Pressure reducer for fuel gas metering valve of internal combustion engine

Abstract

The invention relates to the technical field of pressure reducers, in particular to an internal combustion engine gas metering valve pressure reducer which comprises a main shell, an upper shell and a lower shell which are fixedly connected in a sealed mode, an inner cavity of the main shell is provided with a gas inlet cavity, a flow-out cavity and a buffer cavity, and the buffer cavity is alternately communicated with the gas inlet cavity and the flow-out cavity through an electromagnetic valve. According to the pressure reducer, a stop valve or a valve body similar to the stop valve does not need to be installed at the front end or the rear end of the pressure reducer, the design of the original stop valve or the valve body similar to the stop valve is omitted, and the stop function of the stop valve is ingeniously combined to the passage of the pressure reducer; the feedback push plate and the elastic piece can be driven by the pressure of high-pressure gas to control the plugging piece to plug the passage of the pressure reducer, so that the high-pressure gas cannot pass through the pressure reducer, and the function of cutting off the high-pressure gas on the pressure reducer is still achieved under the condition that a stop valve or a valve body similar to the stop valve does not need to be installed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure reducers, in particular to a pressure reducer for a gas metering valve of an internal combustion engine. BACKGROUND

[0002] Natural gas has the characteristics of large reserves, safety and reliability, less pollution, easy storage and transportation, high thermal efficiency, etc. Compared with traditional diesel engines, natural gas engines can achieve higher air-fuel ratios, meet the increasingly increasing use requirements while meeting the national six regulations.

[0003] In the intake system of a natural gas engine, the gas metering valve plays a decisive role in controlling the amount of natural gas actually participating in combustion in the engine. If the gas metering valve pressure reducer fails, it will cause a series of serious consequences, such as unstable pressure reduction, which will cause the gas supply pressure to fluctuate, resulting in engine total speed jitter, power output imbalance; insufficient measurement accuracy will cause the air-fuel ratio to deviate from the optimal interval, not only increasing gas consumption, but also exacerbating ammonia and hydrocarbon emissions; more seriously, if the sealing of the pressure reduction component fails or the valve core is stuck, it may cause gas leakage and safety hazards. The release pressure of liquefied natural gas is generally around 17Barg, and the release pressure of compressed natural gas is higher. The metering valve cannot normally control the gas output under this pressure condition, and the intake control component of the valve core may also be damaged due to high pressure gas, so a pressure reducer is needed to reduce the pressure and stabilize it.

[0004] In order to protect various precise control structures in the gas circuit of the automobile engine, prevent high-pressure gas from directly rushing into each gas circuit through the pressure reducer when the gas is introduced, the current pressure reducer uses a scheme that uses a stop valve plug to block and uses an electromagnetic valve to connect different chambers to obtain a pressure difference to control the opening of the stop valve plug. Under the blocking action of the stop valve, high-pressure gas cannot pass through the pressure reducing valve, thereby achieving the effect of blocking high-pressure gas. The installation position of the stop valve is generally located at the front end or rear end of the pressure reducing valve, but this design also has problems: First, because the gas contains a lot of impurities, the sealing ring of the stop valve plug is prone to accumulate dust, causing the valve plug to be stuck, so that the valve plug cannot move as designed, the opening is delayed, the opening degree changes, the response speed slows down, and the pressure reduction effect is affected or even fails. Second, whether the stop valve is installed in front of or behind the pressure reducing valve, an additional process of installing the stop valve is required when the pressure reducing valve is installed, and after installation, the stop valve and the pressure reducing valve form an integral whole, resulting in an increase in the overall volume and weight of the pressure reducing valve. However, if the stop valve is not installed, the above-mentioned disadvantages will be automatically solved, but without the installation of the stop valve or a similar stop valve, the pressure reducer cannot block high-pressure gas, which is obviously a contradictory problem. Therefore, how to achieve the effect of blocking high-pressure gas for the pressure reducer without installing a stop valve or a similar stop valve is a technical problem that needs to be solved urgently. SUMMARY

[0005] The present application aims to provide an internal combustion engine gas metering valve pressure reducer to solve the problems presented in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an internal combustion engine gas metering valve pressure reducer, comprising a main housing, an upper housing and a lower housing connected in a sealing and fixed manner, an inner cavity of the main housing is formed with an inlet cavity, an outlet cavity and a buffer cavity, the buffer cavity is alternately communicated with the inlet cavity and the outlet cavity through an electromagnetic valve; A feedback push plate is sealingly installed between the opening of the buffer cavity and the opening of the upper housing; An elastic member is installed between the feedback push plate and the upper housing; A plugging member for controlling the passage is arranged between the lower housing and the main housing; When there is no gas, the elastic member extrudes the plugging member to open the passage; In the initial state, the buffer cavity is communicated with the inlet cavity to allow the gas to enter the buffer cavity when the gas is turned on, and the compressed elastic member is away from the plugging member to drive the plugging member to close the passage.

[0007] The internal combustion engine gas metering valve pressure reducer described above, the elastic member comprises a top rod abutment, a valve, a push plate spring and a fixed plate, one end of the push plate spring is fixedly connected with the fixed plate, the other end is fixedly connected with the valve, the fixed plate is fixedly connected with the inner cavity of the upper housing, the side of the valve away from the push plate spring is fixedly connected with the feedback push plate, and the top rod abutment is fixedly connected with the valve and sealingly presses the feedback push plate and abuts against the plugging member.

[0008] The internal combustion engine gas metering valve pressure reducer described above, the inner cavity of the main housing further comprises a communication cavity for communicating the inlet cavity and the outlet cavity, and the plugging member is located at one end of the communication cavity.

[0009] The internal combustion engine gas metering valve pressure reducer described above, the plugging member comprises a passage plug block slidingly and sealingly connected with the inner cavity of the lower housing, a combination tube fixedly and sealingly connected with the port of the communication cavity, and a top rod abutting against the top rod abutment at one end and connected with the passage plug block at the other end, a plug block spring is connected between the passage plug block and the lower housing, the elastic force of the plug block spring is smaller than that of the push plate spring, and the combination tube is sealingly and abuttingly connected with the passage plug block.

[0010] The internal combustion engine gas metering valve pressure reducer described above, a plurality of exhaust holes are arranged circumferentially on the passage plug block, the combination tube comprises a rubber ring sealingly and abuttingly connected with the end face of the passage plug block, and the ports of the plurality of exhaust holes are directed to the end face of the rubber ring abuttingly connected with the passage plug block, so that when the passage plug block slides towards the inner side of the lower housing, the gas discharged through the plurality of exhaust holes is blown towards the end face of the rubber ring abuttingly connected with the passage plug block.

[0011] The internal combustion engine gas metering valve pressure reducer has an annular groove opened on the end face of the joint tube towards the passage plug, a rubber ring fixedly installed on the joint tube, and the rubber ring is inserted into the annular groove and abuts against the inner wall of the annular groove to block the passage.

[0012] The internal combustion engine gas metering valve pressure reducer has a biasing cavity formed between the feedback push plate and the inner cavity of the upper shell, and the rear end of the outflow cavity is connected with the metering valve, and the gas pressure in the metering valve is communicated with the biasing cavity through the flow channel.

[0013] The internal combustion engine gas metering valve pressure reducer has a two-position three-way electromagnetic valve fixedly installed on the main shell, and the gas inlet of the electromagnetic valve is communicated with the gas inlet cavity through the third communication pipe, the gas outlet is communicated with the outflow cavity through the first communication pipe, and the output port is communicated with the buffer cavity through the second communication pipe.

[0014] The internal combustion engine gas metering valve pressure reducer has a valve plate abutting against the side wall of the upper shell on the side away from the feedback push plate, and the top rod abutting seat is separated from the top rod when the valve plate abuts against the upper shell.

[0015] The internal combustion engine gas metering valve pressure reducer has a top rod slidingly inserted into the main shell.

[0016] Compared with the prior art, the internal combustion engine gas metering valve pressure reducer has the following beneficial effects: The internal combustion engine gas metering valve pressure reducer has the following beneficial effects:

[0017] The design cancels the original stop valve plug, optimizes the gas flow passage in the main shell to meet the new functional requirements, simplifies the internal passage distribution to a certain extent, and further simplifies the mold and machining steps required for part processing, thereby reducing the cost and defective rate.

[0018] Moreover, since the passage plug is lower and the combination tube is higher during the operation of the pressure reducer, impurities in the gas are prone to fall on the end face of the passage plug in the long run, thereby affecting the sealing performance of the end face of the passage plug when abutting against the rubber ring. Therefore, the exhaust hole port is designed to make the gas discharged when the passage plug slides towards the inner side of the lower shell pass through the ports of multiple exhaust holes and blow to the end face of the passage plug abutting against the rubber ring, so that the impurities and dust at the end face position of the passage plug abutting against the rubber ring are removed. It can be seen that the gas pressure generated when the passage plug slides is ingeniously used to produce the unexpected technical effect of cleaning the impurities at the end face position of the passage plug abutting against the rubber ring. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0020] Figure 1 The appearance structure schematic diagram of the gas metering valve pressure reducer of the internal combustion engine provided by the embodiment of the present application is shown in the figure. Figure 2 The split structure schematic diagram of the ejector rod, the passage plug and the combination tube provided by the embodiment of the present application is shown in the figure. Figure 3 The cross-sectional structure schematic diagram of the passage in the initial state of the passage being in the conducting state is shown in the figure. Figure 4 The cross-sectional structure schematic diagram of the passage in the non-conducting state is shown in the figure. Figure 5 The three-dimensional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 4 Figure 6 The communication relationship schematic diagram between the electromagnetic valve and the inlet cavity, the outlet cavity and the buffer cavity provided by the embodiment of the present application is shown in the figure. Figure 7 The cross-sectional schematic diagram between the passage plug and the combination tube in the second embodiment provided by the embodiment of the present application is shown in the figure.

[0021] Explanation of reference signs: ​1, main housing; 101, air inlet cavity; 1011, air inlet cavity interface; 102, communication cavity; 103, outflow cavity; 1031, outflow cavity interface; 104, buffer cavity; 105, bias cavity; 2, top rod; 3, passage plug; 301, annular groove; 302, socket; 303, exhaust hole; 4, plug spring; 5, combination tube; 501, rubber ring; 6, top rod seat; 7, valve; 8, feedback push plate; 9, push plate spring; 10, fixed plate; 11, upper housing; 1101, upper housing cover; 12, lower housing; 13, electromagnetic valve; 14, pipe joint; 15, first communication pipe; 16, second communication pipe; 17, third communication pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] First embodiment: Please refer to Figures 1-6 The present application provides a gas metering valve pressure reducer for internal combustion engine, comprising a main housing 1, an upper housing 11 and a lower housing 12 which are sealingly and fixedly connected, the inner cavity of the main housing 1 is formed with an air inlet cavity 101, an outflow cavity 103 and a buffer cavity 104, the buffer cavity 104 is alternately communicated with the air inlet cavity 101 and the outflow cavity 103 through an electromagnetic valve 13; A feedback push plate 8 is sealingly installed between the opening of the buffer cavity 104 and the opening of the upper housing 11; An elastic member is installed between the feedback push plate 8 and the upper housing 11; A plugging member for controlling the passage is arranged between the lower housing 12 and the main housing 1; When there is no gas, the elastic member extrudes the plugging member to open the passage; In the initial state, the buffer cavity 104 is communicated with the air inlet cavity 101 to make the gas enter the buffer cavity 104 when the gas is inputted, and the compressed elastic member is away from the plugging member to drive the plugging member to close the passage.

[0024] Specifically, the pressure reducer is located upstream of the metering valve, the upper shell 11 and the lower shell 12 are sequentially fixed and sealedly installed on the left side and the right side of the main shell 1, the upper shell 11 is sealedly and fixedly installed with an upper shell cover 1101 at the end away from the main shell 1 to block one end of the inner cavity of the upper shell 11, and the inner cavity of the upper shell 11 is open at the end away from the upper shell cover 1101 to serve as an opening of the upper shell 11, the lower shell 12 is blocked at the end away from the main shell 1, and the inner cavity of the lower shell 12 is open at one end and sealed at other parts, the inner cavity of the main shell 1 includes multiple cavities, such as an air inlet cavity 101, a communication cavity 102, an outflow cavity 103, and a buffer cavity 104, the air inlet cavity 101, the communication cavity 102, and the outflow cavity 103 are sequentially communicated to form a passage of the pressure reducer, a blocking piece is located between the air inlet cavity 101 and the outflow cavity 103 and is used to control the opening and closing of the passage, and more specifically, the communication cavity 102 is used to communicate the air inlet cavity 101 and the outflow cavity 103, and the blocking piece is located at one end of the communication cavity 102, when the blocking piece is in a closed state, the passage is not conductive, and when the blocking piece is in an open state, the passage is conductive. The buffer cavity 104 is alternately conductive with the air inlet cavity 101 and the outflow cavity 103 through an electromagnetic valve 13, the electromagnetic valve 13 is a two-position three-way electromagnetic valve or a five-position three-way electromagnetic valve, and in the present application, the electromagnetic valve 13 is preferably a two-position three-way electromagnetic valve, the structure and working principle of the two-position three-way electromagnetic valve are prior art, and will not be described in detail. The electromagnetic valve 13 is fixedly installed on the main shell 1, the air inlet of the electromagnetic valve 13 is communicated with the air inlet cavity 101 through a third communication pipe 17, the exhaust port of the electromagnetic valve 13 is communicated with the outflow cavity 103 through a first communication pipe 15, and the output port of the electromagnetic valve 13 is communicated with the buffer cavity 104 through a second communication pipe 16, the air inlet cavity 101 is provided with an air inlet cavity interface 1011, the outflow cavity 103 is provided with an outflow cavity interface 1031, the air inlet cavity interface 1011 is used to connect the third communication pipe 17, the outflow cavity interface 1031 is used to connect the first communication pipe 15, and the air inlet cavity 101 is fixedly and sealingly inserted with a pipe joint 14, and the gas enters the air inlet cavity 101 from the pipe joint 14. In the demagnetization state, the air inlet of the electromagnetic valve 13 is conductive with the output port, and the exhaust port of the electromagnetic valve 13 is not conductive with the output port, so as to realize the conduction of the buffer cavity 104 with the air inlet cavity 101 and the non-conduction of the buffer cavity 104 with the outflow cavity 103; in the magnetization state, the air inlet of the electromagnetic valve 13 is not conductive with the output port, and the exhaust port of the electromagnetic valve 13 is conductive with the output port, so as to realize the non-conduction of the buffer cavity 104 with the air inlet cavity 101 and the conduction of the buffer cavity 104 with the outflow cavity 103.

[0025] The opening of the upper shell 11 is opposite to the opening of the buffer cavity 104, the feedback push plate 8 is located between the opening of the buffer cavity 104 and the opening of the upper shell 11, the feedback push plate 8 is sealed and extruded by the main shell 1 and the upper shell 11 to be fixed so that the feedback push plate 8 seals the opening of the buffer cavity 104 and the opening of the upper shell 11, a biasing cavity 105 is formed between the feedback push plate 8 and the inner cavity of the upper shell 11, an elastic member is installed between the feedback push plate 8 and the upper shell 11, the elastic member cooperates with the feedback push plate 8, and the contraction of the elastic member is caused by the change of the pressure difference between the buffer cavity 104 and the biasing cavity 105. The lower shell 12 corresponds to the communication cavity 102 so that the inner cavity of the lower shell 12 is opposite to and communicated with the communication cavity 102, the blocking member for controlling the passage is arranged between the lower shell 12 and the main shell 1, the blocking member is located at the opening of the communication cavity 102, the blocking member has two states of opening and closing, when the blocking member is in the closed state, the opening of the communication cavity 102 is blocked, so that the passage of the pressure reducer formed by the inlet cavity 101, the communication cavity 102 and the outflow cavity 103 is not conducted, when the blocking member is in the open state, the opening of the communication cavity 102 is opened, at this time, the passage of the pressure reducer formed by the inlet cavity 101, the communication cavity 102 and the outflow cavity 103 is conducted. Whether the blocking member is in the closed state or the open state depends on the contraction degree of the elastic member, and the contraction degree of the elastic member depends on the pressure difference between the buffer cavity 104 and the biasing cavity 105, when there is no gas, the elastic member extrudes the blocking member to open the passage, in the gas state, when there is no extrusion force between the elastic member and the blocking member, the blocking member is closed to make the passage not conducted, when there is an extrusion force between the elastic member and the blocking member, the blocking member is opened to make the passage conducted, and the greater the extrusion force between the elastic member and the blocking member, the greater the opening degree of the blocking member.

[0026] The working principle of the passage closed by the blocking member is as follows: in the initial state, the electromagnetic valve 13 is in the demagnetization state, at this time, the buffer cavity 104 is communicated with the inlet cavity 101, the buffer cavity 104 is not communicated with the outflow cavity 103, and the blocking member is in the open state, when the gas is introduced, since the inlet cavity 101 is communicated with the buffer cavity 104, the gas enters the buffer cavity 104 through the third communication pipe 17, the electromagnetic valve 13 and the second communication pipe 16 to increase the internal pressure of the buffer cavity 104, the increased internal pressure of the buffer cavity 104 extrudes the feedback push plate 8 to move away from the blocking member, the feedback push plate 8 also compresses the elastic member to move away from the blocking member to separate the elastic member from the blocking member, at this time, there is no extrusion force between the elastic member and the blocking member to make the blocking member close the passage of the pressure reducer, thereby realizing the function of cutting off the high-pressure gas of the pressure reducer, without installing a stop valve or a valve body similar to the stop valve. When the passage of the pressure reducer needs to be conducted, only the electromagnetic valve 13 needs to be magnetized, which is described in detail below.

[0027] Therefore, the application does not need to install a stop valve or a valve body similar to the stop valve at the front end or the rear end of the pressure reducer, cancels the original stop valve or the valve body similar to the stop valve, and ingeniously combines the stop function of the stop valve to the passage of the pressure reducer, so that when the high-pressure gas flows into the pressure reducer, the feedback push plate 8 and the elastic member can control the blocking member to block the passage of the pressure reducer by using the pressure of the high-pressure gas itself, so that the high-pressure gas cannot pass through the pressure reducer, and the application can still realize the function of cutting off the high-pressure gas from the pressure reducer without installing the stop valve or the valve body similar to the stop valve.

[0028] Through the cooperation of the feedback push plate 8, the elastic member and the blocking member, the application can not only realize the function of controlling the opening degree of the passage of the pressure reducer in the prior art, but also realize the function of closing the passage of the pressure reducer which is not provided in the prior art.

[0029] In the embodiment, the elastic member includes a top rod abutting seat 6, a valve 7, a push plate spring 9 and a fixed plate 10, one end of the push plate spring 9 is fixedly connected with the fixed plate 10, the other end is fixedly connected with the valve 7, the valve 7 is made of the existing technology and will not be described in detail, the fixed plate 10 is fixedly connected with the inner cavity of the upper shell 11, one side of the valve 7 away from the push plate spring 9 is fixedly connected with the feedback push plate 8, the top rod abutting seat 6 is fixedly connected with the valve 7 and seals and presses the feedback push plate 8, and the valve 7, the feedback push plate 8 and the top rod abutting seat 6 are coaxially arranged.

[0030] Furthermore, the blocking member includes a passage plug 3 which is in sliding sealing connection (the sliding sealing connection means that the two are in sliding connection and sealing) with the inner cavity of the lower shell 12, a combination tube 5 which is in fixed sealing connection with the port of the communication cavity 102, a top rod 2 which is in abutting connection with the top rod abutting seat 6 at one end and is in abutting connection with the passage plug 3 at the other end, the top rod 2 is fixedly connected with the passage plug 3 or is clamped or bonded, the passage plug 3 is provided with a socket 302 in the center for connecting the top rod 2, the passage plug 3 is connected with the lower shell 12 through a plug spring 4, one end of the passage plug 3 is provided with a flange, one end of the plug spring 4 is in abutting connection with the flange of the passage plug 3, and the other end is in abutting connection with the lower shell 12, the plug spring 4 is used to provide the passage plug 3 with elastic force, so that when there is no extrusion force between the top rod abutting seat 6 and the top rod 2, the plug spring 4 pushes the passage plug 3 to be in sealing abutting connection with the combination tube 5, the elastic force of the plug spring 4 is smaller than that of the push plate spring 9, so that the push plate spring 9 can push the top rod abutting seat 6 to extrude the top rod 2, drive the passage plug 3 to slide into the inner cavity of the lower shell 12, and then separate the passage plug 3 from the combination tube 5. The combination tube 5 is in sealing abutting connection with the passage plug 3 (the sealing abutting connection means that the two are in sealing state after abutting connection), the blocking member is closed when the combination tube 5 and the passage plug 3 are in abutting connection, and the blocking member is opened when the combination tube 5 and the passage plug 3 are separated.

[0031] The passage plug 3 is provided with an annular groove 301 at the end face facing the joint pipe 5, the joint pipe 5 is fixedly provided with a rubber ring 501, the rubber ring 501 is insertedly matched with the annular groove 301, the radial thickness of the rubber ring 501 is less than the radial thickness of the annular groove 301, the rubber ring 501 is inserted into the annular groove 301 and abuts against the inner wall of the annular groove 301 to block the passage, and the rubber ring 501 does not abut against the inner wall of the annular groove 301 to make the passage open.

[0032] Further, the passage plug 3 is provided with an exhaust hole 303 axially penetrating the passage plug 3, which is used for exhausting when the passage plug 3 slides.

[0033] The feedback push plate 8 and the inner cavity of the upper shell 11 form a biasing cavity 105, the rear end of the outflow cavity 103 is connected with a metering valve, and the gas pressure in the metering valve is communicated with the biasing cavity 105 through a flow channel (not shown in the figure).

[0034] Through the unfolding of the above structure, the whole working operation of the pressure reducer is introduced in detail: in the initial state, referring to the evolution process, Figures 3 to 4 firstly, the electromagnetic valve 13 is in a demagnetization state, the inlet cavity 101 and the buffer cavity 104 are communicated, the top rod abutting seat 6 and the top rod 2 abut, the passage plug 3 and the rubber ring 501 are separated under the elastic force of the push plate spring 9, the gas enters the inlet cavity 101 from the pipe joint 14, the gas pressure in the inlet cavity 101 rises, the high-pressure gas in the inlet cavity 101 enters the buffer cavity 104 through the third communication pipe 17, the electromagnetic valve 13 and the second communication pipe 16, the gas pressure in the buffer cavity 104 also rises, and since the gas pressure in the buffer cavity 104 is much higher than that in the biasing cavity 105, the feedback push plate 8 drives the valve 7 to move towards the push plate spring 9, the push plate spring 9 is compressed, and the top rod abutting seat 6 and the top rod 2 are separated, at this time, the passage plug 3 is pushed to seal and abut against the rubber ring 501 under the elastic force of the plug spring 4, so that the passage is closed; then referring to Figures 4 to 3The process evolution process is as follows: the solenoid valve 13 is energized to cut off the connection between the inlet cavity 101 and the buffer cavity 104 and instead connect the outflow cavity 103 and the buffer cavity 104, so that the fuel gas in the buffer cavity 104 gradually flows into the outflow cavity 103 and the pressure gradually releases, and then the valve 7, the top rod abutting seat 6 and the feedback push plate 8 are moved towards the top rod 2 under the elastic force of the push plate spring 9, and the top rod abutting seat 6 abuts against the top rod 2 and pushes the top rod 2, the top rod 2 pushes the passage plug 3 to slide away from the combination pipe 5 against the elastic force of the plug spring 4, so that the passage plug 3 is separated from the rubber ring 501, and the passage is in an open state, and then the fuel gas flows into the rear end of the pressure reducer from the outflow cavity 103, the rear end is connected with a metering valve, the gas pressure in the metering valve is communicated with the biasing cavity 105 through a flow channel, and the pressure difference between the biasing cavity 105 and the buffer cavity 104 changes the positions of the valve 7, the top rod abutting seat 6 and the feedback push plate 8 in real time, and then the distance between the passage plug 3 and the rubber ring 501 is changed, and finally the size of the flow area between the inlet cavity 101 and the outflow cavity 103 is changed, so that the effect of pressure boost biasing adjustment is achieved.

[0035] The design cancels the original stop valve plug, optimizes the airflow passage in the main shell 1 to meet the new functional requirements, and to some extent simplifies the internal passage distribution, and then the mold required for part processing and the machining steps are further simplified, thereby reducing the cost and the defective rate.

[0036] In the embodiment, the valve 7 is in abutting fit with the side wall of the upper shell 11 on the side away from the feedback push plate 8, the valve 7 is in abutting fit with the upper shell 11, the top rod abutting seat 6 is separated from the top rod 2, the abutting fit of the valve 7 and the upper shell 11 can limit the feedback push plate 8, and prevent the deformation of the feedback push plate 8 from being too large when the internal pressure of the buffer cavity 104 continuously increases, thereby affecting the service life.

[0037] The top rod 2 is slidably inserted into the main shell 1, so that the main shell 1 provides support for the top rod 2 and improves the stability of the top rod 2.

[0038] Second embodiment: The application also provides another embodiment, which is different from the first embodiment in that Figure 7As shown, the design of the annular groove 301 on the passage plug 3 is cancelled, and the position of the exhaust hole 303 is redesigned, which is adapted to the inner diameter of the connecting tube 5 and the diameter of the rubber ring 501. The passage plug 3 is provided with a plurality of exhaust holes 303 arranged in a circumferential direction, and the connecting tube 5 comprises a rubber ring 501 in sealing abutting cooperation with the end face of the passage plug 3, and the ports of the plurality of exhaust holes 303 are directed to the end face of the passage plug 3 in abutting cooperation with the rubber ring 501, so that the gas discharged when the passage plug 3 slides towards the inner side of the lower shell 12 blows towards the end face of the passage plug 3 in abutting cooperation with the rubber ring 501 through the ports of the plurality of exhaust holes 303.

[0039] Since the passage plug 3 is lower and the connecting tube 5 is higher during the operation of the pressure reducer, impurities in the gas are easy to fall on the end face of the passage plug 3 during a long period of time, thereby affecting the sealing performance when the end face of the passage plug 3 abuts against the rubber ring 501. Therefore, the application is designed by directing the ports of the exhaust holes 303, so that the gas discharged when the passage plug 3 slides towards the inner side of the lower shell 12 blows towards the end face of the passage plug 3 in abutting cooperation with the rubber ring 501 through the ports of the plurality of exhaust holes 303, so that the impurities and dust at the position of the end face of the passage plug 3 in abutting cooperation with the rubber ring 501 are removed. It can be seen that by skillfully using the gas pressure generated when the passage plug 3 slides, an unexpected technical effect of cleaning the impurities at the position of the end face of the passage plug 3 in abutting cooperation with the rubber ring 501 is achieved.

[0040] It should be noted that the electric equipment involved in the application can be powered by a storage battery or an external power source, and the application is provided with a control system for controlling the operation of the entire equipment.

[0041] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances, and the relevant direction and position involved in the application are relative to the drawings, and "upstream" and "downstream" are relative to the flow direction of the gas.

[0042] Although the embodiments of the application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A gas metering valve pressure reducer for internal combustion engine, comprising a main housing (1), an upper housing (11) and a lower housing (12) fixedly connected in seal, characterized in that: the inner cavity of the main housing (1) is formed with an inlet cavity (101), an outlet cavity (103) and a buffer cavity (104), the buffer cavity (104) is alternately communicated with the inlet cavity (101) and the outlet cavity (103) through an electromagnetic valve (13); a feedback push plate (8) is sealingly installed between the opening of the buffer cavity (104) and the opening of the upper housing (11); an elastic member is installed between the feedback push plate (8) and the upper housing (11); a blocking member for controlling the passage is arranged between the lower housing (12) and the main housing (1); the elastic member extrudes the blocking member to open the passage when there is no gas; in the initial state, the buffer cavity (104) is communicated with the inlet cavity (101) to make the gas enter the buffer cavity (104) when the gas is turned on, so as to compress the elastic member away from the blocking member to drive the blocking member to close the passage. The elastic member comprises a top rod abutment (6), a valve (7), a push plate spring (9), and a fixed plate (10), one end of the push plate spring (9) is fixedly connected with the fixed plate (10), the other end is fixedly connected with the valve (7), the fixed plate (10) is fixedly connected with the inner cavity of the upper housing (11), the side of the valve (7) away from the push plate spring (9) is fixedly connected with the feedback push plate (8), and the top rod abutment (6) is fixedly connected with the valve (7) and sealingly presses the feedback push plate (8), and then abuts against the blocking member. The inner cavity of the main housing (1) further comprises a communication cavity (102) for communicating the inlet cavity (101) and the outlet cavity (103), and the blocking member is located at one end of the communication cavity (102). The blocking member comprises a passage plug (3) slidingly and sealingly connected with the inner cavity of the lower housing (12), a combination tube (5) fixedly and sealingly connected with the port of the communication cavity (102), and a top rod (2) connected with the passage plug (3) at one end and abutting against the top rod abutment (6) at the other end, a plug spring (4) is connected between the passage plug (3) and the lower housing (12), the elastic force of the plug spring (4) is smaller than that of the push plate spring (9), and the combination tube (5) is sealingly and abuttingly connected with the passage plug (3). A plurality of exhaust holes (303) are arranged circumferentially on the passage plug (3), the combination tube (5) comprises a rubber ring (501) sealingly and abuttingly connected with the end face of the passage plug (3), and the ports of the plurality of exhaust holes (303) are directed to the end face of the passage plug (3) abuttingly connected with the rubber ring (501), so that when the passage plug (3) slides towards the inner side of the lower housing (12), the gas discharged through the ports of the plurality of exhaust holes (303) is blown towards the end face of the passage plug (3) abuttingly connected with the rubber ring (501). ​ ​ 2. The multi-functional device of claim 1, wherein: ​ 3. The multi-functional device of claim 2, wherein: ​ 4. The multi-functional device of claim 3, wherein: ​ 5. The multi-functional device of claim 4, wherein: ​ 6. The multi-functional device of claim 4, wherein: The passage plug block (3) is provided with an annular groove (301) towards the end face of the joint pipe (5), the joint pipe (5) is fixedly provided with a rubber ring (501), the rubber ring (501) is in plug-in cooperation with the annular groove (301), and the rubber ring (501) is inserted into the annular groove (301) and abuts against the inner wall of the annular groove (301) to block the passage.

7. The multi-functional device of claim 1, wherein: The feedback push plate (8) and the inner cavity of the upper shell (11) form a biasing cavity (105), the rear end of the outflow cavity (103) is connected with a metering valve, and the gas pressure in the metering valve is communicated with the biasing cavity (105) through a flow channel.

8. The multi-functional device of claim 1, wherein: The electromagnetic valve (13) is a two-position three-way electromagnetic valve, the electromagnetic valve (13) is fixedly installed on the main shell (1), the gas inlet of the electromagnetic valve (13) is communicated with the gas inlet cavity (101) through the third communication pipe (17), the gas outlet is communicated with the outflow cavity (103) through the first communication pipe (15), and the output port is communicated with the buffer cavity (104) through the second communication pipe (16).

9. The multi-functional device of claim 4, wherein: The valve (7) is away from the feedback push plate (8) and is in abutting cooperation with the side wall of the upper shell (11), and the valve (7) abuts against the upper shell (11), and the top rod abutting seat (6) is separated from the top rod (2).

10. The multi-functional device of claim 4, wherein: The top rod (2) is in sliding plug-in cooperation with the main shell (1).

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