Air valve sealing performance detection device

Abstract

The utility model provides a valve sealing detection device, which relates to the field of valve sealing detection, and comprises a detection device main body, the detection device main body is connected with a cylinder body, the detection device main body comprises an end plate, the upper side of the end plate is connected with a hydraulic rod, the outer side of the hydraulic rod is connected with a fixed plate, and the fixed plate is connected with a piston rod. An electric push rod is installed on the upper side of the fixing plate, a piston block is connected to the lower end of the electric push rod, a second sealing ring is arranged on the outer wall of the piston block, a first branch pipe, a second branch pipe and a first air outlet pipe are slidably inserted into the end plate, and the bottom of the first branch pipe is close to the upper end of the piston block; the second branch pipe and the first air outlet pipe are inserted into the piston block in a penetrating mode, and meanwhile a second air outlet pipe is inserted into the end plate. According to the utility model, the sectional type air tightness detection effect on the air valve is realized, the air leakage point range is conveniently locked, and the effect of detecting a plurality of air valves at the same time is realized.

Description

Technical Field

[0001] This utility model relates to the field of valve sealing performance testing technology, and specifically to a valve sealing performance testing device. Background Technology

[0002] During the intake stroke, the intake valve is open and the exhaust valve is closed, allowing fresh air to enter the combustion chamber and ensuring it remains inside. Poor valve sealing will cause fresh air to leak out, resulting in insufficient fresh air in the combustion chamber and affecting fuel combustion. During the compression stroke, the exhaust valve is sealed to build up cylinder pressure, aiding in fuel combustion. Poor valve sealing will prevent the cylinder pressure from reaching the optimal combustion pressure, affecting the combustion process. During the power stroke, both the intake and exhaust valves are closed to ensure cylinder pressure output and prevent pressure loss due to valve leaks. During the exhaust stroke, the intake valve is closed and the exhaust valve is open, allowing exhaust gases to escape from the exhaust valve and preventing them from flowing back into the intake manifold and contaminating the fresh air. In summary, regardless of the engine's stroke, at least one valve must be closed. Therefore, ensuring valve sealing is crucial for increasing engine power and ensuring normal engine operation.

[0003] A search revealed existing technology (publication number: CN209764361U), which describes "a novel valve sealing performance testing device, comprising a pressure rod and an inverted cup-shaped pressure block disposed below the pressure rod; the lower end face of the pressure block is flush with the assembly plane of the cylinder head, and a sealing ring is provided on its lower end face; the lower end face of the pressure block is used to seal the valve on the assembly plane of the cylinder head, and the upper part of the pressure block has an inflation hole for connecting an inflation device and a pressure measuring hole for connecting a pressure measuring device; a cylindrical fuel injector plug is provided inside the pressure block corresponding to the position of the fuel injector in the cylinder head, and a rubber protective sleeve is installed on the fuel injector plug."

[0004] While existing valve sealing testing devices can detect the airtightness of valves (engine cylinder blocks), they still have some shortcomings: When a leak is detected, the existing valve sealing testing devices cannot quickly locate the location and range of the leak, which requires further investigation and subsequent rectification of valve processing technology or equipment. Secondly, the devices can only test one valve at a time, while a typical engine has multiple valve structures, resulting in low testing efficiency. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, a valve sealing performance testing device is provided to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, a valve sealing performance testing device is provided, comprising: a testing device body connected to a cylinder block, the testing device body including an end plate, a hydraulic rod connected to the upper side of the end plate, a fixing plate connected to the outer side of the hydraulic rod, an electric actuator mounted on the upper side of the fixing plate, a piston block connected to the lower end of the electric actuator, a second sealing ring provided on the outer wall of the piston block, a first branch pipe, a second branch pipe and a first exhaust pipe slidably inserted inside the end plate, the bottom of the first branch pipe being close to the upper end of the piston block, the second branch pipe and the first exhaust pipe being inserted through the piston block, and a second exhaust pipe inserted inside the end plate, the upper ends of the first branch pipe and the second branch pipe being connected to an intake pipe via a tee, and a first pressure gauge and a second pressure gauge respectively connected to the upper ends of the first exhaust pipe and the second exhaust pipe.

[0007] Furthermore, the piston block is slidably connected in the inner cavity of the cylinder, and the outer wall of the piston block is provided with two sets of second sealing rings.

[0008] Furthermore, four sets of first sealing rings are installed on the lower side of the end plate, and the first sealing rings are respectively located on the outer periphery of the upper cavity opening of the cylinder body.

[0009] Furthermore, a first solenoid valve is installed in the first branch pipe, and a second solenoid valve is installed in the second branch pipe. A connecting block is connected between the first branch pipe and the second branch pipe. The first solenoid valve, the second solenoid valve, and the connecting block are all located on the upper side of the end plate.

[0010] Furthermore, the lower ends of both the second branch pipe and the first exhaust pipe pass through the piston block, and their lower ends are connected to the inner cavity of the cylinder.

[0011] Furthermore, the upper end of the air intake pipe is connected to an air intake device via a flexible hose.

[0012] Furthermore, the fixing plate is fixed to the piston rod of the hydraulic rod, and the hydraulic rod is installed upside down.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. In use, first fix the upper end of the hydraulic rod so that the first sealing ring on the lower side of the end plate corresponds one-to-one with the inner cavity of the cylinder. Then, drive the end plate downward with the hydraulic rod until the first sealing ring presses against the upper end face of the cylinder. Then, slide the piston block into the inner cavity of the cylinder with the electric push rod. When the piston block moves close to the bottom of the inner cavity, stop moving. Then, inflate the space under the piston block with air through the air inlet pipe and the second branch pipe. At this time, the internal air pressure is detected by the first air outlet pipe and the first pressure gauge. Then, move the piston block upward a certain distance with the electric push rod and inflate again until the piston block is close to the upper end of the inner cavity of the cylinder. At this time, the space between the piston block and the end plate is inflated with air through the air inlet pipe, the first branch pipe, the second air outlet pipe, and the second pressure gauge. This allows for multiple strokes of detection in the inner cavity of the cylinder, which facilitates the quick determination of the location and range of the leakage point.

[0015] 2. The use of multiple sets of electric actuators and piston blocks, as well as the pipeline structure connected to the upper side of the piston blocks, makes it easy to perform air tightness testing on multiple cylinder cavities at one time. At the same time, it can lock the location range of different leakage points in multiple cylinder cavities, which greatly improves the efficiency of valve testing. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of an embodiment of the present utility model.

[0017] Figure 2 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the structure at point A in the middle.

[0018] Figure 3 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the structure at point B.

[0019] Figure 4 This is a bottom view of the end plate structure according to an embodiment of the present utility model.

[0020] In the diagram: 1. Main body of the detection device; 11. End plate; 12. First sealing ring; 13. Fixing plate; 14. Electric actuator; 141. Piston block; 142. Second sealing ring; 15. Hydraulic rod; 16. Inlet pipe; 161. T-junction; 162. First branch pipe; 163. First solenoid valve; 164. Second branch pipe; 165. Second solenoid valve; 17. First outlet pipe; 171. First pressure gauge; 18. Second outlet pipe; 181. Second pressure gauge; 2. Cylinder body. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figures 1 to 4 As shown, this utility model provides a valve sealing performance testing device, including: a testing device body 1, which is connected to a cylinder body 2. The testing device body 1 includes an end plate 11, and a hydraulic rod 15 is connected to the upper side of the end plate 11. A fixing plate 13 is connected to the outer side of the hydraulic rod 15, and an electric push rod 14 is installed on the upper side of the fixing plate 13. The fixing plate 13 is fixed to the piston rod of the hydraulic rod 15, and the hydraulic rod 15 is installed inverted. A piston block 141 is connected to the lower end of the electric push rod 14, and a second sealing ring 1 is provided on the outer wall of the piston block 141. 42. A first branch pipe 162, a second branch pipe 164, and a first air outlet pipe 17 are slidably inserted into the end plate 11. The bottom of the first branch pipe 162 is close to the upper end of the piston block 141. The second branch pipe 164 and the first air outlet pipe 17 are inserted through the piston block 141. At the same time, a second air outlet pipe 18 is inserted into the end plate 11. The upper ends of the first branch pipe 162 and the second branch pipe 164 are connected to the air inlet pipe 16 through the tee 161. The upper ends of the first air outlet pipe 17 and the second air outlet pipe 18 are respectively connected to the first pressure gauge 171 and the second pressure gauge 181.

[0023] In this embodiment, the cylinder block 2 is a valve combustion cylinder structure of an engine, and during use, it is also equipped with structures such as pistons and crank connecting rods.

[0024] Specifically, the upper end of the hydraulic rod 15 can be fixedly installed with the bracket, and there is a gap between the top of the bracket and the top of the electric actuator 14. At the same time, the electric actuator 14 is also installed in an inverted position.

[0025] Specifically, the sliding connections between the first branch pipe 162, the second branch pipe 164, and the first vent pipe 17 and the end plate 11 are all made of sealing rings to ensure sealing during sliding.

[0026] Specifically, both the first branch pipe 162 and the second branch pipe 164 are equipped with one-way valves.

[0027] like Figures 1 to 4In the cylinder 2, piston block 141 is slidably connected to the inner cavity of cylinder 2, and two sets of second sealing rings 142 are provided on the outer wall of piston block 141. Four sets of first sealing rings 12 are installed on the lower side of end plate 11, and the first sealing rings 12 are respectively located on the outer periphery of the upper cavity opening of the inner cavity of cylinder 2. A first solenoid valve 163 is installed in the pipeline of the first branch pipe 162, and a second solenoid valve 165 is installed in the pipeline of the second branch pipe 164. A connecting block is connected between the first branch pipe 162 and the second branch pipe 164. The first solenoid valve 163, the second solenoid valve 165 and the connecting block are all located on the upper side of end plate 11. The lower ends of the second branch pipe 164 and the first exhaust pipe 17 both pass through piston block 141, and their lower ends are connected to the inner cavity of cylinder 2. The upper end of intake pipe 16 is connected to an intake device through a hose.

[0028] Specifically, the first solenoid valve 163 and the second solenoid valve 165 can only be kept in an open and closed state during the test, thereby realizing the airtightness test of the upper and lower cylinder 2 of the piston block 141 respectively.

[0029] Specifically, the piston rod of the electric actuator 14 is provided with a scale, which allows the distance of each stroke to be determined during the stroke measurement process, and thus makes it easier to pinpoint the range of the leak point when a leak occurs.

[0030] Specifically, this device can only detect the approximate range of the leakage point on the cylinder block valve 2, and cannot accurately pinpoint the exact location of the leakage point. Compared with the existing technology that detects the overall valve sealing, this device greatly reduces the range of the leakage point.

[0031] In use, the upper end of the hydraulic rod is first fixed so that the first sealing ring on the lower side of the end plate corresponds one-to-one with the inner cavity of the cylinder. Then, the end plate is moved downward by the hydraulic rod until the first sealing ring is pressed against the upper end face of the cylinder. Then, the piston block is slid into the inner cavity of the cylinder by the electric push rod. When the piston block moves close to the bottom of the inner cavity, the movement is stopped. Then, the space under the piston block is inflated by the air inlet pipe and the second branch pipe. At this time, the internal air pressure is detected by the first air outlet pipe and the first pressure gauge. Then, the piston block is moved upward by the electric push rod a certain distance, and the inflation test is performed again until the piston block is close to the upper end of the inner cavity of the cylinder. At this time, the space between the piston block and the end plate is inflated by the air inlet pipe, the first branch pipe, the second air outlet pipe, and the second pressure gauge. This allows for multiple strokes of detection in the inner cavity of the cylinder, which facilitates the quick determination of the location and range of the leakage point.

[0032] The valve sealing performance testing device of this invention can effectively solve the problems mentioned in the background technology. Based on the existing valve sealing performance testing device technology, it can achieve segmented airtightness testing of valves, which makes it easy to pinpoint the range of leakage points, and can also test multiple valves at the same time.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve tightness detection device, comprising: The main body (1) of the detection device is characterized in that: the main body (1) of the detection device is connected to the cylinder (2), and the main body (1) of the detection device includes an end plate (11), and a hydraulic rod (15) is connected to the upper side of the end plate (11), and a fixing plate (13) is connected to the outer side of the hydraulic rod (15), and an electric push rod (14) is installed on the upper side of the fixing plate (13), and a piston block (141) is connected to the lower end of the electric push rod (14), and a second sealing ring (142) is provided on the outer wall of the piston block (141). A first branch pipe (162) and a second branch pipe (142) are slidably inserted into the end plate (11). The first branch pipe (162) and the first outlet pipe (17) are connected together. The bottom of the first branch pipe (162) is close to the upper end of the piston block (141). The second branch pipe (164) and the first outlet pipe (17) are inserted through the piston block (141). At the same time, the second outlet pipe (18) is inserted into the end plate (11). The upper ends of the first branch pipe (162) and the second branch pipe (164) are connected to the inlet pipe (16) through the tee (161). The upper ends of the first outlet pipe (17) and the second outlet pipe (18) are respectively connected to the first pressure gauge (171) and the second pressure gauge (181).

2. The valve tightness detection device according to claim 1, characterized in that The piston block (141) is slidably connected in the inner cavity of the cylinder (2), and the outer wall of the piston block (141) is provided with two sets of second sealing rings (142).

3. The valve tightness detection device according to claim 1, wherein Four sets of first sealing rings (12) are installed on the lower side of the end plate (11), and the first sealing rings (12) are respectively located on the outer periphery of the upper cavity of the inner cavity of the cylinder body (2).

4. The valve tightness detection device according to claim 1, wherein The first branch pipe (162) is equipped with a first solenoid valve (163), and the second branch pipe (164) is equipped with a second solenoid valve (165). A connecting block is connected between the first branch pipe (162) and the second branch pipe (164). The first solenoid valve (163), the second solenoid valve (165) and the connecting block are all located on the upper side of the end plate (11).

5. The valve tightness detection device according to claim 1, wherein The lower ends of the second branch pipe (164) and the first exhaust pipe (17) both pass through the piston block (141), and their lower ends are connected to the inner cavity of the cylinder (2).

6. The valve tightness detection device according to claim 1, wherein The upper end of the air intake pipe (16) is connected to an air intake device via a hose.

7. The valve sealing property detection device according to claim 1, wherein The fixing plate (13) is fixed on the piston rod of the hydraulic rod (15), and the hydraulic rod (15) is installed upside down.

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