A valve core separation vacuum valve for use in a plug pulling and vacuuming operation and a method of using the same

Abstract

The present application belongs to the field of vacuum valve, and discloses a valve core separation vacuum valve for plug-pulling vacuum operation and a use method thereof. The valve core separation vacuum valve for plug-pulling vacuum operation comprises a valve body and a valve core separated from the valve body. In the use method, the valve core separation vacuum valve is used as a vacuum tank switch, and has a closed state and an open state. In the use method, vacuum tank vacuumization is performed by connecting the valve core separation vacuum valve, closing the valve core separation vacuum valve, opening the valve core separation vacuum valve, vacuumizing, releasing the locking of the valve core separation vacuum valve, sealing the vacuum tank, locking the valve core separation vacuum valve, and removing the valve core separation vacuum valve. The valve core separation vacuum valve for plug-pulling vacuum operation has simple structure and convenient operation, can be used as an independent self-sealing vacuum valve, and can also be used for plug-pulling vacuum operation of a plug-sealed vacuum insulated container. In the use method, the axial movement and the circumferential rotation of the valve rod are decoupled, the risk of vacuum leakage in the plug-pulling vacuum operation is avoided, and the use method has engineering practical value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of vacuum valves, and particularly relates to a valve core separation vacuum valve for plug pulling and vacuum pumping operation and a use method thereof. BACKGROUND

[0002] A vacuum valve refers to a vacuum system element used to change the direction of air flow, adjust the size of air flow, cut off or connect a pipeline in a vacuum system; the working pressure of the vacuum valve is lower than the standard atmospheric pressure, and a rubber sealing ring or a metal sealing ring is usually used for sealing. In vacuum pumping operation, the vacuum valve is usually used together with a vacuum pump and pressure instruments; one end of the vacuum valve is connected to a vacuum tank, and the other end is connected to the vacuum pump and the pressure instruments through a tee pipe; the pressure value in the vacuum tank is detected by using the pressure instruments; and the air in the vacuum tank is compressed and discharged by the vacuum pump through the vacuum valve to achieve the purpose of vacuum pumping.

[0003] For some plug type sealed vacuum insulated containers that are not convenient to specially set vacuum valves, such as small Dewar, after vacuum pumping is completed, the sealing plug needs to be pushed into the sealing interface of the vacuum tank by using the vacuum valve; and vacuum leakage cannot occur in the process of pulling out and pushing in the sealing plug. Therefore, a valve core separation vacuum valve with simple structure, convenient operation and reliable sealing needs to be applied to plug pulling and vacuum pumping operation.

[0004] Chinese invention patent application CN106764013A published on May 31, 2017 discloses a high vacuum push-pull valve composed of a hand wheel, two stop bolts, a movable joint, a hand valve rod, a stop nut and a valve body. The high vacuum push-pull valve uses two parallel axial sealing rings to simultaneously realize axial translational sealing and circumferential rotational sealing of the hand valve rod, and is simple to operate and convenient to install, but vacuum leakage may occur in the process of axial movement and circumferential rotation of the hand valve rod.

[0005] Chinese invention patent application CN114151556A published on March 8, 2022 discloses a mechanical vacuum pull valve, which includes a shell, a pull piece, an upper corrugated pipe, an outer locking assembly and an inner locking assembly, and can realize zero leakage in the process of opening and closing the vacuum plug. The mechanical vacuum pull valve skillfully avoids circumferential rotational operation of the valve rod, and realizes opening and closing of the vacuum plug by means of axial pulling of the valve rod and the vacuum plug connecting seat through the clamping of the elastic sheet, but the structure is extremely complex, the assembly precision is high, and the operation is inconvenient.

[0006] At present, it is urgent to develop a valve core separation vacuum valve for plug pulling and vacuum pumping operation and a use method thereof. SUMMARY

[0007] The present application discloses a valve core separation vacuum valve for plug pulling and vacuum pumping operation, and a method for using the valve core separation vacuum valve.

[0008] The valve core separation vacuum valve for plug pulling and vacuum pumping operation comprises a valve body and a valve core separated from the valve body.

[0009] The valve body is a pipe body, and sequentially comprises a valve body front part, a valve body middle part, a vacuum bellows, a valve body rear part, a valve body rear cover and a handle from front to back. The valve body middle part, the vacuum bellows and the valve body rear part are sealed by a KF sealing element. The center cavity of the valve body is penetrated by a valve rod from front to back. The front end of the valve rod is fixedly connected with a valve core screw matched with the valve core through a cylindrical pin. The rear end of the valve rod is fixedly connected with the handle through a fixing screw. The handle drives the valve rod to move forward and backward and rotate. The KF sealing element is a quick flange sealing element, which is a sealing element commonly used in a vacuum system to realize flange connection sealing. KF is the abbreviation of "Klein Flansch" in German, meaning small flange. The KF sealing element cooperates with the flange to connect various components of the vacuum system and ensure sealing. The KF sealing element is usually a rubber or plastic sealing element.

[0010] The front interface of the valve body front part is matched with the interface of the vacuum box. The valve body middle part is provided with a side interface connected with a vacuum pump and a rotating boss. An open pin is arranged on the rotating boss. A limiting screw is fixed on the open pin and rotates around the open pin. A U-shaped groove matched with the limiting screw is arranged on the handle. The limiting screw is clamped into the U-shaped groove. Two nuts are arranged on the rear part of the limiting screw. Each nut is moved forward and backward along the limiting screw, fixed and clamped to the limiting screw according to the position of the limiting screw clamped into the U-shaped groove. An O-shaped sealing ring is arranged between the valve body rear part and the valve rod.

[0011] The valve core separation vacuum valve decouples the axial movement and the circumferential rotation of the valve rod. The axial movement of the valve rod is compensated by the vacuum bellows. The static sealing between the vacuum bellows and the valve body is realized by the KF sealing element. The O-shaped sealing ring realizes the dynamic sealing of the valve rod rotating to a fixed point. The vacuum sealing reliability of the valve core separation vacuum valve is improved.

[0012] Further, three shaft shoulders are arranged on the valve rod from rear to front. The first shaft shoulder is located at the connection between the handle and the valve body rear cover, and is used to limit the forward movement of the handle. The second shaft shoulder is located at the interface between the valve body rear part and the valve body rear cover, and is used to limit the rearward movement of the valve rod. The third shaft shoulder is located at a position determined according to the length of the valve rod on the left side of the third shaft shoulder and the total length of the valve body front part and the valve body middle part. The farthest position of the forward movement of the valve rod is the front interface of the valve body front part.

[0013] Further, the rear end of the valve rod is connected with the handle part in a waist-shaped rod matched with a rectangular hole of the handle, and the waist-shaped rod of the valve rod is inserted into the rectangular hole of the handle to be fixed, so that the handle drives the valve rod to rotate.

[0014] Further, the KF seal comprises a clamp and a vacuum sealing ring, the clamp tightly clamps adjacent sections, and the vacuum sealing ring seals the section interfaces.

[0015] Further, a limiting table is arranged in the interface of the vacuum box to prevent the valve core from entering the inner cavity of the vacuum box, or a limiting table is not arranged in the interface of the vacuum box, and the third shaft shoulder of the valve rod is used to limit the forward movement of the valve rod, so that the limit position of the forward movement of the valve rod is the interface of the front part of the valve body, and the valve core and the valve rod are prevented from entering the inner cavity of the vacuum box.

[0016] The use method of the valve core separation vacuum valve for plug pulling and vacuumizing operation of the application comprises the following steps:

[0017] The valve core separation vacuum valve as a vacuum box switch has a closed state and an open state.

[0018] In the closed state, the valve core is arranged in the interface of the vacuum box, the valve core screw is screwed into the valve core, the vacuum box air inlet and the vacuum pump air inlet are closed, the limiting screw rod is clamped into the U-shaped groove of the handle, and the two nuts tightly clamp the limiting screw rod.

[0019] In the open state, on the basis of the closed state, the limiting screw rod is separated from the handle, the handle pulls the valve core backward to arrange the valve core in the middle section of the valve body, and the vacuum box air inlet and the vacuum pump air inlet are opened.

[0020] The vacuum box is vacuumized, including the following steps:

[0021] S10. Connecting the valve core separation vacuum valve.

[0022] The valve core is arranged in the interface of the vacuum box, the KF seal is used to connect the interface of the vacuum box with the front interface of the front part of the valve body, the side interface is connected with the vacuum pump, and the handle is located at an initial position.

[0023] S20. Closing the valve core separation vacuum valve.

[0024] The two nuts on the limiting screw rod are loosened, the limiting screw rod is rotated clockwise around the split pin to be separated from the handle, the handle drives the valve rod to move forward, the handle is rotated in a forward direction, the valve core screw is screwed into the valve core, and the vacuum box air inlet and the vacuum pump air inlet are closed.

[0025] S30. Opening the valve core separation vacuum valve.

[0026] The handle is pulled backward, the valve rod pulls out the valve core from the interface of the vacuum box, the valve core enters the middle section of the valve body, and the vacuum box air inlet and the vacuum pump air inlet are opened.

[0027] S40. Vacuumizing;

[0028] The limiting screw rotates clockwise around the split pin, the limiting screw is clamped into the U-shaped slot of the handle, the positions of the two nuts are adjusted, the two nuts clamp the limiting screw, and the valve core separation vacuum valve is locked; the vacuum pump is opened, and the vacuum tank is vacuumized;

[0029] S50. Unlocking the valve core separation vacuum valve;

[0030] After the vacuumizing is finished, the vacuum pump is closed; the two nuts are loosened, the limiting screw rotates clockwise around the split pin, and the limiting screw is separated from the handle, so that the valve core separation vacuum valve is unlocked;

[0031] S60. Sealing the vacuum tank;

[0032] The handle is pushed forward, the valve rod drives the lower valve core to be inserted into the interface of the vacuum tank, and the lower valve core is clamped under the action of the sealing ring around the valve core; the handle is reversely rotated, so that the valve core screw of the valve rod is separated from the valve core; the valve core is left in the interface of the vacuum tank, and the vacuum tank is sealed;

[0033] S70. Locking the valve core separation vacuum valve;

[0034] The handle is pulled backward, the valve rod is withdrawn from the interface of the vacuum tank, and reaches the initial position; the limiting screw rotates counterclockwise around the split pin, the limiting screw is clamped into the U-shaped slot of the handle, the positions of the two nuts are adjusted, the two nuts clamp the limiting screw, and the valve core separation vacuum valve is locked;

[0035] S80. Disassembling the valve core separation vacuum valve;

[0036] The KF seal at the connection between the interface of the vacuum tank and the front part of the valve body is disassembled, and the KF seal at the connection between the side interface and the vacuum pump is disassembled; the vacuum tank, the vacuum pump and the valve core separation vacuum valve used for plug pulling and vacuumizing are separated, and are respectively arranged, and the vacuumizing of the vacuum tank is completed.

[0037] The valve core separation vacuum valve used for plug pulling and vacuumizing and the using method thereof have the following characteristics:

[0038] 1. The axial movement and the circumferential rotation of the valve rod are decoupled through the sealing structure design, the vacuum leakage in the axial movement process is eliminated, and the risk of vacuum leakage in the circumferential rotation process is reduced; the axial movement of the valve rod is compensated through the vacuum bellows, reliable static sealing is realized between the vacuum bellows and the valve body through the KF seal, and the sealing risk in the axial movement process of the valve rod is effectively avoided; the O-shaped sealing ring is used to realize the circumferential fixed-point rotation sealing of the valve rod, and the vacuum sealing reliability of the vacuum valve is improved;

[0039] 2. The valve core can be pushed in and pulled out during the vacuum operation, and can also realize the opening and closing control, and can realize the sealing and communication of the front gas channel and the side gas channel;

[0040] 3. The valve stem and the valve core can be separated and connected according to the needs during work; when the vacuum operation is not performed, the valve stem and the valve core are separated, and the valve core is left in the vacuum box interface to seal the vacuum box; when the vacuum operation is performed, the valve core moves out of the vacuum box interface with the valve stem, so that the vacuum box is communicated with the air cavity of the vacuum pump; the vacuum method is simple and convenient, and the work efficiency is improved;

[0041] 4. Generally, the valve core is repeatedly pulled out and pushed in during the repeated operation of the vacuum valve, and is a vulnerable part; the valve core in the application is a connecting part, which is convenient to maintain and replace, and improves the convenience and economy of the valve core separation vacuum valve;

[0042] 5. The nut on the limiting screw can move freely on the limiting screw, and the position of the nut can be flexibly adjusted according to the different degrees of expansion and contraction of the bellows in various working states, so that the convenience of the movement and limiting of the valve stem is improved;

[0043] 6. The valve core separation vacuum valve can reduce the occupied area during storage and improve safety by limiting the valve stem; and can also prevent the axial movement of the valve stem and the rotation of the limiting screw during the vacuum operation, thereby improving the stability.

[0044] The valve core separation vacuum valve for plug pulling vacuum operation has simple structure and convenient operation, can be used as an independent self-sealing vacuum valve, and can also be used for plug pulling vacuum operation of a plug sealing vacuum insulated container. The use method of the valve core separation vacuum valve for plug pulling vacuum operation decouples the axial movement of the valve stem and the circumferential rotation sealing, eliminates the vacuum leakage during the axial movement of the valve stem, reduces the risk of vacuum leakage during the circumferential rotation, ensures the sealing of the vacuum valve during the plug pulling vacuum process, avoids the risk of vacuum leakage during the plug pulling vacuum process, improves the operation convenience and sealing reliability of the vacuum valve, and has engineering practical value. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a structure schematic view (perspective view) of the valve core separation vacuum valve for plug pulling vacuum operation of the application;

[0046] Figure 2 It is a structure schematic view (cross-sectional view) of the valve core separation vacuum valve for plug pulling vacuum operation of the application;

[0047] Figure 3 It is a schematic view of the cross section of the valve stem and the handle connection part of the valve core separation vacuum valve for plug pulling vacuum operation of the application;

[0048] Figure 4 Fig. 1 is a schematic view of a closing state of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0049] Figure 5 Fig. 2 is a schematic view of an opening state of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0050] Figure 6 Fig. 3 is a schematic view of a valve core separation vacuum valve state for an S10 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0051] Figure 7 Fig. 4 is a schematic view of a valve core separation vacuum valve state for an S20 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0052] Figure 8 Fig. 5 is a schematic view of a valve core separation vacuum valve state for an S30 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0053] Figure 9 Fig. 6 is a schematic view of a valve core separation vacuum valve state for an S40 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0054] Figure 10 Fig. 7 is a schematic view of a valve core separation vacuum valve state for an S50 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0055] Figure 11 Fig. 8 is a schematic view of a valve core separation vacuum valve state for an S60 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0056] Figure 12 Fig. 9 is a schematic view of a valve core separation vacuum valve state for an S70 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention;

[0057] Figure 13 Fig. 10 is a schematic view of a valve core separation vacuum valve state for an S80 step of a vacuuming method of a valve core separation vacuum valve for a plug pulling and vacuuming operation according to the present invention.

[0058] In the drawings, 1. Valve body front part; 2. Valve core; 3. Valve core screw; 4. Valve stem; 5. KF seal; 6. Vacuum bellows; 7. Valve body rear part; 8. Valve body rear cover; 9. Handle; 10. Set screw; 11. Nut; 12. O-ring; 13. Limiting screw; 14. Split pin; 15. Cylindrical pin; 16. Vacuum tank. DETAILED DESCRIPTION

[0059] The operation mode of the present application is illustrated by specific examples below, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. The present application can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made based on different views and applications without departing from the spirit of the present application.

[0060] Embodiment: As shown in Figure 1 , Figure 2 , the valve core separation vacuum valve for plug pulling and vacuumizing operation of the present embodiment comprises a valve body and a valve core 2 separated from the valve body; the valve core 2 is placed in the interface of the vacuum box 16 with a sealing ring around it;

[0061] The valve body is a pipe body, and from front to back, it is the valve body front part 1, the valve body middle section, the vacuum bellows 6, the valve body rear part 7, the valve body rear cover 8 and the handle 9. The valve body middle section, the vacuum bellows 6 and the valve body rear part 7 are sealed by the KF sealing element 5. The valve rod 4 penetrates through the valve body from front to back in the central cavity of the valve body. The front end of the valve rod 4 is fixed with the valve core screw 3 matched with the valve core 2 by the cylindrical pin 15. The rear end of the valve rod 4 is fixed with the handle 9 by the fixing screw 10. The handle 9 drives the valve rod 4 to move forward and backward and rotate.

[0062] The front interface of the valve body front part 1 matches with the interface of the vacuum box 16. The valve body middle section is provided with a side interface connected with the vacuum pump and a rotating boss. The opening pin 14 is arranged on the rotating boss. The limiting screw 13 is fixed on the opening pin 14 and rotates around the opening pin 14. The U-shaped slot matched with the limiting screw 13 is arranged on the handle 9. The limiting screw 13 is clamped into the U-shaped slot. The rear section of the limiting screw 13 is provided with two nuts 11. Each nut 11 moves forward and backward along the limiting screw 13 and then fixes and clamps the limiting screw 13 according to the position of the limiting screw 13 clamped into the U-shaped slot. The O-shaped sealing ring 12 is arranged between the valve body rear part 7 and the valve rod 4.

[0063] The valve core separation vacuum valve decouples the axial movement and the circumferential rotation of the valve rod 4. The axial movement of the valve rod 4 is compensated by the extension and contraction of the vacuum bellows 6. The static sealing is realized between the vacuum bellows 6 and the valve body by the KF sealing element 5. The circumferential fixed-point rotary dynamic sealing is realized between the valve rod 4 and the valve body by the O-shaped sealing ring 12. The vacuum sealing reliability of the valve core separation vacuum valve is improved.

[0064] Further, the valve rod 4 is provided with three shaft shoulders from rear to front. The first shaft shoulder is located at the connection between the handle 9 and the valve body rear cover 8, which is used to limit the forward movement of the handle 9. The second shaft shoulder is located at the interface between the valve body rear part 7 and the valve body rear cover 8, which is used to limit the rearward movement of the valve rod 4. The third shaft shoulder is located at a position determined according to the length of the valve rod 4 on the left side of the third shaft shoulder and the total length of the valve body front part 1 and the valve body middle section, so that the farthest position of the forward movement of the valve rod 4 is the front interface of the valve body front part 1.

[0065] like Figure 3 As shown, further, the connection part between the rear end of the valve stem 4 and the handle 9 is a waist-shaped rod, which matches the rectangular hole of the handle 9. The waist-shaped rod of the valve stem 4 is inserted into the rectangular hole of the handle 9 and fixed, so that the handle 9 drives the valve stem 4 to rotate.

[0066] Furthermore, the KF seal 5 includes a clamp and a vacuum sealing ring. The clamp clamps the adjacent sections, and the vacuum sealing ring realizes the sealing of the section interface.

[0067] Furthermore, a limit platform is provided in the interface of the vacuum box 16 to prevent the valve core 2 from entering the interior of the vacuum box 16; or a limit platform is not provided in the interface of the vacuum box 16, and the third axial shoulder of the valve stem 4 is used to limit the forward movement of the valve stem 4, so that the limit position of the forward movement of the valve stem 4 is the interface of the front part 1 of the valve body, ensuring that the valve core 2 and the valve stem 4 will not enter the inner cavity of the vacuum box 16; the limitation of the valve core 2 improves the compatibility and safety stability of the valve core separation vacuum valve.

[0068] The method of using the valve core separation vacuum valve for plug removal and vacuuming in this embodiment includes serving as a switch for the vacuum box 16 and performing vacuuming of the vacuum box 16;

[0069] The switch of the vacuum box 16 has a closed state and an open state:

[0070] like Figure 4 As shown, in the closed state, the valve core 2 is placed in the interface of the vacuum box 16, the valve core screw 3 is screwed into the valve core 2, the air inlet of the vacuum box 16 and the air inlet of the vacuum pump are closed, the limiting screw 13 is clamped into the U-shaped groove of the handle 9, and the two nuts 11 clamp the limiting screw 13;

[0071] like Figure 5 As shown, in the open state, based on the closed state, the limiting screw 13 leaves the handle 9, the handle 9 pulls the valve core 2 backward, and the valve core 2 is placed in the middle section of the valve body, and the air inlet of the vacuum box 16 and the air inlet of the vacuum pump are opened;

[0072] The vacuum box 16 is evacuated, comprising the following steps:

[0073] S10. Connect the valve core to separate the vacuum valve;

[0074] like Figure 6 As shown, the valve core 2 is placed in the interface of the vacuum box 16; the interface of the vacuum box 16 is connected to the front interface of the valve body front part 1 using the KF seal 5, and the side interface is connected to the vacuum pump; the handle 9 is in the initial position;

[0075] S20. Close the valve core to separate the vacuum valve;

[0076] like Figure 7As shown, loosen the two nuts 11 on the limiting screw 13, and the limiting screw 13 rotates clockwise around the cotter pin 14 and leaves the handle 9; the handle 9 drives the valve stem 4 to move forward, and the handle 9 rotates forward, the valve core screw 3 is screwed into the valve core 2, and the air inlet of the vacuum box 16 and the air inlet of the vacuum pump are closed;

[0077] S30. Open the valve core to separate the vacuum valve;

[0078] like Figure 8 As shown, pull the handle 9 backward, the valve stem 4 pulls the valve core 2 out of the interface of the vacuum box 16, the valve core 2 enters the middle section of the valve body, and the air inlet of the vacuum box 16 and the air inlet of the vacuum pump are opened;

[0079] S40. Vacuuming;

[0080] like Figure 9 As shown, the limiting screw 13 rotates clockwise around the cotter pin 14, and the limiting screw 13 is clamped into the U-shaped groove of the handle 9. The positions of the two nuts 11 are adjusted, and the two nuts 11 clamp the limiting screw 13, locking the valve core to separate the vacuum valve; turn on the vacuum pump and evacuate the vacuum box 16;

[0081] S50. Release the valve core separation vacuum valve lock;

[0082] After vacuuming is completed, turn off the vacuum pump; Figure 10 As shown, loosen the two nuts 11, and the limiting screw 13 rotates clockwise around the cotter pin 14, leaving the handle 9, releasing the valve core separation vacuum valve lock;

[0083] S60 sealed vacuum box 16;

[0084] like Figure 11 As shown, push the handle 9 forward, the valve stem 4 drives the lower valve core 2 to insert into the interface of the vacuum box 16, and is clamped by the sealing ring around the valve core 2; rotate the handle 9 in the opposite direction to separate the valve core screw 3 of the valve stem 4 from the valve core 2; the valve core 2 remains in the interface of the vacuum box 16, sealing the vacuum box 16;

[0085] S70. Lock the valve core to separate the vacuum valve;

[0086] like Figure 12 As shown, pull the handle 9 backward to withdraw the valve stem 4 from the interface of the vacuum box 16 to the initial position; the limiting screw 13 rotates counterclockwise around the cotter pin 14, and the limiting screw 13 is clamped into the U-shaped groove of the handle 9. The position of the two nuts 11 is adjusted, and the two nuts 11 clamp the limiting screw 13, locking the valve core to separate the vacuum valve;

[0087] S80. Remove the valve core to separate the vacuum valve;

[0088] like Figure 13As shown, the KF seal 5 at the joint between the interface of the vacuum box 16 and the front part 1 of the valve body is removed, and the KF seal 5 at the joint between the side interface and the vacuum pump is removed; the vacuum box 16, the vacuum pump and the valve core for the plug-pulling vacuum operation are separated, and are respectively arranged, and the vacuum box 16 is completed to be vacuumized.

[0089] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A valve core separation vacuum valve for use in a plug unseating vacuum operation, characterized by, The valve core separation vacuum valve comprises a valve body and a valve core (2) separated from the valve body; the valve core (2) is arranged in the interface of a vacuum box (16) around a sealing ring; The valve body is a pipe body, and sequentially comprises a valve body front part (1), a valve body middle part, a vacuum bellows (6), a valve body rear part (7), a valve body rear cover (8) and a handle (9) from front to back; the valve body middle part, the vacuum bellows (6) and the valve body rear part (7) are sealed by a KF sealing element (5); a valve rod (4) penetrates the central cavity of the valve body from front to back; the front end of the valve rod (4) is fixed by a cylindrical pin (15) and a valve core screw (3) matched with the valve core (2); the rear end of the valve rod (4) is fixed by a fixing screw (10) and the handle (9); the handle (9) drives the valve rod (4) to move forward and backward and rotate. The front interface of the valve body front part (1) is matched with the interface of the vacuum box (16); the valve body middle part is provided with a side interface connected with a vacuum pump and a rotating boss; an open pin (14) is arranged on the rotating boss; a limiting screw rod (13) is fixed on the open pin (14) and rotates around the open pin (14); the handle (9) is provided with a U-shaped groove matched with the limiting screw rod (13); the limiting screw rod (13) is clamped into the U-shaped groove; two nuts (11) are arranged on the rear part of the limiting screw rod (13); each nut (11) is moved forward and backward along the limiting screw rod (13) and then fixed and clamped to the limiting screw rod (13) according to the position of the limiting screw rod (13) clamped into the U-shaped groove; an O-shaped sealing ring (12) is arranged between the valve body rear part (7) and the valve rod (4). The valve core separation vacuum valve decouples the axial movement and the circumferential rotation of the valve rod (4); the axial movement of the valve rod (4) is compensated by the vacuum bellows (6); the vacuum bellows (6) and the valve body are sealed by the KF sealing element (5); the circumferential fixed-point rotation of the valve rod (4) is sealed by the O-shaped sealing ring (12); and the vacuum sealing reliability of the valve core separation vacuum valve is improved.

2. The poppet separation vacuum valve for a plug unvaccumizing operation according to claim 1, characterized by, The valve rod (4) is provided with three shaft shoulders from rear to front; the first shaft shoulder is located at the connection between the handle (9) and the valve body rear cover (8) and is used for limiting the forward movement of the handle (9); the second shaft shoulder is located at the interface between the valve body rear part (7) and the valve body rear cover (8) and is used for limiting the rearward movement of the valve rod (4); the third shaft shoulder is located at a position same as the length of the valve rod (4) on the left side of the third shaft shoulder and the total length of the valve body front part (1) and the valve body middle part, so that the farthest forward movement position of the valve rod (4) is the front interface of the valve body front part (1).

3. The poppet separation vacuum valve for a plug unvaccuming operation according to claim 1, characterized by, The rear end of the valve rod (4) and the handle (9) are connected by a waist-shaped rod matched with a rectangular hole of the handle (9); the waist-shaped rod of the valve rod (4) is inserted into the rectangular hole of the handle (9) to be fixed, so that the handle (9) drives the valve rod (4) to rotate.

4. The poppet-separation vacuum valve for a plug-pulling vacuumizing operation according to claim 1, characterized by The KF sealing element (5) comprises a clamp and a vacuum sealing ring; the clamp clamps adjacent sections; and the vacuum sealing ring seals the section interface.

5. The poppet-separation vacuum valve for a plug-pulling vacuumizing operation according to claim 2, wherein The interface of the vacuum box (16) is provided with a limiting table to prevent the valve core (2) from entering the interior of the vacuum box (16); or the interface of the vacuum box (16) is not provided with a limiting table, and the third shaft shoulder of the valve rod (4) is used to limit the forward movement of the valve rod (4), so that the limit position of the forward movement of the valve rod (4) is the interface of the front part of the valve body (1), and it is ensured that the valve core (2) and the valve rod (4) cannot enter the inner cavity of the vacuum box (16).

6. A method for using the valve core separation vacuum valve for the plug unseating vacuum operation, for the valve core separation vacuum valve for the plug unseating vacuum operation according to claim 3, characterized in that, The use method comprises the following steps: The use method comprises the following steps: The use method comprises the following steps: In the closed state, the valve core (2) is arranged in the interface of the vacuum box (16), the valve core screw (3) is screwed into the valve core (2), the air inlet of the vacuum box (16) and the air inlet of the vacuum pump are closed, the limiting screw rod (13) is clamped into the U-shaped groove of the handle (9), and the two nuts (11) clamp the limiting screw rod (13); In the open state, on the basis of the closed state, the limiting screw rod (13) is away from the handle (9), the handle (9) pulls the valve core (2) backward, and the valve core (2) is arranged in the middle section of the valve body, and the air inlet of the vacuum box (16) and the air inlet of the vacuum pump are opened; The use method comprises the following steps: S10. Connect the valve core separation vacuum valve; The valve core (2) is arranged in the interface of the vacuum box (16); the interface of the vacuum box (16) is connected with the front interface of the front part of the valve body (1) by using the KF sealing element (5), the side interface is connected with the vacuum pump; and the handle (9) is located at an initial position; S20. Close the valve core separation vacuum valve; The two nuts (11) on the limiting screw rod (13) are loosened, the limiting screw rod (13) rotates clockwise around the split pin (14) and is away from the handle (9); the handle (9) drives the valve rod (4) to move forward, the handle (9) is rotated in a forward direction, the valve core screw (3) is screwed into the valve core (2), and the air inlet of the vacuum box (16) and the air inlet of the vacuum pump are closed; S30. Open the valve core separation vacuum valve; The handle (9) is pulled backward, the valve rod (4) pulls out the valve core (2) from the interface of the vacuum box (16), the valve core (2) enters the middle section of the valve body, and the air inlet of the vacuum box (16) and the air inlet of the vacuum pump are opened; S40. Vacuumize; The limiting screw rod (13) rotates clockwise around the split pin (14), the limiting screw rod (13) is clamped into the U-shaped groove of the handle (9), the positions of the two nuts (11) are adjusted, the two nuts (11) clamp the limiting screw rod (13), the valve core separation vacuum valve is locked, and the vacuum pump is opened to vacuumize the vacuum box (16); S50. Release the locking of the valve core separation vacuum valve; After the vacuumization is completed, the vacuum pump is closed; the two nuts (11) are loosened, the limiting screw rod (13) rotates clockwise around the split pin (14) and is away from the handle (9), and the locking of the valve core separation vacuum valve is released; S60. Seal the vacuum box (16); Push the handle (9) forward, the valve stem (4) drives the lower valve core (2) to insert into the interface of the vacuum box (16), and is clamped under the action of the sealing ring around the valve core (2); reverse rotation of the handle (9) makes the valve core screw (3) of the valve stem (4) separate from the valve core (2); the valve core (2) remains in the interface of the vacuum box (16) to seal the vacuum box (16); S70. Locking the valve core separation vacuum valve; Pull the handle (9) backward to make the valve stem (4) exit the interface of the vacuum box (16) to reach the initial position; the limit screw (13) rotates counterclockwise around the cotter pin (14), the limit screw (13) is clamped into the U-shaped slot of the handle (9), the positions of the two nuts (11) are adjusted, the two nuts (11) clamp the limit screw (13), and the valve core separation vacuum valve is locked; S80. Disassembling the valve core separation vacuum valve; Remove the KF sealing element (5) at the connection between the interface of the vacuum box (16) and the front part (1) of the valve body, and remove the KF sealing element (5) at the connection between the side interface and the vacuum pump; separate the vacuum box (16), the vacuum pump and the valve core separation vacuum valve used for plug pulling and vacuumizing operation, and place them respectively to complete the vacuumizing of the vacuum box (16).

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