Buried transformer

Abstract

The invention discloses a buried transformer, and belongs to the field of transformers. The buried transformer comprises a machine body, a connecting wire with an insulating layer is arranged on the machine body, a supporting ring and a supporting block are connected to the machine body, a propelling cylinder is connected to the supporting block, and an electric telescopic rod is fixedly connected to the supporting ring; a pushing rod is slidably connected into the pushing cylinder, the driving end of the electric telescopic rod is connected with the pushing rod, symmetrical clamping rings are connected to the pushing rod in a lifting mode, tension springs are connected between the clamping rings and the pushing rod, and a guiding ring is slidably connected into the pushing cylinder. The clamping ring and the guide ring are provided with inclined surfaces which are matched with each other; the clamping ring clamps the connecting line and drives the connecting line to be pushed forwards, so that the connecting line is inserted into the cavity, and the connecting line is pushed forwards in a reciprocating mode.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to an underground transformer. Background Art

[0002] As the name suggests, transformers regulate voltage during power transmission. This is especially true in cities and towns where large amounts of electricity are consumed and a large number of transformers are required. At the same time, land use requirements in cities and towns are also relatively high, so some high-voltage wires or transformers are located underground. Underground transformers have a small footprint and strong environmental adaptability; they are widely used in urban power grid transformation, residential areas, commercial centers, parks and other places.

[0003] Underground transformers are buried underground and generally use fully sealed and anti-corrosion materials. The transformer is required to have waterproof, moisture-proof and corrosion-resistant properties. Generally, the ground is hollowed out in advance, and waterproof materials are prefabricated to form a transformer installation space, and then the transformer is installed inside. At the same time, holes need to be reserved to lead the connecting wires on the transformer through the holes to the corresponding electrical equipment. In the existing method, after the transformer is installed, the connecting wires are manually inserted into the holes and then pushed to the corresponding electrical equipment. On the one hand, the transformer wires are wrapped in an insulating layer, which is relatively thick and heavy, and more laborious. On the other hand, after being inserted into the cavity, there is a gap between the cavity and the connecting wire, which has a penetration effect on underground rainwater. It is not ruled out that it will seep into the cavity and then enter the installation space of the transformer from the cavity. The waterproof effect needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art of laborious manual plugging of electric wires and the lack of sealing between the electric wires and underground holes, which makes them prone to water seepage, and to propose an underground transformer.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The underground transformer comprises a body, a connecting wire with an insulating layer is provided on the body, a support ring and a support block are connected to the body, a propulsion cylinder is connected to the support block, and an electric telescopic rod is fixedly connected to the support ring; A push rod is slidably connected in the propulsion cylinder, a driving end of the electric telescopic rod is connected to the push rod, a symmetrical clamping ring is lifted and connected to the push rod, a tension spring is connected between the clamping ring and the push rod, a guide ring is slidably connected in the propulsion cylinder, the clamping ring and the guide ring are both provided with mutually matching inclined surfaces, a first spring is connected between the guide ring and the propulsion cylinder, and the elastic force of the first spring is greater than the tension of the tension spring; The electric telescopic rod pushes the push rod to move, and the push rod drives the clamping ring to move close to the guide ring. The symmetrical clamping ring clamps the connecting line and drives the connecting line forward; One end of the propulsion cylinder inserted into the ground wire hole is covered with a blocking airbag, and the inner sides of the symmetrical clamping rings are each provided with a plurality of sealing airbag rings.

[0006] In order to facilitate the resetting of the push rod, preferably, a resetting tension spring is connected between the push rod and the propulsion cylinder.

[0007] In order to achieve a sealing effect, preferably, the abutting sides of the symmetrical clamping rings are each provided with a plurality of groups of staggered sealing strips.

[0008] In order to achieve better sealing of the blocking airbag, preferably, a cylinder body is fixedly connected to the inner wall of the propulsion cylinder, a push rod is slidably and sealedly connected to the cylinder body, the cylinder body is connected to the blocking airbag through a first one-way air outlet pipe, and a one-way air inlet pipe is connected to the cylinder body. When the clamping ring and the guide ring are pushed forward, the guide ring pushes the push rod.

[0009] In order to facilitate the resetting of the push rod, a second spring is further provided between the inner wall of the cylinder and the push rod.

[0010] In order to achieve delayed resetting of the guide ring, further, a first magnet is connected to the point where the guide ring and the push rod abut against each other, a second magnet attracted to the first magnet is connected to the point where the push rod and the guide ring abut against each other, and the one-way air intake pipe adopts a thin tube.

[0011] In order to store excess gas, the inner wall of the propulsion cylinder is further fixedly connected with an air storage ring and a sealing air bag, a first solenoid valve is connected between the air storage ring and the sealing air bag, and a second one-way air outlet pipe is connected between the air storage ring and the cylinder body.

[0012] In order to firmly lock the clamping ring and the guide ring, further, a stabilizing ring corresponding to the guide ring is fixedly connected to the inner wall of the propulsion cylinder, a plug post is slidably connected in the stabilizing ring, and the clamping ring and the guide ring are provided with a socket corresponding to the plug post.

[0013] In order to insert the column into the socket, a sliding groove is further provided on the stabilizing ring, the column sliding seal is connected in the sliding groove, a reset spring is connected between the column and the sliding groove, the upper end of the sliding groove is connected to the air storage ring through a connecting pipe, and a second solenoid valve is connected to the connecting pipe.

[0014] In order to realize the delivery of airflow to the sealing airbag ring, further, a through hole with a pressure relief valve is opened on the plug post, the through hole is connected with the upper end of the sliding groove, and the sealing airbag ring is connected with the socket through a delivery pipe. When the plug post is inserted into the socket, the through hole is connected with the delivery pipe.

[0015] Compared with the prior art, the present invention provides an underground transformer with the following beneficial effects: The underground transformer uses an electric telescopic rod to push the push rod to move. The clamping ring clamps the connecting wire while moving forward. The clamping ring clamps the connecting wire and drives the connecting wire forward, thereby inserting the connecting wire into the cavity and moving it forward reciprocally, replacing the current manual insertion method. At the same time, the sealing airbag ring at the connection between the connecting wire and the clamping ring can achieve a sealing effect, and the sealing airbag ring can also ensure that the clamping ring better clamps the connecting wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the propulsion tube structure of the present invention; Figure 3 This is a schematic diagram of the explosion structure of the propulsion tube of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at B in the middle; Figure 6 Schematic diagram of the cross-sectional structure of the propulsion tube of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at C in the middle; Figure 8 For the present invention Figure 6 Schematic diagram of the structure at D in the middle; Figure 9 For the present invention Figure 8 Schematic diagram of the structure at E in the middle.

[0017] In the figure: 1. Body; 101. Connecting line; 2. Support ring; 3. Support block; 4. Propulsion cylinder; 401. Sealing airbag; 5. Electric telescopic rod; 6. Reset spring; 7. Push rod; 701. Tension spring; 8. Clamping ring; 801. Sealing airbag ring; 802. Sealing strip; 803. Plug hole; 804. Delivery pipe; 9. Guide ring; 10. First spring; 11. Cylinder; 12. Push rod; 13. Second spring; 14. First one-way air outlet pipe; 15. One-way air inlet pipe; 16. Second one-way air outlet pipe; 17. Air storage ring; 18. Sealing airbag; 19. First solenoid valve; 20. Stabilizing ring; 21. Sliding groove; 22. Connecting pipe; 23. Insert column; 24. Reset spring; 25. Through hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Example 1: Reference Figure 1 The underground transformer includes a body 1 on which a connecting wire 101 with an insulating layer is provided. In the actual installation process, the body is hoisted as a whole and installed in an installation space prefabricated underground.

[0020] Reference Figure 2 , the end of the connecting line 101 is inserted into the propulsion cylinder 4 at the factory, and the body 1 is connected to the support ring 2 and the support block 3. During the specific production and manufacturing, according to the use requirements, the support ring 2 and the support block 3 can be fixed to the corresponding body 1 by screws, or slidably connected to the body 1, or directly welded to the body 1, and connected according to the needs. The support block 3 is connected to the propulsion cylinder 4. During the specific production and manufacturing, the propulsion cylinder 4 can be set to slide on the support block 3 and locked by the corresponding screws. The support ring 2 is fixedly connected to the electric telescopic rod 5; Reference Figure 3 、 Figure 6 and Figure 7 Specifically, when the connecting wire 101 is inserted into the hole for external electrical equipment, the specific operation plan is as follows: a push rod 7 is slidably connected to the propulsion cylinder 4, and the push rod 7 is slidably arranged on the inner wall of the propulsion cylinder 4 through a fixed limit slider. A corresponding limit slide groove is provided on the inner wall of the propulsion cylinder 4 to ensure the stable sliding of the push rod 7, and the driving end of the electric telescopic rod 5 is connected to the push rod 7. A symmetrical clamping ring 8 is connected to the push rod 7 for lifting and lowering, and a lifting block is fixedly connected to the clamping ring 8. A lifting groove corresponding to the lifting block is provided on the push rod 7, and a tension spring 701 is connected between the clamping ring 8 and the push rod 7, and the tension spring 701 is connected to the lifting groove. A guide ring 9 is slidably connected in the propulsion cylinder 4, and the clamping ring 8 and the guide ring 9 are provided with inclined surfaces matching each other. A first spring 10 is connected between the guide ring 9 and the propulsion cylinder 4, and the elastic force of the first spring 10 is greater than the tension of the tension spring 701.

[0021] Reference Figure 3 and Figure 4, place one end of the propulsion tube 4 with the blocking airbag 401 at the corresponding wiring hole, start the electric telescopic rod 5, the electric telescopic rod 5 pushes the push rod 7 to move, and the push rod 7 drives the clamping ring 8 to move close to the guide ring 9. The clamping ring 8 and the guide ring 9 are both provided with mutually matching inclined surfaces, and the elastic force of the first spring 10 is greater than the tension of the tension spring 701. The clamping ring 8 will clamp the connecting line 101 while moving forward. After the clamping ring 8 is close to the guide ring 9 and in place, the symmetrical clamping ring 8 clamps the connecting line 101 and drives the connecting line 101 is pushed forward, thereby realizing the insertion of the connecting wire 101 into the hole. After moving one end distance, the electric telescopic rod 5 pulls back the push rod 7, and the clamping ring 7 is quickly withdrawn. The reset tension spring 6 is connected between the push rod 7 and the propulsion cylinder 4. The reset tension spring 6 also facilitates rapid return to its original position. When the guide ring 9 is disengaged, the clamped connecting wire 101 is released. After the guide ring 9 is withdrawn into place, the push rod 7 is pushed again to realize the advancement. In this way, the connecting wire 101 is continuously inserted into the hole, and the connecting wire 101 is inserted. No manual operation is required, which saves effort. Reference Figure 3 、 Figure 4 and Figure 5 The end of the propulsion tube 4 inserted into the ground wire hole is covered with a sealing airbag 401, and the inner side of the symmetrical clamping ring 8 is provided with multiple sealing airbag rings 801. The end of the propulsion tube 4 is inserted into the hole, and then the sealing airbag 401 is used to perform preliminary sealing. At the same time, after the propulsion is completed, the push rod 7 presses against the clamping ring 8 and the guide ring 9, and the sealing airbag ring 801 at the connection between the connecting line 101 and the clamping ring 8 can play a sealing effect. At the same time, the sealing airbag ring 801 can also ensure that the clamping ring 8 better clamps the connecting line, which is convenient for propulsion; the symmetrical clamping rings 8 are provided with multiple groups of staggered sealing strips 802 on the abutting sides to ensure the sealing of the symmetrical connections of the clamping rings 8.

[0022] Example 2: Reference Figure 8 , the underground transformer is basically the same as Example 1. Furthermore, in order to improve the sealing effect of the blocking airbag 401, the following scheme is further adopted. A cylinder 11 is fixedly connected to the inner wall of the propulsion cylinder 4, and a push rod 12 is slidably and sealedly connected inside the cylinder 11. The cylinder 11 is connected to the blocking airbag 401 through a first one-way air outlet pipe 14. A one-way air inlet pipe 15 is connected to the cylinder 11. When the clamping ring 8 and the guide ring 9 are pushed forward, the guide ring 9 pushes the push rod 12. A second spring 13 is provided between the inner wall of the cylinder 11 and the push rod 12. The second spring 13 facilitates the reset of the push rod 12.

[0023] Reference Figure 8 When the clamping ring 8 and the guide ring 9 are pushed back and forth, the push rod 12 will be driven to move back and forth, thereby filling the gas into the blocking airbag 401 through the first one-way air outlet pipe 14 with a one-way valve, so as to further improve the blocking effect.

[0024] Reference Figure 8 , in the specific implementation, in order to ensure that the clamping ring 8 can be quickly withdrawn and separated from the guide ring 9 first, the guide ring 9 and the butt joint 12 are connected with a first magnet, and the butt joint 12 and the guide ring 9 are connected with a second magnet attracted to the first magnet. The one-way air intake pipe 15 adopts a thin tube. The one-way air intake pipe 15 with a one-way valve uses a thinner air intake hole when the push rod 12 returns to its position. Since the air intake hole adopts a thinner air intake hole, the air intake speed is very slow when the push rod 12 returns to its position, which has a certain delay effect on the reset of the push rod 12. When the clamping ring 8 returns to its position quickly, the push rod 12 and the guide ring 9 are delayed for a certain time before returning to their positions to ensure that the clamping ring 8 is separated from the guide ring 9 first. The thrust of the first spring 10 is greater than the suction force of the first magnet and the second magnet. As time goes by, the guide ring 9 is separated from the push rod 12 and returns to its position under the action of the first spring 10.

[0025] Reference Figure 9 In addition, it should be noted that, during the actual propulsion process, the gas in the blocking airbag 401 will be quickly filled. This scheme uses the generated gas for additional storage. The inner wall of the propulsion cylinder 4 is fixedly connected with an air storage ring 17 and a sealing airbag 18. A first solenoid valve 19 is connected between the air storage ring 17 and the sealing airbag 18. A second one-way air outlet pipe 16 is connected between the air storage ring 17 and the cylinder body 11. After the blocking airbag 401 is full, the one-way valve of the first one-way air outlet pipe 14 is closed, and the one-way valve of the second one-way air outlet pipe 16 is opened to store airflow in the air storage ring 17. After the connecting line 101 is inserted and propulsion is completed, the first solenoid valve 19 can be opened to expand the sealing airbag 18, further sealing the space between the propulsion cylinder 4 and the connecting line 101, and further effectively preventing water seepage.

[0026] Reference Figure 7 、 Figure 8 and Figure 9 In some other embodiments, after the connecting line 101 is pushed into place, when the locking clamping ring 8 and the guide ring 9 are pushed by the electric telescopic rod 5, in order to further lock them, the following technical solution is adopted: a stabilizing ring 20 corresponding to the guide ring 9 is fixedly connected to the inner wall of the propulsion cylinder 4, and a plug post 23 is slidably connected in the stabilizing ring 20, and a socket 803 corresponding to the plug post 23 is provided on the clamping ring 8 and the guide ring 9; a sliding groove 21 is provided on the stabilizing ring 20, and the plug post 23 is slidably and sealedly connected in the sliding groove 21, and a reset spring 24 is connected between the plug post 23 and the sliding groove 21, and the upper end of the sliding groove 21 is connected to the air storage ring 17 through the connecting pipe 22, and the connecting pipe 22 is connected to the second solenoid valve, when the guide ring 9 is pushed to close the stabilizing ring 20, the plug post 23 corresponds to the socket 803, and the second solenoid valve is opened at this time, and the gas stored in the air storage ring 17 pushes the plug post 23 to move downward and insert into the socket 803, thereby effectively locking the clamping ring 8 and the guide ring 9.

[0027] Reference Figure 7In the specific implementation, the air storage ring 17 can be used to store excess gas to inflate the sealing airbag ring 801, thereby further improving the sealing effect. The scheme is as follows: a through hole 25 with a pressure relief valve is opened on the plug column 23, and the through hole 25 is connected to the upper end of the sliding groove 21. The sealing airbag ring 801 is connected to the socket 803 through the delivery pipe 804. When the plug column 23 is inserted into the socket 803, the through hole 25 is connected to the delivery pipe 804. In actual operation, the delivery pipe 804 can be provided with a one-way valve. After the plug column 23 is inserted into the socket 803, the pressure relief valve on the through hole 25 is opened, and the airflow enters the sealing airbag ring 801 through the through hole and the delivery pipe 804.

[0028] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An underground transformer, comprising a body (1), wherein a connecting wire (101) with an insulating layer is provided on the body (1), characterized in that: The body (1) is connected to a support ring (2) and a support block (3), the support block (3) is connected to a propulsion cylinder (4), and the support ring (2) is fixedly connected to an electric telescopic rod (5); A push rod (7) is slidably connected in the propulsion cylinder (4), a driving end of the electric telescopic rod (5) is connected to the push rod (7), a symmetrical clamping ring (8) is lifted and lowered on the push rod (7), a tension spring (701) is connected between the clamping ring (8) and the push rod (7), a guide ring (9) is slidably connected in the propulsion cylinder (4), the clamping ring (8) and the guide ring (9) are both provided with mutually matching inclined surfaces, a first spring (10) is connected between the guide ring (9) and the propulsion cylinder (4), and the elastic force of the first spring (10) is greater than the tension of the tension spring (701); The electric telescopic rod (5) pushes the push rod (7) to move, and the push rod (7) drives the clamping ring (8) to move close to the guide ring (9), and the symmetrical clamping ring (8) clamps the connecting line (101) and drives the connecting line (101) forward; One end of the propulsion cylinder (4) inserted into the ground wire hole is covered with a sealing airbag (401), and the inner sides of the symmetrical clamping rings (8) are each provided with a plurality of sealing airbag rings (801).

2. The underground transformer according to claim 1, characterized in that: A reset tension spring (6) is connected between the push rod (7) and the propulsion cylinder (4).

3. The underground transformer according to claim 1 or 2, characterized in that: The opposing sides of the symmetrical clamping rings (8) are each provided with a plurality of groups of staggeredly arranged sealing strips (802).

4. The underground transformer according to claim 1, characterized in that: A cylinder body (11) is fixedly connected to the inner wall of the propulsion cylinder (4), a push rod (12) is slidably and sealingly connected inside the cylinder body (11), the cylinder body (11) is connected to the blocking airbag (401) through a first one-way air outlet pipe (14), a one-way air inlet pipe (15) is connected to the cylinder body (11), and when the clamping ring (8) and the guide ring (9) are pushed forward, the guide ring (9) pushes the push rod (12).

5. The underground transformer according to claim 4, characterized in that: A second spring (13) is provided between the inner wall of the cylinder (11) and the push rod (12).

6. The underground transformer according to claim 4, characterized in that: A first magnet is connected to the contact portion between the guide ring (9) and the push rod (12), and a second magnet attracted to the first magnet is connected to the contact portion between the push rod (12) and the guide ring (9). The one-way air intake pipe (15) is a thin tube.

7. The underground transformer according to claim 4, characterized in that: An air storage ring (17) and a sealing air bag (18) are fixedly connected to the inner wall of the propulsion cylinder (4); a first solenoid valve (19) is connected between the air storage ring (17) and the sealing air bag (18); and a second one-way air outlet pipe (16) is connected between the air storage ring (17) and the cylinder body (11).

8. The underground transformer according to claim 7, characterized in that: A stabilizing ring (20) corresponding to the guide ring (9) is fixedly connected to the inner wall of the propulsion cylinder (4), a plug post (23) is slidably connected in the stabilizing ring (20), and a socket (803) corresponding to the plug post (23) is provided on the clamping ring (8) and the guide ring (9).

9. The underground transformer according to claim 8, characterized in that: A sliding groove (21) is provided on the stabilizing ring (20), and the plug (23) is slidingly and sealingly connected in the sliding groove (21). A return spring (24) is connected between the plug (23) and the sliding groove (21). The upper end of the sliding groove (21) is connected to the air storage ring (17) through a connecting pipe (22), and a second solenoid valve is connected to the connecting pipe (22).

10. The underground transformer according to claim 9, characterized in that: A through hole (25) with a pressure relief valve is provided on the plug post (23), and the through hole (25) is communicated with the upper end of the sliding groove (21). The sealing airbag ring (801) is communicated with the plug hole (803) through the delivery pipe (804). When the plug post (23) is inserted into the plug hole (803), the through hole (25) is communicated with the delivery pipe (804).

Images