Sleeve type drain valve with small hole throttling double-sealing structure

Abstract

The utility model discloses a drain valve with a sleeve type small hole throttling double-sealing structure, belongs to the technical field of valves, and aims to overcome the defects of the conventional drain valve. Comprising a valve body, a throttling sleeve abuts against a valve seat structure up and down, a plurality of throttling hole sets are formed in the throttling sleeve in the axial direction, the periphery of a valve clack is in sliding fit with the inner periphery of the throttling sleeve so as to open or shield the throttling hole sets, and the lower end of a valve rod downwards stretches into the throttling sleeve and is connected with the valve clack. Pressure reduction is carried out through the multiple throttling hole sets, cavitation, flash evaporation and other conditions are avoided, when the opening degree is small, when the valve clack shields the multiple throttling hole sets, large solid particles can be prevented from entering the sealing position between the valve clack and the valve seat structure, the flow speed of a medium in the fit clearance between the valve clack and the throttling sleeve is maximum, and the sealing effect is good. Therefore, a sealing pair formed by the first sealing conical surface and the second sealing conical surface can be prevented from being scoured by a high-speed medium, and the service life of the valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field, especially relate to a sleeve type small hole throttling double seal structure's trap. BACKGROUND

[0002] The existing trap generally adopts simple stop valve structure, because of using working condition valve before post pressure difference is big, temperature is high, working medium can produce cavitation, flash evaporation etc. imagination in the trap process, make valve parts extremely easy to damage, shorten valve service life, valve because big pressure difference reason produces vibration and noise. Meanwhile, because the working medium of trap is generally dirty, can contain particulate impurities, damage sealing surface. CONTENT

[0003] The utility model discloses a sleeve type small hole throttling double seal structure's trap to solve the deficiency of the existing trap.

[0004] A sleeve type small hole throttling double seal structure's trap, including valve body, valve clapper and valve rod, the valve body is equipped with valve cavity and lower flow path, and the upper opening and right opening of valve body are communicated through valve cavity, and the left opening of valve body is communicated with valve cavity through lower flow path, and the lower flow path is stacked with valve seat structure, and the inner periphery top of valve seat structure is equipped with first sealing conical surface, and throttling sleeve is up and down with valve seat structure, and the outer periphery top of throttling sleeve is with the upper opening diameter cooperation of valve body, and the outer periphery of throttling sleeve and the lateral wall of valve cavity are equipped with working gap, and the top of throttling sleeve is equipped with a plurality of balance holes, and a plurality of throttling hole groups are axially set up on throttling sleeve, and a plurality of throttling hole groups are in valve cavity, and the outer periphery of valve clapper and the inner periphery of throttling sleeve are slidingly fitted to open or shield a plurality of throttling hole groups, and the guide sleeve is connected with valve body through a plurality of support rods, and the upper end of valve rod passes through guide sleeve upwards, and the lower end of valve rod is explored into throttling sleeve, and is connected with valve clapper, and the upper opening of valve rod and valve body are slidingly sealed with packing assembly, and the outer periphery lower end of valve clapper is equipped with second sealing conical surface, and the first sealing conical surface and second sealing conical surface abut and seal or separate.

[0005] Further, the packing gland and the packing sleeve are sleeved on the valve rod, the packing gland is connected with the valve body through the screw rod, the packing gland presses the packing assembly on the throttling sleeve through the packing sleeve, the upper end surface of the packing sleeve is a convex spherical surface, a taper table groove is formed on the lower end surface of the packing gland, and the inclined surface of the taper table groove is tangent to the convex spherical surface.

[0006] Further, the upper end surface of the valve clapper is provided with a reverse T-shaped slot which is formed with an opening penetrating to one side, and the lower end of the valve rod is provided with a reverse T-shaped connecting structure which enters and exits the reverse T-shaped slot through the opening.

[0007] Further, the upper opening outer periphery of the valve body is provided with a connecting flange, the guide sleeve is connected with the connecting flange through the plurality of supporting rods, and the packing gland is connected with the connecting flange through a screw rod, the connecting flange is threadedly connected with the valve body, and is welded to prevent retreat.

[0008] Further, the valve rod is provided with a guide key, and the valve rod and the guide sleeve are circumferentially limited through the guide key.

[0009] Compared with the prior art, the beneficial effects of the utility model are that:

[0010] 1. The drain valve is installed on the pipeline through a flange or other ways, when the drain valve is opened, the medium backflow enters the valve cavity through the right opening of the valve body, the medium is first sprayed from the periphery of the throttling sleeve to the inside of the throttling sleeve, pressure reduction is carried out through a plurality of throttling hole groups, and cavitation, flashing and other conditions are avoided, meanwhile, due to the drop of medium pressure, vibration and noise generation can also be effectively inhibited.

[0011] 2. In the initial stage of closing of the drain valve, the valve disc is in a small opening state, the valve disc slides downward to block a plurality of throttling hole groups, large solid particles can be prevented from entering the sealing place between the valve disc and the valve seat structure, the medium still flows to the medium outlet through the cooperation gap formed between the valve disc and the throttling sleeve, the flow rate of the medium in the cooperation gap reaches the maximum, so that the sealing pair composed of the first sealing cone surface and the second sealing cone surface can be prevented from being washed by high-speed medium, and the service life of the valve is improved. Meanwhile, when the medium flows between the valve disc and the valve seat structure, the first sealing cone surface and the second sealing cone surface can also be swept, small particle dirt is avoided from adhering, and self-cleaning of the sealing pair is realized.

[0012] 3. The packing gland and the packing sleeve ring are tangent, the stress of the packing assembly can be prevented from being uneven, and reliable sealing between the valve rod and the valve body can be realized.

[0013] 4. The valve disc and the valve rod are separately made, material waste in processing is avoided, and quick detachable connection is realized.

[0014] 5. The connecting flange and the valve body are separately made, material waste in processing is avoided, and reliable connection is realized.

[0015] 6. The axial sliding fit and the circumferential limiting fit between the valve rod and the guide sleeve are realized through the guide key, and the structure is simple and the implementation cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structural schematic view of the utility model;

[0017] Fig. 2 It is a sectional view of the valve body;

[0018] Fig. 3 It is a sectional view of the throttling sleeve;

[0019] Fig. 4 is a sectional view of the valve disc;

[0020] Fig. 5 is a sectional view of the packing gland;

[0021] Fig. 6 is a sectional view of the packing sleeve.

[0022] In the drawings, 1. valve body, 2. valve disc, 3. throttling sleeve, 4. valve stem, 5. guide key, 6. guide sleeve, 7. packing gland, 8. packing sleeve, 9. connecting flange, 10. packing assembly, 11. valve cavity, 12. valve seat structure, 13. balance hole, 14. throttling hole group, 15. inverted T-shaped groove, 16. second sealing conical surface, 17. conical frustum sunken groove, 18. convex spherical surface. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will describe the utility model through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary, and not to limit the scope of the utility model. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0024] The connection mentioned in the utility model is divided into fixed connection and detachable connection, the fixed connection is namely non-detachable connection including but not limited to edge folding connection, rivet connection, cementing connection and welding connection and other conventional fixed connection modes, the detachable connection includes but is not limited to bolt connection, buckle connection, pin connection and hinge connection and other conventional detachable modes, when not explicitly limited to specific connection mode, at least one connection mode to realize the function can be found in the existing connection mode, and the person skilled in the art can select it according to the needs. For example: fixed connection selects welding connection, detachable connection selects bolt connection.

[0025] The utility model will be further described in detail in combination with the drawings, the following embodiments are the explanation of the utility model, and the utility model is not limited to the following embodiments.

[0026] Embodiment: as Figs. 1-6As shown, a sleeve type small hole throttling double seal structure hydrophobic valve, including valve body 1, valve 2 and valve stem 4, valve body 1 is provided with valve cavity 11 and lower flow path, the upper opening and right opening of valve body 1 is communicated through valve cavity 11, the right opening of valve body 1 is medium inlet, the left opening of valve body 1 is communicated with valve cavity 11 through the lower flow path, the left opening of valve body 1 is medium outlet, the lower flow path is stacked with valve seat structure 12, the inner circumferential top of valve seat structure 12 is provided with first sealing cone surface, throttling sleeve 3 is in contact with valve seat structure 12 up and down, the outer circumferential top of throttling sleeve 3 is matched with the upper opening pass of valve body 1, the outer circumferential of throttling sleeve 3 and the side wall of valve cavity 11 is provided with working gap, the top of throttling sleeve 3 is provided with several balance holes 13, the several balance holes 13 and the medium inlet are provided with flow gap, the throttling sleeve 3 is provided with several throttling hole groups 14 along the axial direction, each throttling hole group 14 is composed of several circumferentially uniform circular hole groups, several throttling hole groups 14 are in valve cavity 11, the outer circumferential of valve 2 and the inner circumferential of throttling sleeve 3 are slidingly matched, to open or shield several throttling hole groups 14, guide sleeve 6 is connected with valve body 1 through several support rods, the upper end of valve stem 4 passes through guide sleeve 6 upwards, the lower end of valve stem 4 probes into throttling sleeve 3 downwards, and is connected with valve 2, valve stem 4 and the upper opening of valve body 1 are slidingly sealed and matched through packing assembly 10, the outer circumferential lower end of valve 2 is provided with second sealing cone surface 16, the first sealing cone surface and second sealing cone surface 16 are in contact or separated.

[0027] The hydrophobic valve is installed on the pipeline through flange or other ways, when the hydrophobic valve is opened, medium backflow enters valve cavity 11 from the right opening of valve body 1, medium is first injected from the periphery of throttling sleeve 3 to the inside of throttling sleeve 3, depressurization is carried out through several throttling hole groups 14, cavitation, flashing and other conditions are avoided, at the same time, due to the drop of medium pressure, vibration and noise generation can also be effectively inhibited. In the initial stage of the closing of the hydrophobic valve, valve 2 is in small opening state, valve 2 slides downwards to shield several throttling hole groups 14, can hinder larger solid particles from entering the sealing part between valve 2 and valve seat structure 12, medium still flows to medium outlet through the cooperation gap between valve 2 and throttling sleeve 3, the flow rate of medium in the cooperation gap reaches the maximum, so that the sealing pair composed of the first sealing cone surface and second sealing cone surface 16 can be avoided from being washed by high-speed medium, the service life of the valve is improved. At the same time, when the medium flows between valve 2 and valve seat structure 12, the first sealing cone surface and second sealing cone surface 16 also play a sweeping role, avoid small particle dirt from adhering, realize the self-cleaning of the sealing pair, finally the first sealing cone surface and second sealing cone surface 16 are in contact, the valve is closed, and the medium is blocked.

[0028] The packing gland 7 and the packing sleeve 8 are sleeved on the valve stem 4, the packing gland 7 is connected with the valve body 1 through a screw rod, the packing gland 7 presses the packing assembly 10 on the throttling sleeve 3 through the packing sleeve 8, the upper end surface of the packing sleeve 8 is a convex spherical surface 18, the lower end surface of the packing gland 7 is provided with a conical groove 17, and the inclined surface of the conical groove 17 is tangent to the ring line of the convex spherical surface 18. The packing gland 7 and the packing sleeve 8 are tangent to the ring line, so that the packing assembly 10 is prevented from being unevenly stressed, and reliable sealing between the valve stem 4 and the valve body 1 is realized.

[0029] The upper end surface of the valve disc 2 is provided with a reverse T-shaped groove 15 formed by penetrating an opening to one side, and the lower end of the valve stem 4 is provided with a reverse T-shaped connecting structure which enters and exits the reverse T-shaped groove 15 through the opening. In this way, the valve disc 2 and the valve stem 4 are separately manufactured, material waste is avoided, and quick detachable connection is realized.

[0030] The upper opening of the valve body 1 is provided with a connecting flange 9, the guide sleeve 6 is connected with the connecting flange 9 through a plurality of supporting rods, the packing gland 7 is connected with the connecting flange 9 through a screw rod, the connecting flange 9 is threadedly connected with the valve body 1 and is welded to prevent retreat. In this way, the connecting flange 9 and the valve body 1 are separately manufactured, material waste is avoided, and reliable connection is realized.

[0031] The valve stem 4 is provided with a guide key 5, and the valve stem 4 is circumferentially limited by the guide key 5. The guide key 5 is used to realize axial sliding fit and circumferential limiting fit between the valve stem 4 and the guide sleeve 6, and the structure is simple and the implementation cost is low.

[0032] The above examples are only exemplary descriptions of the present application and do not limit the protection scope thereof, and a person skilled in the art can also change parts of them, as long as the spirit and essence of the present application are not exceeded, and the present application is within the protection scope.

Claims

1. A hydrophobic valve of a sleeve type small orifice throttling double seal structure, characterized by: The valve comprises a valve body (1), a valve disc (2) and a valve stem (4), the valve body (1) is provided with a valve cavity (11) and a lower flow path, the upper opening and the right opening of the valve body (1) are communicated through the valve cavity (11), the left opening of the valve body (1) is communicated with the valve cavity (11) through the lower flow path, the lower flow path is provided with a valve seat structure (12) by surfacing welding, the inner circumferential top end of the valve seat structure (12) is provided with a first sealing cone surface, a throttling sleeve (3) is in abutment with the valve seat structure (12) upward and downward, the outer circumferential top end of the throttling sleeve (3) is matched with the upper opening pass of the valve body (1), a working gap is arranged between the outer circumferential of the throttling sleeve (3) and the side wall of the valve cavity (11), the top of the throttling sleeve (3) is provided with a plurality of balance holes (13), a plurality of throttling hole groups (14) are arranged on the throttling sleeve (3) in the axial direction, the plurality of throttling hole groups (14) are arranged in the valve cavity (11), the outer circumferential of the valve disc (2) is in sliding fit with the inner circumferential of the throttling sleeve (3) to open or shield the plurality of throttling hole groups (14), a guide sleeve (6) is connected with the valve body (1) through a plurality of supporting rods, the upper end of the valve stem (4) penetrates the guide sleeve (6) upward, the lower end of the valve stem (4) penetrates into the throttling sleeve (3) downward and is connected with the valve disc (2), the valve stem (4) is in sliding sealing fit with the upper opening of the valve body (1) through a packing assembly (10), the outer circumferential lower end of the valve disc (2) is provided with a second sealing cone surface (16), the first sealing cone surface and the second sealing cone surface (16) are in abutment sealing or separation.

2. A hydrophobic valve of the sleeve and orifice throttling double seal type according to claim 1, characterized in that: The packing gland (7) and the packing sleeve (8) are sleeved on the valve stem (4), the packing gland (7) is connected with the valve body (1) through a screw rod, the packing sleeve (8) presses the packing assembly (10) on the throttling sleeve (3) through the packing gland (7), the upper end face of the packing sleeve (8) is a convex spherical surface (18), the lower end face of the packing gland (7) is provided with a conical platform groove (17), the inclined surface of the conical platform groove (17) is tangent to the ring line of the convex spherical surface (18).

3. A hydrophobic valve of the sleeve and orifice throttling double seal type according to claim 2, characterized in that: The upper end face of the valve disc (2) is provided with a reverse T-shaped slot (15) which is formed by penetrating to one side to form an opening, the lower end of the valve stem (4) is provided with a reverse T-shaped connecting structure, the reverse T-shaped connecting structure enters and exits the reverse T-shaped slot (15) through the opening.

4. A hydrophobic valve of the sleeve and orifice throttling double seal type according to claim 3, characterized in that: The upper opening outer circumferential of the valve body (1) is provided with a connecting flange (9), the guide sleeve (6) is connected with the connecting flange (9) through a plurality of supporting rods, the packing gland (7) is connected with the connecting flange (9) through a screw rod, the connecting flange (9) is threadedly connected with the valve body (1) and is welded to prevent retreat.

5. A hydrophobic valve of the sleeve and orifice restrictive double seal type according to any one of claims 1 to 4, characterized in that: The valve stem (4) is provided with a guide key (5), the valve stem (4) and the guide sleeve (6) are circumferentially limited by the guide key (5).

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