A bowl-shaped plug sealing leak detection mechanism integrating internal and external test functions

Abstract

In a bowl-shaped plug sealing leak test mechanism integrating internal test and external test functions, a fixed plate is connected with a moving plate through a sealing oil cylinder, a sealing head is arranged on the moving plate, and the sealing head comprises a bushing, a sealing head body, and a pressing rod, the bushing is insertedly matched with the sealing head body, a stop block is arranged on the sealing head body, a third sealing ring is arranged between the stop block and the bushing, a first sealing ring capable of sealingly cooperating with the end face of the opening end of the bowl-shaped plug in the oil pump mounting hole is arranged on the front end face of the sealing head body, a second sealing ring capable of sealingly cooperating with the lubricating oil hole of the bowl-shaped plug is arranged on the front end face of the pressing rod, a first test air channel is arranged in the pressing rod, the air outlet end of the first test air channel is arranged on the front end face of the pressing rod, a second test air channel is arranged in the sealing head body, and the air outlet end of the second test air channel is arranged on the front end outer wall of the sealing head body close to the first sealing ring. The design can not only consider internal test and external test, has high leak test efficiency, and can avoid deformation of the bowl-shaped plug under pressure.

Description

Technical Field

[0001] The present invention belongs to the technical field of sealing mechanisms, and specifically relates to a bowl-shaped plug sealing and leak testing mechanism with integrated internal and external testing functions. The invention is suitable for realizing internal and external testing on the same sealing and leak testing mechanism without switching the sealing and leak testing mechanism, thereby improving the leak testing efficiency. Background Art

[0002] Existing leak testing technology usually involves separately designing a leak test by pressurizing a bowl-shaped plug with a lubricating oil hole from the outside of the cylinder head cavity (referred to as external testing) and a leak test by pressurizing the entire low-pressure oil channel cavity by sealing the engine cylinder head oil pump mounting hole (referred to as internal testing). The internal test and the external test are respectively implemented through two sealing mechanisms. Different sealing mechanisms need to be switched during leak testing, resulting in low leak testing efficiency. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a bowl-shaped plug sealing leak testing mechanism with high leak testing efficiency and integrated internal and external testing functions.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A bowl-shaped plug sealing and leak testing mechanism with integrated internal and external test functions, the sealing and leak testing mechanism includes a fixed plate and a movable plate, the fixed plate is arranged parallel to the movable plate, a sealing oil cylinder is arranged on the fixed plate, the retractable end of the sealing oil cylinder is vertically connected to one side of the movable plate, and a sealing head is horizontally arranged on the other side of the movable plate, the sealing head includes a bushing, a sealing head body, and a pressure rod, the bushing is installed on the movable plate, the bushing is inserted into and matched with the rear end of the sealing head body, a stopper is fixed on the middle outer wall of the sealing head body, and the rear end face of the stopper is aligned with the front end of the bushing A third sealing ring is provided between the end faces, the front end of the plugging head body can be inserted into the oil pump mounting hole opened on the end face of the engine cylinder head, and a first sealing ring is provided on the front end face of the plugging head body, which can be sealed with the end face of the bowl-shaped plug opening inside the oil pump mounting hole. The pressure rod is located inside the cavity set inside the plugging head body, and the front end face of the pressure rod is provided with a second sealing ring which can be sealed with the lubricating oil hole opened in the middle part of the other end of the bowl-shaped plug. The rear end sleeve of the pressure rod is provided with a spring, and the two ends of the spring are respectively fixedly connected to the rear end outer wall of the pressure rod and the rear end inner wall of the cavity;

[0006] A first test air duct is provided inside the pressure rod, and the air inlet end of the first test air duct is opened on the front end face of the pressure rod, and the air outlet end of the first test air duct is connected to the first air pipe joint provided on the rear end face of the pressure rod. A second test air duct is provided inside the sealing head body, and the air inlet end of the second test air duct is opened on the front end outer wall of the sealing head body near the first sealing ring, and the air outlet end of the second test air duct is connected to the second air pipe joint provided on the rear end face of the sealing head body.

[0007] The fixed plate is further provided with a reaction force supporting cylinder for providing reaction force support to the movable plate, and the retractable end of the reaction force supporting cylinder is vertically connected to the middle of the movable plate.

[0008] A first guide rod and a first guide rod are respectively provided on both sides of the movable plate. The front ends of the first guide rod and the first guide rod are respectively fixedly connected to the two sides of the movable plate, and the rear ends of the first guide rod and the first guide rod are respectively inserted into and matched with two guide sleeves horizontally arranged on the fixed plate.

[0009] The retractable end of the blocking oil cylinder is detachably connected to the movable plate.

[0010] A fixed block is provided on the telescopic end of the blocking oil cylinder, and a mounting block is fixed to the rear end surface of the movable plate. A mounting groove is provided on the mounting block, and the inner wall of the mounting groove matches the outer wall of the fixed block.

[0011] The first sealing ring, the second sealing ring and the third sealing ring are all O-type sealing rings.

[0012] An extrusion block is provided between the third sealing ring and the bushing.

[0013] The sealing and leak testing mechanism further includes a base, and the bottom of the fixing plate is fixedly connected to the base.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The bowl-shaped plug sealing leak testing mechanism of the present invention integrates internal and external test functions, including a fixed plate and a movable plate. The fixed plate is arranged in parallel with the movable plate. A sealing oil cylinder is arranged on the fixed plate. The retractable end of the sealing oil cylinder is vertically connected to one side of the movable plate. A sealing head is horizontally arranged on the other side of the movable plate. The sealing head includes a bushing, a sealing head body, and a pressure rod. The bushing is installed on the movable plate. The bushing is inserted into and matched with the rear end of the sealing head body. A stopper is fixed on the middle outer wall of the sealing head body. A third sealing ring is arranged between the rear end face of the stopper and the front end face of the bushing. The front end of the sealing head body can be inserted into the oil pump mounting hole opened on the end face of the engine cylinder head. The front end of the sealing head body The surface is provided with a first sealing ring which can be sealed with the end face of the bowl-shaped plug opening inside the oil pump mounting hole, the pressure rod is located inside the cavity provided inside the sealing head body, and the front end face of the pressure rod is provided with a second sealing ring which can be sealed with the lubricating oil hole opened in the middle of the other end of the bowl-shaped plug, the rear end sleeve of the pressure rod is provided with a spring, the two ends of the spring are respectively fixedly connected to the rear end outer wall of the pressure rod and the rear end inner wall of the cavity, a first test air duct is provided inside the pressure rod, the air outlet end of the first test air duct is provided on the front end face of the pressure rod, the air inlet end of the first test air duct is connected to the first air pipe joint provided on the rear end face of the pressure rod, a second test air duct is provided inside the sealing head body, and the air outlet end of the second test air duct The sealing ring is provided on the outer wall of the front end of the sealing head body near the first sealing ring, and the air inlet end of the second test air channel is connected to the second air pipe joint provided on the rear end face of the sealing head body; the working principle of this design is to control the sealing oil cylinder to continuously extend, driving the sealing head to move forward into the oil pump mounting hole. During the movement, the first sealing ring first contacts with the end face of the bowl-shaped plug opening and deforms to form a seal, and the second sealing ring contacts with the lubricating oil hole, and then the pressure rod moves toward the rear end of the sealing head body and compresses the spring, and the elastic force generated by the compression of the spring is used to squeeze the second sealing ring. After being squeezed, the second sealing ring is deformed to block the lubricating oil hole to form a seal, and the sealing head body moves toward the rear end of the bushing. Move and squeeze the third sealing ring. The third sealing ring is deformed after being squeezed, and its outer wall contacts the inner wall of the oil pump mounting hole to form a seal. When an external test is required, inflate the first air pipe joint, and pressurize the bowl-shaped plug separately from the outside of the inner cavity of the low-pressure oil passage of the engine cylinder head to test for leaks. When an internal test is required, inflate the second air pipe joint, and test the inner cavity of the low-pressure oil passage of the engine cylinder head for leaks. On the one hand, this design can realize internal and external tests using the same sealing leak test mechanism without switching the sealing leak test mechanism, thereby improving the leak test efficiency. On the other hand, the compression displacement and compression elastic force of the spring are used to ensure good sealing between the second sealing ring and the lubricating oil hole while avoiding compression deformation of the bowl-shaped plug. Therefore, the present invention not only improves the leak test efficiency, but also can avoid compression deformation of the bowl-shaped plug.

[0016] 2. In the bowl-shaped plug leak testing mechanism of the present invention, which integrates internal and external testing functions, the retractable end of the plugging cylinder is detachably connected to the movable plate. This design allows the movable plate to be removed from the plugging leak testing mechanism when the sealing ring is fatigued and damaged, thereby replacing the entire plugging head, making maintenance very convenient. Therefore, the present invention is very convenient to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top view of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the middle plugging head.

[0019] Figure 3 The figure is a schematic diagram of the assembly of an engine cylinder head and a bowl-shaped plug in the prior art.

[0020] Figure 4 for Figure 4 Schematic diagram of the structure of the middle bowl-shaped plug.

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the installation block.

[0022] Figure 6 It is a structural schematic diagram of the present invention.

[0023] In the figure, the fixed plate 1, the guide sleeve 11, the movable plate 2, the first guide rod 21, the first guide rod 22, the mounting block 23, the mounting groove 231, the blocking cylinder 3, the fixed block 31, the blocking head 4, the bushing 41, the blocking head body 42, the block 421, the cavity 422, the second test air channel 423, the second air pipe joint 424, the pressure rod 43, the first test air channel 431, the first air pipe joint 432, the third sealing ring 44, the first sealing ring 45, the second sealing ring 46, the spring 47, the extrusion block 48, the reaction force support cylinder 5, the base 6, the engine cylinder head 7, the oil pump mounting hole 71, the bowl-shaped plug 72, and the lubricating oil hole 721. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0025] See also Figures 1 to 6, a bowl-shaped plug sealing and leak testing mechanism with integrated internal and external test functions, the sealing and leak testing mechanism includes a fixed plate 1 and a movable plate 2, the fixed plate 1 is arranged parallel to the movable plate 2, a sealing cylinder 3 is provided on the fixed plate 1, the retractable end of the sealing cylinder 3 is vertically connected to one side of the movable plate 2, and a sealing head 4 is horizontally provided on the other side of the movable plate 2, the sealing head 4 includes a bushing 41, a sealing head body 42, and a pressure rod 43, the bushing 41 is installed on the movable plate 2, the bushing 41 is inserted into and matched with the rear end of the sealing head body 42, a stopper 421 is fixed on the middle outer wall of the sealing head body 42, and the rear end face of the stopper 421 is in contact with the front end face of the bushing 41 A third sealing ring 44 is provided between the plugging head body 42, the front end of the plugging head body 42 can be inserted into the oil pump mounting hole 71 opened on the end surface of the engine cylinder head 7, and the front end surface of the plugging head body 42 is provided with a first sealing ring 45 that can be sealed with the end surface of the open end of the bowl-shaped plug 72 inside the oil pump mounting hole 71. The pressure rod 43 is located inside the cavity 422 set inside the plugging head body 42, and the front end surface of the pressure rod 43 is provided with a second sealing ring 46 that can be sealed with the lubricating oil hole 721 opened in the middle of the other end of the bowl-shaped plug 72. The rear end of the pressure rod 43 is provided with a spring 47, and the two ends of the spring 47 are respectively fixedly connected to the rear end outer wall of the pressure rod 43 and the rear end inner wall of the cavity 422;

[0026] A first test air channel 431 is provided inside the pressure rod 43, and the air outlet end of the first test air channel 431 is opened on the front end face of the pressure rod 43, and the air inlet end of the first test air channel 431 is connected to the first air pipe joint 432 provided on the rear end face of the pressure rod 43. A second test air channel 423 is provided inside the sealing head body 42, and the air outlet end of the second test air channel 423 is opened on the front end outer wall of the sealing head body 42 near the first sealing ring 45, and the air inlet end of the second test air channel 423 is connected to the second air pipe joint 424 provided on the rear end face of the sealing head body 42.

[0027] The fixed plate 1 is further provided with a reaction force support cylinder 5 for providing reaction force support to the movable plate 2 . The retractable end of the reaction force support cylinder 5 is vertically connected to the middle of the movable plate 2 .

[0028] A first guide rod 21 and a first guide rod 22 are respectively provided on both sides of the movable plate 2. The front ends of the first guide rod 21 and the first guide rod 22 are respectively fixedly connected to the two sides of the movable plate 2, and the rear ends of the first guide rod 21 and the first guide rod 22 are respectively inserted into and fitted with two guide sleeves 11 horizontally arranged on the fixed plate 1.

[0029] The retractable end of the blocking oil cylinder 3 is detachably connected to the movable plate 2 .

[0030] A fixed block 31 is provided on the telescopic end of the blocking cylinder 3, and a mounting block 23 is fixed to the rear end face of the movable plate 2. A mounting groove 231 is provided on the mounting block 23, and the inner wall of the mounting groove 231 cooperates with the outer wall of the fixed block 31.

[0031] The first sealing ring 45 , the second sealing ring 46 , and the third sealing ring 44 are all O-rings.

[0032] An extrusion block 48 is provided between the third sealing ring 44 and the bushing 41 .

[0033] The sealing and leak testing mechanism further includes a base 6 , and the bottom of the fixing plate 1 is fixedly connected to the base 6 .

[0034] The principle of the present invention is described as follows:

[0035] In the bowl-shaped plug sealing and leak testing mechanism with integrated internal and external testing functions of the present invention, the open end face of the bowl-shaped plug and the lubricating oil hole are sealed at the same time, and air is inflated at the first air pipe joint to realize leak testing by applying pressure from the outside of the bowl-shaped plug alone. The chamfer of the oil pump mounting hole is sealed by using a third sealing ring to expand outward under force, and air is inflated at the second air pipe joint to pressurize the entire cavity for leak testing. Therefore, both the external sealing of the bowl-shaped plug alone and the internal sealing of the cavity as a whole can be realized in the same leak testing mechanism.

[0036] Since the internal test is to expand the outer diameter of the third sealing ring by axially compressing it, so that it fits with the chamfered inner wall of the oil pump mounting hole to achieve the effect of sealing the cavity, it is very important to control the protrusion of the outer diameter of the third sealing ring. The amount of protrusion depends on factors such as the manufacturing material and thickness of the third sealing ring. Only when the material hardness is appropriate can good elasticity be obtained and an ideal compression amount be produced. Only when the thickness is moderate can a good fit be achieved without gaps. Usually, the protrusion is controlled to 0.5-1mm for the best sealing effect.

[0037] Example 1:

[0038] See also Figures 1 to 6, a bowl-shaped plug sealing leak testing mechanism with integrated internal and external test functions, including a base 6, a fixed plate 1, and a movable plate 2. The bottom of the fixed plate 1 is vertically connected to the base 6, the fixed plate 1 and the movable plate 2 are arranged in parallel, and a sealing cylinder 3 is provided on the fixed plate 1. The retractable end of the sealing cylinder 3 is detachably connected to one side of the movable plate 2, and a sealing head 4 is horizontally provided on the other side of the movable plate 2. The sealing head 4 includes a bushing 41, a sealing head body 42, and a pressure rod 43. The bushing 41 is installed on the movable plate 2, and the bushing 41 is inserted into and matched with the rear end of the sealing head body 42. A stopper 421 is fixed on the middle outer wall of the sealing head body 42, and a third sealing ring 44 is provided between the rear end face of the stopper 421 and the front end face of the bushing 41. An extrusion block 48 is provided between the sleeves 41, and the front end of the plugging head body 42 can be inserted into the oil pump mounting hole 71 opened on the end face of the engine cylinder head 7, and a first sealing ring 45 is provided on the front end face of the plugging head body 42, which can be sealed with the end face of the open end of the bowl-shaped plug 72 inside the oil pump mounting hole 71. The pressure rod 43 is located inside the cavity 422 provided inside the plugging head body 42, and a second sealing ring 46 is provided on the front end face of the pressure rod 43, which can be sealed with the lubricating oil hole 721 opened in the middle part of the other end of the bowl-shaped plug 72. The second sealing ring 46, the first sealing ring 45, and the third sealing ring 44 are all O-rings. The rear end sleeve of the pressure rod 43 is provided with a spring 47, and the two ends of the spring 47 are respectively fixedly connected to the rear end outer wall of the pressure rod 43 and the rear end inner wall of the cavity 422;

[0039] A first test air channel 431 is provided inside the pressure rod 43, and the air outlet end of the first test air channel 431 is opened on the front end face of the pressure rod 43, and the air inlet end of the first test air channel 431 is connected to the first air pipe joint 432 provided on the rear end face of the pressure rod 43. A second test air channel 423 is provided inside the sealing head body 42, and the air outlet end of the second test air channel 423 is opened on the front end outer wall of the sealing head body 42 near the first sealing ring 45, and the air inlet end of the second test air channel 423 is connected to the second air pipe joint 424 provided on the rear end face of the sealing head body 42.

[0040] Example 2:

[0041] The difference from Example 1 is that:

[0042] The fixed plate 1 is further provided with a reaction force support cylinder 5 for providing reaction force support to the movable plate 2 . The retractable end of the reaction force support cylinder 5 is vertically connected to the middle of the movable plate 2 .

[0043] Example 3:

[0044] The difference from Example 1 is that:

[0045] A first guide rod 21 and a first guide rod 22 are respectively provided on both sides of the movable plate 2. The front ends of the first guide rod 21 and the first guide rod 22 are respectively fixedly connected to the two sides of the movable plate 2, and the rear ends of the first guide rod 21 and the first guide rod 22 are respectively inserted into and fitted with two guide sleeves 11 horizontally arranged on the fixed plate 1.

[0046] Example 4:

[0047] The difference from Example 1 is that:

[0048] A fixed block 31 is provided on the telescopic end of the blocking cylinder 3, and a mounting block 23 is fixed to the rear end face of the movable plate 2. A mounting groove 231 is provided on the mounting block 23, and the inner wall of the mounting groove 231 cooperates with the outer wall of the fixed block 31.

Claims

1. A bowl-shaped plug leak testing mechanism integrating internal and external testing functions, characterized by: The plugging and leak testing mechanism comprises a fixed plate (1) and a movable plate (2). The fixed plate (1) and the movable plate (2) are arranged in parallel. A plugging cylinder (3) is arranged on the fixed plate (1). The retractable end of the plugging cylinder (3) is vertically connected to one side of the movable plate (2). A plugging head (4) is horizontally arranged on the other side of the movable plate (2). The plugging head (4) comprises a bushing (41), a plugging head body (42), and a pressure rod (43). The bushing (41) is mounted on the movable plate (2). The bushing (41) is inserted into and matched with the rear end of the plugging head body (42). A stopper (421) is fixed on the middle outer wall of the plugging head body (42). A third sealing ring ( 44), the front end of the plugging head body (42) can be inserted into the oil pump mounting hole (71) opened on the end face of the engine cylinder head (7), and a first sealing ring (45) is provided on the front end face of the plugging head body (42) to be sealed with the end face of the bowl-shaped plug (72) inside the oil pump mounting hole (71), and the pressure rod (43) is located inside the cavity (422) set inside the plugging head body (42), and the front end face of the pressure rod (43) is provided with a second sealing ring (46) to be sealed with the lubricating oil hole (721) opened in the middle of the other end of the bowl-shaped plug (72), and the rear end of the pressure rod (43) is provided with a spring (47), and the two ends of the spring (47) are fixedly connected to the rear end outer wall of the pressure rod (43) and the rear end inner wall of the cavity (422) respectively; A first test air channel (431) is provided inside the pressure rod (43), an air outlet end of the first test air channel (431) is provided on the front end face of the pressure rod (43), an air inlet end of the first test air channel (431) is connected to a first air pipe joint (432) provided on the rear end face of the pressure rod (43), a second test air channel (423) is provided inside the plugging head body (42), an air outlet end of the second test air channel (423) is provided on a portion of the front end outer wall of the plugging head body (42) close to the first sealing ring (45), and an air inlet end of the second test air channel (423) is connected to a second air pipe joint (424) provided on the rear end face of the plugging head body (42).

2. The bowl-shaped plug leak testing mechanism integrating internal and external testing functions according to claim 1, characterized in that: The fixed plate (1) is also provided with a reaction force support cylinder (5) for providing reaction force support to the movable plate (2), and the retractable end of the reaction force support cylinder (5) is vertically connected to the middle of the movable plate (2).

3. A bowl-shaped plug sealing and leak testing mechanism integrating internal and external testing functions according to claim 1 or 2, characterized in that: A first guide rod (21) and a second guide rod (22) are respectively provided on both sides of the movable plate (2); the front ends of the first guide rod (21) and the second guide rod (22) are respectively fixedly connected to the two sides of the movable plate (2); and the rear ends of the first guide rod (21) and the second guide rod (22) are respectively inserted into and fitted with two guide sleeves (11) horizontally provided on the fixed plate (1).

4. A bowl-shaped plug sealing and leak testing mechanism integrating internal and external testing functions according to claim 1 or 2, characterized in that: The retractable end of the blocking oil cylinder (3) is detachably connected to the movable plate (2).

5. The bowl-shaped plug leak testing mechanism integrating internal and external testing functions according to claim 4, characterized in that: A fixed block (31) is provided on the telescopic end of the blocking oil cylinder (3), and a mounting block (23) is fixed to the rear end surface of the movable plate (2). A mounting groove (231) is provided on the mounting block (23), and the inner wall of the mounting groove (231) matches the outer wall of the fixed block (31).

6. A bowl-shaped plug sealing and leak testing mechanism integrating internal and external testing functions according to claim 1 or 2, characterized in that: The first sealing ring (45), the second sealing ring (46), and the third sealing ring (44) are all O-rings.

7. A bowl-shaped plug sealing and leak testing mechanism integrating internal and external testing functions according to claim 1 or 2, characterized in that: An extrusion block (48) is provided between the third sealing ring (44) and the bushing (41).

8. A bowl-shaped plug sealing and leak testing mechanism integrating internal and external testing functions according to claim 1 or 2, characterized in that: The sealing and leak testing mechanism further comprises a base (6), and the bottom of the fixing plate (1) is fixedly connected to the base (6).

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