CN217153224U

CN217153224U - External drainage guide valve

Info

Publication number: CN217153224U
Application number: CN202122921997.2U
Authority: CN
Inventors: 陈炯亮; 霍达文; 区家显
Original assignee: GUANGDONG YONGQUAN VALVE TECHNOLOGY CO LTD
Current assignee: GUANGDONG YONGQUAN VALVE TECHNOLOGY CO LTD
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-08-09
Anticipated expiration: 2031-11-25

Abstract

The utility model discloses an outer discharge guide valve, which belongs to the technical field of valves and comprises a valve body and a valve cover, wherein the valve body is provided with a via hole, a control cavity port, an atmosphere port and a valve front port, the via hole is axially communicated with the valve front port, the control cavity port and the atmosphere port are respectively communicated with the side wall of the via hole, the valve front port, the control cavity port and the atmosphere port are axially distributed at intervals along the via hole, the control port is close to the valve front port, a valve rod for switching the conduction state of the control port with the atmosphere port and the valve front port is arranged in the via hole in a sliding way, the lower end part of the valve rod is provided with a sealing end socket, the valve cover is connected with the valve body, a movable control component for controlling the reciprocating motion of the valve rod through the pressure of the control valve behind the control valve of the control valve is arranged in the valve cover, compared with the prior art, the sensitivity of the control of the guide valve control is further improved, and the empty balance self-locking caused by the communication of the upper control cavity of the control valve and the valve rear end of the control valve is avoided, compared with the existing pilot valve, the non-pressure-difference full-open valve of the front end and the rear end of the control valve can be realized.

Description

External drainage guide valve

Technical Field

The utility model relates to a valve technical field, in particular to outer pilot valve of arranging.

Background

The self-operated control valve is a control valve which can automatically work by driving a valve by using the pressure and the temperature of a medium flowing through the valve as energy sources and does not need an external power supply and a secondary instrument. The existing control valve is divided into a direct-acting control valve and an indirect-acting control valve according to the action principle, a pilot valve is generally required to be added to the indirect-controlled self-operated control valve, the pilot valve can amplify a feedback signal, and then a valve clack of the control valve is driven to move through an actuating mechanism, so that the purpose of changing the opening degree of the valve is achieved. The existing pilot valve has low control precision, when the pilot valve is matched with a control valve for use, the problem of empty balance self-locking easily occurs to the control valve, a main valve is always in a full-open state and cannot be closed, and in order to avoid the problem of empty balance self-locking, the pressure difference of 1bar needs to exist at the front end and the rear end of the control valve, so that a group of springs are required to be arranged on a valve clack of the main valve for pressure reduction, and the control valve cannot realize a non-pressure-difference full-open valve.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects existing in the prior art, the utility model provides an outer guide valve of arranging.

The utility model provides a technical scheme that its technical problem adopted is: the outer discharge guide valve comprises a valve body and a valve cover, wherein a conducting hole, a control cavity port, an atmosphere port and a valve front port are formed in the valve body, the conducting hole is axially communicated with the valve front port, the control cavity port and the atmosphere port are respectively communicated with the side wall of the conducting hole, the valve front port, the control cavity port and the atmosphere port are axially distributed at intervals along the conducting hole, the control port is close to the valve front port, a valve rod used for switching the conducting state of the control port, the atmosphere port and the valve front port is arranged in the conducting hole in a sliding mode, a sealing end is arranged at the lower end of the valve rod, the valve cover is connected with the valve body, and a movable control assembly for controlling the reciprocating motion of the valve rod through the pressure of the control valve behind the control valve is arranged in the valve cover.

Preferably, the outer discharge guide valve further comprises a guide sleeve, the guide sleeve is embedded in the conducting hole, the lower end of the valve rod penetrates through the guide sleeve in a sliding mode, two groups of annular conducting grooves which are respectively communicated with the port of the control cavity and the port of the atmosphere are axially arranged on the outer side of the guide sleeve at intervals, and the annular conducting grooves are respectively communicated with through holes in the guide sleeve.

Preferably, the upper end and the lower end of the sealing end are respectively sleeved with a sealing ring, the upper part of the valve rod is sleeved with a sealing ring, and the outer side of the guide sleeve is provided with a plurality of groups of sealing rings in a spacing way and is respectively positioned between the two groups of annular conduction grooves and at the two ends of the guide sleeve.

Preferably, a conducting section is formed in the middle of the valve rod, and the diameter of the conducting section is smaller than that of the through hole in the guide sleeve.

Preferably, the outer discharge pilot valve further comprises a lower joint, the valve front port is arranged on the lower joint, and the upper end of the lower joint is in threaded connection with the conducting hole.

Preferably, the movable control assembly comprises an adjusting screw, a driving spring, an upper pressing plate, a lower pressing plate and a diaphragm, an adjusting cavity is formed on the diaphragm and the upper portion of the valve body and communicated with a rear valve port arranged on the valve body, the upper pressing plate and the lower pressing plate are clamped on the diaphragm and connected with the upper end portion of the valve rod, the adjusting screw is in threaded connection with a valve bonnet, the lower end of the adjusting screw is provided with the spring pressing plate, and two ends of the driving spring are respectively abutted to the upper pressing plate and the spring pressing plate.

Preferably, the upper pressing plate and the spring pressing plate are both provided with a positioning convex ring connected with the driving spring, and the outer sides of the opposite surfaces of the upper pressing plate and the lower pressing plate are both provided with an annular fillet.

The utility model has the advantages that: compared with the prior art, the pilot valve control sensitivity is further improved, meanwhile, the phenomenon that the upper control cavity of the control valve is communicated with the rear end of the control valve to cause empty balance self-locking is avoided, and compared with the existing pilot valve, the non-pressure-difference full-open valve at the front end and the rear end of the control valve can be realized.

Drawings

Fig. 1 is a partially cut-away schematic view of an embodiment (equilibrium state) of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is an enlarged schematic view at B of FIG. 1;

FIG. 4 is a perspective view of a valve stem in an embodiment of the present invention;

fig. 5 is a front view of the guide sleeve in the embodiment of the present invention;

fig. 6 is a partially cut-away schematic view of the guide sleeve in the embodiment of the present invention;

fig. 7 is a schematic connection diagram of an embodiment of the present invention;

fig. 8 is a schematic view of an open valve state in the embodiment of the present invention;

fig. 9 is a schematic view of a valve closing state according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an equilibrium state in an embodiment of the present invention.

In the figure, 10, valve body; 11. an adjustment chamber; 12. a valve rear port; 13. a valve stem; 14. a conducting section; 15. sealing the end head; 20. a control chamber port; 30. an atmospheric port; 40. a lower joint; 41. a valve front port; 51. a guide sleeve; 52. an annular conduction groove; 60. a valve cover; 61. adjusting the screw rod; 62. a spring pressing plate; 63. a drive spring; 64. an upper pressure plate; 65. a lower pressing plate; 66. a membrane; 70. a control valve; 71. an upper control chamber.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1-10, the external pilot valve provided by the present invention comprises a valve body 10 and a valve cover 60, the valve body 10 is provided with a through hole, a control chamber port 20, an atmosphere port 30 and a valve front port 41, the through hole is axially communicated with a valve front port 41, the valve front port 41 is connected with a valve front end of the control valve 70 through a pipe, the control chamber port 20 and the atmosphere port 30 are respectively communicated with a side wall of the through hole, the valve front port 41, the control cavity port 20 and the atmosphere port 30 are axially distributed at intervals along the through hole, the control port is close to the valve front port 41, the control cavity port 20 is connected with the upper control cavity 71 of the control valve 70 through a pipeline, the atmosphere port 30 is communicated with the outside, a valve rod 13 for switching the conduction state of the control port, the atmosphere port 30 and the valve front port 41 is arranged in the through hole in a sliding mode, a sealing end head 15 is arranged at the lower end portion of the valve rod 13, and the through hole is movably sealed by the sealing end head 15;

the valve cover 60 is connected with the valve body 10, a movable control assembly which controls the reciprocating motion of the valve rod 13 through the control valve 70 is arranged in the valve cover 60, the movable control assembly comprises an adjusting screw 61, a driving spring 63, an upper pressing plate 64, a lower pressing plate 65 and a membrane 66, an adjusting cavity 11 is formed on the upper portion of the membrane 66 and the upper portion of the valve body 10, the adjusting cavity 11 is communicated with a valve rear port 12 arranged on the valve body 10, the valve rear port 12 is connected with the valve rear end of the control valve 70 through a pipeline, the upper pressing plate 64 and the lower pressing plate 65 are clamped on the membrane 66 and connected with the upper end portion of the valve rod 13, the adjusting screw 61 is in threaded connection with the valve cover 60, the spring pressing plate 62 is arranged at the lower end of the adjusting screw 61, and two ends of the driving spring 63 are respectively abutted to the upper pressing plate 64 and the spring pressing plate 62.

Specifically, after the pilot valve is connected to the control valve 70, the adjusting chamber 11 is communicated with the valve rear end of the control valve 70 through the valve rear port 12, and the valve rear end pressure of the control valve 70 acts below the diaphragm 66, so that an upward pushing force F is formed on the diaphragm 66 _{Push away} At the same time, the driving spring 63 can be compressed by rotating the adjusting screw 61, so that a spring pressure F acting on the upper pressing plate 64 and pushing the diaphragm 66 to move downwards is formed _Bullet The spring pressure F can be adjusted by adjusting the compression amount of the drive spring 63 by turning the adjusting bolt _Bullet The larger the compression amount of the drive spring 63 is, the larger the spring pressure F _Bullet The greater the pressure at the valve rear end of the control valve 70, the greater the thrust of the pressure on the diaphragm 66, i.e., the thrust force F _{Push away} The larger the magnitude of the two forces, the more the valve rod 13 can be controlled to reciprocate up and down.

Referring to FIG. 8, the valve opening operation of the control valve 70 is controlled such that when the valve rear end pressure of the control valve 70 is too low (spring pressure F) _Bullet Greater than thrust force F _{Push away} ) The driving spring 63 pushes the valve rod 13 to slide downwards to synchronously drive the sealing end head 15 to slide downwards, the control cavity port 20 is communicated with the atmosphere port 30, and the fluid medium in the upper control cavity 71 of the control valve 70 can flow to the atmosphere end through the gap between the upper part of the valve rod 13 and the through holeThe port 30 is thus vented to the outside of the pilot valve, the pressure in the upper control chamber 71 of the control valve 70 decreases, the pressure in the front end of the control valve 70 pushes the main valve of the control valve 70 open, the pressure in the rear end of the control valve 70 increases, the valve stem 13 slides upwards to return, and the pressure in the synchronous regulation chamber 11 increases (pushing force F) _{Push away} Increase) until the spring pressure F _Bullet Equal to thrust force F _{Push away} (see fig. 10) that is, the valve stem 13 is slid upward until the sealing tip 15 completely seals the control chamber port 20.

Referring to fig. 9, the valve closing operation of the control valve 70 is controlled when the valve rear end pressure of the control valve 70 is excessively high (spring pressure F) _Bullet Less than thrust force F _{Push away} ) Thrust force F _{Push away} Against spring pressure F _Bullet The valve rod 13 is pushed to slide upwards, the sealing end head 15 is synchronously driven to slide upwards, the control cavity port 20 is communicated with the valve front port 41, fluid medium at the valve front end of the control valve 70 can flow into the upper control cavity 71 of the control valve 70 through the control cavity port 20, the pressure in the upper control cavity 71 is increased, so that the main valve of the control valve 70 is pushed to be closed, the pressure at the valve rear end of the control valve 70 is reduced along with the reduction of the pressure, the valve rod 13 slides downwards to reset, and the pressure in the synchronous adjusting cavity 11 is reduced (thrust F _{Push away} Decrease) until the spring pressure F _Bullet Equal to thrust force F _{Push away} (see fig. 10) i.e. the valve stem 13 is slid down until the sealing tip 15 completely seals the control chamber port 20.

The switching speed of the control valve 70 for opening and closing is fast and slow, when the control chamber port 20 is switched and communicated with the atmosphere port 30 and the valve front port 41 alternately, the length of the sliding distance required by the sealing end 15 is affected, compared with the prior art, the sensitivity of pilot valve control is further improved, meanwhile, the phenomenon that the upper control chamber 71 of the control valve 70 is communicated with the valve rear end of the control valve 70 to cause empty balance self-locking is avoided, and compared with the existing pilot valve, the non-pressure-difference full-open valve of the valve front end and the valve rear end of the control valve 70 can be realized.

Further, the outer discharge pilot valve also comprises a guide sleeve 51, the guide sleeve 51 is embedded in the conducting hole, the lower end of the valve rod 13 is slidably arranged in the guide sleeve 51, two groups of annular conduction grooves 52 which are respectively communicated with the control cavity port 20 and the atmosphere port 30 are axially arranged at intervals outside the guide sleeve 51, the two groups of annular conduction grooves 52 are respectively communicated with through holes in the guide sleeve 51, the upper end and the lower end of the sealing end head 15 are respectively sleeved with a sealing ring, the upper part of the valve rod 13 is sleeved with a sealing ring, the outer side of the guide sleeve 51 is provided with a plurality of groups of sealing rings in a spacing sleeve way, and are respectively positioned between the two groups of annular conduction grooves 52 and two ends of the guide sleeve 51, when the valve rod 13 is driven by the movable control component to slide back and forth, the control chamber port 20 is switched to be communicated with the atmosphere port 30 and the valve front port 41 respectively through the lifting action of the sealing end head 15, or by closing the control chamber port 20 with the sealing tip 15 to control the opening and closing of the control valve 70.

Further, a conducting section 14 is formed in the middle of the valve rod 13, the diameter of the conducting section 14 is smaller than that of the through hole in the guide sleeve 51, a larger gap can be formed between the conducting section 14 and the side wall of the through hole in the guide sleeve 51, and the pressure relief or charging speed of the control cavity 71 on the control valve 70 can be adjusted by controlling the size of the gap.

Further, the outer discharge pilot valve further comprises a lower joint 40, the valve front port 41 is arranged on the lower joint 40, the upper end of the lower joint 40 is in threaded connection with the conducting hole, and the guide sleeve 51 is inserted and fixed in the valve body 10 by screwing the lower joint 40.

Furthermore, the upper pressing plate 64 and the spring pressing plate 62 are both provided with a positioning convex ring used for being connected with the driving spring 63, the driving spring 63 is prevented from being dislocated through the positioning convex ring, and the outer sides of the opposite surfaces of the upper pressing plate 64 and the lower pressing plate 65 are both provided with annular fillets used for preventing the diaphragm 66 from being scratched.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. An external pilot valve comprising a valve body (10) and a valve cover (60), characterized in that: be equipped with conducting hole, control chamber port (20), port (30) and valve front port (41) on valve body (10), port (41) axial intercommunication before conducting hole and the valve, the lateral wall of conducting hole is communicate respectively to control chamber port (20) and atmosphere port (30), and port (41), control chamber port (20) and atmosphere port (30) are followed conducting hole axial interval distribution before the valve, and the control port is close to port (41) before the valve, and the slip is equipped with valve rod (13) that are used for switching control port and port (30) and valve front port (41) conducting state in the conducting hole, and valve rod (13) lower tip is equipped with sealing end (15), valve gap (60) are connected with valve body (10), are equipped with the movable control subassembly through pressure control valve rod (13) reciprocating motion behind control valve (70) in valve gap (60).

2. An external pilot valve according to claim 1, wherein: the valve rod structure is characterized by further comprising a guide sleeve (51), the guide sleeve (51) is embedded into the conducting hole, the lower end of the valve rod (13) penetrates through the guide sleeve (51) in a sliding mode, two groups of annular conducting grooves (52) which are communicated with the control cavity port (20) and the atmosphere port (30) respectively are axially arranged on the outer side of the guide sleeve (51) at intervals, and the annular conducting grooves (52) are communicated with through holes in the guide sleeve (51) respectively.

3. An external pilot valve according to claim 2, wherein: the upper end and the lower end of the sealing end (15) are respectively sleeved with a sealing ring, the upper part of the valve rod (13) is sleeved with the sealing ring, and a plurality of groups of sealing rings are sleeved on the outer side of the guide sleeve (51) at intervals and are respectively positioned between the two groups of annular conduction grooves (52) and at the two ends of the guide sleeve (51).

4. An external pilot valve according to claim 2, wherein: the middle part of the valve rod (13) is provided with a conducting section (14), and the diameter of the conducting section (14) is smaller than that of the through hole in the guide sleeve (51).

5. An external pilot valve according to claim 1, wherein: the valve further comprises a lower connector (40), a valve front port (41) is arranged on the lower connector (40), and the upper end of the lower connector (40) is in threaded connection with the through hole.

6. An external pilot valve according to claim 1, wherein: the movable control assembly comprises an adjusting screw rod (61), a driving spring (63), an upper pressing plate (64), a lower pressing plate (65) and a diaphragm (66), the diaphragm (66) and the upper portion of the valve body (10) are provided with an adjusting cavity (11), the adjusting cavity (11) is communicated with a valve rear port (12) formed in the valve body (10), the upper pressing plate (64) and the lower pressing plate (65) are clamped on the diaphragm (66) and connected with the upper end portion of the valve rod (13), the adjusting screw rod (61) is in threaded connection with the valve cover (60), a spring pressing plate (62) is arranged at the lower end of the adjusting screw rod (61), and two ends of the driving spring (63) are respectively abutted to the upper pressing plate (64) and the spring pressing plate (62).

7. An external pilot valve according to claim 6, wherein: the upper pressure plate (64) and the spring pressure plate (62) are provided with positioning convex rings used for being connected with a driving spring (63), and the outer sides of the opposite surfaces of the upper pressure plate (64) and the lower pressure plate (65) are provided with annular fillets.