Oil groove wire outlet device and installation method

Abstract

The invention provides an oil groove wire outlet device and an installation method, and relates to the field of power generation equipment oil groove wire outlet devices.The oil groove wire outlet device comprises an oil groove wall, a device shell, a sealing body, a limiting connector and a lead, the device shell is fixed to the oil groove wall, and wire penetrating holes for the lead to penetrate are formed in the oil groove wall and the device shell; a wire outlet hole is formed in the end, away from the oil groove wall, of the device shell, the wire outlet hole is a threaded hole, the limiting connector is connected to the device shell through threads, a plurality of oleophobic spheres with the same set compression amount serve as sealing bodies to be filled in the device shell, and the pressure borne by the sealing bodies deforms within a set range and does not lose efficacy. After a unit runs for a period of time for a long time and individual sealing bodies fail, the compression amount of the other sealing bodies naturally changes accordingly, the influence of a failing cavity on sealing is automatically made up, the sealing effect of the whole oil groove wire outlet device is improved, and the service life of the whole oil groove wire outlet device is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of oil tank outlet devices for power generation equipment, and particularly to an oil tank outlet device and an installation method that achieve sealing by using multiple seals. Background Art

[0002] In a hydro-generator set, thrust bearings and guide bearings are core components that affect the long-term safe and stable operation of the unit. The lubrication and heat dissipation of thrust bearings and guide bearings are achieved by turbine oil in the oil tank. Cables of detection devices such as temperature sensors for detecting the bearing pad temperature need to be led out from the oil tank. Therefore, in general, the unit needs to arrange an outlet device on the oil tank wall.

[0003] For the existing oil tank outlet devices of hydro-generator sets, sealing is mainly achieved by forms such as sealing rings, gaskets, and aviation plugs. Affected by the service life of the seals and the sealing structure, problems such as oil leakage are likely to occur, affecting the long-term stable operation of the unit. Technical solutions using combinations of multiple seals and special-shaped seals, such as the utility model patent with the publication number CN205858552U, publication date January 4, 2017, and name "A Hydro-generator Oil Tank Wiring Junction Panel", which includes a junction panel seat, and wire-passing connectors are evenly arranged on the junction panel seat. The lead wire is led out from the oil tank through the junction panel seat and the wire-passing connectors. The wire-passing connector includes a wire-passing base, and an umbrella-shaped sealing ring is installed inside the wire-passing base. The umbrella-shaped sealing ring is sleeved outside the lead wire and is locked and fixed by a first lock. A second lock is installed inside the first lock. The lower end surface of the second lock contacts the first lock. The second lock is locked and fixed in the cavity at its bottom by a second lock. A first lock is installed at the center of the second lock. The first lock is sleeved outside the umbrella-shaped sealing ring, and a third lock is pressed on the top of the first lock. By adding an umbrella-shaped sealing ring and optimizing the junction panel structure, the existing deficiencies are solved.

[0004] The utility model patent with the publication number CN218275255U, publication date January 10, 2023, and name "High-oil-pressure Temperature Signal Lead-out Wiring Junction Panel Device inside a Hydro-generator", includes: an installation flange; a wiring junction panel, the wiring junction panel is connected to one side of the installation flange, and a stepped hole is provided on the wiring junction panel; a compression bolt, the compression bolt is matched with the stepped hole; a sealing gasket, the sealing gasket is arranged in the stepped hole, the sealing gasket is in interference fit with the stepped hole, one end of the sealing gasket abuts against the end of the compression bolt extending into the stepped hole, and the other end of the sealing gasket abuts against the stepped end surface of the stepped hole; a signal cable, the signal cable passes through the sealing gasket and the compression bolt. By setting the compression bolt and the sealing gasket, by simply tightening the compression bolt, the sealing gasket is pressed against the inner wall of the stepped hole, and the sealing gasket is closely attached to the inner wall of the stepped hole and the signal cable, so as to achieve a good sealing effect.

[0005] The above-mentioned existing technology has a better sealing effect compared with the traditional sealing solution, but it still cannot avoid the influence of the lifespan of the seal itself on the sealing effect, and has disadvantages such as a relatively complex structure and high requirements for on-site installation. Summary of the Invention

[0006] To solve the deficiencies of the above-mentioned existing technology, the present invention proposes an oil tank wire outlet device and an installation method. By using multiple sealing bodies with a set compression amount initially, a sealing chamber of the oil tank wire outlet device is jointly formed to achieve the sealing effect. After the unit has been running for a long time, when an individual sealing body fails, the compression amounts of the remaining sealing bodies change accordingly, automatically compensating for the influence of the failed sealing body on the seal, improving the sealing effect and service life of the entire oil tank wire outlet device, and the structure of this oil tank wire outlet device is simple, easy to install, and has low requirements for on-site installation.

[0007] The present invention is realized through the following technical solutions:

[0008] An oil tank wire outlet device includes an oil tank wall, a device housing, a sealing body, a limit joint, and a lead wire. The device housing is fixed on the oil tank wall. Threaded holes for the lead wire to pass through are provided on the oil tank wall and the device housing. An outlet hole is provided at one end of the device housing away from the oil tank wall, and the outlet hole is a threaded hole. The limit joint is screwed onto the device housing through the threaded hole. A number of oil-repellent spherical bodies with the same set compression amount are used as sealing bodies and filled inside the device housing, and the pressure on the sealing body deforms within a set range and does not fail. The number of sealing bodies and their compression amounts satisfy the following formula:

[0009]

[0010] In the above formula, X is the compression amount of the sealing body, N is the number of filled sealing bodies, V0 is the volume of a single sealing body in the natural state, V1 is the effective volume inside the wire outlet device excluding the lead wire, and X0 is the anti-failure compression margin.

[0011] After the unit has been running for a long time, when an individual sealing body in the wire outlet device fails, the pressure on the surrounding sealing bodies decreases accordingly, and the deformation amount increases; the sealing bodies adjacent to the sealing bodies around the failed sealing body also have a reduced pressure and an increased deformation amount. And so on, the compression amounts of the sealing bodies except the failed compression body will all change accordingly, automatically compensating for the influence of the failed sealing body on the seal.

[0012] Furthermore, the set range of the pressure on the sealing body is more than 1.5 times the internal pressure of the oil tank.

[0013] Furthermore, the deformation amount of the sealing body is positively correlated with the pressure it receives. When the pressure on the sealing body increases, the compression amount increases; when the pressure on the sealing body decreases, the compression amount decreases.

[0014] Furthermore, the compression amount of the sealing body and the pressure it bears satisfy its material deformation characteristic curve, and the number of sealing bodies and their compression amount satisfy the aforementioned relational expression. Therefore, by controlling the number of filled sealing bodies, the compression amount can be controlled, and thus the sealing pressure inside the device housing can be controlled.

[0015] Furthermore, the determination of the sealing pressure inside the device housing is related to the oil pressure at the wire outlet hole of the oil tank wall, the operating speed of the unit, the capacity of the oil tank, and the structure of the oil tank. The approximate relationship satisfies the following formula:

[0016] F2 = KF1 + F0;

[0017] In the above formula, F2 is the sealing pressure inside the device housing, F1 is the oil pressure at the wire outlet hole of the oil tank wall, K is the sealing coefficient, usually above 1.2, and F0 is the correction pressure, which is set by experience according to the operating speed of the unit and the capacity of the oil tank. F0 is usually slightly larger for high-speed units and units with a large oil tank capacity.

[0018] Furthermore, an installation sleeve is provided inside the device housing. After passing the lead wire through the wire-passing hole into the installation sleeve and leading it out from the wire outlet hole, the installation sleeve is pulled out from the wire outlet device.

[0019] Furthermore, the installation sleeve is composed of two semi-cylindrical shells.

[0020] Furthermore, there is a lubricating layer on the inner and outer surfaces of the installation sleeve to facilitate extraction.

[0021] Furthermore, the device housing includes a base and a housing wall. Matching threaded sections are provided on the base and the housing wall. After installing the sealing body into the housing wall, the base is threadedly connected to the housing wall.

[0022] Furthermore, the device housing includes a base and a housing wall. Matching threaded sections are provided on the base and the housing wall. A stuffing port is opened on the housing wall, and threads are provided inside the stuffing port. First, the base and the housing wall are threadedly connected partially. Then, using a stuffing tool, the sealing body is filled into the chamber formed after the threaded connection of the base and the housing wall through the stuffing port. After filling, the stuffing port is sealed by threadedly connecting the stuffing port seal to the stuffing port, and the housing wall is tightened partially every set time.

[0023] Furthermore, a stuffing port is opened on the device housing, and threads are provided inside the stuffing port. Using a stuffing tool, the sealing body is filled into the device housing through the stuffing port. After filling, the stuffing port is sealed by threadedly connecting the stuffing port seal to the stuffing port.

[0024] Furthermore, the wire outlet device is used as a basic unit, and multiple basic units are combined for use.

[0025] An installation method for an oil tank wire outlet device. After fixing the device housing on the oil tank wall, install the installation sleeve inward from the wire outlet hole on the device housing, and the pipe orifices at both ends of the installation sleeve respectively correspond to the wire threading hole and the wire outlet hole on the device housing. A stuffing port is provided on the device housing, with threads arranged inside the stuffing port. Using a stuffing tool, fill the sealing body into the interior of the device housing through the stuffing port. After filling is completed, connect the stuffing port seal head to the stuffing port through threading to seal the stuffing port. Then, pass the lead wire through the wire threading holes on the oil tank wall and the device housing into the installation sleeve, and then lead the lead wire out from the installation sleeve to the wire outlet hole. After that, draw out the installation sleeve, and thread the limit joint to the wire outlet hole and fasten the limit joint on the device housing to limit the lead wire.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. Compared with the traditional sealing rings and gaskets that fail when there is a single leakage point, the present invention achieves the sealing effect through the sealing body with a set same compression amount. Even if individual sealing bodies fail after long-term operation, the compression amounts of the remaining sealing bodies will change accordingly, without affecting the sealing effect, thus improving the reliability and service life of the wire outlet device.

[0028] 2. During use, the compression amount of the sealing body itself can automatically change with the pressure, which is beneficial to offset the adverse effects brought by the stirring of the oil in the oil tank and the vibration during the operation of the unit, and can better protect the lead wire.

[0029] 3. The sealing effect of the traditional wire outlet device is affected by the locking situation of the fasteners during installation. The sealing effect of the present invention is achieved without relying on fasteners, with low requirements for installation accuracy, and is convenient for use and maintenance. Brief Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a schematic structural diagram for limiting the lead wire in the present invention;

[0032] Figure 3 is an installation schematic diagram of an embodiment in the present invention;

[0033] Figure 4 is another installation schematic diagram of an embodiment in the present invention;

[0034] Figure 5 is another installation schematic diagram of an embodiment in the present invention;

[0035] Figure 6 is a schematic diagram of the stuffing port in an embodiment of the present invention;

[0036] Figure 7 is Figure 6Schematic diagram of the structure of the middle packing seal head.

[0037] Reference numerals: 1 - oil tank wall, 2 - device housing, 3 - seal body, 4 - limit joint, 5 - lead wire, 6 - mounting sleeve, 7 - base, 8 - housing wall, 9 - threaded section, 10 - packing port, 11 - packing port seal head, 1101 - cross-threaded section, 1102 - connecting section, 1103 - sealing threaded section. Specific implementation manner

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1

[0040] As Figure 1 shown, an oil tank wire outlet device includes an oil tank wall 1, a device housing 2, a seal body 3, a limit joint 4 and a lead wire 5. The device housing 2 is fixed on the oil tank wall 1. Through holes for the lead wire 5 to pass through are provided on the oil tank wall 1 and the device housing 2. An outlet hole is provided at one end of the device housing 2 away from the oil tank wall 1. The outlet hole is a threaded hole. The limit joint 4 is screwed onto the device housing 2 through the threaded hole. A plurality of oil-repellent spherical bodies with the same set compression amount are used as the seal body 3 and filled inside the device housing 2. And the pressure received by the seal body 3 deforms within a set range and does not fail. The number of the seal bodies 3 and their compression amount satisfy the following formula:

[0041]

[0042] In the above formula, X is the compression amount of the seal body 3, N is the number of the filled seal bodies 3, V0 is the volume of a single seal body 3 in the natural state, V1 is the effective volume inside the wire outlet device after removing the lead wire, and X0 is the anti-failure compression margin.

[0043] In this embodiment, the set range of the pressure received by the seal body 3 is more than 1.5 times the internal pressure of the oil tank. Through empirical setting, it is ensured that the seal body 3 is within the range of the working pressure, and the service life of the seal body 3 is extended.

[0044] The deformation amount of the seal body 3 is positively correlated with the pressure received. When the pressure received by the seal body 3 increases, the compression amount increases accordingly; when the pressure received by the seal body 3 decreases, the compression amount decreases accordingly.

[0045] The compression amount of the seal body 3 and the pressure applied to the seal body 3 satisfy its material deformation characteristic curve. The number of the seal bodies 3 and its compression amount satisfy the foregoing relationship. Therefore, by controlling the number of the filled seal bodies 3, the compression amount thereof can be controlled, and further the sealing pressure inside the device housing 2 can be controlled.

[0046] The determination of the sealing pressure inside the device housing 2 approximately satisfies the following formula with the oil pressure at the wire outlet of the oil tank wall 1, the operating speed of the unit, and the oil tank capacity:

[0047] F2 = KF1 + F0;

[0048] In the above formula, F2 is the sealing pressure inside the device housing 2, F1 is the oil pressure at the wire outlet of the oil tank wall 1, K is the sealing coefficient, usually above 1.2, and F0 is the correction pressure, which is set according to the operating speed of the unit and the oil tank capacity. F0 of high-speed units and units with large oil tank capacity is usually slightly larger.

[0049] According to the oil pressure at the wire outlet of the target oil tank wall 1, the operating speed of the unit, and the oil tank capacity, the correction pressure is set by experience to determine the sealing pressure inside the device housing 2. The compression amount of the seal body 3 and the pressure applied to the seal body 3 satisfy its material deformation characteristic curve. According to the relationship between the number of the seal bodies 3 and its compression amount, by controlling the number of the filled seal bodies 3, the compression amount thereof can be controlled, and further the sealing pressure inside the device housing 2 can be controlled to ensure the sealing performance of the wire outlet device.

[0050] After the unit has been running for a long time, individual seal bodies 3 inside the wire outlet device fail. Failure means that the seal body 3 loses its elasticity, the pressure applied to the surrounding seal bodies 3 decreases accordingly, and the deformation amount increases; the seal bodies 3 adjacent to the seal bodies 3 around the failed seal body 3 also have a decrease in pressure and an increase in deformation amount due to the pressure reduction. And so on, the compression amounts of the seal bodies 3 except the failed seal body 3 will all change accordingly to automatically make up for the influence of the failed seal body 3 on the sealing. Compared with the traditional sealing rings and gaskets that fail when there is a single leakage point, in this embodiment, the sealing effect is achieved by using the seal bodies 3 with the same set compression amount. Even if individual seal bodies 3 fail after long-term operation, the compression amounts of the remaining seal bodies 3 will change accordingly, without affecting the sealing effect, improving the reliability and service life of the wire outlet device. And during the use process, the compression amount of the seal body 3 itself can automatically change with the pressure, which is beneficial to offset the adverse effects brought by the agitation of the oil in the oil tank and the vibration during the operation of the unit, and can better protect the lead wire 5.

[0051] Further, the wire outlet device is used as a basic unit, and multiple basic units are combined for use. According to the actual wire outlet requirements, multiple basic units can be combined for use to meet the actual wiring requirements.

[0052] Embodiment 2

[0053] This embodiment further elaborates and supplements the implementation mode of the present invention on the basis of Embodiment 1.

[0054] As Figure 2 shown, an installation sleeve 6 is arranged inside the device housing 2. After the lead wire 5 is inserted into the installation sleeve 6 through the wire threading hole and led out through the wire outlet hole, the installation sleeve 6 is drawn out from the wire outlet device.

[0055] In this embodiment, the installation sleeve 6 is composed of two semi-cylindrical shells. Since the lead wire 5 is usually an uninterrupted whole long wire with a length of up to dozens of meters, the installation sleeve 6 is set as two semi-cylindrical shells, which can be separated after the device housing 2 is drawn out, and there is no need to slide to the end of the lead wire 5 for extraction, so as to facilitate installation.

[0056] Furthermore, lubricating layers are arranged on the inner and outer surfaces of the installation sleeve 6 to reduce the friction between the installation sleeve 6, the sealing body 3 and the lead wire 5, prevent damage to the sealing body 3 and the lead wire 5, and facilitate the extraction of the installation sleeve 6.

[0057] Embodiment 3

[0058] This embodiment further elaborates and supplements the implementation mode of the present invention on the basis of Embodiment 1 or Embodiment 2.

[0059] As an example, as Figure 3 shown, the device housing 2 includes a base 7 and a housing wall 8. Matching threaded sections 9 are arranged on the base 7 and the housing wall 8. After the sealing body 3 is installed into the housing wall 8, the base 7 is threadedly connected to the housing wall 8.

[0060] As another example, as Figure 4 shown, the device housing 2 includes a base 7 and a housing wall 8. Matching threaded sections 9 are arranged on the base 7 and the housing wall 8. A stuffing port 10 is formed on the housing wall 8, and threads are arranged inside the stuffing port 10. First, the base 7 and the housing wall 8 are threadedly connected partially. The sealing body 3 is filled into the cavity formed after the threaded connection of the base 7 and the housing wall 8 by using a stuffing tool through the stuffing port 10. After filling is completed, the stuffing port 11 is threadedly connected to the stuffing port 10 to seal the stuffing port 10. The housing wall 8 is tightened partially every set time. A part of the threaded section 9 is reserved initially. After running for a set time, when part of the sealing body 3 fails, the reserved part is tightened further to ensure that the sealing body 3 is within the working pressure range and extend the sealing life.

[0061] As another example, as Figure 5 - Figure 6 shown, a stuffing port 10 is formed on the device housing 2, and threads are arranged inside the stuffing port 10. The sealing body 3 is filled into the interior of the device housing 2 by using a stuffing tool through the stuffing port 10. After filling is completed, the stuffing port 11 is threadedly connected to the stuffing port 10 to seal the stuffing port 10.

[0062] As shown in Figure 7 the figure, the stuffing box sealing head 11 includes a cross-threaded section 1101, a connecting section 1102, and a sealing threaded section 1103. The function of the cross-threaded section 1101 is to facilitate the tightening of the stuffing box sealing head 11. The connecting section 1102 is used to connect the cross-threaded section 1101 and the sealing threaded section 1103 together. The function of the sealing threaded section 1103 is to cooperate with the thread of the stuffing box, and the stuffing box is closed by tightening the thread.

[0063] Embodiment 4

[0064] This embodiment adopts an oil tank wire outlet device of Embodiment 3. An installation method of an oil tank wire outlet device is as follows:

[0065] As an example, as shown in Figure 3 the figure, the device housing 2 includes a base 7 and a housing wall 8. Matching threaded sections 9 are provided on the base 7 and the housing wall 8. First, the base 7 is fixed on the oil tank wall 1, then the installation sleeve 6 is installed inward from the wire outlet hole on the housing wall 8. After the sealing body 3 is installed into the housing wall 8, the pipe orifices at both ends of the installation sleeve 6 respectively correspond to the wire passing holes on the base 7 and the wire outlet hole on the housing wall 8. The base 7 and the housing wall 8 are connected by tightening the thread. Then, the lead wire 5 is passed through the wire passing holes on the oil tank wall 1 and the base 7 into the installation sleeve 6. After the lead wire 5 is led out from the installation sleeve 6 to the wire outlet hole, the installation sleeve 6 is withdrawn, and the limit joint 4 is threadedly connected to the wire outlet hole, and the limit joint 4 is fastened to the device housing 2 to limit the lead wire 5.

[0066] As another example, as shown in Figure 4As shown, the device housing 2 includes a base 7 and a housing wall 8. Matching threaded sections 9 are provided on the base 7 and the housing wall 8. A stuffing port 10 is formed in the housing wall 8, and threads are provided inside the stuffing port 10. First, the base 7 is fixed to the oil tank wall 1, and then the installation sleeve 6 is installed inward from the wire outlet hole on the housing wall 8. The pipe orifices at both ends of the installation sleeve 6 respectively correspond to the wire passing holes on the base 7 and the wire outlet hole on the housing wall 8. The base 7 and the housing wall 8 are connected partially by tightening the threads. A sealing body 3 is filled into the chamber formed after the threaded connection between the base 7 and the housing wall 8 by using a stuffing tool through the stuffing port 10. After filling is completed, the stuffing port 10 is closed by threadedly connecting a stuffing port seal head 11 to the stuffing port 10. Then, the lead wire 5 is inserted into the installation sleeve 6 through the wire passing holes on the oil tank wall 1 and the base 7. After the lead wire 5 is led out from the installation sleeve 6 to the wire outlet hole, the installation sleeve 6 is withdrawn, and the limit joint 4 is threadedly connected to the wire outlet hole and fastened to the device housing 2 to limit the lead wire 5. The housing wall 8 is tightened partially every set time. A part of allowance is reserved for the threaded section 9 initially. After running for a set time, after part of the sealing body 3 fails, the reserved part is tightened further to ensure that the sealing body 3 is within the working pressure range and extend the sealing life.

[0067] As another example, as Figure 5 - Figure 7 shown, after the device housing 2 is fixed to the oil tank wall 1, the installation sleeve 6 is installed inward from the wire outlet hole on the device housing 2, and the pipe orifices at both ends of the installation sleeve 6 respectively correspond to the wire passing holes and the wire outlet hole on the device housing 2. A stuffing port 10 is formed in the device housing 2, and threads are provided inside the stuffing port 10. A sealing body 3 is filled into the interior of the device housing 2 by using a stuffing tool through the stuffing port 10. After filling is completed, the stuffing port 10 is closed by threadedly connecting a stuffing port seal head 11 to the stuffing port 10. Then, the lead wire 5 is inserted into the installation sleeve 6 through the wire passing holes on the oil tank wall 1 and the device housing 2. After the lead wire 5 is led out from the installation sleeve 6 to the wire outlet hole, the installation sleeve 6 is withdrawn, and the limit joint 4 is threadedly connected to the wire outlet hole and fastened to the device housing 2 to limit the lead wire 5.

[0068] The sealing effect of the traditional wire outlet device is affected by the locking condition of the fasteners during installation. The sealing effect of the present invention is achieved without relying on fasteners, has low requirements for installation accuracy, and is convenient to use and maintain.

Claims

1. An oil tank wire outlet device, comprising an oil tank wall (1), a device housing (2), a sealing body (3), a limit joint (4) and a lead wire (5), characterized in that: The device housing (2) is fixed on the oil tank wall (1). Thread holes for the lead wire (5) to pass through are provided on the oil tank wall (1) and the device housing (2). An outlet hole is provided at one end of the device housing (2) away from the oil tank wall (1). The outlet hole is a threaded hole. The limit joint (4) is screwed onto the device housing (2) through the threaded hole. A number of oil-repellent spherical bodies with the same set compression amount are used as the sealing body (3) and filled inside the device housing (2). And the pressure received by the sealing body (3) deforms within a set range and does not fail. The number of the sealing bodies (3) and their compression amount satisfy the following formula: In the above formula, X is the compression amount of the sealing body (3), N is the number of the filled sealing bodies (3), V0 is the volume of a single sealing body (3) in the natural state, V1 is the effective volume inside the outlet device excluding the lead wire, and X0 is the anti-failure compression margin.

2. The oil tank wire outlet device according to claim 1, characterized in that: The set range of the pressure received by the sealing body (3) is more than 1.5 times the internal pressure of the oil tank.

3. The oil tank wire outlet device according to claim 1, characterized in that: The deformation amount of the sealing body (3) is positively correlated with the pressure received. When the pressure received by the sealing body (3) increases, the compression amount increases accordingly; when the pressure received by the sealing body (3) decreases, the compression amount decreases accordingly.

4. The oil tank lead-out device according to claim 3, characterized in that: The compression amount of the sealing body (3) and the pressure received by the sealing body (3) satisfy its material deformation characteristic curve. The number of the sealing bodies (3) and their compression amount satisfy the aforementioned relation. Therefore, by controlling the number of the filled sealing bodies (3), the compression amount can be controlled, and further the sealing pressure inside the device housing (2) can be controlled.

5. The oil tank wire outlet device according to claim 4, characterized in that: The determination of the sealing pressure inside the device housing (2) is related to the oil pressure at the outlet hole of the oil tank wall (1), the operating speed of the unit, and the capacity of the oil tank. The approximate relation satisfies the following formula: F2 = KF1 + F0; In the above formula, F2 is the sealing pressure inside the device housing (2), F1 is the oil pressure at the outlet hole of the oil tank wall (1), K is the sealing coefficient, usually above 1.2, and F0 is the correction pressure, which is set according to the operating speed of the unit and the capacity of the oil tank.

6. An oil tank wire outlet device according to any one of claims 1-5, characterized in that: An installation sleeve (6) is provided inside the device housing (2). After the lead wire (5) is inserted into the installation sleeve (6) through the thread hole and led out from the outlet hole, the installation sleeve (6) is drawn out from the outlet device.

7. The oil tank wire outlet device according to claim 6, characterized in that: The installation sleeve (6) is composed of two semi-cylindrical shells.

8. The oil tank wire outlet device according to claim 7, characterized in that: There is a lubricating layer on the inner and outer surfaces of the installation sleeve (6) to facilitate extraction.

9. The oil tank wire outlet device according to claim 6, characterized in that: The device housing (2) includes a base (7) and a housing wall (8). Matching threaded sections (9) are provided on the base (7) and the housing wall (8). After the sealing body (3) is installed inside the housing wall (8), the base (7) is threadedly connected to the housing wall (8).

10. The oil tank wire outlet device according to claim 6, characterized in that: The device housing (2) includes a base (7) and a housing wall (8). Matching threaded segments (9) are provided on the base (7) and the housing wall (8). A stuffing port (10) is formed in the housing wall (8), and threads are provided inside the stuffing port (10). First, the base (7) and the housing wall (8) are threadedly connected in part. A sealing body (3) is filled into the chamber formed after the threaded connection of the base (7) and the housing wall (8) by using a stuffing tool through the stuffing port (10). After filling is completed, a stuffing port sealing head (11) is threadedly connected to the stuffing port (10) to close the stuffing port (10). After a set time, the housing wall (8) is tightened in part.

11. The oil tank wire outlet device according to claim 6, characterized in that: A stuffing port (10) is formed in the device housing (2), and threads are provided inside the stuffing port (10). A sealing body (3) is filled into the interior of the device housing (2) by using a stuffing tool through the stuffing port (10). After filling is completed, a stuffing port sealing head (11) is threadedly connected to the stuffing port (10) to close the stuffing port (10).

12. The oil tank wire outlet device according to claim 1, characterized in that: The wire outlet device is used as a basic unit, and multiple basic units are combined for use.

13. A method for installing an oil tank wire outlet device, characterized in that: After the device housing (2) is fixed on the oil tank wall (1), the installation sleeve (6) is installed inward from the wire outlet hole on the device housing (2), and the pipe orifices at both ends of the installation sleeve (6) respectively correspond to the wire threading hole and the wire outlet hole on the device housing (2). A stuffing port (10) is formed in the device housing (2), and threads are provided inside the stuffing port (10). A sealing body (3) is filled into the interior of the device housing (2) by using a stuffing tool through the stuffing port (10). After filling is completed, a stuffing port sealing head (11) is threadedly connected to the stuffing port (10) to close the stuffing port (10). Then, the lead wire (5) is inserted into the installation sleeve (6) through the wire threading holes on the oil tank wall (1) and the device housing (2), and then the lead wire (5) is led out from the installation sleeve (6) to the wire outlet hole. After that, the installation sleeve (6) is withdrawn, and a limit joint (4) is threadedly connected to the wire outlet hole and the limit joint (4) is fastened to the device housing (2) to limit the lead wire (5).

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