A one-way valve pre-welding air tightness inspection device and method

Abstract

The application discloses a kind of one-way valve airtight inspection device and method before welding, device structure, sleeve inside is equipped with two sealing grooves, end face is equipped with a sealing groove;Left sleeve nut has two sealing parts, and is sealed with left connector cooperation, right sleeve nut and right connector cooperate sealing;Device inside is equipped with pad, internal hexagon bolt and top rod.The use method of the application is as follows: top rod and pad screw are respectively loaded into one-way valve, left and right valve core are respectively pulled apart, sleeve, right connector, right sleeve nut and rubber ring are sequentially installed on the right end of one-way valve, left connector, left sleeve nut and rubber ring are sequentially installed on the left end of one-way valve, respectively keep right and left valve core closed state, realize airtightness check before welding to left and right valve core.The airtightness inspection device of the application can be widely applied to the field of one-way valve airtightness check before welding, with the advantages of simple structure, reliable sealing and novel structure.

Description

Technical Field

[0001] This invention relates to the field of valve pre-welding airtightness inspection devices, and particularly to a one-way valve pre-welding airtightness inspection device and method. Background Technology

[0002] High-temperature check valves have a double-core hard-seal welded structure. After welding, the valve core is checked for air tightness. Because the valve core and valve seat are hard-seal structures, the failure rate of the air tightness test is very high. Moreover, check valves cannot be disassembled after welding and must be reassembled. If the air tightness fails, the valve can only be downgraded or scrapped, which is very costly.

[0003] Pre-testing the airtightness of the dual valve cores before welding can greatly improve the airtightness pass rate of the valve cores after welding, thereby increasing the overall product pass rate. Summary of the Invention

[0004] The technical problem solved by the present invention is to overcome the defect that airtightness inspection cannot be performed before welding one-way valves, and to provide an airtightness inspection device and method for one-way valves before welding, so as to solve the problem of high failure rate of valve core airtightness inspection after welding.

[0005] The technical solution of the present invention is: a one-way valve airtightness inspection device before welding, the device comprising a sleeve, a right outer nut, a right rotary joint, a left rotary joint, a left outer nut, a left rotary joint, a push rod, and a pull-opening device; The sleeve has two sealing grooves inside the bore, which are referred to as the first sealing groove and the second sealing groove from left to right; there is one sealing groove on the right end face, which is referred to as the third sealing groove; there is a clamp in the inner bore, which is located between the second sealing groove and the third sealing groove; the sleeve is used to fit over the outside of the pre-welding check valve and to seal with the pre-welding check valve; the clamp inside the sleeve is located on the right side of the step surface of the pre-welding check valve for limiting movement. The left end plane and inner hole of the right outer nut are sealing surfaces. The left end plane of the right outer nut is sealed to the right end plane of the sleeve. The inner hole of the right outer nut is sealed to the right rotatable joint. At the same time, the right rotatable joint is sealed to the right end interface of the one-way valve before welding. There is a vent hole in the middle of the right rotatable joint for venting the valve core on the right side. The left outer nut is connected to the outside of the left end interface of the pre-welding check valve and the left rotary joint, while the left rotary joint is sealed to the left end interface of the pre-welding check valve. The left-hand joint has a vent hole in the middle and a push rod positioning groove on the end face; one end of the push rod is connected to the left-hand joint and is used to guide the gas through the left-hand joint into the valve seat of the left end of the one-way valve before welding, and the other end is used to push open the left valve core. The pull-out device is connected to the right valve core and is used to introduce the gas that has passed through the right valve core of the check valve before welding into the inside of the check valve.

[0006] Preferably, the push rod has a stepped structure, consisting of a large-diameter section and a small-diameter section. The small-diameter section is used to position and mate with the left valve core, and the large-diameter section is used to position and mate with the left rotary joint. Under the push of the left rotary joint, the left valve core is opened. The large-diameter section has a vent hole for introducing air from the left rotary joint into the left end valve seat of the one-way valve before welding.

[0007] Preferably, the pull-opening device includes a pad and an internal hex bolt; The inner hole of the pad is a stepped hole. The small hole is connected by a thread to limit the end face of the hexagon socket bolt. The large hole is matched with the small end of the right valve core to limit the end face of the right valve core. The hexagon socket bolt passes through the pad and connects to the right valve core. Tightening the hexagon socket bolt is used to lift the right valve core and put the right valve core in the open position.

[0008] Preferably, the spacing between the first sealing groove, the second sealing groove, and the clamp is appropriate, so that the two unwelded welds of the one-way valve before welding are located between the first sealing groove and the second sealing groove, and between the second sealing groove and the clamp, respectively, thus sealing the two unwelded welds of the one-way valve separately.

[0009] Another technical solution of the present invention is: a method for airtightness inspection of a one-way valve before welding, the method including an airtightness inspection step of the left valve core: Insert two rubber rings into the two sealing grooves inside the sleeve, and put the sleeve on the right side of the one-way valve. The sleeve is limited by the clamp inside the sleeve and the step surface of the one-way valve. Insert the gasket and hex bolt into the check valve in sequence, and tighten the hex bolt to the limit position to open the right valve core; Insert the rubber ring into the sealing groove on the right end face of the sleeve, and tighten the right outer nut into the threaded connection of the sleeve. Insert the rubber ring into the sealing groove of the left connector, screw the left connector and the left outer nut into the left end of the one-way valve before welding, and vent air through the right adapter interface to check the airtightness of the left valve core.

[0010] Steps for checking the airtightness of the right valve core: Remove the right adapter and right outer nut, remove the gasket and hex bolt from the check valve, and put the right valve core in the closed position; Insert the rubber ring into the sealing groove of the right connector and tighten it using the threaded connection of the right outer nut. A push rod is installed on the left end of the check valve. The large end of the push rod is inserted into the groove of the left rotary joint. The rubber ring is inserted into the sealing groove of the left rotary joint. The left rotary joint and the left outer sleeve nut are screwed into the left end of the check valve. Air is introduced from the right rotary joint interface to check the airtightness of the right valve core.

[0011] Compared with the prior art, the present invention has the following advantages: (1) The present invention utilizes the sleeve and rubber ring to achieve sealing of the weld before welding, thereby enabling the airtightness of the double valve core to be pre-checked before welding. If the airtightness is not up to standard, it can be disassembled, repaired, and reassembled, effectively solving the problem that products with unsatisfactory airtightness after welding cannot be disassembled.

[0012] (2) This invention utilizes a pull-out device and a push rod to separately inspect the left and right valve cores for airtightness, which can accurately locate the location of airtight leakage, facilitate rework, and improve the first-pass yield rate of airtightness inspection after product welding. It has the advantages of simple structure, reliable sealing, and novel structure. Attached Figure Description

[0013] Figure 1 This is an assembly cross-sectional view of the airtightness inspection device for the one-way valve before welding, according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the upper sleeve structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the top rod structure according to an embodiment of the present invention; Figure 4(a) is a schematic diagram of the structure of the pad block according to an embodiment of the present invention; Figure 4(b) is a cross-sectional view of Figure 4(a) using section AA. Figure 5(a) is a schematic diagram of the internal hexagonal bolt according to an embodiment of the present invention; Figure 5(b) is a BB cross-sectional view of Figure 5(a); Among them, 1-right rotatable connector, 2-left rotatable connector, 3-shield, 4-hex socket head cap screw, 6-top rod, 8-sleeve, 5, 7, 9-11: rubber rings, 12-right outer nut, 13-left outer nut Detailed Implementation The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0014] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0015] This invention overcomes the problem that airtightness checks cannot be performed on check valves before welding in the prior art, and provides a simple, reliable, novel, and highly adaptable airtightness check device for check valves before welding.

[0016] like Figure 1As shown, the airtightness inspection device for the one-way valve before welding of the present invention includes an enveloping sleeve 8, a right outer nut 12, a right adapter 1, a left adapter 2, a left outer nut 13, a push rod 6, a pull-opening device, and rubber rings 5, 7, 9-11. The inner hole of sleeve 8 has two sealing grooves, which are referred to as the first sealing groove and the second sealing groove from left to right; there is a sealing groove on the right end face, which is referred to as the third sealing groove; there is a clamp in the inner hole, which is located between the second sealing groove and the third sealing groove; sleeve 8 is used to fit on the outside of the pre-welding check valve and to seal with the pre-welding check valve. The clamp inside sleeve 8 is located on the right side of the step surface of the pre-welding check valve for limiting movement; The left end plane and inner hole of the right outer nut 12 are sealing surfaces, forming a threaded connection structure. The left end plane of the right outer nut 12 is sealed to the right end plane of the sleeve 8, and the inner hole of the right outer nut 12 is sealed to the right adapter 1. At the same time, the right adapter 1 is sealed to the right end interface of the one-way valve before welding. The right adapter 1 has a vent hole in the middle for venting the right valve core. The left outer nut 13 is connected to the outside of the left end interface of the one-way valve before welding and the left rotary joint 2, while the left rotary joint 2 is sealed to the left end interface of the one-way valve before welding. The left-hand joint 2 has a vent hole in the middle and a positioning groove for the push rod 6 on the end face; one end of the push rod 6 is connected to the left-hand joint 2 and is used to introduce the gas through the left-hand joint 2 into the valve seat of the left end of the one-way valve before welding, and the other end is used to push open the left valve core. The pull-out device is connected to the right valve core and is used to introduce the gas that has passed through the right valve core of the check valve before welding into the inside of the check valve.

[0017] The appropriate spacing between the first sealing groove, the second sealing groove, and the clamp ensures that the two unwelded seams of the check valve are located between the first and second sealing grooves, and between the second sealing groove and the clamp, respectively, thus sealing the two unwelded seams of the check valve separately.

[0018] The present invention also provides a method for airtightness inspection of a one-way valve before welding, the method including airtightness inspection steps for the left valve core and the right valve core.

[0019] The steps for checking the airtightness of the left valve core are as follows: Insert two rubber rings 7 into the two sealing grooves in the inner hole of the sleeve 8, and put the sleeve 8 on the right side of the one-way valve. The sleeve 8 is limited by the inner clamp and the step surface of the one-way valve. Insert the pad 3 and the hex bolt 4 into the one-way valve in sequence, and tighten the hex bolt 4 to the limit position to open the right valve core; Insert the rubber ring 10 into the sealing groove on the right end face of the sleeve 8 and tighten it by connecting the right outer nut 12 with the thread. Insert the rubber ring 5 into the sealing groove of the left connector 2, screw the left connector 2 and the left outer nut 13 into the left end of the one-way valve before welding, and vent through the right adapter 1 interface to check the air tightness of the left valve core; do not install the top rod 6 at this time.

[0020] After the airtightness test is completed, the airtightness of the right valve core is checked. The steps for checking the airtightness of the right valve core are as follows: Disassemble the rest of the test apparatus except for sleeve 8. Remove right adapter 1 and right outer nut 12. Remove pad 3 and internal hex bolt 4 from the check valve so that the right valve core is in the closed position. Insert rubber rings 9 and 11 into the sealing groove of the right connector 1 and tighten them by threading the right outer nut 12. A push rod 6 is installed on the left end of the check valve. The large end of the push rod 6 is inserted into the groove of the left rotary joint 2. The rubber ring 5 is inserted into the sealing groove of the left rotary joint 2. The left rotary joint 2 and the left outer nut 13 are screwed into the left end of the check valve. Air is introduced from the interface of the right rotary joint 1 to check the air tightness of the right valve core. The airtightness inspection device of this invention can be widely used in the field of airtightness inspection before welding of one-way valves. It has the advantages of simple structure, reliable sealing and novel structure.

[0021] like Figure 2 As shown, the inner hole of sleeve 8 has two sealing grooves, and the right end face has one sealing groove, which is used to seal the unwelded weld. There is a clamp in the inner hole, and the left large end face of the right outer sleeve nut 12 axially limits the sleeve 8.

[0022] like Figure 3 As shown, the push rod 6 has a stepped structure, consisting of a large-diameter section and a small-diameter section. The small-diameter section is used for positioning and docking with the left valve core, while the large-diameter section cooperates with the left rotary connector 2 for positioning. Under the push of the left rotary connector 2, the left valve core is opened. The large-diameter section has a vent hole to guide air from the left rotary connector 2 into the left end valve seat of the one-way valve before welding, preventing the formation of a closed cavity. The small step on the right end and the large step on the left end of the push rod 6 are radially positioned to prevent the push rod 6 from shaking. The large step has vent holes drilled on it; the number and form of the holes are not limited, ensuring smooth airflow. The length of the large step is limited according to the valve core stroke to ensure that the left valve core can be opened.

[0023] The pull-opening device includes a pad 3 and an internal hex bolt 4; As shown in Figures 4(a) and 4(b), the inner hole of the pad 3 is a stepped hole. The small hole is connected to the threaded connection 4 to limit the end face of the hexagon socket bolt 4. The large hole is connected to the small end of the right valve core to limit the end face of the right valve core. The hexagon socket bolt 4 passes through the pad 3 and is connected to the right valve core. Tightening the hexagon socket bolt 4 is used to lift the right valve core and put the right valve core in the open position to ensure smooth passage and to test the airtightness of the left valve core. As shown in Figures 5(a) and 5(b), the left end of the internal hex bolt 4 has a threaded structure, which is used to tighten the valve core by engaging with the right end of the process thread. When the valve core is opened, the left end face is designed with an internal hex structure for tightening with a wrench.

[0024] The aforementioned one-way valve pre-welding airtightness inspection device uses a pull-out device pad and internal hex bolts to pull open and fix the right valve core, and seals the unwelded weld seam through a sleeve to achieve airtightness inspection of the left valve core.

[0025] The aforementioned one-way valve pre-welding airtightness inspection device has a top rod that is precisely positioned by the left rotary joint, which ensures that the left valve core is in the open position and prevents the small end of the left valve core from contacting the large end of the right valve core. The sleeve seals the unwelded weld seam, thus enabling the airtightness inspection of the right valve core.

[0026] Furthermore, the right outer sleeve of the aforementioned one-way valve pre-welding airtightness inspection device is fitted with a nut and sleeve to achieve a seal on the unwelded parts.

[0027] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0028] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A device for checking the airtightness of a one-way valve before welding, characterized in that, Includes sleeve (8), right outer nut (12), right adapter (1), left adapter (2), left outer nut (13), left adapter (2), push rod (6) and pull-opening device; The inner hole of the sleeve (8) has two sealing grooves, which are referred to as the first sealing groove and the second sealing groove from left to right; there is a sealing groove on the right end face, which is referred to as the third sealing groove; there is a clamp in the inner hole, which is located between the second sealing groove and the third sealing groove; the sleeve (8) is used to fit on the outside of the one-way valve before welding and to seal with the one-way valve before welding. The clamp inside the sleeve (8) is located on the right side of the step surface of the one-way valve before welding for limiting the position; The left end plane and inner hole of the right outer nut (12) are sealing surfaces. The left end plane of the right outer nut (12) is sealed to the right end plane of the sleeve (8). The inner hole of the right outer nut (12) is sealed to the right adapter (1). At the same time, the right adapter (1) is sealed to the right end interface of the one-way valve before welding. The right adapter (1) has a vent hole in the middle for venting the right valve core. The left outer nut (13) is connected to the outside of the left end interface of the check valve before welding and the left rotary joint (2), while the left rotary joint (2) is sealed to the left end interface of the check valve before welding. The left-hand joint (2) has a vent hole in the middle and a positioning groove for the push rod (6) on the end face; one end of the push rod (6) is connected to the left-hand joint (2) and is used to introduce the gas through the left-hand joint (2) into the valve seat of the left end of the one-way valve before welding, and the other end is used to open the left valve core. The pull-out device is connected to the right valve core and is used to introduce the gas that has passed through the right valve core of the check valve before welding into the inside of the check valve.

2. The airtightness inspection device for a one-way valve before welding according to claim 1, characterized in that, The push rod (6) is a stepped structure, consisting of a large diameter section and a small diameter section. The small diameter section is used to position and dock with the left valve core, and the large diameter section is used to position with the left rotary joint (2). Under the push of the left rotary joint (2), the left valve core is opened. The large diameter section has a vent hole, which is used to introduce the vent of the left rotary joint (2) into the valve seat at the left end of the one-way valve before welding.

3. The airtightness inspection device for a one-way valve before welding according to claim 1, characterized in that, The pull-opening device includes a pad (3) and an internal hex bolt (4); The inner hole of the pad (3) is a stepped hole. The small hole is connected to the threaded connection (4) to limit the end face of the internal hexagon bolt (4). The large hole is connected to the small end of the right valve core to limit the end face of the right valve core. The internal hexagon bolt (4) passes through the pad (3) and is connected to the right valve core. Tightening the internal hexagon bolt (4) is used to lift the right valve core so that the right valve core is in the open position.

4. The airtightness inspection device for a one-way valve before welding according to claim 1, characterized in that, The appropriate spacing between the first sealing groove, the second sealing groove, and the clamp ensures that the two unwelded seams of the check valve are located between the first and second sealing grooves, and between the second sealing groove and the clamp, respectively, thus sealing the two unwelded seams of the check valve separately.

5. A method for checking the airtightness of a one-way valve before welding, characterized in that... Including the airtightness check procedure for the left valve core: S1. Insert two rubber rings into the two sealing grooves in the inner hole of the sleeve (8), and put the sleeve (8) on the right side of the one-way valve. The sleeve (8) is limited by the clamp inside the sleeve (8) and the step surface of the one-way valve. S2. Insert the pad (3) and the internal hex bolt (4) into the one-way valve in sequence, and tighten the internal hex bolt (4) to the limit position to open the right valve core. S3. Insert the rubber ring into the sealing groove on the right end face of the sleeve (8), and tighten the right outer nut (12) by threading it into the sleeve (8); S4. Insert the rubber ring into the sealing groove of the left connector (2), screw the left connector (2) and the left outer nut (13) into the left end of the one-way valve before welding, and vent through the right adapter (1) interface to check the air tightness of the left valve core.

6. The method for checking the airtightness of a one-way valve before welding according to claim 5, characterized in that... It also includes a procedure for checking the airtightness of the right valve core: S5. Remove the right adapter (1) and the right outer nut (12), remove the pad (3) and the internal hex bolt (4) from the check valve, so that the right valve core is in the closed position; S6. Insert the rubber ring into the sealing groove of the right connector (1) and tighten it through the threaded connection of the right outer nut (12); S7. Install the top rod (6) on the left end of the one-way valve. Insert the large end of the top rod (6) into the groove of the left rotary joint (2). Insert the rubber ring into the sealing groove of the left rotary joint (2). Screw the left rotary joint (2) and the left outer nut (13) into the left end of the one-way valve. Air is supplied from the interface of the right rotary joint (1) to check the air tightness of the right valve core.

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