阅读说明：本技术 一种长使用寿命旋启式止回阀 (Long service life swing check valve ) 是由 李来滨 邵建国 杜爱芝 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种长使用寿命旋启式止回阀,包括阀体,所述阀体内设有阀腔,所述阀体的侧面设有与阀腔连通的进口管和出口管；所述阀腔的上端开口处固定安装有阀盖,所述阀腔内在进口管处设有环形阀座,所述阀腔的内侧壁在环形阀座上方铰接有阀杆,所述阀杆上设有阀瓣,所述阀瓣上设有用于压在环形阀座上的密封垫,所述阀杆上沿其长度方向滑动连接有套接在阀瓣上的护套板,所述阀腔的内侧壁上设有向下倾斜的动力槽,所述护套板上设有伸入动力槽内的凸柱；在阀瓣将环形阀座完全打开时,护套板将密封垫完全罩住；该止回阀不仅结构简单,而且能够在打开时对阀瓣进行清洁同时保护阀瓣。(The invention discloses a long-service-life swing check valve which comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe which are communicated with the valve cavity are arranged on the side surface of the valve body; a valve cover is fixedly installed at an opening at the upper end of the valve cavity, an annular valve seat is arranged at an inlet pipe in the valve cavity, a valve rod is hinged to the inner side wall of the valve cavity above the annular valve seat, a valve clack is arranged on the valve rod, a sealing gasket used for pressing the annular valve seat is arranged on the valve clack, a sheathing plate sleeved on the valve clack is connected to the valve rod in a sliding mode along the length direction of the valve rod, a power groove which inclines downwards is formed in the inner side wall of the valve cavity, and a protruding column which extends into; when the valve clack completely opens the annular valve seat, the protective sleeve plate completely covers the sealing gasket; the check valve is simple in structure, and can clean the valve clack and protect the valve clack when the check valve is opened.)

1. A long-service-life swing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe which are communicated with the valve cavity are arranged on the side surface of the valve body; the valve comprises a valve cavity and a valve cover, and is characterized in that an annular valve seat is fixedly installed at an opening at the upper end of the valve cavity, an inlet pipe is arranged in the valve cavity, a valve rod is hinged above the annular valve seat on the inner side wall of the valve cavity, a valve clack is arranged on the valve rod, a sealing gasket used for pressing on the annular valve seat is arranged on the valve clack, a sheathing plate sleeved on the valve clack is connected to the valve rod in a sliding mode along the length direction of the valve rod, a power groove inclining downwards is arranged on the inner side wall of the valve cavity, a protruding column extending into the power groove is arranged on the sheathing plate, when the valve clack leaves the annular valve seat, the sheathing plate moves towards the direction close to; when the valve clack opens the ring valve seat completely, the protecting sleeve plate covers the sealing gasket completely.

2. The long-service-life swing check valve according to claim 1, wherein the valve stem is provided with a protrusion along the length direction thereof, the protrusion is internally provided with a sliding hole along the length direction of the valve stem, the sheathing plate is fixedly provided with a plug rod extending into the sliding hole, and one end of the plug rod away from the sheathing plate is provided with a plug body connected in the sliding hole in a sliding manner; the plug is characterized in that a valve core assembly is arranged in the plug body and used for controlling the plug rod to extend out quickly and retract slowly.

3. The long service life swing check valve of claim 2, wherein the spool assembly includes a sliding block, a rodless cavity is formed in the sliding hole between a plug body and the bottom of the sliding hole, a slotted hole communicated with the rodless cavity is formed in the plug body, a snap spring is arranged on the inner side wall of the slotted hole, the sliding block is slidably connected in the slotted hole and located at the bottom of the snap spring and the slotted hole, a damping hole is formed in the middle of the sliding block along the axial direction of the plug rod, a through hole is formed in the eccentric position of the sliding block along the axial direction of the plug rod, first through holes for communicating the valve cavity with the slotted hole are formed in the plug rod and the plug body, the sliding block abuts against the snap spring when the valve clack leaves the annular valve seat, the through hole is opened at the moment, the valve clack abuts against the bottom of the slotted hole when the valve.

4. The long life swing check valve of claim 1 wherein the upper end of the valve cap is threaded with a bail latch.

5. The long-life swing check valve of claim 1, wherein the inlet and outlet tubes are coaxially disposed, the inner sidewall of the valve chamber has a rib above the outlet tube, and the valve stem abuts against the rib when the valve flap is fully opened.

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a swing check valve with long service life.

Background

The check valve is a valve which is used for preventing the media from flowing backwards by automatically opening and closing a valve clack depending on the flowing of the media. Depending on the structure, the check valves commonly used at present include a lift check valve, a swing check valve, and a butterfly check valve. The swing check valve comprises a valve body, a valve seat, a valve clack, a rocker and a fixed shaft, wherein the valve seat is arranged at the upstream fluid passage, and one end of the rocker is hinged on the fixed shaft while the other end is fixedly connected with the valve clack; under the condition that fluid in the valve body is static or flows backwards, the valve clack falls down under the impact of self gravity and the fluid, the valve clack covers the valve seat, and then the upstream fluid channel and the downstream fluid channel are cut off, and the fluid flows backwards. When fluid flows from the upstream fluid channel to the downstream fluid channel in the valve body, the valve clack is naturally opened under the impact of circulation, and the fluid flows smoothly. The prior art swing check valves have several problems in use:

1. in the process of rotating and closing the check valve clack around the pin shaft, the closing speed is easy to generate too high, so that the impact force of the valve clack sealing surface to the valve seat sealing surface is too large and the valve clack is easy to damage; meanwhile, when the check valve clack is closed quickly, water hammer is easy to generate, and the damage conditions such as damage to the valve are caused;

2. when the fluid of the swing check valve normally flows in the correct direction, the valve flap hovers above the fluid in a nearly horizontal attitude, and the reason why the valve flap can maintain the nearly horizontal attitude is the continuous impact force of the fluid against the front face of the valve flap. This frontal fluid impact has a severe abrasive effect on the elastomeric seals mounted on the valve flap surfaces, and especially in the case of fluids containing small solid particles, swing check valves often fail due to the abrasive wear of the elastomeric seals.

Disclosure of Invention

The invention aims to provide a long-service-life swing check valve which is simple in structure and can clean and protect a valve clack when the valve clack is opened.

In order to achieve the purpose, the invention provides the following technical scheme:

a long-service-life swing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe which are communicated with the valve cavity are arranged on the side surface of the valve body; the valve comprises a valve cavity, an inlet pipe, a valve rod, a valve clack, a sealing gasket, a protective sleeve plate, a convex column and a valve cover, wherein the valve cavity is fixedly provided with the valve cover at an upper opening, the inlet pipe is arranged in the valve cavity, the inner side wall of the valve cavity is hinged with the valve rod above the annular valve seat, the valve rod is provided with the valve clack, the valve clack is provided with the sealing gasket for pressing the annular valve seat, the valve rod is connected with the protective sleeve plate sleeved on the valve clack in a sliding mode along the length direction of the valve rod, the inner side wall of the valve cavity is provided with the power groove inclining downwards, the protective sleeve plate is provided with the convex column; when the valve clack opens the ring valve seat completely, the protecting sleeve plate covers the sealing gasket completely.

Furthermore, a protrusion is reversely arranged on the valve rod along the length direction of the valve rod, a sliding hole is formed in the protrusion along the length direction of the valve rod, a plug rod extending into the sliding hole is fixedly installed on the sheathing plate, and a plug body connected in the sliding hole in a sliding manner is arranged at one end, far away from the sheathing plate, of the plug rod; the plug is characterized in that a valve core assembly is arranged in the plug body and used for controlling the plug rod to extend out quickly and retract slowly.

Further, the case subassembly includes the sliding block, form the rodless chamber in the slide opening between the bottom of cock body and slide opening, the internal slotted hole that communicates with rodless chamber that is equipped with of cock, the inside wall of slotted hole is equipped with the jump ring, sliding block sliding connection just is located in the slotted hole the bottom of jump ring and slotted hole, the middle part of sliding block is equipped with the damping orifice along the axial of cock stem, the eccentric department of sliding block is equipped with the through-flow hole along the cock stem axial, be equipped with the first through-hole that is used for intercommunication valve pocket and slotted hole in cock body, when the valve clack left the ring disk seat, the sliding block contradicts on the jump ring, and the through-flow hole was opened this moment, and when the valve clack pressed to the ring disk seat, the sliding block contradicted in the.

Furthermore, the upper end of the valve cover is in threaded connection with a hanging ring buckle.

Furthermore, the inlet pipe and the outlet pipe are coaxially arranged, a flange is arranged above the outlet pipe on the inner side wall of the valve cavity, and when the valve clack is completely opened, the valve rod is abutted against the flange.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the valve core assembly is arranged, so that the plug rod slowly retracts, the valve clack plays a role in buffering when closed, and water hammer and damage to the annular valve seat are prevented;

(2) the valve clack sealing gasket is provided with the protective sleeve plate, when the valve clack is opened, the protective sleeve plate can not only scrape a medium adhered to the valve clack sealing gasket, but also cover the upper part of the valve clack sealing gasket, so that the medium is prevented from being adhered to the sealing gasket when the valve clack is opened, the impact of a fluid medium on the sealing gasket on the valve clack is also prevented, the valve clack sealing gasket can be effectively protected, the sealing performance is obviously improved, and the service life is.

Drawings

FIG. 1 is a cross-sectional view of the present invention with the valve flap in a closed position;

FIG. 2 is a cross-sectional view of the present invention with the valve flap in an open position;

FIG. 3 is an enlarged view taken at A in FIG. 1;

FIGS. 4-5 are schematic views of three-dimensional structures of the valve flap and the valve stem of the present invention;

FIG. 6 is a schematic three-dimensional structure of the sheathing board according to the present invention;

fig. 7 is a schematic diagram of an assembled three-dimensional structure of the valve rod, the valve clack and the sheathing plate in the invention.

Detailed Description

Referring to fig. 1-7, a long-service life swing check valve includes a valve body 1, a valve cavity 101 is provided in the valve body 1, an inlet pipe 11 and an outlet pipe 12 communicated with the valve cavity 101 are provided on the side surface of the valve body 1, and the inlet pipe 11 and the outlet pipe 12 are coaxially provided; a valve cover 4 is fixedly installed at an opening at the upper end of the valve cavity 101, and a lifting ring buckle 41 is connected to the upper end of the valve cover 4 through threads; the valve comprises a valve cavity 101 and a valve body, wherein an inlet pipe 11 is arranged in the valve cavity 101, an annular valve seat 2 is hinged to the inner side wall of the valve cavity 101 above the annular valve seat 2, a valve clack 3 is arranged on the valve rod 3a, a sealing gasket 3b used for pressing the annular valve seat 2 is arranged on the valve clack 3, a protecting plate 6 sleeved on the valve clack 3 is connected to the valve rod 3a in a sliding mode along the length direction of the valve rod 3a, a power groove 1a inclined downwards is formed in the inner side wall of the valve cavity 101, a convex column 61 extending into the power groove 1a is arranged on the protecting plate 6, when the valve clack 3 leaves the annular valve seat 2, the protecting plate 6 moves towards the direction close to the valve clack 3 along the power groove 1a, and when the valve clack; when the valve flap 3 has fully opened the annular valve seat 2, the sealing gasket 3b is completely covered by the sheathing plate 6. The inner side wall of the valve chamber 101 is provided with a rib 102 above the outlet tube 12, and the valve stem 3a abuts against the rib 102 when the valve flap 3 is fully opened.

The valve rod 3a is reversely provided with a bulge 3c along the length direction thereof, a sliding hole 31 is formed in the bulge 3c along the length direction of the valve rod 3a, a plug rod 7 extending into the sliding hole 31 is fixedly installed on the sheathing plate 6, and one end of the plug rod 7 far away from the sheathing plate 6 is provided with a plug body 71 which is connected in the sliding hole 31 in a sliding manner; the plug body 71 is internally provided with a valve core assembly which is used for controlling the plug rod 7 to extend out quickly and retract slowly. The valve core assembly comprises a sliding block 8, a rodless cavity 7a is formed in the sliding hole 31 between a plug body 71 and the bottom of the sliding hole 31, a slotted hole 8a communicated with the rodless cavity 7a is arranged in the plug body 71, a snap spring 83 is arranged on the inner side wall of the slotted hole 8a, the sliding block 8 is slidably connected in the slot hole 8a and is positioned at the bottom of the clamp spring 83 and the slot hole 8a, the middle part of the sliding block 8 is provided with a damping hole 81 along the axial direction of the plug rod 7, the eccentric part of the sliding block 8 is provided with a through hole 82 along the axial direction of the plug rod 7, the plug rod 7 and the plug body 71 are internally provided with a first through hole 84 for communicating the valve cavity 101 with the slotted hole 8a, when the valve flap 3 leaves the annular valve seat 2, the sliding block 8 abuts against the snap spring 83, and the through-flow hole 82 is opened, when the flap 3 is pressed against the ring valve seat 2, the sliding block 8 abuts against the bottom of the groove hole 8a, and the through-flow hole 82 is closed.

When the valve clack 3 is opened from the closing position shown in fig. 1, the valve clack 3 moves towards the upper right, and the convex column 61 is matched with the power groove 1a, so that the protective sleeve plate 6 slides downwards along the sealing gasket 3b of the valve clack 3, on one hand, impurities on the sealing gasket 3b are scraped off, on the other hand, as shown in fig. 2, after the valve clack 3 is opened, the protective sleeve plate 6 covers the sealing gasket 3b, a medium is prevented from being washed onto the sealing gasket 3b, and the sealing gasket 3b is protected. When the sheathing board 6 slides downward, the plug body 71 is driven to extend outward, so that the volume of the rodless cavity 7a is increased, and the medium pushes the sliding block 8 against the snap spring 83 and enters the rodless cavity 7a through the damping hole 81 and the through-flow hole 82.

When the inlet pressure is reduced, under the action of the gravity of the valve clack 3 and the action of the pressure difference between the inlet and the outlet, the valve clack 3 moves towards the left lower side, through the matching of the convex column 61 and the power groove 1a, the protective sleeve plate 6 slides upwards along the sealing gasket 3b of the valve clack 3 and drives the plug body 71 to retract, so that the volume of the rodless cavity 7a is reduced, the medium in the rodless cavity 7a pushes the sliding block 8 to the bottom of the slotted hole 8a, the medium in the rodless cavity 7a can only flow out through the damping hole 81, the closing of the valve clack 3 has a damping buffering effect, and when the valve clack 3 is closed, the protective sleeve plate 6 slides upwards again.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.