CN210128088U

CN210128088U - Pressure cage type micro flow regulating valve

Info

Publication number: CN210128088U
Application number: CN201920735874.XU
Authority: CN
Inventors: 陈孙强
Original assignee: Yichuang Valve Technology Co Ltd
Current assignee: Yichuang Valve Technology Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-03-06
Anticipated expiration: 2029-05-21

Abstract

The utility model discloses a press cage type micro flow regulating valve, which comprises a valve body, a valve rod, a valve seat, a valve cover and a packing box, wherein the lower end of the valve rod is integrally provided with a valve core, and the press cage type micro flow regulating valve also comprises a press cage, the upper end surface and the lower end surface of the press cage respectively contact with the valve cover and the valve seat to be positioned and installed in the valve body, and the valve seat is tightly pressed in the valve body through the press cage; the pressure cage is internally provided with a guide hole, the valve core comprises a guide cylinder body positioned above, and the guide cylinder body is sleeved in the pressure cage and is in clearance and hard guide fit with the guide hole. The valve seat adopts a compression type connecting structure, a threaded valve seat is cancelled, a valve can be disassembled and assembled without a special tool, the rapid disassembly and assembly can be realized, the interchangeability is strong, the structure is compact, and the maintenance is convenient; the pressure cage has a guiding function on the valve core, so that the operation reliability of the valve core is ensured, and the sealing performance is obviously improved.

Description

Pressure cage type micro flow regulating valve

Technical Field

The utility model belongs to the technical field of the valve and specifically relates to a press small flow control valve of cage formula.

Background

The micro flow regulating valve is suitable for regulating smaller flow and has the characteristics of compact structure, small volume, light weight, convenient installation and maintenance and high flow characteristic control in high-precision occasions. The conventional regulating valve is limited by the size, the material and the processing equipment of the valve core, the valve core cannot be in a micro-caliber, the valve core cannot be processed when the caliber is smaller than 3 calibers, even if the processing tolerance is too large, the strength of the material of the valve core which is too small cannot meet the working condition, and the fracture bending deformation phenomenon is endless. In the industry of regulating valves, when the CV or KV value of a regulating valve is less than 0.01, for example, the flow of only 0.01 cubic meter of water per hour needs to be regulated, it becomes very difficult to design and manufacture, when the minute flow with CV less than or equal to 0.01 is regulated, the gap between the valve core and the valve seat ring is very small, the change curved surface of the valve core is also very small, it is also difficult to process on a precision lathe, the valve rod operation precision cannot ensure that the valve core and the valve seat are not locked or worn, and the defects of large flow curve deviation, low positioning precision, serious flow fluctuation, low control precision and the like generally exist. In addition, the conventional threaded valve seat of the regulating valve is troublesome to mount and needs to be disassembled and assembled by a special clamp, once the valve core and the valve seat are damaged on site, the valve seat can be rusted on the valve body under the action of a valve medium, and the valve seat cannot be disassembled and can only be repaired.

Disclosure of Invention

The utility model aims at: in order to overcome prior art's defect, the utility model provides a small flow control valve of pressure cage formula that valve rod operation is accurate, disk seat easy dismounting, sealing performance are good to can satisfy the KV value of small flow.

The technical scheme of the utility model: the valve comprises a valve body, a valve rod, a valve seat, a valve cover and a packing box, wherein a valve core is integrally arranged at the lower end of the valve rod; the pressure cage is internally provided with a guide hole, the valve core comprises a guide cylinder body positioned above, and the guide cylinder body is sleeved in the pressure cage and is in clearance and hard guide fit with the guide hole.

By adopting the technical scheme, the valve seat adopts a compression type connecting structure, a threaded valve seat is cancelled, the valve can be disassembled and assembled without special tools, the rapid disassembly and assembly can be realized, the interchangeability is strong, the structure is compact, and the maintenance is convenient; the pressure cage has the guide effect to the case, and the clearance has the clearance to the hard direction, and the case control is at the small removal of clearance scope during the direction, makes the case move in certain extent, has promoted valve rod operation precision, and the case location is more accurate, avoids the case to damage the disk seat simultaneously, and leads to disk seat deformation too big or wearing and tearing scheduling problem, influences the life of case and disk seat, ensures the case operation reliability can, is showing improvement sealing performance.

The utility model discloses a further setting: the valve core further comprises a flow control body located below, the flow control body is connected with the valve seat in a sliding fit mode, a V-shaped guide groove is formed in the flow control body, and the size of the V-shaped guide groove gradually increases from top to bottom and gradually increases from inside to outside.

By adopting the further arrangement, the V-shaped diversion trench overcomes the size defect of the valve core, avoids the condition that the valve core is machined to a small caliber and can also meet the KV value of a small flow, has good small flow regulation capacity, can also avoid the direct scouring of a sealing surface by a medium when the pressure difference is large, and prolongs the service life of the valve.

The utility model discloses a further setting again: the valve seat comprises an outer body, a soft sealing body, an upper gasket, a disc spring, a lower gasket and a locking nut, wherein the outer body is provided with a mounting hole and a sealing hole which are communicated with each other; the soft sealing body and the sealing hole are respectively in sealing fit with the flow control body.

Adopt above-mentioned further setting again, the dish spring carries out the elastic compensation to the sealed of soft seal body and flow control body to further strengthen sealing performance, show the leakage quantity that reduces.

The utility model discloses a still further set up: a plurality of radial flow passages communicated with the inside and the outside of the pressing cage are formed in the outer wall of the pressing cage, and the plurality of radial flow passages are formed in the radial direction of the pressing cage and are arranged around the axis of the pressing cage.

By adopting the still further arrangement, the radial flow channel is used for medium circulation, so that the noise can be reduced, and the flow velocity of the medium can be reduced.

The utility model discloses a still further set up: the top of the pressing cage is provided with at least one axial flow channel communicated with the inside and the outside of the pressing cage, and the axial flow channel is arranged in the axial direction of the pressing cage and is used for communicating the inner cavity of the valve cover with the inner cavity of the valve body.

By adopting the above further arrangement, the inner cavity of the valve cover has medium pressure, so that the valve can be self-sealed, and the sealing performance of the stuffing box part is improved.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic structural view of the pressing cage of the present invention;

FIG. 4 is a schematic structural view of the valve stem and the valve core of the present invention;

the valve comprises a valve body 1, a valve rod 2, a valve seat 3, a valve cover 4, a stuffing box 5, a pressing cage 6, a valve core 7, a guide hole 61, a guide cylinder 71, a flow control body 72, a V-shaped guide groove 721, an outer body 31, a soft sealing body 32, an upper gasket 33, a disc spring 34, a lower gasket 35, a locking nut 36, a radial flow passage 62 and an axial flow passage 63.

Detailed Description

The press cage type micro flow regulating valve shown in fig. 1-4 comprises a valve body 1, a valve rod 2, a valve seat 3, a valve cover 4, a stuffing box 5 and a press cage 6, wherein a valve core 7 is integrally arranged at the lower end of the valve rod 2, the stuffing box 5 is arranged in the valve cover 4, the upper end surface and the lower end surface of the press cage 6 are respectively contacted with the valve cover 4 and the valve seat 3 to be positioned and installed in the valve body 1, and the valve seat 3 is tightly pressed in the valve body 1 through the press cage 6; the pressure cage 6 is internally provided with a guide hole 61, the valve core 7 comprises a guide cylinder 71 positioned above, and the guide cylinder 71 is sleeved in the pressure cage 6 and is in clearance and hard guide fit with the guide hole 61. The pressing cage 6 is clamped between the valve cover 4 and the valve seat 3, and the pressing cage 6 and the valve seat 3 can be pressed by fastening the valve cover 4, so that the purpose of convenient disassembly and assembly is achieved, and the interchangeability requirement is met. The guide hole 61 in the pressure cage 6 can limit the valve core 7, and when the valve is opened and closed, the guide column 71 of the valve core 7 is always matched in the guide hole 61 in a sliding manner. The guide cylinder 71 is in the shape of a cylinder for ease of machining and to take into account stress effects.

The valve core 7 further comprises a flow control body 72 positioned below, the flow control body 72 is connected with the valve seat 3 in a sliding fit mode to be used for controlling flow, a V-shaped diversion groove 721 is formed in the flow control body 72, the size of the V-shaped diversion groove 721 is gradually increased from top to bottom and gradually increased from inside to outside, the overall V-shaped diversion groove 721 is in a triangular cone shape, and the requirement for KV value of small flow can be met.

The valve seat 3 comprises an outer body 31, a soft sealing body 32, an upper gasket 33, a disc spring 34, a lower gasket 35 and a locking nut 36, wherein the outer body 31 is provided with a mounting hole and a sealing hole which are communicated with each other, the soft sealing body 32, the upper gasket 33, the disc spring 34, the lower gasket 35 and the locking nut 36 are all mounted in the mounting hole and are arranged from the bottom of the mounting hole to the orifice of the mounting hole according to the sequence, and the locking nut 36 is in threaded fit with the mounting hole for fastening; when the valve operates, the flow control body 72 is inserted into the sealing hole to realize pre-sealing in the descending process and is in contact with the soft sealing body to form sealing connection, and the elastic action of the disc spring 34 can elastically compensate the soft sealing body so as to enhance the sealing performance of the sealing surface.

Sixty-four radial flow passages 62 communicated with the inside and the outside of the pressure cage are formed in the outer wall of the pressure cage 6, the medium flowing direction of the radial flow passages 62 is the radial direction of the pressure cage, the sixty-four radial flow passages 62 are divided into four groups, sixteen radial flow passages 62 in each group are surrounded by the axis of the pressure cage 6, and the four groups of radial flow passages 62 are uniformly arranged in the axial direction of the pressure cage 6. Four axial flow channels 63 which are communicated with the inside and the outside of the pressure cage 6 are formed in the top of the pressure cage 6, the medium flowing direction of the axial flow channels 63 is the same as the axial direction of the pressure cage 6, and the axial flow channels are used for communicating the inner cavity of the valve cover 4 with the inner cavity of the valve body 1. When the medium circulates, the radial flow passage 62 can reduce noise, reduce the flow rate of the medium and avoid scouring the sealing surface; the medium flows through the inner cavity of the valve cover 4 through the axial flow passage 63, pressure can be applied to the stuffing box 5, the self sealing of the valve is realized, and the sealing performance of the stuffing box 5 is improved.

Claims

1. The utility model provides a little flow control valve of pressure cage formula, including valve body, valve rod, disk seat, valve gap and stuffing box, valve rod lower extreme an organic whole is provided with case, its characterized in that: the upper end surface and the lower end surface of the pressing cage are respectively contacted with the valve cover and the valve seat to be positioned and installed in the valve body, and the valve seat is tightly pressed in the valve body through the pressing cage; the pressure cage is internally provided with a guide hole, the valve core comprises a guide cylinder body positioned above, and the guide cylinder body is sleeved in the pressure cage and is in clearance and hard guide fit with the guide hole.

2. The piezo-cage micro flow control valve of claim 1, wherein: the valve core further comprises a flow control body located below, the flow control body is connected with the valve seat in a sliding fit mode, a V-shaped diversion trench is formed in the flow control body, and the size of the V-shaped diversion trench is gradually increased from top to bottom and gradually increased from inside to outside.

3. The pressure-cage type micro flow control valve according to claim 1 or 2, wherein: the valve seat comprises an outer body, a soft sealing body, an upper gasket, a disc spring, a lower gasket and a locking nut, wherein the outer body is provided with a mounting hole and a sealing hole which are communicated with each other; the soft sealing body and the sealing hole are respectively in sealing fit with the flow control body.

4. The pressure-cage type micro flow control valve according to claim 1 or 2, wherein: the outer wall of the pressing cage is provided with a plurality of radial runners communicated with the inside and the outside of the pressing cage, and the plurality of radial runners are arranged in the radial direction of the pressing cage and surround the axis of the pressing cage.

5. The piezo-cage micro flow control valve of claim 4, wherein: the top of the pressing cage is provided with at least one axial flow channel communicated with the inside and the outside of the pressing cage, and the axial flow channel is arranged in the axial direction of the pressing cage and is used for communicating the inner cavity of the valve cover and the inner cavity of the valve body.