Portable cylinder cover sealing performance detection device suitable for TBD234 series diesel engine

Abstract

The utility model provides a portable cylinder cover sealing performance detection device suitable for a TBD234 series diesel engine, which comprises a bottom plate, a backup plate, a positioning nut, a deflation valve and a high-pressure water filling nozzle, and is characterized in that the bottom plate and the backup plate are respectively used for fitting the bottom surface and the side surface of the cylinder cover of the diesel engine; the backup plate is fixedly connected with a deflation valve and a plurality of positioning nuts, and the positions of the positioning nuts are in one-to-one correspondence with the positions of screw holes of the cylinder cover; one end of the high-pressure water injection port is connected with a cylinder cover water inlet, and the other end is connected with the hand-cranking pressure test pump; the water outlets of the cylinder cover are located in the side attached to the backup plate, and one water outlet is communicated with the deflation valve.

Description

Technical Field

[0001] The invention relates to a sealing detection device. Background Art

[0002] TBD234 series diesel engine cylinder head (structure as Figure 4 The function of the cylinder head (as shown) is to seal the cylinder and form a combustion space together with the piston. Because it has to withstand the effects of high-temperature and high-pressure combustion gas, the cylinder head body needs to be cooled by circulating water cooling. The cooling water flow channel consists of 1 water inlet, 3 water outlets and an internal cavity.

[0003] At present, there is no relevant auxiliary equipment or device that can safely and efficiently complete the sealing test of the cooling water cavity inside the cylinder head of the TBD234 series diesel engine.

[0004] There is a solution for the sealing detection device of the cylinder head of a gasoline internal combustion engine in the prior art. Patent 201920623406.3 "A water-immersed jig for the cylinder head" uses a similar method to soaking in water before repairing a bicycle tire to seal each opening of the cylinder head and then immerse it in water to observe whether there are bubbles to determine the sealing. This solution has the following shortcomings:

[0005] 1) Before the cylinder head enters the water, the internal cavity pressure is atmospheric pressure. After entering the water, the external pressure is atmospheric pressure plus water pressure. Therefore, the external pressure of the cylinder head is greater than the internal cavity pressure, which easily causes the phenomenon that the gas inside the cylinder head does not bubble out (before repairing a bicycle tire, the inner tube is inflated first. After entering the water, the pressure inside the tire is greater than the pressure outside the tire, and bubbles will bubble out). The feasibility is poor;

[0006] 2) According to the patent description, an air pump is needed to pressurize the external water tank, which places high demands on the material of the water tank and the observability of the samples in the water tank from all angles. There is a certain risk of explosion after the air pump pressurizes the water tank, and the safety is not strong;

[0007] 3) This patent is for gasoline engine cylinder heads with spark plugs, not diesel engine cylinder heads.

[0008] There are also patents 201720817709.X "Engine cylinder sealing detection device", patent 202311503778.X "A cylinder air tightness detection device", patent 202310508917.1 "A cylinder air tightness detection device", patent 201820577306.7 "A cylinder air tightness detection device", etc., all of which are for detecting the sealing of the cylinder, rather than the sealing of the cooling water chamber inside the cylinder head. Summary of the invention

[0009] In order to overcome the deficiencies of the prior art, the present invention provides a TBD234 series diesel engine cylinder head sealing detection device, which can accurately determine the cylinder head leakage point during the maintenance process.

[0010] The technical solution adopted by the present invention to solve the technical problem is: a portable cylinder head sealing detection device suitable for TBD234 series diesel engines, comprising a bottom plate, a backing plate, a positioning nut, a venting valve and a high-pressure water injection port.

[0011] The bottom plate and the backing plate are used to fit the bottom and side surfaces of the diesel engine cylinder head respectively; the backing plate is fixedly connected to the bleed valve and a plurality of positioning nuts, and the positions of the positioning nuts correspond one to one with the positions of the screw holes of the cylinder head; one end of the high-pressure water injection port is connected to the water inlet of the cylinder head, and the other end is connected to the hand-cranked pressure test pump; the water outlet of the cylinder head is located on the side that fits the backing plate, and one of the water outlets is connected to the bleed valve.

[0012] The positioning nut and the cylinder head screw hole are connected by using original cylinder head bolts removed from the diesel engine.

[0013] A bushing is arranged between the positioning nut and the backing plate.

[0014] When the water outlet of the cylinder head is located in contact with the backing plate, an original sealing ring removed from a diesel engine is used in the sealing ring installation groove of the water outlet to ensure that the water outlet is blocked.

[0015] The hand-operated pressure test pump continuously pressurizes the cylinder head to 1.6 MPa and maintains the pressure.

[0016] The bottom plate and the back plate are made of carbon steel, aluminum alloy or bakelite.

[0017] The portable cylinder head sealing detection device suitable for TBD234 series diesel engines of the present invention comprises the following steps when used:

[0018] (1) When this device is used to detect the sealing performance, place the cylinder head on the bottom plate with the water inlet side facing upward and the water outlet side close to the plate;

[0019] (2) Install the original water outlet sealing ring into the three water outlet sealing ring installation grooves;

[0020] (3) Use four original cylinder head bolts to lock the cylinder head to the back plate;

[0021] (4) Install the high-pressure water injection port on the water inlet of the cylinder head and connect it to a hand-cranked pressure test pump;

[0022] (5) Open the vent valve and press the hand-cranked pressure test pump. When water flows out of the vent valve, the air in the cavity is exhausted and then close the vent valve;

[0023] (6) Continue to pressurize to 1.6 MPa and maintain the pressure, and observe whether there is any water seepage in the cylinder head. No water seepage indicates that the cylinder head is well sealed;

[0024] (7) After the test, open the vent valve to release the pressure, remove the cylinder head and pour out the water.

[0025] The beneficial effects of the present invention are:

[0026] (1) The present invention has a simple structure, is easy to use, and has strong feasibility. The sealing quality of the cylinder head can be judged by observing whether there is water leakage, which greatly improves certainty.

[0027] (2) Due to the large number of original diesel engine spare parts used, they are highly applicable and require less material to be carried.

[0028] (3) The present invention can be mass-produced using materials such as carbon steel, aluminum alloy, and bakelite at a relatively low cost.

[0029] (4) The present invention does not require additional power devices, has fewer parts, a low failure rate, and is applicable to a wide range of occasions.

[0030] (5) The present invention has the functions of venting air during high-pressure water injection and relieving pressure after the pressure test is completed. Expelling air improves detection accuracy, and pressure relief avoids water jets during disassembly to improve safety.

[0031] (6) The detection pressure used in the present invention is the normal pressure inside the cylinder head when the series of diesel engines are operating normally, and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 It is a left side view of the present invention.

[0034] Figure 3 It is a schematic diagram of the use of the present invention.

[0035] Figure 4 It is a schematic diagram of the detection object of the present invention.

[0036] Among them, 1-air bleed valve, 2-bushing, 3-positioning nut, 4-back plate, 5-bottom plate, 6-high-pressure water injection port, 7-original cylinder head bolt, 8-cylinder head to be tested, 9-side, 10-bottom. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0038] The invention provides a portable cylinder head sealing detection device suitable for TBD234 series diesel engines, comprising a bottom plate, a backing plate, a positioning nut, an air release valve and a high-pressure water injection port.

[0039] The bottom plate and the backing plate are perpendicular to each other and are used to fit the side and bottom of the diesel engine cylinder head respectively. The four positioning nuts and bushings are welded to the backing plate as a whole, and their positions correspond to the positions of the four screw holes of the cylinder head. The cylinder head can be locked and fitted on the backing plate by using the original cylinder head bolts removed from the diesel engine. Because the original screw is longer, a bushing is added between the positioning nut and the backing plate. It is not necessary to carry extra screws and nuts when repairing in advance, which reduces the burden on the repair personnel. The two ends of the high-pressure water injection port are used to connect the only water inlet on the top of the cylinder head and the hand-cranked pressure test pump respectively. The hand-cranked pressure test pump is a common tool and is usually equipped in repair units and ships. The three water outlets of the cylinder head are located on the side that fits the backing plate, including two at the bottom and one at the top. Each water outlet has a sealing ring installation groove originally. Using the original sealing ring removed from the diesel engine can ensure that the water outlet is blocked when the cylinder head is close to the backing plate. Since air leakage is difficult to identify with the naked eye, a bleed valve is installed at the high-position water outlet. The position of the bleed valve corresponds to the water outlet at a higher position of the cylinder head. It is used to exhaust the air inside the cavity during water injection and to relieve pressure after water injection. After the air is exhausted, the bleed valve is locked. The location where high-pressure water seeps is the leakage point of the cylinder head.

[0040] The portable cylinder head sealing detection device suitable for TBD234 series diesel engines of the present invention comprises the following steps when used:

[0041] (1) When this device is used to detect the sealing performance, place the cylinder head on the bottom plate with the water inlet side facing upward and the water outlet side close to the plate;

[0042] (2) Install the original water outlet sealing ring into the three water outlet sealing ring installation grooves;

[0043] (3) Use four original cylinder head bolts to lock the cylinder head to the back plate;

[0044] (4) Install the high-pressure water injection port on the water inlet of the cylinder head and connect it to a hand-cranked pressure test pump;

[0045] (5) Open the vent valve and press the hand-cranked pressure test pump. When water flows out of the vent valve, the air in the cavity is exhausted and then close the vent valve;

[0046] (6) Continue to pressurize to 1.6 MPa and maintain the pressure, and observe whether there is any water seepage in the cylinder head. No water seepage indicates that the cylinder head is well sealed;

[0047] (7) After the test, open the vent valve to release the pressure, remove the cylinder head and pour out the water.

[0048] like Figures 1 to 3 As shown, an embodiment of the present invention provides a portable cylinder head sealing detection device suitable for TBD234 series diesel engines, which can safely and efficiently detect cylinder head leakage points.

[0049] The invention provides a portable cylinder head sealing detection device suitable for TBD234 series diesel engines, which is composed of a bottom plate, a backing plate, a positioning nut, an air release valve and a high-pressure water injection port.

[0050] When this device is used to detect the sealing of the cylinder head, place the cylinder head on its side on the bottom plate, with the water inlet side facing upwards and the water outlet side close to the backing plate, install the original water outlet sealing ring into the 3 water outlet sealing ring installation grooves, use 4 original cylinder head bolts to lock the bottom of the cylinder head on the backing plate, install the high-pressure water injection port at the water inlet of the cylinder head and connect the hand-cranked pressure test pump, open the bleed valve and press the hand-cranked pressure test pump, and close the bleed valve after water flows out of the bleed valve, indicating that the air in the cavity is exhausted, and continue to pressurize to 1.6MPa and maintain the pressure, observe whether there are water seepage points in the cylinder head, and no water seepage means that the cylinder head is well sealed. After the test, open the bleed valve to release the pressure, remove the cylinder head and pour out the water.

[0051] The backing plate is used to seal the three water outlets on the bottom of the cylinder head. The backing plate should have a certain rigidity and the surface in contact with the cylinder head should be flat and smooth to ensure that no water leaks after the backing plate and the sealing ring are pressed tightly.

[0052] The position of the locating nut should correspond to the position of the screw hole on the cylinder head placed on the base plate, otherwise the screw cannot pass through the support plate.

[0053] There are two main reasons for cylinder head leakage: first, cracks in the cylinder head body lead to water leakage; second, the corresponding sealing surface between the injector water jacket and the cylinder head body fails, leading to water leakage. In particular, cooling water leakage from the cylinder head water jacket will cause cooling water to enter the diesel engine combustion chamber. Since water is incompressible, the piston will be blocked by the accumulated water and cannot operate. In severe cases, the diesel engine will be scrapped. Absolute sealing of the cylinder head is crucial for the safe operation of the diesel engine.

[0054] The portable cylinder head sealing detection device for TBD234 series diesel engines provided by the present invention is mainly used for the grade repair of the cylinder head of TBD234 series diesel engines, the leakage point judgment before emergency repair, and the sealing detection after repair. It has a simple principle, is easy to carry and use, can greatly improve the diesel engine repair efficiency and reduce the probability of rework.

Claims

1. A portable cylinder head sealing detection device suitable for TBD234 series diesel engines, comprising a base plate, a backing plate, a positioning nut, a venting valve and a high-pressure water injection port, characterized in that: The bottom plate and the backing plate are used to fit the bottom and side surfaces of the diesel engine cylinder head respectively; the backing plate is fixedly connected to the bleed valve and a plurality of positioning nuts, and the positions of the positioning nuts correspond one to one with the positions of the screw holes of the cylinder head; one end of the high-pressure water injection port is connected to the water inlet of the cylinder head, and the other end is connected to a hand-cranked pressure test pump; the water outlet of the cylinder head is located on the side that fits the backing plate, and one of the water outlets is connected to the bleed valve.

2. The portable cylinder head sealing detection device suitable for TBD234 series diesel engines according to claim 1 is characterized in that: The positioning nut and the cylinder head screw hole are connected by using original cylinder head bolts removed from the diesel engine.

3. The portable cylinder head sealing detection device suitable for TBD234 series diesel engines according to claim 1 is characterized in that: A bushing is arranged between the positioning nut and the backing plate.

4. The portable cylinder head sealing detection device suitable for TBD234 series diesel engines according to claim 1 is characterized in that: When the water outlet of the cylinder head is located in contact with the backing plate, an original sealing ring removed from a diesel engine is used in the sealing ring installation groove of the water outlet to ensure that the water outlet is blocked.

5. The portable cylinder head sealing detection device suitable for TBD234 series diesel engines according to claim 1 is characterized in that: The hand-operated pressure test pump continuously pressurizes the cylinder head to 1.6 MPa and maintains the pressure.

6. The portable cylinder head sealing detection device suitable for TBD234 series diesel engines according to claim 1 is characterized in that: The bottom plate and the back plate are made of carbon steel, aluminum alloy or bakelite.

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