CN218094414U

CN218094414U - Cavitation-proof minimum flow valve

Info

Publication number: CN218094414U
Application number: CN202222079328.XU
Authority: CN
Inventors: 潘彦杰; 杨芳芳; 郑浩; 宁青青; 潘新华
Original assignee: Zhejiang Desheng Valve Technology Co ltd
Current assignee: Zhejiang Desheng Valve Technology Co ltd
Priority date: 2022-08-06
Filing date: 2022-08-06
Publication date: 2022-12-20
Anticipated expiration: 2032-08-06

Abstract

The utility model discloses an anti-cavitation minimum flow valve, which comprises a main valve component and a bypass component, wherein the bypass component comprises a bypass valve body, a controller cover, a bypass bushing, a bypass valve rod and a bypass valve core; the bypass valve comprises a bypass valve core and a bypass bushing, wherein the periphery of the bypass valve core is uniformly provided with a plurality of pressure reducing flanges along the axial direction, the inner periphery of the bypass bushing is uniformly provided with a plurality of valve seat flanges which are used for forming sealing fit with the pressure reducing flanges along the axial direction, when the pressure reducing flanges are abutted against the corresponding valve seat flanges, a medium in the bypass valve body is blocked, and when the pressure reducing flanges are separated from the corresponding valve seat flanges, a pressure reducing flow channel is formed between the bypass valve core and the bypass bushing. The utility model discloses can avoid the cavitation to the damage of valve to the life and the security performance of extension valve.

Description

Cavitation-proof minimum flow valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a minimum flow valve of anti-cavitation.

Background

The minimum flow valve is mainly used for adjusting the flow of the medium and has the functions of pressure reduction and overflow, and is usually installed at the outlet of a high-pressure and low-pressure feed water pump pipeline. When the water supply pump operates at a flow lower than the minimum flow, water flows back into the deaerator through the minimum flow valve, the inlet water supply flow of the water supply pump is increased through the recirculation of the water supply pump, so that the water supply pump can normally operate at the minimum flow, the overheating of the water supply pump is prevented, and the normal continuous safe operation of the water pump is guaranteed. When the flow of the water supply pump is larger than the minimum flow and has a certain margin, the minimum flow valve can also return the redundant flow to the deaerator, so that resources are saved and the efficiency is improved.

In the minimum flow valve with the existing structure, when a bypass valve of the minimum flow valve is partially opened, a medium passes through a position between a bypass bushing and a bypass valve core of the bypass valve at a high speed, and after the medium is contacted with the surface of the inner wall of the valve, bubbles are easily generated on the surface of the inner wall of the valve and then collapse, so that the phenomenon of cave-shaped corrosion damage, namely cavitation phenomenon, is caused; cavitation erosion easily causes leakage of the valve and even accidents.

Therefore, there is a need for an improved minimum flow valve that prevents cavitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prevent cavitation erosion minimum flow valve, the utility model discloses can avoid cavitation erosion to the damage of valve to the life and the security performance of extension valve.

In order to achieve the above object, the utility model provides a following technical scheme: the cavitation-resistant minimum flow valve comprises a main valve component and a bypass component, wherein the bypass component comprises a bypass valve body, a controller cover, a bypass bushing, a bypass valve rod and a bypass valve core, the controller cover and the bypass bushing are installed in the bypass valve body, the bypass valve rod penetrates through the controller cover, and the bypass valve rod is in linkage connection with the bypass valve core; the bypass valve comprises a bypass valve core and a bypass bushing, wherein the periphery of the bypass valve core is uniformly provided with a plurality of pressure reducing flanges along the axial direction, the inner periphery of the bypass bushing is uniformly provided with a plurality of valve seat flanges which are used for forming sealing fit with the pressure reducing flanges along the axial direction, when the pressure reducing flanges are abutted against the corresponding valve seat flanges, a medium in the bypass valve body is blocked, and when the pressure reducing flanges are separated from the corresponding valve seat flanges, a pressure reducing flow channel is formed between the bypass valve core and the bypass bushing.

Through adopting above-mentioned technical scheme, because a plurality of decompression flanges and a plurality of valve seat flange are crisscross to be set up, when the bypass subassembly was opened, formed a crooked decompression runner repeatedly between a plurality of decompression flanges and a plurality of valve seat flange, the fluid resistance increase when the fluid passes through the decompression runner, and the energy reduces, plays the function of multistage decompression, can avoid the cavitation to the damage of valve to the life and the security performance of extension valve.

The utility model discloses further set up to, the one end that the bypass valve rod is close to the bypass case is equipped with screw rod portion, seted up on the bypass case with screw rod portion matched with screw.

By adopting the technical scheme, the quick disassembly and assembly of the bypass valve rod and the bypass valve core are convenient to realize, and the assembly in the previous stage and the subsequent maintenance and replacement operation are facilitated.

The utility model discloses further set up to, the bypass subassembly still includes the pretension spring, the one end that the bypass valve rod is close to the bypass case is equipped with first spring groove, the one end that the bypass case is close to the bypass valve rod is equipped with second spring groove, pretension spring housing is established screw rod portion periphery, and the both ends of pretension spring inlay respectively and establish in first spring groove and second spring groove.

Through adopting above-mentioned technical scheme, the pretension spring can provide the pretightning force to the connection structure of bypass valve rod and bypass case to promote the frictional force between the screw rod portion of bypass valve rod and the screw of bypass case, and then promote bypass valve rod and bypass case connection structure's steadiness.

The utility model discloses further set up as, main valve subassembly includes the main valve body, main valve case and eccentric rod, the main valve case slides and sets up in the main valve body, is equipped with in the main valve body and is used for propping up with the main valve case and constitutes sealed complex sealed step, the eccentric rod is articulated mutually with the main valve body, and the one end of eccentric rod is propped up with the main valve case, and the other end of eccentric rod is propped up with the bypass valve rod; the controller is characterized in that a sliding cavity is arranged in the controller cover, a first piston part attached to the inner periphery of the sliding cavity is arranged on the bypass valve rod, and a second piston part attached to the inner periphery of the sliding cavity is arranged on the bypass valve core.

By adopting the technical scheme, the linkage between the main valve core and the bypass valve core can be realized, the closing of the main valve component is realized, the opening of the bypass component is realized, the opening of the main valve component is realized, and the closing of the bypass component is realized.

The utility model discloses further set up to, internal first supporting disk and the second supporting disk of installing of main valve, install the guide arm on the first supporting disk, be equipped with the confession on the main valve case the spring chamber that the guide arm stretched into, the spring intracavity is equipped with the main valve spring, main valve spring one end offsets with the guide arm lower extreme, and the other end of main valve spring offsets with the lower extreme in spring chamber, be equipped with on the second supporting disk with main valve case lower extreme matched with guide hole.

By adopting the technical scheme, the stability of the movement of the valve core of the main valve in the opening and closing process can be ensured.

The utility model discloses further set up to, the lower extreme in spring chamber is equipped with first constant head tank, the lower extreme of guide arm is equipped with the second constant head tank, the both ends of main valve spring are inlayed respectively and are established in first constant head tank and second constant head tank.

Through adopting above-mentioned technical scheme, can promote the steadiness of main valve spring installation to guarantee that it is axial deformation all the time, promote its life.

The utility model discloses further set up to, main valve internal wall corresponds the position of sealed step top is equipped with internal thread portion, threaded connection has the cover that shocks resistance in the internal thread portion.

By adopting the technical scheme, the inner wall of the main valve body is most strongly impacted by media at the opening moment of the main valve component at the position above the sealing step, so that the main valve component is most easily influenced by scouring and cavitation, and the impact-resistant sleeve is arranged to protect the main valve body, so that the service life of the valve is further prolonged.

Drawings

Fig. 1 is a schematic overall structure diagram of the present invention;

fig. 2 is an enlarged schematic view of a portion a in fig. 1.

In the figure: 1. a main valve assembly; 2. a bypass assembly; 3. a bypass valve body; 4. a controller cover; 5. a bypass bushing; 6. a bypass valve stem; 7. a bypass spool; 8. a pressure relief flange; 9. a valve seat flange; 10. a pressure reducing flow channel; 11. a screw section; 12. a screw hole; 13. pre-tightening the spring; 14. a first spring groove; 15. a second spring groove; 16. a main valve body; 17. a main valve spool; 18. an eccentric rod; 19. sealing the step; 20. a slide chamber; 21. a first piston portion; 22. a second piston portion; 23. a first support tray; 24. a second support disc; 25. a guide bar; 26. a spring cavity; 27. a main valve spring; 28. a guide hole; 29. a first positioning groove; 30. a second positioning groove; 31. an internal thread portion; 32. impact-resistant sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Example (b): the anti-cavitation minimum flow valve shown in the attached figures 1 and 2 comprises a main valve assembly 1 and a bypass assembly 2, wherein the bypass assembly 2 comprises a bypass valve body 3, a controller cover 4, a bypass bushing 5, a bypass valve rod 6 and a bypass valve core 7, the controller cover 4 and the bypass bushing 5 are installed in the bypass valve body 3, the bypass valve rod 6 is arranged on the controller cover 4 in a penetrating way, a through hole for medium to pass through is formed in the controller cover 4, and the bypass valve rod 6 is connected with the bypass valve core 7 in an interlocking way; the bypass valve element 7 is characterized in that a plurality of pressure reducing flanges 8 are uniformly arranged on the outer periphery of the bypass valve element 7 along the axial direction, the cross sections of the pressure reducing flanges 8 are in an inward convex conical shape, a plurality of valve seat flanges 9 which are used for forming sealing fit with the pressure reducing flanges 8 are uniformly arranged on the inner periphery of the bypass bushing 5 along the axial direction, the cross sections of the valve seat flanges 9 are in an inward convex arc surface shape, when the pressure reducing flanges 8 abut against the corresponding valve seat flanges 9, a medium in the bypass valve body 3 is blocked, and when the pressure reducing flanges 8 are separated from the corresponding valve seat flanges 9, a pressure reducing flow channel 10 is formed between the bypass valve element 7 and the bypass bushing 5. Because the plurality of pressure reducing flanges 8 and the plurality of valve seat flanges 9 are arranged in a staggered manner, when the bypass assembly 2 is opened, a pressure reducing flow passage 10 which is repeatedly bent is formed between the plurality of pressure reducing flanges 8 and the plurality of valve seat flanges 9, the fluid resistance is increased when fluid passes through the pressure reducing flow passage 10, the energy is reduced, the function of multi-stage pressure reduction is achieved, the damage of cavitation erosion to the valve can be avoided, and the service life and the safety performance of the valve are prolonged.

As shown in fig. 2, a screw portion 11 is disposed at one end of the bypass valve rod 6 close to the bypass valve core 7, and a screw hole 12 matched with the screw portion 11 is disposed on the bypass valve core 7. This design is convenient for realize bypass valve rod 6 and bypass case 7's quick assembly disassembly, does benefit to the equipment of earlier stage and subsequent maintenance change operation to this design is also convenient for adjust bypass valve rod 6 and bypass case 7's integral connection length, thereby can reduce the machining precision requirement to bypass valve body 3, reduces the processing cost.

As shown in fig. 2, the bypass assembly 2 further includes a pre-tightening spring 13, a first spring groove 14 is formed in one end of the bypass valve rod 6 close to the bypass valve core 7, a second spring groove 15 is formed in one end of the bypass valve core 7 close to the bypass valve rod 6, the pre-tightening spring 13 is sleeved on the periphery of the screw rod portion 11, and two ends of the pre-tightening spring 13 are respectively embedded in the first spring groove 14 and the second spring groove 15. The pre-tightening spring 13 can provide pre-tightening force for the connection structure of the bypass valve rod 6 and the bypass valve core 7, so that the friction force between the screw part 11 of the bypass valve rod 6 and the screw hole 12 of the bypass valve core 7 is improved, and the stability of the connection structure of the bypass valve rod 6 and the bypass valve core 7 is improved.

As shown in fig. 1 and fig. 2, the main valve assembly 1 includes a main valve body 16, a main valve core 17 and an eccentric rod 18, the bypass valve body 3 is mounted on a side portion of the main valve body 16 through a bolt, and an inner cavity of the main valve body 16 is communicated with an inner cavity of the bypass valve body 3, the main valve core 17 is slidably disposed in the main valve body 16, a sealing step 19 for abutting against the main valve core 17 and forming a sealing fit is disposed in the main valve body 16, the eccentric rod 18 is hinged to the main valve body 16, and one end of the eccentric rod 18 abuts against the main valve core 17, and the other end of the eccentric rod 18 abuts against the bypass valve rod 6, that is, a through hole with two large ends and a small middle is disposed on the main valve core 17, one end of the eccentric rod 18 is inserted into the through hole, and when the main valve core 17 slides up and down, the eccentric rod 18 can swing around its hinge point under the driving of the main valve core 17; the controller cover 4 is internally provided with a sliding cavity 20, the bypass valve rod 6 is provided with a first piston part 21 attached to the inner periphery of the sliding cavity 20, the bypass valve core 7 is provided with a second piston part 22 attached to the inner periphery of the sliding cavity 20, and pressure stabilizing holes can be formed in the first piston part 21 and the second piston part 22 to ensure that the first piston part 21 and the second piston part 22 smoothly slide. The design can realize linkage between the main valve core 17 and the bypass valve core 7, and realize that the main valve component 1 is closed, the bypass component 2 is opened, the main valve component 1 is opened, and the bypass component 2 is closed.

As shown in fig. 1, a first support disk 23 and a second support disk 24 are installed in the main valve body 16, and may be installed in the main valve body 16 in an interference manner, or may be welded in the main valve body 16, a guide rod 25 is installed on the first support disk 23 through a screw, a spring cavity 26 into which the guide rod 25 extends is provided on the main valve spool 17, a main valve spring 27 is provided in the spring cavity 26, one end of the main valve spring 27 abuts against the lower end of the guide rod 25, the other end of the main valve spring 27 abuts against the lower end of the spring cavity 26, and a guide hole 28 matched with the lower end of the main valve spool 17 is provided on the second support disk 24. The design can ensure the motion stability of the main valve core 17 in the opening and closing process.

As shown in fig. 1, the spring chamber 26 has a first positioning groove 29 at a lower end thereof, the guide rod 25 has a second positioning groove 30 at a lower end thereof, and the main valve spring 27 has two ends respectively inserted into the first positioning groove 29 and the second positioning groove 30. This design can promote the steadiness of main valve spring 27 installation to guarantee that it is warp all the time in the axial, promote its life.

As shown in fig. 1, an internal thread portion 31 is provided on the inner wall of the main valve body 16 at a position corresponding to the upper portion of the sealing step 19, and an impact-resistant sleeve 32 is threadedly connected to the internal thread portion 31. The inner wall of the main valve body 16 corresponding to the position above the sealing step 19 is most strongly impacted by the medium at the opening moment of the main valve assembly 1, so that the main valve assembly is most easily affected by scouring and cavitation, and the impact-resistant sleeve 32 is arranged to protect the main valve body 16, so that the service life of the valve is further prolonged.

Claims

1. The cavitation erosion prevention minimum flow valve comprises a main valve component (1) and a bypass component (2), wherein the bypass component (2) comprises a bypass valve body (3), a controller cover (4), a bypass bushing (5), a bypass valve rod (6) and a bypass valve core (7), the controller cover (4) and the bypass bushing (5) are installed in the bypass valve body (3), the bypass valve rod (6) penetrates through the controller cover (4), and the bypass valve rod (6) is in linkage connection with the bypass valve core (7); the method is characterized in that: the bypass valve is characterized in that a plurality of pressure reducing flanges (8) are uniformly arranged on the outer periphery of the bypass valve core (7) along the axial direction, a plurality of valve seat flanges (9) which are used for forming sealing fit with the pressure reducing flanges (8) are uniformly arranged on the inner periphery of the bypass bushing (5) along the axial direction, when the pressure reducing flanges (8) are abutted against the corresponding valve seat flanges (9), a medium in the bypass valve body (3) is blocked, and when the pressure reducing flanges (8) are separated from the corresponding valve seat flanges (9), a pressure reducing flow channel (10) is formed between the bypass valve core (7) and the bypass bushing (5).

2. The anti-cavitation minimum flow valve of claim 1, wherein: and a screw rod part (11) is arranged at one end of the bypass valve rod (6) close to the bypass valve core (7), and a screw hole (12) matched with the screw rod part (11) is formed in the bypass valve core (7).

3. The anti-cavitation minimum flow valve of claim 2, wherein: bypass subassembly (2) still include pretension spring (13), the one end that bypass valve rod (6) are close to bypass case (7) is equipped with first spring groove (14), the one end that bypass case (7) are close to bypass valve rod (6) is equipped with second spring groove (15), pretension spring (13) cover is established screw rod portion (11) periphery, and the both ends of pretension spring (13) inlay respectively and establish in first spring groove (14) and second spring groove (15).

4. The anti-cavitation minimum flow valve of claim 1, wherein: the main valve component (1) comprises a main valve body (16), a main valve core (17) and an eccentric rod (18), wherein the main valve core (17) is arranged in the main valve body (16) in a sliding manner, a sealing step (19) which is used for abutting against the main valve core (17) and forming sealing fit is arranged in the main valve body (16), the eccentric rod (18) is hinged with the main valve body (16), one end of the eccentric rod (18) abuts against the main valve core (17), and the other end of the eccentric rod (18) abuts against the bypass valve rod (6); the controller is characterized in that a sliding cavity (20) is arranged in the controller cover (4), a first piston part (21) attached to the inner periphery of the sliding cavity (20) is arranged on the bypass valve rod (6), and a second piston part (22) attached to the inner periphery of the sliding cavity (20) is arranged on the bypass valve core (7).

5. The anti-cavitation minimum flow valve of claim 4, wherein: install first supporting disk (23) and second supporting disk (24) in the main valve body (16), install guide arm (25) on first supporting disk (23), be equipped with on main valve case (17) and supply spring chamber (26) that guide arm (25) stretched into, be equipped with main valve spring (27) in spring chamber (26), main valve spring (27) one end offsets with guide arm (25) lower extreme, and the other end of main valve spring (27) offsets with the lower extreme in spring chamber (26), be equipped with on second supporting disk (24) with main valve case (17) lower extreme matched with guide hole (28).

6. The anti-cavitation minimum flow valve of claim 5, wherein: the lower end of the spring cavity (26) is provided with a first positioning groove (29), the lower end of the guide rod (25) is provided with a second positioning groove (30), and two ends of the main valve spring (27) are embedded in the first positioning groove (29) and the second positioning groove (30) respectively.

7. The anti-cavitation minimum flow valve of claim 4, wherein: the inner wall of the main valve body (16) is provided with an internal thread part (31) corresponding to the position above the sealing step (19), and the internal thread part (31) is connected with an impact-resistant sleeve (32) through threads.