Water conservancy project torrent chute

Abstract

The utility model discloses a hydraulic engineering torrent chute which comprises a torrent chute body, the torrent chute body comprises a flow inlet chute, an oblique flow chute fixedly communicated with the right side of the flow inlet chute and a water outlet tank fixedly communicated with the right side of the oblique flow chute, and water outlet pipes are fixedly communicated with the front side and the rear side of the water outlet tank. The right side of the top of the inflow groove and the left side of the top of the oblique flow groove are fixedly connected with the same cover plate, the top and the right side of the inflow groove are both provided with openings, and the left side of the inflow groove is fixedly communicated with a communicating pipe. Through the arrangement of a series of structures, impurities in water can be filtered and collected, the situation that follow-up blockage is caused due to the fact that the impurities enter the inclined flow groove can be effectively reduced, the water circulation stability is improved, the two rectangular filter screen frames can rotate up and down to be alternately filtered and cleaned, and the service life of the filter screen is prolonged. The effect of cleaning work is achieved while impurities are prevented from flowing to the follow-up direction, filtering and cleaning are conducted synchronously and do not interfere with each other, and the using effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rapid flow troughs, in particular to a rapid flow trough for water conservancy projects. Background Art

[0002] A rapid flow trough refers to a trough with a steep slope or deep ditch, where the water does not leave the bottom of the trough. The main purpose of a rapid flow trough is to reduce the potential energy of water flowing from top to bottom, and to reduce the scouring of the water conservancy project below. The rapid flow trough in the prior art mainly relies on multiple platforms at the bottom of the trough to slow down the water flow. This deceleration method will cause a large amount of water to splash out from the rapid flow trough to the outside of the rapid flow trough, resulting in a waste of water resources. Moreover, under the long-term scouring of water flow, the soil outside the rapid flow trough is washed loose, causing damage to the rapid flow trough. This application number: 202120003117.0 discloses a rapid flow trough for a water conservancy project, comprising a horizontally arranged inlet trough, an oblique flow trough is arranged on the right side of the inlet trough, and a water outlet box is arranged at the end of the oblique flow trough away from the inlet trough; the upper end of the water outlet box is open, and an arc-shaped backflow cover is arranged at the right position of the top of the water outlet box; water outlet holes are arranged at the front and rear sides of the water outlet box, a water outlet pipe is flange-connected at the water outlet hole, and a water inlet pipe is flange-connected at the left position of the inlet trough; the device can achieve water flow deceleration;

[0003] The water conservancy engineering rapids trough disclosed in the above patent adopts a water outlet box to absorb energy at the end, so that the water flow flushing downward from the oblique flow trough is decelerated at the water outlet box, and the lateral water outlet method can prevent the water flowing down from the oblique flow trough from being directly discharged downward, further achieving the technical effect of deceleration. Compared with the traditional technical scheme, it can reduce the external dispersion of water resources, but it still has some shortcomings during use: since there will be a large amount of impurities in the flood discharge flow, the rapids trough disclosed in the above patent lacks a structure for filtering impurities. If the impurities are not cleaned in time, it is easy to cause blockage in the subsequent flow process, thereby affecting the stable circulation of the rapids trough. Although there is a structure for filtering through a simple filter net in the prior art, when cleaning impurities during the filtration process, the filter net needs to be removed for cleaning. When the filter net is removed, the impurities in the water that continues to flow will flow to the subsequent flow in large quantities due to no obstruction, and the cleaning work cannot be performed while preventing the impurities from flowing to the subsequent flow, which affects the use effect and cannot meet the use requirements. Based on the above situation, we propose a water conservancy engineering rapids trough. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a rapid flow trough for water conservancy projects.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A rapid flow trough for a water conservancy project comprises a rapid flow trough body, wherein the rapid flow trough body comprises an inlet trough, an oblique flow trough connected and fixed on the right side of the inlet trough, and a water outlet box connected and fixed on the right side of the oblique flow trough, the front and rear sides of the water outlet box are connected and fixed with an outlet pipe, the top right side of the inlet trough and the top left side of the oblique flow trough are fixedly connected with the same cover plate, the principle of slowing down flood discharge by cooperating with the inlet trough, the oblique flow trough, the water outlet box, the outlet pipe and the cover plate has been mentioned in the patent application number 202120003117.0, and will not be elaborated here in detail, the top and right side of the inlet trough are both set as openings, the left side of the inlet trough is connected and fixed with a connecting pipe, the bottom inner wall, the front inner wall and the rear inner wall of the inlet trough are fixedly connected with the same mounting block, and the left side of the mounting block is provided with a top A circular groove is set as an opening, and a rotating block is provided in the sealing movable sleeve of the circular groove. Two rectangular grooves are provided on the left side of the rotating block. The sides of the two rectangular grooves that are far away from each other are set as openings. The inner walls of the two rectangular grooves that are close to each other are magnetically carded with filtering mechanisms. The filtering mechanisms are used to filter impurities in the water. A one-way valve with the right side as the outlet is embedded on the right inner wall of the rectangular groove. A drainage hole is provided on the right inner wall of the circular groove. A rotating drive mechanism is fixedly connected to the right side of the rotating block. The rotating drive mechanism is used to drive the rotating block to rotate, so as to rotate the two filtering mechanisms alternately. The rotating drive mechanism is fixedly connected to the mounting block. A control reminder mechanism is fixedly connected to the top left side of the inlet groove. The control reminder mechanism is electrically connected to the rotating drive mechanism. The control reminder mechanism is used to alarm and remind personnel.

[0007] Preferably, the filtering mechanism includes a rectangular filter frame movably mounted in the rectangular groove, the left side of the rectangular filter frame is set as an opening, the connecting pipe is aligned and connected with the rectangular filter frame located below, the rectangular filter frame is used to filter impurities in the water, the two rectangular filter frames are magnetically fixed on the inner walls of the two rectangular grooves on the side close to each other, the two rectangular filter frames are provided with a first through hole with an opening on the left side on the inner walls on the side away from each other, the two rectangular filter frames are fixedly connected to the inner walls of the side close to each other, the two pull rods are fixedly connected to the pull rings on the ends of the two pull rods away from each other, the pull rings extend into the first through hole on the end away from the corresponding pull rods, and the corresponding rectangular filter frames can be moved out for cleaning by the pull rings and the pull rods.

[0008] Preferably, the rotary drive mechanism includes a brake motor, which is fixedly connected to the right side of the mounting block, and the right side of the mounting block is fixedly connected to a waterproof box with an opening on the left side, the brake motor is located in the waterproof box, and a connecting shaft is fixedly connected to the right center position of the rotating block, and the connecting shaft is rotatably installed on the right inner wall of the circular groove, and the left end of the output shaft of the brake motor is fixedly connected to the right end of the connecting shaft, and the brake motor and the rotating shaft cooperate to drive the rotating block to rotate, and a sealing ring is bonded and fixed on the right inner wall of the circular groove, and the sealing ring is sleeved on the connecting shaft, and the left side of the sealing ring is in active contact with the right side of the rotating block, and the rotating block and the circular groove are sealed by the sealing ring, and two infrared signal transmitters are embedded and fixed on the right side of the rotating block, and an infrared signal receiver is embedded and fixed on the top left side of the sealing ring, and the infrared signal receiver is aligned with the infrared signal transmitter located above, and the infrared signal transmitter and the infrared signal receiver cooperate to judge the rotation position of the two rectangular filter frames.

[0009] Preferably, the control reminder mechanism includes a controller fixedly connected to the top left side of the inlet trough, and a sound and light alarm is fixedly connected to the left side of the controller. The controller is electrically connected to the sound and light alarm, an infrared signal receiver and a brake motor. The sound and light alarm is used to remind personnel with sound and light alarms. The controller receives the signal transmitted by the infrared signal receiver to control the sound and light alarm and the brake motor. The control principle is the existing technology and will not be elaborated here.

[0010] Preferably, a groove is provided on the inner wall of the two rectangular grooves on the side close to each other, and a first magnet is fixedly connected to the inner wall of the groove on the side away from the opening thereof, and a second magnet is fixedly connected to the side of the two rectangular filter frames on the side close to each other, and the second magnet is movably mounted in the corresponding groove and adsorbed with the first magnet, and the rectangular filter frame can be quickly fixed by the first magnet and the second magnet.

[0011] Preferably, a sealing sleeve is provided on the outer side of the rotating block, and the outer side of the sealing sleeve is in movable contact with the inner wall of the circular groove, so that a sealed connection between the rotating block and the circular groove is achieved through the sealing sleeve. Two rectangular through holes are provided on the outer side of the sealing sleeve, which are respectively connected to the corresponding rectangular grooves, and the rectangular through holes are used for allowing the rectangular filter frame to be moved out.

[0012] Preferably, the front side and the rear side of the sealing ring are in active contact with the front inner wall and the rear inner wall of the circular groove respectively.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] 1. The combination of the rectangular filter frame, the one-way valve and the drain hole can filter and collect impurities in the circulating water, effectively reducing the amount of impurities that enter the inclined flow channel and cause subsequent blockage, thereby improving the stability of water flow;

[0015] 2. Through the cooperation of the filtering mechanism, the rotating driving mechanism and the control reminder mechanism, the two rectangular filter frames can be filtered and cleaned alternately after filtering for a period of time;

[0016] The utility model can filter and collect impurities in water through the arrangement of a series of structures, which can effectively reduce the situation that impurities enter the inclined flow channel and cause subsequent blockage, improve the stability of water flow, and can rotate the two rectangular filter frames up and down to filter and clean alternately, so as to achieve the effect of cleaning while preventing impurities from flowing subsequently, so that filtering and cleaning are carried out simultaneously without interfering with each other, thereby improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a rapid flow trough for a water conservancy project proposed by the utility model;

[0018] Figure 2 for Figure 1 The enlarged cross-sectional structure diagram of the middle part A;

[0019] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part B.

[0020] In the figure: 100, inlet trough; 101, oblique flow trough; 102, cover plate; 103, water outlet box; 104, water outlet pipe; 105, connecting pipe; 1, mounting block; 2, rotating block; 3, rectangular groove; 4, rectangular filter frame; 5, pull rod; 6, first through hole; 7, controller; 8, sound and light alarm; 9, one-way valve; 10, brake motor; 11, waterproof box; 12, drainage hole; 13, sealing ring; 14, infrared signal transmitter; 15, infrared signal receiver; 16, connecting shaft. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely 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 of the embodiments.

[0022] Reference Figure 1-3A water conservancy project rapid flow trough includes a rapid flow trough body, the rapid flow trough body includes an inlet trough 100, an oblique flow trough 101 connected and fixed on the right side of the inlet trough 100, and an outlet box 103 connected and fixed on the right side of the oblique flow trough 101, the front and rear sides of the outlet box 103 are connected and fixed with an outlet pipe 104, the top right side of the inlet trough 100 and the top left side of the oblique flow trough 101 are fixedly connected with the same cover plate 102, and the principle of decelerating flood discharge by cooperating with the inlet trough 100, the oblique flow trough 101, the outlet box 103, the outlet pipe 104 and the cover plate 102 is described in the application number 202120 It has been mentioned in the patent of 003117.0, and will not be elaborated here in detail. The top and right side of the inlet flow groove 100 are both set as openings, and the left side of the inlet flow groove 100 is connected and fixed with a connecting pipe 105. The bottom inner wall, the front inner wall and the rear inner wall of the inlet flow groove 100 are fixedly connected with the same mounting block 1. The left side of the mounting block 1 is provided with a circular groove with an opening at the top, and a rotating block 2 is provided in a sealing movable sleeve in the circular groove, wherein the outer side of the rotating block 2 is sleeved with a sealing sleeve, and the outer side of the sealing sleeve is in movable contact with the inner wall of the circular groove, and the sealing connection between the rotating block 2 and the circular groove is realized through the sealing sleeve;

[0023] Two rectangular grooves 3 are provided on the left side of the rotating block 2, and the sides of the two rectangular grooves 3 that are away from each other are set as openings, and the inner walls of the two rectangular grooves 3 that are close to each other are magnetically carded with filtering mechanisms, and the filtering mechanism includes a rectangular filter frame 4 that is movably sleeved in the rectangular groove 3, and the outer side of the sealing sleeve is provided with two rectangular through holes that are respectively connected to the corresponding rectangular grooves 3, and the rectangular through holes are used for the rectangular filter frames 4 to move out, and the left side of the rectangular filter frame 4 is set as an opening, and the connecting pipe 105 is aligned and connected with the rectangular filter frame 4 located below, and the rectangular filter frame 4 is used to filter impurities in the water, and the two rectangular filter frames 4 are magnetically carded and fixed on the inner walls of the two rectangular grooves 3 that are close to each other, and the outer sides of the rectangular filter frames 4 are in movably contact with the corresponding inner walls of the rectangular grooves 3, wherein the two rectangular A groove is provided on the inner wall of the side where the grooves 3 are close to each other, and a first magnet is fixedly connected to the inner wall on the side where the grooves are away from the openings thereof, and a second magnet is fixedly connected to the sides where the two rectangular filter frames 4 are close to each other, and the second magnet is movably sleeved in the corresponding groove and adsorbed with the first magnet, and the rectangular filter frames 4 can be quickly fixed by the first magnet and the second magnet, and a first through hole 6 with an opening on the left side is provided on the inner wall on the side where the two rectangular filter frames 4 are away from each other, and a pull rod 5 is fixedly connected to the inner wall on the side where the two rectangular filter frames 4 are close to each other, and a pull ring is fixedly connected to the ends of the two pull rods 5 away from each other, and the end of the pull ring away from the corresponding pull rod 5 extends into the first through hole 6, and the corresponding rectangular filter frame 4 can be removed for cleaning by the pull ring and the pull rod 5;

[0024] A one-way valve 9 with the right side as the outlet is embedded on the right inner wall of the rectangular groove 3, and the one-way valve 9 is connected to the corresponding rectangular filter frame 4. A drainage hole 12 is opened on the right inner wall of the circular groove. A rotary drive mechanism is fixedly connected to the right side of the rotating block 2, and the rotary drive mechanism is fixedly connected to the mounting block 1. The rotary drive mechanism includes a brake motor 10, and the brake motor 10 is fixedly connected to the right side of the mounting block 1. A waterproof box 11 with an opening on the left side is fixedly connected to the right side of the mounting block 1. The brake motor 10 is located in the waterproof box 11, and the waterproof box 11 is used to shield and protect the brake motor 10. A connecting shaft 16 is fixedly connected to the right center position of the rotating block 2, and the connecting shaft 16 is rotatably installed on the right inner wall of the circular groove. The left end of the output shaft of the brake motor 10 is fixedly connected to the right end of the connecting shaft 16. The brake motor 10 cooperates with the connecting shaft 16 to drive the rotating block 2 to rotate. A sealing ring 13 is bonded and fixed on the right inner wall of the circular groove. The sealing ring 13 is sleeved on the connecting shaft 16. The front and rear sides of the sealing ring 13 are in active contact with the front inner wall and the rear inner wall of the circular groove respectively. The left side of the sealing ring 13 is in active contact with the right side of the rotating block 2. The sealing ring 13 is used to realize the sealed connection between the rotating block 2 and the circular groove. Two infrared signal transmitters 14 are embedded and fixed on the right side of the rotating block 2. An infrared signal receiver 15 is embedded and fixed on the top left side of the sealing ring 13. The infrared signal receiver 15 is aligned with the infrared signal transmitter 14 located above. The infrared signal transmitter 14 and the infrared signal receiver 15 cooperate to judge the rotation position of the two rectangular filter frames 4.

[0025] A control reminder mechanism is fixedly connected to the top left side of the inlet chute 100, and the control reminder mechanism includes a controller 7 fixedly connected to the top left side of the inlet chute 100. A sound and light alarm 8 is fixedly connected to the left side of the controller 7. The controller 7 is electrically connected to the sound and light alarm 8, an infrared signal receiver 15 and a brake motor 10. The sound and light alarm 8 is used to sound and light alarm to remind personnel. The controller 7 receives the signal transmitted by the infrared signal receiver 15 to control the sound and light alarm 8 and the brake motor 10. The control principle is the prior art and is not elaborated here in detail. The utility model can filter and collect impurities in water through the setting of a series of structures, and can effectively reduce the situation where impurities enter the inclined flow chute 101 and cause subsequent blockage, thereby improving the stability of water flow, and can rotate the two rectangular filter frames 4 up and down to alternately filter and clean, so as to achieve the effect of cleaning while preventing impurities from flowing to the subsequent flow, so that filtering and cleaning are carried out simultaneously without interfering with each other, thereby improving the use effect.

[0026] Working principle: When in use, the connecting pipe 105 is connected to the external water pipe, and water enters the rectangular filter frame 4 below through the connecting pipe 105 in turn, and passes through the rectangular filter frame 4 below, and is discharged into the oblique flow groove 101 through the one-way valve 9 and the drainage hole 12 below. The water inside the oblique flow groove 101 is discharged to the outside through the water outlet box 103 and the water outlet pipe 104. The principle of slowing down flood discharge through the cooperation of the inlet groove 100, the oblique flow groove 101, the water outlet box 103 and the water outlet pipe 104 has been mentioned in the patent application number 202120003117.0, and will not be elaborated here;

[0027] At the same time, the rectangular filter frame 4 below filters and blocks impurities in the water, which can effectively reduce the impurities from entering the inclined flow channel 101 and causing subsequent blockage, thereby improving the stability of water flow. The interval time for opening the brake motor 10 is set in advance through the controller 7. When the opening time is reached, the controller 7 controls the brake motor 10 to open in the forward direction, and the output shaft of the brake motor 10 drives the rotating block 2 to rotate through the connecting shaft 16. The rotating block 2 drives the two rectangular filter frames 4 and the two infrared signal transmitters 14 to rotate. When the upper rectangular filter frame 4 rotates to the bottom and the lower rectangular filter frame 4 rotates to the top, the lower infrared signal transmitter 14 rotates to the top and aligns with the infrared signal receiver 15. The infrared signal receiver 15 After receiving the signal, the signal is transmitted to the controller 7, and the controller 7 controls the brake motor 10 to be closed. At the same time, the controller 7 controls the sound and light alarm 8 to send out a sound and light alarm to remind the personnel. After hearing the alarm, the personnel turn off the sound and light alarm 8 and can pull the upper pull ring upwards. The upper pull ring drives the upper rectangular filter frame 4 to move upwards through the corresponding pull rod 5. The upper rectangular filter frame 4 drives the corresponding second magnet to separate from the first magnet, and the rectangular filter frame 4 can be removed and aligned with the impurities inside for cleaning. After cleaning, the rectangular filter frame 4 is moved again into the corresponding rectangular groove 3 and fixed again by the first magnet and the second magnet. During the cleaning process, it is rotated to the rectangular filter frame 4 below to continue the filtering operation without affecting the continued circulation of water.

[0028] When the next cleaning time is reached, the controller 7 controls the brake motor 10 to turn on again. When the rectangular filter frame 4 located at the top rotates to the bottom and the rectangular filter frame 4 located at the bottom rotates to the top, the sound and light alarm 8 can be controlled again to alarm and remind personnel, and the personnel can clean the rectangular filter frame 4 located at the top again. By alternating filtering and cleaning, the effect of cleaning can be achieved while preventing impurities from flowing to the subsequent flow, so that filtering and cleaning are carried out simultaneously without interfering with each other, thereby improving the use effect.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rapid flow trough for a water conservancy project, comprising a rapid flow trough body, wherein the rapid flow trough body comprises an inlet trough (100), an oblique flow trough (101) connected and fixed to the right side of the inlet trough (100), and an outlet box (103) connected and fixed to the right side of the oblique flow trough (101), the front side and the rear side of the outlet box (103) are both connected and fixed with an outlet pipe (104), the top right side of the inlet trough (100) and the top left side of the oblique flow trough (101) are fixedly connected with the same cover plate (102), characterized in that: The top and right side of the inlet groove (100) are both set as openings. A connecting pipe (105) is connected and fixed on the left side of the inlet groove (100). The bottom inner wall, the front inner wall and the rear inner wall of the inlet groove (100) are fixedly connected with the same mounting block (1). A circular groove with an opening at the top is opened on the left side of the mounting block (1). A rotating block (2) is provided in a sealing sleeve in the circular groove. Two rectangular grooves (3) are opened on the left side of the rotating block (2). The two rectangular grooves (3) are both set as openings on the sides away from each other. A filtering mechanism is magnetically attached to the inner wall of the two rectangular grooves (3) on the sides close to each other. A one-way valve (9) with the right side as an outlet is embedded on the right inner wall of the rectangular groove (3). A drainage hole (12) is opened on the right inner wall of the circular groove. A rotating drive mechanism is fixedly connected to the right side of the rotating block (2). The rotating drive mechanism is fixedly connected to the mounting block (1). A control reminder mechanism is fixedly connected to the top of the left side of the inlet groove (100). The control reminder mechanism is electrically connected to the rotating drive mechanism.

2. A water conservancy engineering rapids trough according to claim 1, characterized in that: The filtering mechanism comprises a rectangular filter frame (4) movably sleeved in the rectangular groove (3), the left side of the rectangular filter frame (4) is set as an opening, the connecting pipe (105) is aligned and connected with the rectangular filter frame (4) located below, the two rectangular filter frames (4) are respectively magnetically fixed on the inner walls of the two rectangular grooves (3) on the side close to each other, the inner walls of the two rectangular filter frames (4) on the side away from each other are each provided with a first through hole (6) with the left side being an opening, the inner walls of the two rectangular filter frames (4) on the side close to each other are each fixedly connected with a pull rod (5), the ends of the two pull rods (5) away from each other are each fixedly connected with a pull ring, and the end of the pull ring away from the corresponding pull rod (5) extends into the first through hole (6).

3. A water conservancy engineering rapids trough according to claim 2, characterized in that: The rotary drive mechanism comprises a brake motor (10), the brake motor (10) is fixedly connected to the right side of the mounting block (1), the right side of the mounting block (1) is fixedly connected to a waterproof box (11) with an opening on the left side, the brake motor (10) is located in the waterproof box (11), the right center position of the rotating block (2) is fixedly connected to a connecting shaft (16), the connecting shaft (16) is rotatably mounted on the right inner wall of the circular groove, the left end of the output shaft of the brake motor (10) is fixedly connected to the right end of the connecting shaft (16), a sealing ring (13) is adhesively fixed on the right inner wall of the circular groove, the sealing ring (13) is sleeved on the connecting shaft (16), the left side of the sealing ring (13) is in active contact with the right side of the rotating block (2), two infrared signal transmitters (14) are embedded and fixed on the right side of the rotating block (2), an infrared signal receiver (15) is embedded and fixed on the left top of the sealing ring (13), and the infrared signal receiver (15) is aligned with the infrared signal transmitter (14) located above.

4. A water conservancy engineering rapids trough according to claim 3, characterized in that: The control reminder mechanism comprises a controller (7) fixedly connected to the top of the left side of the inlet trough (100), a sound and light alarm (8) fixedly connected to the left side of the controller (7), and the controller (7) is electrically connected to the sound and light alarm (8), an infrared signal receiver (15) and a brake motor (10).

5. A rapid flow trough for water conservancy projects according to claim 2, characterized in that: A groove is provided on the inner wall of the two rectangular grooves (3) on the side close to each other, and a first magnet is fixedly connected to the inner wall of the groove away from the opening thereof. A second magnet is fixedly connected to the inner wall of the two rectangular filter frames (4) on the side close to each other, and the second magnet is movably sleeved in the corresponding groove and adsorbed to the first magnet.

6. A rapid flow trough for water conservancy projects according to claim 1, characterized in that: The outer side of the rotating block (2) is provided with a sealing sleeve, the outer side of the sealing sleeve is in active contact with the inner wall of the circular groove, and the outer side of the sealing sleeve is provided with two rectangular through holes respectively connected with the corresponding rectangular grooves (3).

7. A rapid flow trough for water conservancy projects according to claim 3, characterized in that: The front side and the rear side of the sealing ring (13) are in active contact with the front inner wall and the rear inner wall of the circular groove respectively.

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