Air tightness detection device for valve casting

Abstract

The invention relates to the technical field of detection, in particular to a valve casting airtightness detection device which comprises a water tank, clear water is contained in the water tank, a tank cover is hinged to the top end of the water tank, an electric cylinder is installed on the tank cover, and an action rod of the electric cylinder extends into the water tank and is provided with a pressing seat. A lower pressing seat assembly is installed at the bottom of the water tank, the lower pressing seat and the pressing seat are located on the same vertical line, a side pressing seat assembly is installed on the cavity wall of the water tank, two positioning rods are arranged in the water tank, and the two positioning rods are located on one side of the center of the water tank and are vertically upward; the three-way valve casting is vertically placed in the water tank, a first valve port of the three-way valve vertically faces the pressing seat upwards, the air tightness difference of the valve port is obtained according to bubbles, and detection is completed. The gas source used during detection is obtained by descending the second detection seat, and no gas source equipment needs to be additionally arranged on one side of the water tank, so that the space is saved, and the efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to an air tightness detection device for valve castings. Background Art

[0002] After the valve casting is completed, the air tightness test of the valve opening is required. The Chinese patent with application number 202220971106.6 discloses an air tightness test device for valve castings, including a water tank and a test component. When in use, water is injected into the water tank, and then the valve is placed in the water tank, and gas is introduced to complete the test. From its disclosed structure, it can be seen that it has only two air pipes, so it can only be adapted to two-way valve detection. When it is aimed at three-way valve detection, at least one detection part is missing; the gas source used needs to be supplied by an external third-party gas supply device, which occupies a large space and has low detection efficiency. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an air tightness detection device for valve castings, comprising a water tank, wherein the water tank is filled with clean water, a box cover is hinged on the top of the water tank, an electric cylinder is installed on the box cover, an action rod of the electric cylinder extends into the water tank and is installed with a pressure seat, a lower pressure seat assembly is installed at the bottom of the water tank, the lower pressure seat and the pressure seat are on the same vertical line, a side pressure seat assembly is installed on the cavity wall of the water tank, two positioning rods are arranged in the water tank, the two positioning rods are located on one side of the center of the water tank and vertically upward; a three-way valve casting is vertically placed in the water tank, a first valve port on the three-way valve faces the pressure seat vertically upward, a second valve port on the three-way valve falls vertically downward on the lower pressure seat assembly, and a third valve port on the three-way valve is located above the side pressure seat assembly and is positioned between the two positioning rods;

[0004] The side pressure seat assembly includes a first positioning tube fixed on the water tank cavity wall and a first detection seat slidably fitted on the first positioning tube, the first detection seat is on the same side as the two positioning rods, and is horizontally and perpendicularly between the two positioning rods, the first detection seat is provided with a first large diameter portion at one end close to the positioning rod, the first detection seat and the first positioning tube are sleeved with a first spring, and the two ends of the first spring elastically abut between the first large diameter portion and the cavity wall of the water tank;

[0005] The lower pressure seat assembly includes a second positioning tube fixed to the bottom of the water tank and a second detection seat slidably fitted in the second positioning tube, the top of the second detection seat is close to the first detection seat, the top of the second detection seat is provided with a second large diameter portion, the second positioning tube and the second detection seat are sleeved with a second spring, the two ends of the second spring elastically abut between the second large diameter portion and the bottom of the water tank cavity, the bottom end of the second positioning tube is closed and the top end is open, the bottom end of the second detection seat is provided with a piston, the pressure seat is a cavity, the air outlet pipe is connected to the cavity of the pressure seat, the pressure seat and the second positioning tube are connected by a pipeline, and when the piston descends, the second positioning tube generates gas and the gas is transported to the pressure seat through the pipeline.

[0006] As a further preferred embodiment, the piston is located in the second positioning tube, a gas tank is provided outside the water tank, and the pipeline includes an air inlet pipe connected between the second positioning tube and the gas tank, and also includes an air outlet pipe connected between the gas tank and the pressure seat.

[0007] As a further preferred embodiment, a support frame is fixed outside the water tank, the bottom end of the second positioning tube vertically passes through the bottom surface of the water tank downward, and the air inlet pipe is connected to the bottom end of the second positioning tube.

[0008] As a further preference, a switch valve is installed on the air outlet pipe, and a gas one-way valve is installed on the air inlet pipe.

[0009] As a further preferred embodiment, a chamfer is formed on the first large diameter portion, and the chamfer faces and is close to the two positioning rods.

[0010] As a further preferred embodiment, a pull plate is fixed on each of the two positioning rods, a gas spring is connected between the two pull plates, the gas spring is located below the side pressure seat assembly, a slide rail is commonly installed at the bottom ends of the two positioning rods, and the bottom surface of the slide rail is fixed on the bottom of the water tank cavity.

[0011] As a further preferred embodiment, the box cover is transferred to the water tank, a through hole is opened on the box cover, a locking sleeve is fixed in the through hole, the air outlet pipe passes through the locking sleeve into the water tank, and is connected to the pressure seat.

[0012] As a further preference, the end surfaces of the first detection seat, the second detection seat and the pressure seat are all inlaid with rubber seats.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] When the pressure seat pushes the top of the three-way valve to make the three-way valve descend in the water tank, first, the bottom surface of the pressure seat is buckled on the top surface of the first valve port, and the rubber seat on the bottom surface of the pressure seat is used to form a sealing effect in the cavity of the pressure seat. Second, as the three-way valve descends, the bottom surface of the third valve port and the rubber seat on the top surface of the second large diameter portion form a sealing effect, and the second spring is compressed and shortened; third, as the three-way valve continues to descend, it not only pushes the second detection seat to slide downward along the lumen of the second positioning tube, but also uses the descending action of the piston to make the lumen of the second positioning tube produce an air pressure effect, and injects the gas in the second positioning tube into the gas tank through the air inlet pipe; third, the third valve port on the side of the three-way valve is lowered to the first large diameter portion, and the first large diameter portion pushes the first detection seat to move outward along the first positioning tube by extruding the chamfer until the third valve port is completely overlapped with the first large diameter portion, and the first spring is compressed and shortened. The present invention is directed to the rapid docking of each valve port of the three-way valve with each detection orientation before the air tightness detection. When the second detection seat slides downward along the lumen of the second positioning tube, the gas formed in the gas tank can be used for the air tightness detection of the above-mentioned valve ports. The specific principle is: at this time, the switch valve is opened, and the pressurized gas in the gas tank is discharged from the outlet pipe into the cavity of the pressure seat, and then sent into the three-way valve from the cavity of the pressure seat. Since the three valve ports of the three-way valve are all in a sealed state, and the three-way valve is submerged in water when placed in the water tank, when gas is injected into the three-way valve, if one of the valve ports leaks, bubbles will be generated at that position. According to the bubbles, it is known that the air tightness of this valve port is poor, and the detection is completed. The source of the gas used in the detection is obtained by the descent of the second detection seat, and there is no need to add gas source equipment on one side of the water tank, which saves space and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a valve casting air tightness detection device provided by an embodiment of the present invention, after partial sectioning, with a three-way valve placed in a water tank for detection;

[0016] Figure 2 An air tightness detection device for a valve casting provided in an embodiment of the present invention comprises Figure 1 A schematic diagram after being cut open from another perspective;

[0017] Figure 3 A schematic diagram of an air tightness detection device for a valve casting provided by an embodiment of the present invention when a three-way valve is removed;

[0018] Figure 4 An air tightness detection device for a valve casting provided in an embodiment of the present invention comprises Figure 3 The enlarged schematic diagram of the A part is shown;

[0019] Figure 5 A schematic diagram of the external structure of an air tightness detection device for a valve casting provided in an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of a valve casting air tightness detection device provided by an embodiment of the present invention from a back perspective;

[0021] Figure 7 A schematic diagram of only a three-way valve in an air tightness detection device for a valve casting provided in an embodiment of the present invention.

[0022] In the figure: 1, water tank; 2, tank cover; 3, electric cylinder; 4, pressure seat; 5, lower pressure seat assembly; 6, side pressure seat assembly; 7, positioning rod; 8, first positioning tube; 9, first detection seat; 10, first large diameter portion; 11, chamfer; 12, first spring; 13, second positioning tube; 14, second detection seat; 15, second large diameter portion; 16, second spring; 17, piston; 18, gas tank; 19, air inlet pipe; 20, air outlet pipe; 21, support frame; 22, switch valve; 23, gas one-way valve; 24, pull plate; 25, gas spring; 26, slide rail; 27, perforation; 28, locking sleeve; 29, first valve port; 30, second valve port; 31, third valve port; 32, rubber seat. DETAILED DESCRIPTION

[0023] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0024] In one embodiment, Figure 1-Figure 7 As shown:

[0025] The present embodiment provides an air tightness detection device for valve castings, including a water tank 1, wherein the water tank 1 is filled with clean water, a box cover 2 is hingedly connected to the top of the water tank 1, an electric cylinder 3 is installed on the box cover 2, an action rod of the electric cylinder 3 extends into the water tank 1 and is installed with a pressure seat 4, a lower pressure seat assembly 5 is installed at the bottom of the water tank 1, the lower pressure seat assembly 5 and the pressure seat 4 are on the same vertical line, a side pressure seat assembly 6 is installed on the cavity wall of the water tank 1, two positioning rods 7 are arranged in the water tank 1, and the two positioning rods 7 are located on one side of the center of the water tank 1 and vertically upward; the three-way valve casting is vertically placed in the water tank 1, the first valve port 29 on the three-way valve faces the pressure seat 4 vertically upward, the second valve port 30 on the three-way valve falls vertically downward on the lower pressure seat assembly 5, and the third valve port 31 on the three-way valve is located above the side pressure seat assembly 6 and is positioned between the two positioning rods 7;

[0026] The side pressure seat assembly 6 includes a first positioning tube 8 fixed on the cavity wall of the water tank 1 and a first detection seat 9 slidably fitted on the first positioning tube 8. The first detection seat 9 is on the same side as the two positioning rods 7 and is horizontally perpendicular to the two positioning rods 7. The first detection seat 9 is provided with a first large diameter portion 10 at one end close to the positioning rod 7. The first detection seat 9 and the first positioning tube 8 are sleeved with a first spring 12, and the two ends of the first spring 12 elastically contact between the first large diameter portion 10 and the cavity wall of the water tank 1; when the three-way valve descends with the third valve port 31, the third valve port 31 descends along between the two positioning rods 7, and the two positioning rods 7 form a positioning for the third valve port 31, first, to ensure that the third valve port 31 is overlapped with the side pressure seat assembly 6 on the same horizontal straight line after descending, second, to ensure that the first valve port 29 and the pressure seat 4 are on the same vertical line, and third, to ensure that the second valve port 30 and the second detection seat 14 are on the same vertical line.

[0027] The lower pressure seat assembly 5 includes a second positioning tube 13 fixed at the bottom of the water tank 1 and a second detection seat 14 slidingly fitted in the second positioning tube 13. The top of the second detection seat 14 is close to the first detection seat 9. The top of the second detection seat 14 is provided with a second large diameter portion 15. The second positioning tube 13 and the second detection seat 14 are sleeved with a second spring 16. The two ends of the second spring 16 elastically interfere with the second large diameter portion 15 and the bottom of the water tank 1. The bottom end of the second positioning tube 13 is closed and the top end is open. The bottom end of the second detection seat 14 is provided with a piston 17. The pressure seat 4 is a cavity. The air outlet pipe 20 is connected to the cavity of the pressure seat 4. The pressure seat 4 and the second positioning tube 13 are connected by a pipeline. When the piston 17 descends, the second positioning tube 13 generates gas and the gas is transported to the pressure seat 4 through the pipeline.

[0028] The piston 17 is located in the second positioning tube 13 , and an air tank 18 is provided outside the water tank 1 . The pipeline includes an air inlet pipe 19 connected between the second positioning tube 13 and the air tank 18 , and also includes an air outlet pipe 20 connected between the air tank 18 and the pressure seat 4 .

[0029] A support frame 21 is fixed outside the water tank 1 , the bottom end of the second positioning tube 13 vertically passes through the bottom surface of the water tank 1 downward, and the air inlet pipe 19 is connected to the bottom end of the second positioning tube 13 .

[0030] A chamfer 11 is formed on the first large diameter portion 10 , and the chamfer 11 faces and is close to the two positioning rods 7 .

[0031] A pull plate 24 is fixed on both positioning rods 7, and a gas spring 25 is connected between the two pull plates 24. The gas spring 25 is located below the side pressure seat assembly 6. A slide rail 26 is installed at the bottom of the two positioning rods 7, and the bottom surface of the slide rail 26 is fixed on the bottom of the water tank 1. The gas spring 25 is provided so that the distance between the two pull plates 24 can be adjusted, and the two pull plates 24 can also adjust the spacing between the two positioning rods 7. For the third valve ports 31 of different pipe diameters, the two positioning rods 7 can adjust the spacing according to the pipe diameter of the third valve ports 31 to meet the positioning of the third valve ports 31 of different pipe diameters.

[0032] The box cover 2 is connected to the water tank 1. A through hole 27 is opened on the box cover 2. A locking sleeve 28 is fixed in the through hole 27. The air outlet pipe 20 passes through the locking sleeve 28 and enters the water tank 1, and is connected to the pressure seat 4. When the box cover 2 is closed, the pressure seat 4 is aligned with the first valve port 29 on the top of the three-way valve. When gas is injected into the pressure seat 4, the gas is poured into the valve cavity from the first valve port 29.

[0033] The end surfaces of the first detection seat 9 , the second detection seat 14 and the pressure seat 4 are all inlaid with rubber seats 32 .

[0034] Working principle and effect: Figure 1As shown, the box cover 2 is opened upwards, and the three-way valve is inserted into the water tank 1 from the top of the water tank 1 downwards. Before insertion, the third valve port 31 is clamped between the two positioning rods 7, and the third valve port 31 is positioned by the two positioning rods 7 to ensure that the third valve port 31 is in the same straight line with the first detection seat 9, and the second valve port 30 is in the same straight line with the second detection seat 14. Under the action of gravity and the limiting action of the two positioning rods 7, when the three-way valve is fully inserted into the water tank 1, the second valve port 30 at the bottom thereof falls on the second large diameter portion 15 at the top of the second detection seat 14. At this time, the box cover 2 is closed, and the electric cylinder 3 brings the pressure seat 4 to be vertically aligned. The pressure seat 4 is in the same vertical line with the first valve port 29 on the three-way valve. The electric cylinder 3 is started to push the pressure seat 4 down, and the bottom surface of the pressure seat 4 falls on the first valve port 29 and pushes the three-way valve down. At this time, three technical effects will be produced. First, the bottom surface of the pressure seat 4 is buckled on the top surface of the first valve port 29 First, the rubber seat 32 on the bottom surface of the pressure seat 4 is used to form a sealing effect in the cavity of the pressure seat 4. Second, as the three-way valve descends, the bottom surface of the third valve port 31 forms a sealing effect with the rubber seat 32 on the top surface of the second large diameter portion 15, and the second spring 16 is compressed and shortened; third, as the three-way valve continues to descend, it not only pushes the second detection seat 14 to slide downward along the lumen of the second positioning tube 13, but also uses the descending action of the piston 17 to make the lumen of the second positioning tube 13 produce an air pressure effect, and injects the gas in the second positioning tube 13 into the gas tank 18 through the air inlet pipe 19; third, the third valve port 31 on the side of the three-way valve is lowered to the first large diameter portion 10, and the first large diameter portion 10 pushes the first detection seat 9 to move outward along the first positioning tube 8 by squeezing the chamfer 11, until the third valve port 31 is completely overlapped with the first large diameter portion 10, and the first spring 12 is compressed and shortened. The present invention is aimed at the rapid docking of each valve port of the three-way valve with each detection orientation before the air tightness detection.

[0035] Continuing from the above, when the second detection seat 14 slides downward along the lumen of the second positioning tube 13, gas will be generated, and the gas will enter the gas tank 18 through the air inlet pipe 19 under the action of air pressure. These gases can be used for the air tightness detection of the above-mentioned valve ports. The specific use principle is: open the switch valve 22 on the air outlet pipe 20, and the pressurized gas in the gas tank 18 is quickly released into the cavity of the pressure seat 4 through the air outlet pipe 20. At this time, the electric cylinder 3 is powered off and no longer pushes the three-way valve down through the pressure seat 4, and the high-pressure gas The gas is sent into the three-way valve from the cavity of the pressure seat 4. Since the three valve ports of the three-way valve are all in a sealed state, and the three-way valve is submerged in water when placed in the water tank 1, when high-pressure gas is injected into the three-way valve, if one of the valve ports (the first valve port 29, the second valve port 30, and the third valve port 31) on the three-way valve leaks, bubbles will be generated at that position. The water tank 1 is made of transparent glass or transparent plastic. By observing the position of the bubble with the naked eye, it is known that the air tightness of a certain valve port is poor, and the detection process is completed. In summary, the gas used is obtained by the second detection seat 14 descending along the second positioning tube 13 in the second positioning tube 13. There is no need to add an air source device on one side of the water tank 1, which saves space. In addition, the method of squeezing and pushing the three-way valve down not only allows each valve port to form a quick docking with each detection position, but also can synchronously provide a gas source to the second positioning tube 13. The two tasks of storing gas and detecting docking do not need to be completed step by step, which improves work efficiency.

[0036] After the detection is completed, the electric cylinder 3 is energized and moves up with the pressure seat 4 in the opposite direction. The top valve port (first valve port 29) of the three-way valve loses pressure, and the pressure at the bottom valve port (second valve port 30) gradually decreases. The second spring 16 changes from compression to elastic elongation, and uses the top end to push the second large diameter portion 15 to rise, and the second large diameter portion 15 pushes the second detection seat 14 to rise and reset. At the same time, the third valve port 31 rises along the inner end surface of the first large diameter portion 10, so that the pressure on the first detection seat 9 is gradually reduced, the first spring 12 rebounds, and the first large diameter portion 10 pushes the first detection seat 9 to reset inward, the box cover 2 is opened to take out the three-way valve, and the detection is completed.

[0037] Of course, another set of side pressure seat assembly 6 is symmetrically arranged on the other side of the water tank 1. When the four-way valve is tested, the four-way valve is placed in the water tank 1. In addition to the upper and lower valve ports being extruded and docked with the pressure seat 4 and the second detection seat 14 in the same manner as described above, the valve ports on both sides of the four-way valve can also be docked with the first detection seats 9 on the pressure seat assemblies 6 on both sides in the same manner as described above. It can be seen that the present invention can also perform rapid testing on the air tightness of the four-way valve port by symmetrically arranging another set of side pressure seat assemblies 6.

[0038] like Figure 2As shown, a switch valve 22 is installed on the air outlet pipe 20, and a gas one-way valve 23 is installed on the air inlet pipe 19. When the piston 17 descends and gas is generated in the second positioning pipe 13, the gas one-way valve 23 is closed. When the gas pressure in the second positioning pipe 13 is greater than the rated opening pressure of the gas one-way valve 23, the gas will break through the gas one-way valve 23 and enter the gas tank 18.

[0039] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0040] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air tightness detection device for valve castings, characterized in that: The invention comprises a water tank (1), wherein the water tank (1) is filled with clean water, a tank cover (2) is hingedly connected to the top of the water tank (1), an electric cylinder (3) is installed on the tank cover (2), an actuating rod of the electric cylinder (3) extends into the water tank (1) and is installed with a pressure seat (4), a lower pressure seat assembly (5) is installed at the bottom of the water tank (1), the lower pressure seat assembly (5) and the pressure seat (4) are on the same vertical line, a side pressure seat assembly (6) is installed on the cavity wall of the water tank (1), and the water tank ( 1) is provided with two positioning rods (7), the two positioning rods (7) are located on one side of the center of the water tank (1) and are vertically upward; the three-way valve casting is vertically placed in the water tank (1), the first valve port (29) on the three-way valve is vertically upward facing the pressure seat (4), the second valve port (30) on the three-way valve is vertically downward falling on the lower pressure seat assembly (5), and the third valve port (31) on the three-way valve is located above the side pressure seat assembly (6) and is positioned between the two positioning rods (7); The side pressure seat assembly (6) comprises a first positioning tube (8) fixed on the cavity wall of the water tank (1) and a first detection seat (9) slidably fitted on the first positioning tube (8); the first detection seat (9) is on the same side as the two positioning rods (7) and is horizontally and perpendicularly disposed between the two positioning rods (7); a first large diameter portion (10) is provided at one end of the first detection seat (9) close to the positioning rods (7); a first spring (12) is sleeved on the first detection seat (9) and the first positioning tube (8); two ends of the first spring (12) elastically abut between the first large diameter portion (10) and the cavity wall of the water tank (1); The lower pressure seat assembly (5) comprises a second positioning tube (13) fixed to the bottom of the water tank (1) and a second detection seat (14) slidably fitted in the second positioning tube (13), the top end of the second detection seat (14) is close to the first detection seat (9), the top end of the second detection seat (14) is provided with a second large diameter portion (15), the second positioning tube (13) and the second detection seat (14) are sleeved with a second spring (16), the two ends of the second spring (16) elastically abut against the second large diameter portion (15). The bottom end of the second positioning tube (13) is closed and the top end is open between the diameter portion (15) and the bottom of the water tank (1). A piston (17) is provided at the bottom end of the second detection seat (14). The pressure seat (4) is a cavity. The air outlet pipe (20) is connected to the cavity of the pressure seat (4). The pressure seat (4) and the second positioning tube (13) are connected via a pipeline. When the piston (17) descends, the second positioning tube (13) generates gas, and the gas is transported to the pressure seat (4) via the pipeline.

2. The air tightness detection device for valve casting according to claim 1, characterized in that: The piston (17) is located in the second positioning tube (13), and a gas tank (18) is provided outside the water tank (1). The pipeline includes an air inlet pipe (19) connected between the second positioning tube (13) and the gas tank (18), and also includes an air outlet pipe (20) connected between the gas tank (18) and the pressure seat (4).

3. The air tightness detection device for valve casting according to claim 2, characterized in that: A support frame (21) is fixed outside the water tank (1), the bottom end of the second positioning tube (13) vertically passes through the bottom surface of the water tank (1), and the air intake pipe (19) is connected to the bottom end of the second positioning tube (13).

4. The air tightness detection device for valve casting according to claim 3, characterized in that: The gas outlet pipe (20) is provided with a switch valve (22), and the gas inlet pipe (19) is provided with a gas check valve (23).

5. The air tightness detection device for valve castings according to claim 4, characterized in that: The first large diameter portion (10) is provided with a chamfer (11), and the chamfer (11) faces and is close to the two positioning rods (7).

6. The air tightness detection device for valve castings according to claim 5, characterized in that: A pull plate (24) is fixed on each of the two positioning rods (7), a gas spring (25) is connected between the two pull plates (24), the gas spring (25) is located below the side pressure seat assembly (6), and a slide rail (26) is commonly installed at the bottom ends of the two positioning rods (7), and the bottom surface of the slide rail (26) is fixed on the bottom of the water tank (1).

7. The air tightness detection device for valve castings according to claim 6, characterized in that: The box cover (2) is connected to the water tank (1), a through hole (27) is provided on the box cover (2), a locking sleeve (28) is fixed in the through hole (27), the air outlet pipe (20) passes through the locking sleeve (28) and enters the water tank (1), and is connected to the pressure seat (4).

8. The air tightness detection device for valve castings according to claim 7, characterized in that: The end surfaces of the first detection seat (9), the second detection seat (14) and the pressure seat (4) are all inlaid with rubber seats (32).

Images