Forward-closing unloading pressure self-sealing stop valve

Abstract

The invention provides a clockwise-closing unloading pressure self-sealing stop valve, and relates to the field of petroleum pipeline valves, the clockwise-closing unloading pressure self-sealing stop valve comprises a valve body, the right side of the valve body is provided with a flow inlet, the left side of the valve body is provided with a flow outlet, and the upper end of the valve body is provided with a valve cover; a supporting plate is fixedly installed on the portion, located outside the sealing shaft sleeve, of the upper end face of the valve deck. Through the arrangement of a pushing spring, a sliding cylinder, a strip-shaped sliding block and a strip-shaped sliding groove, the stop valve adopts a clockwise closing mode, when the pressure of petroleum in a flow inlet is higher, the downward pressure borne by a round valve clack and a sealing block is larger, the downward pressure borne by the round valve clack and the sealing block is larger, and the sealing effect is better; the stop effect of the stop valve is effectively improved; the problems that an existing stop valve for the petroleum pipeline generally adopts a reverse closing mode, so that when the pressure is high, the sealing performance is poor, and the stop effect of the stop valve is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum pipeline valves, in particular to a pressure self-sealing stop valve for unloading by closing. Background Art

[0002] With the rapid development of the oil industry, oil pipelines, as the main mode of oil transportation, are increasingly valued for their safety and reliability. In the process of oil pipeline transportation, stop valves, as an important control device, can effectively control the flow of oil and ensure the safe operation of oil pipelines.

[0003] However, the stop valves used in existing oil pipelines generally adopt a reverse closing method. Such a design cannot achieve pressure self-sealing, so that when the pressure is high, the sealing performance will be poor, affecting the stop effect of the stop valve, resulting in the stop valve being unable to be completely closed or not closed tightly, thereby causing fluid leakage. The leakage of the fluid will not only cause energy waste, but also may pollute the environment. Especially when handling harmful or flammable media, leakage may cause safety accidents, thereby reducing the reliability of the stop valve during use. In addition, the stop valve of the reverse closing method will be affected by the fluid pressure during the closing process, making the stop valve of the reverse closing method more laborious during the closing operation. Summary of the invention

[0004] The disclosed embodiment relates to a pressure self-sealing stop valve with smooth closing and unloading, which can automatically achieve sealing of circular grooves and tapered through holes through the arrangement of a push spring, a sliding cylinder, a strip sliding block and a strip sliding groove, and the stop valve adopts a smooth closing method. When the oil pressure inside the inlet port is higher, the downward pressure on the circular valve flap and the sealing block will be greater, and the greater the downward pressure on the circular valve flap and the sealing block, the better the sealing effect will be, thereby effectively improving the stop effect of the stop valve and avoiding the phenomenon that the stop valve cannot be completely closed or is not closed tightly; through the downward elastic force of the push spring and the oil pressure inside the inlet port, the circular valve flap and the sealing block are more labor-saving when performing the downward closing operation, and can achieve a self-sealing effect.

[0005] In the first aspect of the present disclosure, a pressure self-sealing stop valve with a normally closed unloading function is provided, specifically including: a valve body, an inlet port is arranged on the right side of the valve body, and an outlet port is arranged on the left side of the valve body, and a valve cover is installed on the upper end of the valve body; a sealing shaft sleeve is arranged in the middle of the upper end surface of the valve cover, and a support plate is fixedly installed outside the sealing shaft sleeve on the upper end surface of the valve cover. A valve stem is rotatably connected inside the sealing shaft sleeve, and spiral stripes are arranged on the lower side of the outer peripheral surface of the valve stem. The lower end of the valve stem is connected to a sliding cylinder through the spiral stripes, and a circular valve flap is fixedly connected to the lower end of the sliding cylinder. A top push spring is sleeved outside the valve stem between the sliding cylinder and the valve cover; a driving mechanism is installed on the upper end surface of the support plate. Two T-shaped sliding grooves are opened on the right side of the upper end surface of the support plate, and a C-shaped sliding frame is slidably connected to the two T-shaped sliding grooves. An automatic top push mechanism is fixedly installed on the upper end surface of the C-shaped sliding frame, and a one-way limiting mechanism is arranged at the left end of the automatic top push mechanism; a plugging part is installed on the inner bottom end surface of the C-shaped sliding frame.

[0006] In at least some embodiments, a plugging hole is opened on the right side of the upper end surface of the support plate; two T-shaped sliders are arranged on the bottom end surface of the C-shaped sliding frame, and the two T-shaped sliders are respectively slidably connected to the two T-shaped sliding grooves.

[0007] In at least some embodiments, a stop block is arranged inside the valve body, a circular groove is opened in the middle of the upper end surface of the stop block, and a tapered through hole is opened on the bottom end surface inside the circular groove. The diameter dimension of the inner peripheral surface of the circular groove is equal to the diameter dimension of the outer peripheral surface of the circular valve flap. A circular through hole communicating with the tapered through hole is opened in the middle of the bottom end surface of the stop block; four strip-shaped sliding grooves are arranged in an annular array on the inner peripheral surface of the upper part of the valve body.

[0008] In at least some embodiments, a rotating handwheel is arranged at the upper end of the valve stem, a one-way wheel is fixedly installed at the upper end of the valve stem, and fan-shaped tooth blocks are arranged in an annular array on the outer peripheral surface of the one-way wheel.

[0009] In at least some embodiments, four strip-shaped sliders are arranged in an annular array on the outer peripheral surface of the sliding cylinder, and the four strip-shaped sliders are respectively slidably connected to the four strip-shaped sliding grooves; a spiral groove is opened on the inner peripheral surface of the sliding cylinder, and the spiral groove is connected to the spiral stripes; the elastic force of the top push spring is greater than the friction force between the spiral groove and the spiral stripes.

[0010] In at least some embodiments, a sealing block is arranged at the bottom of the circular valve flap, and the outer peripheral surface of the lower part of the sealing block is a tapered surface.

[0011] In at least some embodiments, the driving mechanism includes a driving motor, a passive gear and a driving gear. The driving motor is fixedly mounted on the left rear portion of the upper end surface of the support plate, and a driving gear is fixedly mounted on the rotating shaft of the driving motor. The passive gear is fixedly mounted on the outer upper end of the valve stem, and the passive gear is meshed with the driving gear, and the diameter of the passive gear is three to four times the diameter of the driving gear.

[0012] In at least some embodiments, the automatic pushing mechanism includes an electric cylinder, a pushing plate, a transverse guide rod and a sliding sleeve. The electric cylinder is fixedly installed on the top of the U-shaped sliding frame, and the left end of the telescopic rod of the electric cylinder is fixedly connected to the pushing plate, and the front and rear sides of the right end of the pushing plate are fixedly connected to a transverse guide rod, and each transverse guide rod is slidably connected to a sliding sleeve on the outside, and the sliding sleeve is fixedly connected to the outside of the electric cylinder.

[0013] In at least some embodiments, the one-way limiting mechanism includes a rectangular slide, a rectangular slide column, a tightening block, a triangular one-way limiting block and a limiting block. The rectangular slide is fixedly installed in the middle of the left end surface of the push plate, and a rectangular slide column is slidably connected inside the rectangular slide, and a tightening block is fixedly connected to the left end of the rectangular slide column, and a triangular one-way limiting block is arranged on the left end surface of the tightening block; four rectangular openings are opened on the outside of the rectangular slide, four limit blocks are fixedly connected to the rectangular slide column, and the four limit blocks are respectively located in the four rectangular openings opened on the rectangular slide; when the one-way limiting mechanism is in the one-way limiting state, the triangular one-way limiting block is in close contact with the right side of the outer peripheral surface of the one-way wheel.

[0014] In at least some embodiments, the plug-in part includes a rectangular shell, a rectangular slider, a plug-in rod and a handle. The rectangular shell is fixedly mounted on the inner bottom end surface of the U-shaped sliding frame, and a rectangular slider is slidably connected inside the rectangular shell. The bottom end surface of the rectangular slider is fixedly connected to a plug-in rod that passes through the lower part of the rectangular shell. A spring is provided on the upper side of the rectangular slider inside the rectangular shell, and a handle is fixedly connected to the right end surface of the rectangular slider. When the plug-in part is in a limited position, the plug-in rod is plugged into the plug-in hole.

[0015] The present invention provides a pressure self-sealing stop valve with a closing and unloading function, which has the following beneficial effects:

[0016] 1. By setting the pushing spring, sliding cylinder, strip-shaped slider and strip-shaped chute, when it is necessary to cut off the oil, control the telescopic rod of the electric cylinder to retract to the right, driving the whole one-way limiting mechanism to move to the right, separating the triangular one-way limiting block from the right side of the outer peripheral surface of the one-way wheel. At this time, the sliding cylinder starts to move linearly downward under the elastic force of the pushing spring, driving the circular valve flap and the sealing block to move downward, automatically sealing the circular groove and the conical through hole. Since this stop valve adopts the closing-in-the-forward direction method, when the oil pressure inside the inlet is higher, the downward pressure on the circular valve flap and the sealing block will be greater, and the greater the downward pressure on the circular valve flap and the sealing block, the better its sealing effect. Therefore, the cut-off effect of this stop valve is effectively improved, avoiding the phenomenon that this stop valve cannot be completely closed or is not tightly closed. Therefore, it can effectively avoid fluid leakage, avoid wasting energy, polluting the environment and causing safety accidents, thus improving the reliability of this stop valve during use.

[0017] 2. Due to the downward elastic force of the pushing spring and the oil pressure inside the inlet, when this stop valve is closed, a unloading effect can be achieved, making it more labor-saving for the circular valve flap and the sealing block to move downward during the closing operation, and it can achieve a self-sealing effect. Moreover, the structure is simple, the cost is low, and the practicability is strong.

[0018] 3. By setting the one-way limiting mechanism, the one-way limiting function in the counterclockwise direction can be carried out on the one-way wheel and the valve stem through the one-way limiting mechanism, so as to effectively avoid the situation that the opened circular valve flap and the sealing block automatically close, improving the reliability of this stop valve during use.

[0019] 4. Through the cooperation of the C-shaped sliding frame, the inserting part and the inserting hole, when it is necessary to manually close this stop valve, only need to manually pull the handle upward, which can drive the rectangular slider and the inserting rod to move upward, pull the inserting rod out of the inserting hole. At this time, the C-shaped sliding frame loses the limiting effect on the upper part of the support plate, and then slide the C-shaped sliding frame to the right, which can drive the whole one-way limiting mechanism to move to the right, separating the triangular one-way limiting block from the right side of the outer peripheral surface of the one-way wheel. At this time, the sliding cylinder will also start to move linearly downward under the elastic force of the pushing spring, driving the circular valve flap and the sealing block to move downward, automatically sealing the circular groove and the conical through hole. Therefore, this stop valve can realize the opening and closing operations of electric and manual methods, improving the flexibility of this stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0021] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram showing the structure of the first perspective of the present application is shown;

[0024] Figure 2 A schematic diagram showing the structure of the second viewing angle of the present application is shown;

[0025] Figure 3 A schematic diagram of a partial cross-section of the valve body, inlet, outlet, valve cover, sealing sleeve, support plate and cut-off block of the present application is shown;

[0026] Figure 4 A schematic diagram of a partial cross-section of the valve body, inlet, outlet and cut-off block of the present application is shown;

[0027] Figure 5 A schematic diagram showing the structure of the valve flap and the sealing block of the present application in an open state;

[0028] Figure 6 A schematic diagram showing the structure of the valve flap and the sealing block of the present application in a closed state;

[0029] Figure 7 The schematic diagram of the structure after the valve stem and the sliding cylinder of the present application are disassembled is shown;

[0030] Figure 8 A schematic structural diagram of the valve stem, one-way wheel and one-way limiting mechanism of the present application is shown;

[0031] Fig. 9 A schematic diagram showing the structure of the one-way wheel and the one-way limiting mechanism of the present application is shown;

[0032] Fig.10 The schematic diagram of the structure of the plug-in part of the present application is shown;

[0033] Fig.11 A schematic structural diagram of the support plate, T-shaped slide groove and plug-in hole of the present application is shown.

[0034] Reference numerals list

[0035] 1. Valve body; 101. Inlet; 102. Outlet; 103. Valve cover; 104. Sealing sleeve; 105. Support plate; 106. T-shaped slide; 107. Plug hole; 108. Strip slide; 109. Stop block; 1010. Circular groove; 1011. Conical through hole; 1012. U-shaped sliding frame;

[0036] 2. Valve stem; 201. Rotating hand wheel; 202. One-way wheel; 203. Sliding cylinder; 204. Strip slider; 205. Round valve disc; 206. Sealing block; 207. Push spring; 208. Spiral stripes; 209. Spiral grooves;

[0037] 3. Driving mechanism; 301. Driving motor; 302. Driven gear; 303. Driving gear;

[0038] 4. Automatic pushing mechanism; 401. Electric cylinder; 402. Pushing plate; 403. Lateral guide rod; 404. Sliding sleeve;

[0039] 5. One-way limiting mechanism; 501. Rectangular sliding cylinder; 502. Rectangular sliding column; 503. Tightening block; 504. Triangular one-way limiting block; 505. Limiting block;

[0040] 6. Insertion part; 601. Rectangular shell; 602. Rectangular slider; 603. Insertion rod; 604. Handle. Detailed implementation mode

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0042] Embodiment 1: Please refer to Figures 1 to 11 :

[0043] The present invention provides a pressure self-sealing stop valve with closing and unloading, including: a valve body 1, an inlet port 101 is provided on the right side of the valve body 1, and an outlet port 102 is provided on the left side of the valve body 1. A valve cover 103 is installed on the upper end of the valve body 1; a sealing shaft sleeve 104 is provided in the middle of the upper end surface of the valve cover 103, and a support plate 105 is fixedly installed outside the sealing shaft sleeve 104 on the upper end surface of the valve cover 103. A valve rod 2 is rotatably connected inside the sealing shaft sleeve 104, and a spiral stripe 208 is provided on the lower side of the outer peripheral surface of the valve rod 2. A sliding cylinder 203 is connected to the lower end of the valve rod 2 through the spiral stripe 208, and a circular valve flap 205 is fixedly connected to the lower end of the sliding cylinder 203. A top push spring 207 is sleeved outside the valve rod 2 between the sliding cylinder 203 and the valve cover 103; a driving mechanism 3 is installed on the upper end surface of the support plate 105. Two T-shaped chutes 106 are opened on the right side of the upper end surface of the support plate 105, and a C-shaped sliding frame 1012 is slidably connected to the two T-shaped chutes 106. An automatic pushing mechanism 4 is fixedly installed on the upper end surface of the C-shaped sliding frame 1012, and a one-way limiting mechanism 5 is provided at the left end of the automatic pushing mechanism 4; an insertion part 6 is installed on the inner bottom end surface of the C-shaped sliding frame 1012. Through the setting of the insertion part 6, it is used to limit the C-shaped sliding frame 1012.

[0044] On the upper right side of the upper end surface of the support plate 105, a socket hole 107 is provided; on the bottom end surface of the U-shaped sliding frame 1012, two T-shaped sliders are provided, and the two T-shaped sliders are respectively slidably connected to the two T-shaped sliding grooves 106, so that the U-shaped sliding frame 1012 can only perform linear sliding in the left-right direction on the support plate 105.

[0045] Inside the valve body 1, a cut-off block 109 is provided, and in the middle of the upper end surface of the cut-off block 109, a circular groove 1010 is provided, and in the bottom end surface of the circular groove 1010, a tapered through hole 1011 is provided. The diameter dimension of the inner peripheral surface of the circular groove 1010 is equal to the diameter dimension of the outer peripheral surface of the circular valve flap 205. In the middle of the bottom end surface of the cut-off block 109, a circular through hole communicating with the tapered through hole 1011 is provided; on the inner peripheral surface of the upper part of the valve body 1, four strip-shaped sliding grooves 108 are provided in an annular array for slidably connecting with the strip-shaped sliders 204.

[0046] At the upper end of the valve stem 2, a rotating handwheel 201 is provided, and at the upper end of the outer part of the valve stem 2, a one-way wheel 202 is fixedly installed, and on the outer peripheral surface of the one-way wheel 202, fan-shaped tooth blocks are provided in an annular array to realize the one-way limiting effect on the valve stem 2, specifically the limiting effect in the counterclockwise rotation direction.

[0047] On the outer peripheral surface of the sliding cylinder 203, four strip-shaped sliders 204 are provided in an annular array, and the four strip-shaped sliders 204 are respectively slidably connected to the four strip-shaped sliding grooves 108; on the inner peripheral surface of the sliding cylinder 203, a spiral groove 209 is provided, and the spiral groove 209 is connected to the spiral stripe 208; the elastic force of the pushing spring 207 is greater than the frictional force between the spiral groove 209 and the spiral stripe 208. Therefore, after the triangular one-way limiting block 504 is separated from the right side of the outer peripheral surface of the one-way wheel 202, the sliding cylinder 203 can move linearly downward under the elastic force of the pushing spring 207, driving the circular valve flap 205 and the sealing block 206 to move downward, automatically realizing the sealing of the circular groove 1010 and the tapered through hole 1011.

[0048] At the bottom of the circular valve flap 205, a sealing block 206 is provided, and the lower outer peripheral surface of the sealing block 206 is a tapered surface, which can be in closer contact with the tapered through hole 1011, improving the sealing performance of the sealing block 206 in the closed state.

[0049] The driving mechanism 3 includes a driving motor 301, a passive gear 302 and a driving gear 303. The driving motor 301 is fixedly mounted on the left rear portion of the upper end surface of the support plate 105, and the driving gear 303 is fixedly mounted on the rotating shaft of the driving motor 301. The passive gear 302 is fixedly mounted on the outer upper end of the valve stem 2, and the passive gear 302 is meshed with the driving gear 303. The diameter of the passive gear 302 is three to four times the diameter of the driving gear 303, so that the driving gear 303 is more labor-saving when rotating with the passive gear 302, so that only a smaller driving motor 301 is needed to realize the driving effect on the valve stem 2.

[0050] The automatic pushing mechanism 4 includes an electric cylinder 401, a pushing plate 402, a transverse guide rod 403 and a sliding sleeve 404. The electric cylinder 401 is fixedly installed on the top of the U-shaped sliding frame 1012, and the left end of the telescopic rod of the electric cylinder 401 is fixedly connected to the pushing plate 402, and the front and rear sides of the right end of the pushing plate 402 are fixedly connected to a transverse guide rod 403, and each transverse guide rod 403 is slidably connected to a sliding sleeve 404 on the outside, and the sliding sleeve 404 is fixedly connected to the outside of the electric cylinder 401; through the setting of the automatic pushing mechanism 4, it can automatically move left and right with the one-way limit mechanism 5.

[0051] The one-way limiting mechanism 5 comprises a rectangular slide 501, a rectangular slide column 502, a tightening block 503, a triangular one-way limiting block 504 and a limiting block 505. The rectangular slide 501 is fixedly mounted in the middle of the left end face of the push plate 402, and the rectangular slide column 502 is slidably connected inside the rectangular slide 501, and the tightening block 503 is fixedly connected to the left end of the rectangular slide column 502, and the triangular one-way limiting block 504 is arranged on the left end face of the tightening block 503; the rectangular slide 501 is provided with four rectangular openings on the outside, and the rectangular slide column 502 is fixedly connected to the Four limit blocks 505 are connected, and the four limit blocks 505 are respectively located in the four rectangular openings opened on the rectangular slide 501; when the one-way limit mechanism 5 is in the one-way limit state, the triangular one-way limit block 504 is in close contact with the right side of the outer circumference of the one-way wheel 202; through the setting of the one-way limit mechanism 5, the one-way limit mechanism 5 can be used to perform a one-way limit effect on the one-way wheel 202 and the valve stem 2 in a counterclockwise direction, thereby effectively avoiding the automatic closing of the opened circular valve flap 205 and the sealing block 206.

[0052] Embodiment 2, based on embodiment 1, as Figure 1 and Fig.10As shown in the figure, the insertion part 6 includes a rectangular housing 601, a rectangular slider 602, an insertion rod 603 and a handle 604. The rectangular housing 601 is fixedly installed on the inner bottom end surface of the U-shaped sliding frame 1012, and a rectangular slider 602 is slidably connected inside the rectangular housing 601. The bottom end surface of the rectangular slider 602 is fixedly connected to an insertion rod 603 passing through the lower part of the rectangular housing 601. A spring is arranged above the rectangular slider 602 inside the rectangular housing 601. The right end surface of the rectangular slider 602 is fixedly connected to a handle 604. When the insertion part 6 is in the limit state, the insertion rod 603 is inserted into the insertion hole 107. Through the cooperation of the U-shaped sliding frame 1012, the insertion part 6 and the insertion hole 107, when it is necessary to manually close this globe valve, only need to manually pull the handle 604 upward, which can drive the rectangular slider 602 and the insertion rod 603 to move upward, so that the insertion rod 603 is pulled out from the insertion hole 107. At this time, the U-shaped sliding frame 1012 loses the limiting effect on the upper part of the support plate 105, and then slide the U-shaped sliding frame 1012 to the right, which can drive the whole one-way limiting mechanism 5 to move to the right, so that the triangular one-way limiting block 504 is separated from the right outer peripheral surface of the one-way wheel 202. At this time, the sliding cylinder 203 will also start to move downward in a straight line under the elastic force of the top spring 207, driving the circular valve flap 205 and the sealing block 206 to move downward, and finally realizing the sealing of the circular groove 1010 and the conical through hole 1011.

[0053] The working principle of this embodiment: When in use, connect the inlet 101 and the outlet 102 in this globe valve to the oil pipeline. Subsequently, the oil inside the oil pipeline enters the valve body 1 through the inlet 101. When the circular valve flap 205 and the sealing block 206 are in the open state, the oil flowing into the valve body 1 then flows through the circular groove 1010, the conical through hole 1011 and the circular through hole opened at the bottom end surface of the stop block 109 and flows into the outlet 102, and flows out through the outlet 102.

[0054] When it is necessary to cut off the oil, by controlling the telescopic rod of the electric cylinder 401 to retract to the right, driving the whole one-way limiting mechanism 5 to move to the right, so that the triangular one-way limiting block 504 is separated from the right outer peripheral surface of the one-way wheel 202. At this time, the one-way wheel 202 and the valve rod 2 lose the one-way limiting effect of counterclockwise rotation (seen from top to bottom, as Figure 8 and Fig. 9As shown in the figure, since the elastic force of the push spring 207 is greater than the friction force between the spiral groove 209 and the spiral stripe 208, the sliding cylinder 203 at this time begins to move downward in a straight line under the elastic force of the push spring 207, thereby moving the circular valve flap 205 and the sealing block 206 downward, so that the lower conical surface of the sealing block 206 is in close contact with the inner circumferential surface of the conical through hole 1011, and at this time the circular valve flap 205 enters the circular groove 1010 to automatically seal the circular groove 1010 and the conical through hole 1011, and since the stop valve adopts a smooth closing method, the higher the oil pressure inside the inlet 101, the greater the downward pressure on the circular valve flap 205 and the sealing block 206 will be, and the greater the downward pressure on the circular valve flap 205 and the sealing block 206 will be, and the better the sealing effect will be, thereby effectively improving the stop effect of the stop valve.

[0055] Due to the downward elastic force of the push spring 207 and the pressure of the oil inside the inlet 101, the circular valve flap 205 and the sealing block 206 are more labor-saving when performing the downward closing operation, and can achieve a self-sealing effect.

[0056] When the circular valve flap 205 and the sealing block 206 need to be opened, it is only necessary to control the telescopic rod of the electric cylinder 401 to extend to the left, so that the one-way limiting mechanism 5 can move to the left as a whole, so that the triangular one-way limiting block 504 is in close contact with the right side of the outer peripheral surface of the one-way wheel 202, and then the drive motor 301 is started, and the rotating shaft of the drive motor 301 is controlled to drive the active gear 303 to rotate counterclockwise, thereby driving the passive gear 302, the valve stem 2 and the one-way wheel 202 to rotate clockwise. At this time, the arc surface of the fan-shaped tooth block on the outer peripheral surface of the one-way wheel 202 will easily slide over the inclined surface of the triangular one-way limiting block 504, so that the one-way wheel 202 and The valve stem 2 performs a one-way limit for clockwise rotation. During the clockwise rotation, the valve stem 2 will rotate clockwise with the spiral stripes 208. At this time, the sliding cylinder 203 moves upward in a straight line with the circular valve flap 205 and the sealing block 206 under the cooperation of the spiral stripes 208 and the spiral grooves 209, so that the circular valve flap 205 and the sealing block 206 can be opened. After opening, the one-way limit mechanism 5 can be used to perform a one-way limit on the one-way wheel 202 and the valve stem 2 in a counterclockwise direction, thereby effectively avoiding the automatic closing of the opened circular valve flap 205 and the sealing block 206, thereby improving the reliability of the stop valve when in use.

[0057] In this article, there are a few points to note:

[0058] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0059] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0060] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A pressure self-sealing stop valve with closing and unloading function, comprising: Valve body (1), an inlet port (101) is provided on the right side of the valve body (1), and an outlet port (102) is provided on the left side of the valve body (1). A valve cover (103) is installed on the upper end of the valve body (1); characterized in that, a sealing shaft sleeve (104) is provided in the middle of the upper end surface of the valve cover (103), and a support plate (105) is fixedly installed outside the sealing shaft sleeve (104) on the upper end surface of the valve cover (103). A valve stem (2) is rotatably connected inside the sealing shaft sleeve (104), and a spiral stripe (208) is provided on the lower side of the outer peripheral surface of the valve stem (2). The lower end of the valve stem (2) is connected to a sliding cylinder (203) through the spiral stripe (208), and a circular valve flap (205) is fixedly connected to the lower end of the sliding cylinder (203). A top push spring (207) is sleeved outside the valve stem (2) between the sliding cylinder (203) and the valve cover (103); A driving mechanism (3) is installed on the upper end surface of the support plate (105). Two T-shaped chutes (106) are opened on the right side of the upper end surface of the support plate (105), and a C-shaped sliding frame (1012) is slidably connected to the two T-shaped chutes (106). An automatic top push mechanism (4) is fixedly installed on the upper end surface of the C-shaped sliding frame (1012), and a one-way limiting mechanism (5) is provided at the left end of the automatic top push mechanism (4); A plug-in part (6) is installed on the inner bottom end surface of the C-shaped sliding frame (1012).

2. A pressure self-sealing stop valve with load-releasing function according to claim 1, characterized in that: A plug-in hole (107) is opened on the right side of the upper end surface of the support plate (105); Two T-shaped sliders are provided on the bottom end surface of the C-shaped sliding frame (1012), and the two T-shaped sliders are respectively slidably connected to the two T-shaped chutes (106).

3. According to claim 1, a pressure self-sealing stop valve with unloading function and closing function, characterized in that: A cut-off block (109) is provided inside the valve body (1), and a circular groove (1010) is opened in the middle of the upper end surface of the cut-off block (109). A conical through hole (1011) is opened on the bottom end surface inside the circular groove (1010). The diameter of the inner peripheral surface of the circular groove (1010) is equal to the diameter of the outer peripheral surface of the circular valve flap (205). A circular through hole communicating with the conical through hole (1011) is opened in the middle of the bottom end surface of the cut-off block (109); Four strip-shaped chutes (108) are arranged in an annular array on the inner peripheral surface of the upper part of the valve body (1).

4. A pressure self-sealing stop valve with load-releasing function according to claim 1, characterized in that: A rotating handwheel (201) is provided at the upper end of the valve stem (2), and a one-way wheel (202) is fixedly installed at the upper end of the valve stem (2). Sector-shaped tooth blocks are arranged in an annular array on the outer peripheral surface of the one-way wheel (202).

5. According to claim 3, a pressure self-sealing stop valve with unloading function of closing, characterized in that: Four strip-shaped sliders (204) are arranged in an annular array on the outer peripheral surface of the sliding cylinder (203), and the four strip-shaped sliders (204) are respectively slidably connected to the four strip-shaped chutes (108); A spiral groove (209) is opened on the inner peripheral surface of the sliding cylinder (203), and the spiral groove (209) is connected to the spiral stripe (208); The elastic force of the top push spring (207) is greater than the friction force between the spiral groove (209) and the spiral stripe (208).

6. A pressure self-sealing stop valve with load-releasing function according to claim 1, characterized in that: A sealing block (206) is provided at the bottom of the circular valve flap (205), and the lower outer peripheral surface of the sealing block (206) is a conical surface.

7. The pressure self-sealing stop valve with normal closing and unloading according to claim 1 is characterized in that: The driving mechanism (3) comprises a driving motor (301), a passive gear (302) and a driving gear (303); the driving motor (301) is fixedly mounted on the left rear portion of the upper end surface of the support plate (105); the driving gear (303) is fixedly mounted on the rotating shaft of the driving motor (301); the passive gear (302) is fixedly mounted on the outer upper end of the valve stem (2); the passive gear (302) is meshed with the driving gear (303); and the diameter of the passive gear (302) is three to four times the diameter of the driving gear (303).

8. The pressure self-sealing stop valve with normal closing and unloading according to claim 1 is characterized in that: The automatic pushing mechanism (4) comprises an electric cylinder (401), a pushing plate (402), a transverse guide rod (403) and a sliding sleeve (404); the electric cylinder (401) is fixedly mounted on the top of a U-shaped sliding frame (1012); the left end of the telescopic rod of the electric cylinder (401) is fixedly connected to the pushing plate (402); the front and rear sides of the right end of the pushing plate (402) are fixedly connected to a transverse guide rod (403); the outside of each transverse guide rod (403) is slidably connected to a sliding sleeve (404); and the sliding sleeve (404) is fixedly connected to the outside of the electric cylinder (401).

9. The pressure self-sealing stop valve with normal closing and unloading according to claim 1 is characterized in that: The one-way limiting mechanism (5) comprises a rectangular slide cylinder (501), a rectangular slide column (502), a tightening block (503), a triangular one-way limiting block (504) and a limiting block (505); the rectangular slide cylinder (501) is fixedly mounted on the middle part of the left end surface of the push plate (402); the rectangular slide column (502) is slidably connected inside the rectangular slide cylinder (501); the left end of the rectangular slide column (502) is fixedly connected to the tightening block (503); the left end of the tightening block (503) A triangular one-way limit block (504) is arranged on the surface; four rectangular openings are opened on the outside of the rectangular slide cylinder (501); four limit blocks (505) are fixedly connected to the rectangular slide column (502), and the four limit blocks (505) are respectively located in the four rectangular openings opened on the rectangular slide cylinder (501); when the one-way limit mechanism (5) is in the one-way limit state, the triangular one-way limit block (504) is in close contact with the right side of the outer peripheral surface of the one-way wheel (202).

10. The pressure self-sealing stop valve with normal closing and unloading according to claim 2 is characterized in that: The plug-in portion (6) comprises a rectangular shell (601), a rectangular slider (602), a plug-in rod (603) and a handle (604); the rectangular shell (601) is fixedly mounted on the inner bottom end surface of the U-shaped sliding frame (1012); the rectangular slider (602) is slidably connected inside the rectangular shell (601); the bottom end surface of the rectangular slider (602) is fixedly connected to the plug-in rod (603) penetrating the lower part of the rectangular shell (601); a spring is arranged on the upper side of the rectangular slider (602) inside the rectangular shell (601); the right end surface of the rectangular slider (602) is fixedly connected to the handle (604); when the plug-in portion (6) is in a limited position state, the plug-in rod (603) is plugged into the plug-in hole (107).

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