WO2010124578A1

WO2010124578A1 - Sealing device

Info

Publication number: WO2010124578A1
Application number: PCT/CN2010/071964
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: CN101876376B; CN101876376A

Abstract

A sealing device (901) comprises a sealing device main body and wires (910) which pass through the sealing device main body. The sealing device main body is composed of a sealing connecting flange (911), a sealing housing (912) and a stainless steel cover (913). The sealing connecting flange (911) and the sealing housing (912) are connected with each other. The stainless steel cover (913) passes between the sealing connecting flange (911) and the sealing housing (912). There is a first insulated baffle plate (914) in the sealing housing (912). A sealing space is encircled by the first insulated baffle plate (914), the stainless steel cover (913) and the sealing housing (912). There is a wire outlet (915) on the first insulated baffle plate (914) and the sealing housing (912) respectively. The wires (910) pass into the sealing space of the sealing device main body from the sealing connecting flange (911), and pass out of the wire outlet (915). The sealing space is filled with a sealing filler (916). This sealing device (901) is of high reliability, and is easy to install, and has a simple structure and low costs.

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 disclosed in CN101212158A 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. Phase of the wire The end faces are respectively connected to the two ends of the metal conductor, and the outer circumference of the metal conductor, the outer periphery 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 and 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 improve the problem of threading sealing in a complex environment of high pressure, especially the sealing problem of a submersible servo motor control box, the present invention proposes a sealing device having a stepped sealing structure. Summary of the invention

The technical problem to be solved by the present invention is to provide a sealing device, in particular, a sealing device capable of withstanding an external high-pressure liquid medium, which has high reliability, low cost, simple structure, and operation. Convenient, component-based design, easy installation and flexible construction 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 and a wire disposed therein, wherein the sealing device body is composed of a sealing connecting flange, a sealing housing and a stainless steel cover, and the sealing connecting flange is connected to the sealing housing a stainless steel cover is disposed between the two, and a first insulating baffle is disposed in the sealed casing, and the first insulating baffle, the stainless steel cover and the sealing casing are enclosed as a sealed space; the first insulating baffle and the sealing casing are arranged The outlets are respectively opened, and the wires penetrate into the sealed space of the sealing device body from the sealing connecting flange, and pass through the outlet; the sealed space is filled with the sealing filler. The sealing filler may be epoxy glue or any kind of high temperature resistant adhesive.

Preferably, the sealed space may further be provided with a second insulating baffle, and an outlet port is opened thereon. The second insulating baffle may be provided in more than one, and the sealed space is divided into a multi-stage sealed space.

Preferably, the number of the second insulating baffles is two.

It should be understood that the number of the second insulating baffles can be determined according to actual needs, working conditions, use conditions, pressure levels, sealing requirements, and the like.

The outlet openings formed on the adjacent two second insulating baffles are offset from each other by an angle. worth taking note of Yes, the angle of the shift will vary depending on the number of turns the wire is wound, not a fixed value.

The one or more second insulating baffles may have the same radial dimension.

Optionally, the radial dimension of the one or more second insulating baffles may also decrease one by one along the direction of the sealing connecting flange to the sealing housing, and the inner cavity of the sealing housing cooperates with the outer periphery of the second insulating baffle Set up to form a multi-stage step seal space.

The inner wall of the sealing housing may further be provided with a boss, and an inner diameter of the boss is matched with an outer diameter of the second insulating baffle.

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

1. High reliability and low cost. The invention adopts a grading seal, and the corresponding parts can be completed by using general machining, which saves cost and has no complicated process. The wires in the entire sealed space are complete, and there are no connecting parts in the middle to ensure the wires on both sides of the sealing device are turned on. Due to the structure of the grading seal, the pressure is gradually reduced layer by layer, and the reliable sealing under high pressure is achieved, and the leakage of the high pressure liquid into the low pressure chamber is also effectively prevented.

2. Simple structure and convenient operation. The sealing device has several parts that are assembled by screw connection. The sealing treatment of the wire can be completed by manual winding, and no additional equipment is required for auxiliary work.

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, before the component is cured, it can be increased or decreased according to the requirements of use. Moreover, the number of layers of the seal is increased or decreased depending on 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

1 is a schematic cross-sectional view showing the entire sealing device according to Embodiment 1 of the present invention;

2 is a schematic cross-sectional view showing the entire sealing device according to Embodiment 2 of the present invention;

Figure 3 is a perspective exploded view of the sealing device of Figure 2;

4 is a schematic view showing the overall structure of the sealing device of the present invention and the submersible servo motor and the control box. detailed description

Embodiment 1 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing the entire sealing device according to a first embodiment of the present invention. As shown in FIG. 1, the present embodiment provides a sealing device 901 that includes a sealing device body and a wire 910 disposed therein. The seal body is composed of a seal connection flange 911, a seal housing 912, and a stainless steel cover 913. The seal connection flange 911 is connected to the seal housing 912, and the stainless steel cover 913 is interposed therebetween. 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 913. It should be understood that, under the specific use occasion, the structure may be unchanged, and the non-magnetic material may be selected according to the actual situation. Magnetic material. The sealing housing 912 is a support for the entire sealing device 901. A first insulating barrier 914 is disposed within the sealed housing 912. The first insulating baffle 914, the outer wall of the stainless steel cover 913, and the inner wall of the sealing case 912 are enclosed as a sealed space. An outlet port 915 is defined in each of the first insulating baffle 914 and the sealing housing 912. The wire 910 penetrates from the sealing connecting flange 911 into the sealed space of the sealing device body, is wound in the sealed space, and then is taken out from the outlet 915. Wear it out. The seal housing 912 is threadedly coupled to the stainless steel cover 913 at its outlet 915 end and is coated with a thread sealant to seal between the seal housing 912 and the stainless steel cover 913. The sealed space is filled with a sealing filler 916, such as an epoxy glue. Of course, according to actual needs, high-temperature, viscous adhesives can also be used, which can also achieve a good sealing effect.

The specific sealing method of the wire will be described in detail in the second embodiment below, and details are not described herein again.

Further, in the sealed space surrounded by the first insulating baffle 914, the stainless steel cover 913, and the sealed casing 912, a second insulating baffle 917 may also be provided. A wire outlet (not shown) is also formed in the second insulating shutter 917 for the wire 910 to pass through.

Embodiment 2

2 is a schematic cross-sectional view showing the entire sealing device according to a second embodiment of the present invention. Figure 3 is a perspective exploded view of the sealing device of Figure 2. As shown in Figs. 2 and 3, the number of the second insulating shutters 917 of the sealing device 901 may be one or more, thereby dividing the sealed space into a multi-stage sealed space. The number of the second insulating shutters 917 is preferably two. The second insulating baffle 917 may have the same radial dimension, or alternatively, the radial dimension of the second insulating baffle 917 decreases one by one along the direction of the sealing connecting flange 911 to the sealing housing 912, and the sealing housing 912 is sealed. The inner cavity is disposed in cooperation with the outer circumference of the second insulating baffle 917. For example, the inner wall may be provided with a boss 918 for arranging the second insulating baffle thereon, the inner diameter of the boss 918 and the second insulating block. The outer diameter of the plate is matched to form a multi-stage step seal space (refer to Figures 1 and 2). The invention is mainly based on a hierarchical seal, which achieves the principle of decreasing pressure layer by layer and preventing leakage. Specifically, as shown in Fig. 2, two second insulating baffles 917 are provided in this embodiment to divide the sealed space into three-stage sealed spaces.

Wire seals are the focus of grading seals. The sealing of the wire 910 of the present invention will now be described with the embodiment shown in FIG. The sealing housing 912 is provided with several steps at a position to cooperate with the insulating baffle 917, and the figure shows three stages. The steps, that is, the formation of three counterbore with different inner diameters. According to the inner diameter from small to large, that is, along the sealed housing

The outlet 915 side of the 912 is in the direction of sealing the side of the connection flange 911, and the three steps are sequentially referred to as a first step, a second step, and a third step. Accordingly, the three counterbore holes are sequentially referred to as the first layer. Hole, second inner hole and third inner hole. The two sets of wires 910 are respectively passed through the outlets 915 on both sides of the sealed casing 912. It should be pointed out that the number of wires used is determined according to the number of actual threading, and the number of layers of the graded seal is determined by the sealing requirements, working conditions and the like. For example, as the pressure increases, the number of levels of grading increases accordingly. Taking a set of wires as an example, in the inner hole of the first layer, the wires are wound around the outer circumference of the stainless steel cover. The number of turns of the specific winding is determined according to the actual operation. After being wound, the outlet 915 of the sealed casing 912 is blocked with an easily cured anaerobic adhesive. The epoxy is then poured into the first layer of the inner hole until the epoxy is filled to the first step to stop. Then, the insulating baffle with the outlet is placed on the first step and dried in an oven. After the first layer of epoxy glue is cured, the wire is wound around the outer circumference of the stainless steel cover, and the epoxy glue is sequentially poured in the same manner as above, and the insulating baffle is covered. The sealing of the following layers is completed in the same manner in order to achieve sealing of the wires 910 in the sealed casing 912. This is to complete the stepwise sealing of the wire by layering and layering the epoxy glue. In the multi-layer seal, the wires of each layer are wound around the center of the sealed casing and then wound out through the outlet opening which is opened on the insulating plate. The outlet openings formed on the adjacent two second insulating baffles may be offset from each other by an angle. The number of turns of each layer of wire is preferably 3/8 turns or more. Therefore, the angle of the misalignment varies depending on the number of turns of the wire, and is not constant.

4 is a schematic view showing the overall structure of the sealing device of the present invention and the submersible servo motor and the control box. As shown in FIG. 4, the sealing device 901 is interposed between the submersible motor 902 and the control box 903, and is connected to the submersible motor 902 and the control box 903. Specifically, the sealed housing 912 of the sealing device 901 is connected to the control box 903 at its outlet 915 end, which is a low pressure chamber end, which can be connected by threads. Sealing of sealing device 901 Connection flange 911 is connected to submersible motor 902, which is a high pressure side, which can be connected by bolts. The sealing flange 911 is connected to the sealing housing 912, for example, by threading.

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. In addition, the sealing device of the present invention is suitable for a wide range of pressures, and is particularly suitable for use in high pressure applications. The seal is highly reliable, easy to install, simple in construction and low in cost.

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 and a wire disposed therein, wherein the sealing device body is composed of a sealing connecting flange, a sealing housing and a stainless steel cover, and the sealing connecting flange and the sealing shell The body is connected, the stainless steel cover is disposed between the two, the first insulating baffle is disposed in the sealed casing, and the first insulating baffle, the stainless steel cover and the sealing shell are enclosed as a sealed space; the first insulating baffle and the sealing shell An outlet port is respectively formed on the body, and the wire penetrates into the sealing space of the sealing device body from the sealing connecting flange, and passes through the outlet port; the sealing space is filled with the sealing filler.

2. The sealing device according to claim 1, wherein a second insulating baffle is further disposed in the sealed space, and an outlet port is opened on the second insulating baffle.

The sealing device according to claim 2, wherein the number of the second insulating baffles is one or more, and the sealed space is divided into a multi-stage sealed space.

The sealing device according to claim 3, wherein the number of the second insulating baffles is preferably two.

The sealing device according to any one of claims 3 to 4, wherein the outlet openings formed on the adjacent two second insulating baffles are offset from each other by an angle.

The sealing device according to any one of claims 3 or 4, wherein the one or more second insulating baffles have the same radial dimension.

The sealing device according to any one of claims 3 or 4, wherein the radial dimension of the one or more second insulating baffles decreases one by one along the direction of sealing the connecting flange to the sealing housing, The inner cavity of the sealed casing is matched with the outer periphery of the second insulating baffle to form a multi-stage step seal space.

The sealing device according to claim 7, wherein the inner wall of the sealing housing is provided with a boss, and an inner diameter of the boss is matched with an outer diameter of the second insulating baffle.