Water tank water outlet for submersible capable of avoiding backflow

Abstract

The invention provides a water tank drainage port for a submersible capable of avoiding backflow, and relates to the technical field of submersible. A water drainage hole is formed in the tank wall of the submersible water tank, the water drainage nozzle penetrates through the water drainage hole formed in the submersible water tank, and the edge of the inner end of the water drainage nozzle is bent outwards. A fastening coil is connected to the outer part of the drainage nozzle and is positioned outside the submersible water tank; the outer end of the drainage nozzle is sleeved with a stress supporting ring, and two bolts are connected into the stress supporting ring. When water stored in the submersible water tank stops flowing outwards, the movable push rod is reset under the thrust influence of the small spring, the rubber sealing plug makes contact with the outward side of the pore plate, the interior of the drainage nozzle is sealed through the rubber sealing plug, and the backflow condition is effectively avoided. The problems that the water outlet of the water tank for the submersible is poor in one-way sealing effect, and when the submersible dives to a deep water area, external water flows back into the water tank through the water outlet due to the fact that the submersible is prone to being affected by water pressure increase are solved.

Description

Technical Field

[0001] The invention relates to the technical field of submersibles, in particular to a water tank drain outlet for submersibles to avoid backflow. Background Art

[0002] The submersible is an active deep-diving device with underwater observation and operation capabilities. It is mainly used to perform underwater surveys, seabed exploration, seabed development and salvage, life-saving and other tasks, and can be used as an underwater operation base for divers. The water tank, as one of the core components of the submersible, plays the role of controlling the submersible to dive by water intake and controlling the submersible to float by water discharge. Therefore, the water tank of the submersible needs to be equipped with a water inlet and a water outlet. Although the existing water tank outlet can realize the water tank to drain outward, it still has the following disadvantages;

[0003] First, the drain port and the water tank are generally designed as an integrated unit. When the drain port is damaged, it cannot be quickly replaced. The damaged drain port needs to be cut off with tools, and then a new drain port needs to be welded, which takes a long time.

[0004] Second, the one-way sealing effect of the drain port itself is not good. When the submersible dives to deeper waters, it is easily affected by the increase in water pressure, causing external water to flow back into the water tank through the drain port, affecting the application effect of the submersible. Utility Model Content

[0005] The present invention relates to a water tank drain outlet for use in a submersible to avoid backflow, and solves the problem that in actual use of the existing water tank drain outlet, the drain outlet and the water tank are generally designed as an integrated whole, and when the drain outlet is damaged, it cannot be quickly replaced, and the damaged drain outlet needs to be cut off by tools, and then a new drain outlet is welded, which is a time-consuming process, and the one-way sealing effect of the drain outlet itself is not good. When the submersible dives to deeper waters, it is easily affected by the increase in water pressure, causing external water to flow back into the water tank through the drain outlet, affecting the application effect of the submersible.

[0006] According to a first aspect of the present disclosure, a drain outlet of a submersible water tank for avoiding backflow is provided, specifically comprising: a submersible water tank; a drain hole is provided on the wall of the submersible water tank, a drain nozzle penetrates through the drain hole provided in the submersible water tank, and the inner end edge of the drain nozzle is bent outward; a fastening screw ring is connected to the outside of the drain nozzle, and the fastening screw ring is located outside the submersible water tank; a force-bearing support ring is sleeved on the outer end of the drain nozzle, and two bolts are connected inside the force-bearing support ring, and the bolts are connected to the drain nozzle; a movable locking ring is sleeved on the outside of the drain nozzle, and the movable locking ring is in contact with the fastening screw ring; a movable push rod is installed inside the drain nozzle.

[0007] Furthermore, a rubber sealing ring is sleeved on the outside of the drainage nozzle, one side of the rubber sealing ring is in contact with the drainage nozzle, and the other side of the rubber sealing ring is in contact with the inner side of the submersible water tank.

[0008] Furthermore, a positioning groove is circumferentially provided on the edge of the drainage hole, and a guide ridge is circumferentially provided on the outer side of the drainage nozzle. The guide ridge is connected to the positioning groove, and the guide ridge cooperates with the positioning groove to limit the drainage nozzle and prevent it from rotating.

[0009] Furthermore, an external thread is provided on the guide ridge, an internal thread is provided inside the fastening screw, the fastening screw is threadedly connected to the drain nozzle, the fastening screw is in contact with the outside of the submersible water tank, and the fastening screw is rotated to drive the drain nozzle to move outward, exerting pressure on the rubber sealing ring, so that the rubber sealing ring is in close contact with the submersible water tank and the drain nozzle.

[0010] Furthermore, two threaded holes are provided on the outside of the drain nozzle, and two connecting holes are provided on the inside of the force support ring. The connecting holes are connected to the threaded holes provided on the drain nozzle, and the bolts are connected to the connecting holes provided on the force support ring, and the ends of the bolts are threadedly connected to the threaded holes.

[0011] Furthermore, the movable locking ring is slidably connected to the drain nozzle, and a guide groove is circumferentially arranged on the inner side of the movable locking ring. The guide groove is slidably connected to a guide ridge provided on the drain nozzle. The sliding cooperation between the guide groove and the guide ridge has a guiding effect on the movement of the movable locking ring, thereby preventing the movable locking ring from rotating.

[0012] Furthermore, a movable ratchet is arranged in a circumferential shape on the outside of the tightening spiral ring, and a fixed ratchet is arranged in a circumferential shape on the outside of the movable locking ring, and the fixed ratchet is meshed with the movable ratchet arranged on the tightening spiral ring.

[0013] Furthermore, a large spring is mounted on the outside of the drain nozzle, one end of the large spring is in contact with the force-bearing support ring, and the other end of the large spring is in contact with the movable locking ring. The large spring has an elastic reset effect on the movable locking ring, so that the movable ratchet and the fixed ratchet are tightly engaged with each other. After the fastening screw ring is rotated and tightened, the movable ratchet and the fixed ratchet are in an engaged state, and the fastening screw ring is unidirectionally locked and fixed through the movable locking ring, thereby preventing the fastening screw ring from rotating in the opposite direction and avoiding the occurrence of loosening of the fastening screw ring.

[0014] Furthermore, a guide frame is provided inside the drainage nozzle, a guide hole is provided at the center of the guide frame, a movable push rod slides through the guide hole, a hole plate is provided inside the drainage nozzle, the movable push rod passes through the hole plate, a rubber sealing plug is installed at the end of the movable push rod, and the rubber sealing plug is in contact with the outward side of the hole plate.

[0015] Furthermore, a small spring is mounted on the outside of the movable push rod, one end of the small spring is in contact with the guide frame, and the other end of the small spring is in contact with the guide frame. The small spring has an elastic resetting effect on the movable push rod, so that the rubber sealing plug is in close contact with the outward side of the orifice plate. When water stored in the water tank of the submersible flows outward, the water flow pushes the rubber sealing plug open, and the small spring is in a contracted state. When the water stored in the water tank of the submersible stops flowing outward, the movable push rod is reset under the influence of the thrust of the small spring, so that the rubber sealing plug is in contact with the outward side of the orifice plate, and the inside of the drain nozzle is sealed by the rubber sealing plug to avoid backflow.

[0016] The present invention provides a water tank drain outlet for a submersible device to avoid backflow, which has the following beneficial effects:

[0017] When the present invention is in use, the guide convex strip cooperates with the positioning groove to limit the drain nozzle and prevent the drain nozzle from rotating; the fastening screw ring is rotated to drive the drain nozzle to move outward, exerting pressure on the rubber sealing ring, so that the rubber sealing ring is in close contact with the submersible water tank and the drain nozzle, thereby ensuring the sealing and leak-proof effect of the connection between the drain nozzle and the submersible water tank.

[0018] In addition, through the sliding cooperation between the guide groove and the guide convex strip, the movable locking ring is guided to move and prevented from rotating; the large spring is used to elastically reset the movable locking ring, so that the movable ratchet and the fixed ratchet are tightly meshed with each other. After the fastening screw ring is rotated and tightened, the movable ratchet and the fixed ratchet are in a meshing state, and the movable locking ring is used to unidirectionally lock and fix the fastening screw ring, preventing the fastening screw ring from rotating in the opposite direction, avoiding the occurrence of loosening of the fastening screw ring, and further ensuring the sealing and leak-proof effect of the connection between the drain nozzle and the submersible water tank; when the drain nozzle needs to be replaced, the bolt is turned to first remove the force-bearing support ring from the outside of the drain nozzle, and then the large spring and the movable locking ring are removed from the outside of the drain nozzle, and finally the fastening screw ring is rotated in the opposite direction to remove the fastening screw ring from the outside of the drain nozzle, and the drain nozzle can be taken out of the submersible water tank for replacement, making the replacement of the drain nozzle easier and faster.

[0019] In addition, the small spring plays an elastic reset effect on the movable push rod, so that the rubber sealing plug is in close contact with the outward side of the orifice plate. When the water stored in the submersible water tank flows outward, the water flow pushes the rubber sealing plug open and the small spring is in a contracted state. When the water stored in the submersible water tank stops flowing outward, the movable push rod is reset under the influence of the thrust of the small spring, so that the rubber sealing plug is in contact with the outward side of the orifice plate, and the inside of the drain nozzle is sealed by the rubber sealing plug, effectively avoiding the occurrence of backflow.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0022] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0023] In the attached picture:

[0024] Figure 1 A schematic diagram of the outer shaft side structure of the water tank drain port of the submersible of the present application is shown;

[0025] Figure 2 It shows a schematic diagram of the inner shaft side structure of the water tank drain port of the submersible of the present application;

[0026] Figure 3 A schematic diagram showing the disassembled structure of the submersible water tank, the drainage nozzle and the fastening screw ring of the submersible water tank drainage outlet of the present application is shown;

[0027] Figure 4 A schematic diagram of the axial structure of the drainage nozzle of the water tank drainage outlet of the submersible of the present application is shown;

[0028] Figure 5 A schematic diagram of the connection structure of the movable push rod inside the drain nozzle of the water tank drain outlet of the submersible of the present application is shown;

[0029] Figure 6 A schematic diagram of the internal cross-sectional structure of a drainage nozzle of a water tank drainage outlet of a submersible according to the present application is shown;

[0030] Figure 7 It shows a schematic diagram of the axial side structure of the fastening screw ring of the water tank drain port of the submersible of the present application;

[0031] Figure 8 A schematic diagram of the axial structure of the force support ring of the water tank drain outlet of the submersible of the present application is shown;

[0032] Fig. 9 A schematic diagram of the axial structure of a movable locking ring of a water tank drain port of a submersible of the present application is shown.

[0033] Reference numerals list

[0034] 1. Submersible water tank; 101. Drain hole; 1011. Positioning groove; 2. Drain nozzle; 201. Guide ridge; 202. Threaded hole; 203. Guide frame; 2031. Guide hole; 204. Orifice plate; 3. Rubber sealing ring; 4. Fastening screw ring; 401. Moving ratchet; 5. Force support ring; 501. Connecting hole; 6. Bolt; 7. Movable locking ring; 701. Guide groove; 702. Fixed ratchet; 8. Large spring; 9. Movable push rod; 901. Rubber sealing plug; 10. Small spring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figures 1 to 9 :

[0037] The present invention proposes a water tank drain outlet for a submersible to avoid backflow, comprising: a submersible water tank 1; a drain hole 101 is provided on the wall of the submersible water tank 1, a drain nozzle 2 penetrates through the drain hole 101 provided on the submersible water tank 1, and the inner end edge of the drain nozzle 2 is bent outward; a fastening screw ring 4 is connected to the outside of the drain nozzle 2, and the fastening screw ring 4 is located outside the submersible water tank 1; a force-bearing support ring 5 is sleeved on the outer end of the drain nozzle 2, and two bolts 6 are connected inside the force-bearing support ring 5, and the bolts 6 are connected to the drain nozzle 2; a movable locking ring 7 is sleeved on the outside of the drain nozzle 2, and the movable locking ring 7 is in contact with the fastening screw ring 4; a movable push rod 9 is installed inside the drain nozzle 2; a rubber sealing ring 3 is sleeved on the outside of the drain nozzle 2, one side of the rubber sealing ring 3 is in contact with the drain nozzle 2, and the other side of the rubber sealing ring 3 is in contact with the submersible water tank 1 The inner side is in contact with each other; a positioning groove 1011 is arranged in a circumferential shape on the edge of the drainage hole 101, and a guide ridge 201 is arranged in a circumferential shape on the outer side of the drainage nozzle 2, and the guide ridge 201 is connected to the positioning groove 1011, and the guide ridge 201 cooperates with the positioning groove 1011 to limit the drainage nozzle 2 and prevent the drainage nozzle 2 from rotating; an external thread is arranged on the guide ridge 201, and an internal thread is arranged inside the fastening screw ring 4, the fastening screw ring 4 is threadedly connected with the drainage nozzle 2, the fastening screw ring 4 is in contact with the outer side of the submersible water tank 1, and the fastening screw ring 4 is rotated to drive the drainage nozzle 2 to move outward, and exert pressure on the rubber sealing ring 3, so that the rubber sealing ring 3 is in close contact with the submersible water tank 1 and the drainage nozzle 2, thereby ensuring the sealing and leak-proof effect of the connection part between the drainage nozzle 2 and the submersible water tank 1.

[0038] In the disclosed embodiment, two threaded holes 202 are provided on the outside of the drain nozzle 2, and two connecting holes 501 are provided on the inside of the force support ring 5. The connecting holes 501 are communicated with the threaded holes 202 provided on the drain nozzle 2, and the bolts 6 are connected to the connecting holes 501 provided on the force support ring 5. The ends of the bolts 6 are threadedly connected to the threaded holes 202. The movable locking ring 7 is slidably connected to the drain nozzle 2, and a guide groove 701 is circumferentially provided on the inner side of the movable locking ring 7. The guide groove 701 is slidably connected to the guide ridge 201 provided on the drain nozzle 2. By adopting the above technical scheme, the guide groove 701 and the guide ridge 201 are slidably matched, so as to guide the movement of the movable locking ring 7 and prevent the movable locking ring 7 from rotating.

[0039] In the disclosed embodiment, a movable ratchet 401 is arranged in a ring shape on the outside of the fastening spiral ring 4, and a fixed ratchet 702 is arranged in a ring shape on the outside of the movable locking ring 7. The fixed ratchet 702 is meshed with the movable ratchet 401 provided on the fastening spiral ring 4. A large spring 8 is mounted on the outside of the drain nozzle 2, and one end of the large spring 8 is in contact with the force-bearing support ring 5, and the other end of the large spring 8 is in contact with the movable locking ring 7. By adopting the above technical solution, the large spring 8 plays an elastic reset effect on the movable locking ring 7, so that the movable ratchet 401 and the fixed ratchet 702 are tightly meshed with each other. After the fastening spiral ring 4 is rotated and tightened, the movable ratchet 401 and the fixed ratchet 702 are in a meshing state. The movable locking ring 7 has a one-way locking and fixing effect on the fastening screw ring 4, preventing the fastening screw ring 4 from rotating in the opposite direction, avoiding the occurrence of loosening of the fastening screw ring 4, and further ensuring the sealing and leakage-proof effect of the connection between the drain nozzle 2 and the submersible water tank 1; when the drain nozzle 2 needs to be replaced, the bolt 6 is rotated to first remove the force-bearing support ring 5 from the outside of the drain nozzle 2, and then the large spring 8 and the movable locking ring 7 are removed from the outside of the drain nozzle 2, and finally the fastening screw ring 4 is rotated in the opposite direction to remove the fastening screw ring 4 from the outside of the drain nozzle 2, and the drain nozzle 2 can be taken out from the submersible water tank 1 for replacement, making the replacement of the drain nozzle 2 easier and faster.

[0040] Embodiment 2, on the basis of embodiment 1, a guide frame 203 is provided inside the drain nozzle 2, a guide hole 2031 is provided at the center of the guide frame 203, a movable push rod 9 slides through the guide hole 2031, a perforated plate 204 is provided inside the drain nozzle 2, the movable push rod 9 penetrates the perforated plate 204, a rubber sealing plug 901 is installed at the end of the movable push rod 9, the rubber sealing plug 901 is in contact with the outward side of the perforated plate 204, a small spring 10 is sleeved on the outside of the movable push rod 9, one end of the small spring 10 is in contact with the guide frame 203, and the other end of the small spring 10 is in contact with the guide frame 203 Contact; adopting the above technical scheme, the small spring 10 plays an elastic reset effect on the movable push rod 9, so that the rubber sealing plug 901 is in close contact with the outward side of the orifice plate 204. When the water stored in the submersible water tank 1 flows outward, the water flow pushes the rubber sealing plug 901 open, and the small spring 10 is in a contracted state. When the water stored in the submersible water tank 1 stops flowing outward, the movable push rod 9 is reset under the influence of the thrust of the small spring 10, so that the rubber sealing plug 901 is in contact with the outward side of the orifice plate 204, and the inside of the drain nozzle 2 is sealed by the rubber sealing plug 901, thereby effectively avoiding the occurrence of backflow.

[0041] The working principle of this embodiment is as follows: first, the drain nozzle 2 is inserted into the drain hole 101 provided in the submersible water tank 1, and the guide ridge 201 is connected to the positioning groove 1011 to prevent the drain nozzle 2 from rotating; next, the fastening screw ring 4 is threadedly connected to the outside of the drain nozzle 2, and the fastening screw ring 4 drives the drain nozzle 2 to move outward, exerting pressure on the rubber sealing ring 3, so that the rubber sealing ring 3 is in close contact with the submersible water tank 1 and the drain nozzle 2, thereby sealing the connection between the drain nozzle 2 and the submersible water tank 1; then the large spring 8 and the movable locking ring 7 are sleeved on the outside of the drain nozzle 2, and the guide groove 701 and the guide ridge 201 are slidably matched to guide the movement of the movable locking ring 7; finally, the force-bearing support ring 5 is sleeved on the outer end of the drain nozzle 2, and the force-bearing support ring 5 is fixed by the bolt 6. The movable locking ring 7 is moved under the influence of the thrust of the large spring 8, so that the movable locking ring 7 is in contact with the fastening screw ring 4, and the movable ratchet 401 and the fixed ratchet 702 are in a meshing state. The movable locking ring 7 has a one-way locking and fixing effect on the fastening screw ring 4, preventing the fastening screw ring 4 from rotating in the opposite direction, and avoiding the occurrence of loosening of the fastening screw ring 4; when the water stored in the submersible water tank 1 flows outward, the water flow pushes the rubber sealing plug 901 open, and the small spring 10 is in a contracted state. When the water stored in the submersible water tank 1 stops flowing outward, the movable push rod 9 is reset under the thrust of the small spring 10, so that the rubber sealing plug 901 contacts the outward side of the orifice plate 204, and the inside of the drain nozzle 2 is sealed through the rubber sealing plug 901, effectively avoiding the occurrence of backflow; when the drain nozzle 2 needs to be replaced, the bolt 6 is rotated to first remove the force-bearing support ring 5 from the outside of the drain nozzle 2, and then the large spring 8 and the movable locking ring 7 are removed from the outside of the drain nozzle 2, and finally the fastening screw ring 4 is rotated in the opposite direction to remove the fastening screw ring 4 from the outside of the drain nozzle 2, and the drain nozzle 2 can be taken out from the submersible water tank 1 for replacement, making the replacement of the drain nozzle 2 easier and faster.

[0042] In this article, there are a few points to note:

[0043] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0044] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0045] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. Avoid backflow from the submersible tank drain, including: A submersible water tank (1); characterized in that a drainage hole (101) is provided on the wall of the submersible water tank (1), a drainage nozzle (2) penetrates through the drainage hole (101) provided in the submersible water tank (1), and the inner end edge of the drainage nozzle (2) is bent outwards; The drain nozzle (2) is externally connected to a fastening screw ring (4), and the fastening screw ring (4) is located outside the submersible water tank (1); the outer end of the drain nozzle (2) is sleeved with a force-bearing support ring (5), and the force-bearing support ring (5) is internally connected to two bolts (6), and the bolts (6) are connected to the drain nozzle (2); The outer portion of the drain nozzle (2) is provided with a movable locking ring (7), and the movable locking ring (7) is in contact with the fastening screw ring (4); A movable push rod (9) is installed inside the drainage nozzle (2).

2. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: The drainage nozzle (2) is externally sleeved with a rubber sealing ring (3), one side of the rubber sealing ring (3) is in contact with the drainage nozzle (2), and the other side of the rubber sealing ring (3) is in contact with the inner side of the submersible water tank (1).

3. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: The edge of the drainage hole (101) is provided with a positioning groove (1011) in a circumferential shape, and the outer side of the drainage nozzle (2) is provided with a guiding convex strip (201) in a circumferential shape, and the guiding convex strip (201) is connected to the positioning groove (1011).

4. The backflow-avoiding submersible water tank drain outlet according to claim 3, characterized in that: The guide convex strip (201) is provided with an external thread, the interior of the fastening screw ring (4) is provided with an internal thread, the fastening screw ring (4) is threadedly connected to the drainage nozzle (2), and the fastening screw ring (4) is in contact with the outside of the submersible water tank (1).

5. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: The drain nozzle (2) is provided with two threaded holes (202) on the outside, and the force-bearing support ring (5) is provided with two connecting holes (501) on the inside. The connecting holes (501) are connected to the threaded holes (202) provided on the drain nozzle (2). The bolts (6) are connected to the connecting holes (501) provided on the force-bearing support ring (5), and the ends of the bolts (6) are threadedly connected to the threaded holes (202).

6. The backflow-avoiding submersible water tank drain outlet according to claim 3, characterized in that: The movable locking ring (7) is slidably connected to the drain nozzle (2); a guide groove (701) is provided in a circumferential shape on the inner side of the movable locking ring (7); and the guide groove (701) is slidably connected to a guide convex strip (201) provided on the drain nozzle (2).

7. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: The fastening spiral ring (4) is provided with a movable ratchet (401) in a circumferential shape on the outside, and the movable locking ring (7) is provided with a fixed ratchet (702) in a circumferential shape on the outside, and the fixed ratchet (702) is meshed with the movable ratchet (401) provided on the fastening spiral ring (4).

8. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: A large spring (8) is sleeved on the outside of the drainage nozzle (2), one end of the large spring (8) is in contact with the force-bearing support ring (5), and the other end of the large spring (8) is in contact with the movable locking ring (7).

9. The backflow-avoiding submersible water tank drain outlet according to claim 1, characterized in that: A guide frame (203) is arranged inside the drainage nozzle (2), a guide hole (2031) is arranged at the center of the guide frame (203), a movable push rod (9) slides through the guide hole (2031), an orifice plate (204) is arranged inside the drainage nozzle (2), the movable push rod (9) penetrates the orifice plate (204), a rubber sealing plug (901) is installed at the end of the movable push rod (9), and the rubber sealing plug (901) is in contact with the outward side of the orifice plate (204).

10. The backflow-avoiding submersible water tank drain outlet according to claim 9, characterized in that: A small spring (10) is sleeved on the outside of the movable push rod (9), one end of the small spring (10) is in contact with the guide frame (203), and the other end of the small spring (10) is in contact with the guide frame (203).

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