WO2010124575A1

WO2010124575A1 - Sealing device

Info

Publication number: WO2010124575A1
Application number: PCT/CN2010/071950
Authority: WO
Inventors: 郝双晖; 郝明晖
Original assignee: 浙江关西电机有限公司
Priority date: 2009-04-30
Filing date: 2010-04-21
Publication date: 2010-11-04
Also published as: CN101876375B; CN101876375A

Abstract

A sealing device (971) has a sealing device main body which is comprised of a connecting flange (951), a sealed housing (952) and a stainless steel cap (953), wherein the connecting flange (951) is connected with the sealed housing (952); the stainless steel cap (953) is provided between the connecting flange (951) and the sealed housing (952); a sealing block (956) and a first insulating plate (957) are respectively arranged on either end of the inner cavity of the sealed housing (952); the sealing block (956), the first insulating plate (957), the stainless steel cap (953) and the sealed housing (952) are enclosed to form a sealed space, and a pressing block (958) is arranged between the sealing block (956) and the connecting flange (951). Through holes are respectively formed on the sealing block (956), the first insulating plate (957) and the sealed housing (952), and a first copper rod (954) runs from the through hole of the sealing housing (952) to the sealed space of the sealing device main body and out of the first insulating plate (957), wherein the sealed space is filled with sealing filler (959). The high-pressure sealing threading device has the advantages of high reliability, low cost, simple structure, convenient operation, modularization design, and convenient installation, and the structure of which can be flexibly changed as required.

Description

Sealing means

Technical field

The present invention relates to a sealing device, and more particularly to a sealing device capable of withstanding an external high-pressure liquid medium, and belongs to the field of sealing technology. Background technique

The sealing of mechanical equipment has always been an important issue. If the sealing is not good, it will directly affect the performance of the equipment, even directly causing the equipment to fail. Especially on the inner and outer sides of the equipment are high-pressure liquid medium and low-pressure air chamber, respectively. Where there is a wire connection, the seal at the wire has a critical impact on the performance of the device.

The submersible electric pump system is an important equipment for oil field production. For the traditional submersible electric pump system, the electric motor used is a three-phase asynchronous motor. With the increasing attention of the oil field to the efficiency and energy saving of the oil production equipment, and the development of new technologies. The development of servo submersible motors has become a trend. Traditional submersible electric pump systems, control systems are placed on land, and the development of efficient submersible servo motors requires the control system to be placed downhole with the motor. In this case, the body of the motor is filled with high-pressure liquid, and the oil well is a high-pressure oil-water mixed liquid, that is, the equipment is surrounded by a high-pressure oil-water mixed liquid. However, liquid is not allowed in the control box with the servo controller installed. In addition, the control signal line and the three-phase power line of the motor must enter the motor body from the control box. The control box is air, and the motor body casing and well are high-pressure liquid, which creates a huge pressure difference between the control box and the motor. In other words, the control box is a low pressure chamber and the outside of the control box is a high pressure medium. At this time, it is necessary to ensure that the power line, signal line, and motor power line of the system pass through the control box, and the sealing of the control box is ensured, thereby preventing the high-pressure liquid from leaking into the inside of the control box and causing the equipment to malfunction.

As mentioned above, in order to solve the problem of ensuring the sealing between the high-pressure liquid side and the low-pressure side and ensuring the penetration of the wire, it is common practice to provide an inlet sealing ring on the outer circumference of the wire, and the cable gland will be used. The inlet sealing ring is pressed tightly, and the sealing is achieved by the pressure deformation of the inlet sealing ring. However, this only seals the gap between the incoming wire seal and the outer circumference of the wire. Once the cable is damaged or a leak occurs between the wire and the incoming wire seal, it will directly lead to the liquid entering the low pressure chamber, causing damage or failure of the components in the low pressure chamber, resulting in the device not functioning properly.

The document of the publication No. CN109529529558A discloses a cable sealing structure for a submersible motor, the purpose of which is to isolate the side with the liquid and the side of the low-pressure air, while at the same time ensuring the communication between the cable and the internal wires of the motor. The structure consists of a rubber vulcanized casting head and two sections of cables. The two sections of cables are respectively arranged in the two end faces of the rubber vulcanization casting head. A metal conductor is arranged between the opposite end faces of the two sections of cables. Wire The opposite end faces are respectively connected to the two ends of the metal conductor, and the outer circumference of the metal conductor, the outer circumference of the joint of the metal conductor and the two sections of the cable are surrounded by the insulating heat shrinkable sleeve, the rubber vulcanized casting head and the two sections of the cable and the insulation heat shrinkage The sleeve is sealed. This structure is not suitable for high-pressure applications, especially for submersible servo systems. This is because the inside of the motor is high-voltage motor oil, and the outside is a complex well fluid, that is, a mixture of various liquids. This structure has the following drawbacks:

1. In the case of high temperature and high pressure, the insulated heat shrinkable sleeve is used, which has limited pressure, which is not conducive to high pressure sealing in complex environments;

2. This structural form is not suitable for application in the submersible servo electric pump system;

3. The connection of the cables on both sides of the vulcanized casting head is unreliable, which is easy to cause an open circuit;

4. The structure process is relatively complicated, which increases the cost of processing and manufacturing.

In order to solve the problem of the sealing of the downhole control box and the motor encoder system in the submersible servo pumping system; the downhole circuit communication; and the problem of ensuring the effective operation of the submersible servo motor sensor system, the present invention proposes a sealing device. Summary of the invention

The technical problem to be solved by the present invention is to provide a sealing device, particularly a sealing device capable of withstanding an external high-pressure liquid medium, in view of the deficiencies of the prior art. The high-pressure sealing threading device adopts a step-by-step sealing method to reduce the pressure layer by layer, overcomes the defects in the prior art, is sealed by a plurality of layers of epoxy resin, so the sealing effect is reliable and stable, and the component design makes the installation convenient and the cost lower. The structure is simplified, the operation is convenient, and the structure can be flexibly changed as needed.

The technical problem to be solved by the present invention is achieved by the following technical solutions:

A sealing device comprising a sealing device body, wherein the sealing device body is composed of a connecting flange, a sealing shell and a stainless steel cover, the connecting flange is connected with the sealing shell, and the stainless steel cover is disposed between the two, the sealing shell A sealing block and a first insulating plate are respectively disposed at two ends of the inner cavity, and the sealing block, the first insulating plate, the stainless steel cover and the sealing shell are arranged as a sealing space, and a pressing block is arranged between the sealing block and the connecting flange; A through hole is respectively formed in the sealing block, the first insulating plate and the sealing shell. It should be noted that the inner diameter of the through hole of the sealing housing must be larger than the outer diameter of the copper rod to prevent the sealing between the sealing housing and the copper rod. through. However, the inner diameter of the through hole on the insulating baffle and the outer diameter of the copper rod are theoretically equal, and of course, a large point is also possible. The first copper rod penetrates from the through hole of the sealing case into the sealed space of the sealing device body, and passes through the first insulating plate; the sealing space is filled with the sealing filler.

Preferably, the first copper rod is stepped, and the outer diameter of the stepped column disposed at the middle portion is larger than the outer diameter of the copper rod at both ends, and the lower stepped surface of the stepped column is in contact with the first insulating plate. Such a structure can transfer the pressure on the first copper rod to the sealed casing through the first insulating plate. In order to facilitate the conduction of the two sides of the circuit, the end of the first copper rod is provided with a connection plug.

Preferably, a second insulating plate is disposed between the first insulating plate and the sealing block, and a second copper bar is disposed in the sealed space enclosed by the second insulating plate and the sealing block; the first copper bar is sealed from the sealing case The through hole penetrates into the sealed space of the sealing device body, passes through the first insulating plate, and passes through the second insulating plate to meet the second copper bar end to end; the second copper bar passes through the through hole of the sealing block .

Optionally, a support plate may be disposed between the first insulating plate and the second insulating plate, and a through hole is defined in the upper insulating plate and the second insulating plate. It should be noted that the inner diameter of the through hole of the support plate must be larger than the outer diameter of the copper rod to prevent conduction between the support plate and the copper rod.

In addition, the inner cavity of the sealed casing is provided with a boss, and the support plate can be fixed to the boss.

It can be understood that the number of the second insulating plate and the second copper bar is more than one, and the sealing space is divided into a multi-stage sealing space.

Optionally, a support plate may be disposed between the two adjacent second insulating plates, and a through hole is defined in the second insulating plate. In addition, the inner wall of the sealed casing is provided with a boss, and the support plate can be fixed on the boss.

Optionally, the first copper rod and the second copper rod are connected by a screw.

Preferably, the second copper rod is stepped, and one end is provided as a stepped column, and the outer diameter of the cylindrical body is larger than the outer diameter of the second copper rod at the other end, and the lower stepped surface of the stepped column is in contact with the second insulating plate.

The end of the second copper rod is provided with a connection plug so that the two sides of the circuit are turned on.

The inner diameter of the through hole formed in the sealing housing is larger than the outer diameter of the first copper rod to prevent conduction between the sealing housing and the first copper rod.

The inner diameter of the through hole formed in the support plate is larger than the outer diameter of the first copper rod or the second copper rod to prevent conduction between the support plate and the first copper rod or the second copper rod.

Compared with the prior art, the beneficial effects of the invention are:

1. High reliability and low cost. This application uses a graded seal, and the corresponding parts can be completed by general machining, which saves costs and has no complicated process. Due to the structure of the stepped seal, the pressure is gradually reduced layer by layer, and the reliable sealing under high pressure is also effectively prevented, and the leakage of the high pressure liquid into the low pressure chamber is effectively prevented.

2. Simple structure and convenient operation. The sealing device has several parts that are assembled by screwing.

3, component design, easy to install. Both ends of the sealing device are connected by threads or bolts, and the installation is convenient. For the connection of the wires, as long as the wires are installed on the wires on both sides of the sealing device, the wires are respectively connected to the wires in the chambers on both sides of the sealing device. In addition to the application of submersible motors, it can also be used in other high pressure sealing applications.

4. The structure can be flexibly changed as needed. For the number of wires passing through the seal, the component is cured Before, it can be increased or decreased according to the requirements of use. Moreover, the number of layers of the seal is increased or decreased according to the pressure of the application, and the number of seal layers is increased in the case of a large pressure to enhance the sealing effect.

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. DRAWINGS

Figure 1 is a schematic view showing the entire structure of the sealing device of the present invention;

Figure 2 is a second schematic view of the overall structure of the sealing device of the present invention;

Figure 3 is a cross-sectional view showing a sealing device according to a first embodiment of the present invention;

Figure 4 is a schematic view showing the structure of the first copper rod in the sealing device;

Figure 5 is a cross-sectional view showing a sealing device in accordance with a second embodiment of the present invention;

Figure 6 is a schematic structural view of a second copper rod in the sealing device of Figure 4;

Figure 7 is a schematic view showing the overall structure of the mounting of the sealing device. detailed description

Fig. 1 is a schematic view showing the entire structure of a sealing device of the present invention. Fig. 2 is a second schematic view showing the entire structure of the sealing device of the present invention. Figures 1 and 2 show the two ends of the sealing device, respectively. As shown in Fig. 1 and Fig. 2, the present invention provides a sealing device 971 which is modular in design and has a wire plug 955 at each end thereof for facilitating wire connection at both ends. One end of the sealing device 971 is a connecting flange 951, and the other end is threaded, which is convenient for connection with the submersible servo motor 972 and the control box 973 (refer to FIG. 7) at both ends. Embodiment 1

Figure 3 is a cross-sectional view showing a sealing device of a first embodiment of the present invention. As shown in FIG. 3, the sealing device comprises a sealing device body. The sealing device body is composed of a connecting flange 951, a sealing housing 952 and a stainless steel cover 953. The connecting flange 951 is connected to the sealing housing 952, and the stainless steel cover 953 An encoder system is provided between the two for mounting the submersible servo motor 972. In the present invention, in order to meet the needs of the submersible servo motor, a non-magnetic material is used to form the stainless steel cover 953. It should be understood that, under certain conditions of use, the structure may be unchanged, and the non-magnetic material may be selected according to actual conditions. Magnetic material. A sealing block 956 and a first insulating plate 957 are respectively disposed at two ends of the inner cavity of the sealing housing 952. The sealing block 956, the first insulating plate 957, the stainless steel cover 953, and the sealing case 952 are enclosed as a sealed space. A pressing block 958 is disposed between the sealing block 956 and the connecting flange 951; a through hole is defined in the sealing block 956 and the first insulating plate 957, respectively. The bottom end of the sealing housing 952 is also provided with a hole for passing the copper rod. The bottom end of the casing 952 is viewed upwardly, and the aperture is larger than the outer diameter of the first copper rod 954, thereby preventing conduction between the sealed casing and the copper rod. In addition, the inner diameter of the through hole on the insulating baffle and the outer diameter of the copper rod are theoretically equal, and of course, a large point is also possible. The first copper rod 954 penetrates from the through hole of the sealing case 952 into the sealed space of the sealing device body, and is passed out from the first insulating plate 957. The sealed space is filled with a sealing filler 959, such as an epoxy resin. Epoxy resin has high bearing capacity, good bonding performance, stable chemical properties and excellent insulation performance. It is separated by epoxy resin to provide better insulation and sealing effect between the copper rods of the sealing device.

Figure 4 is a schematic view showing the structure of the first copper rod in the sealing device. As shown in FIG. 4, the first copper rod 954 is stepped, that is, in the form of a middle thick, two-stepped stepped shaft, and the outer diameter of the stepped column 963 disposed at the middle portion is larger than the outer diameter of the copper rod at both ends, the stepped column 963 The lower step surface is in abutting contact with the first insulating plate 957. Through this step, the first copper rod 954 is prevented from being pressed by the excessive pressure, and the pressure is transmitted to the first insulating plate 957, so that the pressure is uniform, and the pressure is transmitted to the sealed casing 952 through the first insulating plate 957. Bottom end. Further, the end of the first copper rod 954 is provided with a connection plug 955. Embodiment 2

Figure 5 is a cross-sectional view showing a sealing device in accordance with a second embodiment of the present invention. As shown in FIG. 5, a second insulating plate 960 may be disposed between the first insulating plate 957 and the sealing block 956. The insulating plate may be a high-strength insulating plate, and a hole for passing the copper rod is opened thereon, and a second copper rod 961 is disposed in the sealing space surrounded by the insulating plate 960 and the sealing block 956; the first copper rod 954 penetrates from the through hole of the sealing housing 952 into the sealed space of the sealing device body, from the first insulating plate The 957 is pierced and connected to the second copper rod 961 through the second insulating plate 960; the second copper rod 961 passes through the through hole of the sealing block 956.

Further, a support plate 962 may be disposed between the first insulating plate 957 and the second insulating plate 960, and the support plate 962 is provided with a through hole. It should be noted that the inner diameter of the through hole formed in the support plate 962 is larger than the outer diameter of the first copper rod 954 or the second copper rod 961 to prevent the support plate 962 from being between the first copper rod 954 or the second copper rod 961. Turn on. Further, a boss 965 is provided on the inner cavity of the seal housing 952, and the support plate 962 can be fixed to the boss 965.

Figure 6 is a schematic view showing the structure of a second copper rod in the sealing device. As shown in FIG. 6, the second copper rod 961 is also stepped, that is, in the form of a stepped shaft. The bottom end is a thick stepped column 964, the outer diameter of the cylindrical body is larger than the outer diameter of the other end, and the lower stepped surface of the stepped post 964 is in abutting contact with the second insulating plate 960. Since the lower end of the second copper rod 961 is thicker and in contact with the second insulating plate 960, the pressure applied to the second copper rod 961 is evenly distributed to the second insulating plate 960, and then transmitted to the lower supporting plate 962, and finally transmitted. To the sealed housing 952. The copper rod is in the form of a stepped shaft, which can prevent the wire from being directly pressed out of the sealing device due to excessive pressure in the potted epoxy layer, resulting in seal failure. In addition, A threaded hole is provided in the thick stepped column 964 for connection with the first copper rod 954, thereby achieving conduction between the first copper rod 954 and the second copper rod 961 in the sealing device. A connector plug 955 is provided at the end of the smaller outer diameter of the second copper bar 961.

The mounting and sealing process of the sealing device of the present invention will be briefly described below with respect to this embodiment.

First, the first insulating plate 957 is fixedly mounted. The first copper rod 954 is then passed through the hole in the first insulating plate 957 until the lower surface of the intermediate step of the first copper rod 954 is in contact with the first insulating plate 957, at which time the first copper rod 954 has also passed through the seal. The bottom hole of the housing 952. Epoxy is then cast into the cavity formed between the first insulating sheet 957 and the bottom end of the sealed housing 952.

After the first layer of epoxy resin is solidified, a second layer of epoxy resin is cast while pressing the support plate 962. The aperture formed in the support plate 962 is larger than the outer diameter of the first copper rod 954 so that the first copper rod 954 can pass smoothly. A third layer of epoxy is recast and a second insulating sheet 960 is applied.

After the third layer of epoxy resin is solidified and the second insulating plate 960 is installed, the first copper rod 954 (shown in FIG. 4) and the second copper rod 961 (shown in FIG. 6) are connected by threads. . At this time, the fourth layer of epoxy tree is poured, and the sealing block 956 is pressed at the same time. In this particular embodiment, the four layers of epoxy provide a good layered sealing effect.

The compression block 958 is then screwed through the threads in the seal housing 952 to compress the seal block 958.

Finally, the upper connecting flange 951 is attached, and the connecting flange 951 is screwed to the sealing housing 952.

It is to be understood that the number of the second insulating sheets 960 and the second copper rods 961 may be set to be plural depending on the specific circumstances and needs, thereby dividing the sealed space into a multi-stage sealed space. A support plate 962 may be disposed between the adjacent two second insulating plates 960, and a through hole is formed in the support plate 962.

Figure 7 is a schematic view showing the overall structure of the mounting of the sealing device. As shown in Fig. 7, the sealing device 971 is interposed between the submersible servo motor 972 and the control box 973, and is connected to the submersible servo motor 972 and the control box 973. Specifically, the sealing housing 952 of the sealing device 971 is connected to the control box 973 at the end through which the first copper rod 954 passes, for example, by threading. The sealing connection flange 951 of the sealing device 971 is connected to the submersible servo motor 972, for example by bolts.

As can be seen from the above, the present invention overcomes the drawbacks of the prior art by using a stepwise seal to reduce the pressure layer by layer, so that the control system can be placed downhole with the motor. The seal has an integrated design that reduces cost, is simple in construction and can be flexibly designed to suit your needs. In addition, the sealing device of the invention is sealed by a plurality of layers of epoxy resin, so that the sealing effect is reliable and stable, and is suitable for a wide pressure range, and is particularly suitable for high pressure applications. Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and not limiting. While the present invention has been described in detail with reference to the embodiments of the embodiments of the present invention, it is understood that the invention may be modified and equivalents without departing from the spirit and scope of the present invention. Within the scope of the claims of the present invention.

Claims

Claim

A sealing device comprising a sealing device body, wherein the sealing device body is composed of a connecting flange, a sealing shell and a stainless steel cover, the connecting flange is connected with the sealing shell, and the stainless steel cover is disposed at two Between the two ends of the inner cavity of the sealed casing, a sealing block and a first insulating plate are respectively arranged, and the sealing block, the first insulating plate, the stainless steel cover and the sealing shell are enclosed as a sealing space, and between the sealing block and the connecting flange a pressing block is disposed; a through hole is respectively formed in the sealing block, the first insulating plate and the sealing shell, and the first copper rod penetrates from the through hole of the sealing housing into the sealed space of the sealing device body, from the first insulation The plate is worn out; the sealed space is filled with a sealing filler.

2. The sealing device according to claim 1, wherein the first copper rod is stepped, and an outer diameter of the outer diameter of the stepped column disposed at the middle portion is larger than the outer diameter of the copper rod at both ends, and the lower step of the stepped column The surface is in contact with the first insulating plate.

3. The sealing device according to claim 2, wherein the end of the first copper rod is provided with a connection plug.

4. The sealing device according to claim 1, wherein a second insulating plate is further disposed between the first insulating plate and the sealing block, and the second insulating plate and the sealed space enclosed by the sealing block are worn through. a second copper rod is disposed; the first copper rod penetrates from the through hole of the sealing housing into the sealed space of the sealing device body, passes through the first insulating plate, and passes through the second insulating plate and the second copper rod The second copper rod is pierced from the through hole of the sealing block.

The sealing device according to claim 4, wherein a support plate is further disposed between the first insulating plate and the second insulating plate, and a through hole is defined in the upper insulating plate and the second insulating plate.

The sealing device according to claim 5, wherein the inner cavity of the sealing housing is provided with a boss, and the supporting plate is fixed on the boss.

The sealing device according to claim 4, wherein the number of the second insulating sheets and the second copper rods is one or more, and the sealed space is divided into a multi-stage sealed space.

The sealing device according to claim 7, wherein a support plate is disposed between the two adjacent second insulating plates, and a through hole is formed in the second insulating plate.

9. The sealing device according to claim 8, wherein the inner cavity of the sealing housing is provided with a boss, and the supporting plate is fixed on the boss.

10. The sealing device according to claim 4, wherein the first copper rod and the second copper rod are connected by a screw.

The sealing device according to any one of claims 4 to 10, wherein the second copper rod is stepped, and one end is provided as a stepped column, and the outer diameter of the cylinder is larger than the second copper rod at the other end. Trail, the step of the step The step surface is in contact with the second insulating plate.

The sealing device according to claim 11, wherein the end of the second copper rod is provided with a connection plug.

13. The sealing device according to claim 1, wherein an inner diameter of the through hole formed in the sealing housing is larger than an outer diameter of the first copper rod.

The sealing device according to any one of claims 5 or 8, wherein the inner diameter of the through hole formed in the support plate is larger than the outer diameter of the first copper rod or the second copper rod.