Stop valve with high sealing performance

Abstract

The utility model discloses a stop valve with strong sealing performance, which comprises a valve body, a valve cover fixedly connected with the upper end of the valve body, a valve seat integrally connected with the inside of the valve body, and a valve core abutted against the valve seat, a valve rod penetrating through the valve cover is fixedly connected with a hand wheel, and the valve rod is fixedly connected with the valve cover through threads. The upper end of the valve element is movably connected with the lower end of the valve rod through a first movable part, the positions, located at the lower end of the valve cover and the upper end of the valve element, of the valve rod are sequentially provided with a sealing plate face and a center block from top to bottom, the sealing plate face is movably connected with the valve rod through a second movable part, and the center block is fixedly connected with the valve rod. Sealing springs are arranged outside the valve rod and located between the sealing plate face and the center block and between the center block and the valve element in a sleeving mode. The sealing structure is provided with a sealing surface protection structure, and the sealing performance is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field more particularly is a kind of stop valve with strong sealing performance. BACKGROUND

[0002] Stop valve is a kind of valve, also be called as cut-off valve, belongs to forced sealing type valve, by exerting pressure to make valve clapper sealing surface and valve seat sealing surface closely adhere, to prevent the flow of medium. Therefore, the sealing performance of stop valve is particularly important.

[0003] In prior art, the application number 93206030.7 of a kind of leakage-proof stop valve, by placing horizontal steel in the two sides of structure beam column, then installing fluorine plastic or high-strength anticorrosive rubber sealing pad on the valve head and valve stem of stop valve, or sleeve sealing sleeve, form the flexible sealing surface of valve head, valve stem and the rigid sealing surface of valve body contact, utilize the hardness of flexible material is small, pressure resistance wear resistance, and increase the sealing property of stop valve. However, the utility model still has the following problems: stop valve does not have sealing surface protection structure, stop valve repeatedly opens, and will lead to sealing surface wear, when sealing surface wears, medium will directly leak, therefore the utility model provides a kind of stop valve with strong sealing performance. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of stop valve with strong sealing performance, the utility model has sealing surface protection structure, and sealing performance is strong.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of stop valve with strong sealing performance, including valve body, the valve cover fixedly connected with the upper end of valve body, the valve seat integrally connected with the inside of valve body, the valve core with the valve seat, the valve stem fixedly connected with hand wheel, the valve stem is penetrated, the packing seal part is equipped between the upper end of the valve cover and the valve stem, the valve stem is equipped with screw surface, the valve stem is fixed by screw connection with the valve cover, the upper end of the valve core is movably connected with the lower end of the valve stem by movable part one, the valve stem is sequentially equipped with sealing plate surface and center block from top to bottom in the lower end of valve cover and the upper end of valve core, the sealing plate surface is movably connected with the valve stem by movable part two, the center block is fixedly connected with the valve stem, the valve stem is equipped with sealing spring between the sealing plate surface and center block and the center block and valve core, the sealing spring is fixedly connected with corresponding sealing plate surface, center block and valve core, the lower end of the valve core is fixedly equipped with sealing inner block and sealing outer block corresponding to the inside and the outside of the valve seat, the outside of the sealing inner block and the inside of the sealing outer block are respectively abutted with the two sides of valve seat.

[0007] Using the above technical scheme, the utility model has the following advantages:

[0008] The utility model discloses the setting of sealing plate surface, valve core, sealing inner block and sealing outer block makes when the valve stem moves down, can drive valve core, sealing inner block and sealing outer block and valve body and valve seat are opposite, effectively realize the sealing between valve seat and valve core, can effectively prevent medium leakage, when the valve stem moves up, can drive sealing plate surface and move up and valve body and valve cover are opposite, effectively realize the sealing between valve stem, valve cover and valve body, can effectively prevent medium leakage, the utility model discloses the setting of sealing spring, movable part one and movable part two makes when the valve stem drive valve core moves down to the bottom, and valve core can be further moved down by the elastic force of sealing spring, when the valve stem drive sealing plate surface moves up to the top, and sealing plate surface can be further moved up by the elastic force of sealing spring, thereby strengthening the sealing performance of the utility model, preventing the valve core and valve seat or sealing plate surface wear and produce gap, medium directly leaks, and sealing spring can further protect the sealing surface.

[0009] Further, the packing seal portion includes a packing seal cover, a spring portion, and a sealing packing, an inner ring groove is provided on the inner side of the upper end of the valve cover, the sealing packing is fixedly provided in the inner ring groove, the spring portion is provided on the upper end of the sealing packing, a push plate is fixedly provided on the lower end of the packing seal cover corresponding to the position of the inner ring groove, the lower end of the push plate is inserted into the inner ring groove and abuts against the spring portion, and the packing seal cover is fixedly connected with the valve cover through a plurality of bolts.

[0010] By adopting the above technical scheme, the utility model has the following advantages:

[0011] The push plate is provided, so that when the utility model is used, the sealing performance of the sealing packing will be invalid after being subjected to pressure for a long time, and there is a gap between the valve stem and the valve cover, therefore, the bolts can be further tightened regularly, the sealing packing can be further in close contact with the valve stem and the valve cover to realize sealing, the service life of the sealing packing can be effectively prolonged, and the sealing performance of the utility model is strengthened.

[0012] Further, the spring portion includes end plates at the upper end and the lower end, and a high-elasticity spring is fixedly provided between the end plates.

[0013] By adopting the above technical scheme, the utility model has the following advantages:

[0014] The end plates and the high-elasticity spring are provided, so that the elastic force of the high-elasticity spring can push the end plates to extrude the sealing packing, and the sealing performance between the sealing packing and the valve cover and the valve stem is further strengthened.

[0015] Further, the movable part one includes a sliding block one, a top groove is provided on the upper end of the valve core, the lower end of the valve stem is inserted into the top groove, side grooves one are provided on the two sides of the top groove in communication, the sliding block one is fixedly provided on the lower end of the valve stem corresponding to the positions of the side grooves one, and the sliding block one is clamped in the corresponding side groove one and can move up and down.

[0016] The utility model discloses have following advantages by adopting above technical scheme:

[0017] The utility model discloses the setting of slider one and side groove one makes the valve core can move up and down in the lower end certain range of valve stem, thereby when the sealing surface between valve core and valve seat wears, the valve core can continuously move down, continues to realize the sealing.

[0018] Further, the movable part two includes a slider two, the valve stem penetrates the sealing plate face, the sealing plate face is located in the both sides of the valve stem and is provided with a side groove two, the valve stem is fixedly provided with a slider two at the position corresponding to the side groove two, and the slider two is clamped in the corresponding side groove two and can move up and down.

[0019] The utility model discloses have following advantages by adopting above technical scheme:

[0020] The utility model discloses the setting of slider two and side groove two makes the sealing plate face can move up and down in the upper end certain range of valve stem, thereby when the sealing surface between sealing plate face and valve cover wears, the sealing plate face can continuously move up, continues to realize the sealing.

[0021] Further, the upper end of the sealing plate face is fixedly provided with an elastic sealing surface.

[0022] The utility model discloses have following advantages by adopting above technical scheme:

[0023] The utility model discloses the setting of elastic sealing surface can further improve the sealing performance between valve cover, valve stem and valve body.

[0024] Further, the sealing inner block is surrounded by an annular side groove, the annular side groove is fixedly provided with a sealing ring, the annular side groove is communicated with a plurality of spring grooves, the spring grooves are fixedly provided with inner springs, and the inner side of the sealing ring is abutted by the inner springs away from the spring grooves.

[0025] The utility model discloses have following advantages by adopting above technical scheme:

[0026] The utility model discloses the setting of inner spring and sealing ring makes the elastic force of inner spring can push the sealing ring and the inner side of valve seat close contact, thereby strengthens the sealing performance of sealing inner block and valve seat, can effectively prevent medium leakage.

[0027] Further, the valve body is provided with a clasp groove corresponding to the position of the sealing outer block, the clasp groove is fixedly provided with an annular sealing ring, the upper end of the annular sealing ring is provided with a top clamping groove, and the lower end of the sealing outer block is clamped in the corresponding top clamping groove.

[0028] The utility model discloses have following advantages by adopting above technical scheme:

[0029] The annular sealing ring of this invention enhances the sealing performance between the sealing outer block and the valve body, effectively preventing media leakage. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention in its unopened state;

[0032] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention in its open state;

[0033] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0034] Figure 4 This utility model Figure 1 Enlarged structural diagram at point B;

[0035] Figure 5 This utility model Figure 2 Enlarged structural diagram at point D;

[0036] Figure 6 This utility model Figure 1 Enlarged structural diagram at point C.

[0037] Reference numerals: 1. Valve body; 101. Snap ring groove; 2. Valve core; 201. Top groove; 202. Side groove one; 3. Valve cover; 301. Inner annular groove; 4. Packing seal cover; 401. Push plate; 5. Valve stem; 501. Threaded surface; 6. Annular sealing ring; 601. Top snap groove; 7. Inner sealing block; 701. Annular side groove; 702. Spring groove; 8. End plate; 801. High-elasticity spring; 9. Sealing plate surface; 901. Side groove two; 10. Handwheel; 11. Valve seat; 12. Inner spring; 13. Outer sealing block; 14. Sealing ring; 15. Slider one; 16. Slider two; 17. Center block; 18. Sealing spring; 19. Sealing packing; 20. Elastic sealing surface. Detailed Implementation

[0038] like Figure 1 , Figure 2 and Figure 4As shown in this specific embodiment, a gate valve with strong sealing performance includes a valve body 1, a valve cover 3 fixedly connected to the upper end of the valve body 1, a valve seat 11 integrally connected to the valve body 1, a valve core 2 abutting against the valve seat 11, a valve stem 5 penetrating the valve cover 3 and fixedly connected to a handwheel 10, a packing seal between the upper end of the valve cover 3 and the valve stem 5, a threaded surface 501 on the valve stem 5, and the valve stem 5 and the valve cover 3 are fixedly connected by threads. The upper end of the valve core 2 is movably connected to the lower end of the valve stem 5 through a movable part. The valve stem 5 is located at the lower end of the valve cover 3 and the upper end of the valve core 2 from top to bottom. The valve core 2 is provided with a sealing plate 9 and a center block 17. The sealing plate 9 is movably connected to the valve stem 5 through a movable part 2. The center block 17 is fixedly connected to the valve stem 5. Sealing springs 18 are sleeved on the valve stem 5 between the sealing plate 9 and the center block 17 and between the center block 17 and the valve core 2. The sealing springs 18 are fixedly connected to the corresponding sealing plate 9, center block 17 and valve core 2 respectively. The lower end of the valve core 2 is fixedly provided with an inner sealing block 7 and an outer sealing block 13 on the inner and outer sides of the valve seat 11 respectively. The outer side of the inner sealing block 7 and the inner side of the outer sealing block 13 abut against the two sides of the valve seat 11 respectively.

[0039] Through the above configuration, the sealing plate 9, valve core 2, inner sealing block 7, and outer sealing block 13 of this utility model are arranged such that when the valve stem 5 moves downward, it can drive the valve core 2, inner sealing block 7, and outer sealing block 13 to abut against the valve body 1 and valve seat 11, effectively achieving a seal between the valve seat 11 and valve core 2, and effectively preventing media leakage. When the valve stem 5 moves upward, it can drive the sealing plate 9 to move upward and abut against the valve body 1 and valve cover 3, effectively achieving a seal between the valve stem 5, valve cover 3, and valve body 1, and effectively preventing media leakage. The arrangement of the sealing spring 18, movable part one, and movable part two allows the valve core 2 to move further downward under the elastic force of the sealing spring 18 when the valve stem 5 moves the valve core 2 to the bottom. When the valve stem 5 moves the sealing plate 9 to the top, the sealing plate 9 can move further upward under the elastic force of the sealing spring 18. This enhances the sealing performance of the present invention and prevents direct leakage of the medium when gaps are created due to wear between the valve core 2 and the valve seat 11 or the sealing plate 9. The sealing spring 18 can further protect the sealing surface.

[0040] like Figure 3 As shown, the packing seal includes a packing seal cover 4, a spring part, and a sealing packing 19. The valve cover 3 has an inner ring groove 301 on the inner side of its upper end. The sealing packing 19 is fixedly installed in the inner ring groove 301. The sealing packing 19 has a spring part at its upper end. The packing seal cover 4 has a push plate 401 fixedly installed at its lower end corresponding to the position of the inner ring groove 301. The lower end of the push plate 401 is inserted into the inner ring groove 301 and abuts against the spring part. The packing seal cover 4 and the valve cover 3 are fixedly connected by several bolts. The spring part includes end plates 8 at the upper and lower ends. A high-elasticity spring 801 is fixedly installed between the end plates 8.

[0041] With the above configuration, the push plate 401 of this utility model ensures that when the sealing packing 19 is subjected to pressure for a long time, its sealing performance will fail and there will be gaps between the valve stem 5 and the valve cover 3. Therefore, the bolts can be tightened periodically to make the sealing packing 19 make closer contact with the valve stem 5 and the valve cover 3 to achieve a seal, which can effectively extend the service life of the sealing packing 19 and enhance the sealing performance of this utility model. The end plate 8 and the high-elasticity spring 801 of this utility model enable the elasticity of the high-elasticity spring 801 to push the end plate 8 to squeeze the sealing packing 19, further enhancing the sealing performance between the sealing packing 19 and the valve cover 3 and the valve stem 5.

[0042] like Figure 4 to Figure 5 As shown, the movable part one includes a slider 15, the upper end of the valve core 2 is provided with a top groove 201, the lower end of the valve stem 5 is inserted into the top groove 201, the two sides of the top groove 201 are provided with side grooves 202, the lower end of the valve stem 5 is fixedly provided with sliders 15 at the positions corresponding to the side grooves 202, and sliders 15 are locked in the corresponding side grooves 202 and can move up and down; the movable part two includes a slider 2 16, the valve stem 5 passes through the sealing plate surface 9, the sealing plate surface 9 is provided with side grooves 2 901 at the positions corresponding to the valve stem 5, sliders 2 16 are fixedly provided on the valve stem 5 at the positions corresponding to the side grooves 2 901, and sliders 2 16 are locked in the corresponding side grooves 2 901 and can move up and down; the upper end of the sealing plate surface 9 is fixedly provided with an elastic sealing surface 20.

[0043] Through the above configuration, the slider 15 and side groove 202 of this utility model allow the valve core 2 to move up and down within a certain range at the lower end of the valve stem 5. Thus, when the sealing surface between the valve core 2 and the valve seat 11 is worn, the valve core 2 can continue to move downwards to maintain the seal. The slider 16 and side groove 901 of this utility model allow the sealing plate 9 to move up and down within a certain range at the upper end of the valve stem 5. Thus, when the sealing surface between the sealing plate 9 and the valve cover 3 is worn, the sealing plate 9 can continue to move upwards to maintain the seal. The elastic sealing surface 20 of this utility model can further improve the sealing performance between the valve cover 3, the valve stem 5, and the valve body 1.

[0044] like Figure 6 As shown, the inner sealing block 7 is surrounded by an annular side groove 701, and a sealing ring 14 is fixedly installed in the annular side groove 701. Several spring grooves 702 are connected in the annular side groove 701, and an inner spring 12 is fixedly installed in each spring groove 702. The side of the inner spring 12 away from the spring groove 702 abuts against the inner side of the sealing ring 14. The valve body 1 is provided with a retaining ring groove 101 at the position corresponding to the outer sealing block 13. An annular sealing ring 6 is fixedly installed in the retaining ring groove 101. The upper end of the annular sealing ring 6 is provided with a top retaining groove 601, and the lower end of the outer sealing block 13 is engaged in the corresponding top retaining groove 601.

[0045] With the above settings, the inner spring 12 and the sealing ring 14 of this utility model enable the elastic force of the inner spring 12 to push the sealing ring 14 into close contact with the inner side of the valve seat 11, thereby strengthening the sealing performance between the inner sealing block 7 and the valve seat 11 and effectively preventing media leakage; the annular sealing ring 6 of this utility model strengthens the sealing performance between the outer sealing block 13 and the valve body 1 and effectively prevents media leakage.

[0046] Working principle: During use, when media flow is required, the valve stem 5 can be rotated by turning the handwheel 10. This allows the threaded surface 501 of the valve stem 5 to rotate upwards and move against the inner side of the valve cover 3. This, in turn, causes the slider 15, the center block 17, and the slider 2 16 to move upwards. The upward movement of slider 15 and slider 2 16 allows them to move to the upper ends of the side groove 1 202 and side groove 2 901, respectively. This, in turn, causes the valve core 2 and the sealing plate 9 to move upwards until the elastic sealing surface 20 at the upper end of the sealing plate 9 abuts against the lower end of the valve cover 3, thereby strengthening the connection between the valve cover 3 and the valve stem 5. The sealing effect between the valve core 1 and the valve body 1 effectively prevents medium leakage. At this time, the slider 2 16 is located at the upper end of the side groove 2 901. The lower end of the side groove 2 901 has a certain cavity. The elastic force of the sealing spring 18 between the center block 17 and the sealing plate surface 9 can further push the sealing plate surface 9 upward to fit tightly against the valve cover 3, thereby further increasing the sealing performance between the valve cover 3, the valve body 1, and the valve stem 5. Since the valve core 2 is separated from the valve seat 11, the medium can flow at this time. When it is necessary to stop the flow of the medium, the handwheel 10 is turned in the reverse direction, which can drive the valve stem. 5 moves downward, thereby causing slider 15, center block 17, and slider 2 16 to move downward, which in turn causes valve core 2 and sealing plate 9 to move downward. When the lower end of valve core 2 abuts against valve seat 11, valve stem 5 can continue to move downward until slider 15 moves to the lower end of side groove 202. The outer sealing block 13 is engaged in the annular sealing ring 6, and the inner sealing block 7 is engaged between valve seats 11, achieving effective sealing between valve core 2 and valve seat 11 and preventing media flow. At this time, slider 15 is located at the lower end of side groove 202, and the upper end of side groove 202 has a certain amount of space. The elastic force of the sealing spring 18 between the cavity, the central block 17 and the valve core 2 can further push the valve core 2 downward to make close contact with the valve seat 11, thereby further strengthening the sealing performance between the valve seat 11 and the valve core 2. During the use of this utility model, the bolts at the upper end of the packing seal cover 4 need to be tightened regularly, so that the push plate 401 pushes the spring part downward, so that the sealing packing 19 is further compacted and makes close contact with the valve cover 3 and the valve stem 5, achieving effective sealing of the valve cover 3 and the valve stem 5, extending the service life of the sealing packing 19 and reducing the number of times it needs to be replaced.

[0047] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A gate valve with strong sealing performance, comprising a valve body (1), a valve cover (3) fixedly connected to the upper end of the valve body (1), a valve seat (11) integrally connected to the inside of the valve body (1), a valve core (2) abutting against the valve seat (11), a valve stem (5) penetrating the valve cover (3) and fixedly connected to a handwheel (10), characterized in that, The upper end of the valve cover (3) is provided with a packing seal part, the valve rod (5) is provided with a threaded surface (501), the valve rod (5) is fixedly connected with the valve cover (3) through thread connection, the upper end of the valve core (2) is movably connected with the lower end of the valve rod (5) through movable part one, the valve rod (5) is sequentially provided with a sealing plate surface (9) and a center block (17) from top to bottom at the lower end of the valve cover (3) and the upper end of the valve core (2), the sealing plate surface (9) is movably connected with the valve rod (5) through movable part two, the center block (17) is fixedly connected with the valve rod (5), the valve rod (5) is sleeved with a sealing spring (18) between the sealing plate surface (9) and the center block (17) and between the center block (17) and the valve core (2), the sealing spring (18) is fixedly connected with the corresponding sealing plate surface (9), center block (17) and valve core (2) respectively, the lower end of the valve core (2) is fixedly provided with a sealing inner block (7) and a sealing outer block (13) corresponding to the inner side and the outer side of the valve seat (11) respectively, and the outer side of the sealing inner block (7) and the inner side of the sealing outer block (13) abut against both sides of the valve seat (11) respectively.

2. The sealing performance strong stop valve according to claim 1, wherein The packing seal part comprises a packing seal cover (4), a spring part and a sealing packing (19), the upper end of the valve cover (3) is provided with an inner ring groove (301), the inner ring groove (301) is fixedly provided with a sealing packing (19) inside, the upper end of the sealing packing (19) is provided with a spring part, the lower end of the packing seal cover (4) is fixedly provided with a push plate (401) corresponding to the position of the inner ring groove (301), the lower end of the push plate (401) is inserted into the inner ring groove (301) and abuts against the spring part, and the packing seal cover (4) is fixedly connected with the valve cover (3) through a plurality of bolts.

3. The sealingly strong stop valve according to claim 2, wherein The spring part comprises end plates (8) at the upper and lower ends, and a high-elastic spring (801) is fixedly arranged between the end plates (8).

4. The sealing performance strong stop valve according to claim 1, wherein The movable part one comprises a sliding block one (15), the upper end of the valve core (2) is provided with a top groove (201), the lower end of the valve rod (5) is inserted into the top groove (201), the two sides of the top groove (201) are provided with side grooves one (202) in communication, the lower end of the valve rod (5) is fixedly provided with a sliding block one (15) corresponding to the position of the side groove one (202), and the sliding block one (15) is clamped in the corresponding side groove one (202) and can move up and down.

5. The sealingly strong stop valve according to claim 4, wherein The movable part two comprises a sliding block two (16), the valve rod (5) penetrates the sealing plate surface (9), the two sides of the valve rod (5) are provided with side grooves two (901) in communication inside the sealing plate surface (9), the valve rod (5) is fixedly provided with a sliding block two (16) corresponding to the position of the side groove two (901), and the sliding block two (16) is clamped in the corresponding side groove two (901) and can move up and down.

6. The sealingly strong stop valve according to claim 5, wherein The upper end of the sealing plate surface (9) is fixedly provided with an elastic sealing surface (20).

7. The sealingly strong stop valve according to claim 1, wherein The sealing inner block (7) is provided with an annular side groove (701), an sealing ring (14) is fixedly arranged in the annular side groove (701), a plurality of spring grooves (702) are communicated in the annular side groove (701), and an inner spring (12) is fixedly arranged in each spring groove (702), and the inner spring (12) is in abutment with the inner side of the sealing ring (14) away from the spring groove (702).

8. The tight sealing shut-off valve according to claim 7, wherein The valve body (1) is provided with a snap ring groove (101) corresponding to the position of the sealing outer block (13), an annular sealing ring (6) is fixedly arranged in the snap ring groove (101), and a top snap groove (601) is arranged at the upper end of the annular sealing ring (6), and the lower end of the sealing outer block (13) is clamped in the corresponding top snap groove (601).

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