Recirculation minimum flow valve for feed pump

Abstract

The utility model discloses a recirculation minimum flow valve for a feed pump, which comprises a valve casing, the upper end of the inner cavity of the valve casing is fixedly connected with a valve seat, the bottom of the inner cavity of the valve seat is fixedly connected with an annular sealing seat, the top of the annular sealing seat is fixedly connected with a first stellite alloy ring and a second stellite alloy ring in sequence from outside to inside, and the first stellite alloy ring and the second stellite alloy ring are fixedly connected with the valve casing. And the upper end of the inner cavity of the valve seat is movably connected with an adjusting column. Under the matching action of the valve rod, the valve shell, the adjusting column, the main valve element, the pressure applying spring, the auxiliary valve element, the second wedge-shaped groove, the annular sealing seat, the second stellite alloy ring, the first wedge-shaped groove, the first stellite alloy ring and the valve seat, the dual-sealing effect can be achieved in the valve closing process; and the first stellite alloy ring and the second stellite alloy ring have good abrasion resistance, so that the surface damage can be avoided under the long-time impact erosion of water flow, and the sealing performance of the whole long-term use is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely is a kind of recirculation minimum flow valve for water supply pump. BACKGROUND

[0002] The recirculation minimum flow valve for water supply pump is one of important regulating valves applied in high-pressure water supply system of power plant, and the minimum flow valve used in current large power plant reduces pressure by sleeve gradually, and it guarantees valve sealing by double sealing structure of soft and hard, and soft sealing can achieve good sealing effect in initial stage, but soft sealing is continuously subjected to steam and water scouring with time elapsing, especially for peak-shaving unit with frequent start and stop, sealing surface is particularly serious, and sealing performance of soft sealing greatly decreases, steam and water easily accelerate the scouring of hard sealing, thereby causing valve internal leakage, and secondly, due to unreasonable design of balance sealing ring and valve core sealing surface, it easily causes problems of excessive closing force of valve or valve internal leakage in actual use. SUMMARY

[0003] The utility model discloses a kind of recirculation minimum flow valves for water supply pump, with greatly improve the sealing performance of valve, effectively strengthen the scouring resistance, reduce maintenance frequency advantage.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of recirculation minimum flow valve for water supply pump, including valve shell, the upper end of the valve shell inner chamber is fixedly connected with valve seat, the bottom of the valve seat inner chamber is fixedly connected with annular sealing seat, the top of the annular sealing seat is sequentially fixedly connected with first stellite alloy ring and second stellite alloy ring from outside to inside, the upper end of the valve seat inner chamber is movably connected with adjusting column, the top of the adjusting column is sleeved with valve stem, the surface of the valve stem is screw-connected in the middle end of valve shell top, the lower end of the adjusting column is fixedly connected with main valve core, the outer surface of the main valve core is movably connected in the middle end of the valve seat inner chamber, the bottom of the main valve core is provided with first wedge-shaped groove, the lower end of the main valve core inner chamber is movably connected with auxiliary valve core, the bottom of the auxiliary valve core is provided with second wedge-shaped groove, and the periphery between the bottom of the auxiliary valve core top and the periphery of adjusting column is fixedly connected with pressure spring.

[0005] As preferred scheme, the upper end of the adjusting column is fixedly installed with first piston ring, the surface of the first piston ring is movably connected in the upper end of the valve seat inner chamber, the upper end of the adjusting column and below the first piston ring are fixedly installed with first high-temperature fluorine rubber O-shaped ring, and the surface of the first high-temperature fluorine rubber O-shaped ring is movably connected in the upper end of the valve seat inner chamber.

[0006] As a preferred scheme, the upper end of the outer surface of the main valve core is fixedly provided with a second high-temperature fluororubber O-shaped ring, the surface of the second high-temperature fluororubber O-shaped ring is movably connected to the middle end of the inner cavity of the valve seat, and the lower end of the inner cavity of the valve seat is fixedly provided with a second piston ring, and the outer surface of the main valve core is movably connected to the surface of the second piston ring.

[0007] As a preferred scheme, the middle end of the auxiliary valve core is fixedly provided with a third high-temperature fluororubber O-shaped ring, the number of the third high-temperature fluororubber O-shaped ring is two, the surface of the third high-temperature fluororubber O-shaped ring is movably connected to the lower end of the inner cavity of the main valve core, and the upper end of the auxiliary valve core is fixedly provided with a third piston ring, and the surface of the third piston ring is movably connected to the middle end of the inner cavity of the main valve core.

[0008] As a preferred scheme, the periphery of the adjusting column is threadedly connected with a guide column, and the surface of the auxiliary valve core is movably connected to the lower end of the guide column.

[0009] As a preferred scheme, the bottom of the outer surface of the valve seat is fixedly connected with a main pressure regulating sleeve, the surface of the main pressure regulating sleeve is provided with a first pressure regulating hole, the outer surface of the main pressure regulating sleeve is fixedly connected with a secondary pressure regulating sleeve, and the surface of the secondary pressure regulating sleeve is provided with a second pressure regulating hole.

[0010] As a preferred scheme, the upper end of the right side of the valve shell is fixedly connected with a water inlet pipe, and the lower end of the left side of the valve shell is fixedly connected with a water outlet pipe.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1、The utility model discloses a valve rod, a valve shell, an adjusting column, a main valve core, a pressure spring, an auxiliary valve core, a second wedge groove, a ring seal seat, a second stellite alloy ring, a first wedge groove, a first stellite alloy ring and a valve seat cooperate, can realize the effect of double sealing in the process of closing the valve, and because the first stellite alloy ring and the second stellite alloy ring all have good anti -erosion performance, can avoid surface damage under the long -term impact of water flow, thereby ensuring the sealing performance of long -term use, and because the first wedge groove on the bottom of the main valve core is in the form of reverse buckling relative to the direction of water flow, the surface of the first wedge groove is directly washed by water body when the valve is small, the probability of damage of the surface of the first wedge groove is reduced, and the sealing performance of the reverse buckling sealing form can be kept stable in the long -term use of the valve, and the frequency of maintenance or replacement is reduced.

[0013] 2、The utility model discloses through the setting of first piston ring and first high temperature fluorine rubber O -ring, can form double -walled sealing effect between the adjusting column and valve seat, effectively improved the sealing property of contact between adjusting column and valve seat, avoid the whole use process from the valve seat and the leakage of adjusting column, through the setting of second high temperature fluorine rubber O -ring and second piston ring, can form double -walled sealing effect between main valve core and valve seat, effectively improved the sealing property of contact between main valve core and valve seat, avoid the whole use process from the main valve core and the leakage of valve seat, through the setting of third high temperature fluorine rubber O -ring and third piston ring, can form double -walled sealing effect between main valve core and vice valve core, effectively improved the sealing property of contact between main valve core and vice valve core, avoid the whole use process from the main valve core and the leakage of vice valve core, through the setting of guide column, reach the purpose of guiding vice valve core, and avoid vice valve core from falling off in the process of using.

[0014] 3、The utility model discloses through the setting of main pressure regulating sleeve, vice pressure regulating sleeve, first pressure regulating hole and second pressure regulating hole, can under the action of personnel valve, make the pressure of high -pressure side can gradually guide low -pressure side, effectively reduced the pressure difference of both sides in the process of closing valve, thereby avoid the pressure difference to be too big and cause greater impact to main valve core and vice valve core, through the setting of inlet pipe and outlet pipe, can connect between water pump pipeline and drainage pipeline respectively. ACCURACY OF DRAWINGS

[0015] Figure 1 It is the perspective drawing of the utility model;

[0016] Figure 2 It is the valve shell cross section structure schematic view of the utility model;

[0017] Figure 3 It is the main valve core cross section structure schematic view of the utility model;

[0018] Figure 4 It is the A place local enlarged view in the utility model Figure 2

[0019] In the drawing: 1, valve housing;2, outlet pipe;3, valve stem;4, inlet pipe;5, first piston ring;6, first high temperature fluorine rubber O -ring;7, adjusting column;8, main valve core;9, valve seat;10, second high temperature fluorine rubber O -ring;11, second piston ring;12, vice pressure regulating sleeve;13, main pressure regulating sleeve;14, first wedge groove;15, second wedge groove;16, vice valve core;17, third high temperature fluorine rubber O -ring;18, third piston ring;19, guide column;20, pressure spring;21, first Stellite alloy ring;22, second Stellite alloy ring;23, annular sealing seat. DETAILED DESCRIPTION

[0020] ​Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts under the premise that no creative efforts are made, belong to the scope of protection of the present application.

[0021] Secondly, the "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive of other embodiments.

[0022] Embodiment one:

[0023] Please refer to Figures 1-4 As shown in the drawing, the utility model provides a minimum flow valve for water supply pump with recirculation, including valve housing 1, the upper end fixed connection of valve housing 1 inner chamber has valve seat 9, the bottom fixed connection of valve seat 9 inner chamber has annular sealing seat 23, the top of annular sealing seat 23 is fixedly connected with first stellite alloy ring 21 and second stellite alloy ring 22 from outside to inside in proper order, the top of adjusting column 7 is sleeved with valve stem 3, the surface of valve stem 3 is connected in the middle end of valve housing 1 top by screw thread, the lower end of adjusting column 7 is fixedly connected with main valve core 8, the outer surface of main valve core 8 is movably connected in the middle end of valve seat 9 inner chamber, the bottom of main valve core 8 is provided with first wedge slot 14, the lower end of main valve core 8 inner chamber is movably connected with auxiliary valve core 16, the bottom of auxiliary valve core 16 is provided with second wedge slot 15, and the periphery between the bottom of auxiliary valve core 16 top and adjusting column 7 is fixedly connected with pressure spring 20.

[0024] In the technical scheme, through the cooperation between valve stem 3, valve housing 1, adjusting column 7, main valve core 8, pressure spring 20, auxiliary valve core 16, second wedge slot 15, annular sealing seat 23, second stellite alloy ring 22, first wedge slot 14, first stellite alloy ring 21 and valve seat 9, the effect of double sealing can be realized in the process of closing the valve, and since first stellite alloy ring 21 and second stellite alloy ring 22 both have good corrosion resistance, the surface can be prevented from being damaged under the long-term impact and erosion of water flow, so that the sealing performance of long-term use is ensured, and since the first wedge slot 14 at the bottom of main valve core 8 adopts a reverse buckle form relative to the direction of water flow, the surface of first wedge slot 14 is effectively prevented from being directly washed by water when the valve has a small opening, the probability of damage to the surface of first wedge slot 14 is reduced, and the stable sealing performance of the reverse buckle sealing form can be maintained in the long-term use of the valve, so that the frequency of maintenance or replacement is reduced.

[0025] Example 2:

[0026] Based on Embodiment 1, this utility model is as follows: Figure 2 and Figure 3 As shown, a first piston ring 5 is fixedly installed on the upper end of the adjusting column 7, and the surface of the first piston ring 5 is movably connected to the upper end of the inner cavity of the valve seat 9. A first high-temperature fluororubber O-ring 6 is fixedly installed on the upper end of the adjusting column 7 and below the first piston ring 5, and the surface of the first high-temperature fluororubber O-ring 6 is movably connected to the upper end of the inner cavity of the valve seat 9. A second high-temperature fluororubber O-ring 10 is fixedly installed on the upper end of the outer surface of the main valve core 8, and the surface of the second high-temperature fluororubber O-ring 10 is movably connected to the middle end of the inner cavity of the valve seat 9. A second piston ring 1 is fixedly installed on the lower end of the inner cavity of the valve seat 9. 1. The outer surface of the main valve core 8 is movably connected to the surface of the second piston ring 11. The middle end of the auxiliary valve core 16 is fixedly installed with a third high-temperature fluororubber O-ring 17. There are two third high-temperature fluororubber O-rings 17. The surface of the third high-temperature fluororubber O-ring 17 is movably connected to the lower end of the inner cavity of the main valve core 8. The upper end of the auxiliary valve core 16 is fixedly installed with a third piston ring 18. The surface of the third piston ring 18 is movably connected to the middle end of the inner cavity of the main valve core 8. The adjusting column 7 is threaded with guide columns 19 around its perimeter. The surface of the auxiliary valve core 16 is movably connected to the lower end of the guide columns 19.

[0027] In this technical solution, the first piston ring 5 and the first high-temperature fluororubber O-ring 6 form a double sealing effect between the regulating column 7 and the valve seat 9, effectively improving the sealing performance between the regulating column 7 and the valve seat 9 and preventing water leakage between the valve seat 9 and the regulating column 7 during use. Similarly, the second high-temperature fluororubber O-ring 10 and the second piston ring 11 form a double sealing effect between the main valve core 8 and the valve seat 9, further improving the sealing performance and preventing water leakage. The third high-temperature fluororubber O-ring 17 and the third piston ring 18 form a double sealing effect between the main valve core 8 and the auxiliary valve core 16, also improving the sealing performance and preventing water leakage. Finally, the guide column 19 guides the auxiliary valve core 16 and prevents it from falling off during use.

[0028] Example 3:

[0029] Based on Embodiment 1, this utility model is as follows: Figure 1 and Figure 2As shown, the bottom of the outer surface of the valve seat 9 is fixedly connected with a main pressure regulating sleeve 13, the surface of the main pressure regulating sleeve 13 is provided with a first pressure regulating hole, the outer surface of the main pressure regulating sleeve 13 is fixedly connected with a secondary pressure regulating sleeve 12, the surface of the secondary pressure regulating sleeve 12 is provided with a second pressure regulating hole, the upper end of the right side of the valve housing 1 is fixedly connected with a water inlet pipe 4, and the lower end of the left side of the valve housing 1 is fixedly connected with a water outlet pipe 2.

[0030] In the technical scheme, the main pressure regulating sleeve 13, the secondary pressure regulating sleeve 12, the first pressure regulating hole and the second pressure regulating hole are arranged, so that the pressure on the high-pressure side can be gradually guided to the low-pressure side under the action of closing the valve, thereby effectively reducing the pressure difference generated on both sides during the closing process of the valve, so that the pressure difference is not too large to cause a large impact on the main valve core 8 and the secondary valve core 16, and the water inlet pipe 4 and the water outlet pipe 2 are arranged to be connected with the water pump pipeline and the drainage pipeline, respectively.

[0031] The working principle of the utility model is: when personnel need to close the valve, the valve rod 3 is rotated and moved downward along the surface of the valve housing 1, which can drive the adjusting column 7, the main valve core 8, the pressure spring 20 and the secondary valve core 16 to move downward, under the action of continuous movement, the second wedge-shaped groove 15 at the bottom of the secondary valve core 16 can be in contact with the second Stellite ring 22 on the annular sealing seat 23 in advance, and under the pushing of the compression tension of the pressure spring 20, the second wedge-shaped groove 15 can be tightly attached to the surface of the second Stellite ring 22, so that the water flow between the valve housing 1 and the valve seat 9 can be initially intercepted, and under the action of continuous movement of the main valve core 8, the first wedge-shaped groove 14 at the bottom of the main valve core 8 can be tightly attached to the surface of the first Stellite ring 21 on the annular sealing seat 23, so that the water flow between the valve housing 1 and the valve seat 9 can be further intercepted, thereby realizing the effect of double sealing during the closing process of the valve, and because the first Stellite ring 21 and the second Stellite ring 22 have good corrosion resistance, the surface can be prevented from being damaged under the long-term impact of the water flow, thereby ensuring the sealing performance of long-term use, and because the first wedge-shaped groove 14 at the bottom of the main valve core 8 is in the form of reverse buckling relative to the direction of the water flow, the surface of the first wedge-shaped groove 14 can be effectively prevented from being directly washed by the water body at a small opening of the valve, the probability of damage to the surface of the first wedge-shaped groove 14 is reduced, and the sealing performance of the reverse buckling sealing form can be maintained stable during the long-term use of the valve, thereby reducing the frequency of maintenance or replacement.

[0032] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model, and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently, and does not deviate from the essence and scope of the technical scheme of the utility model.

Claims

1. A recirculation minimum flow valve for a water supply pump comprising a valve housing (1), characterized in that: The upper end of the inner cavity of the valve shell (1) is fixedly connected with a valve seat (9), the bottom of the inner cavity of the valve seat (9) is fixedly connected with an annular sealing seat (23), the top of the annular sealing seat (23) is sequentially fixedly connected with a first Stellite ring (21) and a second Stellite ring (22) from outside to inside, the upper end of the inner cavity of the valve seat (9) is movably connected with an adjusting column (7), the top of the adjusting column (7) is sleeved with a valve stem (3), the surface of the valve stem (3) is screwedly connected to the middle end of the top of the valve shell (1), the lower end of the adjusting column (7) is fixedly connected with a main valve core (8), the outer surface of the main valve core (8) is movably connected to the middle end of the inner cavity of the valve seat (9), the bottom of the main valve core (8) is provided with a first wedge-shaped groove (14), the lower end of the inner cavity of the main valve core (8) is movably connected with a secondary valve core (16), the bottom of the secondary valve core (16) is provided with a second wedge-shaped groove (15), and the periphery of the top of the secondary valve core (16) and the periphery of the bottom of the adjusting column (7) are fixedly connected with a pressure spring (20).

2. A recirculation minimum flow valve for a water supply pump according to claim 1, characterized in that: The upper end of the adjusting column (7) is fixedly installed with a first piston ring (5), the surface of the first piston ring (5) is movably connected to the upper end of the inner cavity of the valve seat (9), and the upper end of the adjusting column (7) and below the first piston ring (5) are fixedly installed with a first high-temperature fluorine rubber O-shaped ring (6), and the surface of the first high-temperature fluorine rubber O-shaped ring (6) is movably connected to the upper end of the inner cavity of the valve seat (9).

3. A recirculation minimum flow valve for a water supply pump according to claim 1, characterized in that: The upper end of the outer surface of the main valve core (8) is fixedly installed with a second high-temperature fluorine rubber O-shaped ring (10), the surface of the second high-temperature fluorine rubber O-shaped ring (10) is movably connected to the middle end of the inner cavity of the valve seat (9), the lower end of the inner cavity of the valve seat (9) is fixedly installed with a second piston ring (11), and the outer surface of the main valve core (8) is movably connected to the surface of the second piston ring (11).

4. A recirculation minimum flow valve for a water pump as set forth in claim 1, characterized in that: The middle end of the secondary valve core (16) is fixedly installed with a third high-temperature fluorine rubber O-shaped ring (17), the number of the third high-temperature fluorine rubber O-shaped ring (17) is two, the surface of the third high-temperature fluorine rubber O-shaped ring (17) is movably connected to the lower end of the inner cavity of the main valve core (8), and the upper end of the secondary valve core (16) is fixedly installed with a third piston ring (18), and the surface of the third piston ring (18) is movably connected to the middle end of the inner cavity of the main valve core (8).

5. A recirculation minimum flow valve for a water pump as defined in claim 1, characterized in that: The periphery of the adjusting column (7) is screwedly connected with a guide column (19), and the surface of the secondary valve core (16) is movably connected to the lower end of the guide column (19).

6. A recirculation minimum flow valve for a water pump as defined in claim 1, characterized in that: The bottom of the outer surface of the valve seat (9) is fixedly connected with a main pressure regulating sleeve (13), the surface of the main pressure regulating sleeve (13) is provided with a first pressure regulating hole, the outer surface of the main pressure regulating sleeve (13) is fixedly connected with a secondary pressure regulating sleeve (12), and the surface of the secondary pressure regulating sleeve (12) is provided with a second pressure regulating hole.

7. A recirculation minimum flow valve for a water pump as defined in claim 1, characterized in that: The upper end of the right side of the valve shell (1) is fixedly connected with a water inlet pipe (4), and the lower end of the left side of the valve shell (1) is fixedly connected with a water outlet pipe (2).

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