Spiral separation parallel type double-gate-plate forced sealing gate valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a spiral separation parallel type double-gate-plate forced sealing gate valve which comprises a valve body, a valve plate assembly and a valve rod are arranged in a valve cavity, and parallelogram-like tooth-shaped long spiral threads are arranged on the peripheral wall of the valve rod. The longitudinal section of the spiral thread is provided with a first driving wedge surface and a second driving wedge surface which are oppositely arranged, the two valve plates are each provided with a spiral thread groove matched with the long spiral thread, and the longitudinal section of each spiral thread groove comprises a first matching wedge surface and a second matching wedge surface; a long spiral structure is adopted between the valve rod and the double valve plates, upward pulling force of the valve rod enables spiral threads to act so that a gap between the double valve plates is reduced, no friction force exists between the valve rod and the valve seat during lifting after separation, and downward pushing force of the valve rod enables the spiral threads to act so that the gap between the double valve plates is increased when the valve plates are closed. The sealing force of the valve plate to the valve seat is increased to achieve a forced sealing effect, and the spiral threads penetrate through the middles of the double valve plates, so that acting force is distributed more uniformly.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a spiral separation parallel type double-gate forced sealing gate valve. Background Art

[0002] The gate valve has a valve plate for opening and closing, and the movement direction of the valve plate is perpendicular to the direction of the fluid. The separation methods of the parallel double-disc gate valve can be divided into: 1. Wedge-shaped plate type between the double gate plates; 2. Wedge type at the end of the valve stem; 3. Middle spring action plate type; 4. Upper and lower wedge-shaped plate type.

[0003] The existing upper and lower wedge-shaped plate type and stem end wedge-shaped double-valve plate gate valves use the wedge shape and valve stem thrust to apply the sealing force of the double valve plates to the valve seat, resulting in uneven force on the valve plate to the valve seat. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the problem that the double valve plate gate valve in the prior art applies the sealing force of the double valve plate to the valve seat by the wedge shape and the thrust of the valve stem, and there is a current problem that the valve plate is subjected to uneven force on the valve seat, a spiral separation parallel double valve plate forced sealing gate valve is now provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a spiral separation parallel double-gate forced sealing gate valve, including a valve body, a valve cavity is formed inside the valve body, the valve cavity has an inlet flow channel and an outlet flow channel, and a valve plate assembly for blocking the inlet flow channel and the outlet flow channel and a valve stem for driving the valve plate assembly to rise and fall are arranged inside the valve cavity, and valve seats are installed at one end of the inlet flow channel and the outlet flow channel close to the valve plate assembly;

[0006] The outer peripheral wall of the valve stem is provided with a spiral thread, and the longitudinal section of the spiral thread has a first driving wedge surface and a second driving wedge surface arranged oppositely;

[0007] The valve plate assembly includes two valve plates that can be moved closer to or farther from each other, and a spiral thread groove that matches the spiral thread is formed on one side of the two valve plates that are closer to each other, and the longitudinal section of the spiral thread groove includes a first matching wedge surface and a second matching wedge surface that are arranged opposite to each other;

[0008] When the valve stem moves upward, the first driving wedge surface contacts the first matching wedge surface to drive the two valve plate assemblies closer to each other; when the valve stem moves downward, the second driving wedge surface contacts the second matching wedge surface to drive the two valve plates away from each other.

[0009] Furthermore, the first driving wedge surface, the second driving wedge surface, the first matching wedge surface and the second matching wedge surface are all gradually inclined downward in a direction approaching the valve stem.

[0010] Furthermore, a separation sleeve is fixed to one side of the two valve plates close to each other, and the spiral thread groove is provided on the separation sleeve.

[0011] Furthermore, the transverse cross-sections of the spiral thread and the spiral thread groove are mutually matching dovetail structures.

[0012] Furthermore, a limiting groove is provided at the upper end of the valve plate, and the valve stem protrudes radially to form a limiting protrusion that cooperates with the limiting groove, and a height H of the limiting groove is greater than a height h of the limiting protrusion.

[0013] Furthermore, an inclined surface is provided at the bottom of the valve plate, and the two inclined surfaces gradually move away from each other from top to bottom. An upper valve cover is provided at the top of the valve body and a lower valve cover is provided at the bottom. The lower valve cover protrudes upward to form a core shaft, and the core shaft has a conical surface which is small at the top and large at the bottom and is used to cooperate with the inclined surface.

[0014] Furthermore, the core shaft head is provided with an elastic deformation groove.

[0015] Furthermore, a guide wheel is provided between the two valve plates, and a plug rod is formed on both ends of the guide wheel along the axial direction. The valve plate is provided with a plug hole for inserting the plug rod, and the valve cavity is provided with a longitudinal track for the guide wheel to roll.

[0016] The beneficial effects of the utility model are as follows: the utility model adopts a double-headed long spiral threaded valve stem with a parallelogram-like tooth profile, and adopts a long spiral structure between the valve stem and the double valve plates. The upward pulling force of the valve stem causes the spiral thread to act to reduce the gap between the double valve plates. When the valve plates are in the closed position, the downward thrust of the valve stem causes the lower cone surface of the spiral thread to act to increase the gap between the double valve plates, thereby increasing the sealing force of the valve plate on the valve seat to achieve a forced sealing effect, and the spiral thread runs through the middle of the double valve plates to make the force distribution more uniform.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is the front view of the utility model;

[0020] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0021] Figure 3 It is a top view of the utility model;

[0022] Figure 4 yes Figure 2 A partial enlarged view of part B;

[0023] Figure 5 It is a schematic diagram of the structure of the valve stem;

[0024] Figure 6 It is a schematic diagram of the structure of the separation sleeve;

[0025] In the figure:

[0026] 1. Valve body; 101. Liquid inlet channel; 102. Liquid outlet channel; 103. Track;

[0027] 2. valve stem; 201. spiral thread; 2011. first driving wedge surface; 2012. second driving wedge surface; 202. limiting protrusion; 203. limiting step;

[0028] 3. Valve plate; 301. Spiral thread groove; 3011. First matching wedge surface; 3012. Second matching wedge surface; 302. Limiting groove; 303. Insert hole; 304. Inclined surface; 305. Separation sleeve;

[0029] 4. Upper valve cover;

[0030] 5. lower valve cover; 501. core shaft; 5011. cone surface; 5012. elastic deformation groove;

[0031] 6. Guide wheel; 601. Insertion rod;

[0032] 7. Valve seat. DETAILED DESCRIPTION

[0033] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0034] like Figure 1-Figure 6 As shown, a spiral separation parallel double-gate forced sealing gate valve includes a valve body 1, a valve cavity is formed inside the valve body 1, the valve cavity has an inlet channel 101 and an outlet channel 102, and a valve plate assembly for blocking the inlet channel 101 and the outlet channel 102 and a valve stem 2 for driving the valve plate assembly to rise and fall are arranged inside the valve cavity, and valve seats 7 are installed at one end of the inlet channel 101 and the outlet channel 102 close to the valve plate assembly; when the valve plate assembly moves down to contact with the valve seat 7, the liquid channel and the outlet channel 102 can be blocked, and the valve is in a closed state at this time; when the valve plate assembly moves up to separate from the valve seat 7, the inlet channel 101 and the outlet channel 102 can be connected, and the valve is in an open state at this time.

[0035] The outer peripheral wall of the valve stem 2 is provided with a spiral thread 201, and the longitudinal section of the spiral thread 201 has a first driving wedge surface 2011 and a second driving wedge surface 2012 which are arranged opposite to each other, and the first driving wedge surface 2011 is located above the second driving wedge surface 2012, that is, the longitudinal section of the spiral thread 201 is a parallelogram-like structure;

[0036] The valve plate assembly includes two valve plates 3 that can be close to or away from each other. A spiral thread groove 301 that cooperates with the spiral thread 201 is opened on the side where the two valve plates 3 are close to each other. The longitudinal section of the spiral thread groove 301 includes a first mating wedge surface 3011 and a second mating wedge surface 3012 that are arranged opposite to each other, and the first mating wedge surface 3011 is located above the second mating wedge surface 3012, that is, the longitudinal section of the spiral thread groove 301 is also a parallelogram-like structure, and the spiral thread groove 301 and the spiral thread 201 are both long spiral structures.

[0037] by Figure 2 For example, when the valve stem 2 moves upward (along Figure 2 In the X1 direction), the first driving wedge surface 2011 contacts the first matching wedge surface 3011 to drive the valve plate 3 to move leftward (along Figure 2 Y1 direction), the distance between the two valve plates 3 decreases; when the valve stem 2 moves down (along Figure 2 X2 direction), the second driving wedge surface 2012 contacts the second matching wedge surface 3012 to drive the valve plate 3 to move rightward (along Figure 2 Y2 direction), at this time, the distance between the two valve plates 3 increases.

[0038] During operation, when the external driving mechanism drives the valve stem 2 to move downward, the second driving wedge surface 2012 abuts against the second matching wedge surface 3012, and the second driving wedge surface 2012 pushes the second matching wedge surface 3012 to move outward, that is, the valve stem 2 pushes the valve plate 3 to move outward, the distance between the two valve plates 3 increases, and the action force between the valve plate 3 and the valve seat 7 increases, thereby achieving a forced sealing effect; when the external driving mechanism drives the valve stem 2 to move upward, the first driving wedge surface 2011 abuts against the first matching wedge surface 3011, and the first driving wedge surface 2011 pulls the first matching wedge surface 3011 to move inward, that is, the valve stem 2 pulls the valve plate 3 to move inward, the distance between the two valve plates 3 decreases, and the valve plate 3 is separated from the valve seat, so that there is no friction when the valve plate 3 is lifted.

[0039] In some examples, the first driving wedge surface 2011, the second driving wedge surface 2012, the first mating wedge surface 3011 and the second mating wedge surface 3012 are gradually inclined downward in the direction close to the valve stem 2, so that the two valve plates 3 are pulled closer to each other when the valve stem 2 moves upward, and the two valve plates 3 are pushed away from each other when the valve stem 2 moves downward.

[0040] In some examples, a separation sleeve 305 is fixed to the side of the two valve plates 3 close to each other, the spiral thread groove 301 is provided on the separation sleeve 305 , and a mounting groove for installing the separation sleeve 305 is provided on the valve plate 3 .

[0041] In some examples, the transverse cross-sections of the spiral thread 201 and the spiral thread groove 301 are mutually matched dovetail structures, thereby preventing the spiral thread 201 from slipping out of the spiral thread groove 301 .

[0042] In some examples, a limiting groove 302 is provided at the upper end of the valve plate 3, and the valve stem 2 protrudes radially to form a limiting protrusion 202 that cooperates with the limiting groove 302. The limiting protrusion 202 cooperates with the limiting groove 302 to realize the connection between the valve stem 2 and the valve plate 3, and the height H of the limiting groove 302 is greater than the height h of the limiting protrusion 202. The limiting protrusion 202 has a certain sliding space in the limiting groove 302, and the valve stem 2 is located above the limiting protrusion 202 and is also protruded with a limiting step 203; when the valve needs to be closed, the valve stem 2 moves downward, and first the upper groove wall of the limiting groove 302 of the valve plate 3 and the upper limit of the valve stem 2 are moved together under the action of gravity. The abutment of the positioning protrusion 202 causes the valve plate 3 and the valve stem 2 to move downward synchronously. When the valve plate 3 moves down to the position, the valve stem 2 continues to move downward, and the limiting protrusion 202 slides in the limiting groove 302. The valve plate 3 remains in a constant position in the longitudinal direction. During the downward movement of the valve stem 2, the two valve plates 3 are driven to move away from each other to achieve a forced seal; when the valve needs to be opened, the valve stem 2 moves up. At this time, the limiting protrusion 202 slides in the limiting groove 302. The valve plate 3 remains in a constant position in the longitudinal direction. During the upward movement of the valve stem 2, the two valve plates 3 are driven to move closer to each other until they are separated from the valve seat 7. When the valve stem 2 moves up until the limiting protrusion 202 abuts against the upper groove wall of the limiting groove 302, it drives the valve plate 3 to move upward synchronously.

[0043] In some examples, a slope 304 is provided at the bottom of the valve plate 3, and the two slopes 304 gradually move away from each other from top to bottom. An upper valve cover 4 is provided on the top of the valve body 1 and a lower valve cover 5 is provided on the bottom. The lower valve cover 5 protrudes upward to form a core shaft 501. The core shaft 501 has a conical surface 5011 which is small at the top and large at the bottom and is used to cooperate with the slope 304. In the process of the valve stem 2 driving the valve plate 3 to move downward, the slope 304 cooperates with the conical surface 5011 to make the two valve plates 3 move away from each other.

[0044] In some examples, an elastic deformation groove 5012 is provided at the head of the core shaft 501 , so that the core shaft 501 has a certain elasticity, and a better sealing effect can be achieved between the valve plate 3 and the valve seat 7 when the two valve plates 3 are stretched apart.

[0045] In some examples, a guide wheel 6 is provided between two valve plates 3, and an insertion rod 601 is formed at both ends of the guide wheel 6 axially protruding. The valve plate 3 is provided with a plug hole 303 for inserting the insertion rod 601, and the valve cavity is provided with a longitudinal track 103 for the guide wheel 6 to roll. The guide wheel 6 cooperates with the track 103 to guide the lifting process of the valve plate 3.

[0046] Working principle:

[0047] When the valve needs to be closed, the external driving mechanism drives the valve stem 2 to move downward. First, under the action of gravity, the upper groove wall of the limit groove 302 of the valve plate 3 abuts against the upper limit protrusion 202 of the valve stem 2, so that the valve plate 3 and the valve stem 2 move downward synchronously. When the valve plate 3 moves down to the right position, the valve stem 2 continues to move downward, and the position of the valve plate 3 in the longitudinal direction remains unchanged. The second driving wedge surface 2012 abuts against the second matching wedge surface 3012, and the second driving wedge surface 2012 pushes the second matching wedge surface 3012 to move outward, that is, the valve stem 2 pushes the valve plate 3 to move outward, and the distance between the two valve plates 3 increases, thereby increasing the acting force between the valve plate 3 and the valve seat, thereby achieving a forced sealing effect.

[0048] When the valve needs to be opened, the valve stem 2 moves upward. At this time, the limiting protrusion 202 slides in the limiting groove 302, and the valve plate 3 remains in the longitudinal position. During the upward movement of the valve stem 2, the first driving wedge surface 2011 abuts against the first matching wedge surface 3011, and the first driving wedge surface 2011 pushes the first matching wedge surface 3011 to move inward, that is, the valve stem 2 pulls the valve plate 3 to move inward, and the distance between the two valve plates 3 is reduced, thereby causing the valve plate 3 to separate from the valve seat, so that there is no friction when the valve plate 3 is lifted. When the valve stem 2 moves upward until the limiting protrusion 202 abuts against the upper groove wall of the limiting groove 302, it drives the valve plate 3 to move upward synchronously.

[0049] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A spiral separation parallel double-disc forced sealing gate valve, characterized in that: The invention comprises a valve body (1), wherein a valve cavity is formed inside the valve body (1), wherein the valve cavity has a liquid inlet flow channel (101) and a liquid outlet flow channel (102), and a valve plate assembly for blocking the liquid inlet flow channel (101) and the liquid outlet flow channel (102) and a valve stem (2) for driving the valve plate assembly to rise and fall are arranged inside the valve cavity, and valve seats (7) are installed at one end of the liquid inlet flow channel (101) and the liquid outlet flow channel (102) close to the valve plate assembly; The outer peripheral wall of the valve stem (2) is provided with a spiral thread (201), and the longitudinal section of the spiral thread (201) has a first driving wedge surface (2011) and a second driving wedge surface (2012) arranged opposite to each other; The valve plate assembly comprises two valve plates (3) that can approach or move away from each other, and a spiral thread groove (301) that matches the spiral thread (201) is formed on one side of the two valve plates (3) that are close to each other, and a longitudinal section of the spiral thread groove (301) comprises a first matching wedge surface (3011) and a second matching wedge surface (3012) that are arranged opposite to each other; When the valve stem (2) moves upward, the first driving wedge surface (2011) contacts the first matching wedge surface (3011) to drive the two valve plates (3) closer to each other; when the valve stem (2) moves downward, the second driving wedge surface (2012) contacts the second matching wedge surface (3012) to drive the two valve plates (3) away from each other.

2. According to claim 1, a spiral separation parallel double-disc forced sealing gate valve is characterized by: The first driving wedge surface (2011), the second driving wedge surface (2012), the first matching wedge surface (3011) and the second matching wedge surface (3012) are all gradually inclined downward in a direction approaching the valve stem (2).

3. According to claim 1, a spiral separation parallel double-disc forced sealing gate valve is characterized by: A separation sleeve (305) is fixed on one side of the two valve plates (3) that are close to each other, and the spiral thread groove (301) is provided on the separation sleeve (305).

4. The spiral separation parallel double-disc forced sealing gate valve according to claim 1, characterized in that: The transverse cross-sections of the spiral thread (201) and the spiral thread groove (301) are mutually matching dovetail-shaped structures.

5. The spiral separation parallel double-disc forced sealing gate valve according to claim 3, characterized in that: The valve plate (3) has a limit groove (302) at its upper end, the valve stem (2) protrudes radially to form a limit protrusion (202) that cooperates with the limit groove (302), and a height H of the limit groove (302) is greater than a height h of the limit protrusion (202).

6. The spiral separation parallel double-disc forced sealing gate valve according to claim 1, characterized in that: The bottom of the valve plate (3) is provided with an inclined surface (304), and the two inclined surfaces (304) gradually move away from each other from top to bottom. The top of the valve body (1) is provided with an upper valve cover (4) and the bottom is provided with a lower valve cover (5). The lower valve cover (5) protrudes upward to form a core shaft (501), and the core shaft (501) has a conical surface (5011) that is smaller at the top and larger at the bottom and is used to cooperate with the inclined surface (304).

7. The spiral separation parallel double-disc forced sealing gate valve according to claim 6, characterized in that: The core shaft (501) has a head formed thereon with an elastic deformation groove (5012).

8. The spiral separation parallel double-disc forced sealing gate valve according to claim 1, characterized in that: A guide wheel (6) is provided between the two valve plates (3), and an insertion rod (601) is formed on both ends of the guide wheel (6) protruding along the axial direction. The valve plate (3) is provided with an insertion hole (303) for the insertion of the insertion rod (601), and the valve cavity is provided with a longitudinal track (103) for the guide wheel (6) to roll.

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