one-way valve

Abstract

The application relates to a one-way valve, which comprises a valve body, a valve core assembly and a valve seat, the valve core assembly comprises a valve core and a guide piece, the guide piece and the valve seat are fixedly arranged in the valve body and are spaced apart along the axial direction of the valve body, the valve seat and the end of the valve body away from the guide piece surround to form a first cavity, the valve seat and the guide piece surround to form a second cavity, the valve seat is provided with a valve port for connecting the first cavity and the second cavity, the guide piece and the end of the valve body away from the valve seat surround to form a third cavity; the valve core is movably arranged in the second cavity and is used for opening or closing the valve port, the valve core is movably sleeved on the guide piece and surrounds the guide piece to form an inner cavity, and the valve core assembly is provided with an air inlet channel and an air outlet channel, the air inlet channel connects the inner cavity and the third cavity, and the air outlet channel connects the inner cavity and the second cavity. The one-way valve provided by the application can form an air flow channel between the parts in the valve cavity, so that the protective gas can flow smoothly.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a check valve. Background Technology

[0002] Stainless steel check valves typically consist of a valve body, a valve core, and a guide sleeve. The guide sleeve is located inside the valve body, and the valve core is movably connected to the guide sleeve, used for reciprocating movement within the valve cavity to open or close the valve port. At the client end, the two ends of the stainless steel check valve are usually connected to external stainless steel pipes and then placed horizontally in a tunnel furnace for welding. During the welding process of the stainless steel check valve and the external stainless steel pipes in the tunnel furnace, internal parts of the stainless steel check valve, such as the valve core and guide sleeve, are prone to oxidation. To mitigate this oxidation problem, protective gas can be introduced into the valve cavity during the tunnel furnace welding process. The key technical challenge is how to create airflow channels between the various components within the valve cavity to ensure smooth flow of the protective gas. Utility Model Content

[0003] Therefore, it is necessary to provide a one-way valve to form an airflow channel between the various components inside the valve chamber, so as to allow the protective gas to flow smoothly.

[0004] A one-way valve includes a valve body, a valve core assembly, and a valve seat. The valve core assembly includes a valve core and a guide member. The guide member and the valve seat are both fixedly disposed within the valve body and spaced apart along the axial direction of the valve body. The valve seat and the end of the valve body away from the guide member form a first cavity, and the valve seat and the guide member form a second cavity. The valve seat has a valve port for connecting the first cavity and the second cavity. The guide member and the end of the valve body away from the valve seat form a third cavity. The valve core is movably disposed in the second cavity and is used to open or close the valve port. The valve core is movably sleeved on the guide member and forms an inner cavity with the guide member. The valve core assembly has an inlet channel and an outlet channel. The inlet channel connects the inner cavity and the third cavity, and the outlet channel connects the inner cavity and the second cavity. When the valve port is opened and protective gas is introduced into the third cavity, the protective gas can enter the inner cavity through the inlet channel, then enter the second cavity through the outlet channel, and then flow to the first cavity through the valve port.

[0005] In one embodiment, the air intake channel is formed on the guide member, and one end of the air intake channel passes through the end face of the guide member facing the third cavity, and the other end passes through the end face of the guide member facing the inner cavity.

[0006] In one embodiment, the guide includes a support retaining ring and a guide sleeve. The support retaining ring is fixedly connected to the valve body, one end of the guide sleeve is connected to the support retaining ring, and the other end is used to connect to the valve core. The air intake passage is opened in the guide sleeve or the support retaining ring.

[0007] In one embodiment, the guide sleeve has a connecting portion, a transition portion, and a guiding portion. The transition portion connects the guiding portion and the connecting portion, and the valve core is movably sleeved on the guiding portion. The support retaining ring is separately provided with the guide sleeve, and the support retaining ring has an installation hole. The connecting portion extends into the installation hole and is welded and fixed to the installation hole. Alternatively, the support retaining ring is integrally provided with the guide sleeve.

[0008] In one embodiment, the cross-sectional area of ​​the air intake passage tends to increase along the direction from the connecting portion to the guide portion; the diameter of the air intake passage at the connecting portion is... And 1mm≤ ≤1.5mm.

[0009] In one embodiment, at least one of the sidewall of the valve core that contacts the guide and the sidewall of the guide that contacts the valve core is provided with a groove, the groove being used to form an air outlet passage between the valve core and the guide.

[0010] In one embodiment, at least one of the sidewall of the valve core that contacts the guide and the sidewall of the guide that contacts the valve core is provided with a first recess, the first recess being used to form an air intake passage between the valve core and the guide.

[0011] In one embodiment, the guide includes a support retaining ring and a guide sleeve. The support retaining ring is fixedly connected to the valve body. One end of the guide sleeve is connected to the support retaining ring, and the other end is used to connect to the valve core. A first recess is formed at the end of the guide sleeve away from the support retaining ring. A second recess is provided on the side wall of the support retaining ring, and the second recess is provided in correspondence with the first recess and is interconnected with it.

[0012] In one embodiment, the walls of the first recess and the second recess are both configured as arc-shaped, or the walls of the first recess and the second recess are both configured as planar.

[0013] In one embodiment, the air outlet passage is configured as a through hole, which is formed in the side wall of the valve core.

[0014] In one embodiment, the valve core has a sleeve portion and an end head. The sleeve portion is movably sleeved on the guide member, and the end head is connected to one end of the sleeve portion near the valve port. The end head is used to open or close the valve port, and a through hole is provided at one end of the sleeve portion near the end head.

[0015] In one embodiment, when the valve core is moved to the maximum open position, the through hole remains connected to the inner cavity and the second cavity.

[0016] In one embodiment, the through-hole is configured as a circular hole, and the diameter of the through-hole is [missing information]. And 1mm≤ ≤1.5mm; or, the through hole is configured as a rectangular hole, and the length of the through hole is And 1.5mm≤ ≤2.5mm; the width of the through hole is And 1mm≤ ≤2mm; or, the through hole is configured as a square hole.

[0017] Compared with existing technologies, the one-way valve provided in this application, when the valve port is open and protective gas is introduced into the third chamber, can form an airflow channel inside the one-way valve. The protective gas flows along the airflow channel in the following path: third chamber - inner chamber - second chamber - valve port - first chamber. The protective gas circulates within the one-way valve according to the aforementioned airflow channel, effectively expelling oxygen from the valve. This provides continuous protection for the valve core and guide components during tunnel furnace welding, effectively slowing down oxidation of the valve core and guide components. Furthermore, by forming the aforementioned airflow channel, oxygen in the inner chamber can be fully eliminated, reducing the risk of oxide layer formation on the inner wall of the valve core and improving the smoothness of the valve core's movement along the guide components. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A cross-sectional view of the check valve in Embodiment 1 provided in this application;

[0020] Figure 2 This is a schematic diagram of the guide component in Embodiment 1 provided in this application;

[0021] Figure 3 A cross-sectional view of the check valve in Embodiment 2 provided in this application;

[0022] Figure 4 This is a schematic diagram of the guide sleeve in Embodiment 2 provided in this application;

[0023] Figure 5 A cross-sectional view of the guide component in Embodiment 2 provided in this application;

[0024] Figure 6 Schematic diagram of the valve core in Embodiment 2 provided in this application Figure 1 ;

[0025] Figure 7 Schematic diagram of the valve core in Embodiment 2 provided in this application Figure 2 ;

[0026] Figure 8Cross-sectional view of the check valve in Embodiment 3 provided in this application Figure 1 ;

[0027] Figure 9 Cross-sectional view of the check valve in Embodiment 3 provided in this application Figure 2 ;

[0028] Figure 10 This is a schematic diagram of the guide component in Embodiment 3 provided in this application.

[0029] Reference numerals: 100, one-way valve; 101, valve core assembly; 102, air inlet passage; 103, air outlet passage; 104, airflow passage; 110, valve body; 111, valve chamber; 112, first chamber; 113, second chamber; 114, third chamber; 120, valve seat; 1201, guide section; 1202, valve port section; 121, valve port; 130, guide element; 131, support retaining ring; 1311, mounting hole; 1314, support arm; 1315, flow channel; 1316, second recess; 132, guide sleeve; 1320, guide part; 1321, connecting part; 1322, transition part; 1323, groove; 1329, first recess; 140, valve core; 141, sleeve part; 142, end head; 146, inner cavity; 147, through hole. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figures 1 to 2This application provides a one-way valve 100, which is made of stainless steel. The one-way valve 100 includes a valve body 110, a valve core assembly 101, and a valve seat 120. The valve body 110 has a valve cavity 111. The valve core assembly 101 includes a valve core 140 and a guide member 130. The guide member 130 and the valve seat 120 are both fixedly disposed in the valve body 110 and spaced apart along the axial direction of the valve body 110. The guide member 130 and the valve seat 120 divide the valve cavity 111 into a first cavity 112, a second cavity 113, and a third cavity 114. Specifically, the valve seat 120 and the valve body 110 at the ends away from the guide member 130 form a first cavity 112, the valve seat 120 and the guide member 130 form a second cavity 113, the valve seat 120 has a valve port 121 for connecting the first cavity 112 and the second cavity 113, and the guide member 130 and the valve body 110 at the ends away from the valve seat 120 form a third cavity 114. The valve core 140 is movably disposed in the second cavity 113 and is used to open or close the valve port 121. The valve core 140 is movably sleeved on the guide member 130 and forms an inner cavity 146 with the guide member 130. The valve core assembly 101 has an air inlet channel 102 and an air outlet channel 103. The air inlet channel 102 connects the inner cavity 146 and the third cavity 114, and the air outlet channel 103 connects the inner cavity 146 and the second cavity 113. When the valve port 121 is opened and protective gas is introduced into the third cavity 114, the protective gas can enter the inner cavity 146 through the air inlet channel 102, then enter the second cavity 113 through the air outlet channel 103, and then flow to the first cavity 112 through the valve port 121.

[0036] Understandably, with this configuration, when valve port 121 is open and protective gas is introduced into the third chamber 114, an airflow channel 104 can be formed inside the one-way valve 100. The protective gas flows along the airflow channel 104 in the following path: third chamber 114 - inner chamber 146 - second chamber 113 - valve port 121 - first chamber 112. The protective gas circulates within the one-way valve 100 according to the aforementioned airflow channel 104, effectively expelling oxygen from the one-way valve 100. This provides continuous protection for the valve core 140 and guide member 130 during tunnel furnace welding, effectively mitigating oxidation of the valve core 140 and guide member 130. Furthermore, by forming the aforementioned airflow channel 104, oxygen in the inner chamber 146 can be effectively expelled, reducing the risk of oxide layer formation on the inner wall of the valve core 140 and improving the smoothness of the valve core 140's movement along the guide member 130.

[0037] It should be noted that the inner cavity 146 formed between the valve core 140 and the guide member 130 refers to the inner wall of the valve core 140 and the side end face of the guide member 130 near the valve port 121 forming the inner cavity 146. As the valve core 140 and the side wall of the guide member 130 reciprocate, the volume of the inner cavity 146 increases or decreases accordingly.

[0038] The guide member 130 includes a support retaining ring 131 and a guide sleeve 132. The support retaining ring 131 is fixedly connected to the valve body 110. One end of the guide sleeve 132 is connected to the support retaining ring 131, and the other end is used to connect to the valve core 140.

[0039] Please see Figure 6 The valve core 140 has a sleeve portion 141 and an end head 142, both of which are hollow structures. The sleeve portion 141 is movably fitted onto the guide sleeve 132, and the end head 142 is connected to the end of the sleeve portion 141 near the valve port 121. Along the direction from the end head 142 to the sleeve portion 141, the cross-sectional area of ​​the end head 142 gradually increases, and the end of the end head 142 facing the valve port 121 is closed. The valve core 140 has a closed position and a maximum open position, and the valve core 140 reciprocates between the closed position and the maximum open position. Specifically, when the valve core 140 is in the closed position, the end head 142 closes the valve port 121; when the valve core 140 is in the maximum open position, the end head 142 disengages from the valve port 121, and the distance between the end head 142 and the valve port 121 is at its maximum.

[0040] Maximum valve opening position, such as Figure 1 and Figure 3 As shown, the valve seat 120 has a guide section 1201 and a valve port section 1202. The valve port section 1202 has a valve port 121, and the guide section 1201 is located on the side of the valve port section 1202 facing the valve core 140. During the movement of the valve core 140, at least a portion of the outer wall of the sleeve portion 141 can slide along the inner wall of the guide section 1201. Thus, in addition to the guiding effect between the sleeve portion 141 and the guide sleeve 132, the guide section 1201 and the sleeve portion 141 can also play a guiding role, which helps to prevent the valve core 140 from deflecting, improves the coaxiality of the valve core 140 and the valve port 121, and thus improves the sealing performance of the valve port 121 when closed.

[0041] The following describes several configurations of the airflow passage 104 in the one-way valve 100.

[0042] Example 1

[0043] Please see Figure 1 In this embodiment, the air intake channel 102 is configured such that it is formed on the guide member 130, with one end of the air intake channel 102 penetrating the end face of the guide member 130 facing the third cavity 114, and the other end penetrating the end face of the guide member 130 facing the inner cavity 146. Thus, the protective gas in the third cavity 114 can enter the air intake channel 102 from the end of the guide member 130 facing the third cavity 114, and flow out of the air intake channel 102 from the end of the guide member 130 facing the inner cavity 146 and into the inner cavity 146.

[0044] In one implementation, such as Figure 1 and Figure 2 As shown, an intake passage 102 is formed in the guide sleeve 132, and the intake passage 102 extends through both end faces of the guide sleeve 132 along its axial direction. Specifically, the guide sleeve 132 has a connecting portion 1321, a transition portion 1322, and a guide portion 1320. The transition portion 1322 connects the guide portion 1320 and the connecting portion 1321, and the cross-sectional area of ​​the transition portion 1322 gradually increases along the direction from the connecting portion 1321 to the guide portion 1320. Furthermore, the connecting portion 1321, the transition portion 1322, and the guide portion 1320 are configured as an integral structure, and the intake passage 102 extends along the axial direction of the guide sleeve 132 and extends through the connecting portion 1321, the transition portion 1322, and the guide portion 1320. The valve core 140 is movably sleeved on the guide portion 1320.

[0045] Along the direction from the connecting portion 1321 to the guide portion 1320, the cross-sectional area of ​​the intake passage 102 tends to increase. Thus, the trend of change in the cross-sectional area of ​​the intake passage 102 along the direction from the connecting portion 1321 to the guide portion 1320 matches the trend of change in the cross-sectional area of ​​the guide sleeve 132. That is, where the cross-sectional area of ​​the guide sleeve 132 is large, the cross-sectional area of ​​the intake passage 102 is also correspondingly large, which helps to reduce the weight of the guide sleeve 132.

[0046] The diameter of the intake passage 102 at the connection 1321 is [missing information]. And 1mm≤ ≤1.5mm. For example, The value can be 1mm, 1.1mm, 1.2mm, 1.25mm, 1.3mm, 1.5mm, etc., and can be set according to actual needs.

[0047] like Figure 2 and Figure 3 As shown, one end of the support retaining ring 131 is connected to the side wall of the guide sleeve, and the other end extends toward and connects to the valve body 110. Specifically, the support retaining ring 131 includes a plurality of support arms 1314, which are distributed circumferentially along the support retaining ring 131. A flow channel 1315 is formed between two adjacent support arms 1314, the guide sleeve 132, and the valve body 110. Each support arm 1314 is connected to the valve body 110.

[0048] Optionally, such as Figures 3 to 5As shown, the support retaining ring 131 and the guide sleeve 132 are separately configured. Specifically, the support retaining ring 131 has a mounting hole 1311, and the connecting part 1321 extends into the mounting hole 1311 and is welded and fixed to the mounting hole 1311. Alternatively, the support retaining ring 131 and the guide sleeve 132 can be integrally configured. Specifically, the support arm 1314 is connected to the connecting part 1321.

[0049] In another embodiment, the air intake passage 102 may also be formed within the support retaining ring 131. Specifically, the guide sleeve may have a mounting hole, into which the support retaining ring 131 extends. In other words, the guide sleeve is fitted onto the outer wall of the support retaining ring 131 through the mounting hole. Please refer to [link to relevant documentation]. Figures 1 to 2 In this embodiment, the air outlet channel is configured such that at least one of the sidewall of the valve core 140 that contacts the guide member 130 and the sidewall of the guide member 130 that contacts the valve core 140 is provided with a groove 1323, which forms an air outlet channel 103 between the valve core 140 and the guide member 130. That is, the groove 1323 may only be provided on the sidewall of the valve core 140 that contacts the guide member 130; or, the groove 1323 may only be provided on the sidewall of the guide member 130 that contacts the valve core 140; or, the groove 1323 may be provided on both the sidewall of the valve core 140 that contacts the guide member 130 and the sidewall of the guide member 130 that contacts the valve core 140. Thus, the groove 1323 not only forms an air outlet channel 103 connecting the inner cavity 146 and the valve cavity 111, but also forms a non-contact area between the valve core 140 and the guide member 130, thereby reducing the contact area between the valve core 140 and the guide member 130, which helps to avoid common oxidation between the contact surfaces of the guide sleeve 132 and the valve core 140.

[0050] Specifically, a groove 1323 is formed in the guide portion 1320, and the groove 1323 is configured as a strip-shaped groove. The groove 1323 extends along the axial direction of the guide sleeve 132, or the groove 1323 may be inclined relative to the axis of the guide sleeve 132.

[0051] For example, the groove 1323 extends axially along the guide sleeve 132 and penetrates both end faces of the guide portion 1320 along the axial direction of the guide sleeve 132. Thus, the groove 1323 connects the inner cavity 146 and the valve cavity 111. When the one-way valve 100 is welded to the stainless steel pipeline in the tunnel furnace, the protective gas enters the inner cavity 146 of the valve core 140 from the valve cavity 111 along the groove 1323 and can then be discharged into the valve cavity 111 along the groove 1323. The protective gas flows along the above path and can discharge oxygen from the guide sleeve 132 and the inner cavity 146 of the valve core 140.

[0052] The number of grooves 1323 can be configured to be multiple, and the multiple grooves 1323 are distributed at intervals along the circumference of the guide sleeve 132. In this way, the valve core 140 is subjected to more uniform force.

[0053] Example 2

[0054] Please see Figures 3 to 7 In this embodiment, the air intake channel 102 is configured in the same way as in Embodiment 1. In this embodiment, the air outlet channel 103 is configured as a through hole 147, which is formed on the side wall of the valve core 140. This makes the air outlet channel 103 simple in structure and easy to manufacture.

[0055] Furthermore, when the valve core 140 moves to the maximum open position, the through hole 147 remains connected to the inner cavity 146 and the second cavity 113. This prevents the through hole 147 from being blocked and closed by the guide member 130 due to the valve core 140 moving to overlap with the guide member 130. This helps ensure that the protective gas in the inner cavity 146 flows out normally through the outlet channel 103.

[0056] Specifically, the through hole 147 is located at the end of the sleeve portion 141 near the end head 142. It can be understood that as the valve core 140 moves toward the guide member 130, the opening of the valve port 121 gradually increases. Therefore, by providing the through hole 147 at the end of the sleeve portion 141 near the end head 142, it is beneficial to ensure that when the valve core is in the maximum open position, the protective gas in the inner cavity 146 can also be discharged into the second cavity 113 through the through hole 147.

[0057] Optionally, the number of through holes 147 is configured to be multiple, and the multiple through holes 147 are distributed at intervals along the circumference of the valve core 140. In this way, protective gas can be discharged from different positions along the circumference of the valve core 140. Furthermore, the multiple through holes 147 can also be evenly distributed at intervals along the circumference of the valve core 140.

[0058] In one implementation, such as Figure 6 As shown, the through hole 147 is configured as a circular hole, and the diameter of the through hole 147 is [missing information]. And 1mm≤ ≤1.5mm. For example, The value can be 1mm, 1.1mm, 1.2mm, 1.25mm, 1.3mm, 1.5mm, etc., and can be set according to actual needs.

[0059] Alternatively, in another implementation, such as Figure 7 As shown, the through hole 147 can also be configured as a rectangular hole, and the length of the through hole 147 is... And 1.5mm≤ ≤2.5mm. For example, The value can be 1.5mm, 1.55mm, 1.9mm, 2.0mm, 2.1mm, 2.5mm, etc., and can be set according to actual needs. The width of through hole 147 is... And 1mm≤ ≤2mm. For example, The value can be 1mm, 1.4mm, 1.5mm, 1.55mm, 1.7mm, 1.9mm, 2mm, etc., and can be set according to actual needs.

[0060] Alternatively, in yet another embodiment, the through hole 147 is configured as a square hole.

[0061] Example 3

[0062] Please see Figures 8 to 10 In this embodiment, the intake channel 102 is configured such that at least one of the sidewall of the valve core 140 that contacts the guide member 130 and the sidewall of the guide member 130 that contacts the valve core 140 is provided with a first recess 1329, which forms the intake channel 102 between the valve core 140 and the guide member 130. That is, the first recess 1329 may only be provided on the sidewall of the valve core 140 that contacts the guide member 130; or, the first recess 1329 may only be provided on the sidewall of the guide member 130 that contacts the valve core 140; or, the sidewall of the valve core 140 that contacts the guide member 130 and the sidewall of the guide member 130 that contacts the valve core 140 are both provided with grooves 1323. Thus, the first recess 1329 not only forms an air intake passage 102 connecting the inner cavity 146 and the valve cavity 111, but also forms a non-contact area between the valve core 140 and the guide member 130, thereby reducing the contact area between the valve core 140 and the guide member 130, which helps to avoid common oxidation between the contact surfaces of the guide sleeve 132 and the valve core 140.

[0063] Specifically, the first recess 1329 is formed at the end of the guide sleeve 132 away from the support retaining ring 131. The support retaining ring 131 and the guide sleeve 132 are integrally formed, which helps to improve the structural strength of the guide member 130. Of course, the support retaining ring 131 and the guide sleeve 132 can also be separately formed and fixedly connected together.

[0064] Furthermore, the sidewall of the support retaining ring 131 is provided with a second recess 1316, and the second recess 1316 is correspondingly and interconnected with the first recess 1329. It should be noted that the corresponding arrangement of the second recess 1316 and the first recess 1329 means that the number and position of the second recess 1316 and the first recess 1329 are identical. Thus, when the sidewall of the support retaining ring 131 is connected to the valve body 110, the second recess 1316 and the valve body 110 form a flow channel 1315. When the one-way valve 100 is welded in the tunnel furnace, protective gas is supplied. The protective gas enters from the third chamber 114 and then flows along the flow channel 1315 into the air inlet channel 102 formed by the first recess 1329.

[0065] The number of first recesses 1329 is configured to be multiple, and the multiple first recesses 1329 are distributed at intervals along the circumference of the guide member 130. For example, the number of first recesses 1329 can be four, five, etc., and the number of first recesses 1329 is also correspondingly four or five.

[0066] Optionally, the wall surfaces of both the first recess 1329 and the second recess 1316 are configured as arc-shaped. Optionally, the wall surfaces of the first recess 1329 and the second recess 1316 are smoothly connected. Alternatively, both the wall surfaces of the first recess 1329 and the second recess 1316 are configured as flat surfaces.

[0067] In this embodiment, the configuration of the air outlet channel 103 is the same as that in Embodiment 2.

[0068] The welding of the one-way valve 100 provided in this application to the external pipeline includes the following steps:

[0069] After connecting the external pipeline to the one-way valve 100, place it flat in the tunnel furnace; adjust the placement angle of the external pipeline and the one-way valve 100 so that the height of the end of the one-way valve 100 with the valve port 121 is greater than the height of the end of the one-way valve 100 with the valve core assembly 101; move the valve core 140 so that the valve port 121 is in a non-closed state; introduce protective gas into the third chamber 114, the protective gas enters the inner chamber 146 through the air inlet channel 102, then enters the second chamber 113 through the air outlet channel 103, and then flows to the first chamber 112 through the valve port 121.

[0070] It is understandable that, since protective gas needs to be introduced into the valve chamber 111 from the end where the valve core assembly 101 is located, that is, the third chamber 114, the height of the valve port 121 of the one-way valve 100 is set to be greater than the height of the valve core assembly 101 of the one-way valve 100. This helps to prevent the protective gas from pushing the valve core 140 toward the valve port 121, causing the valve port 121 to close, thereby cutting off the airflow channel 104.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A one-way valve, characterized in that, The one-way valve (100) includes a valve body (110), a valve core assembly (101), and a valve seat (120). The valve core assembly (101) includes a valve core (140) and a guide (130). The guide (130) and the valve seat (120) are both fixedly disposed within the valve body (110) and spaced apart along the axial direction of the valve body (110). The valve seat (120) and the end of the valve body (110) away from the guide (130) form a first cavity (112). The valve seat (120) and the guide (130) form a second cavity (113). The valve seat (120) has a valve port (121) for connecting the first cavity (112) and the second cavity (113). The guide (130) and the end of the valve body (110) away from the valve seat (120) form a third cavity (114). The valve core (140) is movably disposed in the second cavity (113) and is used to open or close the valve port (121). The valve core (140) is movably sleeved on the guide member (130) and forms an inner cavity (146) between the valve core (140) and the guide member (130). The valve core assembly (101) has an air inlet channel (102) and an air outlet channel (103). The air inlet channel (102) connects the inner cavity (146) and the third cavity (114), and the air outlet channel (103) connects the inner cavity (146) and the second cavity (113). When the valve port (121) is opened and protective gas is introduced into the third chamber (114), the protective gas can enter the inner chamber (146) through the air inlet channel (102), then enter the second chamber (113) through the air outlet channel (103), and then flow to the first chamber (112) through the valve port (121).

2. The one-way valve according to claim 1, characterized in that, The air intake channel (102) is opened on the guide (130), and one end of the air intake channel (102) passes through the end face of the guide (130) facing the third cavity (114), and the other end passes through the end face of the guide (130) facing the inner cavity (146).

3. The one-way valve according to claim 2, characterized in that, The guide member (130) includes a support retaining ring (131) and a guide sleeve (132). The support retaining ring (131) is fixedly connected to the valve body (110). One end of the guide sleeve (132) is connected to the support retaining ring (131), and the other end is used to connect to the valve core (140). The air intake passage (102) is opened in the guide sleeve (132) or the support retaining ring (131).

4. The one-way valve according to claim 3, characterized in that, The guide sleeve (132) has a connecting part (1321), a transition part (1322) and a guide part (1320). The transition part (1322) connects the guide part (1320) and the connecting part (1321). The valve core (140) is movably sleeved on the guide part (1320). The support retaining ring (131) and the guide sleeve (132) are separately provided, and the support retaining ring (131) has a mounting hole (1311). The connecting part (1321) extends into the mounting hole (1311) and is welded and fixed to the mounting hole (1311); or, the support retaining ring (131) and the guide sleeve (132) are integrally provided.

5. The one-way valve according to claim 4, characterized in that, Along the direction from the connecting portion (1321) to the guide portion (1320), the cross-sectional area of ​​the air intake passage (102) tends to increase; The diameter of the air intake passage (102) at the connection (1321) is And 1mm≤ ≤1.5mm.

6. The one-way valve according to any one of claims 2-5, characterized in that, At least one of the sidewall of the valve core (140) that contacts the guide (130) and the sidewall of the guide (130) that contacts the valve core (140) is provided with a groove (1323), the groove (1323) being used to form the air outlet passage (103) between the valve core (140) and the guide (130).

7. The one-way valve according to claim 1, characterized in that, At least one of the sidewall of the valve core (140) that contacts the guide (130) and the sidewall of the guide (130) that contacts the valve core (140) is provided with a first recess (1329), the first recess (1329) being used to form the air intake passage (102) between the valve core (140) and the guide (130).

8. The one-way valve according to claim 7, characterized in that, The guide member (130) includes a support retaining ring (131) and a guide sleeve (132), and the support retaining ring (131) is fixedly connected to the valve body (110). One end of the guide sleeve (132) is connected to the support retaining ring (131), and the other end is used to connect to the valve core (140). The first recess (1329) is provided at the end of the guide sleeve (132) away from the support retaining ring (131). The side wall of the support retaining ring (131) is provided with a second recess (1316), and the second recess (1316) is provided in correspondence with the first recess (1329) and is interconnected with each other.

9. The one-way valve according to claim 8, characterized in that, The wall surfaces of the first recess (1329) and the second recess (1316) are both configured as arc-shaped, or the wall surfaces of the first recess (1329) and the second recess (1316) are both configured as planes.

10. The one-way valve according to claim 1, characterized in that, The air outlet channel (103) is configured as a through hole (147), which is opened on the side wall of the valve core (140).

11. The one-way valve according to claim 10, characterized in that, The valve core (140) has a sleeve portion (141) and an end head (142). The sleeve portion (141) is movably sleeved on the guide member (130). The end head (142) is connected to one end of the sleeve portion (141) near the valve port (121) and the end head (142) is used to open or close the valve port (121). The through hole (147) is provided at one end of the sleeve portion (141) near the end head (142).

12. The one-way valve according to claim 10 or 11, characterized in that, When the valve core (140) moves to the maximum open position, the through hole (147) remains connected to the inner cavity (146) and the second cavity (113).

13. The one-way valve according to claim 10, characterized in that, The through hole (147) is configured as a circular hole, and the diameter of the through hole (147) is And 1mm≤ ≤1.5mm; Alternatively, the through hole (147) can be configured as a rectangular hole, and the length of the through hole (147) is... And 1.5mm≤ ≤2.5mm; the width of the through hole (147) is And 1mm≤ ≤2mm; Alternatively, the through hole (147) may be configured as a square hole.

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