Stop valve capable of being quickly opened and closed

Abstract

The utility model relates to the technical field of valves, in particular to a stop valve capable of being opened and closed quickly. Which comprises a valve body, a valve rod, a valve clack, a valve seat and a hand wheel, and is characterized by comprising a valve rod nut fixedly arranged on the valve body, and the valve rod is arranged in the valve rod nut in a matched mode; a radial guide pin is arranged at the tail end of the valve rod, and a spiral guide groove matched with the guide pin is formed in the valve clack. An included angle of 15-30 degrees is formed between the sealing surface of the valve clack and the sealing surface of the valve seat; the valve clack can be quickly opened, the valve can be quickly closed and opened, traditional thread transmission is replaced by the spiral guide mechanism, sliding friction is reduced, and operation torque is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a fast-opening and closing stop valve. Background Art

[0002] Traditional high-pressure globe valves have the following problems: Large operating torque: The valve stem and valve disc are driven by trapezoidal threads, which has large friction and is difficult to open and close, especially under high-pressure conditions;

[0003] Low sealing reliability: Flat seals are prone to leakage under high pressure, and the valve seat needs to be replaced as a whole after wear;

[0004] High maintenance cost: The valve seat and the valve body are designed as an integrated whole, and the entire valve needs to be disassembled when replacing. Therefore, it is urgent to provide an improved technical solution to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a stop valve that can be opened and closed quickly in order to solve the above-mentioned technical problems.

[0006] In view of this, the utility model provides a quick opening and closing stop valve, including a valve body, a valve stem, a valve disc, a valve seat, and a hand wheel, characterized in that it includes:

[0007] A valve stem nut, the valve stem nut is fixedly arranged on the valve body, and the valve stem is fitted in the valve stem nut;

[0008] A radial guide pin is provided at the end of the valve stem, and a spiral guide groove cooperating with the guide pin is provided inside the valve disc;

[0009] The valve disc sealing surface and the valve seat sealing surface form an angle of 15°-30°. Furthermore, the valve seat is a split structure, connected to the valve body through an annular groove.

[0010] Furthermore, the sealing end face of the valve disc is provided with a stepped composite sealing structure, which includes an outer soft sealing layer and an embedded hard sealing ring.

[0011] Furthermore, the helix angle of the spiral guide groove is 45°±2°.

[0012] Furthermore, a boss is provided at the bottom of the valve seat, forming an axial limiting structure with the positioning groove in the inner cavity of the valve body.

[0013] Furthermore, it also includes:

[0014] A packing chamber, which is arranged at the top of the valve body and around the valve stem;

[0015] A packing gland, which is mounted on the valve stem and sealed at the top of the packing cavity; A cylindrical pin, which is symmetrically arranged on both sides of the valve body and hinged to the valve body;

[0016] The packing pressure plate is sleeved on the valve stem, and the bottom thereof abuts against the top of the packing pressure sleeve, and is fixed by nuts and cylindrical pins.

[0017] The beneficial effects of the utility model are:

[0018] 1. The utility model realizes rapid opening of the valve disc, rapid closing and opening of the valve, and the spiral guide mechanism replaces the traditional thread transmission, reducing sliding friction and lowering the operating torque.

[0019] 2. The utility model can reduce the packing leakage rate and improve the sealing performance of the valve. Through the hinged design of the cylindrical pin, the packing gland can compensate for the packing wear by pressing the packing pressure plate, thereby extending the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic cross-sectional view of the utility model;

[0021] FIG2 is a schematic diagram of the three-dimensional structure of the top of the utility model;

[0022] FIG3 is a schematic diagram of the structure of area A in FIG1.

[0023] The symbols in the figure are:

[0024] 1. Valve body; 2. Valve stem nut; 3. Valve disc; 4. Handwheel; 5. Guide pin; 6. Valve seat; 7. Boss; 8. Soft sealing layer; 9. Hard sealing ring; 10. Packing cavity; 11. Packing sleeve; 12. Cylindrical pin; 13. Packing pressure plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of the present application.

[0026] Embodiment 1:

[0027] This embodiment provides a fast opening and closing stop valve, a fast opening and closing stop valve, including a valve body 1, a valve stem, a valve disc 3, a valve seat 6, and a hand wheel 4, characterized in that it includes:

[0028] A valve stem nut 2, the valve stem nut 2 is fixedly arranged on the valve body 1, and the valve stem is fitted in the valve stem nut 2;

[0029] An axial guide pin 5 is provided at the end of the valve stem, and a spiral guide groove cooperating with the guide pin 5 is provided inside the valve disc 3;

[0030] The sealing surface of the valve disc 3 and the sealing surface of the valve seat 6 form an angle of 15°-30°.

[0031] The valve stem nut 2 is fixed to the top of the valve body 1 by a fixed rib plate. The valve stem and the valve stem nut 2 are threadedly matched. A radial guide pin 5 is provided at the lower end of the valve stem, and a spiral guide groove that can cooperate with the guide pin 5 is provided at the top of the valve disc 3. In order to ensure that the valve disc 3 keeps moving up and down instead of rotating, an axial limit groove that cooperates with the limit block on the side of the valve disc 3 is usually provided on the valve body 1, or a limit block with a square cross-section or other shapes can achieve the same effect. The inclined sealing surface produces a self-tightening effect under the action of the medium pressure.

[0032] When the hand wheel 4 is rotated, the valve stem can be lifted upward through the cooperation of the valve stem and the valve stem nut 2. When the valve stem rotates, the guide pin 5 also rotates relatively with the valve disc 3. With the cooperation of the guide pin 5 and the spiral groove of the valve disc 3, the valve disc 3 moves upward, thereby quickly opening the valve disc 3 and realizing rapid closing and opening of the valve. In addition, the spiral guide mechanism replaces the traditional threaded transmission, reduces sliding friction, and reduces operating torque.

[0033] Embodiment 2:

[0034] This embodiment provides a fast opening and closing stop valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0035] The valve seat 6 is a split structure and is connected to the valve body 1 through an annular groove.

[0036] The replacement efficiency of the valve seat 6 is higher, the replacement time is shortened, and the split structure allows the wear parts to be replaced separately, reducing the maintenance cost.

[0037] Embodiment 3:

[0038] This embodiment provides a fast opening and closing stop valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0039] The sealing end face of the valve disc 3 is provided with a stepped composite sealing structure, which includes an outer soft sealing layer 8 and an embedded hard sealing ring 9.

[0040] The sealing end face of the valve disc 3 is processed with a stepped groove, the outer layer is filled with a PTFE soft sealing layer 8, and the inner layer is embedded with a 316L stainless steel hard sealing ring 9. The hard sealing ring 9 is 80.5mm higher than the soft sealing layer to form a two-level seal.

[0041] Under normal working conditions, the PTFE layer is sealed first. When the soft seal fails or encounters high temperature, the hard seal ring 9 contacts the valve seat 6 to form a metal-metal seal. The soft seal layer 8 achieves zero leakage at low pressure, and the hard seal ring 9 provides backup sealing at high temperature or high pressure, making the valve work more widely and having a wider range of use.

[0042] Embodiment 4:

[0043] This embodiment provides a fast opening and closing stop valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0044] The helix angle of the spiral guide groove is designed to be 45°, with a tolerance of ±2°; the groove depth is 3mm, which matches the guide pin 5 with a diameter of Φ10mm.

[0045] After the helix angle is optimized, the ratio of the axial movement speed to the rotation speed of the valve disc 3 reaches 1:1.4, balancing the operating efficiency and sealing accuracy; the transmission clearance is controlled to be ≤0.05mm to avoid jamming.

[0046] A boss 7 is provided at the bottom of the valve seat 6 to form an axial limiting structure with the positioning groove in the inner cavity of the valve body 1 .

[0047] The bottom of the valve seat 6 is machined with a Φ15mm positioning boss 7;

[0048] A positioning groove with a depth of 10 mm is milled at the corresponding position of the inner cavity of the valve body 1.

[0049] The positioning groove can improve the positioning accuracy of the valve seat 6 during repeated installation and the axial limit

[0050] It can prevent the valve seat 6 from shifting under high pressure impact. It also includes:

[0051] A packing chamber 10, wherein the packing chamber 10 is arranged at the top of the valve body 1 and is arranged around the valve stem;

[0052] A packing gland 11, which is sleeved on the valve stem and sealed at the top of the packing chamber 10;

[0053] The cylindrical pins 12 are symmetrically arranged on both sides of the valve body 1 and are hinged to the valve body 1;

[0054] The packing pressing plate 13 is sleeved on the valve stem, and its bottom abuts against the top of the packing pressing sleeve 11, and is fixed with the cylindrical pin 12 by a nut.

[0055] Flexible graphite packing is filled in the packing cavity 10, and the symmetrical cylindrical pin 12 structure ensures that the pressure plate is evenly stressed, reduces the packing leakage rate, and improves the sealing of the valve. The hinged design of the cylindrical pin 12 allows the packing sleeve 11 to compensate for the packing wear by pressing the packing pressure plate 13, thereby extending the maintenance cycle.

[0056] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which belong to the scope of protection of the present application.

Claims

1. A quick-opening and closing stop valve, comprising a valve body, a valve stem, a valve disc, a valve seat, and a hand wheel, characterized in that: include: A valve stem nut, the valve stem nut is fixedly arranged on the valve body, and the valve stem is fitted in the valve stem nut; A radial guide pin is provided at the end of the valve stem, and a spiral guide groove cooperating with the guide pin is provided inside the valve disc; The valve disc sealing surface and the valve seat sealing surface form an angle of 15°-30°.

2. A quick opening and closing stop valve according to claim 1, characterized in that: The valve seat is a split structure and is connected to the valve body through an annular groove.

3. A quick opening and closing stop valve according to claim 1, characterized in that: The sealing end face of the valve disc is provided with a stepped composite sealing structure, which comprises an outer soft sealing layer and an inner hard sealing ring.

4. A quick opening and closing stop valve according to claim 1, characterized in that: The helix angle of the spiral guide groove is 45°±2°.

5. A quick opening and closing stop valve according to claim 2, characterized in that: A boss is provided at the bottom of the valve seat, which forms an axial limiting structure with the positioning groove in the inner cavity of the valve body.

6. A quick opening and closing stop valve according to claim 1, characterized in that: Also includes: A packing chamber, which is arranged at the top of the valve body and around the valve stem; A packing gland, which is mounted on the valve stem and sealed at the top of the packing cavity; A cylindrical pin, which is symmetrically arranged on both sides of the valve body and hinged to the valve body; The packing pressure plate is sleeved on the valve stem, and the bottom thereof abuts against the top of the packing pressure sleeve, and is fixed by nuts and cylindrical pins.

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