CN114893582A - Flow control buffering discharge valve - Google Patents

Abstract

Flow control buffering drainage valve, including the direct pipe, the direct pipe outside cover is equipped with the locking swivel nut, and direct pipe and locking swivel nut below are connected with drainage valve subassembly, its characterized in that: the discharge valve component comprises a valve body, a rotary valve core arranged in the valve body and a switching handle for driving the rotary valve core to rotate; the rotary valve core comprises a spherical sealing body matched with the interior of the valve body and a connecting rod extending outwards from the side surface of the spherical sealing body to the exterior of the valve body, and the outer end of the connecting rod is connected with the switching handle; the spherical sealing body is provided with a through flow hole with the extending direction vertical to the extending direction of the connecting rod, and a discharging valve core is arranged in the through flow hole; the spherical seal body is close connecting rod one side and has been seted up buffering drainage runner, and the connecting rod has been seted up inside buffer valve core mounting hole with switching handle, and buffer valve core mounting hole runs through to communicating with buffering drainage runner by switching handle lateral surface, and buffer valve core mounting hole internally mounted has the buffering regulation subassembly.

Description

Flow control buffering discharge valve

Technical Field

The invention relates to the field of heat exchanger relief valve structures, in particular to a flow control buffering relief valve.

Background

The drainage valve is an indispensable device in a heat exchanger, and is mainly used for discharging gas and liquid, the existing drainage valve is too complex and inconvenient in structure, if liquid needs to be discharged, tools are needed, the valve cover and the valve core need to be removed, the liquid can be discharged, the flow direction of the liquid is not well controlled, the liquid can be sprayed everywhere, and unnecessary troubles are brought to operators; the manufacturing cost is relatively high due to the complicated structure. The prior discharge valve uses the same flow path for discharging gas and liquid, so that the discharge valve has the problems of too fast and unstable discharge gas, too slow discharge liquid, low efficiency and the like. In addition, when the pressure in the heat exchanger is too high, the conventional discharge valve is directly switched to a liquid discharge state or an exhaust state, so that high-temperature liquid or high-temperature liquid can be rapidly sprayed out under the action of high pressure, and potential safety hazards exist. Therefore, the discharge valve which has the advantages of simple structure, convenience in control, buffering function and different discharge diameters for gas and liquid is significant.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the flow control buffering discharge valve which is connected with a discharge valve component by adopting a transitional direct pipe and a locking threaded sleeve, has simple structure and convenient installation and replacement, and can adjust the position in the circumferential direction; the drainage valve subassembly is equipped with the change case, cushion drainage runner and buffering adjustment assembly, only need rotate the handle alright adjust the logical flow of change case, can adjust to the exhaust state of the flowing back state and the little logical flow of closed condition, buffering pressure release state, big logical flow to satisfy sealed, buffering pressure release, flowing back and carminative different demands respectively, make flowing back efficiency higher, it is more stable to exhaust, and can cushion the pressure release before the drainage, ensure to use safelyr.

The flow control buffering relief valve comprises a direct pipe, a locking threaded sleeve is sleeved outside the direct pipe, and a relief valve assembly is connected below the direct pipe and the locking threaded sleeve, and is characterized in that: the discharge valve assembly comprises a valve body, a rotary valve core arranged in the valve body and a switching handle for driving the rotary valve core to rotate; the rotary valve core comprises a spherical sealing body matched with the interior of the valve body and a connecting rod extending outwards from the side surface of the spherical sealing body to the exterior of the valve body, and the outer end of the connecting rod is connected with the switching handle; the spherical sealing body is provided with a through flow hole, the extending direction of which is vertical to the extending direction of the connecting rod, and a discharge valve core is arranged in the through flow hole; the spherical sealing body is provided with a buffer drainage flow channel on one side close to the connecting rod, buffer valve core mounting holes are formed in the connecting rod and the switching handle, the buffer valve core mounting holes penetrate through the outer side face of the switching handle and are communicated with the buffer drainage flow channel, and a buffer adjusting assembly is mounted in each buffer valve core mounting hole.

Therefore, the heat exchanger can be switched to the liquid drainage state and the gas exhaust state by the rotary valve core when liquid drainage and gas exhaust are carried out, so that the drainage valve is more stable when liquid drainage and gas exhaust are carried out; when the pressure in the heat exchanger is too high, the high-temperature liquid or the high-temperature liquid can be rapidly sprayed out under the action of high pressure by directly switching to a liquid discharge state or an exhaust state, so that potential safety hazards can be caused, the buffer discharge flow channel is adopted to release the pressure firstly, and the safety of the discharge valve can be improved; through rotating the switching handle, can make the spherical seal body is rotatory, realizes the switching of enclosed state, buffering pressure release state, flowing back state and exhaust state.

Preferably, the upper end of the direct pipe is provided with a thread for connection, the lower end of the direct pipe is provided with a blocking edge extending outwards, and the locking thread sleeve is sleeved at the rear lower end of the direct pipe and is limited and blocked by the blocking edge.

Therefore, the elbow pipe for discharging is led out of the outer wall of the shell of the heat exchanger, the outlet of the elbow pipe faces downwards, the inner hole is provided with the internal thread, the direct pipe is in threaded connection with the elbow pipe, the threads can be sealed through the thread seal tape, and the connection is simple and convenient.

Preferably, the lower part of the locking threaded sleeve is provided with an external thread, the inlet of the valve body is connected with the locking threaded sleeve through a thread, and the blocking edge at the lower end of the direct pipe is sealed with the valve body through a sealing gasket.

Therefore, the sealing gasket is arranged in the inlet of the valve body, and the sealing gasket is extruded between the blocking edge and the sealing surface of the valve body to realize sealing through the tight screwing of the threads between the valve body and the locking screw sleeve; in addition, the locking screw sleeve can be loosened to adjust the angle position of the switching handle, so that the operation is more smooth.

Preferably, the through-flow hole and the buffer drain flow passage are different by 30 ° to 60 ° in a circumferential direction of rotation of the rotary valve body.

The angle α of the through-opening and the buffer drain channel which differs in the rotational path thereby ensures that the through-opening and the buffer drain channel can be brought into a state in which one of the channels is open, the other channel is closed, and both channels are closed.

Preferably, one end of the relief valve core is a hollow inner through hole and is a cylinder with a U-shaped cross section, and the outer circle of the relief valve core is in clearance fit with the through hole.

Therefore, the extending direction of the through-flow hole can be adjusted by rotating the spherical sealing body, when two ends of the through-flow hole are adjusted to be abutted against the spherical inner wall of the valve body, sealing is formed between the spherical sealing body and the valve body, when two ends of the through-flow hole are adjusted to be opposed to the upper channel and the lower channel of the valve body, liquid or gas in the heat exchanger can be discharged from the through-flow hole; through installing drainage case, can reach different drainage throughflow when the through-flow hole two-way rotatory intercommunication to satisfy flowing back and exhaust better.

Preferably, a sealing chamfer is arranged between the end face of the closed end of the drainage valve core and the cylindrical surface, a sealing edge is arranged at one end of the sealing chamfer of the through-flow hole, and the sealing chamfer is sealed against the sealing edge; a flow groove is formed in one end of the sealing edge of the flow hole, and the diameter of the bottom of the flow groove is larger than the outer diameter of the drainage valve core; and a side through hole is formed in the position, opposite to the through flow groove, of the excircle of the discharging valve core, and the side through hole is used for communicating the inner through hole with the through flow groove.

Therefore, the sealing chamfer and the sealing edge are abutted to realize sealing; when the through-flow hole rotates to one end of the sealing edge and faces upwards, the drain valve core moves downwards, the drain valve core and the through-flow hole are not sealed any more, fluid enters the inner through hole from the through-flow groove through the side through hole to be drained, the through-flow rate is large, and the drainage device is suitable for draining fluid; when the through flow hole is rotated to one end of the sealing edge downwards, a seal is formed between the drainage valve core and the through flow hole to prevent drainage.

Preferably, a clamp spring groove is formed in one end, located at the inner through hole, of the through hole, a limit clamp spring is installed in the clamp spring groove, and at least half of the side through hole is located within the axial width range of the through hole when the discharging valve core moves to abut against the limit clamp spring.

The bleed valve element can thus be moved axially to effect a bidirectional switching between sealing and throughflow.

Preferably, the closed end surface of the relief valve core is provided with a relief small hole, and the relief small hole is communicated with the inner through hole.

Therefore, when the through flow hole is rotated to one end of the sealing edge to face downwards, the sealing is formed between the drain valve core and the through flow hole, most of fluid can only be drained from the drain small hole, the flow rate is small, and the exhaust is more suitable.

Preferably, the diameter of the small bleed hole is 0.5mm to 3 mm.

Therefore, the diameter of the small discharging hole is 0.5-3 mm, the small discharging hole is more suitable for exhausting air, the small discharging valve core can be replaced by detaching the limiting clamp spring, the valve core is simple and convenient, and the small discharging hole can be replaced by different discharging valve cores according to the exhaust requirement.

Preferably, the bottom of the cushion valve core mounting hole is provided with a sealing conical surface, and the cushion drainage flow passage penetrates through the sealing conical surface.

Therefore, high-pressure liquid or gas passes through the sealing conical surface in the process of passing through the buffer discharging flow passage, if the sealing conical surface is in a buffer pressure relief state under the action of the buffer adjusting assembly, the passage is blocked by a pressure-attached part, and higher pressure is required to jack the pressure of the buffer adjusting assembly, so that the high-pressure liquid or gas loses a part of pressure to be buffered.

Preferably, the buffer adjusting assembly comprises a buffer valve core, a buffer spring and an adjusting handle, the head of the buffer valve core is in a conical shape which is the same as the sealing conical surface, the buffer spring is arranged between the buffer valve core and the adjusting handle, and the inner end of the buffer spring is abutted against the tail of the buffer valve core.

Therefore, the buffer valve core is used for sealing the buffer valve core mounting hole, providing resistance of high-pressure liquid or gas, the buffer spring provides blocking force of the buffer valve core, and the elasticity of the buffer spring is adjusted through rotation of the adjusting handle, so that the buffer effect can be adjusted.

Preferably, the adjusting handle comprises an adjusting turntable part, an external thread part, a sealing part and a supporting part from outside to inside; an inward-sunken accommodating groove is formed in the outer side of the switching handle, and the adjusting turntable part is positioned in the accommodating groove; the orifice of the buffer valve core mounting hole is provided with an internal thread part, and the external thread part is matched with the internal thread part; and a grinding part is arranged at the joint of the inner part of the buffer valve core mounting hole and the internal thread part, and the sealing part is matched with the grinding part.

Therefore, the adjusting turntable part is positioned in the accommodating groove, the space occupied by the adjusting handle can be reduced, and the sealing part and the grinding part are matched to prevent the leakage of liquid or gas.

Preferably, a sealing element mounting groove is formed in the outer circumferential surface of the sealing portion, a sealing ring is mounted in the sealing element mounting groove, and the sealing rings are located in the range of the grinding portion in the rotation adjusting stroke of the adjusting turntable portion.

Therefore, the sealing ring is generally an O-shaped ring, and the surface roughness of the grinding part is generally less than Ra3.2, so that the sealing ring is ensured not to be damaged.

Preferably, when the adjusting turntable part is rotated to the bottom, the support part is abutted against the tail part of the buffer valve core.

Therefore, when the adjusting turntable part rotates to the bottom, the buffer valve core is jacked, the buffer drainage flow passage is completely blocked, and liquid or gas is ensured not to leak from the buffer drainage flow passage.

Preferably, the buffer drainage channel forms a bevel at the sealing conical surface, and the included angle between the inlet channel and the outlet channel is 100-160 °.

Therefore, the buffering discharge flow channel is divided into the linear inlet flow channel and the linear outlet flow channel, so that the processing can be simplified, the processing cost can be reduced, high-pressure liquid or gas can be prevented from being directly discharged, the pressure loss is generated at a corner, and the buffering effect is further enhanced.

In conclusion, the invention has the following beneficial effects:

the flow control buffering discharge valve is connected with the discharge valve component by adopting the transitional direct pipe and the locking threaded sleeve, has simple structure and convenient installation and replacement, and can adjust the position in the circumferential direction; the drainage valve subassembly is equipped with the change case, cushion drainage runner and buffering adjustment assembly, only need rotate the handle alright adjust the logical flow of change case, can adjust to the drainage state of closed condition, buffer state, big logical flow and the exhaust state of little logical flow to satisfy sealed, cushion the pressure release respectively, flowing back and carminative different demands, make flowing back efficiency higher, it is more stable to exhaust, and can cushion the pressure release before the drainage, ensure to use safelyr.

Drawings

FIG. 1 is a cross-sectional view of an operating condition of the flow control buffer bleed valve of the present invention;

FIG. 2 is a cross-sectional view of a rotary valve spool of an embodiment of the flow control buffer bleed valve of the present invention in a vent state;

FIG. 3 is a cross-sectional view of a rotary valve spool of an embodiment of the flow control buffer bleed valve of the present invention in a drain state;

FIG. 4 is an exploded view of the flow control buffer bleed valve trim adjustment assembly of the present invention shown removed;

FIG. 5 is a cross-sectional view of the rotary valve core of the flow control buffer relief valve of the present invention in a buffer relief state with the buffer valve core unopened;

FIG. 6 is a cross-sectional view of the rotary valve core of the flow control buffer drain valve of the present invention in a buffer relief state with the buffer valve core open;

FIG. 7 is a cross-sectional view of the flow control buffer bleed valve with the buffer spool held by the adjustment knob such that the buffer bleed flow path is blocked in accordance with the present invention;

FIG. 8 is a schematic side view of the rotary valve spool of the flow control buffer bleed valve of the present invention in a drain or venting condition;

FIG. 9 is a schematic side view of a rotary valve spool of the flow control buffer bleed valve of the present invention in a buffer relief condition;

FIG. 10 is a schematic side view of the rotary valve spool of the flow control buffer bleed valve of the present invention in a closed position;

FIG. 11 is a schematic view of the flow control buffer bleed valve of the present invention as installed in a heat exchanger;

in the figure, 1-elbow pipe, 2-straight pipe, 21-blocking edge, 3-locking thread insert, 4-relief valve component, 41-valve body, 42-rotary valve core, 421-spherical sealing body, 422-connecting rod, 423-through hole, 4231-sealing edge, 4232-through groove, 424-relief valve core, 4241-inner through hole, 4242-sealing chamfer, 4243-side through hole, 4244-relief small hole, 425-buffer relief flow passage, 426-buffer valve core mounting hole, 4261-sealing conical surface, 4262-inner thread part, 4263-grinding part, 427-buffer adjusting component, 4271-buffer valve core, 4272-buffer spring, 4273-adjusting handle, 42731-adjusting rotary disk part, 42732-outer thread part, 42733-sealing part, 42734-supporting part, 43-switching handle, 431-accommodating groove, 5-sealing gasket and 6-limiting snap spring.

Detailed Description

The invention will be further explained by means of specific embodiments with reference to the drawings.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, the flow control buffering relief valve comprises a direct pipe 2, a locking screw sleeve 3 is sleeved outside the direct pipe 2, and a relief valve assembly 4 is connected below the direct pipe 2 and the locking screw sleeve 3, and is characterized in that: the purge valve assembly 4 includes a valve body 41, a rotary valve body 42 installed in the valve body 41, and a switching handle 43 driving the rotary valve body 42 to rotate; the rotary valve core 42 comprises a spherical sealing body 421 matched with the interior of the valve body 41 and a connecting rod 422 extending from the side surface of the spherical sealing body 421 to the exterior of the valve body 41, and the outer end of the connecting rod 422 is connected with the switching handle 43; the spherical sealing body 421 is provided with a through hole 423 with the extending direction perpendicular to the extending direction of the connecting rod 422, and a relief valve core 424 is installed in the through hole 423; the spherical sealing body 421 is provided with a buffer drainage flow passage 425 at one side close to the connecting rod 422, buffer valve core mounting holes 426 are formed in the connecting rod 422 and the switching handle 43, the buffer valve core mounting holes 426 penetrate through the outer side surface of the switching handle 43 to be communicated with the buffer drainage flow passage 425, and a buffer adjusting assembly 427 is mounted in the buffer valve core mounting holes 426.

Therefore, the liquid drainage state and the gas exhaust state of the heat exchanger can be respectively switched by the rotary valve core 42 when the liquid drainage and the gas exhaust are carried out, so that the drainage valve is more stable when the liquid drainage and the gas exhaust are carried out; when the pressure in the heat exchanger is too high, the high-temperature liquid or the high-temperature liquid can be rapidly sprayed out under the action of high pressure by directly switching to a liquid discharge state or an exhaust state, so that potential safety hazards can be caused, the buffer discharge flow channel 425 is adopted to release the pressure first, and the safety of a discharge valve can be improved; by rotating the switching handle 43, the spherical sealing body 421 can be rotated, and switching between the closed state, the buffer pressure release state, the liquid discharge state, and the air discharge state is realized.

As shown in fig. 2 and 11, the upper end of the direct pipe 2 is provided with a thread for connection, the lower end of the direct pipe 2 is provided with a blocking edge 21 extending outwards, and the locking thread insert 3 is sleeved on the direct pipe 2 and the lower end of the locking thread insert is limited and blocked by the blocking edge 21.

Therefore, the elbow pipe 1 for discharging is led out from the outer wall of the shell of the heat exchanger, the outlet of the elbow pipe 1 faces downwards, the inner hole is provided with internal threads, the direct pipe 2 is in threaded connection with the elbow pipe 1, the threads can be sealed through the thread seal tape, and the connection is simple and convenient.

As shown in fig. 1, the lower part of the locking screw sleeve 3 is provided with an external thread, the inlet of the valve body 41 is connected with the locking screw sleeve 3 through the thread, and the blocking edge 21 at the lower end of the direct pipe 2 is sealed with the valve body 41 through the sealing gasket 5.

Therefore, the sealing gasket 5 is arranged in the inlet of the valve body 41, and the sealing gasket 5 is sealed by extrusion between the blocking edge 21 and the sealing surface of the valve body 41 through tight rotation of the threads between the valve body 41 and the locking screw sleeve 3; in addition, the angular position of the switching handle 43 can be adjusted by unscrewing the locking screw sleeve 3, so that the operation is more smooth.

As shown in fig. 8, 9 and 10, the through-hole 423 and the buffer drain flow passage 425 are different by 30 ° to 60 ° in the circumferential direction of rotation of the rotary valve body 42.

Thereby, the difference angle α of the through-hole 423 and the buffer drain channel 425 in the rotational path ensures that the through-hole 423 and the buffer drain channel 425 can be in a state in which one of the flow channels is open, the other flow channel is closed, and both the flow channels are in a closed state.

Example 1:

as shown in fig. 2 and 3, one end of the relief valve core 424 is a hollow inner through hole 4241, the cross section of the hollow inner through hole is a cylinder in a U shape, and the outer circle of the relief valve core 424 is in clearance fit with the through hole 423.

Therefore, the extending direction of the through hole 423 can be adjusted by rotating the spherical sealing body 421, when the two ends of the through hole 423 are adjusted to be abutted against the spherical inner wall of the valve body 41, sealing is formed between the spherical sealing body 421 and the valve body 41, and when the two ends of the through hole 423 are adjusted to be opposed to the upper channel and the lower channel of the valve body 41, liquid or gas in the heat exchanger can be discharged from the through hole 423; by installing the relief valve core 424, different drainage flow rates can be achieved when the through hole 423 is communicated in a bidirectional rotating mode, so that liquid drainage and air exhaust can be better met.

As shown in fig. 2 and 3, a sealing chamfer 4242 is arranged between the end face of the closed end of the relief valve core 424 and the cylindrical surface, a sealing edge 4231 is arranged at one end of the sealing chamfer 4242 of the through-flow hole 423, and the sealing chamfer 4242 is abutted against the sealing edge 4231 for sealing; the through hole 423 is provided with a through groove 4232 at one end of the sealing edge 4231, and the bottom diameter of the through groove 4232 is larger than the outer diameter of the relief valve core 424; a side through hole 4243 is formed in the position, opposite to the through groove 4232, of the outer circle of the drain valve core 424, and the side through hole 4243 is used for communicating the inner through hole 4241 with the through groove 4232.

Therefore, the sealing chamfer 4242 and the sealing edge 4231 are abutted to realize sealing; when the through flow hole 423 rotates to one end of the sealing edge 4231 faces upwards, the drain valve core 424 moves downwards, the drain valve core 424 and the through flow hole 423 are not sealed any more, fluid enters the inner through hole 4241 from the through flow groove 4232 through the side through hole 4243 to be drained, the through flow is large, and the liquid drainage device is suitable for liquid drainage; when the through-hole 423 is rotated to the position where the end of the sealing edge 4231 faces downward, a seal is formed between the relief valve element 424 and the through-hole 423, thereby preventing drainage.

As shown in fig. 2 and 3, a snap spring groove is formed in one end of the through hole 423, which is located at the inner through hole 4241, a limit snap spring 6 is installed in the snap spring groove, and when the relief valve spool 424 moves to abut against the limit snap spring 6, at least half of the side through hole 4243 is located within the axial width range of the through groove 4232.

Thereby, the bleed spool 424 is able to move axially to effect a bidirectional switch between sealing and through-flow.

As shown in fig. 2 and 3, a closed end surface of the drain valve core 424 is provided with a drain small hole 4244, and the drain small hole 4244 is communicated with the inner through hole 4241.

Therefore, when the through hole 423 rotates to the end of the sealing edge 4231 faces downwards, the sealing is formed between the drain valve core 424 and the through hole 423, most of fluid can only be drained from the small drain hole 4244, the flow rate is small, and the exhaust is more suitable.

As shown in FIGS. 2 and 3, the diameter of the small relief hole 4244 is 0.5mm to 3 mm.

Therefore, the diameter of the small discharge hole 4244 is 0.5 mm-3 mm, the small discharge hole is more suitable for exhausting, the valve core 424 can be replaced by detaching the limiting clamp spring 6, the valve core is simple and convenient, and the valve core 424 with different small discharge holes 4244 can be replaced according to the exhaust requirement.

Example 2:

as shown in fig. 4, 5, 6, and 7, the damper core mounting hole 426 has a sealing tapered surface 4261 at the bottom, and the damper release flow passage 425 penetrates the sealing tapered surface 4261.

Therefore, when the high-pressure liquid or gas passes through the buffer relief flow passage 425 and passes through the sealing conical surface 4261, if the sealing conical surface 4261 is in a buffer relief state under the action of the buffer adjustment assembly 427, the passage is blocked by a pressure-attached component, and higher pressure is required to jack the pressure of the buffer adjustment assembly 427, so that the high-pressure liquid or gas loses a part of the pressure, and the buffer is obtained.

As shown in fig. 4, 5, 6 and 7, the damping adjustment assembly 427 includes a damper spool 4271, a damper spring 4272 and an adjustment knob 4273, wherein the head of the damper spool 4271 is conical as the same as the sealing conical surface 4261, the damper spring 4272 is installed between the damper spool 4271 and the adjustment knob 4273, and the inner end of the damper spring 4272 abuts against the tail of the damper spool 4271.

Accordingly, the damper spool 4271 is used to seal the damper spool mounting hole 426 and provide resistance to high-pressure liquid or gas, the damper spring 4272 provides a biasing force of the damper spool 4271, and the rotation of the adjustment knob 4273 adjusts the elastic force of the damper spring 4272, thereby adjusting the damping effect.

As shown in fig. 4, 5, 6, and 7, the adjustment knob 4273 includes, from outside to inside, an adjustment dial 42731, an external thread portion 42732, a seal portion 42733, and a support portion 42734; an inward concave accommodating groove 431 is formed in the outer side of the switching handle 43, and the adjusting turntable part 42731 is located in the accommodating groove 431; the orifice of the damper valve core mounting hole 426 is provided with an internal thread part 4262, and the external thread part 42732 is matched with the internal thread part 4262; a grinding portion 4263 is provided at the junction between the inside of the damper core attachment hole 426 and the female screw portion 4262, and the seal portion 42733 is engaged with the grinding portion 4263.

Thus, the positioning of the adjustment dial portion 42731 in the accommodation groove 431 can reduce the space occupied by the adjustment knob 4273, and the sealing portion 42733 and the polishing portion 4263 can prevent leakage of liquid or gas by fitting.

As shown in fig. 4, 5, 6, and 7, a sealing member installation groove is formed on an outer circumferential surface of the sealing portion 42733, a sealing ring is installed in the sealing member installation groove, and the sealing ring is located within the range of the grinding portion 4263 in the rotation adjustment stroke of the adjustment turntable portion 42731.

Therefore, the sealing ring is generally an O-shaped ring, and the surface roughness of the grinding part 4263 is generally less than Ra3.2, so that the sealing ring is not damaged.

As shown in fig. 6, when the adjustment dial portion 42731 is rotated to the bottom, the support portion 42734 abuts against the tail of the cushion spool 4271.

Therefore, when the adjustment dial 42731 is rotated to the bottom, the damper spool 4271 is pushed up, and the damper drain passage 425 is completely blocked, thereby ensuring that no liquid or gas leaks from the damper drain passage 425.

As shown in fig. 4, 5, 6, and 7, buffer drain flow passage 425 is angled at sealing cone 4261, and the angle between the inlet flow passage and the outlet flow passage is 100-160 °.

Therefore, the buffer drainage flow passage 425 is divided into a linear inlet flow passage and a linear outlet flow passage, so that the processing can be simplified, the processing cost can be reduced, high-pressure liquid or gas can be prevented from being directly discharged, pressure loss is generated at a corner, and the buffer effect is further enhanced.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.

Claims (15)

1. Flow control buffering drainage valve, including direct pipe (2), direct pipe (2) outside cover is equipped with locking swivel nut (3), direct pipe (2) with locking swivel nut (3) below is connected with drainage valve subassembly (4), its characterized in that: the discharge valve assembly (4) comprises a valve body (41), a rotary valve core (42) arranged in the valve body (41) and a switching handle (43) for driving the rotary valve core (42) to rotate; the rotary valve core (42) comprises a spherical sealing body (421) matched with the interior of the valve body (41) and a connecting rod (422) extending outwards from the side surface of the spherical sealing body (421) to the exterior of the valve body (41), and the outer end of the connecting rod (422) is connected with the switching handle (43); the spherical sealing body (421) is provided with a through hole (423) with the extending direction perpendicular to the extending direction of the connecting rod (422), and a drainage valve core (424) is installed in the through hole (423); a buffer drainage flow channel (425) is formed in one side, close to the connecting rod (422), of the spherical sealing body (421), a buffer valve core mounting hole (426) is formed in the connecting rod (422) and the switching handle (43), the buffer valve core mounting hole (426) penetrates through the outer side face of the switching handle (43) to be communicated with the buffer drainage flow channel (425), and a buffer adjusting component (427) is mounted in the buffer valve core mounting hole (426).

2. The flow controlled buffer drain valve of claim 1, wherein: the upper end of the direct pipe (2) is processed with a thread for connection, the lower end of the direct pipe (2) is provided with a blocking edge (21) extending outwards, and the lower end of the locking threaded sleeve (3) is sleeved on the rear end of the direct pipe (2) and is limited and blocked by the blocking edge (21).

3. The flow controlled buffer bleed valve of claim 2 wherein: the lower part of the locking threaded sleeve (3) is provided with external threads, the inlet of the valve body (41) is connected with the locking threaded sleeve (3) through threads, and the blocking edge (21) at the lower end of the direct pipe (2) is sealed with the valve body (41) through a sealing gasket (5).

4. The flow controlled buffer drain valve of claim 1, wherein: the through-flow hole (423) and the buffer drain flow passage (425) are different by 30-60 degrees in the circumferential direction of rotation of the rotary valve body (42).

5. The flow controlled buffer drain valve of claim 1, wherein: one end of the relief valve core (424) is a hollow inner through hole (4241), the cross section of the relief valve core is a U-shaped cylinder, and the outer circle of the relief valve core (424) is in clearance fit with the through hole (423).

6. The flow controlled buffer drain valve of claim 5, wherein: a sealing chamfer (4242) is arranged between the end face of the closed end of the relief valve core (424) and the cylindrical surface, a sealing edge (4231) is arranged at one end of the sealing chamfer (4242) of the through-flow hole (423), and the sealing chamfer (4242) is abutted against the sealing edge (4231) for sealing; the through hole (423) is provided with a through groove (4232) at one end of the sealing edge (4231), and the diameter of the groove bottom of the through groove (4232) is larger than the outer diameter of the drainage valve core (424); the position of the outer circle of the drainage valve core (424) opposite to the through flow groove (4232) is provided with a side through hole (4243), and the side through hole (4243) is used for communicating the inner through hole (4241) with the through flow groove (4232).

7. The flow controlled buffer drain valve of claim 6, wherein: the through-flow hole (423) is located interior through-hole (4241) one end is equipped with the jump ring groove, install spacing jump ring (6) in the jump ring groove, drainage case (424) move to with when spacing jump ring (6) offset, side through-hole (4243) have at least half to be located through-flow groove (4232) axial width within range.

8. The flow controlled buffer drain valve of claim 6, wherein: the closed end surface of the drainage valve core (424) is provided with a drainage small hole (4244), and the drainage small hole (4244) is communicated with the inner through hole (4241).

9. The flow controlled buffer drain valve of claim 8, wherein: the diameter of the small discharge hole (4244) is 0.5 mm-3 mm.

10. The flow controlled buffer drain valve of claim 1, wherein: the bottom of the buffer valve core mounting hole (426) is provided with a sealing conical surface (4261), and the buffer drainage flow passage (425) penetrates through the sealing conical surface (4261).

11. The flow controlled buffer drain valve of claim 10, wherein: the buffering adjusting assembly (427) comprises a buffering valve core (4271), a buffering spring (4272) and an adjusting handle (4273), the head of the buffering valve core (4271) is conical as the sealing conical surface (4261), the buffering spring (4272) is installed between the buffering valve core (4271) and the adjusting handle (4273), and the inner end of the buffering spring (4272) abuts against the tail of the buffering valve core (4271).

12. The flow controlled buffer drain valve of claim 11, wherein: the adjusting handle (4273) comprises an adjusting turntable part (42731), an external thread part (42732), a sealing part (42733) and a supporting part (42734) from outside to inside; an inward concave accommodating groove (431) is formed in the outer side of the switching handle (43), and the adjusting turntable part (42731) is located in the accommodating groove (431); the orifice of the damper valve core mounting hole (426) is provided with an internal thread part (4262), and the external thread part (42732) is matched with the internal thread part (4262); a grinding part (4263) is arranged at the joint of the inner part of the damper valve core mounting hole (426) and the internal thread part (4262), and the sealing part (42733) is matched with the grinding part (4263).

13. The flow controlled buffer drain valve of claim 12, wherein: sealing member mounting groove has been seted up to sealing member (42733) excircle face, install the sealing washer in the sealing member mounting groove, adjust carousel portion (42731) rotation regulation stroke in, the sealing washer all is located grinding portion (4263) within range.

14. The flow controlled buffer drain valve of claim 12, wherein: when the adjusting turntable part (42731) rotates to the bottom, the support part (42734) is abutted against the tail part of the buffer valve core (4271).

15. The flow controlled buffer drain valve of claim 10, wherein: the buffer drainage flow passage (425) forms a folding angle at the sealing conical surface (4261), and the included angle between the inlet flow passage and the outlet flow passage is 100-160 degrees.

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