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

Abstract

The present invention provides a pressure test device, a detection device and a method for detecting a one-way valve. The pressure test device includes a shell, the shell includes a first cavity and a second cavity connected to the first cavity, the first cavity has a first opening for connecting to the internal channel of the first pipeline, the second cavity has a second opening for connecting to the internal channel of the second pipeline, the internal space of the first cavity is used to seal and connect the one-way valve, when the one-way valve is arranged in the first cavity, the first opening is connected to the inlet of the one-way valve, the second cavity is connected to the outlet of the one-way valve, and the one-way valve isolates the first opening and the second cavity. Therefore, the pressure test device detects the flowability and sealing of the one-way valve with high accuracy; the pressure test device simulates the state of the one-way valve installed in the pre-combustion chamber, so the result of detecting the performance of the one-way valve used in the pre-combustion chamber of the internal combustion engine by the pressure test device is more accurate.

Description

Technical Field

[0001] The present invention generally relates to the technical field of internal combustion engines, and more particularly to a pressure test device for detecting a one-way valve, a detection device, and a method for detecting a one-way valve. Background Art

[0002] Nowadays, due to the need for energy conservation and emission reduction of marine internal combustion engines, the application of natural gas as a fuel in the marine power industry has been vigorously promoted. Marine natural gas engines with a pre-combustion chamber structure can achieve high thermal efficiency and low emissions through lean combustion technology, so marine natural gas engines are widely used in the marine power industry.

[0003] A one-way valve is installed in the pre-combustion chamber of a marine natural gas engine. The performance (flowability and sealing) stability of a single one-way valve directly affects the air-fuel ratio in the pre-combustion chamber. And the performance consistency between the one-way valves of each cylinder of the engine (the performance parameters are within the preset range) affects the uniformity of combustion of each cylinder (the efficiency of combustion of each cylinder is within the preset range). In other words, the performance stability of a single one-way valve and the performance consistency between multiple one-way valves directly affect the overall performance of the engine.

[0004] The existing one-way valve includes a valve stem, a valve seat and a steel ball. The existing one-way valve is widely used in internal combustion engines due to its low cost. However, since the sealing form of the one-way valve is a rigid seal and the machining quality precision of the one-way valve is not high, the performance of the one-way valve is unstable when the one-way valve operates under different working conditions (the working pressure of the one-way valve is different), that is, the performance stability of a single one-way valve is poor, and the performance consistency between multiple one-way valves is poor.

[0005] In order to solve the above problems, the prior art adopts method 1 and method 2. Method 1 measures each one-way valve, and then compares the measurement results to select the appropriate one-way valve, but method 1 is inefficient and costly. Method 2 installs the one-way valve in the pre-combustion chamber body for testing, which can directly reflect the performance stability of a single one-way valve and the performance consistency between multiple one-way valves. However, method 2 is difficult to test and has poor operability.

[0006] Therefore, it is necessary to provide a pressure testing device, a detection device and a method for detecting a one-way valve to at least partially solve the above-mentioned problems. Summary of the invention

[0007] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the specific embodiments. The summary of the invention does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0008] In order to at least partially solve the above technical problems, according to one aspect of the present invention, a pressure test device for detecting a one-way valve is provided, the pressure test device comprising a shell, the shell comprising a first cavity and a second cavity connected to the first cavity, the first cavity having a first opening for connecting to an internal channel of a first pipe, the second cavity having a second opening for connecting to an internal channel of the second pipe, the internal space of the first cavity being used for sealingly connecting the one-way valve, when the one-way valve is arranged in the first cavity, the first opening is connected to an inlet of the one-way valve, the second cavity is connected to an outlet of the one-way valve, and the one-way valve isolates the first opening and the second cavity.

[0009] According to the pressure testing device for testing the one-way valve of the present invention, the pressure testing device has high accuracy in testing the flowability and sealing of the one-way valve; the internal structure of the pressure testing device is substantially the same as the structure in the pre-combustion chamber of an internal combustion engine where the one-way valve is arranged, and the pressure testing device simulates the state where the one-way valve is installed in the pre-combustion chamber, so the result of testing the performance of the one-way valve in the pre-combustion chamber of an internal combustion engine by the pressure testing device is more accurate.

[0010] Optionally, the shell is a columnar structure.

[0011] Optionally, a connecting hole is provided between the first cavity and the second cavity, the first cavity and the second cavity are connected through the connecting hole, and the inner diameter of the connecting hole is the same as the inner diameter of the outlet of the one-way valve.

[0012] Optionally, the first cavity and the second cavity are both circular holes, and the first cavity, the second cavity and the connecting hole are coaxially arranged.

[0013] Optionally, the position in the first cavity that is connected to the second cavity is a sealing surface, and the pressure testing device also includes a sealing gasket. When the one-way valve is installed in the first cavity, the outlet of the one-way valve presses the sealing gasket against the sealing surface to seal the gap between the sealing surface and the outlet of the one-way valve.

[0014] Optionally, the first cavity further has a third opening, and the third opening is 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.

[0015] The present invention also provides a detection device for detecting a one-way valve, the detection device comprising: a compressed gas tank; a pressure gauge, the pressure gauge being connected to the gas tank outlet of the compressed gas tank; a flow meter; and the aforementioned pressure test device, wherein one of the first opening and the second opening of the pressure test device is connected to the inlet of the flow meter, and the other is connected to the gas tank outlet.

[0016] According to the detection device for detecting a one-way valve of the present invention, the detection device for detecting a one-way valve includes a pressure test device. The pressure test device detects the flowability and sealing properties of the one-way valve with high accuracy. The internal structure of the pressure test device is substantially the same as the structure of a pre-combustion chamber of an internal combustion engine in which a one-way valve is arranged. The pressure test device simulates the state of the one-way valve being installed in the pre-combustion chamber. Therefore, the result of detecting the performance of the one-way valve of the pre-combustion chamber of an internal combustion engine by the detection device is more accurate.

[0017] Optionally, the detection device further includes: a first pipe joint connecting the first opening and the internal channel of the first pipe; and a second pipe joint connecting the second opening and the internal channel of the second pipe.

[0018] The present invention also provides a method for detecting a one-way valve by using the aforementioned detection device for detecting a one-way valve, the method comprising: step S1, sealing and connecting the one-way valve to be detected to the first cavity; step S2, passing a gas of a preset pressure value P for a preset time T from a compressed gas tank to a pressure test device, reading and recording a plurality of Q values ​​of a flow meter, and determining an average value Qa of a plurality of Q values ​​according to the plurality of Q values, wherein the Q value is the reading of the flow meter; step S3, repeating step S2 multiple times, wherein the preset pressure value P in each step S2 is different, and the preset time T of each step S2 is the same; step S4, according to the plurality of Q values ​​and Q values ​​in each step S2, a , determine the stability flow deviation value A for each Q value in each step S2.

[0019] According to the method for detecting a one-way valve of the present invention, the one-way valve is detected by the aforementioned detection device for detecting the one-way valve, and the detection device for detecting the one-way valve includes a pressure testing device. The pressure testing device has high accuracy in detecting the fluidity and sealing of the one-way valve. The internal structure of the pressure testing device is substantially the same as the structure of a pre-combustion chamber of an internal combustion engine in which a one-way valve is arranged. The pressure testing device simulates the state of the one-way valve being installed in the pre-combustion chamber. Therefore, the result of detecting the performance of the one-way valve of the pre-combustion chamber of an internal combustion engine by the detection device is more accurate.

[0020] Optionally, in step S4

[0021]

[0022] Among them, A is the stability flow deviation value;

[0023] Q a is the average value of all Q values ​​in each step S2;

[0024] Q i is the Q value in each step S2.

[0025] Optionally, the method further comprises step S5 after step S4, and step S5 comprises:

[0026] If all stability flow deviation values ​​A are within the preset stability flow deviation value range, it is determined that the one-way valve can be used in the internal combustion engine, otherwise the one-way valve cannot be used in the internal combustion engine.

[0027] Optionally, the method is used to detect multiple one-way valves. Correspondingly, the method further includes after step S3:

[0028] Step S6, according to the Q of each one-way valve at each preset pressure value P a , determine the Q of all non-return valves at each preset pressure value P a The average value Q b ;

[0029] Step S7, according to the Q of each one-way valve at each preset pressure value P a , and Q corresponding to each preset pressure value P b , determine the consistent flow deviation value B of each one-way valve at each preset pressure value P.

[0030] Optionally, in step S7

[0031]

[0032] Among them, B is the consistency flow deviation value;

[0033] Q a is the average value of all Q values ​​of each one-way valve in step S2 at each preset pressure value P;

[0034] Q b is the Q of all one-way valves in step S2 at each preset pressure value P. a The average of the values.

[0035] Optionally, the method further includes step S8 after step S7, and step S8 includes: if all consistency flow deviation values ​​B are within a preset consistency flow deviation value range, multiple one-way valves can be used for the same internal combustion engine; otherwise, the one-way valve with a consistency flow deviation value B within the preset consistency flow deviation value range and the new one-way valve re-execute steps S1 to S3 and steps S6 to S8.

[0036] Optionally, the stability flow deviation values ​​A of the multiple one-way valves are all within a preset stability flow deviation value range. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the advantages of the present invention more easily understood, the present invention briefly described above will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the present invention and therefore should not be considered as limiting the scope of protection thereof, and the present invention is described and explained with additional characteristics and details through the accompanying drawings.

[0038] Figure 1 is a cross-sectional schematic diagram of a pressure test device according to a first preferred embodiment of the present invention;

[0039] Figure 2 for Figure 1 A right side schematic diagram of

[0040] Figure 3 is a schematic diagram of a detection device according to a first preferred embodiment of the present invention; and

[0041] Figure 4 It is a schematic diagram of a detection device according to a second preferred embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 100: Pressure test device 110: Shell

[0044] 111: first cavity 111a: third opening

[0045] 111b: first opening 112: second cavity

[0046] 112a: second opening 113: communication hole

[0047] 120: Sealing gasket 130: Compressed gas tank

[0048] 140: Pressure gauge 150: Flow meter

[0049] 160: One-way valve

[0050] 200: pressure test device 211b: first opening

[0051] 212a: Second opening 230: Compressed gas tank

[0052] 240: Pressure gauge 250: Flow meter

[0053] 260: One-way valve DETAILED DESCRIPTION

[0054] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present invention, some technical features well known in the art are not described.

[0055] In order to fully understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0056] Implementation Method 1

[0057] The present invention provides a detection device for detecting a one-way valve. The detection device of this embodiment is used to detect the flowability and airtightness of the one-way valve 160 of the pre-combustion chamber of an internal combustion engine. It is understood that those skilled in the art can use the detection device of this embodiment to detect other one-way valves 160.

[0058] like Figures 1 to 3 As shown, the detection device of this embodiment includes a pressure test device 100 for detecting a one-way valve.

[0059] like Figure 1 and Figure 2 As shown, the pressure test device 100 of this embodiment includes a housing 110. Preferably, the housing 110 is a columnar structure. The housing 110 includes a first cavity 111. The first cavity 111 is used to accommodate a one-way valve 160. The one-way valve 160 can be disposed in its entirety in the first cavity 111. In this case, in the length direction ( Figure 1 In the left-right direction), the length of the first cavity 111 is greater than or equal to the length of the one-way valve 160. The one-way valve 160 may also be only partially disposed in the first cavity 111. In this embodiment, the one-way valve 160 is entirely disposed in the first cavity 111.

[0060] Preferably, the first cavity 111 has a third opening 111a, and the third opening 111a is used to set the one-way valve 160 in the first cavity 111. Specifically, the one-way valve 160 is provided with an external thread. The third opening 111a is provided with an internal thread corresponding to the external thread of the one-way valve 160. In this way, the one-way valve 160 is extended into the first cavity 111 through the third opening 111a, and then the one-way valve 160 and the third opening 111a are connected by threads, so that the one-way valve 160 can be fixedly connected in the first cavity 111. Therefore, the operation of installing the one-way valve 160 is simple.

[0061] In this embodiment, the one-way valve 160 and the first cavity 111 are sealed and connected, so that the gas in the first cavity 111 can be prevented from leaking to the outside of the pressure test device 100 through the connection between the pressure test device 100 and the one-way valve 160. Specifically, the pressure test device 100 for detecting the one-way valve 160 also includes a first sealing ring, which is arranged between the first opening 111b and the third opening 111a. In this way, when the one-way valve 160 and the third opening 111a are threadedly connected, the first sealing ring is located in the gap between the inner wall surface of the first cavity 111 and the outer wall surface of the one-way valve 160 to seal the gap between the inner wall surface of the first cavity 111 and the outer wall surface of the one-way valve 160, thereby preventing the gas in the first cavity 111 from leaking to the outside of the pressure test device 100 from the third opening 111a of the pressure test device 100. The first opening 111b will be described later.

[0062] In this embodiment, if Figure 1 As shown, the first cavity 111 has a first opening 111b, and the first opening 111b is arranged on the side wall of the columnar structure. Figure 1 In the left-right direction, the first opening 111b is located on the right side of the third opening 111a. The dimension between the center of the first opening 111b and the right end of the internal thread is substantially equal to the dimension between the air inlet of the one-way valve 160 and the end of the external thread facing the air inlet of the one-way valve 160. Thus, when the one-way valve 160 is threadedly connected to the third opening 111a, the inlet of the one-way valve 160 is connected to the first opening 111b.

[0063] In this embodiment, the first opening 111b is used to connect the internal channel of the first pipeline. Specifically, the detection device includes a pipe joint for connecting the pipeline and a pipe joint sealing gasket made of an elastic material (such as rubber), the pipe joint sealing gasket is a hollow gasket, the pipe joint includes a first pipe joint and a second pipe joint, and the pipe joint sealing gasket includes a first pipe joint sealing gasket and a second pipe joint sealing gasket. The first opening 111b is connected to the first pipeline through the first pipe joint. At this time, the internal channel of the first pipeline is connected to the inlet of the one-way valve 160.

[0064] 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 and the first opening 111b are threadedly connected. Thus, it is convenient to install the first pipe to the first opening 111b. In this embodiment, the first pipe joint sealing gasket is arranged between the first pipe joint and the first opening 111b. When the first pipe joint and the first opening 111b are threadedly connected, the first pipe joint presses the first pipe joint sealing gasket onto the first opening 111b, so that the first pipe joint sealing gasket seals the gap between the first pipe joint and the first opening 111b, and prevents the gas in the first cavity 111 from leaking from the connection between the first pipe joint and the first opening 111b to the outside of the pressure test device 100.

[0065] In this embodiment, the housing 110 further includes a second cavity 112 that is in communication with the first cavity 111. When the one-way valve 160 is disposed in the first cavity 111 by, for example, being threadedly connected to the third opening 111a, the one-way valve 160 isolates the first opening 111b from the second cavity 112. In this way, when the one-way valve 160 is disposed in the first cavity 111, it is possible to prevent the gas in the second cavity 112 from flowing from the gap between the outer wall of the one-way valve 160 and the inner wall of the first cavity 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 of the one-way valve 160 and the inner wall of the first cavity 111 to the second cavity 112.

[0066] Specifically, the position in the first cavity 111 that is connected to the second cavity 112 is a sealing surface, and the sealing surface is a plane. The pressure test device 100 also includes a sealing gasket 120, which is a hollow ring. The end surface where the outlet of the one-way valve 160 is located is a plane. When the one-way valve 160 is threadedly connected to the third opening 111a, the end surface where the outlet of the one-way valve 160 is located presses the sealing gasket 120 against the sealing surface, so that the sealing gasket 120 is located between the end surface where the outlet of the one-way valve 160 is located and the sealing surface. On the basis of ensuring that the outlet of the one-way valve 160 is connected to the second cavity 112, the sealing gasket 120 seals the gap between the end surface where the outlet of the one-way valve 160 is located and the sealing surface. The gas in the second cavity 112 is prevented from flowing to the first opening 111b from the gap between the outer wall of the one-way valve 160 and the inner wall of the first cavity 111, or the gas at the first opening 111b is prevented from flowing to the second cavity 112 from the gap between the outer wall of the one-way valve 160 and the inner wall of the first cavity 111. Preferably, the sealing gasket 120 is made of copper. The sealing gasket 120 is processed by annealing process, and the thickness of the sealing gasket 120 is 2 mm.

[0067] It can be understood that in order to make the one-way valve 160 isolate the first opening 111b from the second cavity 112, it is prevented that the gas in the second cavity 112 flows from the gap between the outer wall of the one-way valve 160 and the inner wall of the first cavity 111 to the first opening 111b, or it is prevented that the gas at the first opening 111b flows from the gap between the outer wall of the one-way valve 160 and the inner wall of the first cavity 111 to the second cavity 112. Those skilled in the art may also make other arrangements. For example, a second sealing ring is arranged in the first cavity 111, so that when the one-way valve 160 and the third opening 111a are threadedly connected, 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 the outer wall surface of the end where the outlet of the one-way valve 160 is located and the inner wall surface of the first cavity 111, so as to seal the gap between the outer wall surface of the end where the outlet of the one-way valve 160 is located and the inner wall surface of the first cavity 111, so that the one-way valve 160 isolates the first opening 111b from the second cavity 112.

[0068] In this embodiment, the second cavity 112 has a second opening 112a. The second opening 112a is used to communicate with the inner channel of the second pipe. Specifically, the second opening 112a is connected to the second pipe through a second pipe joint. At this time, the inner channel of the second pipe communicates with the second cavity 112.

[0069] Preferably, the second opening 112a is provided with an internal thread corresponding to the external thread of the pipe joint, and the second pipe joint is threadedly connected to the second opening 112a. Thus, it is convenient to install the second pipe to the second opening 112a. In this embodiment, the second pipe joint sealing gasket is arranged between the second pipe joint and the second opening 112a. When the second pipe joint and the second opening 112a are threadedly connected, the second pipe joint presses the second pipe joint sealing gasket onto the second opening 112a, so that the second pipe joint sealing gasket seals the gap between the second pipe joint and the second opening 112a, and prevents the gas in the second cavity 112 from leaking from the connection between the second pipe joint and the second opening 112a to the outside of the pressure test device 100.

[0070] In this embodiment, when the one-way valve 160 is threadedly connected to the third opening 111a, the second cavity 112 is connected to the outlet of the one-way valve 160. In this way, the flowability of the one-way valve 160 can be detected by filling the inlet of the one-way valve 160 with gas through the first pipe connected to the first opening 111b, and then detecting the flow rate of the gas in the second pipe connected to the second opening 112a. The sealing of the one-way valve 160 can be detected by filling the outlet of the one-way valve 160 with gas through the second pipe connected to the second opening 112a, and then detecting the gas flow rate in the first pipe connected to the first opening 111b. Since the one-way valve 160 and the pressure test device 100 are sealed and connected, and the one-way valve 160 isolates the first opening 111b and the second cavity 112, when the one-way valve 160 is installed in the pressure test device 100, the pressure test device 100 has good sealing and small gas leakage. The pressure test device 100 of this embodiment detects the flowability and sealing of the one-way valve 160 with high accuracy.

[0071] Preferably, a connecting hole 113 is provided between the first cavity 111 and the second cavity 112. The first cavity 111 and the second cavity 112 are connected through the connecting hole 113, and the inner diameter of the connecting hole 113 is the same as the inner diameter of the outlet of the one-way valve 160. Therefore, the internal structure of the pressure test device 100 is substantially the same as the structure in the pre-combustion chamber of the internal combustion engine where the one-way valve 160 is provided. The pressure test device 100 can simulate the state where the one-way valve 160 is installed in the pre-combustion chamber, so the result of detecting the one-way valve 160 used in the pre-combustion chamber of the internal combustion engine by the pressure test device 100 of this embodiment is more accurate.

[0072] Further preferably, the first cavity 111 and the second cavity 112 are both circular holes. The first cavity 111, the second cavity 112 and the connecting hole 113 are coaxially arranged. Thus, the first cavity 111, the second cavity 112 and the connecting hole 113 are conveniently processed.

[0073] Preferably, the housing 110 is made of 45# steel. The housing 110 is integrally formed. The internal shape of the first cavity 111 corresponds to the external shape of the one-way valve 160, so that the one-way valve 160 can be disposed in the first cavity.

[0074] The pressure test device 100 of this embodiment has a simple structure, a small size, a light weight, is easy to process, and has a low cost. At the same time, the pressure test device 100 has a high efficiency in detecting the one-way valve 160, and when the pressure test device 100 is used to detect the one-way valve 160, the pressure test device 100 does not leak, does not generate interference factors, and has a high detection accuracy.

[0075] The detection device of this 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 provide gas at a preset pressure. The inlet of the pressure gauge 140 is connected to the gas tank outlet of the compressed gas tank 130 to detect the gas pressure of the gas tank outlet of the compressed gas tank 130 in real time.

[0076] The compressed gas tank 130 and the pressure gauge 140 of the detection device of this embodiment are connected to the pressure test device 100 through a high-pressure pipeline. The pressure test device 100 and the flow meter 150 are connected through a high-pressure pipeline.

[0077] In this embodiment, if Figure 3 As shown, the second opening 112a of the pressure test device 100 can be connected to the inlet of the flow meter 150 to measure the gas flow at the second opening 112a in real time. At this time, the first opening 111b is connected to the gas tank outlet. In this way, the detection device is used to detect the fluidity of the one-way valve 160. Specifically, the inlet of the flow meter 150 is connected to the second opening 112a through the internal channel of the second pipeline. The gas tank outlet of the compressed gas tank 130 is connected to the first opening 111b through the internal channel of the first pipeline. In this way, the compressed gas tank 130 provides gas of a preset pressure, and the gas of the preset pressure enters the one-way valve 160 through the outlet of the compressed gas tank 130, the first pipeline, the first opening 111b, and the inlet of the one-way valve 160 in sequence, and then enters the internal channel of the second pipeline from the outlet of the one-way valve 160 through the second cavity 112. The flow meter 150 detects the flow of the gas in the second pipeline.

[0078] Preferably, the detection device for the one-way valve of this embodiment further comprises an experimental platform, and the pressure test device 100 is fixedly arranged on the experimental platform, thereby facilitating the operation of connecting the one-way valve 160 to the first cavity 111 .

[0079] The present invention also provides a first method for detecting the one-way valve 160. The first method of this embodiment is used to detect the stability of the flowability of a single one-way valve. The first method detects the stability of the flowability of the one-way valve 160 by the aforementioned detection device. Specifically, the detection device of the first method is as follows: Figure 3 As shown, the first method includes:

[0080] Step S1, sealingly connecting the one-way valve 160 to be tested into the first cavity 111;

[0081] Step S2: The compressed gas tank 130 passes gas of a preset pressure value P for a preset time T into the pressure test device 100, reads and records multiple Q values ​​(flow meter readings) of the flow meter 150, and determines the average value Q of the multiple Q values ​​according to the multiple Q values. a .

[0082] Specifically, turn on the compressed air switch of the compressed gas tank 130, and adjust the pressure to 18 bar (this embodiment is explained by taking the flowability of the one-way valve 160 when the gas pressure is 18 bar, 23 bar and 28 bar as an example, and readings Q of three flow meters 150 are read for each gas pressure). At this time, the pressure of the output gas of the compressed gas tank 130 is 18 bar. After the compressed gas tank 130 continuously outputs gas at a pressure of 18 bar for 1 minute (at this time, the pressure of the gas output by the compressed gas tank 130 is stable), read and record the reading of the pressure gauge 140 and the reading Q of the flow meter 150. Among them, read and record three Q values. The three Q values ​​are QI1, QI2 and QI3. Then determine the average value QI of QI1, QI2 and QI3. a .

[0083] Step S3, repeating step S2 multiple times, wherein the preset pressure value P in step S2 is different each time, and the preset time duration T of step S2 is the same each time;

[0084] Specifically, the pressure is adjusted to 23 bar, and the compressed gas tank 130 continuously outputs gas at a pressure of 23 bar for 1 minute, and then the reading of the pressure gauge 140 and the reading Q of the flow meter 150 are read and recorded. Among them, three Q values ​​are read and recorded. The three Q values ​​are QII1, QII2 and QII3. Then the average value QII1, QII2 and QII3 is determined. a .

[0085] Adjust the pressure to 28 bar, and make the compressed gas tank 130 continuously output gas at a pressure of 28 bar for 1 minute, then read and record the reading of the pressure gauge 140 and the reading Q of the flow meter 150. Among them, read and record three Q values. The three Q values ​​are QIII1, QIII2 and QIII3. Then determine the average value QIII of QIII1, QIII2 and QIII3 a .

[0086] Step S4: Based on the Q value and Q in each step S2 a , determine the stability flow deviation value A for each Q value in each step S2.

[0087] According to the Q value and Q a , determine the stability flow deviation value A for each Q value of this gear.

[0088] Specifically, for the gear with a pressure of 18 bar, according to QI1 and QI a , determine the stability flow deviation value AI1 of QI1. According to QI2 and QI a , determine the stability flow deviation value AI2 of QI2. According to QI3 and QI a, determine the stability flow deviation value AI3 of QI3. Record AI1, AI2 and AI3.

[0089] For the gear with a pressure of 23 bar, according to QII1 and QII a , determine the stability flow deviation value AII1 of QII1. a , determine the stability flow deviation value AII2 of QII2. According to QII3 and QII a , determine the stability flow deviation value AII3 of QII3. Record AII1, AII2 and AII3.

[0090] For the 28 bar pressure gear, according to QII1 and QIII a , determine the stability flow deviation value AIII1 of QIII1. According to QIII2 and QIII a , determine the stability flow deviation value AIII2 of QIII2. According to QIII3 and QIII a , determine the stability flow deviation value AIII3 of QIII3. Record AIII1, AIII2 and AIII3.

[0091] It should be noted that, in this embodiment, the preset pressures of multiple steps S2 are different, so that the performance state (stability flow deviation value) of the one-way valve under different working conditions of the internal combustion engine can be simulated. For example, the output pressure of the compressed gas tank 130 is 18 bar, which simulates the performance state of the one-way valve 160 under the low working condition of the internal combustion engine; the output pressure of the compressed gas tank 130 is 23 bar, which simulates the performance state of the one-way valve 160 under the intermediate working condition of the internal combustion engine; the output pressure of the compressed gas tank 130 is 28 bar, which simulates the performance state of the one-way valve 160 under the high working condition of the internal combustion engine. The low working condition, intermediate working condition and high working condition of the internal combustion engine in this embodiment can be the low working condition, intermediate working condition and high working condition under the propulsion characteristics of the internal combustion engine for ships.

[0092] After step S4, the first method further comprises step S5 of judging the flowability of the one-way valve 160. Step S5 comprises determining that the one-way valve can be used in the internal combustion engine if all stability flow deviation values ​​A are within the preset stability flow deviation value range, otherwise the one-way valve cannot be used in the internal combustion engine.

[0093] Specifically, the preset stability flow deviation value range can be ±10%. If each stability flow deviation value A of the one-way valve 160 at each pressure level (each preset pressure value P) is within the range of ±10%, that is, the absolute value of all stability flow deviation values ​​A (each of AI1, AI2, AI3, AII1, AII2, AII3, AIII1, AIII2 and AIII3) is less than or equal to 10%, then the one-way valve 160 is qualified and can be used in an internal combustion engine. If the absolute value of any stability flow deviation value A of the one-way valve 160 at any pressure level is greater than 10%, that is, the absolute value of any one of all stability flow deviation values ​​A (any one of AI1, AI2, AI3, AII1, AII2, AII3, AIII1, AIII2 and AIII3) is greater than 10%, then the one-way valve 160 is unqualified and cannot be used in an internal combustion engine. At this time, the internal structure of the one-way valve 160 needs to be adjusted, mainly adjusting the roughness of the steel ball and the taper angle at the end of the valve stem of the one-way valve 160. After the one-way valve 160 is adjusted, steps S1 to S4 are repeated again. If the absolute value of any one of the stability flow deviation values ​​A is still greater than 10%, it is considered that the one-way valve 160 does not meet the requirements and cannot be used in the internal combustion engine.

[0094] According to the method for detecting the flowability of the one-way valve 160, the flowability of the one-way valve 160 is detected by the aforementioned detection device for the one-way valve, and the detection accuracy is high.

[0095] Preferably, the flow deviation value A can be determined by the following formula.

[0096]

[0097] Among them, A is the stability flow deviation value;

[0098] Q a is the average value of all Q values ​​in each step S2;

[0099] Q i is the Q value in each step S2.

[0100] Thereby, the detection accuracy is further improved.

[0101] The present invention also provides a second method for detecting a one-way valve 160. The second method detects the consistency of flowability between multiple one-way valves 160 through the aforementioned detection device for one-way valves. The detection device of the second method is the same as the detection device of the first method. The stability flow deviation values ​​A of the multiple one-way valves 160 detected by the second method are all within the preset stability flow deviation value range. In other words, multiple one-way valves 160 with qualified stability flow deviation values ​​A are selected from the first method, and then the consistency of flowability of the selected qualified multiple one-way valves 160 is checked by the second method. The difference between the second method and the first method is that:

[0102] The first method is used to detect the stability flow deviation value A of the circulation of a single one-way valve 160. The second method is used to detect the consistency flow deviation value B of the circulation between multiple one-way valves 160. Specifically, the second method detects the consistency of circulation between multiple one-way valves 160 by detecting multiple one-way valves 160 (this embodiment is described by taking the detection of the consistency of circulation of three one-way valves 160 as an example). Steps S1, S2 and S3 of the second method for detecting each one-way valve 160 are the same as steps S1, S2 and S3 of the first method, and are not repeated here.

[0103] The second method is to complete the step S3 of detecting each one-way valve 160 (at this time, the average value of all Q values ​​of each one-way valve 160 at each pressure level is determined. For example, for the gear with a pressure of 18 bar, the average value of the first one-way valve 160 is Q1I a , the second one-way valve 160 average value is Q2I a The average value of the third check valve 160 is Q3I a ; For the gear with a pressure of 23 bar, the average value of the first non-return valve 160 is Q1II a , the second one-way valve 160 average value is Q2II a The average value of the third check valve 160 is Q3II a ; For the gear with a pressure of 28 bar, the average value of the first non-return valve 160 is Q1III a 、The average value of the second one-way valve 160 is Q2III a The average value of the third check valve 160 is Q3III a ), also includes step S6 and step S7.

[0104] Step S6, according to the Q of each one-way valve 160 at each preset pressure value P a , determine the Q of all one-way valves 160 at each preset pressure value P a The average value Q b ;

[0105] Specifically, for the gear with a pressure of 18 bar, according to Q1I a 、Q2I a With Q3I a Determine QI b ; For the gear with a pressure of 23 bar, according to Q1II a 、Q2II a With Q3II a Determine QII b ; For the gear with a pressure of 28 bar, according to Q1III a 、Q2III a With Q3III a Determine QIII b .

[0106] Step S7, according to the Q of each one-way valve 160 at each preset pressure value P a , and Q corresponding to each preset pressure value P b , determine the consistent flow deviation B of each one-way valve 160 at each preset pressure value P.

[0107] Specifically, for the gear with a pressure of 18 bar, according to Q1I a and QI b Determine and record the consistency flow deviation value B1I of the first one-way valve when the working pressure (compressed gas tank 130) is 18 bar; according to Q2I a and QI b Determine and record the consistent flow deviation value B2I of the second check valve at an operating pressure of 18 bar; according to Q3I a and QI b Determine and record the consistency flow deviation value B3I of the third one-way valve at an operating pressure of 18 bar.

[0108] For the gear with a pressure of 23 bar, according to Q1II a and QII b Determine and record the consistent flow deviation value B1II of the first check valve at an operating pressure of 23 bar; according to Q2II a and QII b Determine and record the consistent flow deviation value B2II of the second check valve at an operating pressure of 23 bar; according to Q3II a and QII b Determine and record the consistency flow deviation value B3II of the third check valve at an operating pressure of 23 bar.

[0109] For the gear with a pressure of 28 bar, according to Q1III a and QIII bDetermine and record the consistent flow deviation value B1III of the first check valve at an operating pressure of 28 bar; according to Q2III a and QIII b Determine and record the consistency flow deviation value B2III of the second check valve at an operating pressure of 28 bar; according to Q3III a and QIII b Determine and record the consistency flow deviation value B3III of the third check valve at an operating pressure of 28 bar.

[0110] After step S7, the second method further includes step S8. Step S8 includes if all the consistent flow deviation values ​​B are within the preset consistent flow deviation value range, then multiple one-way valves can be used for the same internal combustion engine; otherwise, the one-way valves with the consistent flow deviation value B within the preset consistent flow deviation value range and the new one-way valve re-execute steps S1 to S3 and steps S6 to S8.

[0111] Specifically, the preset consistency flow deviation value range can be ±10%. If each consistency flow deviation B under each pressure level is within the range of ±10%, that is, the absolute value of all consistency flow deviations B (each of B1I, B2I, B3I, B1II, B2II, B3II, B1III, B2III and B3III) is less than or equal to 10%, it means that all the one-way valves 160 are qualified and can be used in each pre-combustion chamber of the same internal combustion engine.

[0112] If the absolute value of the consistent flow deviation B of any one of the one-way valves 160 at any pressure level is greater than 10%, that is, the absolute value of any one of the consistent flow deviations B (any one of B1I, B2I, B3I, B1II, B2II, B3II, B1III, B2III and B3III) is greater than 10%, it means that there is an unqualified one-way valve 160 (a one-way valve 160 with an absolute value of the consistent flow deviation B at any pressure level greater than 10%, for example, the third one-way valve is unqualified) among all the one-way valves 160. All the one-way valves 160 (the first one-way valve, the second one-way valve and the third one-way valve) cannot be used in each pre-combustion chamber of the same internal combustion engine. At this time, the unqualified one-way valve 160 (the third one-way valve) among all the one-way valves 160 can be removed, and a new one-way valve 160 (the fourth one-way valve) and qualified one-way valves 160 (the first one-way valve and the second one-way valve) are selected to form a new one-way valve group (the first one-way valve, the second one-way valve and the fourth one-way valve), and steps S1 to S3 and S6 to S8 are re-executed to determine the consistent flow deviation B of the new one-way valve group until all the one-way valves 160 of the new one-way valve group (the first one-way valve, the second one-way valve and the fourth one-way valve) are qualified. Thus, it can be determined that all the one-way valves used in the same internal combustion engine are qualified, so as to avoid uneven ignition of each cylinder of the internal combustion engine, thereby increasing the probability of engine misfire or knock.

[0113] According to the method for detecting the consistency of the flowability of the one-way valve 160, the consistency of the flowability of the one-way valve 160 is detected by the aforementioned detection device for the one-way valve, and the detection accuracy is high.

[0114] Preferably, the flow deviation value B can be determined by the following formula.

[0115]

[0116] Among them, B is the consistency flow deviation value;

[0117] Q a is the average value of all Q values ​​of each one-way valve 160 in step S2 at each preset pressure value P;

[0118] Q b is the Q of all one-way valves 160 in step S2 at each preset pressure value P. a The average of the values.

[0119] Thereby, the detection accuracy is further improved.

[0120] Implementation Method 2

[0121] The differences between the second implementation mode and the first implementation mode are as follows:

[0122] In this embodiment, if Figure 4 As shown, the first opening 211b of the pressure test device 200 is connected to the inlet of the flow meter 250 to measure the gas flow at the first opening 211b in real time. At this time, the second opening 212a is connected to the outlet of the gas tank. In this way, the detection device is used to detect the sealing of the one-way valve 260. Specifically, the inlet of the flow meter 250 is connected to the first opening 211b through the internal channel of the first pipeline. The gas tank outlet of the compressed gas tank 230 is connected to the second opening 212a through the internal channel of the second pipeline. In this way, the compressed gas tank 230 provides gas of preset pressure, and the gas of preset pressure enters the one-way valve 260 through the outlet of the compressed gas tank 230, the internal channel of the second pipeline, the second opening 212a, the second cavity, and the outlet of the one-way valve 260 in sequence, and then enters the internal channel of the first pipeline from the inlet of the one-way valve 260. The flow meter 250 detects the flow of gas in the first pipeline. The pressure gauge 240 in this embodiment can be the same as the pressure gauge 140 in the embodiment.

[0123] The present invention also provides a third method for detecting the one-way valve 260. The third method is a method for detecting the stability of the sealing of the one-way valve 260 by using the detection device for the one-way valve of the second embodiment. The inspection steps of the third method are the same as those of the first method. The steps for determining the sealing of the one-way valve 260 are also the same as the steps for determining the flowability of the one-way valve 260 of the first method. The only difference between the third method and the first method is that the installation method of the compressed gas tank 230 and the flow meter 250 is different. The detection device of the first method is as follows: Figure 3 As shown, the detection device of the third method is as follows Figure 4 shown.

[0124] According to the method for detecting the stability of the sealing performance of the one-way valve 260, the stability of the sealing performance of the one-way valve 260 is detected by the detection device for the one-way valve of the second embodiment, and the detection accuracy is high.

[0125] The present invention also provides a fourth method for detecting the one-way valve 260. The fourth method is a method for detecting the consistency of the sealing between multiple one-way valves 260 by using the detection device for one-way valves of the second embodiment. The inspection steps of the fourth method are the same as those of the second method. The steps for judging the consistency of the sealing of the one-way valve 260 are also the same as the steps for judging the consistency of the flowability of the one-way valve 260 of the second method. The difference between the fourth method and the second method is that the installation methods of the compressed gas tank 230 and the flow meter 250 are different, and the detection device of the second method is as follows: Figure 3 As shown, the detection device of the fourth method is as follows Figure 4 shown.

[0126] According to the method for detecting the consistency of the sealing properties between the plurality of one-way valves 260, the consistency of the sealing properties between the plurality of one-way valves 260 is detected by the detection device for one-way valves of the second embodiment, and the detection accuracy is high.

[0127] The first method, the second method, the third method and the fourth method of the present invention are simple to operate and have high testing accuracy, which greatly solves practical problems and reduces costs.

[0128] The internal combustion engine using the one-way valve determined by the first method, the second method, the third method and the fourth method of the present invention can ensure the overall performance requirements of the internal combustion engine.

[0129] In the present invention, multiple one-way valves that meet the requirements of flow consistency and sealing consistency can be selected according to the second method and the fourth method, thereby solving the problem of poor combustion consistency of each cylinder of the internal combustion engine.

[0130] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "component" and the like appearing herein may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" and the like appearing herein may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0131] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and illustration, and are not intended to limit the present invention to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention.

Claims

1. A pressure test device for detecting a one-way valve, characterized in that: The pressure testing device comprises: A housing, the housing comprising a first cavity and a second cavity communicating with the first cavity, the first cavity having a first opening for communicating with an internal passage of a first pipe, the second cavity having a second opening for communicating with an internal passage of a second pipe, the internal space of the first cavity being used for sealingly connecting a one-way valve, when the one-way valve is disposed 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, the first cavity further having a third opening, the third opening being provided with an internal thread for connecting the one-way valve, a first sealing ring, the first sealing ring being arranged between the first opening and the third opening, and when the one-way valve and the third opening are threadedly connected, the first sealing ring is located in the gap between the inner wall surface of the first cavity and the outer wall surface of the one-way valve to seal the gap between the inner wall surface of the first cavity and the outer wall surface of the one-way valve; a second sealing ring, the second sealing ring being located in the first cavity, and when the one-way valve and the third opening are threadedly connected, the second sealing ring is located between the first opening of the first cavity and the second cavity, and the second sealing ring is located between the outer wall surface of one end where the outlet of the one-way valve is located and the inner wall surface of the first cavity, so as to seal the gap between the outer wall surface of one end where the outlet of the one-way valve is located and the inner wall surface of the first cavity; or The position in the first cavity that is connected to the second cavity is a sealing surface; the pressure test device includes a sealing gasket, and when the one-way valve is installed in the first cavity, the outlet of the one-way valve presses the sealing gasket against the sealing surface to seal the gap between the sealing surface and the outlet of the one-way valve.

2. The pressure test device according to claim 1, characterized in that: The shell is a columnar structure.

3. The pressure test device according to claim 1, characterized in that: A communicating hole is provided between the first cavity and the second cavity, the first cavity and the second cavity are communicated through the communicating hole, and the inner diameter of the communicating hole is the same as the inner diameter of the outlet of the one-way valve.

4. The pressure test device according to claim 3, characterized in that: The first cavity and the second cavity are both circular holes, and the first cavity, the second cavity and the communicating hole are coaxially arranged.

5. The pressure test device according to claim 1, characterized in that: The first opening is provided with an internal thread; and / or The second opening is provided with an internal thread.

6. A detection device for detecting a one-way valve, characterized in that: The detection device comprises: Compressed gas tanks; A pressure gauge, the pressure gauge being in communication with a gas tank outlet of the compressed gas tank; flow meter; and The pressure test device according to any one of claims 1 to 5, wherein one of the first opening and the second opening of the pressure test device is connected to the inlet of the flow meter, and the other is connected to the outlet of the gas tank.

7. The detection device according to claim 6, characterized in that: The detection device also includes: a first pipe joint connecting the first opening and an inner passage of the first pipe; and A second pipe joint is provided, wherein the second pipe joint communicates with the second opening and an inner passage of the second pipe.

8. A method for detecting a one-way valve by using the detection device for detecting a one-way valve according to claim 6 or 7, characterized in that: The method comprises: Step S1, sealingly connecting the one-way valve to be tested into the first cavity; Step S2: The compressed gas tank passes gas of a preset pressure value P for a preset time T into the pressure test device, reads and records multiple Q values ​​of the flow meter, and determines the average value Q of the multiple Q values ​​according to the multiple Q values. a , wherein the Q value is the reading of the flow meter; Step S3, repeating step S2 multiple times, each time the preset pressure value P in step S2 is different, and each time the preset time length T of step S2 is the same; Step S4: according to the multiple Q values ​​and the Q a , determine the stability flow deviation value A of each Q value in each step S2.

9. The method for detecting a one-way valve according to claim 8, characterized in that: In step S4 Among them, A is the stability flow deviation value; Q a is the average value of all Q values ​​in each step S2; Q i is the Q value in each step S2.

10. The method for detecting a one-way valve according to claim 8, characterized in that: 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 one-way valve can be used in the internal combustion engine, otherwise the one-way valve cannot be used in the internal combustion engine.

11. The method for detecting a one-way valve according to claim 10, characterized in that: The method is used to detect a plurality of one-way valves. Correspondingly, the method further comprises after step S3: Step S6, according to the Q of each one-way valve at each preset pressure value P a , determine the Q of all the one-way valves at each preset pressure value P a The average value Q b ; Step S7, according to the Q of each one-way valve at each preset pressure value P a , and the Q corresponding to each of the preset pressure values ​​P b , determine the consistent flow deviation value B of each one-way valve at each preset pressure value P.

12. The method for detecting a one-way valve according to claim 11, characterized in that: In step S7 Among them, B is the consistency flow deviation value; Q a is the average value of all Q values ​​of each one-way valve in step S2 at each preset pressure value P; Q b is the Q of all the one-way valves in step S2 at each preset pressure value P. a The average of the values.

13. The method for detecting a one-way valve according to claim 11, characterized in that: The method further includes step S8 after step S7, and step S8 includes: if all the consistency flow deviation values ​​B are within the preset consistency flow deviation value range, the multiple one-way valves can be used in the same internal combustion engine; otherwise, the one-way valve whose consistency flow deviation value B is within the preset consistency flow deviation value range and the new one-way valve re-execute steps S1 to S3 and steps S6 to S8.

14. The method for detecting a one-way valve according to claim 13, characterized in that: The stability flow deviation values ​​A of the multiple one-way valves are all within the preset stability flow deviation value range.

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