A hydrogenation port

Abstract

The present invention relates to a hydrogenation port, comprising a one-way valve and a filtering device, wherein the one-way valve comprises a valve body with a valve cavity provided therein, a spherical valve flap provided inside the valve cavity, and a valve seat matched and sealed with the spherical valve flap; the valve body comprises an upper valve body provided with a fluid outlet and a lower valve body provided with a fluid inlet; the valve seat is provided at the fluid inlet; the upper valve body is provided with a receiving groove for accommodating the spherical valve flap at a position directly above the fluid inlet; the spherical valve flap and the valve seat are made of magnetic materials, the spherical valve flap is reset by magnetic force and contacts and seals with the valve seat; the filtering device is installed at the fluid inlet. Compared with the prior art, the present invention can avoid valve flap vibration, and has the advantages of simple structure, small number of parts, convenient assembly, high reliability, and long service life.

Description

Technical Field

[0001] The invention relates to the field of hydrogen supply systems, in particular to a hydrogen filling port. Background Art

[0002] The hydrogen refueling port is used for hydrogen fuel cell vehicles. The hydrogen refueling port can be connected to the hydrogen refueling gun to introduce high-pressure hydrogen from the hydrogen refueling gun into the hydrogen refueling port and then into the hydrogen storage system. The hydrogen refueling port is usually composed of a connector that is compatible with the hydrogen refueling gun, a filter, a one-way valve, and an interface connected to the back-end pipeline. The one-way valve modules of the hydrogen refueling ports on the market all use spring mechanisms. The springs are affected by their own material properties, heat treatment processes, etc., which have a relatively large impact on the medium applicability and one-way valve life.

[0003] When hydrogen passes through the hydrogen filling port, the medium force will push open the one-way valve disc and compress the spring. When the flow rate and pressure are certain, the pressure in the hydrogen storage tank is close to the pressure in the supply pipe of the hydrogen supply station, and the pressure difference between the upstream and downstream sides of the hydrogen filling port becomes smaller. When the medium force is close to the spring force, the valve disc will hit the valve disc repeatedly with high frequency, so that the force of the valve body to the valve seat is balanced with the pressure difference. The frequent and repeated state of the valve body sitting on the valve seat or separating from the valve seat is called vibration, forming "valve disc vibration". Hydrogen filling port valve disc vibration often occurs when fueling fuel cell vehicles. This phenomenon has a negative impact on the service life of the hydrogen filling port and the safety of the entire vehicle.

[0004] In addition, hydrogen has a strong ability to penetrate materials, and this phenomenon is particularly evident in high-pressure hydrogen environments. Non-metallic seals (especially rubber) often experience a significant increase in mass and volume in high-pressure hydrogen, commonly known as "swelling." Unlike normal temperature and low pressure (≤30MPa) working conditions, the selection of non-metallic sealing materials has always been a difficult point in 70MPa hydrogen valves. In order to meet the permeation of high-pressure hydrogen and to ensure the FCV's temperature requirements of -40 to +85°C, the requirements for rubber materials are very high, and the selection of rubber materials is relatively difficult. Moreover, rubber materials are prone to failure after aging, and their service life is usually about 3 years, which cannot meet the vehicle quality requirements of 15 years.

[0005] Chinese patent CN106949267A discloses a new type of high-pressure hydrogenation port, which mainly solves the problem of lack of a small interface for filtering and preventing backflow between the hydrogen filling system and the hydrogen storage system or the hydrogen using equipment. The present invention adopts a new type of high-pressure hydrogenation port, including a valve body and a valve cover connected to each other. The valve body and the valve cover are provided with a filtering device and a one-way check device. The one-way valve in this patented technology uses a spring to provide the restoring force of the valve disc, which will cause a large vibration problem. This is because the medium force and the reset force generated by the spring in the one-way check device in the patented technology are in opposition. The greater the medium force, the more displacement the valve disc will produce. The pressure difference change on both sides of the valve disc will cause the spring valve disc to vibrate back and forth in it. In particular, when the valve is under low flow conditions, the valve disc opening is relatively small, which is more prone to vibration. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a hydrogenation port which effectively improves the vibration and has no non-metallic seals.

[0007] A hydrogen filling port comprises a one-way valve and a filtering device, wherein the one-way valve comprises a valve body with a valve cavity provided therein, a spherical valve flap provided inside the valve cavity, and a valve seat which is matched and sealed with the spherical valve flap; the valve body comprises an upper valve body with a fluid outlet and a lower valve body with a fluid inlet; the valve seat is provided at the fluid inlet; the upper valve body is provided with a receiving groove for receiving the spherical valve flap at a position directly above the fluid inlet; the spherical valve flap and the valve seat are made of magnetic materials, the spherical valve flap is reset by magnetic force and contacts and seals with the valve seat; the filtering device is installed at the fluid inlet.

[0008] The spherical valve flap and the valve seat are made of permanent magnet materials; the valve body is made of non-magnetic material that will not be attracted by magnetism, preferably austenitic stainless steel.

[0009] The accommodating groove is a spherical groove matching the shape of the spherical valve flap.

[0010] The fluid outlet comprises a connected outlet pipeline interface, a fluid outlet main channel, and a branch channel connected to the side of the fluid outlet main channel, the branch channel is connected to the valve cavity; a threaded external pipeline is arranged inside the outlet pipeline interface.

[0011] There are two branch channels, which are symmetrically arranged on both sides of the fluid outlet main channel; the accommodating groove is located between the two branch channels.

[0012] The upper valve body and the lower valve body are fixedly connected by threads, and the upper valve body and the lower valve body are sealed by a first metal hard sealing surface arranged on the end surface of the upper valve body.

[0013] The lower valve body is provided with a second metal hard sealing surface, and the second metal hard sealing surface is sealedly connected to the lower end surface of the valve seat.

[0014] A third metal hard sealing surface is provided at the contact portion between the valve seat and the spherical valve disc, and the third metal hard sealing surface is sealingly connected to the spherical valve disc.

[0015] The fluid inlet comprises a connection section connected to an external pipeline and a fluid inlet channel connected to the valve chamber; the filtering device comprises an O-ring arranged on the connection section and a filter screen arranged on the end of the fluid inlet channel; the O-ring contacts and seals with the external pipeline.

[0016] The filter screen is a spherical filter screen that protrudes toward the connecting section of the fluid inlet.

[0017] The hydrogenation port of the present invention can effectively solve the vibration problem, and its main working principle is:

[0018] The characteristic of magnetic field is that the farther away from the magnetic field source, the weaker the magnetic field. In this hydrogenation port, when the valve disc contacts the valve seat, the valve disc is subjected to the strongest suction force generated by the magnetic field strength of the valve seat; when the valve disc leaves the valve seat, the suction force on the valve disc continues to weaken as the opening height increases.

[0019] The one-way valve is an automatic valve that relies on the medium force to seal and open. In this solution, the opening of the one-way valve requires the medium pressure from the upstream of the valve. 介 )>Valve disc initial suction force (F 吸初 ), the one-way valve opens. Once the one-way valve opens, a stroke is generated, and the distance between the valve disc and the valve seat is greater than the initial distance when the valve disc is closed. Medium force (F 介 )>Valve disc initial suction force (F 吸初 )>Suction after the valve flap is opened (F 吸 ), so once the valve disc meets the opening conditions, the force on the valve disc is in an unbalanced state, and it will definitely move directly to the maximum stroke (limit position). And when the medium is flowing (when hydrogen is filled), the valve disc is always at the maximum stroke and will not reset.

[0020] When using spring reset in the prior art, the force characteristic of the spring is F = kx, and the spring force is proportional to the deformation amount. That is to say, the more it is compressed, the greater the rebound force. In the hydrogenation port, when the valve flap contacts the valve seat, the spring force that makes the valve flap sealed by the spring is the smallest. When the valve flap leaves the valve seat, as the opening height increases, the spring force received by the valve flap becomes greater and greater. When the medium force (F_media) > the initial force of the valve flap (F_spring_initial), the check valve opens. After the check valve opens, a stroke is generated, and the distance between the valve flap and the valve seat > the initial distance when the valve flap is closed. The medium force (F_media) > the initial force of the valve flap (F_spring_initial) < the spring force after the valve flap opens (F_spring). Therefore, once the valve flap meets the opening condition, the force on the valve flap is in an unbalanced state, and tremors may occur as the medium force and the spring force tug-of-war.

[0021] Therefore, when using magnetic reset, the magnetic valve flap is either open or closed. The force when the magnetic valve flap is pushed open is the maximum force required for the magnetic valve flap. Once the medium force flushes open the magnetic valve flap, as long as the medium force (F 介 ) > the suction force after the valve flap opens (F 吸 ), the magnetic valve flap will remain in the open state; while using a spring valve flap, the greater the medium force, the greater the opening until it reaches the maximum and cannot open further. Then the opening of the valve flap will change with the change of the medium force. When the medium force is small and the medium force fluctuates, the opening of the valve flap will repeatedly switch between the closed and open states.

[0022] The working process of the hydrogenation port of the present invention is as follows:

[0023] When the check valve is ventilated, the gas flows from the fluid inlet of the lower valve body to the fluid outlet of the upper valve body. The airflow force will separate the spherical valve flap and the valve seat, open the fluid inlet channel, and the spherical valve flap will fall into the spherical groove and will not be blown to other positions in the cavity by the airflow. The airflow passes through the branch channel and the main fluid outlet channel, and then flows out from the outlet pipeline interface;

[0024] When the check valve is not ventilated, the spherical valve flap is reset under the mutual magnetic force between it and the valve seat, forms a seal at the third metal hard seal surface, and is effectively sealed under the action of the medium force. Compared with the gravity reset seal used in the prior art, the magnetic reset seal of the check valve of the present invention can improve the reliability of the reset action and ensure the sealing effect.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) Under small flow conditions of the hydrogenation port of the present invention, as long as the medium force (F 介 ) > the suction force after the valve flap opens (F 吸), the one-way valve can remain open, the ball valve disc falls into the groove, and the ball valve disc will not be sucked back by the magnetic force because of the distance and the magnetic force cannot reach it, and it will be reset until there is no air flow pressure (i.e. F 介 <F 吸 ), the spherical valve disc will automatically fall back onto the valve seat and perform magnetic sealing; this effectively solves the problem of valve disc vibration and can be used in hydrogen fuel cell vehicles, instruments, chemicals, automobiles, semiconductors, etc.

[0027] (2) There are fewer parts inside the valve cavity, no springs and guide mechanisms, so there is no negative effect of the spring, which improves the temperature applicability and medium applicability of the hydrogenation port, and improves the life and reliability of the hydrogenation port; because there are fewer parts inside the valve cavity, there will be no vibration, the medium flow is more stable, and the pressure and flow loss of the one-way valve is extremely small;

[0028] (3) The hydrogenation port has only 6 parts, which is easy to process, has strong manufacturability and high reliability;

[0029] (4) The present invention optimizes the selection of sealing material. The hydrogenation port does not use any non-metallic sealing components. Therefore, the hydrogenation port has excellent medium applicability, temperature applicability, and service life. It does not require any daily maintenance, has a wide range of applications, and is more reliable.

[0030] (5) The spherical valve disc used has excellent guiding properties and can automatically center without deflection or jamming, further improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of the present invention in a ventilation state;

[0032] Figure 2 A schematic diagram of the structure of the present invention in a non-ventilated state;

[0033] Figure 3 is the relationship between the reset force and the displacement from the valve disc to the valve seat;

[0034] Figure 4 A diagram showing the force variation of the valve disc during the opening process of the present invention;

[0035] Figure 5 is the relationship between the valve disc opening and the fluid medium force;

[0036] Figure 6 It is a schematic diagram of the structure of the present invention when it is in an open state;

[0037] Figure 7 It is a structural schematic diagram of the present invention in a reset state;

[0038] In the figure, 1 is the upper valve body, 11 is the outlet pipeline interface, 12 is the main fluid outlet channel, 13 is the first thread, 14 is the first metal hard sealing surface, 15 is the spherical groove, 16 is the branch channel, 2 is the lower valve body, 21 is the fluid inlet, 22 is the second thread, 23 is the second metal hard sealing surface, 3 is the spherical valve disc, 4 is the valve seat, 41 is the third metal hard sealing surface, 42 is the mounting hole, 5 is the filter screen, 6 is the O-ring, S is the displacement between the valve disc and the valve seat, F 介 F is the medium force on the spherical valve disc, 复位 is the restoring force on the spherical valve disc, S max is the maximum displacement of the spherical valve disc. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0040] Example

[0041] A hydrogenation port, such as Figure 1 and Figure 2 As shown, it includes a one-way valve and a filtering device, wherein the one-way valve includes a valve body with a valve cavity provided inside, a spherical valve disc 3 provided inside the valve cavity, and a valve seat 4 matched and sealed with the spherical valve disc 3; the valve body includes an upper valve body 1 provided with a fluid outlet and a lower valve body 2 provided with a fluid inlet 21, the upper valve body 1 and the lower valve body 2 are fastened together by a first thread 13, and the upper valve body 1 and the lower valve body 2 are sealed by a first metal hard sealing surface 14 provided on the end face of the upper valve body 1; the valve seat 4 is provided at the fluid inlet 21, and the upper valve body 1 is provided with a receiving groove for accommodating the spherical valve disc 3 at a position directly above the fluid inlet 21, and the receiving groove is a spherical groove 15 matching the shape of the spherical valve disc 3; the spherical valve disc 3 and the valve seat 4 are made of magnetic materials, the spherical valve disc 3 is reset by magnetic force and contacts and seals with the valve seat 4, specifically, the spherical valve disc 3 and the valve seat 4 are made of permanent magnet materials; the valve body is made of non-magnetic material, and can be selected as a material that will not be adsorbed by a magnet, such as austenitic stainless steel.

[0042] The fluid outlet of the upper valve body 1 includes a connected outlet pipe interface 11, a fluid outlet main channel 12, and a branch channel 16 connected to the side of the fluid outlet main channel 12; the branch channel 16 is connected to the valve cavity. In addition, there are two branch channels 16, which are symmetrically arranged on both sides of the fluid outlet main channel 12; the accommodating groove is located between the two branch channels 16.

[0043] The valve seat 4 is first installed on the lower valve body 2 through the second thread 22, and the valve seat 4 is provided with a mounting hole 42, and the fastener passes through the mounting hole 42 to fasten the valve seat 4 and the lower valve body 2 to complete the assembly of the two; the lower valve body 2 is provided with a second metal hard sealing surface 23, and the second metal hard sealing surface 23 is sealed and connected with the lower end surface of the valve seat 4, so that an effective seal is achieved between the lower valve body 2 and the valve seat 4. The contact portion between the valve seat 4 and the spherical valve disc 3 is provided with a third metal hard sealing surface 41, and the third metal hard sealing surface 41 is sealed and connected with the spherical valve disc 3, so as to achieve an effective seal between the valve seat 4 and the spherical valve disc 3. In this embodiment, the outlet pipeline interface 11 on the upper valve body 1 and the fluid inlet 21 on the lower valve body 2 are standard internal thread interfaces that comply with SAE J1926-1 and can be connected to external pipelines.

[0044] The filter device is installed at the fluid inlet (21), and the fluid inlet (21) includes a connecting section connected to an external pipeline and a fluid inlet channel connected to the valve chamber; the filter device includes an O-ring arranged on the connecting section and a filter screen arranged at the end of the fluid inlet channel, wherein the O-ring contacts and seals with the external pipeline, and the filter screen is a spherical filter screen protruding toward the connecting section of the fluid inlet 21.

[0045] The use process of the hydrogenation port in this embodiment is as follows:

[0046] like Figure 1 As shown, during hydrogenation, the gas flows from the fluid inlet 21 of the lower valve body 2 to the fluid outlet of the upper valve body 1. The force of the airflow will separate the spherical valve flap 3 and the valve seat 4, open the fluid inlet channel, and the spherical valve flap 3 will fall into the spherical groove 4, and will not be blown to other positions of the cavity by the airflow. The airflow passes through the branch channel 16 and the fluid outlet main channel 12, and then flows out from the outlet pipe interface 11;

[0047] like Figure 2 As shown, when hydrogenation stops, that is, when there is no ventilation, the spherical valve flap 3 is reset under the mutual magnetic force between it and the valve seat 4, forming a seal at the third metal hard sealing surface 41, and effectively sealing under the action of the medium force.

[0048] Example 2

[0049] This embodiment is the working principle of the hydrogenation port of embodiment 1 to solve the reciprocating vibration of the valve disc.

[0050] like Figure 3 As shown in the figure, the characteristics of the magnetic field are: the larger the displacement distance S between the valve disc and the valve seat, that is, the farther the valve disc is from the magnetic field source, the weaker the magnetic field, F 复位 The smaller the F 复位 =F 磁In this hydrogenation port, when the valve disc contacts the valve seat, the valve disc is subjected to the strongest suction force generated by the magnetic field strength of the valve seat; when the valve disc leaves the valve seat, as the opening height increases, the suction force on the valve disc continues to weaken, that is, the force (F 介 ) is the maximum force F required to open the magnetic valve flap 磁max When the spherical valve disc is opened, the F 磁 The magnetic valve disc will be fully opened, and because the spherical valve disc is at the maximum displacement S of the spherical valve disc, max At this time, the magnetic force is F 磁min , as long as F 介 Not less than F 磁min , the spherical valve disc is kept in the open state, such as Figure 6 As shown; when F 介 Less than F 磁min When the ball valve disc falls back to the closed state, Figure 7 As shown, therefore, for the hydrogenation port of the present invention, there are only two states: fully open or fully closed, and once the spherical valve flap is opened, the restoring force F 复位 will be greatly reduced. At this time, even if F 介 The smaller the size, the smaller the valve disc will not fall back. Figure 5 As shown in the figure, once the magnetic spherical valve disc is opened, the displacement S between the valve disc and the valve seat instantly rises to the maximum, completing the opening state. After that, the displacement of the spherical valve disc is proportional to F 介 It doesn't matter. It effectively avoids the vibration of the valve disc when the flow rate fluctuates or is small.

[0051] like Figure 4 As shown, when the medium force F 介初 Less than F 磁初 When the opening condition is not met, the valve remains closed. 介初 Greater than F 磁初 (i.e. 3N), the opening condition is met and the valve opens. As the distance between the spherical valve disc and the valve seat increases, the force between the two decreases. When the spherical valve disc is located in the spherical groove of the upper valve body, the magnetic force between the two is F 磁min (0.5N), at this time, even if F 介 As long as the F 介 Greater than F 磁min (0.5N), the spherical valve discs are stable in the spherical grooves and will not fall.

[0052] For example, assuming that 1 MPa can push the spherical valve disc open, and when the valve disc is fully open, F is required. 介It can only reset when the pressure is less than 0.5MPa, so it will not reset even if the pressure drops to 0.5MPa. This can avoid the vibration problem when the valve disc opening is relatively small under small flow conditions. When the airflow pressure is large, the spherical valve disc falls into the groove, and the valve disc will not reset due to the long distance and insufficient magnetic force. Until there is no airflow pressure, the spherical valve disc will automatically fall back to the valve seat and perform magnetic sealing.

[0053] In the prior art, at this time F 复位 =F 弹 , using elastic reset, the characteristics of the spring are F 弹 = kx, such as Figure 3 As shown, the spring force and deformation are proportional, that is, the more compression, the greater the rebound force. In the hydrogen filling port, when the valve disc contacts the valve seat, the valve disc is subjected to the minimum spring force of the spring to make it seal. When the valve disc leaves the valve seat, as the opening height increases, the spring force on the valve disc becomes larger and larger (F↑=kx↑). When the medium force (F 介 )>Valve disc initial force (F 弹初 ), the one-way valve opens. Once the one-way valve opens, a stroke is generated, and the distance between the valve disc and the valve seat is greater than the initial distance when the valve disc is closed. Medium force (F 介 )>Valve disc initial force (F 弹初 )<Spring force after valve disc opens (F 弹 ), so once the valve disc meets the opening conditions, the force on the valve disc is in an unbalanced state, and the force of the medium and the spring force are in a seesaw state. Figure 5 As shown, tremors may occur.

[0054] A comparison of magnetic and elastic reduction is summarized in Table 1.

[0055] Table 1 Comparison of magnetic reset and magnetic reset

[0056]

[0057] Note: F 介 is the medium force on the spherical valve disc, F 介初 is the initial force of the medium force to open the valve disc, F 弹初 is the elastic force received by the spherical valve disc in the initial state, F 弹 is the elastic force on the spherical valve disc in the open state, F 磁初 is the magnetic force received by the spherical valve disc in the initial state, F 磁max is the magnetic force received by the spherical valve disc in the initial state, F 磁min It is the magnetic force on the spherical valve disc when it is open.

[0058] Therefore, the hydrogenation port in the present embodiment 1 has a magnetic valve flap that can improve the vibration, and adopts magnetic reset instead of the traditional spring mechanism reset, without any negative effects of the spring, with high life and reliability, and the entire hydrogenation port has a simple structure, a small number of parts (only 6), strong manufacturability and high reliability; the hydrogenation port does not use any non-metallic seals, has excellent medium applicability, temperature applicability, and service life, and does not require any daily maintenance (non-metallic seals have extremely high requirements for the medium and temperature, and are consumables and will age); there is no spring and guide mechanism inside the valve cavity, the medium flow is more stable, and the pressure and flow loss are extremely small. The spherical valve flap has excellent guidance, can automatically sit in the center, and will not have deflection, jamming, etc., further improving the product reliability. The hydrogenation port is used for FCV, which effectively solves the problem of valve flap vibration, and can be used in hydrogen fuel cell vehicles, instruments, chemicals, automobiles, semiconductors and other fields.

[0059] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A hydrogenation port, comprising a one-way valve and a filtering device, characterized in that: The one-way valve comprises a valve body with a valve cavity provided therein, a spherical valve flap (3) provided inside the valve cavity, and a valve seat (4) matched with the spherical valve flap (3) and sealingly connected thereto; The valve body comprises an upper valve body (1) provided with a fluid outlet and a lower valve body (2) provided with a fluid inlet (21); the valve seat (4) is provided at the fluid inlet (21); the upper valve body (1) and the lower valve body (2) are fixedly connected by threads, and the upper valve body (1) and the lower valve body (2) are sealed by a first metal hard sealing surface (14) provided on the end surface of the upper valve body (1); the lower valve body (2) is provided with a second metal hard sealing surface (23), and the second metal hard sealing surface (23) is sealedly connected to the lower end surface of the valve seat (4); The upper valve body (1) is provided with a receiving groove for receiving the spherical valve flap (3) at a position directly above the fluid inlet (21); a third metal hard sealing surface (41) is provided at a contact portion between the valve seat (4) and the spherical valve flap (3), and the third metal hard sealing surface (41) is sealedly connected to the spherical valve flap (3); the spherical valve flap (3) and the valve seat (4) are made of magnetic materials, and the spherical valve flap (3) is reset by magnetic force and contacts and seals with the valve seat (4); The filtering device is installed at the fluid inlet (21).

2. A hydrogenation port according to claim 1, characterized in that: The spherical valve flap (3) and the valve seat (4) are made of permanent magnet material; and the valve body is made of non-magnetic material that cannot be attracted by magnetism.

3. A hydrogenation port according to claim 1, characterized in that: The accommodating groove is a spherical groove (15) that matches the shape of the spherical valve flap (3).

4. A hydrogenation port according to claim 1, characterized in that: The fluid outlet comprises a connected outlet pipe interface (11), a fluid outlet main channel (12), and a branch channel (16) connected to the side of the fluid outlet main channel (12), wherein the branch channel (16) is connected to the valve cavity; a threaded external pipe is provided inside the outlet pipe interface (11).

5. A hydrogenation port according to claim 4, characterized in that: The branch channels (16) are provided with two, symmetrically arranged on both sides of the fluid outlet main channel (12); the accommodating groove is located between the two branch channels (16).

6. A hydrogenation port according to claim 1, characterized in that: The fluid inlet (21) comprises a connection section connected to an external pipeline and a fluid inlet channel connected to the valve chamber; the filtering device comprises an O-ring arranged on the connection section and a filter screen arranged on the end of the fluid inlet channel; the O-ring contacts and seals with the external pipeline.

7. A hydrogenation port according to claim 6, characterized in that: The filter screen is a spherical filter screen with a connection section protruding toward the fluid inlet (21).

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