CN214471595U

CN214471595U - Air tightness detection device

Info

Publication number: CN214471595U
Application number: CN202120593720.9U
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuxi Lead Intelligent Equipment Co Ltd
Current assignee: Jiangsu hydrogen guide intelligent equipment Co.,Ltd.
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-10-22
Anticipated expiration: 2031-03-23

Abstract

The utility model relates to an air tightness check out test set, connect gas circuit and third including board, air feed mechanism, first connection gas circuit, second and connect the gas circuit. The gas supply mechanism is used for providing test gas and detecting the flow of the output test gas, the gas inlet end of the first connecting gas path is communicated with the gas supply mechanism, and the gas outlet end of the first connecting gas path is used for being communicated with a hydrogen cavity of the engine; the air inlet end of the second connecting air path is communicated with the air supply mechanism, and the air outlet end of the second connecting air path is communicated with the water cavity of the engine; the air inlet end of the third connecting air path is communicated with the air supply mechanism, the air outlet end of the third connecting air path is communicated with an air chamber of the engine, and the first connecting air path, the second connecting air path and the third connecting air path respectively comprise a conduction state for test air to flow and a stop state for blocking the test air to flow. This gas tightness check out test set can carry out the gas tightness to the hydrogen chamber of engine, water cavity and air chamber and detect, and compatibility preferred has reduced the engine cavity and has leaked the cost that detects certainly.

Description

Air tightness detection device

Technical Field

The utility model relates to an air tightness detects technical field, especially relates to an air tightness check out test set.

Background

The air tightness detection is an indispensable part in the assembly of a fuel cell engine system, and main detection items comprise self-leakage detection of a hydrogen cavity, a water cavity and an air cavity of the engine system and leakage detection between the hydrogen cavity and the water cavity and between the hydrogen cavity and the air cavity and between the water cavity and the air cavity.

The existing detection equipment for detecting the self leakage is usually used for single cavity detection, namely, each detection equipment can only be used for detecting a corresponding cavity, the compatibility is poor, and the cost of the self leakage detection of the engine cavity is high.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an air tightness detection device capable of detecting the self leakage of multiple cavities of the engine and reducing the detection cost, aiming at the problem that the existing detection device for the self leakage of the engine cavity has poor compatibility.

An airtightness detection apparatus comprising:

a machine platform;

the gas supply mechanism is arranged on the machine table and used for providing test gas and detecting the flow of the output test gas;

the gas inlet end of the first connecting gas circuit is communicated with the gas supply mechanism, and the gas outlet end of the first connecting gas circuit is communicated with a hydrogen cavity of the engine;

the air inlet end of the second connecting air path is communicated with the air supply mechanism, and the air outlet end of the second connecting air path is communicated with the water cavity of the engine; and

the air inlet end of the third connecting air path is communicated with the air supply mechanism, and the air outlet end of the third connecting air path is used for being communicated with the air cavity of the engine;

the first connecting air path, the second connecting air path and the third connecting air path all comprise a conduction state for the test gas to flow and a stop state for blocking the test gas to flow.

An operator respectively communicates the first connecting gas circuit, the second connecting gas circuit and the third connecting gas circuit with a hydrogen cavity, a water cavity and an air cavity of the engine, the gas supply mechanism can input test gas into the first connecting gas circuit, the second connecting gas circuit and the third connecting gas circuit, and then the test gas is respectively input into the hydrogen cavity, the water cavity and the air cavity by respectively controlling the first connecting gas circuit, the second connecting gas circuit and the third connecting gas circuit to be switched between a conduction state and a stop state.

Air feed mechanism earlier until the atmospheric pressure in hydrogen chamber, water cavity or the air cavity reaches preset pressure value to hydrogen chamber, water cavity or the air cavity, then continue to input test gas in order to guarantee that hydrogen chamber, water cavity or air cavity keep preset pressure value, and the accessible this moment acquires the gaseous flow of test of air feed mechanism input and directly judges whether the gas tightness of hydrogen chamber, water cavity or the air cavity of engine reaches the requirement. Through adopting foretell gas tightness check out test set, can carry out the gas tightness to the hydrogen chamber of engine, water cavity and air chamber and detect, compatibility preferred need not to set up different gas tightness check out test set to different cavitys, has reduced the engine cavity from the cost of leak testing.

In one embodiment, the gas supply mechanism comprises a gas source, a main pipeline, a first gas supply pipeline and a mass flow meter;

the gas source is used for providing the test gas, the gas inlet end of the main pipeline is communicated with the gas source, the gas inlet end of the first gas supply pipeline is communicated with the gas outlet end of the main pipeline, the gas outlet end of the first gas supply pipeline is simultaneously communicated with the gas inlet ends of the first connecting gas circuit, the second connecting gas circuit and the third connecting gas circuit, and the mass flow meter is arranged on the first gas supply pipeline and used for detecting the flow of the test gas in the first gas supply pipeline;

the first gas supply pipeline comprises a conducting state for flowing the test gas and a stopping state for blocking the test gas from flowing.

In one embodiment, the air supply mechanism includes at least two first air supply lines and at least two mass flowmeters, air inlet ends of all the first air supply lines are communicated with an air outlet end of the main line, an air outlet end of any one of the first air supply lines is simultaneously communicated with air inlet ends of the first connection air path, the second connection air path and the third connection air path, and each mass flowmeter is disposed on a corresponding one of the first air supply lines.

In one embodiment, the gas supply mechanism further comprises a pressure reducing valve, and the pressure reducing valve is arranged on the main pipeline.

In one embodiment, the air supply mechanism further comprises a second air supply pipeline, an air inlet end of the second air supply pipeline is communicated with an air outlet end of the main pipeline, and an air outlet end of the second air supply pipeline is simultaneously communicated with air inlet ends of the first connecting air path, the second connecting air path and the third connecting air path;

the second gas supply line includes a conduction state in which the test gas flows and a blocking state in which the test gas is blocked from flowing.

In one embodiment, the air supply mechanism further includes at least two first control valves, and the at least two first control valves are respectively disposed on the first air supply pipeline and the second air supply pipeline to respectively control on and off of the first air supply pipeline and the second air supply pipeline.

In one embodiment, the air tightness detecting device further includes three second control valves, and the three second control valves are respectively disposed on the first connecting air path, the second connecting air path, and the third connecting air path to respectively control on/off of the first connecting air path, the second connecting air path, and the third connecting air path.

In one embodiment, the air tightness detecting device further includes three pressure detectors, the three pressure detectors are respectively disposed on the first connecting air path, the second connecting air path and the third connecting air path, and are all located on one side of the second control valve away from the air supply mechanism, and the three pressure detectors are used for respectively detecting air pressures in the first connecting air path, the second connecting air path and the third connecting air path.

In one embodiment, the air tightness detecting device further includes an exhaust mechanism, the exhaust mechanism is simultaneously communicated with the first connecting air path, the second connecting air path and the third connecting air path, the communication positions of the exhaust mechanism and the first connecting air path, the second connecting air path and the third connecting air path are located between the second control valve and the pressure detector, and the exhaust mechanism is used for operatively communicating or separating the first connecting air path, the second connecting air path and the third connecting air path from the outside.

In one embodiment, the air tightness detecting device further includes three third control valves, which are respectively disposed on the first connecting air path, the second connecting air path and the third connecting air path, are located between the pressure detector and communication positions of the exhaust mechanism and the first connecting air path, the second connecting air path and the third connecting air path, and are used for respectively controlling on and off of the first connecting air path, the second connecting air path and the third connecting air path.

In one embodiment, the exhaust mechanism includes three exhaust branches, an exhaust trunk and an exhaust main valve, wherein the air inlet ends of the three exhaust branches are respectively communicated with the first connecting air passage, the second connecting air passage and the third connecting air passage, the air inlet end of the exhaust trunk is simultaneously communicated with the air outlet ends of the three exhaust branches, and the exhaust main valve is arranged on the exhaust trunk and used for controlling the on-off of the exhaust trunk.

In one embodiment, the exhaust mechanism further includes three fourth control valves, and each fourth control valve is disposed on a corresponding exhaust branch and is used for controlling on/off of the corresponding exhaust branch.

In one embodiment, the air tightness detection device further comprises a first quick coupling, a second quick coupling and a third quick coupling;

the first quick connector is communicated with the gas outlet end of the first connecting gas circuit and is used for being communicated with a hydrogen cavity of the engine;

the second quick connector is communicated with the air outlet end of the second connecting air path and is used for being communicated with a water cavity of the engine;

and the third quick connector is communicated with the air outlet end of the third connecting air path and is used for being communicated with the air cavity of the engine.

In one embodiment, the airtightness detection apparatus further includes a pipe coiling device disposed on the machine, and the first connection air path, the second connection air path, and the third connection air path are partially wound around the pipe coiling device.

An airtightness detection apparatus comprising:

a machine platform;

the gas supply mechanism is arranged on the machine table and used for supplying test gas;

one end of the first connecting gas path is connected with the gas supply mechanism, and the other end of the first connecting gas path is communicated with a hydrogen cavity of the engine;

one end of the second connecting air path is connected with the air supply mechanism, and the other end of the second connecting air path is communicated with a water cavity of the engine;

one end of the third connecting air path is connected with the air supply mechanism, and the other end of the third connecting air path is communicated with an air cavity of the engine; and

the three pressure detectors are respectively arranged on the first connecting gas path, the second connecting gas path and the third connecting gas path;

the first connecting gas path, the second connecting gas path and the third connecting gas path all comprise a conducting state for the test gas to flow and a stopping state for blocking the test gas to flow;

when the first connection air path, the second connection air path or the third connection air path is in the cut-off state, the corresponding pressure detector is used for detecting the air pressure of a hydrogen cavity of the engine, a water cavity of the engine or an air cavity of the engine.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an air-tightness detecting apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the airtightness detection apparatus shown in FIG. 1;

fig. 3 is a schematic cross-sectional view of another angle of the airtightness detection apparatus shown in fig. 1;

fig. 4 is a schematic sectional view of the airtightness detection apparatus shown in fig. 1 from yet another angle.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1 and 2, the air tightness detecting device 100 provided by the first embodiment of the present invention includes a machine table 10, an air supply mechanism 20, a first connecting air path 31, a second connecting air path 32 and a third connecting air path 33 for performing air tightness detection on a hydrogen chamber, a water chamber and an air chamber of an engine.

The gas supply mechanism 20 is disposed on the machine 10 and configured to provide a test gas and detect a flow rate of the output test gas.

The air inlet end of the first connecting air path 31 is communicated with the air supply mechanism 20, and the air outlet end of the first connecting air path 31 is used for being communicated with a hydrogen cavity of the engine; the air inlet end of the second connecting air path 32 is communicated with the air supply mechanism 20, and the air outlet end of the second connecting air path 32 is used for being communicated with a water cavity of the engine; the air inlet end of the third connecting air path 33 is communicated with the air supply mechanism 20, and the air outlet end of the third connecting air path 33 is used for being communicated with the air cavity of the engine.

The first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 all include a conducting state for the test gas to flow and a blocking state for blocking the test gas from flowing.

An operator respectively communicates the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 with a hydrogen cavity, a water cavity and an air cavity of the engine, the air supply mechanism 20 can input test gas into the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, and then the test gas is respectively input into the hydrogen cavity, the water cavity and the air cavity by respectively controlling the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 to be switched between a conduction state and a stop state.

Air feed mechanism 20 inputs test gas earlier in hydrogen chamber, water cavity or the air cavity until the atmospheric pressure in hydrogen chamber, water cavity or the air cavity reaches preset pressure value, then continues to input test gas in order to guarantee that hydrogen chamber, water cavity or air cavity keep preset pressure value, and the accessible obtains the gaseous flow of test of air feed mechanism 20 input this moment and directly judges whether the gas tightness of the hydrogen chamber of engine, water cavity or air cavity reaches the requirement. Through adopting foretell gas tightness check out test set, can carry out the gas tightness to the hydrogen chamber of engine, water cavity and air chamber and detect, compatibility preferred need not to set up different gas tightness check out test set to different cavitys, has reduced the engine cavity from the cost of leak testing.

Referring to fig. 3 and 4, in some embodiments, the machine 10 includes a housing 11, the housing 11 has a first inner cavity 111, a second inner cavity 112 and an opening communicating with the second inner cavity 112, the air supply mechanism 20 is disposed in the first inner cavity, a first connecting air path 31, a second connecting air path 32 and a third connecting air path 33 are partially disposed in the first inner cavity 111 to communicate with the air supply mechanism 20, and another portion of the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 extends into the second inner cavity 112 and can extend out of the opening to communicate with a hydrogen cavity, a water cavity and an air cavity of the engine respectively.

Adopt casing 11 and set up air feed mechanism 20 and first connecting gas circuit 31, second connecting gas circuit 32 and third connecting gas circuit 33 in casing 11 through the setting for whole integrated level is high, and occupation space is little.

In practice, the machine stand 10 further includes a front door connected to the opening of the cabinet 11 for operatively opening or closing the opening. It should be noted that the front door may be connected to the cabinet 11 by a hinge, or may be connected by another method, which is not limited herein.

In some embodiments, the machine 10 further includes a touch screen 12, the air tightness detection device further includes a controller, the controller and the touch screen 12 are both disposed on the machine 10, the controller is connected to the air supply mechanism 20, the touch screen 12 is connected to the controller, the touch screen 12 is used for displaying data such as the flow rate of the test gas and the air pressure in the cavity of the engine, and meanwhile, an operator can also control the device through the touch screen 12 and the controller.

In some embodiments, the machine table 10 further includes a plurality of universal wheels 13, and the universal wheels 13 are disposed at the bottom of the casing 11 for facilitating the movement of the casing 11.

In some embodiments, the air-tightness detecting apparatus further includes a first quick coupling 34, a second quick coupling 35, and a third quick coupling 36, the first quick coupling 34 is in communication with the air outlet end of the first connecting air path 31 and is configured to be in communication with a hydrogen cavity of the engine, the second quick coupling 35 is in communication with the air outlet end of the second connecting air path 32 and is configured to be in communication with a water cavity of the engine, and the third quick coupling 36 is in communication with the air outlet end of the third connecting air path 33 and is configured to be in communication with an air cavity of the engine. Through setting up quick-operation joint, can realize with the hydrogen chamber of engine, the water cavity and the quick-operation connection of air cavity, further improve the efficiency that the gas tightness detected.

In some embodiments, the air tightness detecting apparatus further includes a pipe coiling device 37, the pipe coiling device 37 is disposed on the machine table 10, and the first connecting air path 31, the second connecting air path 32, and the third connecting air path 33 are partially wound around the pipe coiling device 37 for convenient storage. That is, when the operator needs to perform the air tightness detection, the corresponding connection air passage is pulled out from the pipe coiling device 37, and then is communicated with the cavity corresponding to the engine, and when the connection air passage needs to be stored, the connection air passage is wound and stored on the pipe coiling device 37.

It should be noted that, for the first connection air path 31, the second connection air path 32, and the third connection air path 33, three pipe rolling devices 37 may be provided for storage, or one pipe rolling device 37 may be provided for storage, but the storage and use of the first connection air path 31, the second connection air path 32, and the third connection air path 33 are not affected by each other.

In some embodiments, the gas supply mechanism 20 includes a gas source 21, a main pipeline 22, a first gas supply pipeline 23 and a mass flow meter 24, the gas source 21 is configured to provide the test gas, a gas inlet end of the main pipeline 22 is communicated with the gas source 21, a gas inlet end of the first gas supply pipeline 23 is communicated with a gas outlet end of the main pipeline 22, a gas outlet end of the first gas supply pipeline 23 is simultaneously communicated with gas inlets of the first connection gas pipeline 31, the second connection gas pipeline 32 and the third connection gas pipeline 33, and the mass flow meter 24 is disposed on the first gas supply pipeline 23 and configured to detect a flow rate of the test gas in the first gas supply pipeline 23.

The first gas supply line 23 includes a conducting state for flowing the test gas and a blocking state for blocking the flow of the test gas.

In this way, the gas source 21 outputs the test gas, and the test gas is input into the first connection gas path 31, the second connection gas path 32 or the third connection gas path 33 along the main pipeline 22 and the first gas supply pipeline 23, and then enters the hydrogen cavity, the water cavity or the air cavity of the engine, so as to perform the airtightness detection on the hydrogen cavity, the water cavity or the air cavity of the engine.

Further, the air supply mechanism 20 further includes a second air supply pipeline 25, an air inlet end of the second air supply pipeline 25 is communicated with an air outlet end of the main pipeline 22, and an air outlet end of the second air supply pipeline 25 is simultaneously communicated with air inlet ends of the first connecting air channel 31, the second connecting air channel 32 and the third connecting air channel 33.

The second gas supply line 25 includes a conducting state for flowing the test gas and a blocking state for blocking the flow of the test gas.

It will be appreciated that the first gas supply line 23 is provided with a mass flow meter 24 for sensing the flow of gas through the first gas supply line 23, and that flow meters have a range, and that the flow in the first gas supply line 23 is typically small over the range of the flow meter, resulting in an initial lengthy period of time to input the test gas to the predetermined pressure value in the cavity of the engine.

Therefore, the second air supply pipeline 25 is arranged, initially, the first air supply pipeline 23 is in a cut-off state, the test gas is rapidly input into the cavity of the engine to a preset pressure value only through the second air supply pipeline 25, then the states of the first air supply pipeline 23 and the second air supply pipeline 25 are switched, and the gas is continuously conveyed through the first air supply pipeline 23, so that the cavity of the engine is kept at the preset pressure value, and at the moment, the flow detected by the mass flow meter 24 on the first air supply pipeline 23 is the leakage amount of the cavity of the engine.

In practical application, the air supply mechanism 20 includes at least two first air supply pipelines 23 and at least two mass flowmeters 24, the air inlet ends of all the first air supply pipelines 23 are all communicated with the air outlet end of the main pipeline 22, the air outlet end of any one first air supply pipeline 23 is simultaneously communicated with the air inlet ends of the first connecting air pipeline 31, the second connecting air pipeline 32 and the third connecting air pipeline 33, and each mass flowmeter 24 is disposed on a corresponding first air supply pipeline 23 and is used for detecting the flow of the test gas in the corresponding first air supply pipeline 23.

Therefore, the mass flowmeters 24 with different ranges can be arranged on different first air supply pipelines 23, so as to meet the test requirements of different cavities, and further improve the compatibility.

In some embodiments, the gas supply mechanism 20 further comprises a pressure relief valve 26, the pressure relief valve 26 being disposed on the main conduit 22 for ensuring that the gas source 21 outputs a test gas at a preset pressure through the main conduit 22.

It can be understood that when the air source 21 inputs the test gas into the cavity of the engine, the pressure inside the cavity is the same because the interior of the cavity is communicated with each other, and the pressure inside the cavity of the engine can be ensured to be a preset pressure value directly through the pressure reducing valve 26.

In some embodiments, the air supply mechanism 20 further includes at least two first control valves 27, and the at least two first control valves 27 are respectively disposed on the first air supply line 23 and the second air supply line 25 to respectively control on/off of the first air supply line 23 and the second air supply line 25, so that the first air supply line 23 and the second air supply line 25 are switched between a conducting state and a blocking state.

In practical applications, the air supply mechanism 20 includes at least three first control valves 27, and each first air supply pipeline 23 is provided with one first control valve 27.

In some embodiments, the air-tightness detecting apparatus further includes three second control valves 38, and the three second control valves 38 are respectively disposed on the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 to respectively control on/off of the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, so as to respectively switch the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 between an on state and an off state.

In some embodiments, the air-tightness detecting apparatus further includes three pressure detectors 39, the three pressure detectors 39 are respectively disposed on the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, and are all located on a side of the second control valve 38 away from the air supply mechanism 20, and the three pressure detectors 39 are used for respectively detecting air pressures in the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33. Specifically, the pressure detector 39 is a pressure sensor.

Since the first connecting air passage 31, the second connecting air passage 32 and the third connecting air passage 33 can be respectively communicated with the hydrogen chamber, the water chamber and the air chamber of the engine, the pressure detector 39 can respectively detect the air pressures of the hydrogen chamber, the water chamber and the air chamber.

After the gas supply mechanism 20 inputs the test gas into the hydrogen cavity, the water cavity or the air cavity of the engine through the first connecting gas path 31, the second connecting gas path 32 or the third connecting gas path 33 to reach a preset pressure value, the first connecting gas path 31, the second connecting gas path 32 or the third connecting gas path 33 are switched to a cut-off state, the air pressure detected by the pressure detector 39 is observed after a preset time, and the pressure change value detected by the pressure detector 39 reflects the air tightness of the cavity of the engine.

It should be noted that, in the present embodiment, the air tightness detecting device may detect the air tightness of the cavity of the engine by using the mass flow meter 24 to detect the flow rate (flow method), or may detect the air tightness of the cavity of the engine by using the pressure detector 39 to detect the air pressure change (pressure maintaining method), and may detect the air tightness by using two methods when necessary to verify the detection result and ensure the accuracy of the detection.

When the pressure maintaining method is adopted, the preset time is determined by an operator according to actual conditions, and the air tightness detection of the engine cavity by the flow method and the pressure maintaining method has a qualified standard, for example, the qualified standard of the flow method can be that the flow is smaller than a certain qualified flow value, and the qualified standard of the pressure maintaining method is that the pressure change value in the preset time is smaller than a certain qualified pressure value.

Meanwhile, in order to determine whether the air tightness detection device in this embodiment has self leakage, a calibration module method may be adopted, where the calibration module has a standard leak hole, and when the air pressure is a preset pressure, the leakage amount of the standard leak hole is a corresponding standard value, the first quick connector 34, the second quick connector 35, and the third quick connector 36 are connected to the corresponding calibration module, and then a flow method is adopted for detection.

If the value detected by the flow method is far larger than the standard value, the air tightness detection equipment has self leakage and needs to be checked; if the value detected by the flow method is in a normal range (the value is the same as the standard value or the value is in an error range with the standard value), the air tightness detection equipment can be normally used.

In some embodiments, the air-tightness detecting apparatus further includes an exhaust mechanism, the exhaust mechanism is configured to be simultaneously communicated with the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, a communication position of the exhaust mechanism with the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 is located between the second control valve 38 and the pressure detector 39, and the exhaust mechanism is configured to operatively communicate or separate the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 from the outside.

So, can separate first connecting gas circuit 31, second connecting gas circuit 32 and third connecting gas circuit 33 and external world when the test, after the test, intercommunication first connecting gas circuit 31, second connecting gas circuit 32 and third connecting gas circuit 33 and external world to discharge test gas.

Further, the air tightness detection device further comprises three third control valves 40, wherein the three third control valves 40 are respectively arranged on the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, are positioned between the communication positions of the exhaust mechanism and the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 and the pressure detector 39, and are used for respectively controlling the connection and disconnection of the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33.

Therefore, when the pressure maintaining method is used for testing, after the air pressure of the test gas in the cavity of the engine reaches the preset pressure value, the corresponding third control valve 40 is closed, the pressure detector 39 is positioned between the third control valve 40 and the engine, the air pressure of the cavity of the engine can be directly detected, and the communication position of the exhaust mechanism and the connecting air path is positioned between the third control valve 40 and the second control valve 38, so that the exhaust mechanism can be prevented from influencing the detection result.

In some embodiments, the exhaust mechanism includes three exhaust branches 41, an exhaust trunk 42 and an exhaust main valve 43, air inlet ends of the three exhaust branches 41 are respectively communicated with the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, an air inlet end of the exhaust trunk 42 is simultaneously communicated with air outlet ends of the three exhaust branches 41, and the exhaust main valve 43 is disposed on the exhaust trunk 42 and is used for controlling on-off of the exhaust trunk 42, so that the exhaust mechanism is communicated with or separates the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 from the outside.

Further, the exhaust mechanism further includes three fourth control valves 44, each fourth control valve 44 is disposed on a corresponding exhaust branch 41, and is configured to control on/off of the corresponding exhaust branch 41, so that the exhaust mechanism can separately realize communication between the first connection air path 31, the second connection air path 32, or the third connection air path 33 and the outside.

In some embodiments, the outlet end of the exhaust trunk 42 is provided with a silencer 45 to reduce the volume of noise generated when exhausting.

In some embodiments, the first control valve 27, the second control valve 38, the third control valve 40, the fourth control valve 44, and the exhaust main valve 43 are all pneumatic valves. Further, the air-tightness detecting device further comprises an air passage board 51, the air passage board 51 is disposed in the first inner cavity 111111, and the air supply mechanism 20 is disposed on the air passage board 51.

In practical application, the air channel plate 51 is provided with a pipeline for controlling the air-operated valves and an electromagnetic valve 52 for controlling the on-off of the corresponding pipeline, the air tightness detecting device further comprises an electric plate 53, and the controller is arranged on the electric plate 53, connected with the electromagnetic valve 52 and used for controlling the opening and closing of the electromagnetic valve 52 so as to control the opening and closing of each air-operated valve.

It should be explained in conjunction with the above-mentioned embodiments that the first, second and third

connection air paths

31, 32 and 33 are provided with pneumatic valves and connected with an air exhaust mechanism, so that the first, second and third

connection air paths

31, 32 and 33 are partially wound around the pipe coiling device 37.

In the second embodiment, the air-tightness detecting apparatus includes a machine 10, an air supply mechanism 20, a first connecting air path 31, a second connecting air path 32, a third connecting air path 33, and three pressure detectors 39.

The gas supply mechanism 20 is disposed on the machine 10 for supplying a testing gas.

First connecting gas circuit 31 one end is connected with air feed mechanism 20, the other end is used for the hydrogen chamber intercommunication with the engine, second connecting gas circuit 32 one end is connected with air feed mechanism 20, the other end is used for the water chamber intercommunication with the engine, third connecting gas circuit 33 one end is connected with air feed mechanism 20, the other end is used for the air chamber intercommunication with the engine, first connecting gas circuit 31, second connecting gas circuit 32 and third connecting gas circuit 33 all include the on-state that supplies the test gas flow and block the off-state that the test gas circulated.

The three pressure detectors 39 are respectively disposed on the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33, and when the first connecting air path 31, the second connecting air path 32 or the third connecting air path 33 is in a cut-off state, the corresponding pressure detectors 39 are used for detecting the air pressure of a hydrogen chamber of the engine, a water chamber of the engine or an air chamber of the engine.

In this embodiment, the air supply mechanism 20 can also deliver the test gas into the hydrogen cavity, the water cavity, or the air cavity of the engine through the first connection gas path 31, the second connection gas path 32, or the third connection gas path 33, after the input pressure reaches a preset pressure value, the first connection gas path 31, the second connection gas path 32, or the third connection gas path 33 is switched to a cut-off state, after a preset time, the pressure of the hydrogen cavity, the water cavity, or the air cavity is obtained through the pressure detector 39, and whether the air tightness of the hydrogen cavity, the water cavity, or the air cavity of the engine meets the requirement is judged according to the current pressure.

It should be noted that, in the first embodiment and the second embodiment, the air tightness of the cavity of the engine is detected by using a flow method and a pressure maintaining method, and each test is performed on only one cavity, that is, only one of the first connecting air path 31, the second connecting air path 32 and the third connecting air path 33 is in a conducting state, and the other two are in a blocking state.

Meanwhile, the preset pressure values may be different for different cavities, and the reading of the preset pressure values may be that the pressure sensor is arranged in the cavity of the engine or gas with the preset pressure values is provided by the gas supply mechanism 20, which is not limited herein.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An airtightness detection apparatus, comprising:

a machine platform;

2. The apparatus according to claim 1, wherein the gas supply mechanism comprises a gas source, a main pipeline, a first gas supply pipeline, and a mass flow meter;

3. The apparatus according to claim 2, wherein the gas supply mechanism includes at least two first gas supply lines and at least two mass flow meters, gas inlet ends of all the first gas supply lines are communicated with gas outlet ends of the main lines, a gas outlet end of any one of the first gas supply lines is simultaneously communicated with gas inlet ends of the first connecting gas line, the second connecting gas line and the third connecting gas line, and each mass flow meter is disposed on a corresponding one of the first gas supply lines.

4. The airtightness detection apparatus according to claim 2, wherein the gas supply mechanism further comprises a pressure reducing valve provided on the main pipeline.

5. The airtightness detection apparatus according to claim 2, wherein the gas supply mechanism further comprises a second gas supply line, a gas inlet end of the second gas supply line communicates with a gas outlet end of the main line, and a gas outlet end of the second gas supply line communicates with gas inlet ends of the first connection gas path, the second connection gas path, and the third connection gas path at the same time;

6. The apparatus according to claim 5, wherein the gas supply mechanism further comprises at least two first control valves, and the at least two first control valves are respectively disposed on the first gas supply pipeline and the second gas supply pipeline to respectively control on/off of the first gas supply pipeline and the second gas supply pipeline.

7. The airtightness detection apparatus according to claim 1, further comprising three second control valves, wherein the three second control valves are respectively disposed on the first connection air path, the second connection air path, and the third connection air path to respectively control on/off of the first connection air path, the second connection air path, and the third connection air path.

8. The airtightness detection apparatus according to claim 7, further comprising three pressure detectors, wherein the three pressure detectors are respectively disposed on the first connection gas path, the second connection gas path, and the third connection gas path, and are all located on a side of the second control valve away from the gas supply mechanism, and the three pressure detectors are configured to respectively detect gas pressures in the first connection gas path, the second connection gas path, and the third connection gas path.

9. The airtightness detection apparatus according to claim 8, further comprising an exhaust mechanism, wherein the exhaust mechanism is simultaneously communicated with the first connection gas path, the second connection gas path, and the third connection gas path, and a communication position of the exhaust mechanism with the first connection gas path, the second connection gas path, and the third connection gas path is located between the second control valve and the pressure detector, and the exhaust mechanism is configured to operatively communicate or separate the first connection gas path, the second connection gas path, and the third connection gas path with the outside.

10. The airtightness detection apparatus according to claim 9, further comprising three third control valves, the three third control valves being respectively disposed on the first connection gas path, the second connection gas path, and the third connection gas path, and being located between positions where the exhaust mechanism communicates with the first connection gas path, the second connection gas path, and the third connection gas path, and the pressure detector, for respectively controlling on/off of the first connection gas path, the second connection gas path, and the third connection gas path.

11. The airtightness detection apparatus according to claim 9, wherein the exhaust mechanism includes three exhaust branches, an exhaust trunk, and an exhaust main valve, an inlet end of each of the three exhaust branches is respectively communicated with the first connection air passage, the second connection air passage, and the third connection air passage, an inlet end of the exhaust trunk is simultaneously communicated with outlet ends of the three exhaust branches, and the exhaust main valve is disposed on the exhaust trunk and is configured to control on/off of the exhaust trunk.

12. The airtightness detection apparatus according to claim 11, wherein the exhaust mechanism further includes three fourth control valves, and each of the fourth control valves is disposed on a corresponding one of the exhaust branches and is configured to control on/off of the corresponding exhaust branch.

13. The airtightness detection apparatus according to claim 1, further comprising a first quick coupling, a second quick coupling, and a third quick coupling;

14. The airtightness detection apparatus according to claim 1, further comprising a pipe coiling device, wherein the pipe coiling device is disposed on the machine table, and the first connection air path, the second connection air path, and the third connection air path are partially wound around the pipe coiling device.

15. An airtightness detection apparatus, comprising:

a machine platform;