Gas instrument three-way connector with check port

Abstract

A gas instrument three-way connector with a checking opening comprises a three-way seat, a gas inlet is formed in the lower end of the three-way seat, and a gas outlet used for installing and connecting an instrument is formed in the upper end of the three-way seat. The side end of the three-way seat is provided with a verification port, the verification port and the air outlet are communicated through a first channel in the three-way seat, the verification port and the air inlet are communicated through a second channel in the three-way seat, the first channel and the second channel are not communicated, and the verification port is fixedly provided with a one-way valve assembly which only allows air flow to be introduced into the internal channel; the interior of the one-way valve assembly communicates with the first channel and the second channel, when the calibration connector is connected, the one-way valve allows air inflow, the interior of the one-way valve assembly and the second channel are blocked, and the one-way valve assembly communicates with the first channel. The gas meter calibration device is reliable in sealing, free of gas leakage, compact in structure and small in size, effectively solves the problem that field installation of the meter is limited by space, and is suitable for being applied to gas meter calibration in narrow space or places with densely arranged pipelines.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of switchgear joint, specifically relates to a gas instrument tee joint with a check port. BACKGROUND

[0002] As an excellent insulating arc-extinguishing medium, sulfur hexafluoride gas is widely used in power grid systems, but its strong greenhouse effect will affect the ecological environment if discharged into the atmosphere, so strict management is required during the use of sulfur hexafluoride gas.

[0003] The sulfur hexafluoride gas in the sulfur hexafluoride switch circuit breaker device is the focus of the whole life cycle management of sulfur hexafluoride gas, and the accurate statistics of the in-service gas quantity is the basis of the in-service gas management. The sulfur hexafluoride density monitoring devices such as sulfur hexafluoride digital density relay and sulfur hexafluoride wireless density transmitter can collect the pressure and temperature of the sulfur hexafluoride gas in the gas chamber in real time, and realize the management of the inventory distribution and loss statistics of the in-service gas.

[0004] When the value of the sulfur hexafluoride wireless density transmitter is inaccurate, it needs to be calibrated in time. Since the sulfur hexafluoride wireless density transmitter is generally directly installed on the bypass of the airflow channel, when calibrating the sulfur hexafluoride wireless density transmitter, the airflow channel of the whole device needs to be closed to calibrate the sulfur hexafluoride wireless density transmitter, and the operation before calibration is complicated.

[0005] At present, the switchgear device generally adopts the structure of adding a tee stop valve to the ordinary tee joint, as shown in the attached drawing Figure 8 A stop valve 15 is added to one connecting port of the tee joint 13, and a pipeline connecting head 16 is further added to the stop valve 15 to facilitate connection to the sampling pipeline (or bypass). The interface of the tee joint 13 and the stop valve 15 cannot be directly connected, and a mating joint 14 needs to be added to realize connection. The interface for installing the instrument in the tee joint 13 needs to be connected to a union joint 11 to facilitate the installation of the instrument 8, so that the front of the dial is beneficial for the user to view. Similarly, the interface of the tee joint 13 and the union joint 11 also needs to be connected to a mating joint 12, and the interface for calibration in the tee joint 13 also needs to be connected to a calibration joint 18 through a mating joint 17. When the instrument such as the sulfur hexafluoride digital density relay and the sulfur hexafluoride wireless density transmitter is detected and calibrated, the detection and calibration can be realized by operating the tee stop valve 15. When the stop valve 15 is closed, the calibration interface of the tee joint 13 is connected to the calibration gas to realize calibration. When the calibration gas is removed from the calibration interface of the tee joint 13, the stop valve 15 is opened, and the instrument is detected.

[0006] From the above, the current tee joint plus tee stop valve structure, many components, large volume, so the site installation is limited by space is relatively large, not suitable for application in narrow space or dense pipeline arrangement place; many components, connection points, gas tightness check is easy to miss, prone to gas leakage.

[0007] The installation mode of the calibration of the gas instrument needs to be updated urgently. SUMMARY

[0008] In order to solve the problems of the existing gas instrument installation structure, such as easy leakage, site installation is limited by space is relatively large, not suitable for application in narrow space or dense pipeline arrangement place, the utility model provides a tee joint with calibration joint, which is reliable in sealing and compact in structure.

[0009] To solve the above technical problems, the utility model adopts the following technical scheme,

[0010] A tee joint with a verification port of a gas instrument, comprising a tee seat,

[0011] The lower end of the tee seat is provided with a gas inlet, and the upper end of the tee seat is provided with a gas outlet for installing a connected instrument, the outer wall of the gas inlet is provided with a mounting thread, and the gas outlet adopts a cylinder shell structure with a mounting thread on the outer wall;

[0012] The side end of the tee seat is provided with a verification port, the verification port and the gas outlet are communicated through a first channel in the tee seat, the verification port and the gas inlet are communicated through a second channel in the tee seat, the first channel and the second channel are not communicated, and a one-way valve assembly that only allows gas flow into the internal channel is fixedly installed on the verification port;

[0013] The one-way valve assembly, the internal part of the one-way valve assembly is respectively communicated with the first channel and the second channel, when the calibration joint is connected, the one-way valve allows gas to enter, and the internal part of the one-way valve assembly is blocked with the second channel and communicated with the first channel.

[0014] Further, a positioning nut is further arranged on the outer wall thread of the gas outlet for installing a connected instrument.

[0015] Further, a protective cap for preventing dust and impurities from entering is arranged on the gas inlet end of the one-way valve assembly.

[0016] Further, the one-way valve assembly comprises a one-way valve shell, a valve core shaft, a valve core stop ring, an elastic retainer, and a compression spring.

[0017] The valve body channel is arranged in the internal part of the one-way valve shell, the left end of the one-way valve shell is provided with a joint for connecting an external calibration joint, and the right end surface of the one-way valve shell is sealingly connected with the verification port of the side end of the tee seat.

[0018] A valve core is slidably arranged in the valve body channel for opening and closing the passage of the gas flow into the interior, the valve core comprises a valve core shaft, the left end of the valve core shaft is a valve core top, the middle part of the valve core shaft is provided with a shaft shoulder, and the right end of the valve core shaft is provided with a valve core taper head.

[0019] A limiting valve core stop ring and a fixedly positioned elastic stop ring are sequentially inserted and arranged on the valve core shaft left to the shaft shoulder, a stop ring groove for installing the elastic stop ring is formed in the inner side wall of the valve body channel, the part of the valve core shaft extending left to the elastic stop ring is the valve core top, an axial channel is formed in the valve core shaft left to the shaft shoulder, and a radial valve hole is also formed.

[0020] A compression spring is inserted and arranged on the valve core shaft right to the shaft shoulder, the right end surface of the compression spring is in abutting connection with the calibration port, and the valve core taper head right to the valve core shaft is in sliding sealing connection with the second hole of the second channel opening in the calibration port.

[0021] The valve core shaft right to the valve hole is in sealing connection with the valve core stop ring, the valve core stop ring is in sealing connection with the side wall of the valve body channel, and the valve core taper head is in sealing connection with the second hole of the second channel opening in the calibration port.

[0022] The gaps between the axial channel and the valve hole and between the shaft shoulder and the valve body channel, and the middle channel right to the shaft shoulder are in communication to form the gas flow channel of the one-way valve assembly.

[0023] Further, the left end of the valve core taper head is provided with a protruding part for limiting the contact part of the valve core shaft.

[0024] Further, the protruding part adopts the shaft shoulder mode.

[0025] Further, the calibration port formed in the side end of the three-way seat is a stepped hole with an outer large and inner small structure, the second hole of the second channel opening in the calibration port is formed in the bottom surface of the stepped hole, the first hole of the first channel opening in the calibration port is formed in the stepped surface, the center line of the valve core taper head coincides with the center line of the second hole, the valve core taper head is in sealing connection or disconnected with the second hole by sliding with the valve core shaft, for opening and closing the passage between the internal gas flow channel of the one-way valve assembly and the second channel, the right end outer side surface of the one-way valve shell is in sealing connection with the stepped side surface of the stepped hole, and the right end surface of the compression spring is in abutting connection with the bottom surface of the stepped hole.

[0026] The one-way valve shell is a left-right-through cylindrical structure, and the inside of the cylinder is the valve body channel.

[0027] Further, the sealing connection between the right end outer side surface of the one-way valve shell and the stepped hole side surface adopts welding sealing.

[0028] Further, the sealing connection between the right end outer side surface of the one-way valve shell and the stepped hole side surface adopts welding sealing.

[0029] When calibrating, the protective cap of the air inlet end of the check valve assembly is removed, and the outer thread of the air inlet end of the check valve assembly is connected with a matched external calibration joint. The top core in the calibration joint pushes the valve core top of the check valve assembly axially inward, the valve core moves rightward, the shaft shoulder moves rightward, the seal between the valve core shaft and the valve core blocking ring is gradually disengaged, the valve core taper moves rightward to block the second hole of the opening of the first channel in the inspection port, the calibration gas enters the valve body channel from the external calibration joint, flows through the axial channel, the valve hole, the gap between the valve core shaft and the valve core blocking ring, the gap between the shaft shoulder and the valve body channel, enters the intermediate channel, and then enters the first channel through the first hole of the opening of the first channel in the inspection port, and then enters the meter from the gas outlet, so that the calibration of the meter installed on the gas outlet is realized.

[0030] The positioning nut is arranged on the outer wall connecting thread of the gas outlet for installing the meter. Compared with the common threaded connection, the meter installed on the gas outlet can rotate around the central axis of the positioning nut, and the front surface of the meter dial is turned to a position favorable for the user to view by tightening the positioning nut. The positioning nut has the advantages of small structure, simple operation and low processing cost.

[0031] The three-way joint of the utility model is sealed reliably, and the installation and dismounting of the external calibration joint and the internal gas will not leak to the outside during the calibration process of the meter.

[0032] The three-way joint of the utility model has compact overall structure and small size, effectively solves the problem that the on-site installation of the meter is limited by space, and makes the connection of the pipeline simpler and saves the labor cost of the pipeline connection.

[0033] The utility model independently realizes the detection and calibration of the meter, and only needs to open the valve on the body to realize the detection when the meter is detected. When the meter is calibrated, only needs to connect the air inlet of the check valve assembly installed on the inspection port with the matched external calibration joint, so that the calibration of the meter is realized. The calibration is convenient and fast, and is safe and has no leakage.

[0034] In summary, the utility model realizes the function of the general joint of the switch device, effectively solves the problem that the on-site installation is limited by space, is sealed reliably and has no gas leakage, has compact and beautiful overall structure, and can be widely applied to places where the gas meter may be calibrated, such as petroleum, chemical industry, pharmacy, steel, gas storage station and special industrial plant. BRIEF DESCRIPTION OF DRAWINGS

[0035] The utility model will be further described below with reference to the drawings.

[0036] Figure 1 It is the overall structure diagram of the utility model;

[0037] Figure 2 It is the schematic diagram of the installation and connection of the utility model and the meter;

[0038] Figure 3 is a structural schematic diagram of the utility model;

[0039] Figure 4 is a structural schematic diagram of the internal components of the one-way valve assembly of the utility model;

[0040] Figure 5 is a detail view of the one-way valve assembly in the utility model;

[0041] Figure 6 is a schematic diagram of the gas path flow direction in the detection state of the utility model;

[0042] Figure 7 is a schematic diagram of the gas path flow direction in the calibration state of the utility model;

[0043] Figure 8 is a schematic diagram of the installation structure of the existing ordinary tee joint plus tee stop valve.

[0044] Figures 1-7 in the middle:

[0045] 1 - gas outlet, 2 - positioning nut;

[0046] 3 - tee seat, 310 - first channel, 311 - first hole, 312 - second hole, 313 - second channel;

[0047] 4 - gas inlet,

[0048] 5 - one-way valve assembly, 510 - one-way valve housing, 511 - joint, 512 - elastic retainer, 513 - valve hole, 514 - axial channel, 515 - valve body channel, 516 - valve core top head, 517 - valve core retainer ring, 518 - second sealing ring, 519 - valve core shaft, 520 - compression spring, 521 - intermediate channel, 522 - one-way valve housing positioning surface, 523 - valve core taper head, 524 - third sealing ring, 525 - protruding part, 526 - shaft shoulder, 527 - first sealing ring;

[0049] 6 - sealing surface, 7 - compression spring positioning surface, 8 - instrument.

[0050] Figure 8 in the middle, 10 - instrument adapter, 11 - union joint, 12 - union joint, 13 - tee joint, 14 - union joint, 15 - stop valve, 16 - pipeline connector, 17 - union joint, 18 - calibration joint. DETAILED DESCRIPTION

[0051] In order to make the technical scheme in the embodiments of the present application better understood, and to make the above-mentioned purpose, characteristics and advantages of the present application more apparent, clear and easy to understand, the specific embodiments of the present application will be further described in conjunction with the drawings.

[0052] It should be noted that the description of the embodiments is used to help understand the present application, but does not constitute a limitation of the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0053] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications will also change accordingly.

[0054] The present application provides a technical scheme: a gas instrument tee joint with a verification port, comprising a tee seat 3,

[0055] The lower end of the tee seat 3 is provided with an air inlet 4, and the upper end of the tee seat 3 is provided with an air outlet 1 for installing a connected instrument, the outer wall of the air inlet 4 is provided with a mounting thread, and the air outlet 1 adopts a barrel structure with a mounting thread on the outer wall;

[0056] The side end of the tee seat 3 is provided with a verification port, the verification port and the air outlet 1 are communicated through a first channel 310 inside the tee seat 3, the verification port and the air inlet 4 are communicated through a second channel 313 inside the tee seat 3, the first channel 310 and the second channel 313 are not communicated, and a one-way valve assembly 5 that only allows gas flow into the internal channel is fixedly installed on the verification port;

[0057] The one-way valve assembly 5, the inside of the one-way valve assembly 5 is respectively communicated with the first channel 310 and the second channel 313, when the calibration connector is connected, the one-way valve allows air intake, and the inside of the one-way valve assembly 5 and the second channel 313 are blocked, and the first channel 310 is communicated.

[0058] The outer wall thread of the air outlet 1 for installing a connected instrument is further provided with a positioning nut 2.

[0059] The air inlet end of the one-way valve assembly 5 is provided with a protective cap 19 to prevent dust and impurities from entering.

[0060] In an embodiment, as Figure 3 、 Figure 4 and Figure 5The first channel 310 connecting the calibration port and the outlet 1, and the second channel 313 connecting the calibration port and the inlet 4 are both right-angle channels.

[0061] In an embodiment, the first channel 310 connecting the calibration port and the outlet 1, and the second channel 313 connecting the calibration port and the inlet 4 can also be curved channels, and the channel length is not limited.

[0062] In an embodiment, the calibration port is arranged at the left end of the tee seat 3, and the structure of the one-way valve assembly is as follows,

[0063] The one-way valve assembly 5 comprises a one-way valve housing 510, a valve core shaft 519, a valve core stop ring 517, an elastic stop ring 512, and a compression spring 520.

[0064] The one-way valve housing 510 is internally provided with a valve body channel, the left end of the one-way valve housing 510 is provided with a joint 511 for connecting an external calibration joint 20, and the right end surface of the one-way valve housing 510 is sealingly connected with the calibration port of the side end of the tee seat 3.

[0065] The valve core shaft 519 is slidingly arranged in the valve body channel and is used for opening and closing the passage of the internal gas flow, and the valve core shaft 519 comprises a valve core top head 516 at the left end, an axial shoulder 526 at the middle part, and a valve core taper head 523 at the right end.

[0066] The valve core shaft at the left side of the axial shoulder 526 is sequentially inserted with the valve core stop ring 517 and the fixedly positioned elastic stop ring 512 from left to right, the inner side wall of the valve body channel is provided with a stop ring groove for installing the elastic stop ring 512, the part of the valve core shaft extending out of the elastic stop ring 512 is the valve core top head 516, the valve core shaft at the left side of the axial shoulder 526 is internally provided with an axial channel 514 and a radial valve hole 513, and the axial channel 514 and the valve hole 513 are in communication.

[0067] The compression spring 520 is inserted on the valve core shaft 519 at the right side of the axial shoulder 526, the right end surface of the compression spring 520 is in pressure connection with the calibration port, and the valve core taper head 523 at the right end of the valve core shaft 519 is in sliding sealing connection with the opening second hole 312 of the second channel at the calibration port.

[0068] The valve core shaft at the right side of the valve hole 513 and the valve core stop ring 517, the valve core stop ring 517 and the side wall of the valve body channel, and the valve core taper head 523 and the opening second hole 312 of the second channel at the calibration port are in sealing connection with the contact surfaces therebetween, and the sealing connection adopts a sealing ring.

[0069] The axial channel 514 and the valve hole 513, the gap between the axial shoulder 526 and the valve body channel 515, and the middle channel 521 at the right side of the axial shoulder 526 are in communication to form the gas flow channel of the one-way valve assembly.

[0070] Further, the left end of the valve core cone head 523 and the joint of the valve core shaft 519 are provided with a protrusion 525 for limiting.

[0071] Further, the protrusion 525 adopts the shaft shoulder 526 mode.

[0072] The contact surface between the valve core shaft on the right side of the valve hole 513 and the valve core retainer ring 517, the contact surface between the valve core retainer ring 517 and the side wall of the valve body passage 515, and the contact surface between the valve core cone head 523 and the second hole 312 of the opening of the check opening of the second passage are in sealing connection, and the sealing connection adopts a sealing ring. Specifically, the contact surface between the valve core shaft on the right side of the valve hole 513 and the valve core retainer ring 517 is provided with a first sealing ring 527, the contact surface between the valve core retainer ring 517 and the side wall of the valve body passage 515 is provided with a second sealing ring 518, and the contact surface between the valve core cone head 523 and the second hole 312 of the opening of the check opening of the second passage is provided with a third sealing ring 524.

[0073] In a preferred embodiment, the check opening provided at the side end of the three-way seat 3 is a stepped hole with an outer large and inner small structure, the second hole 312 of the opening of the check opening of the second passage 313 is provided on the bottom surface of the stepped hole, the first hole 311 of the opening of the check opening of the first passage 310 is provided on the stepped surface, the center line of the valve core cone head 523 coincides with the center line of the second hole 312, the valve core cone head 523 is in sealing connection or disconnected with the second hole 312 by sliding with the valve core shaft 519, and is used for opening and closing the passage between the internal airflow passage of the one-way valve assembly and the second passage 313, the right end outer side surface of the one-way valve housing 510 is in sealing connection with the stepped side surface of the stepped hole, and the right end surface of the compression spring 520 is in top pressing connection with the bottom surface of the stepped hole.

[0074] The right end of the one-way valve housing 510 and the sealing surface 6 of the stepped hole, and the right end surface of the compression spring 520 and the positioning surface 7 of the stepped hole are shown in Figure 4 .

[0075] In an embodiment, the check opening provided at the side end of the three-way seat 3 is a counterbore, the second hole 312 of the opening of the check opening of the second passage 313 is provided along the center line of the counterbore, the center line of the valve core cone head 523 coincides with the center line of the second hole 312, the first hole 311 of the opening of the check opening of the first passage 310 is provided on the periphery of the second hole 312, the second hole 312 is in communication with the intermediate passage 521 of the one-way valve assembly 5, the valve core cone head 523 is in sealing connection or disconnected with the second hole 312 by sliding with the valve core shaft 519, and is used for opening and closing the passage between the internal airflow passage of the one-way valve assembly 5 and the second passage 313, the right end outer side surface of the one-way valve housing 510 is in sealing connection with the side surface of the counterbore, and the right end surface of the compression spring 520 is in top pressing connection with the bottom surface of the counterbore.

[0076] In a preferred embodiment, the one-way valve housing 510 is a left-right through cylindrical structure, and the inside of the cylinder is the valve body passage 515.

[0077] Further, the right end outer side of the one-way valve housing 510 is sealed and connected with the stepped hole side by welding.

[0078] Further, the right end outer side of the one-way valve housing 510 is sealed and connected with the counterbore side by welding.

[0079] The operation and gas flow direction when the instrument detects the state, as Figure 6 , the arrow indicates the direction of the gas flow.

[0080] The instrument (such as a sulfur hexafluoride digital density relay) is installed and connected on the gas outlet 1, and the lower end of the three-way seat 3 is connected to the switch device body. Then open the valve on the body. When the instrument detects the state, the one-way valve assembly 5 of the calibration port cannot enter the gas. At this time, the gas flow in the switch device enters from the gas inlet 4, passes through the second channel 313 in the three-way seat 3, enters the intermediate channel 521 of the one-way valve assembly.

[0081] When the instrument detects the state, the valve core shaft 519 (valve core taper head 523) is pressed against the right end of the shaft shoulder 526 and the valve core retainer ring 517 under the action of the compression spring 520. The valve core shaft and the valve core retainer ring 517 on the right side of the valve hole are sealed, and the valve core retainer ring 517 and the one-way valve housing 510 are sealed. The gas flow in the intermediate channel 521 passes through the first channel 310 in the first hole 311 of the opening of the verification port, flows into the first channel 310, enters the sensing surface of the instrument 8 at the upper end of the three-way seat 3, and the instrument 8 can be detected in real time.

[0082] The operation and gas flow direction when the instrument detects the state, as Figure 7 , the arrow indicates the direction of the gas flow.

[0083] When calibrating, remove the protective cap at the gas inlet end of the one-way valve assembly, and connect the external calibration connector 20 to the external thread at the gas inlet end of the one-way valve assembly 5. The top core shaft in the calibration connector moves inward to open the valve core top head 516 of the one-way valve assembly 5, the valve core shaft 519 moves to the right, the shaft shoulder 526 moves to the right, the seal between the valve core shaft and the valve core retainer ring 517 is gradually disengaged, the valve core taper head 523 moves to the right, and the second hole 312 of the opening of the verification port is blocked. The calibration gas enters the valve body channel 515 from the external calibration connector 20, flows through the axial channel 514, the valve hole 513, the gap between the valve core shaft and the valve core retainer ring 517, the gap between the shaft shoulder 526 and the valve body channel 515, enters the intermediate channel 521, and then enters the first channel 310 through the first hole 311 of the opening of the verification port. From the gas outlet 1 into the instrument, thereby realizing the calibration of the instrument 8 installed on the gas outlet 1.

[0084] Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. In addition, it should be understood that, although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A gas meter union with a check port, characterized by: The three-way seat (3) is provided with an air inlet (4) at the lower end, and an air outlet (1) for installing a connected instrument at the upper end. The outer wall of the air inlet (4) is provided with a mounting thread, and the air outlet (1) adopts a cylinder shell structure with a mounting thread on the outer wall. The side end of the three-way seat (3) is provided with a verification port, and the verification port and the air outlet (1) are communicated through a first channel (310) in the three-way seat (3), and the verification port and the air inlet (4) are communicated through a second channel (313) in the three-way seat (3), and the first channel (310) and the second channel (313) are not communicated, and a one-way valve assembly (5) is fixedly installed on the verification port, which only allows air flow to enter the internal channel. The one-way valve assembly (5) is connected to the calibration connector, and the one-way valve assembly (5) allows air intake, and the inside of the one-way valve assembly (5) is blocked with the second channel (313), and is communicated with the first channel (310).

2. The three-way joint of claim 1, wherein: A positioning nut (2) is further installed on the outer wall thread of the air outlet (1) for installing a connected instrument.

3. The three-way joint of claim 1 or 2, wherein: A protective cap is installed on the air inlet end of the one-way valve assembly (5) to prevent dust and impurities from entering.

4. The three-way joint of claim 3, wherein: The one-way valve assembly (5) comprises a one-way valve housing (510), a valve core, a valve core stop ring (517), an elastic retainer (512), and a compression spring (520). The one-way valve housing (510) is provided with a valve body channel (515) inside, a connector (511) for connecting an external calibration connector (20) at the left end of the one-way valve housing (510), and a right end surface of the one-way valve housing (510) is sealingly connected with the verification port at the side end of the three-way seat (3). A valve core is slidably arranged in the valve body channel for opening and closing the passage of air flow into the interior, The left end of the valve core shaft (519) is a valve core top head (516), the middle part of the valve core shaft (519) is provided with a shaft shoulder (526), and the right end of the valve core shaft (519) is provided with a valve core taper head (523), The valve core shaft on the left side of the shaft shoulder (526) is sequentially inserted with a limiting valve core stop ring (517) and a fixedly positioned elastic retainer (512) from left to right, a retainer groove for installing the elastic retainer (512) is formed in the inner side wall of the valve body channel, the part of the valve core shaft extending out of the elastic retainer (512) to the left is the valve core top head (516), an axial channel (514) is formed in the valve core shaft on the left side of the shaft shoulder (526), and a radial valve hole (513) is also formed, and the axial channel (514) and the valve hole (513) are communicated. The compression spring (520) is inserted on the right side of the valve core shaft (519) of the shaft shoulder (526), the right end surface of the compression spring (520) is in abutting connection with the calibration opening, the valve core taper head (523) at the right end of the valve core shaft (519) is in sliding sealing connection with the second hole (312) of the second channel (313) of the calibration opening. The valve core shaft on the right side of the valve hole (513) is connected with the valve core blocking ring (517), the valve core blocking ring (517) is in sealing connection with the side wall of the valve body channel, the valve core taper head (523) is in sealing connection with the second hole (312) of the second channel (313) of the calibration opening. The gap between the axial channel (514) and the valve hole (513), the shaft shoulder (526) and the valve body channel, and the middle channel (521) on the right side of the shaft shoulder (526) form the gas flow channel of the one-way valve assembly.

5. The tee joint according to claim 4, characterized in that: The left end of the valve core taper head (523) and the joint part of the valve core shaft (519) are provided with a protrusion (525) for limiting.

6. The tee joint according to claim 5, characterized in that: The calibration opening formed on the side end of the tee seat (3) is a counterbore, the second hole (312) of the second channel (313) is formed along the center line of the counterbore, the center line of the valve core taper head (523) coincides with the center line of the second hole (312), the first hole (311) of the first channel (310) is formed on the periphery of the second hole (312) in the calibration opening, the second hole (312) is in communication with the middle channel (521) of the one-way valve assembly (5), the valve core taper head (523) is in sealing connection or disconnected with the second hole (312) by sliding with the valve core shaft (519), and is used for opening and closing the passage between the internal gas flow channel of the one-way valve assembly (5) and the second channel (313), the right end outer side surface of the one-way valve housing (510) is in sealing connection with the side surface of the counterbore, and the right end surface of the compression spring (520) is in abutting connection with the bottom surface of the counterbore.

7. The tee joint according to claim 5, characterized in that: The calibration opening formed on the side end of the tee seat (3) is a stepped hole with a large outer diameter and a small inner diameter, the second hole (312) of the second channel (313) is formed on the bottom surface of the stepped hole in the calibration opening, and the first hole (311) of the first channel (310) is formed on the stepped surface in the calibration opening, The center line of the valve core taper head (523) coincides with the center line of the second hole (312), the valve core taper head (523) is in sealing connection or disconnected with the second hole (312) by sliding with the valve core shaft (519), and is used for opening and closing the passage between the internal gas flow channel of the one-way valve assembly and the second channel (313), the right end outer side surface of the one-way valve housing (510) is in sealing connection with the side surface of the stepped hole, and the right end surface of the compression spring (520) is in abutting connection with the bottom surface of the stepped hole.

8. Any one of the tee joints according to claims 6 or 7, characterized in that: The one-way valve housing (510) is a left-right-through cylindrical structure, and the inside of the cylinder is a valve body channel.

9. The tee joint according to claim 6, characterized in that: The right end outer side surface of the one-way valve housing (510) is sealed and connected with the counterbore side surface by welding.

10. The tee joint of claim 7, wherein: The right end outer side surface of the one-way valve housing (510) is sealed and connected with the stepped hole side surface by welding.

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