Hard sealing upward expanding valve

Abstract

The utility model particularly relates to a hard sealing upward expanding valve, which is characterized in that a limiting part at the end part of a valve rod is limited in a valve core through a connecting screw sleeve, so that the linkage matching of the valve rod and the valve core during lifting is realized, and meanwhile, due to the existence of adjusting gaps between a first groove part and the limiting part and between the connecting screw sleeve and the valve rod, the integrated structure of the valve rod and the valve core is eliminated; in the closing process of the valve, the valve element can conduct self-centering sealing according to the position of the valve seat so as to correct errors caused in the assembling or machining process, five-stage to six-stage sealing can be achieved without grinding the valve element and the valve seat, and the labor cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of discharge valves, in particular to a hard-sealed upward expansion valve. Background Art

[0002] The upward discharge valve, also called upward discharge valve for short, is installed at the bottom of reactors, storage tanks and other containers for discharging. It is widely used in chemical, petroleum, metallurgy, pharmaceutical, pesticide, dye, food processing and other industries.

[0003] like Figure 1-2 The figure shows an existing conventional upward-expanding discharge valve, including a valve body 1', a valve stem 2', a valve core 3', and a valve seat 4'. The valve body 1' is provided with a discharge port 11' on the side, the discharge port 11' is tilted downward and communicated with the inside of the valve body 1', the valve seat 4' is fixedly arranged at the upper end inlet of the valve body 1' through an upper flange 5', the valve stem 2' is located in the central flow channel of the valve body 1', the top of the valve stem 2' is threadedly connected to the valve core 3', the valve stem 2' drives the valve core 3' to move up and down, and the part of the valve core 3' can fit with the valve seat 4' to form a seal. Among them, due to the integrated connection structure formed by the valve core 3' and the valve stem 2', the valve core cannot adaptively adjust the position of the valve seat, so that the processing accuracy requirements of the valve core and the valve seat are relatively high, and it is often necessary to grind the valve core and the valve seat to achieve the effect of five to six levels of sealing. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a hard-sealed upward expansion valve.

[0005] The technical solution adopted by the utility model is as follows: a hard-sealed upward expansion valve, comprising a valve body, a valve stem, a valve core, and a valve seat. A discharge port is provided on the side of the valve body, the discharge port is inclined downward and communicated with the interior of the valve body, and the valve seat is fixedly arranged at the inlet of the upper end of the valve body through an upper flange.

[0006] The valve stem is concentrically provided with a limit portion at its upper end, and a connecting screw sleeve is sleeved below the limit portion of the valve stem. A mounting groove is provided at the bottom of the valve core, and the mounting groove includes, from top to bottom, a first groove portion adapted to the shape of the limit portion and a second threaded hole portion that forms a threaded fixed fit with the connecting screw sleeve. The lower end of the limit portion abuts against the upper end of the connecting screw sleeve and is limited in the first groove portion.

[0007] The inner hole diameter of the connecting screw sleeve is larger than the valve stem diameter, and the first groove portion is larger than the size of the limiting portion, so that there is an adjustment gap between the inner periphery of the first groove portion and the outer periphery of the limiting portion, and between the inner periphery of the connecting screw sleeve and the outer periphery of the valve stem.

[0008] Preferably, the limiting portion includes a limiting block connected to the top of the valve stem and a guide hemisphere connected to the top center of the limiting block, and the plane at the top of the limiting block and the hemispherical surface of the guiding hemisphere constitute the upper end surface of the limiting portion.

[0009] Preferably, the connecting screw sleeve includes, from top to bottom, a threaded portion that forms a threaded fit with the second threaded hole portion and an abutting portion whose outer diameter is larger than the threaded portion and whose upper end surface abuts against the lower end surface of the valve core.

[0010] Preferably, a bracket is connected to the bottom of the valve body, a first limit assembly is arranged between the bracket and the valve stem, and the valve stem is provided with a limit hole extending in its radial direction.

[0011] The first limiting assembly includes a limiting rod radially penetrated on the bracket and adapted to the shape of the limiting hole. The limiting rod moves axially relative to the limiting hole and has a first locking position that penetrates into the limiting hole to limit the lifting and lowering movement of the valve stem and a first working position that leaves the limiting hole.

[0012] Preferably, the bracket is provided with a mounting channel along its radial direction, which is adapted to the size of the limiting plug rod and through which one end of the limiting plug rod passes.

[0013] The first limiting assembly also includes a first abutment plate connected to the end of the limiting rod away from the limiting hole and having a size larger than the diameter of the installation channel, a second abutment plate fixed to the bracket and arranged parallel to the first abutment plate, and a first elastic element limited between the first abutment plate and the second abutment plate.

[0014] The first abutment plate and the limiting insertion rod are provided with a guide channel along their axial direction, a first guide rod which is adapted to the shape of the first abutment plate and forms a sliding fit is provided in the guide channel, one end of the first guide rod is fixedly connected to the second abutment plate, and the first elastic element is sleeved on the outer periphery of the first guide rod;

[0015] The limiting rod is provided with a limiting installation groove along its radial direction, and a second limiting assembly is connected in the limiting installation groove, and the second limiting assembly includes a positioning block, and the positioning block moves to have a first retracted position completely located in the limiting installation groove and a first positioning position where one end is located outside the limiting installation groove.

[0016] When the limit rod is located at the first locking position, the first abutment plate abuts against the outer periphery of the bracket, and the positioning block is located at the first contraction position. When the limit rod is located at the first working position, the positioning block is located at the first positioning position and abuts against the outer periphery of the bracket.

[0017] Preferably, the second limiting assembly also includes a sliding plate and a second elastic element, the sliding plate is slidably connected to the inner cavity of the limiting installation groove, the locking block is fixedly connected to the bottom end of the sliding plate, and both ends of the second elastic element are respectively abutted against the sliding plate and the limiting installation groove.

[0018] Preferably, the limiting installation groove includes, from bottom to top, a first connecting groove adapted to the size of the locking block and a second connecting groove adapted to the size of the sliding plate and slidably matched. The size of the first connecting groove is smaller than the second connecting groove and forms a first limiting step between the two.

[0019] Preferably, the limiting mounting groove also includes a third connecting groove connected above the second connecting groove and smaller in size than the second connecting groove, a second limiting step is formed between the second connecting groove and the third connecting groove, and a second guide rod that is adapted to the size of the third connecting groove and slidably matched is fixed to the end of the sliding plate away from the locking block, and the second elastic element is sleeved outside the second guide rod and its two ends respectively abut against the second limiting step and the sliding plate.

[0020] Preferably, the limiting hole radially passes through the valve stem, and two groups of the first limiting components are provided and symmetrically distributed on both sides of the valve stem.

[0021] The beneficial effects of the utility model are as follows: the limiting part at the end of the valve stem is limited within the valve core by the connecting sleeve, thereby realizing the linkage cooperation between the valve stem and the valve core when they are lifted and lowered; at the same time, due to the existence of the adjustment gap between the first groove and the limiting part, and between the connecting sleeve and the valve stem, the integrated structure of the valve stem and the valve core is eliminated, so that during the valve closing process, the valve core will perform self-centering sealing according to the position of the valve seat to correct the error caused by the assembly or processing process, and five to six levels of sealing can be achieved without grinding the valve core and valve seat, thereby greatly reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0023] Figure 1 This is a front view structural diagram of an existing conventional upward expansion valve;

[0024] Figure 2 for Figure 1 A magnified view of the structure at center;

[0025] Figure 3 This is a front view structural diagram of the embodiment of the utility model when the limit rod is located at the first locking position and the positioning block is located at the first retracted position;

[0026] Figure 4 for Figure 3 A magnified view of the structure at B in the middle;

[0027] Figure 5This is a front view structural diagram of the embodiment of the utility model when the limit rod is located at the first working position and the locking block is located at the first locking position;

[0028] Figure 6 for Figure 3 A magnified view of the structure at C in the middle;

[0029] Figure 7 for Figure 5 A magnified view of the structure at D in the middle;

[0030] Figure 8 for Figure 6 Enlarged view of the structure at E in the middle;

[0031] In the figure, 1, valve body; 2, valve stem; 3, valve core; 4, valve seat; 5, upper flange; 6, connecting screw sleeve; 7, bracket; 11, discharge port; 21, limiting portion; 22, limiting hole; 31, mounting groove; 61, threaded portion; 62, abutment portion; 71, mounting channel; 81, limiting plug rod; 82, first abutment plate; 83, second abutment plate; 84, first elastic element; 85, first guide rod; 91, positioning block; 92, sliding plate; 93, second elastic element; 94, second guide rod; 211, limiting block; 212, guide hemisphere; 311, first groove portion; 312, second threaded hole portion; 811, first connecting groove; 812, second connecting groove; 813, third connecting groove; 814, first limiting step; 815, second limiting step. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0033] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0034] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0035] like Figures 1 to 8As shown in the figure, in the embodiment of the utility model, a hard-sealed upward expansion valve comprises a valve body 1, a valve stem 2, a valve core 3, and a valve seat 4. A discharge port 11 is provided on the side of the valve body 1, and the discharge port 11 is inclined downward and communicated with the interior of the valve body 1. The valve seat 4 is fixedly arranged at the inlet of the upper end of the valve body 1 through an upper flange 5.

[0036] The valve stem 2 is concentrically provided with a limiting portion 21 at its upper end, and a connecting screw sleeve 6 is sleeved below the limiting portion 21 of the valve stem 2. A mounting groove 31 is provided at the bottom of the valve core 3. The mounting groove 31 includes, from top to bottom, a first groove portion 311 that matches the shape of the limiting portion 21 and a second threaded hole portion 312 that forms a threaded fixed fit with the connecting screw sleeve 6. The lower end of the limiting portion 21 abuts against the upper end of the connecting screw sleeve 6 and is limited in the first groove portion 311.

[0037] The inner hole diameter of the connecting screw sleeve 6 is larger than the diameter of the valve stem 2 , and the first groove 311 is larger than the size of the limiting portion 21 , so that there is an adjustment gap between the inner periphery of the first groove 311 and the outer periphery of the limiting portion 21 , and between the inner periphery of the connecting screw sleeve 6 and the outer periphery of the valve stem 2 .

[0038] With this arrangement, the limiting portion at the end of the valve stem is limited within the valve core by the connecting sleeve, thereby realizing the linkage coordination between the valve stem and the valve core during lifting and lowering. At the same time, due to the existence of the adjustment gap between the first groove and the limiting portion, and between the connecting sleeve and the valve stem, the integrated structure of the valve stem and the valve core is eliminated, so that during the valve closing process, the valve core will perform self-centering sealing according to the position of the valve seat to correct errors caused by the assembly or processing process. Fifth to sixth level sealing can be achieved without grinding the valve core and valve seat, thereby greatly reducing labor costs.

[0039] The limiting portion 21 includes a limiting block 211 connected to the top of the valve stem 2 and a guide hemisphere 212 connected to the top center of the limiting block 211 . The plane at the top of the limiting block 211 and the hemispherical surface of the guide hemisphere 212 constitute the upper end surface of the limiting portion 21 .

[0040] Through this arrangement, the upper end surface of the limit part is composed of the top plane of the limit block and the hemispherical surface of the guide hemisphere. Compared with the matching form of a single plane or an arc surface, the guide hemisphere has a certain guiding effect in the self-centering process of the valve core, which further improves the self-centering effect of the valve core. At the same time, the smooth surface of the hemisphere reduces the wear during the contact between it and the valve core; the plane on the top of the limit block ensures the stability of the matching between the valve core and the valve stem during the opening and closing of the valve.

[0041] The connecting screw sleeve 6 includes, from top to bottom, a threaded portion 61 threadedly matched with the second threaded hole portion 312 and an abutting portion 62 whose outer diameter is larger than the threaded portion 61 and whose upper end surface abuts against the lower end surface of the valve core 3 .

[0042] With this arrangement, the abutment portion is conducive to the installation of the connecting screw sleeve in place. At the same time, when installed in place, it forms a surface-to-surface abutment with the valve core, thereby improving the stability of the connection between the two during the opening process of the valve.

[0043] The bottom of the valve body 1 is connected to a bracket 7, a first limiting assembly is arranged between the bracket 7 and the valve stem 2, and the valve stem 2 is provided with a limiting hole 22 extending along its radial direction.

[0044] The first limiting assembly includes a limiting rod 81 radially penetrated on the bracket 7 and adapted to the shape of the limiting hole 22. The limiting rod 81 moves axially relative to the limiting hole 22 and has a first locking position that penetrates into the limiting hole 22 to limit the lifting and lowering movement of the valve stem 2 and a first working position that leaves the limiting hole 22.

[0045] With this arrangement, the lifting and lowering movement of the valve stem can be restricted by the movement of the limit rod, thereby preventing the valve from opening due to misoperation of the valve stem in a non-working state.

[0046] The bracket 7 is provided with a mounting channel 71 along its radial direction, which is adapted to the size of the limiting plug rod 81 and through which one end of the limiting plug rod 81 passes.

[0047] The first limiting assembly also includes a first abutment plate 82 connected to the end of the limiting rod 81 away from the limiting hole 22 and having a size larger than the diameter of the installation channel 71, a second abutment plate 83 fixed to the bracket 7 and arranged parallel to the first abutment plate 82, and a first elastic element 84 limited to the first abutment plate 82 and the second abutment plate 83.

[0048] The first abutment plate 82 and the limiting insertion rod 81 are provided with a guide channel along their axial direction, and a first guide rod 85 matching the shape and forming a sliding fit is provided in the guide channel, one end of the first guide rod 85 is fixedly connected to the second abutment plate 83, and the first elastic element 84 is sleeved on the outer periphery of the first guide rod 85;

[0049] The limiting rod 81 is provided with a limiting installation groove along its radial direction, and a second limiting assembly is connected in the limiting installation groove, and the second limiting assembly includes a positioning block 91, and the positioning block 91 moves to have a first retracted position completely located in the limiting installation groove and a first positioning position where one end is located outside the limiting installation groove.

[0050] When the limiting rod 81 is located at the first locking position, the first abutment plate 82 abuts against the outer periphery of the bracket 7, and the positioning block 91 is located at the first contracted position. When the limiting rod 81 is located at the first working position, the positioning block 91 is located at the first positioning position and abuts against the outer periphery of the bracket 7.

[0051] This arrangement makes operation convenient and locking / unlocking stable. When the valve stem needs to be unlocked, the first abutment plate is moved to drive the limit rod to move to the first working position in the direction of compressing the first elastic element, and the positioning block moves to the first positioning position against the outer periphery of the bracket to limit the movement of the limit rod toward the limiting hole, so that the valve can be opened and closed normally; when the valve stem needs to be locked, the positioning block is moved to the first contracted position, and the limit rod moves to the first locking position in the direction of the limiting hole under the action of the reset force of the first elastic element, and the first abutment plate is against the outer periphery of the bracket to form a stable fit between the limit rod and the installation channel.

[0052] The first elastic element is specifically configured as a spring component, and the second limiting component is configured at a position on the limiting plug rod different from the guide channel, and the two do not interfere with each other.

[0053] The second limiting assembly also includes a sliding plate 92 and a second elastic element 93. The sliding plate 92 is slidably connected to the inner cavity of the limiting installation groove. The locking block 91 is fixedly connected to the bottom end of the sliding plate 92. Both ends of the second elastic element 93 are respectively abutted against the sliding plate 92 and the limiting installation groove.

[0054] This arrangement further improves the convenience and stability of the locking / unlocking operation. Pressing the blocking block in the direction of compressing the second elastic element can place the blocking block in the first retracted position, thereby releasing the movement restriction on the limit rod; and when the first abutment plate is moved to drive the limit rod to move to the first working position, the blocking block will move downward to the first blocking position under the action of the restoring force of the second elastic element, thereby restricting the movement of the limit rod. The second elastic element is specifically configured as a spring member.

[0055] The limiting installation groove includes, from bottom to top, a first connecting groove 811 adapted to the size of the locking block 91 and a second connecting groove 812 adapted to the size of the sliding plate 92 and slidably matched. The size of the first connecting groove 811 is smaller than the second connecting groove 812 and a first limiting step 814 is formed between the two.

[0056] Through this arrangement, the first and second connecting grooves improve the stability of the movement of the positioning block and the sliding plate, and the first limiting step formed between the two can prevent the sliding plate from falling out.

[0057] The limiting mounting groove also includes a third connecting groove 813 connected above the second connecting groove 812 and smaller in size than the second connecting groove 812. A second limiting step 815 is formed between the second connecting groove 812 and the third connecting groove 813. A second guide rod 94 that is adapted to the size of the third connecting groove 813 and slidably matched is fixed to the end of the sliding plate 92 away from the locking block 91. The second elastic element 93 is sleeved on the outside of the second guide rod 94 and its two ends respectively abut against the second limiting step 815 and the sliding plate 92.

[0058] Through this arrangement, the cooperation between the second guide rod and the third connecting groove further improves the stability of the movement process of the structure.

[0059] The limiting hole 22 radially passes through the valve stem 2 , and two groups of the first limiting components are provided and symmetrically distributed on both sides of the valve stem 2 .

[0060] This arrangement improves the stability of the valve stem limit and prevents the valve stem from being eccentric during the lifting and lowering process.

[0061] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A hard-sealed expansion valve, comprising a valve body (1), a valve stem (2), a valve core (3), and a valve seat (4), wherein a discharge port (11) is provided on the side of the valve body (1), the discharge port (11) is inclined downward and communicates with the interior of the valve body (1), and the valve seat (4) is fixedly arranged at the inlet of the upper end of the valve body (1) through an upper flange (5), characterized in that: The valve stem (2) is concentrically provided with a limiting portion (21) at its upper end, and a connecting screw sleeve (6) is sleeved on the valve stem (2) below the limiting portion (21). The bottom of the valve core (3) is provided with a mounting groove (31), and the mounting groove (31) comprises, from top to bottom, a first groove portion (311) adapted in shape to the limiting portion (21) and a second threaded hole portion (312) threadedly fixedly matched with the connecting screw sleeve (6), the lower end of the limiting portion (21) abuts against the upper end of the connecting screw sleeve (6) and is limited in the first groove portion (311). The inner hole diameter of the connecting screw sleeve (6) is larger than the diameter of the valve stem (2), and the first groove portion (311) is larger than the size of the limiting portion (21), so that there is an adjustment gap between the inner periphery of the first groove portion (311) and the outer periphery of the limiting portion (21), and between the inner periphery of the connecting screw sleeve (6) and the outer periphery of the valve stem (2).

2. A hard-sealed expansion valve according to claim 1, characterized in that: The limiting portion (21) comprises a limiting block (211) connected to the top of the valve stem (2) and a guiding hemisphere (212) connected to the top center of the limiting block (211); the plane at the top of the limiting block (211) and the hemispherical surface of the guiding hemisphere (212) form the upper end surface of the limiting portion (21).

3. A hard-sealed expansion valve according to claim 1, characterized in that: The connecting screw sleeve (6) comprises, from top to bottom, a threaded portion (61) threadedly matched with the second threaded hole portion (312) and an abutting portion (62) having an outer diameter larger than the threaded portion (61) and an upper end surface abutting against a lower end surface of the valve core (3).

4. A hard-sealed expansion valve according to claim 1, characterized in that: The bottom of the valve body (1) is connected to a bracket (7), a first limiting assembly is arranged between the bracket (7) and the valve stem (2), and the valve stem (2) is provided with a limiting hole (22) extending in its radial direction. The first limiting assembly comprises a limiting rod (81) radially penetrated on the bracket (7) and adapted to the shape of the limiting hole (22); the limiting rod (81) moves axially relative to the limiting hole (22) and has a first locking position in which the valve stem (2) is penetrated into the limiting hole (22) to limit the lifting and lowering movement of the valve stem (2) and a first working position away from the limiting hole (22).

5. A hard-sealed expansion valve according to claim 4, characterized in that: The bracket (7) is provided with a mounting channel (71) along its radial direction, which is adapted to the size of the limiting plug rod (81) and allows one end of the limiting plug rod (81) to pass through. The first limiting assembly further comprises a first abutment plate (82) connected to an end of the limiting rod (81) away from the limiting hole (22) and having a size larger than the diameter of the installation channel (71), a second abutment plate (83) fixed to the bracket (7) and arranged parallel to the first abutment plate (82), and a first elastic element (84) limited between the first abutment plate (82) and the second abutment plate (83). The first abutment plate (82) and the limiting insertion rod (81) are provided with a guide channel along their axial direction, and a first guide rod (85) which is adapted to the shape of the first abutment plate and forms a sliding fit is provided in the guide channel, one end of the first guide rod (85) is fixedly connected to the second abutment plate (83), and the first elastic element (84) is sleeved on the outer periphery of the first guide rod (85); The limiting rod (81) is provided with a limiting installation groove along its radial direction, a second limiting assembly is connected in the limiting installation groove, the second limiting assembly comprises a locking block (91), the locking block (91) moves to have a first retracted position completely located in the limiting installation groove and a first locking position with one end located outside the limiting installation groove, When the limiting rod (81) is located at the first locking position, the first abutment plate (82) abuts against the outer periphery of the bracket (7), and the positioning block (91) is located at the first contraction position; when the limiting rod (81) is located at the first working position, the positioning block (91) is located at the first positioning position and abuts against the outer periphery of the bracket (7).

6. A hard-sealed expansion valve according to claim 5, characterized in that: The second limiting assembly also includes a sliding plate (92) and a second elastic element (93), the sliding plate (92) is slidably connected to the inner cavity of the limiting installation groove, the locking block (91) is fixedly connected to the bottom end of the sliding plate (92), and the two ends of the second elastic element (93) are respectively abutted against the sliding plate (92) and the limiting installation groove.

7. A hard-sealed expansion valve according to claim 6, characterized in that: The limiting installation groove comprises, from bottom to top, a first connection groove (811) adapted to the size of the locking block (91) and a second connection groove (812) adapted to the size of the sliding plate (92) and slidably matched, the first connection groove (811) being smaller in size than the second connection groove (812) and forming a first limiting step (814) therebetween.

8. A hard-sealed expansion valve according to claim 7, characterized in that: The limiting installation groove also includes a third connection groove (813) connected to the upper side of the second connection groove (812) and having a size smaller than the second connection groove (812); a second limiting step (815) is formed between the second connection groove (812) and the third connection groove (813); a second guide rod (94) matching the size of the third connection groove (813) and slidingly matched is fixed to one end of the sliding plate (92) away from the locking block (91); the second elastic element (93) is sleeved outside the second guide rod (94) and its two ends respectively abut against the second limiting step (815) and the sliding plate (92).

9. A hard-sealed expansion valve according to any one of claims 4 to 8, characterized in that: The limiting hole (22) radially penetrates the valve stem (2), and two groups of the first limiting components are provided and symmetrically distributed on both sides of the valve stem (2).

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