A device and method for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump

Abstract

The present invention discloses a device for testing the sealing effectiveness of the high-pressure fuel chamber of a heavy-duty monobloc pump for marine electrical applications. The device comprises a pump sleeve, several O-rings, a plug, and a process inspection plunger. This device addresses the complex oil channel structure and numerous O-rings in the monobloc pump assembly. The device uses compressed air at varying pressures, combined with a testing device, to test the sealing effectiveness of the O-rings at various locations. The present invention also discloses a method for testing the sealing effectiveness of the high-pressure fuel chamber of a heavy-duty monobloc pump for marine electrical applications.

Description

Technical Field

[0001] The present invention relates to the technical field of single-unit pump sealing tests, and in particular to a device and method for detecting the sealing effect of a fuel high-pressure chamber of a ship electrical heavy-duty single-unit pump. Background Art

[0002] The large-power single-cylinder pump for marine electrical applications (single-cylinder power range is 100-500KW, and plunger diameter range is 18-32mm) has a plunger pair clearance of 0.008-0.012mm, compared to the 0.002-0.003mm plunger pair clearance of small-power single-unit pumps for vehicles and those burning light diesel. However, after adopting a large plunger pair clearance, an oil film cannot be effectively formed between the 0.008-0.012mm pair clearance. When conducting an air tightness test on the high-pressure fuel chamber of the assembled single-unit pump assembly, if specific testing methods and equipment are not adopted, the compressed air at a certain pressure used for the sealing test will directly leak out through the plunger pair clearance, resulting in a series of misjudgments and missed detections. Summary of the Invention

[0003] One of the purposes of the present invention is to solve the problem that when the existing ship electrical high-power single pump adopts the traditional method to conduct the air tightness test on the fuel high-pressure chamber, the relatively large gap between the plunger and the piston is present and the oil film cannot be formed, which easily causes the compressed air to leak out from the gap between the plunger and the piston, resulting in a decrease in the detected compressed air pressure. The compressed air after the pressure drop fails to detect the sealing effectiveness of the normally assembled sealing O-ring in the high-pressure fuel chamber of the single pump. At the same time, the phenomenon of compressed air pressure drop may cause misjudgment and other problems. A device for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump is provided to effectively avoid the above-mentioned defects.

[0004] A second object of the present invention is to provide a method for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump.

[0005] To achieve the above-mentioned purpose, the present invention provides a device for detecting the sealing effect of the fuel high-pressure chamber of a marine electrical heavy-duty single pump, comprising:

[0006] A pump sleeve, wherein a single pump assembly mounting hole and a roller body cavity are provided in the pump sleeve from top to bottom, and a high-pressure air cavity serving as a fuel high-pressure cavity is provided in the single pump mounting hole; a first high-pressure air hole connecting the high-pressure air cavity with the outside and serving as a fuel inlet, a second high-pressure air hole serving as a dirty oil outlet, and a lubricating oil inlet are provided on the pump sleeve; during testing, the single pump assembly is inserted into the single pump assembly mounting hole from bottom to bottom and press-fitted onto the pump sleeve via a gland and fasteners;

[0007] a first O-ring, a second O-ring, a third O-ring, and a fourth O-ring configured on the monomer pump assembly to seal a gap between an outer circumferential surface of the monomer pump assembly and a hole surface of the monomer pump assembly mounting hole, wherein the first O-ring is located above the first high-pressure air hole, and the second O-ring and the third O-ring are respectively arranged above and below the second high-pressure air hole, and are used to separate the fuel high-pressure chamber from the dirty oil outlet; the third O-ring and the fourth O-ring are respectively arranged above and below the lubricating oil inlet in the monomer pump assembly, and are used to separate the dirty oil outlet from the lubricating oil inlet, and to separate the lubricating oil inlet from the roller body cavity;

[0008] A screw plug is provided in the roller body cavity, and the screw plug axially limits the lower part of the single pump assembly;

[0009] a process detection plunger, the process detection plunger being inserted from bottom to top through the screw plug into the plunger hole in the single pump assembly;

[0010] A fifth O-type sealing ring, a sixth O-type sealing ring, and a seventh O-type sealing ring are arranged on the process detection plunger for use in different process detections.

[0011] In a preferred embodiment of the present invention, an eighth O-ring is provided on the screw plug to seal the gap between the outer periphery of the screw plug and the cavity surface of the roller body cavity.

[0012] A method for detecting the sealing effect of a fuel high-pressure chamber of a ship electrical heavy-duty single pump of the present invention comprises the following steps:

[0013] Step 1: After the single pump assembly is assembled on the pump sleeve, the plunger in the single pump assembly is removed and a process inspection plunger for inspection is installed. At the same time, the process inspection plunger is equipped with a fifth O-ring, a sixth O-ring, and a seventh O-ring for different inspection purposes;

[0014] Step 2: Introduce 0.5MPa compressed air into the first high-pressure air hole and maintain it for 30 seconds. If the pressure does not drop when checked by a flow meter, or if no bubbles appear at the dirty oil outlet and the joint surface of the single pump assembly and the pump sleeve when tested by the immersion method, it can be proved that the sealing of the first O-ring and the second O-ring is effective.

[0015] Step 3: Pass 0.5 MPa compressed air through the second high-pressure air hole and maintain it for 30 seconds. If the pressure does not drop or if no bubbles appear at the fuel inlet and roller cavity using the immersion test method on the single pump assembly, it can be confirmed that the sealing of the third and fourth O-rings is effective.

[0016] Step 4: Introduce 0.5 MPa compressed air through the lubricating oil inlet of the unit pump assembly and maintain it for 30 seconds. If the pressure does not drop or if no bubbles appear at the dirty oil outlet and roller cavity using the immersion method for the unit pump assembly, it can be confirmed that the third O-ring, the fourth O-ring, and the eighth O-ring on the screw plug are all effectively sealed;

[0017] In a preferred embodiment of the present invention, the immersion method is to place the single pump assembly and the pump sleeve as a whole into diesel fuel, and check whether bubbles appear at each sealing position.

[0018] Due to the adoption of the above technical solution, the present invention targets the complex oil channel structure and a large number of sealing O-rings of the single pump assembly, and adopts a detection device to detect the sealing effectiveness of the sealing O-rings at different positions by introducing compressed air of a certain pressure from different positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembly between the detection device for the sealing effect of the fuel high-pressure chamber of the ship electrical heavy-duty single pump of the present invention and the single pump assembly. DETAILED DESCRIPTION

[0020] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0021] See also Figure 1 The figure shows a device for detecting the sealing effect of the fuel high-pressure chamber of a heavy-duty single-unit pump for ship electrical equipment. The device comprises a pump sleeve 1, in which a single-unit pump assembly mounting hole 1a and a roller body cavity 1b are provided from top to bottom. A high-pressure air cavity 1c which also serves as the fuel high-pressure chamber is provided in the single-unit pump mounting hole 1a; a first high-pressure air hole 1d which connects the high-pressure air cavity 1c with the outside and also serves as a fuel inlet, a second high-pressure air port 1e which also serves as a dirty oil outlet, and a lubricating oil inlet 1f are provided on the pump sleeve 1; during detection, the single-unit pump assembly 2 is inserted into the single-unit pump assembly mounting hole 1a from bottom to bottom and is press-fitted onto the pump sleeve 1 through a pressure cover 12 and fasteners such as bolts 15.

[0022] A screw plug 11 is installed in the roller body cavity 1b, which axially limits the lower part of the single pump assembly 2; an eighth O-ring 14 is provided on the screw plug 11 to seal the gap between the outer periphery of the screw plug 11 and the cavity surface of the roller body cavity 1b.

[0023] A first O-ring 3, a second O-ring 4, a third O-ring 5 and a fourth O-ring 6 are arranged on the monomer pump assembly 2 to seal the gap between the outer peripheral surface of the monomer pump assembly 2 and the hole surface of the monomer pump assembly mounting hole 1a, wherein the first O-ring 3 is located at the upper part of the first high-pressure air hole, and the second O-ring 4 and the third O-ring 5 are respectively arranged above and below the second high-pressure air hole 1e, and are used to separate the fuel high-pressure chamber and the dirty oil outlet; the third O-ring 5 and the fourth O-ring 6 are respectively arranged above and below the lubricating oil inlet 1f in the monomer pump assembly 2, and are used to separate the dirty oil outlet and the lubricating oil inlet 1f and to separate the lubricating oil inlet 1f and the roller body cavity 1a.

[0024] The process detection plunger 7 is inserted from bottom to top through the screw plug 11 into the plunger hole 2b in the single pump assembly 2. The process detection plunger 7 is provided with a fifth O-ring 8, a sixth O-ring 9, and a seventh O-ring 10 for different process detections.

[0025] A method for detecting the sealing effect of a fuel high-pressure chamber of a ship electrical heavy-duty single pump of the present invention comprises the following steps:

[0026] Step 1: After the single pump assembly 2 is assembled on the pump sleeve 1, the plunger in the single pump assembly 2 is removed and a process detection plunger 7 for detection is installed. At the same time, the process detection plunger 7 is equipped with a fifth O-ring 8, a sixth O-ring 9, and a seventh O-ring 10 for different detection purposes;

[0027] Step 2: Introduce 0.5 MPa compressed air into the first high-pressure air hole 1d and maintain it for 30 seconds. If the pressure does not drop when checked by a flow meter, or if no bubbles appear at the second high-pressure air hole 1e of the single pump assembly 2 and the pump sleeve 1 and the joint surface 1g of the single pump assembly 2 and the pump sleeve 1 by immersion testing, it can be proved that the sealing of the first O-ring 3 and the second O-ring 4 is effective.

[0028] Step 3: Pass 0.5 MPa compressed air through the second high-pressure air hole 1e and maintain it for 30 seconds. If the pressure does not drop or if no bubbles are observed at the fuel inlet (i.e., the first high-pressure air hole 1d) and the roller body cavity 1b during immersion testing of the single pump assembly, it can be confirmed that the sealing of the third O-ring 5 and the fourth O-ring 6 is effective.

[0029] Step 4: Introduce 0.5 MPa compressed air from the lubricating oil inlet 2a of the unit pump assembly 2 and maintain it for 30 seconds. If the pressure does not drop or if no bubbles are seen at the dirty oil outlet, i.e., the second high-pressure air port 1e, and the roller body cavity using the immersion method for testing the unit pump assembly, it can be confirmed that the third O-ring 5, the fourth O-ring 6, and the eighth O-ring 14 on the screw plug 11 are all effectively sealed.

[0030] The above-mentioned immersion method is to place the single pump assembly 2 and the pump sleeve 1 as a whole into diesel fuel and check whether bubbles appear at each sealing position.

[0031] During the inspection, the oil injection hole 2a in the single pump assembly 2 is blocked with a plug.

Claims

1. A device for detecting the sealing effect of the fuel high-pressure chamber of a heavy-duty single pump of a ship, characterized in that: include: A pump sleeve, wherein a single pump assembly mounting hole and a roller body cavity are provided in the pump sleeve from top to bottom, and a high-pressure air cavity serving as a fuel high-pressure cavity is provided in the single pump mounting hole; a first high-pressure air hole connecting the high-pressure air cavity with the outside and serving as a fuel inlet, and a second high-pressure air hole serving as a waste oil outlet are provided on the pump sleeve; during testing, the single pump assembly is inserted into the single pump assembly mounting hole from bottom to bottom and press-fitted onto the pump sleeve via a gland and fasteners; a first O-ring, a second O-ring, a third O-ring, and a fourth O-ring configured on the monomer pump assembly to seal a gap between an outer circumferential surface of the monomer pump assembly and a hole surface of the monomer pump assembly mounting hole, wherein the first O-ring is located above the first high-pressure air hole, and the second O-ring and the third O-ring are respectively arranged above and below the second high-pressure air hole, and are used to separate the fuel high-pressure chamber from the dirty oil outlet; the third O-ring and the fourth O-ring are respectively arranged above and below the lubricating oil inlet in the monomer pump assembly, and are used to separate the dirty oil outlet from the lubricating oil inlet, and to separate the lubricating oil inlet from the roller body cavity; A screw plug is provided in the roller body cavity, and the screw plug axially limits the lower part of the single pump assembly; a process detection plunger, wherein before inserting the process detection plunger into the plunger hole in the monomer pump assembly, the plunger in the monomer pump assembly is first removed, and then the process detection plunger is inserted from bottom to top through the screw plug into the plunger hole in the monomer pump assembly; A fifth O-type sealing ring, a sixth O-type sealing ring, and a seventh O-type sealing ring are arranged on the process detection plunger for use in different process detections.

2. The device for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump according to claim 1 is characterized in that: An eighth O-type sealing ring is provided on the screw plug to seal the gap between the outer periphery of the screw plug and the cavity surface of the roller body cavity.

3. A method for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump based on the device for detecting the sealing effect of the fuel high-pressure chamber of a ship electrical heavy-duty single pump according to claim 1 or 2, comprising the following steps: Step 1: After the single pump assembly is assembled on the pump sleeve, the plunger in the single pump assembly is removed and a process inspection plunger for inspection is installed. At the same time, the process inspection plunger is equipped with a fifth O-ring, a sixth O-ring, and a seventh O-ring for different inspection purposes; Step 2: Introduce 0.5MPa compressed air into the first high-pressure air hole and maintain it for 30 seconds. If the pressure does not drop when checked by a flow meter, or if no bubbles appear at the dirty oil outlet and the joint surface of the single pump assembly and the pump sleeve when tested by the immersion method, it can be proved that the sealing of the first O-ring and the second O-ring is effective. Step 3: Pass 0.5 MPa compressed air through the second high-pressure air hole and maintain it for 30 seconds. If the pressure does not drop or if no bubbles appear at the fuel inlet and roller cavity using the immersion test method on the single pump assembly, it can be confirmed that the sealing of the third and fourth O-rings is effective. Step 4: Introduce 0.5MPa compressed air from the lubricating oil inlet of the single pump assembly and maintain it for 30 seconds. If the pressure does not drop or the single pump assembly is tested for bubbling at the dirty oil outlet and roller body cavity using the immersion method, it can be proved that the third O-ring, the fourth O-ring and the eighth O-ring on the screw plug are all effectively sealed.

4. The detection method according to claim 3, wherein The immersion method is to place the single pump assembly and the pump sleeve as a whole into diesel fuel and check whether bubbles appear at each sealing position.

Images