CN114702331A

CN114702331A - Ceramic sintered part, preparation method and bottle mouth valve assembly

Info

Publication number: CN114702331A
Application number: CN202210483609.3A
Authority: CN
Inventors: 刁延飞; 申铁柱; 邱捷
Original assignee: Changzhou Hengli Pneumatic Technology Co ltd
Current assignee: Changzhou Hengli Pneumatic Technology Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-07-05
Anticipated expiration: 2042-05-06
Also published as: CN114702331B

Abstract

The disclosure relates to the technical field of bottle mouth valves, in particular to a ceramic sintered part, a preparation method and a bottle mouth valve component, wherein the ceramic sintered part comprises: the ceramic shell is cylindrical and is arranged by opening along the two axial ends of the ceramic shell; the ceramic piece is packaged in the ceramic shell, and two ends of the ceramic shell are sealed; the PIN needle penetrates through the ceramic piece along the axial direction of the ceramic shell and is fixed; wherein, PIN needle is electrically conductive material, and the ceramic part is fixed in the ceramic housing through sintering fixed seal, and PIN needle is sealed through the secondary sintering and is fixed in the ceramic part. This is openly through adopting ceramic housing to through the structural style of secondary sintering fixed PIN needle in ceramic housing, compare with relevant technique, the hardness of ceramic material is higher, and wear-resisting corrosion-resistant high temperature resistance can be stronger, above-mentioned simple structure moreover, and convenient processing cost is low, and the ceramic member can not produce hydrogen embrittlement in the hydrogen cylinder moreover, has improved the life of sintered part.

Description

Ceramic sintered part, preparation method and bottle mouth valve assembly

Technical Field

The disclosure relates to the technical field of bottle mouth valves, in particular to a ceramic sintered part, a preparation method and a bottle mouth valve assembly.

Background

The bottleneck valve is used as a key part of the high-pressure hydrogen storage bottle, has highly centralized functions, comprises pressure reduction and stabilization, high reliable sealing performance, real-time temperature and pressure monitoring, quick hydrogenation, automatic and manual pressure relief and the like, and is generally internally provided with a switch electromagnet and an NTC temperature probe in the high-pressure hydrogen bottle, so that a conductive PIN needle connected with the switch electromagnet and the NTC temperature probe is required to be internally arranged in the bottleneck valve;

in the related technology known by the inventor, the PIN is mostly fixed by adopting a plastic packaging mode to realize insulation and sealing of a fixed part, however, the inventor finds that the plastic packaging mode has poor durability, is easy to damage and has a short service life;

the information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

In view of at least one of the above technical problems, the present disclosure provides a ceramic sintered part, a preparation method and a bottle mouth valve assembly, which adopt a ceramic sintering process to realize ceramic packaging of a PIN so as to improve reliability and stability of use of the PIN.

According to a first aspect of the present disclosure, there is provided a ceramic sintered piece comprising:

the ceramic shell is cylindrical and is arranged by opening along the two axial ends of the ceramic shell;

the ceramic piece is packaged in the ceramic shell, and two ends of the ceramic shell are sealed;

the PIN needle penetrates through the ceramic piece along the axial direction of the ceramic shell and is fixed;

the PIN needle is made of a conductive material, the ceramic part is fixed in the ceramic shell through sintering, fixing and sealing, and the PIN needle is fixed in the ceramic part through secondary sintering and sealing.

In some embodiments of the present disclosure, the ceramic piece material conforms to the coefficient of expansion of the PIN material.

In some embodiments of the present disclosure, the PIN is formed by sintering in a low-temperature sintering or reducing atmosphere furnace.

According to a second aspect of the present disclosure, there is provided a method for producing a ceramic sintered part according to any one of the first aspect, comprising the steps of:

preparing a ceramic shell;

sintering and molding a ceramic piece in the ceramic shell, and reserving hole sites;

and (3) penetrating the PIN needle into the reserved hole position, and performing secondary sintering to realize the packaging of the PIN needle in the ceramic piece.

In some embodiments of the present disclosure, the second sintering is performed by using low-temperature sintering or reducing atmosphere sintering.

In some embodiments of the present disclosure, the expansion coefficient of the ceramic material is consistent with the expansion coefficient of the PIN material when the second sintering is performed.

According to a third aspect of the present disclosure, there is provided a finish valve assembly comprising:

the valve body is connected with the gas storage bottle in a sealing mode and provided with a first channel communicated with the interior of the gas storage bottle;

the ceramic sintered part according to any of the first aspect, which is fixed in the first passage with a seal between the ceramic sintered part and the first passage, the seal being used for sealing between the ceramic sintered part and the first passage;

and the connecting wire is fixed on the first channel on the valve body and is connected with the PIN needle on the ceramic sintered part, and the other end of the PIN needle is connected with an internal electronic element.

In some embodiments of the present disclosure, the PIN connector further comprises a sheath tube connected to the first channel, the sheath tube having a temperature probe therein, the temperature probe being electrically connected to the PIN.

In some embodiments of the present disclosure, the valve body further has a second passage communicating with the inside of the gas cylinder, the valve body further has a gas outlet communicating with the second passage, the gas outlet communicates with the outside, the second passage has a safety valve assembly therein, and the safety valve assembly includes:

the rubber cushion is used for sealing the second channel and the exhaust port;

the valve core is movably arranged in the second channel, and the bottom of the valve core is connected with the rubber pad;

the first spring is sleeved on the valve core, and one end of the first spring is connected with the valve core;

the valve seat is sleeved on the valve core and movably arranged along the direction of the first channel, and the valve seat is connected with the other end of the first spring;

the fusible alloy is poured on the valve seat for molding;

the valve cover is fixed on the valve body;

the fusible alloy is melted after reaching a set temperature, the valve seat moves towards the valve cover under the action of the first spring, the valve core rises under the action of pressure, the safety valve is opened, and gas is exhausted from the exhaust port through the second channel.

In some embodiments of the present disclosure, the valve body further has thereon a third passageway, a manual valve, and a solenoid assembly, wherein:

the valve body is also provided with an air outlet communicated with the third channel, and the air outlet is communicated with the outside;

the manual valve comprises a sealing gasket for blocking the third channel from the air outlet and an adjusting screw rod connected with the sealing gasket, and the air outlet is opened when the adjusting screw rod is rotated;

the electromagnet assembly includes:

the shell is hermetically connected with a third channel inlet at the bottom of the valve body, an air inlet channel communicated with the third channel is arranged in the shell, and an air inlet communicated with the air inlet channel is also arranged on the shell;

the movable iron core is movably arranged in the air inlet channel, when the movable iron core moves to a position away from the air inlet, the air inlet is communicated with the third channel, and when the movable iron core moves to a position covering the air inlet, the air inlet and the third channel are blocked;

the static iron core is fixed at the bottom in the shell and is opposite to the movable iron core;

the second spring is arranged between the movable iron core and the static iron core;

the coil is arranged around the static iron core and the movable iron core and is connected with the PIN needle;

when the coil is electrified, the movable iron core is close to the static iron core under the action of magnetic attraction force so as to realize the communication between the air inlet and the third channel, and when the coil is powered off, the movable iron core resets under the action of the second spring.

The beneficial effect of this disclosure does: this is openly through adopting ceramic housing to through the structural style of secondary sintering fixed PIN needle in ceramic housing, compare with relevant technique, the hardness of ceramic material is higher, and wear-resisting corrosion-resistant high temperature resistance can be stronger, above-mentioned simple structure moreover, and convenient processing cost is low, and the ceramic member can not produce hydrogen embrittlement in the hydrogen cylinder moreover, has improved the life of sintered part.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure 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 described in the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of a ceramic sintered part according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a ceramic sintered part in an embodiment of the disclosure;

FIG. 3 is a front view of a ceramic part in an embodiment of the disclosure;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 in an embodiment of the present disclosure;

FIG. 5 is a flow chart of a method of making a ceramic sintered part according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural view of a finish valve assembly in an embodiment of the present disclosure;

FIG. 7 is a cross-sectional view of a finish valve assembly in an embodiment of the present disclosure;

FIG. 8 is an enlarged view of a portion of FIG. 7 at B in an embodiment of the disclosure;

FIG. 9 is a cross-sectional view of the valve body at the relief valve in an embodiment of the disclosure;

FIG. 10 is a schematic view of a relief valve according to an embodiment of the disclosure;

FIG. 11 is a cross-sectional view at the manual valve in an embodiment of the disclosure;

FIG. 12 is a schematic cross-sectional structural view of an electromagnet assembly in an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" 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," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the embodiment of the disclosure, the inventor finds that the thermal expansion coefficient of the plastic package is not matched with the PIN, which causes the generation of internal stress, so that the plastic package deforms at high temperature, and the corrosion resistance and the stability are not enough; in order to solve the problems, the invention finds that hydrogen embrittlement is easy to cause and delayed fracture is caused under the action of stress if metal packaging is adopted; therefore, the inventor selects ceramic materials with higher hardness, wear resistance, corrosion resistance and high temperature resistance than metals, when the PIN needle is packaged by using ceramic materials, the surface of the ceramic is mostly metallized in the related technology, a common metallized layer is a molybdenum-manganese layer, and then the molybdenum-manganese layer and the metal are sintered together by silver-copper solder, however, the process difficulty is higher and the cost is higher; in the embodiment of the disclosure, the inventor adopts a ceramic packaging secondary sintering process, so that the process difficulty and the cost are reduced, and details of the sintered piece and a bottle mouth valve assembly applying the sintered piece are described in the following part of the disclosure; it should be noted that, in the embodiments of the present disclosure, a hydrogen cylinder is taken as an example, and is not considered as a specific limitation to the application environment of the ceramic sintered part in the present disclosure, and a person skilled in the art may still fall within the protection scope of the present disclosure when applying the above-mentioned structure to other gas cylinders or to other valve bodies based on the inventive concept;

the ceramic sintered part 100 as shown in fig. 1 to 3 comprises a ceramic housing 110, a ceramic part 120 and a PIN 130, wherein:

the ceramic shell 110 is a general standard component, and in the embodiment of the present disclosure, the ceramic shell 110 is manufactured in batch, as shown in fig. 1, the ceramic shell 110 is in a cylindrical shape, and two ends of the ceramic shell 110 in the axial direction are arranged to be open; during manufacturing, a sealing groove is formed in the surface of the ceramic shell 110, and is used for sealing and mounting the ceramic shell 110 in a mounting environment, and the surface of the sealing groove needs to be smooth and flat;

the ceramic piece 120 is packaged inside the ceramic shell 110, and both ends of the ceramic shell 110 are sealed, in the embodiment of the disclosure, the ceramic piece 120 is formed in the ceramic shell 110 by sintering, in the specific manufacturing process, powder can be added into the ceramic shell 110 through a die to form a fixed shape, then the powder shrinks after being heated to a certain temperature by sintering, and becomes a compact and hard sintered body at a temperature lower than the melting point of a substance; in the embodiment of the present disclosure, after the ceramic part 120 is sintered and molded in the ceramic housing 110, the PIN is fixed by penetrating through the ceramic part 120 in the axial direction of the ceramic housing 110 in a secondary sintering manner; specifically, during the process of sintering the ceramic body, a hole is reserved firstly, then the PIN 130 penetrates through the reserved hole, the PIN 130 and the hole are filled in by a glass powder melting mode, and then secondary sintering is performed, so that the PIN 130 and the ceramic piece 120 are fixed finally;

in the embodiment of the present disclosure, the PIN 130 is made of a conductive material, and is used for communication of an electrical signal, and in the embodiment of the present disclosure, the PIN 130 may be a temperature probe 410 or an electromagnetic coil 750 and other electronic components fixed inside the bottleneck valve, so that after the PIN 130 is connected to the internal temperature probe 410 or the electromagnetic coil 750, the PIN can perform related power-on and power-off actions and output corresponding temperature parameter values according to the requirements of the controller; through the arrangement of the mode, on one hand, the structure is simple, the processing difficulty is low, and compared with plastic package, the use durability is greatly enhanced;

in the above embodiment, by adopting the ceramic housing 110 and fixing the PIN 130 in the ceramic housing 110 by secondary sintering, the hardness of the ceramic material is higher, and the wear-resistant, corrosion-resistant and high-temperature-resistant properties are stronger, and the above structure is simple, and the processing cost is low, and the ceramic piece 120 does not generate hydrogen embrittlement in the hydrogen cylinder, thereby improving the service life of the sintered piece.

In the embodiment of the present disclosure, one of the most important properties of the ceramic sintered part 100 is its gas tightness, because it is required to isolate the hydrogen inside the gas cylinder from the outside air to ensure that the gas cylinder has no leakage, and the pressure of the hydrogen cylinder is generally high, for example, the standard nominal pressure of the hydrogen cylinder usually equipped in a passenger car is 70MPa, the standard nominal pressure of the hydrogen cylinder equipped in a truck or a bus is 35MPa, and the normal operating pressure of the hydrogen fuel cell system is usually less than 1MPa, so the requirement for gas tightness is very high, in the embodiment of the present disclosure, in order to ensure the sealing performance of the sintered part, the material of the ceramic part 120 is required to be consistent with the expansion coefficient of the PIN 130 material during the specific sintering, and because the sintering with the consistent expansion coefficient is performed, the problem of gap cracking and the like caused by the inconsistent expansion coefficients of the PIN 130 and the ceramic part 120 after the heating in the later period can be reduced, thereby fundamentally improving the service durability of the sintered part; in the embodiment of the disclosure, the PIN 130 is made of 304 steel, the expansion coefficient is 115-118, the mixed material adopted by the ceramic piece 120 mainly comprises boron-SI-AL-ZN zinc-Li lithium, and the like, and the expansion coefficient of the mixed material is consistent with that of the PIN 130 by adjusting the mixing proportion of the mixed material; finally, the technical effect that the pressure of a ventilation test of the formed sintered part is 350 kg without leakage is achieved;

in the embodiment of the present disclosure, in order to not affect the originally molded ceramic piece 120, when the PIN 130 is encapsulated, the molding is performed by using a low-temperature or reducing atmosphere furnace sintering method, specifically, the low-temperature sintering temperature in the embodiment of the present disclosure is in the range of 850-; the reducing atmosphere furnace is used for controlling reducing atmosphere in a kiln way from the temperature of more than 500 ℃ to the fire stopping temperature; in the embodiment of the present disclosure, the atmosphere concentration and the atmosphere profile are adjusted according to the kind of the fired ceramic, so that the PIN 130 and the ceramic piece 120 are sintered together.

In an embodiment of the present disclosure, a method for preparing the sintered body of the ceramic part 120 is further provided, as shown in fig. 5, including the following steps:

s10: preparing a ceramic shell 110; it should also be noted that in the disclosed embodiment, the ceramic housing 110 is relatively simple to manufacture and can be manufactured in a batch process; specifically, the mixed material is sintered through a die;

s20: sintering the formed ceramic piece 120 in the ceramic shell 110, and reserving hole sites; in the embodiment of the present disclosure, the ceramic part 120 is formed by first extruding the ceramic part into a stable form through a mold in the ceramic housing 110, and then sintering the stable form, and during the specific sintering process, there are many ways of forming pores, such as additive pore-forming method, organic foam impregnation method, and foaming process, etc., as shown in fig. 3 and 4, which are schematic structural diagrams of the formed ceramic part 120;

s30: and (4) penetrating the PIN PIN 130 into the reserved hole, and performing second sintering to realize the packaging of the PIN PIN 130 in the ceramic piece 120. It should be noted that, in the embodiment of the present disclosure, when performing the secondary sintering, the mixed material is used to fill the gap between the PIN 130 and the reserved hole, and the PIN 130 and the ceramic piece 120 are fused and combined together by the secondary sintering, and after the molding, a pressure test is performed to ensure the sealing and pressure-resistant performance.

In addition to the above embodiments, low temperature sintering or reducing atmosphere sintering is used for sintering the PIN 130 and the ceramic piece 120, and in order to ensure the durability of the sintered piece, in the embodiment of the present disclosure, the expansion coefficient of the material of the ceramic piece 120 is consistent with the expansion coefficient of the material of the PIN 130 during the second sintering. The details of this part have already been described in the above description of the sintered part structure, and those skilled in the art can understand the above description, and will not be described here.

In the disclosed embodiment, the application of the above-mentioned ceramic sintered part 100 is also exemplarily described, such as the mouthpiece valve assembly shown in fig. 6 to 8, which includes a valve body 200, the ceramic sintered part 100 and a connecting line 300, wherein:

as shown in fig. 6, in the disclosed embodiment, the valve body 200 is hermetically connected with the gas cylinder, the valve body 200 having a first passage 210 communicating with the inside of the gas cylinder; in the embodiment of the present disclosure, the sealing connection between the valve body 200 and the gas cylinder is realized by a thread fit and a sealing ring, and in other embodiments of the present disclosure, the sealing connection between the valve body 200 and the gas cylinder may be realized by a sealing member 211 and a fastening member; the first channel 210 is used for communicating the PIN 130 of the ceramic sintered part 100 with the outside, and when the ceramic sintered part 100 is specifically connected, the connecting line 300 may first pass through the first channel 210, then be connected with the PIN 130 in a crimping manner, and then fix the ceramic sintered part 100 in the first channel 210 together, in the embodiment of the present disclosure, in order to improve the reliability of fixing the ceramic sintered part 100, the first channel 210 adopts a step-type structure; the ceramic sintered part 100 is the ceramic sintered part 100 described above, and as shown in fig. 7 and 8 in particular, the ceramic sintered part 100 is fixed in the first passage 210, and a sealing member 211 is provided between the ceramic sintered part 100 and the first passage 210, and the sealing member 211 is used for sealing between the ceramic sintered part 100 and the first passage 210; in the disclosed embodiment, the seal 211 is an O-ring seal 211 or a flat ring structure that fits into a seal groove on the ceramic housing 110, or both are disposed in the seal groove as shown in fig. 8; through the arrangement of the structure, the air tightness and the compressive strength of the ceramic sintered part 100 meet the requirements, so that the first channel 210 is sealed by using the sealing element 211, hydrogen is prevented from leaking through the first channel 210, the installation and fixation form not only saves the external space occupation, but also improves the sealing performance and the integral durability, the corrosion resistance and the high temperature resistance of the ceramic sintered part 100;

with continued reference to fig. 6, in the embodiment of the present disclosure, the connection line 300 is fixed on the first channel 210 on the valve body 200 and connected with the PIN 130 on the ceramic sintered part 100, and in the embodiment of the present disclosure, the other end of the connection line 300 is a desz plug for connecting with a controller; it should be noted that, in the embodiment of the present disclosure, the other end of the PIN 130 is connected to an internal electronic component, where the internal electronic component is not limited to the temperature probe 410 or the coil 750, but may be another sensor or probe; in order to ensure the connection reliability, in the embodiment of the present disclosure, one end of the inside of the PIN is fixedly connected to the temperature probe 410 by welding;

in the embodiment of the present disclosure, since the temperature inside the hydrogen cylinder needs to be monitored, the temperature probe 410 needs to be provided, and now a fixing manner of the temperature probe 410 is described in detail, as shown in fig. 9, in the embodiment of the present disclosure, a sheath tube 400 is further included, the sheath tube 400 is connected to the first channel 210, the temperature probe 410 is provided inside the sheath tube 400, and the temperature probe 410 is electrically connected to the PIN 130. It should be noted that, in the embodiment of the present disclosure, the PIN 130 is provided in plural numbers, and is respectively connected to the temperature probe 410 and the coil 750.

With respect to the valve body 200 in the disclosed embodiment, both types of the safety valve assembly 500 and the manual valve 600 are included, as described in detail below;

as shown in fig. 9 and 10, in some embodiments of the present disclosure, the valve body 200 further has a second passage 220 communicating with the inside of the gas cylinder, the valve body 200 further has a gas outlet 220a communicating with the second passage 220, the gas outlet 220a communicates with the outside, the second passage 220 has a safety valve assembly 500 therein, and the safety valve assembly 500 includes:

a gasket 510 for sealing the second passage 220 with the exhaust port 220 a; as shown in fig. 9, the bottom of the rubber pad 510 contacts the top of the thinner portion of the second channel 220, so that the second channel 220 can be closed when the rubber pad 510 is subjected to a downward pressure;

a valve core 520 movably disposed in the second passage 220, the bottom of which is connected to the rubber pad 510; the connection here may be that as shown in fig. 9, a groove for accommodating the rubber pad 510 is opened at the bottom of the valve core 520;

a first spring 530, which is sleeved on the valve core 520 and one end of which is connected with the valve core 520; here, the first spring 530 may be a disc spring;

a valve seat 540 sleeved on the valve core 520 and movably arranged along the direction of the first channel 210, wherein the valve seat 540 is connected with the other end of the first spring 530;

the fusible alloy 550 is poured on the valve seat 540 for molding; the fusible alloy 550 is made of bismuth tin alloy in the embodiment of the disclosure, the melting point of the bismuth tin alloy is 110 ℃, and when the temperature of the valve body 200 reaches 110 ℃, the fusible alloy 550 is melted, so that the valve core 520 moves, and the safety valve is opened;

a valve cover 560 fixed to the valve body 200; in the disclosed embodiment, as shown in fig. 10, an acoustic elimination sheet is further provided between the fusible alloy 550 and the valve cover 560, and hole sites are provided thereon to reduce noise when the safety valve is opened;

the fusible alloy 550 melts after reaching a set temperature, the valve seat 540 moves toward the valve cover 560 by the first spring 530, the valve element 520 rises by pressure, the safety valve opens, and the gas is exhausted through the second passage 220 through the exhaust port 220 a.

In the above embodiment, by the arrangement of the safety valve, the gas can be automatically discharged under the high temperature condition, so as to improve the safety of the hydrogen cylinder; it should be noted that in other embodiments of the present disclosure, the gas in the gas cylinder includes, besides hydrogen, natural gas and other gases;

with respect to the manual valve 600, as shown in fig. 11 and 12, in the embodiment of the present disclosure, the valve body 200 further has thereon a third channel 230, the manual valve 600, and a solenoid assembly 700, wherein:

the valve body 200 is also provided with an air outlet 230a communicated with the third channel 230, and the air outlet 230a is communicated with the outside;

the manual valve 600 includes a packing 610 for blocking the third passage 230 from the air outlet 230a, and an adjusting screw 620 connected to the packing 610, and the air outlet 230a is opened when the adjusting screw 620 is rotated; in the embodiment of the present disclosure, by rotating the adjusting lever, the position of the bottom of the adjusting lever may be raised, thereby ventilating the sealing gasket 610 for blocking the third channel 230 and the air outlet 230 a;

in the disclosed embodiment, to further improve the safety of the manual valve 600, the solenoid assembly 700 is used to open and close the air passage inside, as shown in fig. 12,

the electromagnet assembly 700 includes:

the housing 710 is hermetically connected with the inlet of the third channel 230 at the bottom of the valve body 200, an air inlet channel communicated with the third channel 230 is arranged in the housing 710, and an air inlet 710a communicated with the air inlet channel is also arranged on the housing 710;

the movable iron core 720 is movably arranged in the air inlet channel, when the movable iron core 720 is moved to a position away from the air inlet 710a, the air inlet 710a is communicated with the third channel 230, and when the movable iron core 720 is moved to a position covering the air inlet 710a, the air inlet 710a is blocked from the third channel 230;

a stationary core 730 fixed to the bottom of the housing 710 and disposed opposite to the movable core 720;

a second spring 740 disposed between the movable core 720 and the stationary core 730;

a coil 750 disposed around the stationary core 730 and the movable core 720, the coil 750 being connected to the PIN 130;

when the coil 750 is powered on, the movable iron core 720 is close to the stationary iron core 730 under the action of the magnetic attraction force to realize the communication between the air inlet 710a and the third channel 230, and when the coil 750 is powered off, the movable iron core 720 is reset under the action of the second spring 740.

Through the arrangement, when the coil 750 is electrified and attracted, the air path is communicated, and then the flow is further adjusted through the rotation of the adjusting rod.

It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, which are presented solely for purposes of illustrating the principles of the disclosure, and that various changes and modifications may be made to the disclosure without departing from the spirit and scope of the disclosure, which is intended to be covered by the claims. The scope of the disclosure is defined by the appended claims and equivalents thereof.

Claims

1. A ceramic sintered article, comprising:

the PIN needle is made of a conductive material, the ceramic part is fixed in the ceramic shell in a sintering and fixing manner, and the PIN needle is fixed in the ceramic part in a secondary sintering and sealing manner.

2. Ceramic sintered part according to claim 1, characterized in that the material of the ceramic part corresponds to the expansion coefficient of the PIN material.

3. The ceramic sintered part according to claim 2, wherein the PIN needle is sintered and formed by low-temperature sintering or a reducing atmosphere furnace.

4. A method for producing a ceramic sintered article according to any one of claims 1 to 3, comprising the steps of:

preparing a ceramic shell;

5. The method according to claim 4, wherein the second sintering is performed by low-temperature sintering or sintering in a reducing atmosphere.

6. The method according to claim 5, wherein the expansion coefficient of the ceramic material is consistent with that of the PIN material during the second sintering.

7. A finish valve assembly, comprising:

the valve body is hermetically connected with the gas storage cylinder and is provided with a first channel communicated with the interior of the gas storage cylinder;

the ceramic sintered part as claimed in any one of claims 1 to 3, being fixed in said first passage with a seal between said ceramic sintered part and said first passage, said seal being used for sealing between said ceramic sintered part and said first passage;

8. The finish valve assembly of claim 7, further comprising a shield tube connected to the first passage, the shield tube having a temperature probe therein, the temperature probe being electrically connected to the PIN.

9. The finish valve assembly of claim 8, further comprising a second passageway in the valve body in communication with the interior of the cylinder, a vent port in communication with the second passageway, the vent port in communication with the exterior, and a relief valve assembly in the second passageway, the relief valve assembly comprising:

the rubber cushion is used for sealing the second channel and the exhaust port;

the fusible alloy is poured on the valve seat for molding;

the valve cover is fixed on the valve body;

10. The finish valve assembly of claim 7, further comprising a third passageway, a manual valve, and a solenoid assembly on the valve body, wherein:

the electromagnet assembly includes: