Corrugated pipe stop valve for ammonia

Abstract

The utility model relates to a corrugated pipe stop valve for ammonia, which comprises a valve body, a valve rod, a valve clack, a corrugated pipe and a valve seat, a flow channel is arranged in the valve body, the valve seat is arranged in the flow channel, the valve rod drives the valve clack to move and cuts off the flow channel with the valve seat, and the corrugated pipe is sleeved on the periphery of the valve rod and comprises a mounting pipe, a mounting block, a mounting spring, a fixed sleeve and a movable sleeve. The valve clack is provided with a center hole allowing the valve rod to enter, the valve rod is provided with a rod hole, the valve clack is further provided with a moving hole perpendicular to the center hole, the moving hole extends to be communicated with the center hole, the mounting pipe is connected into the moving hole in a threaded mode, and the mounting block is arranged in the mounting pipe in a sliding mode. The mounting spring is arranged in the mounting pipe and drives the mounting block to partially enter the rod hole to fix the valve rod and the valve clack, the fixed sleeve is arranged in the valve body and is opposite to the valve rod, the movable sleeve is arranged on the valve clack, the movable sleeve and the fixed sleeve form a closed cavity isolated from the flow channel, and the valve rod and the corrugated pipe are located in the closed cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stop valve, concretely relates to a corrugated pipe stop valve for ammonia. BACKGROUND

[0002] The stop valve is a switching device commonly used on medium conveying pipelines, which is composed of a valve body, a valve cover, a valve clapper, a valve rod and a transmission mechanism, a valve seat is arranged on the platform between the inlet and outlet passages of the valve body, the lower end surface of the valve clapper is provided with a sealing surface matched with the valve seat, the upper end surface is connected with the lower end of the valve rod, the upper end of the valve rod penetrates through the valve cover and is connected with the transmission mechanism on the bracket, the corrugated pipe stop valve for ammonia is a key valve specially used for ammonia medium, which is optimized in view of the strong corrosiveness, high permeability and low temperature characteristics of ammonia, and is widely used in the fields of refrigeration, chemical industry, liquid ammonia storage and transportation, etc., in order to realize zero external leakage of the valve and prevent the leakage of toxic, harmful, explosive and other dangerous media to the outside to cause safety accidents, a corrugated pipe sealing device is arranged between the valve rod and the valve cover to form a corrugated pipe stop valve structure, and zero leakage of the middle cavity is realized.

[0003] At present, after a long time of use, the deformation of the valve clapper may be caused, thereby affecting the subsequent sealing, meanwhile, the corrugated pipe is directly contacted with the medium, impurities in the medium may be easily accumulated in the corrugated space of the corrugated pipe, the corrugated space of the corrugated pipe is easily blocked, the corrugated pipe loses the expansion and contraction performance, and even the corrugated pipe is abraded and damaged, thereby causing the obstruction of the opening and closing of the valve. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims at providing a corrugated pipe stop valve for ammonia.

[0005] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a valve body, a valve rod, a valve clapper, a corrugated pipe and a valve seat are arranged, a flow channel is arranged in the valve body, the valve seat is arranged in the flow channel, the valve rod drives the valve clapper to move and cut off the flow channel with the valve seat, the corrugated pipe is sleeved on the outer periphery of the valve rod, a mounting pipe, a mounting block, a mounting spring, a fixing sleeve and a moving sleeve are arranged, a central hole for the valve rod to enter is arranged on the valve clapper, a rod hole is arranged on the valve rod, a moving hole perpendicular to the central hole and extending to be communicated with the central hole is further arranged on the valve clapper, the mounting pipe is threadedly connected in the moving hole, the mounting block is slidably arranged in the mounting pipe, the mounting spring is arranged in the mounting pipe and drives the mounting block to partially enter the rod hole to fix the valve rod and the valve clapper, the fixing sleeve is arranged in the valve body and opposite to the valve rod, the moving sleeve is arranged on the valve clapper and forms a sealed cavity with the flow channel with the fixing sleeve, the valve rod and the corrugated pipe are located in the sealed cavity.

[0006] By adopting the technical scheme, the cooperation of the mounting pipe, the mounting block and the mounting spring realizes quick locking and separation of the valve rod and the valve disc, simplifies the disassembly and assembly process, facilitates maintenance, the closed cavity structure formed by the fixed sleeve and the moving sleeve completely isolates the bellows from the flow channel, medium corrosion of the bellows is avoided, and the sealing reliability is significantly improved.

[0007] The utility model further sets up: mounting pipe including fixed part, transition part and installation part, the diameter of fixed part is greater than the diameter of installation part, transition part is located between fixed part and installation part, installation hole is set up in installation part and extends to be linked together with center hole, mounting block is located in installation hole, mounting spring is set up between installation hole bottom and mounting block.

[0008] By adopting the technical scheme, the fixed part, the transition part and the installation part of the mounting pipe are designed to make the installation hole and the center hole communicate, ensure uniform force of the mounting block and the spring, and enhance locking stability.

[0009] The utility model further sets up: fixed groove is set up in the fixed part and the fixed groove is regular hexagon, outer thread is set up on the circumference of fixed part, and the mounting pipe is provided with inner thread opposite to the inner thread.

[0010] By adopting the technical scheme, the regular hexagonal fixed groove of the fixed part is matched with the thread, standard tools are convenient to use for tightening the mounting pipe, and loosening caused by vibration under high pressure working condition is prevented.

[0011] The utility model further sets up: the mounting block has arc top and fixed straight part in the rod hole.

[0012] By adopting the technical scheme, the arc top of the mounting block is matched with the bottom of the rod hole to form a buffer, the fixed straight part is matched with the side wall of the rod hole to reduce stress concentration and prolong the service life of the component.

[0013] The utility model further sets up: the fixed sleeve has track part and limiting part, the limiting part is located at the end of the track part, the moving sleeve has parallel part and moving part, the parallel part is parallel to the track part, the moving part slides along the track part, and the limiting part is located on the moving track of the moving part.

[0014] By adopting the technical scheme, the track part of the fixed sleeve is matched with the moving part of the moving sleeve, the limiting part restricts the moving range, and the closed cavity is always in a sealed state when the valve disc operates. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the overall structural schematic view of the utility model;

[0016] Figure 2 It is the utility model Figure 1 The partial close-up view of A in the utility model;

[0017] Figure 3 Figure 2 is a schematic view of the installation pipe according to the present application;

[0018] Figure 4 Figure 3 is a schematic view of another perspective of the installation pipe according to the present application.

[0019] 1, valve body; 11, flow passage; 2, valve rod; 21, center hole; 3, valve flap; 31, center hole; 32, moving hole; 4, corrugated pipe; 5, valve seat; 6, installation pipe; 61, fixed part; 62, transition part; 63, installation part; 64, mounting hole; 65, fixed groove; 7, mounting block; 71, arc top; 72, fixed straight part; 8, mounting spring; 91, fixed sleeve; 911, limiting part; 912, track part; 92, moving sleeve; 921, moving part; 922, parallel part. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] As Figures 1-4The utility model discloses a corrugated pipe stop valve for ammonia, which comprises a valve body 1, a valve rod 2, a valve flap 3, a corrugated pipe 4 and a valve seat 5, a flow channel 11 is arranged in the valve body 1, the valve seat 5 is arranged in the flow channel 11, the valve rod 2 drives the valve flap 3 to move and cut off the flow channel 11 together with the valve seat 5, the corrugated pipe 4 is sleeved on the outer periphery of the valve rod 2, and the corrugated pipe 4 comprises a mounting pipe 6, a mounting block 7, a mounting spring 8, a fixed sleeve 91 and a moving sleeve 92.

[0023] The mounting pipe 6 comprises a fixed portion 61, a transition portion 62 and a mounting portion 63, the diameter of the fixed portion 61 is larger than that of the mounting portion 63, the transition portion 62 is located between the fixed portion 61 and the mounting portion 63, the mounting portion 63 is provided with a mounting hole 64 and extends to be communicated with the central hole 31, the mounting block 7 is located in the mounting hole 64, and the mounting spring 8 is arranged between the bottom of the mounting hole 64 and the mounting block 7.

[0024] The fixed portion 61 is provided with a fixed groove 65 in the form of a regular hexagon, and the outer periphery of the fixed portion 61 is provided with external threads.

[0025] The mounting block 7 has a circular arc top portion 71 and a fixed straight portion 72 located in the rod hole 21, the circular arc top portion 71 of the mounting block 7 is attached to the bottom of the rod hole 21 to form a buffer, and the fixed straight portion 72 is matched with the side wall of the rod hole 21, so that stress concentration is reduced and the service life of the component is prolonged.

[0026] The fixed sleeve 91 has a track portion 912 and a limiting portion 911, and the limiting portion 911 is located at the end of the track portion 912. The moving sleeve 92 has a parallel portion 922 and a moving portion 921, the parallel portion 922 is parallel to the track portion 912, the moving portion 921 slides along the track portion 912, and the limiting portion 911 is located on the moving track of the moving portion 921. The track portion 912 of the fixed sleeve 91 cooperates with the moving portion 921 of the moving sleeve 92, and the limiting portion 911 restricts the moving range to ensure that the sealing cavity 93 is always in a sealed state when the valve disc 3 operates.

[0027] Working process: The valve seat 5 is fixed in the flow channel 11 of the valve body 1, and the valve rod 2 is inserted into the center hole 31 of the valve disc 3 after passing through the corrugated pipe 4. By rotating the installation pipe 6 to engage the outer threads with the inner threads of the moving hole 32 of the valve disc 3, the installation block 7 is partially embedded in the rod hole 21 of the valve rod 2 to achieve locking under the action of the spring thrust. The fixed sleeve 91 is welded on the inner wall of the valve body 1, and the moving sleeve 92 is arranged on the side surface of the valve disc 3. When the valve rod 2 drives the valve disc 3 to move, the sliding portion of the moving sleeve 92 slides along the track of the fixed sleeve 91, and the limiting structure can prevent excessive displacement to ensure the sealing performance. When disassembling, the installation pipe 6 is rotated in the opposite direction, the spring is retracted to drive the installation block 7 to separate from the rod hole 21, and then the valve rod 2 and the valve disc 3 can be separated.

Claims

1. A corrugated pipe stop valve for ammonia, comprising a valve body (1), a valve stem (2), a valve flap (3), a corrugated pipe (4) and a valve seat (5), a flow channel (11) is arranged in the valve body (1), the valve seat (5) is arranged in the flow channel (11), the valve stem (2) drives the valve flap (3) to move and form a flow channel (11) block with the valve seat (5), the corrugated pipe (4) is sleeved on the outer periphery of the valve stem (2), characterized in that: The valve includes a mounting pipe (6), a mounting block (7), a mounting spring (8), a fixed sleeve (91) and a moving sleeve (92), the valve disc (3) is provided with a central hole (31) for the valve rod (2) to enter, the valve rod (2) is provided with a rod hole (21), the valve disc (3) is further provided with a moving hole (32) perpendicular to the central hole (31) and extending to communicate with the central hole (31), the mounting pipe (6) is threadedly connected in the moving hole (32), the mounting block (7) is slidably arranged in the mounting pipe (6), the mounting spring (8) is arranged in the mounting pipe (6) and drives the mounting block (7) to partially enter the rod hole (21) to form the fixation of the valve rod (2) and the valve disc (3), the fixed sleeve (91) is arranged in the valve body (1) and opposite to the valve rod (2), the moving sleeve (92) is arranged in the valve disc (3) and forms a sealed cavity (93) isolated from the flow passage (11) with the fixed sleeve (91), the valve rod (2) and the bellows (4) are located in the sealed cavity (93). ​ 2. An ammonia bellows stop valve according to claim 1, characterized in that: The mounting pipe (6) includes a fixed part (61), a transition part (62) and a mounting part (63), the diameter of the fixed part (61) is greater than that of the mounting part (63), the transition part (62) is located between the fixed part (61) and the mounting part (63), the mounting part (63) is provided with a mounting hole (64) extending to communicate with the central hole (31), and the mounting block (7) is located in the mounting hole (64).

3. An ammonia bellows stop valve according to claim 2, characterised in that: The fixed part (61) is provided with a fixed groove (65) in the form of a regular hexagon, and the outer periphery of the fixed part (61) is provided with external threads, and the mounting pipe (6) is provided with internal threads opposite to the internal threads.

4. An ammonia bellows stop valve according to claim 1, characterized in that: The mounting block (7) has a circular arc top (71) located in the rod hole (21) and a fixed straight part (72).

5. An ammonia bellows stop valve according to claim 1, characterized in that: The fixed sleeve (91) has a track part (912) and a limiting part (911), the limiting part (911) is located at the end of the track part (912), the moving sleeve (92) has a parallel part (922) and a moving part (921), the parallel part (922) is parallel to the track part (912), the moving part (921) slides along the track part (912), and the limiting part (911) is located on the movement track of the moving part (921).

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