A deep water control switch

Abstract

The present invention provides a deep water control switch, comprising an upper housing and a push-pull rod movably installed in the upper housing, the push-pull rod having a first position and a second position during the up-and-down movement, the push-pull rod being provided with a moving contact, and two first static contacts and two second static contacts being further provided in the upper housing, the two first static contacts being used to control the on-off of a first conductive circuit, and the two second static contacts being used to control the on-and-off of a second conductive circuit, when the push-pull rod is in the first position, the moving contact electrically connects the two first static contacts, the first conductive circuit is in a conducting state, and the second conductive circuit is in a non-conducting state; when the push-pull rod is in the second position, the moving contact moves to a position that conducts the two second static contacts, the second conductive circuit is in a conducting state, and the first conductive circuit is in a non-conducting state. The present invention switches the conductive circuit by moving the push-pull rod, and this switching method is convenient and quick when in a deep water environment.

Description

Technical Field

[0001] The invention relates to the field of switch control, and in particular to a deep-water control switch. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In deep water environments, such as the field of underwater equipment control, high control requirements are placed on electrical equipment. Switching devices in these environments need to have good waterproof performance and the ability to work reliably under high pressure environments. However, existing deep water switches have shortcomings, especially in terms of ease of operation.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a deep water control switch.

[0006] In order to solve the above technical problems, the present application provides a deep water control switch, including an upper shell and a push-pull rod, the upper shell includes an end cover, the push-pull rod is installed on the end cover through the upper and lower parts, and can move up and down relative to the end cover, a spring is sleeved on the push-pull rod, the spring is located in the upper shell, the upper end of the spring abuts against the end cover, the lower end of the spring acts on the push-pull rod, the push-pull rod has a first position and a second position during the up and down movement, a moving contact is arranged at the lower end of the push-pull rod, and two first static contacts and two second static contacts are also arranged in the upper shell. The parts are arranged in sequence along the direction of movement of the push-pull rod and are electrically isolated from each other. The two first static contacts are used to control the on-off of the first conductive circuit, and the two second static contacts are used to control the on-off of the second conductive circuit. When the push-pull rod is in the first position, the spring is in a compressed state, the moving contact is located at a position to electrically connect the two first static contacts, the first conductive circuit is in a conducting state, and the second conductive circuit is in a non-conducting state; when the push-pull rod moves downward to the second position under the action of the spring, the moving contact moves to a position to conduct the two second static contacts, the second conductive circuit is in a conducting state, and the first conductive circuit is in a non-conducting state.

[0007] Preferably, a fixing hole is provided on the push-pull rod, a pull pin is inserted into the fixing hole, and the pull pin is stuck on the upper side of the end cover to keep the push-pull rod in the first position. When the pull pin is removed, the push-pull rod moves to the second position under the action of the spring.

[0008] Preferably, the interior of the upper shell is a closed cavity, which is an oil cavity filled with medium oil, and the dynamic contact piece, the two first static contact pieces, the two second static contact pieces and the spring are all located in the oil cavity.

[0009] Preferably, the end cover can slide along the inner wall of the upper shell body. In the process of the push-pull rod moving downward from the first position to the second position, the part of the push-pull rod located outside the oil chamber enters the oil chamber, so that the oil pressure in the oil chamber increases. The end cover slides upward along the inner wall of the upper shell body under the action of the oil pressure. The end cover is also provided with an oil filling hole, and a plug is provided on the oil filling hole.

[0010] Preferably, the side wall of the end cover and the inner wall of the upper shell are sealed by at least one first sealing ring, the side wall of the plug and the inner wall of the oil filling hole are sealed by a second sealing ring, the side wall of the push-pull rod and the end cover are sealed by a third sealing ring, and a retaining ring is circumferentially provided on the inner wall of the outlet end of the upper shell, and the retaining ring is used to prevent the end cover from detaching from the upper shell.

[0011] Preferably, a baffle is provided on the push-pull rod, and the baffle is provided close to the lower end of the push-pull rod. The dynamic contact piece is located on the lower side of the baffle. When the push-pull rod is in the first position, the spring is compressed between the baffle and the end cover; when the pull pin is removed, the spring pushes the baffle downward to push the push-pull rod to the second position.

[0012] Preferably, the interior of the upper shell is a stepped structure, including a first cavity, a second cavity and a third cavity coaxially arranged with inner diameters gradually decreasing from top to bottom, the end cover is installed in the first cavity, the end cover is blocked between the retaining ring and the bottom surface of the first cavity, the spring and the baffle are located in the second cavity, and when the push-pull rod moves to the second position, the baffle is blocked by the bottom surface of the second cavity.

[0013] Preferably, an insulating mounting seat is provided in the upper shell body, the insulating mounting seat has a center hole, the insulating mounting seat is embedded with a first conductive ring and a second conductive ring, the first conductive ring and the second conductive ring are stacked up and down, the first conductive ring includes two first conductive half rings arranged oppositely, the second conductive ring includes two second conductive half rings arranged oppositely, the first static contact piece is the first conductive half ring, the second static contact piece is the second conductive half ring, the two first conductive half rings, the two second conductive half rings and the first conductive ring and the second conductive ring are insulated and isolated by the insulating mounting seat, the center hole of the mounting seat, the center hole of the first conductive ring and the center hole of the second conductive ring are coaxially arranged and have the same shape and size, the three center holes are combined to form a central channel, and the inner wall of the first conductive ring and the inner wall of the second conductive ring constitute a part of the inner wall of the central channel.

[0014] Preferably, the lower end of the push-pull rod can move up and down in the central channel, and the dynamic contact piece is a contact ring sleeved on the lower end of the push-pull rod. When the push-pull rod is in the first position, the contact ring contacts the first conductive ring, and the two first conductive half rings are connected; when the push-pull rod is in the second position, the lower end of the push-pull rod moves downward along the central channel to the position where the contact ring contacts the second conductive ring, and the two second conductive half rings are connected.

[0015] Preferably, the contact ring is provided with a circle of grooves along its circumference, and an annular elastic member or an annular oblique spring coil with conductive properties is installed in the groove.

[0016] Preferably, the lower end portion of the push-pull rod is stepped, including a large diameter section and a small diameter section arranged on the lower side of the large diameter section. The large diameter section and the small diameter section are coaxially arranged, and the large diameter section and the small diameter section are covered with an insulating sleeve. The insulating sleeve of the small diameter section is outer-circuited with the contact ring. When the push-pull rod is in the second position, the insulating sleeve portion outside the large diameter section is located in the center hole of the first conductive ring, the two first conductive half rings are respectively connected to the first wire and the second wire, and the two second conductive half rings are respectively connected to the third wire and the fourth wire.

[0017] Preferably, the deep water control switch also includes a lower shell, which is installed at the lower end of the upper shell, and the lower shell is sealed and connected to the upper shell. A base is installed in the lower shell, and a first pin, a second pin, a third pin and a fourth pin are installed on the base. The first pin, the second pin, the third pin and the fourth pin are electrically connected to the first wire, the second wire, the third wire and the fourth wire respectively. The first pin and the second pin are used to connect the first conductive circuit, and the third pin and the fourth pin are used to connect the second conductive circuit. The upper ends of the first pin, the second pin, the third pin and the fourth pin are located in the oil chamber, and the lower ends of the first pin, the second pin, the third pin and the fourth pin pass through the base and are located outside the oil chamber. The mounting seat is installed in the third cavity, and the lower shell is installed at the lower port of the third cavity.

[0018] Preferably, the outer wall of the lower shell is circumferentially provided with a flange, the upper port of the lower shell is inserted into the lower port of the lower shell, the outer wall of the upper port of the lower shell and the inner wall of the upper shell are sealed by a fourth sealing ring, and the upper end surface of the flange and the lower end surface of the upper shell are sealed by a fifth sealing ring.

[0019] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] 1. The deep water control switch of the present invention switches the first conductive circuit and the second conductive circuit by moving the push-pull rod. When in a deep water environment, this switching method is convenient, fast and efficient.

[0021] 2. A closed cavity is formed inside the deepwater control switch, and the cavity is filled with dielectric oil. In a deepwater environment, the structure utilizes the incompressibility of the oil to offset the external pressure and the internal pressure, thereby achieving internal and external equal pressure balance.

[0022] 3. The end cover of the deep water control switch can slide up and down along the inner wall of the upper shell to achieve the balance of pressure inside and outside the oil chamber. Especially when switching the circuit, the push-pull rod moves downward to squeeze the oil chamber, and the end cover moves upward to balance the pressure in the oil chamber, so that the oil chamber is always balanced with the external pressure.

[0023] 4. The deepwater control switch is equipped with a multi-layer sealing structure with good sealing performance, which can effectively prevent water from entering the cavity in the deepwater environment, thereby improving the overall reliability and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram when the push-pull rod of the deep water control switch of the present application is in the first position.

[0025] Figure 2 It is a structural schematic diagram when the push-pull rod of the deep water control switch of the present application is in the second position.

[0026] Figure 3 yes Figure 1 A partial enlarged view of .

[0027] Figure 4 yes Figure 2 A partial enlarged view of .

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the insulating mounting base and the conductive ring.

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the upper shell of the present application.

[0030] Among them: 1. upper shell; 11. first cavity; 12. second cavity; 13. third cavity; 2. lower shell; 10. oil cavity; 3. push-pull rod; 31. pull pin; 32. baffle; 33. first step; 34. second step; 35. fixing hole; 4. end cover; 41. retaining ring; 42. plug; 43. spring; 51. insulating mounting seat; 52. first conductive ring; 53. second conductive ring; 521. first wire; 522. second wire; 531. third wire; 532. fourth wire; 61. contact ring; 62. annular elastic member; 63. insulating sleeve; 71. first pin; 72. second pin; 73. third pin; 70. base; 81. first sealing ring; 82. second sealing ring; 83. third sealing ring; 84. fourth sealing ring; 85. fifth sealing ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments 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.

[0032] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] like Figure 1 and 2As shown, a deep water control switch of the present invention comprises an upper housing 1 and a push-pull rod 3 which is movably installed in the upper housing 1, wherein the push-pull rod 3 has a first position and a second position during the upward and downward movement, and the push-pull rod 3 is provided with a moving contact, and the upper housing 1 is also provided with two first static contacts and two second static contacts, wherein the two first static contacts are used to control the on and off of the first conductive circuit, and the two second static contacts are used to control the on and off of the second conductive circuit. The two first static contacts and the two second static contacts are arranged in sequence along the moving direction of the push-pull rod 3, and are electrically isolated from each other.

[0034] like Figure 1 As shown, the push-pull rod 3 is in the first position, the moving contact electrically connects the two first static contacts, the first conductive circuit is in a conducting state, and the second conductive circuit is in a non-conducting state. Figure 2 As shown, when the push-pull rod 3 is in the second position, the moving contact moves to a position that connects the two second static contacts, the second conductive circuit is in a conductive state, and the first conductive circuit is in a non-conductive state.

[0035] The upper shell 1 includes an end cover 4, the push-pull rod 3 is arranged on the end cover 4 through the upper and lower parts, a baffle 32 is arranged on the push-pull rod 3, the baffle 32 is located on the lower side of the end cover 4, the spring 43 is sleeved on the push-pull rod 3, the moving contact is located on the lower side of the baffle 32, when the push-pull rod 3 is in the first position, the spring 43 is compressed between the baffle 32 and the end cover 4. A fixing hole 35 is provided on the push-pull rod 3, the locking member is a pull pin 31 inserted in the fixing hole 35, the pull pin 31 is stuck on the upper side of the end cover 4, and the push-pull rod 3 is kept in the first position, when the pull pin 31 is removed, the push-pull rod 3 moves to the second position under the action of the spring 43. When it is necessary to switch the state of the first conductive circuit to the state of the second conductive circuit, it is only necessary to pull the pull pin 31 out of the fixing hole 35 to realize the circuit switching. In a deep water environment, this switching method is convenient and fast.

[0036] like Figure 3 and 4As shown, an insulating mounting seat 51 is provided in the upper shell 1, and the insulating mounting seat 51 has a center hole. The insulating mounting seat 51 is embedded with a first conductive ring 52 and a second conductive ring 53. The first conductive ring 52 includes two first conductive half rings arranged opposite to each other, and the second conductive ring 53 includes two second conductive half rings arranged opposite to each other. The first static contact piece is the first conductive half ring, and the second static contact piece is the second conductive half ring. The two first conductive half rings, the two second conductive half rings, and the first conductive ring 52 and the second conductive ring 53 are insulated and isolated by the insulating mounting seat 51. The center hole of the mounting seat, the center hole of the first conductive ring 52, and the center hole of the second conductive ring 53 are coaxially arranged and have the same shape and size. The three center holes are combined to form a central channel. The inner wall of the first conductive ring 52 and the inner wall of the second conductive ring 53 constitute a part of the inner wall of the central channel. The lower end of the push-pull rod 3 can move up and down in the central channel. The moving contact is a contact ring 61 sleeved on the lower end of the push-pull rod 3. When the push-pull rod 3 is in the first position, the contact ring 61 contacts the first conductive ring 52 to connect the two first conductive semi-rings. When the push-pull rod 3 is in the second position, the lower end of the push-pull rod 3 moves downward along the central channel until the contact ring 61 contacts the second conductive ring 53 to connect the two second conductive semi-rings. This structure enables the first conductive ring 52 and the second conductive ring 53 to be compactly arranged together. The central channel enables the push-pull rod 3 to move smoothly therein. In addition, the insulating mounting seat 51 ensures the insulation isolation between the first conductive ring 52 and the second conductive ring 53, preventing accidental short circuits and improving the safety of the equipment.

[0037] The contact ring 61 is provided with a circle of grooves along its circumference, and an annular elastic member 62 or an annular oblique spring coil with conductive properties is installed in the groove. The function of the annular elastic member or the annular oblique spring coil is to ensure reliable contact between the dynamic contact member and the static contact member. Specifically, the annular elastic member 62 or the annular oblique spring coil provides the necessary elastic force to ensure that even when the switch is affected by the external environment, the contact ring 61 can be electrically connected to the first conductive ring 52 or the second conductive ring 53, thereby ensuring the stability and reliability of the electrical connection.

[0038] like Figure 3 and 4 As shown, the lower end of the push-pull rod 3 is stepped, including a large diameter section and a small diameter section arranged below the large diameter section. The large diameter section and the small diameter section are coaxially arranged, and the large diameter section and the small diameter section are covered with an insulating sleeve 63. The insulating sleeve 63 of the small diameter section is covered with the contact ring 61. When the push-pull rod 3 is in the second position, the insulating sleeve 63 outside the large diameter section is partially located in the center hole of the first conductive ring 52. Figure 3-5As shown, the two first conductive half rings are connected to the first conductive wire 521 and the second conductive wire 522 respectively, and the two second conductive half rings are connected to the third conductive wire 531 and the fourth conductive wire 532 respectively.

[0039] The deep water control switch further comprises a lower housing 2, which is mounted at the lower end of the upper housing 1. A base 70 is mounted in the lower housing 2, and a first pin 71, a second pin 72, a third pin 73 and a fourth pin are mounted on the base 70. The first pin 71, the second pin 72, the third pin 73 and the fourth pin are respectively electrically connected to the first wire 521, the second wire 522, the third wire 531 and the fourth wire 532. When the deep water control switch is connected to a controlled device, the controlled device comprises a first conductive loop and a second conductive loop, the first pin 71 and the second pin 72 are used to connect the first conductive loop, and the third pin 73 and the fourth pin are used to connect the second conductive loop.

[0040] like Figure 1 and 2 As shown, the lower shell 2 is sealedly connected to the upper shell 1, and a closed cavity is formed between the end cover 4 and the base 70 of the lower shell 2, and the cavity is filled with dielectric oil. In a deep water environment, the external environmental pressure is large, and the closed cavity filled with dielectric oil can maintain the balance of internal and external pressures. The interior of the upper shell 1 is a stepped structure, including a first cavity 11, a second cavity 12 and a third cavity 13 coaxially arranged with the inner diameter gradually decreasing from top to bottom, the end cover 4 is installed in the first cavity 11, the mounting seat is installed in the third cavity 13, the spring 43 is located in the second cavity 12, and the lower shell 2 is installed at the lower port of the third cavity 13. The end cover 4 can slide along the side wall of the first cavity 11. A retaining ring 41 is also installed at the outlet end of the first cavity 11. The end cover 4 is blocked between the retaining ring 41 and the bottom surface of the first cavity 11. In the process of the push-pull rod 3 moving downward from the first position to the second position, the part of the push-pull rod 3 outside the oil cavity enters the oil cavity, so that the oil pressure in the oil cavity increases, and the end cover 4 slides upward along the side wall of the first cavity 11. The movement of the end cover 4 helps to balance the internal pressure of the oil cavity 10. When the push-pull rod 3 moves downward, the end cover 4 slides upward synchronously, which can provide new space for the squeezed medium oil, not only ensuring the smooth movement of the push-pull rod 3, but also maintaining the pressure balance inside and outside the entire oil cavity 10.

[0041] The baffle 32 on the push-pull rod 3 is located in the second cavity 12. When the pull rod moves to the second position, the baffle 32 is blocked by the bottom surface of the second cavity 12. The baffle 32 acts as a limiter in the second cavity 12 to ensure that the push-pull rod 3 does not continue to move downward when it moves to the second position, thereby accurately controlling the position of the push-pull rod 3 and ensuring that the contact ring 61 moves to a position where it can electrically contact the second conductive ring 53.

[0042] like Figure 1 and 2 As shown, the end cover 4 is also provided with an oil filling hole, and the oil filling hole is provided with a plug 42. The side wall of the end cover 4 and the inner wall of the first cavity 11 are sealed by at least one first sealing ring 81, the side wall of the plug 42 and the inner wall of the oil filling hole are sealed by a second sealing ring 82, and the side wall of the pull rod and the end cover 4 are sealed by a third sealing ring 83. The side wall of the lower shell 2 is provided with a circle of flanges along the circumferential direction, the upper port of the lower shell 2 is inserted into the lower port of the third cavity 13, the outer wall of the upper port of the lower shell 2 and the inner wall of the third cavity 13 are sealed by a fourth sealing ring 84, and the upper end surface of the flange and the lower end surface of the upper shell 1 are sealed by a fifth sealing ring 85. Through these sealing designs, the deep water control switch can effectively prevent water in the deep water environment from entering the cavity, thereby improving the overall reliability and service life of the equipment.

[0043] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A deep water control switch, characterized in that: The invention comprises an upper shell (1) and a push-pull rod (3), wherein the upper shell (1) comprises an end cover (4), and the push-pull rod (3) is installed on the end cover (4) so ​​as to penetrate the end cover (4) vertically and can move vertically relative to the end cover (4). A spring (43) is sleeved on the push-pull rod (3). The spring (43) is located in the upper shell (1). The upper end of the spring (43) abuts against the end cover (4), and the lower end of the spring (43) acts on the push-pull rod (3). The push-pull rod (3) has a first position and a second position during the upward and downward movement. A moving contact piece is provided at the lower end of the push-pull rod (3). The upper shell (1) is further provided with two first static contacts and two second static contacts. The two first static contacts and the two second static contacts are arranged in sequence along the direction of movement of the push-pull rod (3) and are electrically isolated from each other. The two first static contacts are used to control the on and off of the first conductive circuit, and the two second static contacts are used to control the on and off of the second conductive circuit. When the push-pull rod (3) is in the first position, the spring (43) is in a compressed state, the dynamic contact is located at a position to electrically connect the two first static contacts, the first conductive circuit is in a conducting state, and the second conductive circuit is in a non-conducting state; when the push-pull rod (3) moves downward to the second position under the action of the spring (43), the dynamic contact is located at a position to conduct the two second static contacts, the second conductive circuit is in a conducting state, and the first conductive circuit is in a non-conducting state. The push-pull rod (3) is provided with a fixing hole (35), a pull pin (31) is inserted into the fixing hole (35), and the pull pin (31) is stuck on the upper side of the end cover (4) to keep the push-pull rod (3) in the first position. When the pull pin (31) is removed, the push-pull rod (3) moves to the second position under the action of the spring (43). An insulating mounting seat (51) is provided in the upper shell (1), and the insulating mounting seat (51) has a central hole. The insulating mounting seat (51) is embedded with a first conductive ring (52) and a second conductive ring (53), and the first conductive ring (52) and the second conductive ring (53) are stacked up and down. The first conductive ring (52) comprises two first conductive half rings arranged opposite to each other, the second conductive ring (53) comprises two second conductive half rings arranged opposite to each other, the first static contact piece is the first conductive half ring, and the second static contact piece is the second conductive half ring. The two first conductive half rings, the two second conductive half rings, and the first conductive ring (52) and the second conductive ring (53) are insulated and isolated by the insulating mounting seat (51). The center hole of the mounting seat, the center hole of the first conductive ring (52) and the center hole of the second conductive ring (53) are coaxially arranged and have the same shape and size. The three center holes are combined to form a central channel. The inner wall of the first conductive ring (52) and the inner wall of the second conductive ring (53) constitute a part of the inner wall of the central channel. The lower end of the push-pull rod (3) can move up and down in the central channel, and the movable contact piece is a contact ring (61) sleeved on the lower end of the push-pull rod (3). When the push-pull rod (3) is in the first position, the contact ring (61) contacts the first conductive ring (52), and the two first conductive half rings are conductive; when the push-pull rod (3) is in the second position, the lower end of the push-pull rod (3) moves downward along the central channel to the position where the contact ring (61) contacts the second conductive ring (53), and the two second conductive half rings are conductive.

2. The deep water control switch according to claim 1, characterized in that: The interior of the upper shell is a sealed cavity, which is an oil cavity (10) filled with medium oil. The dynamic contact piece, two first static contact pieces, two second static contact pieces and the spring are all located in the oil cavity (10).

3. The deep water control switch according to claim 2, characterized in that: The end cover (4) can slide along the inner wall of the upper shell (1). When the push-pull rod (3) moves downward from the first position to the second position, a portion of the push-pull rod (3) located outside the oil chamber enters the oil chamber, thereby increasing the oil pressure in the oil chamber. Under the action of the oil pressure, the end cover (4) slides upward along the inner wall of the upper shell (1). The end cover (4) is also provided with an oil filling hole, and a plug (42) is provided on the oil filling hole.

4. The deep water control switch according to claim 3, characterized in that: The side wall of the end cover (4) and the inner wall of the upper shell (1) are sealed by at least one first sealing ring (81), the side wall of the plug (42) and the inner wall of the oil filling hole are sealed by a second sealing ring (82), and the side wall of the push-pull rod (3) and the end cover (4) are sealed by a third sealing ring (83). The inner wall of the outlet end of the upper shell (1) is provided with a retaining ring (41) along the circumferential direction, and the retaining ring (41) is used to prevent the end cover (4) from separating from the upper shell (1).

5. The deep water control switch according to claim 4, characterized in that: The push-pull rod (3) is provided with a baffle (32), and the baffle (32) is arranged near the lower end of the push-pull rod. The moving contact piece is located on the lower side of the baffle (32). When the push-pull rod (3) is in the first position, the spring (43) is compressed between the baffle (32) and the end cover (4). When the pull pin (31) is removed, the spring (43) pushes the baffle (32) downward, pushing the push-pull rod (3) to the second position.

6. The deep water control switch according to claim 5, characterized in that: The interior of the upper shell (1) is a stepped structure, comprising a first cavity (11), a second cavity (12) and a third cavity (13) which are coaxially arranged and have inner diameters that gradually decrease from top to bottom. The end cover (4) is installed in the first cavity (11), and the end cover (4) is blocked between the retaining ring (41) and the bottom surface of the first cavity (11). The spring (43) and the baffle (32) are located in the second cavity (12). When the push-pull rod (3) moves to the second position, the baffle (32) is blocked by the bottom surface of the second cavity (12).

7. The deep water control switch according to claim 6, characterized in that: The contact ring (61) is provided with a circle of grooves along its circumference, and an annular elastic member (62) or an annular oblique spring coil with conductive properties is installed in the groove.

8. The deep water control switch according to claim 7, characterized in that: The lower end of the push-pull rod (3) is stepped, comprising a large diameter section and a small diameter section arranged below the large diameter section. The large diameter section and the small diameter section are coaxially arranged. The large diameter section and the small diameter section are covered with an insulating sleeve (63). The insulating sleeve (63) of the small diameter section is provided with the contact ring (61) on its outer sleeve. When the push-pull rod (3) is in the second position, the insulating sleeve (63) outside the large diameter section is partially located in the center hole of the first conductive ring (52). The two first conductive half rings are respectively connected to the first conductive wire (521) and the second conductive wire (522), and the two second conductive half rings are respectively connected to the third conductive wire (531) and the fourth conductive wire (532).

9. The deep water control switch according to claim 8, characterized in that: The deep water control switch further comprises a lower shell (2), wherein the lower shell (2) is mounted at the lower end of the upper shell (1), and the lower shell (2) is sealedly connected to the upper shell (1). A base (70) is mounted in the lower shell (2), and a first plug pin (71), a second plug pin (72), a third plug pin (73) and a fourth plug pin are mounted on the base (70). The first plug pin (71), the second plug pin (72), the third plug pin (73) and the fourth plug pin are electrically connected to the first wire (521), the second wire (522), the third wire (531) and the fourth wire (532) respectively. The first plug pin (71) and the second plug pin (72) are used to connect the first conductive circuit, and the third plug pin (73) and the fourth plug pin are used to connect the second conductive circuit. The upper ends of the first plug pin (71), the second plug pin (72), the third plug pin (73) and the fourth plug pin are located in the oil chamber (10), and the lower ends of the first plug pin (71), the second plug pin (72), the third plug pin (73) and the fourth plug pin pass through the base (70) and are located outside the oil chamber (10). The mounting seat is installed in the third cavity (13), and the lower shell (2) is installed at the lower port of the third cavity (13).

10. The deep water control switch according to claim 9, characterized in that: The outer wall of the lower shell (2) is provided with a circle of flanges along the circumferential direction, the upper port of the lower shell (2) is inserted into the lower port of the lower shell (2), the outer wall of the upper port of the lower shell (2) and the inner wall of the upper shell (1) are sealed by a fourth sealing ring (84), and the upper end surface of the flange and the lower end surface of the upper shell (1) are sealed by a fifth sealing ring (85).

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