CN114112247A - Sealing device for diesel engine front end box body hydrostatic test and use method - Google Patents
Sealing device for diesel engine front end box body hydrostatic test and use method Download PDFInfo
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- CN114112247A CN114112247A CN202111383145.0A CN202111383145A CN114112247A CN 114112247 A CN114112247 A CN 114112247A CN 202111383145 A CN202111383145 A CN 202111383145A CN 114112247 A CN114112247 A CN 114112247A
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- frustum
- tensioning
- shaped
- sealing device
- diesel engine
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3209—Details, e.g. container closure devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/11—Plugs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sealing device for a hydraulic test of a front-end box body of a diesel engine and a using method of the sealing device. The frustum-shaped tensioning nuts are respectively screwed at one corresponding end of the double-head adjusting screw rod and are positioned in frustum holes at two ends of the tensioning sleeve, and the tensioning sleeve, the pair of frustum-shaped tensioning nuts and one end of the double-head adjusting screw rod are plugged into a special-shaped cavity of a front-end box body of the diesel engine. The using method comprises the steps of 1) assembling the sealing device and arranging the sealing device into two ends of the tensioning sleeve, 2) arranging the sealing device into a special-shaped cavity of the front-end box body, and 3) rotating the double-head adjusting screw rod to enable the sealing device to seal the special-shaped cavity. The rubber pad outside the tensioning sleeve is extruded to generate elastic deformation, so that the sealing performance of the special-shaped cavity is improved, and the problem of sealing the curved surface of the special-shaped cavity is solved.
Description
Technical Field
The invention relates to a hydraulic test of a pore passage of an inner cavity of a box body, in particular to a sealing device and a test method for the hydraulic test of the pore passage of a cavity of the box body of a diesel engine, belonging to the technical field of a pressure-resistant test of the box body.
Background
The front end box body is an important part of a marine medium-speed diesel engine (the rotating speed is less than or equal to 4000 r/min), is arranged on the front side of a diesel engine frame, and the bottom of the front end box body is fixed on a common base of the diesel engine. The fuel oil, lubricating oil, circulating cooling water and other channel cavities of the marine medium-speed diesel engine are integrated in the front-end box body, and a communicating cavity between the channel cavities is further arranged. The front-end box body is an iron casting, the quality of the front-end box body directly influences the overall performance and the service life of the diesel engine, in order to ensure the normal operation of the diesel engine, all the channel cavities in the front-end box body must be capable of respectively conveying fuel oil, lubricating oil and circulating cooling water, the channel cavities for conveying different fluid media cannot be communicated, and otherwise the normal operation of the diesel engine is seriously influenced and even safety accidents occur. In order to ensure the sealing performance of each channel cavity in the front-end box body, each channel cavity of the front-end box body needs to be subjected to a hydrostatic test respectively to test the sealing performance of the channel cavity. And each inlet and outlet of each channel cavity of the hydrostatic test is sealed by a sealing device, one sealing device is provided with a water inlet, water is added to pressurize to a set value, and then pressure is maintained for a period of time, and at the moment, if the water pressure of the tested channel cavity does not obviously drop, the channel cavity passes the hydrostatic test.
The front end box body is also internally provided with a special-shaped cavity communicated with the three channel cavities, the curved surface of the special-shaped cavity is difficult to seal, and a special sealing device needs to be developed to solve the problem.
Disclosure of Invention
The invention aims to provide a sealing device for a diesel engine front end box body hydraulic test, which has a simple structure and can effectively seal a special-shaped cavity in a front end box body, and a using method thereof.
The invention is realized by the following technical scheme:
a sealing device for a hydrostatic test of a front-end box body of a diesel engine comprises 2 semi-cylindrical tensioning sleeves, a pair of frustum-shaped tensioning nuts and 1 double-head adjusting screw rod, wherein rubber pads are respectively bonded on the semi-cylindrical peripheral surfaces of the tensioning sleeves, the 2 semi-cylindrical tensioning sleeves are combined into a cylinder with a gap left in the middle, frustum holes are respectively formed in two ends of the cylinder, the small ends of the frustum holes are communicated, and the peripheral surface of each frustum hole is matched with the frustum-shaped peripheral surface of the frustum-shaped tensioning nut; the thread turning directions of the two ends of the double-head adjusting screw rod are opposite, and the internal threads of the pair of frustum-shaped tensioning nuts are also opposite; frustum-shaped tensioning nuts are respectively screwed at one corresponding end of the double-head adjusting screw, frustum-shaped peripheral surfaces of the frustum-shaped tensioning nuts are respectively embedded into frustum holes at two ends of a synthesized cylinder by the 2 semi-cylindrical tensioning sleeves, and the 2 semi-cylindrical tensioning sleeves, the pair of frustum-shaped tensioning nuts and one end of the double-head adjusting screw are plugged into a special-shaped cavity of a front-end box body of the diesel engine.
The object of the invention can be further achieved by the following technical measures:
further, the ratio of the length L1 of the frustum-shaped tensioning nut to the length L of the frustum hole of the tensioning sleeve is as follows: L1/L =0.60 ~ 0.64. The taper of the frustum-shaped tensioning nut and the taper of the frustum hole of the tensioning sleeve are both 1: 4.
Furthermore, the thickness of the rubber pad is 2.5-3.5 mm.
Furthermore, the other end of the double-end adjusting screw extends out of the light rod section, the diameter of the light rod section is smaller than that of one end of the double-end adjusting screw, and the end of the light rod section is a cuboid.
Further, a gap B between adjacent surfaces of the 2 semi-cylindrical tensioning sleeves is = 3-5 mm.
A use method of a sealing device for a hydraulic test of a front-end tank body of a diesel engine comprises the following steps:
1) screwing a pair of frustum-shaped tensioning nuts with opposite thread turning directions on two corresponding ends of the double-head adjusting screw respectively until the distance B between the small end face of the frustum-shaped tensioning nut and the root of the corresponding thread is B = 4-5 mm;
2) respectively abutting the frustum hole diameter of the 2 semi-cylindrical tensioning sleeves bonded with the rubber pads against the peripheral surface of the frustum-shaped tensioning nut, so that the frustum-shaped tensioning nuts are respectively embedded in frustum holes corresponding to two ends of the tensioning sleeves;
3) sleeving a wrench on a square body at the end head of the other end of the double-end adjusting screw rod, rotating the wrench clockwise to drive the double-end adjusting screw rod to rotate clockwise, so as to drive a pair of frustum-shaped tensioning nuts to move close to each other relatively, increasing the outer diameter of each tensioning sleeve until the outer diameter of a rubber pad of each tensioning sleeve is 0.3-0.5 mm smaller than the inner diameter of a special-shaped cavity to be sealed, and then plugging one end of each of the tensioning sleeves, the pair of frustum-shaped tensioning nuts and the double-end adjusting screw rod into the special-shaped cavity of a front-end box body of the diesel engine; continuing to rotate the wrench clockwise until the wrench is not rotated, and enabling the two frustum-shaped tensioning nuts to approach each other, so that the outer diameter of the tensioning sleeve is increased; the rubber pad on the outer side of the tensioning sleeve is extruded by the hole wall of the special-shaped cavity to generate elastic deformation, so that the sealing of the special-shaped cavity is completed;
4) after the hydrostatic test is finished, the wrench is screwed anticlockwise to enable the two frustum-shaped tensioning nuts to be away from each other, so that the outer diameter of the tensioning sleeve is reduced, the rubber pad is separated from the hole wall of the special-shaped cavity, and the tensioning sleeve, the pair of frustum-shaped tensioning nuts and the double-end adjusting screw rod can be taken out.
The special-shaped cavity sealing structure is simple in structure and convenient to use, frustum-shaped tensioning nuts are respectively screwed on two ends of the double-end screw rod and respectively plugged into frustum holes in two ends of the tensioning sleeve, the double-end screw rod is rotated clockwise, the frustum-shaped tensioning nuts respectively move relatively towards the length center direction of the tensioning sleeve, so that the 2 semi-cylindrical tensioning sleeves are pushed to move outwards in the radial direction, the rubber pads outside the tensioning sleeves in the special-shaped cavity are extruded to generate elastic deformation, and the sealing performance of the special-shaped cavity is improved.
Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a right side view of fig. 1.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 and 2, the present embodiment includes 2 semi-cylindrical tensioning sleeves 1, a pair of frustum- shaped tensioning nuts 2, and 1 double-end adjusting screw 3, wherein rubber pads 4 are respectively bonded on the semi-cylindrical outer circumferential surfaces of the tensioning sleeves 1, the 2 semi-cylindrical tensioning sleeves 1 are combined into a cylinder with a gap a =4mm left in the middle, frustum holes 11 with communicating small ends are respectively arranged at two ends of the cylinder, and the circumferential surface of each frustum hole 11 is matched with the frustum-shaped outer circumferential surface of the frustum-shaped tensioning nut 2. The thread turning directions of the two ends of the double-head adjusting screw rod 3 are opposite, and the internal threads of the pair of frustum-shaped tensioning nuts 2 are also opposite. The frustum-shaped tensioning nuts 2 are respectively screwed at one corresponding end of the double-end adjusting screw 3, the frustum-shaped peripheral surfaces of the frustum-shaped tensioning nuts 2 are respectively embedded into frustum holes 11 at two ends of the combined cylinder of the 2 semi-cylindrical tensioning sleeves 1, and the combined 2 semi-cylindrical tensioning sleeves 1, the pair of frustum-shaped tensioning nuts 2 and the left end of the double-end adjusting screw 3 are plugged into a special-shaped cavity 10 of a front-end box body of the diesel engine.
The ratio of the length L1 of the frustum-shaped tensioning nut to the length L of the frustum hole of the tensioning sleeve is as follows: L1/L = 0.60-0.64, so that the frustum-shaped tensioning nut 2 has enough moving length in the frustum hole 11 of the tensioning sleeve 1, the variation of the outer diameter of the tensioning sleeve 1 is enlarged, and the application range of the tensioning sleeve is widened. The taper of the frustum-shaped tensioning nut 2 and the taper of the frustum hole 11 of the tensioning sleeve 1 in the embodiment are both 1: 4. The thickness of the rubber pad 4 is 3.0 mm. The right end of the double-end adjusting screw rod 3 extends out of the polish rod section 31, the diameter of the polish rod section 31 is smaller than that of the double-end adjusting screw rod 3, and the end of the polish rod section 31 is a square 311 which is convenient for wrenching by a wrench.
A use method of a sealing device for a hydraulic test of a front-end tank body of a diesel engine comprises the following steps:
1) and respectively screwing a pair of frustum-shaped tensioning nuts 2 with opposite thread turning directions on two corresponding ends of the double-head adjusting screw rod 3 until the distance B between the small end surface of the frustum-shaped tensioning nut 2 and the root part of the corresponding thread is B =5mm, and remaining the movement adjusting amount of the frustum-shaped tensioning nut 2.
2) The frustum holes 11 of the 2 semi-cylindrical tensioning sleeves 1 which are bonded with the rubber pads 4 are radially abutted against the peripheral surfaces of the frustum-shaped tensioning nuts 2 respectively, so that the frustum-shaped tensioning nuts 2 are embedded in the frustum holes 11 corresponding to the two ends of the tensioning sleeves 1 respectively.
3) The wrench is sleeved on the square body 311 at the right end of the double-end adjusting screw rod 3, the wrench is rotated clockwise to drive the double-end adjusting screw rod 3 to rotate clockwise, so that the pair of frustum-shaped tensioning nuts 2 is driven to move close to each other, the outer diameter of the tensioning sleeve 1 is increased until the outer diameter of the rubber pad 4 of the tensioning sleeve 1 is 0.3-0.5 mm smaller than the inner diameter of the special-shaped cavity 10 to be sealed, and then the tensioning sleeve 1, the pair of frustum-shaped tensioning nuts 2 and the left end of the double-end adjusting screw rod 3 are plugged into the special-shaped cavity 10 of the front end box body of the diesel engine. And continuing to rotate the wrench clockwise until the wrench is not rotated, so that the two frustum-shaped tensioning nuts 2 are close to each other, and the outer diameter of the tensioning sleeve 1 is increased. The rubber pad 4 outside the tensioning sleeve 1 is extruded by the hole wall of the special-shaped cavity 10 to generate elastic deformation, so that the sealing of the special-shaped cavity 10 is completed.
4) After the hydrostatic test is finished, the wrench is screwed anticlockwise to enable the two frustum-shaped tensioning nuts 2 to be far away from each other, so that the outer diameter of the tensioning sleeve 1 is reduced, the rubber pad 4 is separated from the hole wall of the special-shaped cavity 10, and the tensioning sleeve 1, the pair of frustum-shaped tensioning nuts 2 and the double-end adjusting screw rod 3 can be taken out.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a diesel engine front end box hydrostatic test's sealing device which characterized in that: the device comprises 2 semi-cylindrical tensioning sleeves, a pair of frustum-shaped tensioning nuts and 1 double-head adjusting screw rod, wherein rubber pads are respectively bonded on the semi-cylindrical peripheral surfaces of the tensioning sleeves, the 2 semi-cylindrical tensioning sleeves are combined into a cylinder with a gap left in the middle, frustum holes are respectively arranged at two ends of the cylinder, the small ends of the frustum holes are communicated, and the peripheral surface of each frustum hole is matched with the frustum-shaped peripheral surface of each frustum-shaped tensioning nut; the thread turning directions of the two ends of the double-head adjusting screw rod are opposite, and the internal threads of the pair of frustum-shaped tensioning nuts are also opposite; frustum-shaped tensioning nuts are respectively screwed at one corresponding end of the double-head adjusting screw, frustum-shaped peripheral surfaces of the frustum-shaped tensioning nuts are respectively embedded into frustum holes at two ends of a synthesized cylinder by the 2 semi-cylindrical tensioning sleeves, and the 2 semi-cylindrical tensioning sleeves, the pair of frustum-shaped tensioning nuts and one end of the double-head adjusting screw are plugged into a special-shaped cavity of a front-end box body of the diesel engine.
2. The diesel engine front end tank body hydraulic test sealing device according to claim 1, characterized in that: the ratio of the length L1 of the frustum-shaped tensioning nut to the length L of the frustum hole of the tensioning sleeve is as follows: L1/L =0.60 ~ 0.64.
3. The diesel engine front end tank body hydraulic test sealing device according to claim 1, characterized in that: the taper of the frustum-shaped tensioning nut and the taper of the frustum hole of the tensioning sleeve are both 1: 4.
4. The diesel engine front end tank body hydraulic test sealing device according to claim 1, characterized in that: the thickness of the rubber pad is 2.5-3.5 mm.
5. The diesel engine front end tank body hydraulic test sealing device according to claim 1, characterized in that: the other end of the double-end adjusting screw rod extends out of the light rod section, the diameter of the light rod section is smaller than that of the double-end adjusting screw rod, and the end of the light rod section is a square body.
6. The diesel engine front end tank body hydraulic test sealing device according to claim 1, characterized in that: a clearance A =3 ~ 5mm between the adjacent face of the 2 semicylindrical tensioning sleeves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111383145.0A CN114112247A (en) | 2021-11-22 | 2021-11-22 | Sealing device for diesel engine front end box body hydrostatic test and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111383145.0A CN114112247A (en) | 2021-11-22 | 2021-11-22 | Sealing device for diesel engine front end box body hydrostatic test and use method |
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| Publication Number | Publication Date |
|---|---|
| CN114112247A true CN114112247A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111383145.0A Pending CN114112247A (en) | 2021-11-22 | 2021-11-22 | Sealing device for diesel engine front end box body hydrostatic test and use method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126954A (en) * | 2022-06-28 | 2022-09-30 | 福建省闽旋科技股份有限公司 | Novel rotary sealing device for fixing inner pipe |
-
2021
- 2021-11-22 CN CN202111383145.0A patent/CN114112247A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126954A (en) * | 2022-06-28 | 2022-09-30 | 福建省闽旋科技股份有限公司 | Novel rotary sealing device for fixing inner pipe |
| CN115126954B (en) * | 2022-06-28 | 2024-02-02 | 福建省闽旋科技股份有限公司 | Rotary sealing device for fixing inner pipe |
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