 through the second pipe communicating with the second opening 112a and then detecting the flow rate of the gas in the first pipe communicating with the first opening 111 b. Because the check valve 160 is hermetically connected to the pressure testing device 100, and the check valve 160 isolates the first opening 111b from the second cavity 112, when the check valve 160 is installed in the pressure testing device 100, the pressure testing device 100 has good sealing performance and small air leakage, and the accuracy of detecting the flow performance and the sealing performance of the check valve 160 by the pressure testing device 100 of the present embodiment is high.

Preferably, a communication hole 113 is provided between the first and

second cavities

111 and 112. The first chamber 111 and the second chamber 112 are communicated through a communication hole 113, and the inner diameter of the communication hole 113 is the same as the outlet inner diameter of the check valve 160. Thus, the internal structure of the pressure testing device 100 is substantially the same as the structure in the pre-combustion chamber of the internal combustion engine in which the check valve 160 is provided. The pressure test device 100 can simulate a state in which the check valve 160 is installed in the prechamber, and therefore the result of detecting the check valve 160 for the prechamber of the internal combustion engine by the pressure test device 100 of the present embodiment is more accurate.

Further preferably, the first cavity 111 and the second cavity 112 are both circular holes. The first cavity 111 and the second cavity 112 are coaxially disposed with the communication hole 113. Therefore, the first cavity 111, the second cavity 112 and the communication hole 113 are conveniently processed.

Preferably, the housing 110 is made of # 45 steel. The housing 110 is integrally formed. The inner shape of the first cavity 111 corresponds to the outer shape of the check valve 160 so that the check valve 160 can be disposed within the first cavity.

The pressure testing device 100 of the embodiment has the advantages of simple structure, small volume, light weight, convenient processing and low cost. Meanwhile, the pressure testing device 100 is high in efficiency of detecting the one-way valve 160, and when the pressure testing device 100 is used for detecting the one-way valve 160, the pressure testing device 100 is airtight, interference factors cannot be generated, and the detection precision is high.

The detection device of the present embodiment further includes a compressed gas tank 130, a pressure gauge 140, and a flow meter 150. The compressed gas tank 130 is used to supply gas at a preset pressure. An inlet of the pressure gauge 140 communicates with a tank outlet of the compressed gas tank 130 to detect a gas pressure at the tank outlet of the compressed gas tank 130 in real time.

The compressed gas tank 130 and the pressure gauge 140 of the detection device of the present embodiment are communicated with the pressure testing device 100 through a high-pressure pipe. The pressure testing device 100 and the flow meter 150 are communicated through a high pressure conduit.

In this embodiment, as shown in fig. 3, the second opening 112a of the pressure testing device 100 may communicate with the inlet of the flow meter 150 to measure the gas flow rate at the second opening 112a in real time. The first opening 111b is now in communication with the gas tank outlet. Such that the detection means are used to detect the flow-through of the non-return valve 160. Specifically, the inlet of the flow meter 150 communicates with the second opening 112a through the inner passage of the second pipe. The tank outlet of the compressed gas tank 130 communicates with the first opening 111b through the internal passage of the first pipe. In this way, the compressed gas tank 130 provides gas at a predetermined pressure, and the gas at the predetermined pressure enters the check valve 160 through the outlet of the compressed gas tank 130, the first pipe, the first opening 111b, and the inlet of the check valve 160 in sequence, and then enters the internal passage of the second pipe from the outlet of the check valve 160 through the second chamber 112. The flow meter 150 detects the flow rate of the gas in the second pipe.

Preferably, the detection device for the check valve of the present embodiment further includes an experiment platform, and the pressure testing device 100 is fixedly disposed on the experiment platform. Thereby, the operation of connecting the check valve 160 into the first chamber 111 is facilitated.

The present invention also provides a first method of detecting the check valve 160. The first method of the present embodiment is for detecting the stability of the flow-through of a single check valve. The first method detects the stability of the flow-through of the check valve 160 by the aforementioned detection means. Specifically, the detection device of the first method is shown in fig. 3, and the first method includes:

step S1, hermetically connecting the check valve 160 to be detected into the first cavity 111;

step S2, the compressed air tank 130 supplies gas of a preset pressure value P of a preset duration T to the pressure testing device 100, reads and records a plurality of Q values (meter readings) of the flow meter 150, and determines an average Q value Q of the plurality of Q values according to the plurality of Q values_a。

Specifically, the compressed air switch of the compressed air tank 130 is opened, and the pressure is adjusted to 18bar (in the present embodiment, the flow-through of the check valve 160 at the gas pressures of 18bar, 23bar and 28bar is taken as an example, and the readings Q of the three flow meters 150 are taken for each gas pressure), at which time, the pressure of the output gas of the compressed air tank 130 is 18 bar. After the compressed gas tank 130 continuously outputs the gas with the pressure of 18bar for 1min (at this time, the pressure of the gas output by the compressed gas tank 130 is stable), the pressure is readA reading of the pressure gauge 140 and a reading Q of the flow meter 150 are taken and recorded. Wherein three Q values are read and recorded. The three Q values are QI1, QI2 and QI 3. Then, the average QI of QI1, QI2 and QI3 is determined_a。

Step S3, repeating the step S2 for multiple times, wherein the preset pressure value P in the step S2 is different every time, and the preset time length T in the step S2 is the same every time;

specifically, after the pressure is adjusted to 23bar, and the compressed gas tank 130 continuously outputs gas with a pressure of 23bar for 1min, the reading of the pressure gauge 140 and the reading Q of the flow meter 150 are read and recorded. Wherein three Q values are read and recorded. The three Q values are QII1, QII2 and QII 3. Then, the average value QII of QII1, QII2 and QII3 was determined_a。

After the pressure is adjusted to 28bar, the compressed gas tank 130 continuously outputs gas with the pressure of 28bar for 1min, and then the reading of the pressure gauge 140 and the reading Q of the flow meter 150 are read and recorded. Wherein three Q values are read and recorded. The three Q values are QIII1, QIII2 and QIII 3. The average QIII of QIII1, QIII2 and QIII3 was then determined_a。

Step S4, according to Q value and Q in each step S2_aThe stability flow rate deviation value a is determined for each Q value in each step S2.

According to Q value and Q of different gears_aAnd determining the stability flow deviation value A of each Q value of the gear.

In particular, for the gear with a pressure of 18bar, according to QI1 and QI_aAnd determining the stability flow deviation value AI1 of QI 1. According to QI2 and QI_aAnd determining the stability flow deviation value AI2 of QI 2. According to QI3 and QI_aAnd determining the stability flow deviation value AI3 of QI 3. AI1, AI2, and AI3 are recorded.

For the gear with a pressure of 23bar, according to QII1 and QII_aAnd determining the stability flow deviation value AII1 of QII 1. According to QII2 and QII_aAnd determining the stability flow deviation value AII2 of QII 2. According to QII3 and QII_aAnd determining the stability flow deviation value AII3 of QII 3. AII1, AII2 and AII3 were recorded.

For the gear at a pressure of 28bar, according to QII1 and QIII_aAnd determining the stability flow deviation value AIII1 of QIII 1. According to QIII2 and QIII_aAnd determining the stability flow deviation value AIII2 of QIII 2. According to QIII3 and QIII_aAnd determining the stability flow deviation value AIII3 of QIII 3. AIII1, AIII2 and AIII3 were recorded.

In the present embodiment, the check valve performance state (stability flow rate deviation value) can be simulated for different operating conditions of the internal combustion engine by varying the preset pressure in step S2 a plurality of times. For example, the output pressure of the compressed air tank 130 is 18bar, simulating the performance state of the check valve 160 under low operating conditions of the internal combustion engine; the output pressure of the compressed air tank 130 is 23bar, and the performance state of the check valve 160 under the intermediate working condition of the internal combustion engine is simulated; the output pressure of the compressed gas tank 130 is 28bar, simulating the behaviour of the non-return valve 160 in high operating conditions of the internal combustion engine. The low condition, the intermediate condition, and the high condition of the internal combustion engine in this embodiment may be the low condition, the intermediate condition, and the high condition of the marine internal combustion engine under the propulsion characteristic.

After step S4, the first method further includes a flow-through step S5 of determining the one-way valve 160. Step S5 includes determining that the check valve is enabled for use with the engine if all of the stability flow deviation values a are within the preset stability flow deviation value range, otherwise the check valve is not enabled for use with the engine.

Specifically, the preset stability flow deviation value range may be ± 10%. If each of the stability flow rate deviation values a of the check valve 160 at each pressure step (each of the preset pressure values P) is within a range of ± 10%, that is, the absolute values of all the stability flow rate deviation values a (each of AI1, AI2, AI3, AII1, AII2, AII3, AIII1, AIII2, and AIII 3) are less than or equal to 10%, the check valve 160 is qualified and can be used in an internal combustion engine. If the absolute value of any one of the stability flow rate deviation values a of the check valve 160 at any one of the first and second pressures is greater than 10%, that is, the absolute value of any one of the stability flow rate deviation values a (any one of AI1, AI2, AI3, AII1, AII2, AII3, AIII1, AIII2, and AIII 3) is greater than 10%, the check valve 160 is not qualified and cannot be used in the internal combustion engine. At this time, the internal structure of the check valve 160 needs to be adjusted, mainly the roughness of the steel ball of the check valve 160 and the taper angle of the end of the valve rod. After the check valve 160 is adjusted, steps S1 to S4 are repeated again, and if the absolute value of any one of the stability flow deviation values a is still greater than 10%, the check valve 160 is considered to be not satisfactory and not applicable to the internal combustion engine.

According to the method of detecting the flow property of the check valve 160, the flow property of the check valve 160 is detected by the detection device for a check valve described above, and the detection accuracy is high.

Preferably, the flow deviation value a may be determined by the following equation.

Wherein A is a stability flow deviation value;

Q_ais the average of all Q values in each step S2;

Q_ithe Q value in each step S2.

This further improves the detection accuracy.

The present invention also provides a second method of detecting the check valve 160. The second method detects consistency of the communication between the plurality of check valves 160 by the aforementioned detection means for check valves. The detection apparatus of the second method is the same as the detection apparatus of the first method. The stability flow deviation values a of the check valves 160 detected by the second method are all within the preset stability flow deviation value range. In other words, the check valves 160 having all the stability flow deviation values a qualified are selected in the first method, and then the selected qualified check valves 160 are subjected to the consistency of the flow. The second method differs from the first method in that:

the first method is used to detect the flow stability deviation value a of the individual check valves 160. The second method is used to detect a consistent flow deviation value B of flow between the plurality of one-way valves 160. Specifically, the second method detects the consistency of the flow properties among the plurality of check valves 160 by detecting the plurality of check valves 160 (the present embodiment is described by taking the example of detecting the consistency of the flow properties of three check valves 160). The steps S1, S2 and S3 of the second method for detecting each check valve 160 are the same as the steps S1, S2 and S3 of the first method, and are not repeated herein.

The second method completes the step S3 of checking each check valve 160 (at which time the average of all Q values for each check valve 160 at each gear pressure is determined.) for example, for a gear with a pressure of 18bar, the average of the first check valve 160 is Q1I_a Second check valve 160 has an average value of Q2I_aAnd the third check valve 160 has an average value of Q3I_a(ii) a For a gear with a pressure of 23bar, the first non-return valve 160 has an average value Q1II_a Second check valve 160 has an average value of Q2II_aAnd the third check valve 160 has an average value of Q3II_a(ii) a For a gear with a pressure of 28bar, the first non-return valve 160 has an average value of Q1III_aThe second check valve 160 has an average value of Q2III_aAnd the third check valve 160 has an average value of Q3III_a) Further comprising step S6 and step S7.

Step S6, according to Q of each check valve 160 at each preset pressure value P_aDetermining the Q of all the check valves 160 at each preset pressure value P_aAverage value Q of_b；

In particular, for a gear with a pressure of 18bar, according to Q1I_a、Q2I_aAnd Q3I_aDetermination of QI_b(ii) a For a gear with a pressure of 23bar, according to Q1II_a、Q2II_aAnd Q3II_aDetermination of QII_b(ii) a For a gear with a pressure of 28bar, according to Q1III_a、Q2III_aAnd Q3III_aDetermination of QIII_b。

Step S7, according to Q of each check valve 160 at each preset pressure value P_aAnd Q corresponding to each preset pressure value P_bA consistent flow deviation B is determined for each check valve 160 at each preset pressure value P.

In particular, for a gear with a pressure of 18bar, according to Q1I_aAnd QI_bThe first check valve is determined and recorded to be 18bar at the operating pressure (of the compressed gas tank 130)The temporal consistency flow offset value B1I; according to Q2I_aAnd QI_bDetermining and recording a consistency flow deviation value B2I of the second check valve when the working pressure is 18 bar; according to Q3I_aAnd QI_bA consistent flow deviation value B3I for the third check valve at an operating pressure of 18bar was determined and recorded.

For a gear with a pressure of 23bar, according to Q1II_aAnd QII_bDetermining and recording a consistency flow deviation value B1II of the first check valve when the working pressure is 23 bar; according to Q2II_aAnd QII_bDetermining and recording a consistency flow deviation value B2II of the second check valve when the working pressure is 23 bar; according to Q3II_aAnd QII_bA consistent flow deviation value B3II for the third non return valve at an operating pressure of 23bar was determined and recorded.

For a gear with a pressure of 28bar, according to Q1III_aAnd QIII_bDetermining and recording a consistency flow deviation value B1III of the first check valve when the working pressure is 28 bar; according to Q2III_aAnd QIII_bDetermining and recording a consistency flow deviation value B2III of the second one-way valve when the working pressure is 28 bar; according to Q3III_aAnd QIII_bAnd determining and recording a consistent flow deviation value B3III of the third check valve when the working pressure is 28 bar.

After step S7, the second method further includes step S8. Step S8 includes if all of the consistent flow deviation values B are within the preset consistent flow deviation value ranges, then multiple check valves can be used for the same engine; otherwise, the check valve with the consistency flow deviation value B within the preset consistency flow deviation value range and the new check valve are enabled to execute the steps S1 to S3, and the steps S6 to S8 again.

Specifically, the preset uniform flow deviation value range may be ± 10%. If each of the uniform flow deviations B at each of the shift pressures is within ± 10%, that is, the absolute value of all of the uniform flow deviations B (each of B1I, B2I, B3I, B1II, B2II, B3II, B1III, B2III, and B3 III) is less than or equal to 10%, it indicates that all of the check valves 160 are acceptable and can be used for the respective prechambers of the same internal combustion engine.

If the absolute value of the uniform flow deviation B at any first gear pressure of any one check valve 160 in all the check valves 160 is greater than 10%, that is, the absolute value of any one of the uniform flow deviations B (any one of B1I, B2I, B3I, B1II, B2II, B3II, B1III, B2III, and B3 III) is greater than 10%. It indicates that there is a failed one-way valve 160 of all one-way valves 160 (one-way valves 160 having a consistent flow deviation B of greater than 10% absolute value at any one gear pressure, e.g., the third one-way valve is failed). All the check valves 160 (first, second and third check valves) cannot be used for the respective prechambers of the same engine. At this time, the unqualified check valves 160 (third check valves) in all the check valves 160 may be removed, a new check valve 160 (fourth check valve) and the qualified check valves 160 (first check valve and second check valve) are selected to form a new check valve group (first check valve, second check valve and fourth check valve), and steps S1 to S3 and S6 to S8 are re-executed to determine the consistent flow deviation B of the new check valve group until all the check valves 160 of the new check valve group (first check valve, second check valve and fourth check valve) are qualified. Therefore, all the one-way valves for the same internal combustion engine can be determined to be qualified, uneven ignition of all cylinders of the internal combustion engine is avoided, and the probability of engine misfire or knocking is increased.

According to the method of detecting the consistency of the flow of the check valve 160, the consistency of the flow of the check valve 160 is detected by the detection device for a check valve, and the detection accuracy is high.

Preferably, the flow deviation value B may be determined by the following equation.

Wherein B is a consistent flow deviation value;

Q_athe average value of all Q values in step S2 for each check valve 160 at each preset pressure value P;

Q_bat each preset pressure value PQ of check valve 160 in step S2_aAverage of the values.

This further improves the detection accuracy.

Second embodiment

The differences between the second embodiment and the first embodiment are as follows:

in the present embodiment, as shown in fig. 4, the first opening 211b of the pressure testing device 200 communicates with the inlet of the flow meter 250 to measure the gas flow rate at the first opening 211b in real time. The second opening 212a is now in communication with the gas tank outlet. Such a detection device is used to detect the tightness of the check valve 260. Specifically, the inlet of the flow meter 250 communicates with the first opening 211b through the inner passage of the first pipe. The tank outlet of the compressed gas tank 230 communicates with the second opening 212a through the internal passage of the second pipe. In this way, the compressed gas tank 230 provides gas at a predetermined pressure, and the gas at the predetermined pressure enters the check valve 260 through the outlet of the compressed gas tank 230, the internal passage of the second pipe, the second opening 212a, the second cavity, and the outlet of the check valve 260 in sequence, and then enters the internal passage of the first pipe from the inlet of the check valve 260. The flow meter 250 detects the flow rate of the gas in the first pipe. The pressure gauge 240 in this embodiment may be the same as the pressure gauge 140 in the embodiments.

The present invention also provides a third method of detecting the check valve 260. The third method is a method of detecting the stability of the sealing performance of the check valve 260 by the check valve detection device according to the second embodiment. The third method is the same as the first method in the verification step. The step of determining the sealability of the check valve 260 is also the same as the step of determining the flowability of the check valve 260 of the first method. The third method is different from the first method only in the installation manner of the compressed gas tank 230 and the flow meter 250, the detection device of the first method is shown in fig. 3, and the detection device of the third method is shown in fig. 4.

According to the method of detecting the stability of the sealing performance of the check valve 260, the stability of the sealing performance of the check valve 260 is detected by the check valve detection device according to the second embodiment, and the detection accuracy is high.

The present invention also provides a fourth method of detecting the check valve 260. The fourth method is a method of detecting the consistency of the sealing performance between the plurality of check valves 260 by the check valve detection device according to the second embodiment. The fourth method is the same as the second method in the verification step. The procedure for determining the consistency of the sealing performance of the check valve 260 is also the same as the procedure for determining the consistency of the flow performance of the check valve 260 of the second method. The fourth method is different from the second method in that the compressed gas tank 230 and the flow meter 250 are installed in different manners, the sensing device of the second method is shown in fig. 3, and the sensing device of the fourth method is shown in fig. 4.

According to the method of detecting the consistency of the sealing performance between the check valves 260, the consistency of the sealing performance between the check valves 260 is detected by the detection device for check valves according to the second embodiment, and the detection accuracy is high.

The first method, the second method, the third method and the fourth method are simple to operate and high in test precision, practical problems are greatly solved, and cost is reduced.

The internal combustion engine applying the check valve determined by the first method, the second method, the third method and the fourth method can ensure the whole performance requirement of the internal combustion engine.

In the invention, according to the second method and the fourth method, a plurality of check valves with satisfactory consistency of flow and sealing can be selected, and the problem of poor combustion consistency of each cylinder of the internal combustion engine is solved.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a detect pressure testing device of check valve, a serial communication port, pressure testing device includes the casing, the casing include first cavity and with the second cavity of first cavity intercommunication, first cavity has the first opening that is used for the inside passage of intercommunication first pipeline, the second cavity has the second opening that is used for the inside passage of intercommunication second pipeline, the inner space of first cavity is used for sealing connection check valve, works as the check valve sets up when in the first cavity, first opening with the entry intercommunication of check valve, the second cavity with the export intercommunication of check valve, the check valve will first opening with the second cavity is kept apart.

2. The pressure testing device of claim 1, wherein the housing is a cylindrical structure.

3. The pressure testing device according to claim 1, wherein a communication hole is provided between the first chamber and the second chamber, the first chamber and the second chamber are communicated through the communication hole, and the inner diameter of the communication hole is the same as the outlet inner diameter of the check valve.

4. The pressure testing device according to claim 3, wherein the first cavity and the second cavity are both circular holes, and the first cavity, the second cavity and the communication hole are coaxially arranged.

5. The pressure testing device of claim 1, wherein the first chamber communicates with the second chamber at a sealing surface, and further comprising a sealing gasket, wherein when the check valve is installed in the first chamber, the sealing gasket is compressed against the sealing surface by the outlet of the check valve to seal a gap between the sealing surface and the outlet of the check valve.

6. The pressure testing device of claim 1, wherein the first cavity further has a third opening provided with an internal thread for connecting the one-way valve; and/or the first opening is provided with an internal thread; and/or the second opening is provided with an internal thread.

7. A test device for testing a check valve, the test device comprising:

a compressed gas tank;

the pressure gauge is communicated with a gas tank outlet of the compressed gas tank;

a flow meter; and

the pressure testing device of any one of claims 1 to 6, wherein one of the first opening and the second opening of the pressure testing device is in communication with an inlet of the flow meter and the other is in communication with the gas tank outlet.

8. The detection device according to claim 7, further comprising:

a first pipe fitting connecting the first opening and the internal passage of the first pipe; and

a second pipe fitting communicating the second opening and the interior passage of the second pipe.

9. A method of checking a check valve by the check valve checking device of claim 7 or 8, wherein the method comprises:

step S1, hermetically connecting the check valve to be detected to the first cavity;

step S2, the compressed air tank leads gas with preset pressure value P with preset duration T to the pressure testing device, a plurality of Q values of the flowmeter are read and recorded, and the average value Q of the plurality of Q values is determined according to the plurality of Q values_aWherein the Q value is a reading of the flow meter;

step S3, repeating step S2 for multiple times, where the preset pressure value P in step S2 is different each time, and the preset duration T in step S2 is the same each time;

step S4, according to the plurality of Q values and the Q in each of the steps S2_aA stability flow deviation value a is determined for each of the Q values in each of the steps S2.

10. Method of testing a non-return valve according to claim 9, characterised in that in said step S4

Wherein A is a stability flow deviation value;

Q_ais the average of all Q values in each of the steps S2;

Q_ifor each Q value in said step S2.

11. The method of testing a check valve of claim 9, further comprising a step S5 after the step S4, the step S5 comprising:

if all the stability flow deviation values A are within a preset stability flow deviation value range, determining that the one-way valve can be used for the internal combustion engine, otherwise, determining that the one-way valve cannot be used for the internal combustion engine.

12. The method of testing a check valve of claim 11, wherein the method is used for testing a plurality of check valves, and correspondingly, the method further comprises after the step S3:

step S6, according to the Q of each check valve at each preset pressure value P_aDetermining said Q of all said check valves at each of said preset pressure values P_aAverage value Q of_b；

Step S7, according to the Q of each check valve at each preset pressure value P_aAnd Q corresponding to each of the preset pressure values P_bAnd determining a consistent flow deviation value B of each one-way valve at each preset pressure value P.

13. Method of testing a non-return valve according to claim 12, characterised in that in said step S7

Wherein B is a consistent flow deviation value;

Q_aan average value of all Q values in the step S2 for each check valve at each preset pressure value P;

Q_bq in said step S2 for all said check valves at each of said preset pressure values P_aAverage of the values.

14. The method of testing a check valve of claim 12, further comprising a step S8 after the step S7, the step S8 comprising: if all the consistent flow deviation values B are within a preset consistent flow deviation value range, the plurality of one-way valves can be used for the same internal combustion engine; otherwise, the check valve and the new check valve having the consistency flow deviation value B within the preset consistency flow deviation value range are re-executed from the step S1 to the step S3, and from the step S6 to the step S8.

15. The method of testing a check valve of claim 14, wherein the stability flow deviation values a of the plurality of check valves are each within the predetermined stability flow deviation value range.