Leakage-free two-way shutoff valve

Abstract

The utility model discloses a liquid-leakage-free two-way shutoff valve which comprises a connecting sleeve provided with a locking device, an upper shell assembly connected with the locking device in a clamped mode and a lower shell assembly connected with the connecting sleeve in a sleeved mode, an upper valve element is elastically arranged in the upper shell assembly, a first sealing ring is arranged on the upper valve element, and a second sealing ring is arranged on the lower shell assembly. An ejector rod and an elastically-arranged lower valve element are arranged in the lower shell assembly, and a second sealing ring is arranged on the ejector rod. The upper shell assembly is arranged to extrude the lower shell assembly, and the ejector rod abuts against the upper valve element, so that connection and through are achieved, and meanwhile no gap is reserved between the ejector rod and the upper valve element in abutting connection; and during disassembly, automatic ejection is realized by utilizing the elastic force of the elastic connecting piece, and meanwhile, the sealing ring is used for synchronously sealing the communicated position, so that the purpose of no leakage during disassembly is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a non-leakage bidirectional shut-off valve. Background Art

[0002] At present, two-way shutoff connection devices have not been widely used in automobile pipeline systems, resulting in the need to drain the medium in the pipeline before pipeline maintenance or replacement to avoid medium leakage during pipeline disassembly, resulting in waste or environmental pollution. Although a variety of two-way shutoff valves have been used, they can only reduce leakage, and there is still a problem of small amount of medium leakage during pipeline disassembly. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a non-leakage two-way shut-off valve which can ensure sealing performance in use and prevent medium leakage during the disassembly process.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a leakage-free two-way shut-off valve, including a connecting sleeve provided with a lock, an upper shell assembly clamped with the lock, and a lower shell assembly sleeved with the connecting sleeve, an upper valve core is elastically provided in the upper shell assembly, a first sealing ring is provided on the upper valve core, a push rod and an elastically provided lower valve core are provided in the lower shell assembly, and a second sealing ring is provided on the push rod; when in use, the upper shell assembly squeezes the lower valve core, and the push rod pushes out the upper valve core, the upper shell assembly and the lower shell assembly are connected, and the upper shell assembly is clamped by the lock to limit the position; when disassembling, the lock is released, and under the action of elastic force, the upper valve core pushes the push rod back, the liquid outlet end of the upper shell assembly is sealed with the first sealing ring, and the second sealing ring is sealed with the liquid outlet end of the lower shell assembly.

[0005] By adopting the above structure, the lower valve core is squeezed by the upper shell assembly, and the push rod is used to push the upper valve core upward, so that the upper shell assembly and the lower shell assembly are connected, and at this time the upper shell assembly is clamped and limited by the lock, and the medium flows in the through position; when disassembling, the lock is released, the upper shell assembly is no longer clamped and limited, and under the elastic force of the elastic connecting piece, the upper valve core pushes back the push rod. During this process, the upper valve core and the push rod are always kept in abutment state, and there is no gap with residual medium. At the same time, the liquid outlet end of the upper shell assembly is sealed with the first sealing ring, and the second sealing ring is sealed with the liquid outlet end of the lower shell assembly, that is, when the upper shell assembly is pulled off the connecting sleeve, there will be no medium leakage. The structure is simple and compact, and the operation is convenient.

[0006] In order to simplify the structure and facilitate installation, preferably, a step hole is provided in the connecting sleeve, and a guide top ring is provided in the large hole end of the step hole. An insertion hole with a guide block is provided on one side of the connecting sleeve at the large hole end position corresponding to the step hole, and two upper limit holes are connected at the upper end of the other side, and two lower limit holes are connected at the lower end. The two upper limit holes and the lower limit holes are symmetrically arranged on the left and right; a yield hole is provided on the guide top ring, which is connected to the insertion hole, the upper limit hole and the lower limit hole; the lock includes a push plate, and a first clamping strip and a second clamping strip are provided at the upper end of the push plate, and a first positioning rod and a second positioning rod are provided at the lower end of the push plate, the two clamping strips extend into the guide top ring through the yielding holes, and the corresponding position on each clamping strip extends into the upper limit hole at the corresponding end, the two positioning rods extend into the guide top ring through the yielding holes, and the corresponding positions on the two positioning rods are engaged and positioned with the lower limit holes at the corresponding ends.

[0007] In order to simplify the structure and facilitate limiting, preferably, two clearance grooves are symmetrically provided on the left and right sides of the guide block, a baffle is provided at the position of the guide block in the clearance hole, and notches are provided at the positions of the baffle corresponding to the clearance grooves. The lower end surface of the notch is flush with the lower end groove wall of the clearance groove. When in use, the two clamping strips extend into the guide top ring through the clearance grooves and the notch in turn.

[0008] In order to simplify the structure and facilitate limiting, preferably, the first clamping strip and the second clamping strip both extend horizontally from the upper end of the push plate, and two stoppers are symmetrically provided on the two clamping strips, and the two stoppers extend into the upper limit holes at the corresponding ends.

[0009] In order to simplify the structure and facilitate limiting, preferably, the first positioning rod and the second positioning rod both extend horizontally from the lower end of the push plate, the extended end of each positioning rod extends into the lower limit hole and is provided with a bending section, each positioning rod is provided with a protrusion, and the upper end face of each protrusion is provided with a second transition slope, the bending sections, the protrusions and the corresponding positions of the positioning rods at the corresponding ends are combined to form a slot; positioning protrusions are provided in the two lower limit holes, and the slots at the corresponding ends are engaged with the positioning protrusions for positioning.

[0010] In order to improve the stability of the connection limit, preferably, the upper shell assembly includes a male plug sleeve and a male plug tube, a placement hole is axially penetrated on the male plug sleeve, a limiting boss is provided at one end of the outer side of the male plug sleeve, a limiting groove is provided at the other end, and an embedding groove is circumferentially arranged on the end face of one end of the male plug tube; an arc surface is provided on the inner side walls of the two clamping strips, and the two arc surfaces form a semi-circular arc shape; during installation, one end of the male plug sleeve is extended into the embedding groove, and the end face of the sleeve end of the male plug tube is abutted against the outer wall of the corresponding end of the limiting boss for limiting, and when the male plug sleeve is extended into the guide top ring, the arc surfaces on the two clamping strips are both in contact with the groove wall of the limiting groove, so that the locking device can limit the male plug sleeve.

[0011] In order to ensure the unlocking and sealing synchronization of the first sealing ring, preferably, the upper shell assembly also includes a first compression spring arranged in the placement hole, one end of the first compression spring is fixedly connected to the male plug tube, and the other end is fixedly connected to the upper valve core, and a first sealing ring is embedded in the outer wall of the upper valve core, and the outer wall of the first sealing ring is in contact with the hole wall of the placement hole.

[0012] In order to facilitate the limiting of the upper valve core and avoid the first sealing ring being exposed and affecting the sealing effect, preferably, a first transition slope is provided around the outer wall of the upper valve core, and a limiting slope is provided on the hole wall of the placement hole at a position corresponding to the first transition slope. The limiting slope is in contact with the first transition slope, and the end face of the non-connecting end of the upper valve core is made flush with the end face of the hole opening corresponding to the placement hole.

[0013] In order to ensure the synchronization of unlocking and sealing of the second sealing ring, preferably, the lower shell assembly also includes a female plug sleeve that is connected to the connecting sleeve, and a push rod that extends into the small hole end of the step hole is fixed in the female plug sleeve, and the extended end of the push rod is sleeved in the directional hole of the lower valve core, and a second compression spring is also sleeved on the outside of the push rod, and a positioning groove is provided on one side of the lower valve core along the circumferential direction, one end of the second compression spring extends into the positioning groove and abuts against the bottom of the groove, and the other end abuts against the inner side wall of the female plug sleeve; a second sealing ring is embedded on the outer side wall of the push rod, and the outer side wall of the second sealing ring fits and abuts against the inner side wall of the directional hole.

[0014] In order to facilitate the limiting of the lower valve core and avoid the second sealing ring being exposed and affecting the sealing effect, preferably, a positioning boss extending inward is arranged on the hole wall at the small hole end of the step hole, a first positioning inclined surface is arranged on the outer side of the positioning boss, a second positioning inclined surface is arranged on the inner side of the positioning boss, and a section of a yielding inclined surface which is fitted with the second positioning inclined surface for limiting the position is provided on the outer side of the lower valve core; an upper sealing ring and a lower sealing ring are sleeved on the outer side of the lower valve core, the outer side walls of the upper sealing ring and the lower sealing ring are both in contact with the hole wall at the small hole end of the step hole, and the upper end face of the upper sealing ring is in contact with the lower end face of the guide top ring, and the lower end face of the lower sealing ring is in contact with the first positioning inclined surface; an isolation ring sleeved on the outer side of the lower valve core is also provided between the upper sealing ring and the lower sealing ring.

[0015] Beneficial effects: The utility model arranges an upper shell component to squeeze the lower shell component, and uses a push rod to abut against the upper valve core, so that the connection is achieved while there is no gap between the push rod and the upper valve core; when disassembling, the elastic force of the elastic connector is used to achieve automatic pop-up, and at the same time, the sealing ring is used to synchronously seal the connecting position, so as to achieve the purpose of disassembly without leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is an exploded view of the utility model.

[0018] Figure 2 This is a schematic diagram of the assembly structure of the utility model before connection.

[0019] Figure 3 It is a schematic diagram of the structure of the male plug tube.

[0020] Figure 4 It is a schematic diagram of the structure of the male plug sleeve.

[0021] Figure 5 Schematic diagram of the structure of the guide top ring.

[0022] Figure 6 It is a structural schematic diagram of the upper valve core.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the connecting sleeve.

[0024] Figure 8 Schematic diagram of the internal structure of the connecting sleeve.

[0025] Fig. 9 A schematic diagram of the structure of the lock.

[0026] Fig.10 It is a structural schematic diagram of the lower valve core.

[0027] Fig.11 It is a three-dimensional structural schematic diagram of the female plug sleeve and the ejector rod.

[0028] Fig.12 It is a schematic diagram of the use state of the utility model.

[0029] The meanings of the symbols in the accompanying drawings are:

[0030] Connecting sleeve-1; step hole-10; guide top ring-11; baffle-111; notch-112; insertion hole-12; guide block-121; clearance groove-122; upper limit hole-13; lower limit hole-14; clearance hole-15; positioning protrusion-16; positioning boss-17; first positioning inclined surface-171; second positioning inclined surface-172;

[0031] Upper valve core-2; first sealing ring-20; first transition slope-21; push plate-3; first clamping strip-31; second clamping strip-32; first positioning rod-33; second positioning rod-34; stopper-35;

[0032] Male plug sleeve-4; male plug tube-40; placement hole-401; embedding groove-402; limiting inclined surface-403; limiting boss-41; limiting groove-42;

[0033] Lower valve core-5; push rod-50; second sealing ring-51; bending section-52; second transition slope-53; yield slope-54; positioning groove-55; directional hole-56;

[0034] The first compression spring 61; the second compression spring 62; the upper sealing ring 63; the lower sealing ring 64; the female plug sleeve 7; and the isolation ring 8. DETAILED DESCRIPTION

[0035] Depend on Figures 1 to 12 As shown, the utility model includes a connecting sleeve 1 provided with a lock, an upper shell assembly clamped with the lock, and a lower shell assembly sleeved with the connecting sleeve 1, an upper valve core 2 is elastically provided in the upper shell assembly, a first sealing ring 20 is provided on the upper valve core 2, a push rod 50 and an elastically provided lower valve core 5 are provided in the lower shell assembly, and a second sealing ring 51 is provided on the push rod 50; when in use, the upper shell assembly squeezes the lower valve core 5, and the push rod 50 pushes out the upper valve core 2, the upper shell assembly and the lower shell assembly are connected, and the upper shell assembly is clamped by the lock to limit; when disassembling, the lock is released, and under the action of elastic force, the upper valve core 2 pushes back the push rod 50, the liquid outlet end of the upper shell assembly is sealed with the first sealing ring 20, and the second sealing ring 51 is sealed with the liquid outlet end of the lower shell assembly.

[0036] Specifically, a step hole 10 is provided in the connecting sleeve 1, a guide top ring 11 is provided in the large hole end of the step hole 10, an insertion hole 12 with a guide block 121 is provided on one side of the connecting sleeve 1 corresponding to the large hole end position of the step hole 10, and two upper limit holes 13 are connected at the upper end of the other side, and two lower limit holes 14 are connected at the lower end, and the two upper limit holes 13 and the lower limit holes 14 are symmetrically arranged on the left and right; a clearance hole 1 is provided on the guide top ring 11, which is connected to the insertion hole 12, the upper limit hole 13 and the lower limit hole 14. 5; The lock includes a push plate 3, at the upper end of which a first clamping strip 31 and a second clamping strip 32 are horizontally extended, and at the lower end of which a first positioning rod 33 and a second positioning rod 34 are horizontally extended, and two stoppers 35 are symmetrically provided on the two clamping strips, and the two clamping strips extend into the guide top ring 11 through the clearance holes 15, and the two stoppers 35 extend into the upper limit holes 13 at the corresponding ends, and the two positioning rods extend into the guide top ring 11 through the clearance holes 15, and the corresponding positions on the two positioning rods are engaged and positioned with the lower limit holes 14 at the corresponding ends.

[0037] Two clearance grooves 122 are symmetrically arranged on the left and right sides of the guide block 121, a baffle 111 is arranged at the position of the clearance hole 15 corresponding to the guide block 121, and a notch 112 is arranged at the position of the baffle 111 corresponding to the clearance groove 122, and the lower end surface of the notch 112 is flush with the lower end groove wall of the clearance groove 122. When in use, the two clamping strips extend into the guide top ring 11 through the clearance groove 122 and the notch 112 in turn.

[0038] The first positioning rod 33 and the second positioning rod 34 both extend horizontally from the lower end of the push plate 3, the extended end of each positioning rod extends into the lower limit hole 14 and is provided with a bending section 52, each positioning rod is provided with a protrusion, and the upper end surface of each protrusion is provided with a second transition slope 53, the bending section 52 at the corresponding end, the protrusion and the corresponding position of the positioning rod are combined to form a slot; positioning protrusions 16 are provided in the two lower limit holes 14, and the slots at the corresponding ends are engaged with the positioning protrusions 16 for positioning.

[0039] The upper shell assembly includes a male plug sleeve 4 and a male plug tube 40, wherein a placement hole 401 is axially provided on the male plug sleeve 4, a limiting boss 41 is provided at one end of the outer side of the male plug sleeve 4, and a limiting groove 42 is provided at the other end, and an embedding groove 402 is provided on the end face of one end of the male plug tube 40 in a circumferential direction; a section of arc surface is provided on the inner side walls of the two clamping strips, and the two sections of the arc surface form a semi-circular arc shape; during installation, one end of the male plug sleeve 4 extends into the embedding groove 402, and the end face of the sleeve end of the male plug tube 40 abuts against the outer wall of the corresponding end of the limiting boss 41 for limiting, and when the male plug sleeve 4 extends into the guide top ring 11, the arc surfaces on the two clamping strips are both in contact with the groove wall of the limiting groove 42, so that the locking device can lock and limit the male plug sleeve 4.

[0040] The upper shell assembly also includes a first compression spring 61 arranged in the placement hole 401, one end of the first compression spring 61 is fixedly connected to the male plug tube 40, and the other end is fixedly connected to the upper valve core 2, and a first sealing ring 20 is embedded in the outer wall of the upper valve core 2, and the outer wall of the first sealing ring 20 is in close contact with the hole wall of the placement hole 401; a first transition slope 21 is arranged around the outer wall of the upper valve core 2, and a limiting slope 403 is provided at a position corresponding to the first transition slope 21 on the hole wall of the placement hole 401, and the limiting slope 403 is in close contact with the first transition slope 21, and the end face of the non-connection end of the upper valve core 2 is made flush with the end face of the hole mouth corresponding to the placement hole 401.

[0041] The lower shell assembly also includes a female plug sleeve 7 which is connected and sleeved on the connecting sleeve 1. A push rod 50 is fixedly provided in the female plug sleeve 7 and extends into the small hole end of the step hole 10. The extended end of the push rod 50 is sleeved in the directional hole 56 of the lower valve core 5. A second compression spring 62 is also sleeved on the outer side of the push rod 50. A positioning groove 55 is circumferentially arranged on one side of the lower valve core 5. One end of the second compression spring 62 extends into the positioning groove 55 and abuts against the bottom of the groove, and the other end abuts against the inner side wall of the female plug sleeve 7. A second sealing ring 51 is embedded on the outer side wall of the push rod 50, and the outer side wall of the second sealing ring 51 fits and abuts against the inner side wall of the directional hole 56.

[0042] A positioning boss 17 extending inward is arranged around the hole wall of the small hole end of the step hole 10, a first positioning inclined surface 171 is arranged on the outer side of the positioning boss 17, a second positioning inclined surface 172 is arranged on the inner side of the positioning boss 17, and a yielding inclined surface 57 which is fitted and limited with the second positioning inclined surface 172 is arranged on the outer side of the lower valve core 5; an upper sealing ring 63 and a lower sealing ring 64 are sleeved on the outer side of the lower valve core 5, the outer side walls of the upper sealing ring 63 and the lower sealing ring 64 are both in contact with the hole wall of the small hole end of the step hole 10, and the upper end face of the upper sealing ring 63 is in contact with the lower end face of the guide top ring 11, and the lower end face of the lower sealing ring 64 is in contact with the first positioning inclined surface 171; an isolation ring 8 sleeved on the outer side of the lower valve core 5 is also arranged between the upper sealing ring 63 and the lower sealing ring 64.

[0043] The operating principle of the utility model is as follows:

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, before use, first, one end of the male plug sleeve 4 is extended into the embedding groove 402, and the end face of the sleeve end of the male plug tube 40 is abutted against the outer wall of the corresponding end of the limiting boss 41 for limiting. In addition, one end of the first compression spring 61 is fixedly connected to the male plug tube 40, and the other end is fixedly connected to the upper valve core 2. A first sealing ring 20 is embedded in the outer side wall of the upper valve core 2, and the outer side wall of the first sealing ring 20 is abutted against the hole wall of the placement hole 401; at the same time, the limiting inclined surface 403 is abutted against the first transition inclined surface 21, and the end face of the non-connecting end of the upper valve core 2 is flush with the hole mouth end face of the corresponding end of the placement hole 401.

[0045] Then, if Figure 1 , Figure 2 , Fig.10 and Fig.11 As shown, the female plug sleeve 7 is connected to the connecting sleeve 1, one end of the second compression spring 62 is extended into the positioning groove 55 and abuts against the bottom of the groove, and the other end abuts against the inner wall of the female plug sleeve 7, the second positioning inclined surface 172 fits the limiting yielding inclined surface 54, the outer side walls of the upper sealing ring 63 and the lower sealing ring 64 are both abutted against the hole wall of the small hole end of the step hole 10, and the upper end face of the upper sealing ring 63 abuts against the lower end face of the guide top ring 11, and the lower end face of the lower sealing ring 64 abuts against the first positioning inclined surface 171. At the same time, the outer side wall of the second sealing ring 51 fits and abuts against the inner side wall of the directional hole 56.

[0046] Then, if Figure 1 , Figure 2 , Figure 5 , Figures 7 to 9As shown, the locker is pushed into the insertion hole 12 of the connecting sleeve 1, and the first clamping strip 31 and the second clamping strip 32 are successively extended into the guide top ring 11 through the clearance groove 122 and the notch 112, and the two stoppers 35 are extended into the upper limit holes 13 at the corresponding ends; at this time, the first positioning rod 33 and the second positioning rod 34 are extended into the guide top ring 11 through the insertion hole 12 and the clearance hole 15, and the bending section 52 at the corresponding end, the protrusion and the corresponding position of the positioning rod are surrounded to form a clamping groove.

[0047] When using, Figure 1 , Figure 2 and Fig.12 As shown, the male plug sleeve 4 extends into the guide top ring 11, and the inserted end of the male plug sleeve 4 first squeezes the second transition inclined surface 53, so that the first positioning rod 33 and the second positioning rod 34 are expanded to the left and right sides, and abut against the upper end surface of the lower valve core 5. At the same time, the bent section 52 of the corresponding end overlaps the positioning protrusion 16, and the upper end surface of the push rod 50 abuts against the lower end surface of the upper valve core 2; the male plug sleeve 4 continues to extend, driving the lower valve core 5 to squeeze the second compression spring 62. At this time, the push rod 50 fixed in the female plug sleeve 7 forms a relative movement to push the upper valve core 2 upward. As the male plug sleeve 4 is extended, the push rod 50 leaves the directional hole 56 and enters the placement hole 401, and the first compression spring 61 is squeezed. At this time, the placement hole 401 is connected with the directional hole 56, and the medium can flow smoothly; because the lower end surface of the male plug sleeve 4 is always abutted against the upper end surface of the lower valve core 5 during the movement, the medium will not leak out at this time.

[0048] As the male plug sleeve 4 continues to extend, the locker is pushed in. When the arc surfaces on the two clamping strips are in contact with the groove walls of the limiting groove 42, the two bent sections 52 on the two unfolded positioning rods simultaneously leave the positioning protrusions 16 at the corresponding ends. Then, the clamping grooves on the two positioning rods are engaged and positioned with the positioning protrusions 16 at the corresponding ends, thereby realizing the locking and limiting of the male plug sleeve 4 by the locker.

[0049] When disassembling, first press the male plug sleeve 4, then open the two positioning rods to disengage the slot and the positioning protrusion 16, pull out the lock, and the stopper 35 moves to a limit in the upper limit hole 13 to prevent the lock from falling off; then, slowly loosen the male plug sleeve 4, and under the elastic force of the second compression spring 62, push the lower valve core 5 to push out the male plug sleeve 4. At the same time, the first compression spring 61 also drives the upper valve core 2 to abut against the push rod 50. As the lower valve core 5 moves upward, the second sealing ring 51 returns to the directional hole 56, and the outer wall of the second sealing ring 51 is in contact with the inner wall of the directional hole 56; at the same time, the outer wall of the first sealing ring 20 is in contact with the hole wall of the placement hole 401. During the whole process, the upper valve core 2 and the push rod 50 remain in contact.

[0050] Due to the fit and limitation between the first transition slope 21 and the limiting slope 403, the placement hole 401 will not appear in the upper valve core 2, that is, the first sealing ring 20 and the second sealing ring 51 are both in a built-in sealing state with good sealing stability. In this way, when the upper valve core 2 is separated from the push rod 50, no medium residue or leakage will occur.

[0051] It should be noted that, in order to better ensure the sealing performance, a fourth sealing ring 65 (such as Figure 1 , Figure 2 and Fig.12 As shown), it can not only avoid residual leakage during disassembly, but also form multiple seals without leakage during use.

Claims

1. A non-leakage two-way shut-off valve, characterized in that: The invention comprises a connecting sleeve (1) provided with a locker, an upper shell assembly clamped with the locker, and a lower shell assembly sleeved with the connecting sleeve (1); an upper valve core (2) is elastically provided in the upper shell assembly, a first sealing ring (20) is provided on the upper valve core (2), a push rod (50) and an elastically provided lower valve core (5) are provided in the lower shell assembly, and a second sealing ring (51) is provided on the push rod (50); when in use, the upper shell assembly squeezes the lower valve core (5) and causes the push rod (50) to push out the upper valve core (2), so that the upper shell assembly and the lower shell assembly are connected, and the upper shell assembly is clamped with the locker to limit the position; when disassembling, the locker is released, and under the action of the elastic force, the upper valve core (2) pushes back the push rod (50), the liquid outlet end of the upper shell assembly is sealed with the first sealing ring (20), and the second sealing ring (51) is sealed with the liquid outlet end of the lower shell assembly.

2. A liquid-free two-way shut-off valve according to claim 1, characterized in that: A step hole (10) is provided in the connecting sleeve (1), a guide top ring (11) is provided in the large hole end of the step hole (10), an insertion hole (12) with a guide block (121) is provided on one side of the connecting sleeve (1) at the large hole end position corresponding to the step hole (10), two upper limit holes (13) are connected at the upper end of the other side, and two lower limit holes (14) are connected at the lower end, and the two upper limit holes (13) and the lower limit holes (14) are both symmetrically arranged on the left and right; a guide top ring (11) is provided which is connected to the insertion hole (12), the upper limit hole (13) and the lower limit hole (14) are connected to the clearance holes (15); the lock includes a push plate (3), the upper end of the push plate (3) is provided with a first clamping strip (31) and a second clamping strip (32), the lower end of the push plate (3) is provided with a first positioning rod (33) and a second positioning rod (34), the two clamping strips extend into the guide top ring (11) through the clearance holes (15), and the corresponding position on each clamping strip extends into the upper limit hole (13) at the corresponding end, the two positioning rods extend into the guide top ring (11) through the clearance holes (15), and the corresponding positions on the two positioning rods are clamped and positioned with the lower limit holes (14) at the corresponding end.

3. A liquid-free two-way shut-off valve according to claim 2, characterized in that: Two clearance grooves (122) are symmetrically arranged on the left and right sides of the guide block (121); a baffle (111) is arranged at a position corresponding to the guide block (121) in the clearance hole (15); and notches (112) are arranged at positions corresponding to the clearance grooves (122) on the baffle (111); the lower end surface of the notch (112) is flush with the lower end groove wall of the clearance groove (122); when in use, the two clamping strips extend into the guide top ring (11) through the clearance grooves (122) and the notch (112) in sequence.

4. A liquid-free two-way shut-off valve according to claim 2, characterized in that: The first clamping strip (31) and the second clamping strip (32) both extend horizontally out of the upper end of the push plate (3), and two stoppers (35) are symmetrically arranged on the two clamping strips, and the two stoppers (35) extend into the upper limit holes (13) at the corresponding ends.

5. A liquid-free two-way shut-off valve according to claim 2, characterized in that: The first positioning rod (33) and the second positioning rod (34) both extend horizontally from the lower end of the push plate (3); the extended end of each positioning rod extends into the lower limit hole (14) and is provided with a bending section (52); each positioning rod is provided with a protrusion; the upper end surface of each protrusion is provided with a second transition slope (53); the bending section (52) at the corresponding end, the protrusion and the corresponding position of the positioning rod are combined to form a slot; positioning protrusions (16) are provided in the two lower limit holes (14), and the slots at the corresponding ends are engaged with the positioning protrusions (16) for positioning.

6. A liquid-free two-way shut-off valve according to claim 2, characterized in that: The upper shell assembly comprises a male plug sleeve (4) and a male plug tube (40); a placement hole (401) is axially provided on the male plug sleeve (4); a limiting boss (41) is provided on one end of the outer side of the male plug sleeve (4); a limiting groove (42) is provided on the other end; an embedding groove (402) is provided on the end surface of one end of the male plug tube (40) in a circumferential direction; a section of circular arc surface is provided on the inner side walls of the two clamping strips, and the two sections of circular arc surface form a semicircular arc shape; during installation, one end of the male plug sleeve (4) extends into the embedding groove (402), and the end surface of the sleeve end of the male plug tube (40) abuts against the outer wall of the corresponding end of the limiting boss (41) for limiting; when the male plug sleeve (4) extends into the guide top ring (11), the circular arc surfaces on the two clamping strips are both in contact with the groove wall of the limiting groove (42), so that the locking device can lock and limit the male plug sleeve (4).

7. A liquid-free two-way shut-off valve according to claim 6, characterized in that: The upper shell assembly also includes a first compression spring (61) arranged in the placement hole (401), one end of the first compression spring (61) is fixedly connected to the male plug tube (40), and the other end is fixedly connected to the upper valve core (2), and a first sealing ring (20) is embedded in the outer wall of the upper valve core (2), and the outer wall of the first sealing ring (20) is in close contact with the hole wall of the placement hole (401).

8. A liquid-free two-way shut-off valve according to claim 7, characterized in that: A first transition slope (21) is arranged around the outer wall of the upper valve core (2), and a limiting slope (403) is arranged on the hole wall of the placement hole (401) at a position corresponding to the first transition slope (21). The limiting slope (403) fits the first transition slope (21) and makes the end face of the non-connecting end of the upper valve core (2) flush with the end face of the hole opening corresponding to the placement hole (401).

9. A liquid-free two-way shut-off valve according to claim 2, characterized in that: The lower housing assembly also includes a female plug sleeve (7) which is connected and sleeved on the connecting sleeve (1). A push rod (50) is fixedly arranged in the female plug sleeve (7) and extends into the small hole end of the step hole (10). The extending end of the push rod (50) is sleeved in the directional hole (56) of the lower valve core (5). A second compression spring (62) is also sleeved on the outer side of the push rod (50). A positioning groove (55) is arranged around one side of the lower valve core (5) along the circumferential direction. One end of the second compression spring (62) extends into the positioning groove (55) and abuts against the bottom of the groove, and the other end abuts against the inner side wall of the female plug sleeve (7). A second sealing ring (51) is embedded on the outer side wall of the push rod (50), and the outer side wall of the second sealing ring (51) abuts against the inner side wall of the directional hole (56).

10. A liquid-free two-way shut-off valve according to claim 9, characterized in that: A positioning boss (17) extending inward is arranged around the hole wall of the small hole end of the step hole (10); a first positioning inclined surface (171) is arranged on the outer side of the positioning boss (17); a second positioning inclined surface (172) is arranged on the inner side of the positioning boss (17); a stop inclined surface (54) which is in contact with the second positioning inclined surface (172) and is limited in position is arranged on the outer side of the lower valve core (5); an upper sealing ring (63) is sleeved on the outer side of the lower valve core (5). and a lower sealing ring (64), the outer side walls of the upper sealing ring (63) and the lower sealing ring (64) are both in contact with the small hole end wall of the step hole (10), and the upper end face of the upper sealing ring (63) is in contact with the lower end face of the guide top ring (11), and the lower end face of the lower sealing ring (64) is in contact with the first positioning inclined surface (171); an isolation ring (8) is also provided between the upper sealing ring (63) and the lower sealing ring (64) and is sleeved on the outer side of the lower valve core (5).

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