Y-shaped composite multi-seal stop valve

Abstract

The invention provides a Y-shaped composite multi-seal stop valve, which belongs to the technical field of stop valves and comprises a valve body, a sealing seat and a valve block, the sealing seat and the valve block are arranged on the valve body, a first valve seat and a second valve seat are respectively arranged in the valve body, and a sealing groove is arranged at the upper end of the valve body. According to the valve, the adjusting block is matched with the wedge-shaped block to force the second sealing plug to seal the second valve seat while sealing of the first valve seat is completed, and medium leakage can still be prevented under the condition that sealing of the first sealing plug fails, so that the overall sealing reliability of the valve is improved; the piston rod is matched with the annular air bag to inflate the air bag in the secondary sealing process of the valve, so that the side wall of the air bag tightly abuts against the inner walls of the sealing groove and the annular groove to complete sealing, expansion can be freely conducted according to pressure changes, sufficient attachment can still be conducted even under the condition that the sealing face deforms, and the sealing effect is good. And the gap is actively filled, the better sealing effect can be improved, and then the sealing effect of the whole valve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, and in particular to a Y-type composite multi-seal stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. When the medium enters the valve from under the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem must be larger, otherwise the valve stem will bend. The Y-type stop valve is a type of stop valve. Because the Y-type stop valve has a nearly straight flow channel design, it has low flow resistance and higher flow capacity compared to the general straight-through stop valve, and is widely used.

[0003] In the prior art, the traditional Y-type composite stop valve usually adopts a single-layer seal. When the seal is washed by the medium inside the valve for a long time, the sealing surface of the seal will cause wear, thereby affecting the sealing reliability of the valve. At the same time, because the single-layer sealing surface is easily damaged, more frequent maintenance and replacement are required, which increases the maintenance cost. How to invent a Y-type composite multi-seal stop valve to solve these problems has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a Y-type composite multi-seal stop valve, which aims to solve the problem that traditional Y-type composite stop valves usually adopt single-layer sealing and have poor valve sealing reliability.

[0005] The present invention is achieved in that:

[0006] The present invention provides a Y-type composite multi-seal stop valve, comprising a valve body, a sealing seat and a valve block arranged on the valve body, wherein a first valve seat and a second valve seat are respectively provided inside the valve body, and a sealing groove is provided at the upper end of the valve body;

[0007] The end side wall of the sealing seat and the inner wall of the sealing groove are threadedly sealed, the two side walls of the sealing seat are equipped with support rods, the upper end of the support rods is equipped with a fixing seat, and a sleeve is installed between the fixing seat and the sealing seat;

[0008] A first sealing plug sealingly contacting the first valve seat is installed at the bottom end of the valve block, an adjusting cavity is provided inside the valve block, a valve stem is installed on the inner wall of the adjusting cavity, an adjusting block is installed on one end of the valve stem, a threaded groove is provided on one end of the valve stem, a screw is installed on the inner wall of the threaded groove, a mounting shaft is installed on the upper end of the screw, and a handwheel is installed on one end of the mounting shaft.

[0009] Preferably, both ends of the sleeve are fixedly connected to the sealing seat and one side of the fixing seat respectively, the inner wall of the sleeve is installed with four axially symmetrical sliding strips, and the outer wall of the first sealing plug is installed with a sealing ring.

[0010] The inner wall of the regulating cavity is slidably connected to the outer wall of the regulating block, the outer wall of the valve stem is provided with a sliding groove slidably connected to the outer wall of the sliding bar, and the outer wall of the screw is threadedly connected to the inner wall of the thread groove.

[0011] The two ends of the installation shaft are respectively fixedly connected to the screw rod and one side of the hand wheel, and the outer walls of the installation shaft and the screw rod are rotatably connected to the inner wall of the fixing seat.

[0012] Preferably, an adjusting groove is formed on the side wall of the valve block close to the second valve seat, an adjusting spring is fixedly connected to the inner wall of the adjusting groove, a second sealing plug is fixedly connected to the side wall at one end of the adjusting spring, the second sealing plug is in sealing contact with the second valve seat, the inner wall of the second sealing plug is slidably connected to the inner wall of the adjusting groove, a sliding rod is installed at one end of the second sealing plug, and a wedge block slidably connected to the inner wall of the adjusting chamber is installed at one end of the sliding rod.

[0013] One side of the adjusting block is provided with an inclined surface, and the inclined surface of the adjusting block is slidably connected with the inclined surface of the wedge block.

[0014] By adopting the above technical solution, when the valve body is closed, the hand wheel is turned to make the screw drive the valve stem to move downward. When the adjusting block at the end of the valve stem contacts the wedge block on one side, the valve stem is continued to be moved so that it drives the valve block to move downward at the same time under the limit of the adjusting block and the wedge block, so that the first sealing plug closes the first valve seat and completes the overall closure of the valve body. Then, the valve stem is continued to be moved to overcome the pressure of the adjusting spring. The adjusting block squeezes the wedge block on one side through the inclined surface so that the second sealing plug at one end of the slide rod pulls the adjusting spring to move toward one end of the second valve seat. While the valve stem is limited by the wedge block and the valve block is sealed to the first valve seat, the inclined surface design of the wedge block and the adjusting block enables it to slide when subjected to a large pressure, effectively changing the position of the second sealing plug until the second sealing plug seals and closes the second valve seat, completing the secondary sealing of the valve body, and can still prevent the leakage of the medium when the sealing of the first sealing plug fails, thereby improving the overall sealing reliability of the valve. At the same time, the design of multiple seals can extend the maintenance cycle of the valve, reduce frequent repairs caused by sealing failure, and reduce maintenance costs.

[0015] Preferably, a piston cavity is provided on the inner wall at the bottom end of the regulating cavity, an airway is provided at one end of the piston cavity, an annular groove is provided on the outer wall of the first sealing plug close to the airway, a sealing groove is provided on the inner wall of the first valve seat close to the annular groove, an annular airbag connected to the airway is installed on the inner wall of the annular groove, a piston rod is installed on the inner wall of the piston cavity, a piston connected to the piston of the inner wall of the piston cavity is installed on one end of the piston rod, an extrusion spring fixedly connected to the inner wall of the piston cavity is installed on one end of the piston, and one end of the piston rod abuts against the regulating block.

[0016] By adopting the above technical solution, the annular airbag installed in the annular groove is not fully expanded initially. After the first sealing plug at the lower end of the valve block completes the sealing of the first valve seat, the valve stem that continues to move downward forces the second sealing plug to seal the second valve seat. During the process, the side of the valve stem abuts against the piston rod below, and during the movement, the piston at the end of the piston rod slides downward on the inner wall of the piston cavity, thereby compressing the air inside the cavity, thereby forcing the air inside the original cavity to enter the annular airbag through the airway to inflate it. At this time, the annular airbag is fully expanded to increase its outer diameter and penetrate into the sealing groove, and its side walls are tightly abutted against the inner walls of the sealing groove and the annular groove to complete the sealing, thereby limiting the valve block to prevent the structure of the sealing from loosening. The annular airbag can expand freely according to the change of pressure, and can still be fully fitted even when the sealing surface is deformed, actively filling the gap, which can improve the sealing effect, thereby improving the sealing effect of the entire valve.

[0017] The beneficial effects of the present invention are:

[0018] The adjusting block cooperates with the wedge block to force the second sealing plug to seal the second valve seat while the first valve seat is sealed. This can prevent leakage of the medium when the first sealing plug fails to seal, thereby improving the overall sealing reliability of the valve. At the same time, the multiple sealing design can extend the maintenance cycle of the valve, reduce frequent repairs caused by sealing failure, and reduce maintenance costs;

[0019] The piston rod is arranged to cooperate with the annular airbag to inflate the airbag during the secondary sealing process of the valve, so that its side wall is tightly against the inner wall of the sealing groove and the ring groove to complete the sealing. It can expand freely according to the change of pressure, and can still be fully fitted even when the sealing surface is deformed, and the gap can be actively filled, which can improve the sealing effect better, thereby improving the sealing effect of the entire 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 required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of a Y-type composite multi-seal stop valve provided in an embodiment of the present invention;

[0022] Figure 2 It is a partial cross-sectional view of a Y-type composite multi-seal stop valve provided by an embodiment of the present invention;

[0023] Figure 3 It is a half-section diagram showing the local structure of a Y-type composite multi-seal stop valve provided in an embodiment of the present invention;

[0024] Figure 4 A Y-type composite multi-seal stop valve structure provided by the embodiment of the present invention Figure 3 A magnified view of the structure of the middle A area;

[0025] Figure 5 It is a cross-sectional view of a local component of a Y-type composite multi-seal stop valve structure in the valve opening and closing state provided by an embodiment of the present invention;

[0026] Figure 6 It is a half-section view of the overall structure of a Y-type composite multi-seal stop valve provided in an embodiment of the present invention;

[0027] Figure 7 It is a top sectional view of the overall structure of a Y-type composite multi-seal stop valve provided by an embodiment of the present invention;

[0028] Figure 8 A Y-type composite multi-seal stop valve structure provided by the embodiment of the present invention Figure 7 A magnified view of the structure of region B.

[0029] In the figure: 1. valve body; 11. first valve seat; 12. second valve seat; 13. sealing groove; 2. sealing seat; 21. support rod; 3. fixed seat; 31. sleeve; 32. slide bar; 4. valve block; 41. adjusting chamber; 42. first sealing plug; 43. sealing ring; 44. adjusting groove; 45. piston chamber; 46. airway; 47. annular groove; 5. valve stem; 51. adjusting block; 52. threaded groove; 53. slide groove; 6. screw; 7. mounting shaft; 8. hand wheel; 9. second sealing plug; 91. slide rod; 92. wedge block; 93. adjusting spring; 10. piston rod; 101. piston; 102. extrusion spring; 103. annular air bag. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example, see Figure 1-Figure 8 A Y-type composite multi-seal stop valve comprises a valve body 1, a sealing seat 2 and a valve block 4 arranged on the valve body 1, a first valve seat 11 and a second valve seat 12 are respectively provided inside the valve body 1, and a sealing groove 13 is provided at the upper end of the valve body 1;

[0032] The end side wall of the sealing seat 2 is threadedly sealed with the inner wall of the sealing groove 13. Support rods 21 are installed on both side walls of the sealing seat 2. A fixing seat 3 is installed on the upper end of the support rod 21. A sleeve 31 is installed between the fixing seat 3 and the sealing seat 2.

[0033] The bottom end of the valve block 4 is provided with a first sealing plug 42 which is in sealing contact with the first valve seat 11. The valve block 4 is provided with an adjusting chamber 41 inside. A valve stem 5 is provided on the inner wall of the adjusting chamber 41. An adjusting block 51 is provided on one end of the valve stem 5. A threaded groove 52 is provided on one end of the valve stem 5. A screw 6 is provided on the inner wall of the threaded groove 52. A mounting shaft 7 is provided on the upper end of the screw 6. A hand wheel 8 is provided on one end of the mounting shaft 7.

[0034] Further, the two ends of the sleeve 31 are respectively fixedly connected to the sealing seat 2 and one side of the fixed seat 3, the inner wall of the sleeve 31 is installed with four axially symmetrical slide bars 32, the outer wall of the first sealing plug 42 is installed with a sealing ring 43, the inner wall of the adjusting chamber 41 is slidably connected to the outer wall of the adjusting block 51, the outer wall of the valve stem 5 is provided with a slide groove 53 slidably connected to the outer wall of the slide bar 32, the outer wall of the screw 6 is threadedly connected to the inner wall of the thread groove 52, the two ends of the installation shaft 7 are respectively fixedly connected to the screw 6 and one side of the handwheel 8, the installation shaft 7 and the outer wall of the screw 6 are rotatably connected to the inner wall of the fixed seat 3, An adjusting groove 44 is provided on the side wall of the valve block 4 close to the second valve seat 12, an adjusting spring 93 is fixedly connected to the inner wall of the adjusting groove 44, a second sealing plug 9 is fixedly connected to the side wall of one end of the adjusting spring 93, the second sealing plug 9 is in sealing contact with the second valve seat 12, the inner wall of the second sealing plug 9 is slidably connected to the inner wall of the adjusting groove 44, a sliding rod 91 is installed at one end of the second sealing plug 9, a wedge block 92 slidably connected to the inner wall of the adjusting chamber 41 is installed at one end of the sliding rod 91, an inclined surface is provided on one side of the adjusting block 51, the inclined surface of the adjusting block 51 is slidably connected to the inclined surface of the wedge block 92.

[0035] It should be noted that: when closing the valve body 1, the hand wheel 8 is turned to make the screw 6 drive the valve stem 5 to move downward. When the adjusting block 51 at the end of the valve stem 5 contacts the wedge block 92 on one side, the valve stem 5 is continued to be moved so that it drives the valve block 4 to move downward at the same time under the limit of the adjusting block 51 and the wedge block 92, so that the first sealing plug 42 closes the first valve seat 11, completing the overall closure of the valve body 1, and then the valve stem 5 is continued to be moved to overcome the pressure of the adjusting spring 93. The adjusting block 51 on one side squeezes the wedge block 92 on one side through the inclined surface so that the second sealing plug 9 at one end of the slide rod 91 pulls the adjusting spring 93 toward one end of the second valve seat 12 The wedge block 92 is used to limit the valve stem 5 and the valve block 4 is used to seal the first valve seat 11. The inclined surface design of the wedge block 92 and the adjusting block 51 enables them to slide when subjected to a large pressure, thereby effectively changing the position of the second sealing plug 9 until the second sealing plug 9 seals and closes the second valve seat 12, completing the secondary sealing of the valve body 1. When the sealing of the first sealing plug 42 fails, the leakage of the medium can still be prevented, thereby improving the overall sealing reliability of the valve. At the same time, the design of multiple seals can extend the maintenance period of the valve, reduce frequent repairs due to sealing failure, and reduce maintenance costs.

[0036] Further, a piston cavity 45 is provided on the inner wall of the bottom end of the regulating cavity 41, an air passage 46 is provided on one end of the piston cavity 45, an annular groove 47 is provided on the outer wall of the first sealing plug 42 near the air passage 46, a sealing groove 13 is provided on the inner wall of the first valve seat 11 near the annular groove 47, an annular air bag 103 connected to the air passage 46 is installed on the inner wall of the annular groove 47, a piston rod 10 is installed on the inner wall of the piston cavity 45, a piston 101 connected to the inner wall of the piston cavity 45 is installed on one end of the piston rod 10, an extrusion spring 102 fixedly connected to the inner wall of the piston cavity 45 is installed on one end of the piston 101, and one end of the piston rod 10 is abutted against the regulating block 51

[0037] It should be noted that the annular airbag 103 installed in the annular groove 47 is not fully expanded at the beginning. After the first sealing plug 42 at the lower end of the valve block 4 completes the sealing of the first valve seat 11, the valve stem 5 continues to move downward to force the second sealing plug 9 to seal the second valve seat 12. The side of the valve stem 5 abuts against the piston rod 10 below, and during the movement, the piston 101 at the end of the piston rod 10 slides downward on the inner wall of the piston cavity 45, thereby compressing the air inside the cavity, thereby forcing the air inside the original cavity to enter through the airway 46. The annular airbag 103 is inserted into the annular airbag and inflated. At this time, the annular airbag 103 is fully expanded to increase its outer diameter and penetrate into the sealing groove 13, and its side wall is tightly against the inner wall of the sealing groove 13 and the annular groove 47 to complete the sealing, thereby limiting the valve block 4 to prevent the structure of the sealing part from loosening. The annular airbag 103 can expand freely according to the change of pressure, and can still be fully fitted even when the sealing surface is deformed, actively filling the gap, which can improve the better sealing effect, and thus improve the sealing effect of the entire valve.

[0038] The working principle of this Y-type composite multi-seal stop valve:

[0039] When closing the valve body 1, the hand wheel 8 is turned to make the screw 6 drive the valve stem 5 to move downward. When the adjusting block 51 at the end of the valve stem 5 contacts the wedge block 92 on one side, the valve stem 5 is continued to be moved so that it drives the valve block 4 to move downward at the same time under the limit of the adjusting block 51 and the wedge block 92, so that the first sealing plug 42 closes the first valve seat 11, completing the overall closure of the valve body 1. Then, the valve stem 5 is continued to be moved to overcome the pressure of the adjusting spring 93. The adjusting block 51 on one side squeezes the wedge block 92 on one side through the inclined surface to make the sliding rod 91 The second sealing plug 9 at one end pulls the adjusting spring 93 to move toward one end of the second valve seat 12, and the valve stem 5 is limited by the wedge block 92 to cooperate with the valve block 4 to seal the first valve seat 11. The inclined surface design of the wedge block 92 and the adjusting block 51 enables them to slide when subjected to a large pressure, effectively changing the position of the second sealing plug 9 until the second sealing plug 9 seals and closes the second valve seat 12, completing the secondary sealing of the valve body 1, and at the same time, the side of the valve stem 5 abuts against the piston rod 10 below, and in the moving During the process, the piston 101 at the end of the piston rod 10 slides downward on the inner wall of the piston cavity 45, thereby compressing the air inside the cavity, thereby forcing the air inside the original cavity to enter the annular airbag 103 through the airway 46 to inflate it. At this time, the annular airbag 103 is fully expanded to increase its outer diameter and penetrate into the sealing groove 13, and its side wall is tightly against the inner wall of the sealing groove 13 and the annular groove 47 to complete the seal, thereby limiting the valve block 4 to prevent the structure of the seal from loosening. The second sealing plug 9 can still prevent the leakage of the medium when the first sealing plug 42 fails to seal, thereby improving the overall sealing reliability of the valve. At the same time, the design of multiple seals can extend the maintenance cycle of the valve, reduce frequent maintenance caused by sealing failure, and reduce maintenance costs. At the same time, the annular airbag 103 can expand freely according to the change of pressure, and can still be fully fitted even when the sealing surface is deformed, and actively fill the gap, which can improve a better sealing effect, thereby improving the sealing effect of the entire valve.

[0040] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A Y-type composite multi-seal stop valve, comprising a valve body (1), a sealing seat (2) and a valve block (4) arranged on the valve body (1), characterized in that: The valve body (1) is provided with a first valve seat (11) and a second valve seat (12) respectively inside, and the upper end of the valve body (1) is provided with a sealing groove (13); The end side wall of the sealing seat (2) and the inner wall of the sealing groove (13) are threadedly sealed, the two side walls of the sealing seat (2) are equipped with support rods (21), the upper end of the support rod (21) is equipped with a fixing seat (3), and a sleeve (31) is installed between the fixing seat (3) and the sealing seat (2); A first sealing plug (42) is installed at the bottom end of the valve block (4) and is in sealing contact with the first valve seat (11). An adjusting chamber (41) is provided inside the valve block (4). A valve stem (5) is installed on the inner wall of the adjusting chamber (41). An adjusting block (51) is installed at one end of the valve stem (5). A threaded groove (52) is provided at one end of the valve stem (5). A screw rod (6) is installed on the inner wall of the threaded groove (52). A mounting shaft (7) is installed at the upper end of the screw rod (6). A hand wheel (8) is installed at one end of the mounting shaft (7).

2. A Y-type composite multi-seal stop valve according to claim 1, characterized in that: The two ends of the sleeve (31) are fixedly connected to the sealing seat (2) and one side of the fixing seat (3), respectively; the inner wall of the sleeve (31) is provided with four axially symmetrical sliding strips (32); and the outer wall of the first sealing plug (42) is provided with a sealing ring (43).

3. A Y-type composite multi-seal stop valve according to claim 2, characterized in that: The inner wall of the regulating chamber (41) is slidably connected to the outer wall of the regulating block (51); the outer wall of the valve stem (5) is provided with a sliding groove (53) slidably connected to the outer wall of the sliding bar (32); the outer wall of the screw rod (6) is threadedly connected to the inner wall of the thread groove (52).

4. A Y-type composite multi-seal stop valve according to claim 3, characterized in that: The two ends of the installation shaft (7) are respectively fixedly connected to the screw rod (6) and one side of the hand wheel (8), and the outer walls of the installation shaft (7) and the screw rod (6) are rotatably connected to the inner wall of the fixing seat (3).

5. A Y-type composite multi-seal stop valve according to claim 1, characterized in that: The valve block (4) is provided with an adjustment groove (44) on the side wall close to the second valve seat (12); an adjustment spring (93) is fixedly connected to the inner wall of the adjustment groove (44); and a second sealing plug (9) is fixedly connected to the side wall at one end of the adjustment spring (93).

6. A Y-type composite multi-seal stop valve according to claim 5, characterized in that: The second sealing plug (9) is in sealing contact with the second valve seat (12), the inner wall of the second sealing plug (9) is slidably connected to the inner wall of the regulating groove (44), a sliding rod (91) is installed at one end of the second sealing plug (9), and a wedge block (92) slidably connected to the inner wall of the regulating chamber (41) is installed at one end of the sliding rod (91).

7. A Y-type composite multi-seal stop valve according to claim 6, characterized in that: A slope is provided on one side of the adjusting block (51), and the slope of the adjusting block (51) is slidably connected to the slope of the wedge block (92).

8. A Y-type composite multi-seal stop valve according to claim 1, characterized in that: The inner wall at the bottom end of the regulating chamber (41) is provided with a piston chamber (45), an air passage (46) is provided at one end of the piston chamber (45), an annular groove (47) is provided on the outer wall of the first sealing plug (42) close to the air passage (46), a sealing groove (13) is provided on the inner wall of the first valve seat (11) close to the annular groove (47), and an annular air bag (103) connected to the air passage (46) is installed on the inner wall of the annular groove (47).

9. A Y-type composite multi-seal stop valve according to claim 8, characterized in that: A piston rod (10) is installed on the inner wall of the piston chamber (45); one end of the piston rod (10) is installed with a piston (101) connected to the inner wall of the piston chamber (45); one end of the piston (101) is installed with a compression spring (102) fixedly connected to the inner wall of the piston chamber (45); one end of the piston rod (10) is in contact with the adjustment block (51).

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