Automatic cut-off device for ammonia vaporization

Abstract

The invention discloses an ammonia vaporization automatic cut-off device, and relates to the technical field of valves, the ammonia vaporization automatic cut-off device comprises a communicating pipe, the bottom of the communicating pipe is fixedly connected with a retaining cylinder, a floating cylinder is arranged in the retaining cylinder, the top of the floating cylinder is connected with an ejector rod, and the upper end of the ejector rod is fixedly connected with a mounting frame sliding relative to the inner wall of the communicating pipe; a sealing ring is fixedly mounted at the upper end of the mounting frame, a sealing ring is arranged in the communicating pipe, a first magnet is fixed to the side wall of the retaining cylinder, a second magnet is fixed to the lower opening end of the communicating pipe, a pressing rod penetrating into the communicating pipe is elastically and slidably arranged at the top of the communicating pipe, and the pressing rod is coaxial with the ejector rod and located above the ejector rod. According to the automatic cut-off device for ammonia vaporization, the two magnets are arranged on the basis of a common float valve, the problem that the sealing effect is unstable due to the fact that the space of an existing device is limited and buoyancy is small can be effectively solved through the magnets, the two magnets guarantee that the two states are stable, and the sealing effect during sealing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to an automatic cut-off device for ammonia vaporization. Background Technique

[0002] Ammonia nitriding (nitriding process) is a process for surface treatment of metal materials using ammonia. During the ammonia nitriding process, ammonia decomposes into nitrogen and hydrogen on the surface of the heated workpiece, and then nitrogen atoms diffuse into the material interior to form a nitrided layer.

[0003] Before the nitriding process treatment, the ammonia is vaporized from liquid ammonia. In the liquid ammonia container, ammonia vaporization and ammonia purification are carried out in sequence, and finally it enters the nitriding equipment. As Figure 1 shown, in the ammonia vaporization stage, the liquid ammonia exchanges heat through a heating medium to be vaporized. In order to prevent liquid ammonia from entering the ammonia purification equipment when the vaporization is not in place and to ensure the safety of the equipment, a float valve is set at the outlet of the ammonia vaporization equipment during the process of converting liquid ammonia into ammonia by heating. When the liquid ammonia rises, the valve is closed by the float, and when the liquid level does not rise (ammonia vaporization is normal), the valve is kept open to allow ammonia to enter the purification device. However, the force in the closed state of the existing float valve device mainly comes from the buoyancy generated by the float. In the case of a limited cavity, the buoyancy is small and at the same time the buoyancy is not stable enough, which will lead to a poor sealing effect. For this reason, we propose an automatic cut-off device for ammonia vaporization. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic cut-off device for ammonia vaporization to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solution: An automatic cut-off device for ammonia vaporization, comprising a communicating pipe connected to the vaporization chamber and the inlet of the ammonia purification equipment. One end of the communicating pipe extending into the vaporization chamber is fixedly connected to a holding cylinder at the bottom. The bottom of the holding cylinder communicates with the vaporization chamber. A floating cylinder sliding with the inner wall of the holding cylinder is arranged in the holding cylinder. A top rod is connected to the top of the floating cylinder. The upper end of the top rod is fixedly connected to a mounting frame sliding with the inner wall of the communicating pipe. A sealing ring is fixedly installed at the upper end of the mounting frame. And a sealing ring is arranged in the communicating pipe directly above the sealing ring. When the floating cylinder is buoyed, the sealing ring rises and abuts against the sealing ring for sealing. An air vent communicating with the vaporization chamber is provided on the side wall of the communicating pipe. When the sealing ring does not contact the sealing ring, the air vent and the sealing ring form an air outlet channel. A first magnet is fixed on the side wall of the holding cylinder. A second magnet is fixed at the lower opening end of the communicating pipe. In the natural state, the floating cylinder is kept stable by the gravitational force of the first magnet. When the floating cylinder is buoyed by the rising liquid ammonia, it breaks away from the gravitational force of the first magnet and is attracted and fixed by the second magnet. A pressure rod penetrating into the communicating pipe is elastically slidably arranged at the top of the communicating pipe. The pressure rod is coaxial with the top rod and is located above the top rod.

[0006] Preferably, a plurality of energy-absorbing members are arranged on the outer circumferential side wall of the mounting frame and are distributed in a circular array along the circumference. The energy-absorbing member is composed of at least two elastic rods with their heads and tails fixed. In the natural state, the distance between the elastic rods changes in a state of increasing first and then decreasing between the two ends, and the two ends of the elastic rods are fixed to each other. The elastic rods of the energy-absorbing member form an arc surface of a quasi-spindle shape. Before the sealing ring contacts the sealing ring, the upper end of the energy-absorbing member abuts against the inner wall of the communicating pipe and starts to bend to deform the elastic rod. When the sealing ring contacts the sealing ring, it reaches the critical point and deforms in the reverse direction.

[0007] Preferably, a plurality of fixing rods are arranged on the outer circumferential side wall of the mounting frame and are distributed in a circular array along the circumference. The upper end of the fixing rod is fixed to the energy-absorbing member. And a contact rod is fixedly connected to the upper end of the energy-absorbing member. A bending part is arranged in the middle of the contact rod, so that the two ends of the contact rod are in a quasi-parallel state. A sealing sleeve is arranged between the mounting frame and the sealing ring. The sealing sleeve covers the fixing rod, the energy-absorbing member and the contact rod. And the cross-section of the sealing sleeve conforms to the shape of the same energy-absorbing member and the fixing rod and the contact rod connected to the energy-absorbing member. During the upward movement of the mounting frame, the contact rod contacts the inner top wall of the communicating pipe before the sealing ring contacts the sealing ring. After contact, the contact rod and the fixing rod move relative to each other to deform the energy-absorbing member. And at the same time, the other end of the contact rod fits against the outer wall of the sealing ring, so that the sealing sleeve and the sealing ring form a seal.

[0008] Preferably, a groove is provided on the outer wall of the bending part of the contact rod of the sealing sleeve. And correspondingly, an annular ring adapted to the groove is arranged inside the communicating pipe.

[0009] Preferably, both the first magnet and the second magnet are strong magnets.

[0010] Preferably, the ejector rod is slidably arranged along the axial direction of the float on the top of the float.

[0011] Preferably, the elastic rod is a sheet body.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: Based on a general float valve, the present invention is provided with two magnets, which can effectively solve the problem that the existing device has a small buoyancy and an unstable sealing effect due to limited space. The two magnets ensure two stable states and improve the sealing effect during sealing. The present invention is also provided with an energy-absorbing member on the valve body structure. The energy-absorbing member can effectively avoid the impact on the sealing ring and the sealing washer, thereby prolonging the service life of the sealing components. After contact, the energy-absorbing member can also deform to avoid generating a large reaction force and offset the pressure on the magnetic member, buffering the impact without affecting the final sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall ammonia treatment process equipment before the nitriding process; Figure 2 It is a schematic diagram of the overall structure of the present invention in the vaporization device; Figure 3 It is Figure 2 Another perspective schematic diagram of; Figure 4 It is a schematic diagram of the half-section structure of the connecting pipe and the valve body in the open state; Figure 5 It is a half-sectional view of the whole in the closed state; Figure 6 It is Figure 5 An enlarged schematic diagram of the structure of area A in; Figure 7 It is a half-sectional view of the sealing ring, the sealing washer and the sealing sleeve in the closed state; Figure 8 It is Figure 7 An enlarged schematic diagram of the structure of area B in; Figure 9 It is a schematic diagram of the states of the energy-absorbing member and the abutting rod before and after deformation; Figure 10 It is a schematic diagram of the elastic rod; Figure 11 It is another perspective schematic diagram of the elastic rod.

[0014] In the figure: 1 - vaporization chamber; 2 - connecting pipe; 3 - holding cylinder; 4 - floating cylinder; 5 - ejector rod; 6 - mounting bracket; 7 - sealing ring; 8 - sealing collar; 9 - vent hole; 10 - first magnet; 11 - second magnet; 12 - pressing rod; 13 - energy - absorbing member; 14 - elastic rod; 15 - fixing rod; 16 - abutting rod; 161 - bending portion; 17 - sealing sleeve; 171 - groove; 18 - annular ring; 19 - heating pipe; 20 - liquid ammonia pipeline; 21 - temperature - control chamber. Detailed implementation manners

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figure 1 , the present invention provides a technical solution: an ammonia vaporization automatic cut - off device, including a connecting pipe 2, Figure 1 For the ammonia treatment steps before the existing nitriding process, liquid ammonia enters the ammonia vaporization device from the storage container through a pipeline, the gas after ammonia vaporization enters the ammonia purification device, and the purified ammonia enters the nitriding process equipment to participate in the nitriding process treatment; Refer to Figure 2 and Figure 3 , the ammonia vaporization device mainly consists of a temperature - control chamber 21, a heating pipe 19, a liquid ammonia pipeline 20 and a valve body. The temperature - control chamber 21 is a columnar cavity structure, the vaporization chamber 1 is arranged in the middle of the temperature - control chamber 21 and coaxially. The temperature - control chamber 21 is filled with a heating medium, preferably water. The heating pipe 19 is located at the bottom of the inner cavity of the temperature - control chamber 21 to heat the heating medium. One end of the liquid ammonia pipeline 20 is connected to the outlet pipeline of the liquid ammonia storage container, and the other end leads into the bottom of the vaporization chamber 1. The liquid ammonia vaporizes due to the rising temperature when entering the vaporization chamber 1; Refer to Figure 4 , Figure 5 , Figure 6 and Figure 7The connecting pipe 2 itself is composed of a plurality of parts assembled to facilitate installation and disassembly. The overall body is a stepped columnar body with an opening at the bottom and an opening in the outer circumferential direction. The two openings are connected, one opening is connected to the upper end of the retaining cylinder 3, and the other opening is connected to the ammonia purification device through a pipeline. The upper end of the vaporization chamber 1 is sealed and connected to the outer wall of the connecting pipe 2, and the retaining cylinder 3 and the connecting pipe 2 are included. The side wall of the connecting pipe 2 located in the retaining cylinder 3 is also provided with a plurality of vent holes 9. The float 4 is a closed cavity structure and can slide up and down on the inner wall of the retaining cylinder 3. A push rod 5 is connected to the top of the float 4. A mounting frame 6 is installed through the push rod 5, and the mounting frame 6 slides with the inner wall of the bottom opening of the connecting tube 2. The axis of the push rod 5 is colinear with the axis of the retaining tube 3. A sealing ring 8 is also fixedly installed inside the connecting tube 2. A sealing ring 7 is fixed on the upper end surface of the mounting frame 6. The sealing ring 7 contacts and seals with the sealing ring 8 to close the passage for the vent hole 9 to output ammonia gas outward through the connecting tube 2. A pressure rod 12 is also slidably provided on the connecting tube 2, which is coaxial with the push rod 5 and located directly above the axial direction of the push rod 5. The upper end of the pressure rod 12 is fixedly connected to a pressure block that is convenient for hand pressing. The pressure rod 12 and the connecting tube 2 are provided with an elastic reset member, preferably a spring; Specifically, after the liquid ammonia is heated and vaporized, in the normal vaporization state, the liquid level of the liquid ammonia in the vaporization chamber 1 remains stable, that is, the vaporization rate is stable. In this state, the sealing ring 7 is separated from the sealing ring 8 under the action of the gravity of the components, that is, the ammonia gas can be normally output to the outside. When the vaporization of the ammonia gas is abnormal, that is, the vaporization rate of the ammonia gas decreases, the liquid level of the liquid ammonia in the vaporization chamber 1 will rise. The rise of the liquid ammonia level will cause the float 4 to rise under the action of buoyancy. The rise of the float 4 will cause the sealing ring 7 to rise, and finally contact the lower end surface of the sealing ring 8 to seal, so that the ammonia gas is no longer discharged, and the liquid ammonia will not enter the ammonia purification device. After troubleshooting or repair, the liquid ammonia level is restored and the ammonia vaporization rate is normal. By pressing the pressure rod 12, the lower end of the pressure rod 12 pushes the push rod 5 downward, so that the float 4 is reset and the airway is opened; See also Figure 4 and Figure 5, under the buoyancy force of only the buoy 4, the sealing effect between the sealing ring 7 and the sealing collar 8 is poor and unstable. Therefore, a first magnet 10 is fixed on the holding cylinder 3, preferably on the outer sidewall of the holding cylinder 3, and a second magnet 11 is fixed at the lower end of the connecting pipe 2. The first magnet 10 is used to maintain a stable state when the buoy 4 is in a natural state (stable when not receiving buoyancy or receiving a small buoyancy), while the second magnet 11 is used to apply the pressure in the sealed state to strengthen the sealing effect. The horizontal height of the second magnet 11 in the axial direction of the push rod 5 is higher than that of the first magnet 10. The upper end of the buoy 4 is thickened and made of a material such as iron-cobalt-nickel that can be magnetically adsorbed, so that a greater gravitational force can be generated by the magnet here. The sidewall of the buoy 4 is made thinner or made of a material that cannot be magnetically adsorbed, so that after rising, the gravitational force of the first magnet 10 on the buoy 4 is smaller; Specifically, when the liquid ammonia liquid level rises, the buoy 4 begins to receive buoyancy, but due to the action of the first magnet 10, it will not rise yet. As the buoyancy increases, it begins to move upward, and at the same time moves away from the first magnet 10 to reduce its gravitational effect. As the buoy 4 rises, the gravitational effect of the second magnet 11 increases, and then it rises rapidly, causing the sealing ring 7 to fit against the sealing collar 8 for sealing. Because under the condition of setting the magnet, the rise of the liquid level is the trigger condition, and finally the sealing not only has the magnetic force but also the buoyancy, and the sealing effect is more firm and stable.

[0017] Furthermore, both the first magnet 10 and the second magnet 11 are strong magnets. Strong magnets are generally understood as neodymium iron boron magnets, whose magnetic energy product is much stronger than that of ordinary magnets, and a smaller volume can be used to generate the same gravitational effect.

[0018] Furthermore, the upper end of the buoy 4 is provided with a chute distributed axially, and the lower end of the push rod 5 can slide within a small range in the chute to avoid the influence of small-range fluctuations in the liquid ammonia liquid level on the valve.

[0019] Refer to Figure 7 , Figure 8 , Figure 9 and Figure 10 , the magnet can improve the sealing stability, but there are also certain defects. That is, during the rising process of the sealing ring 7, the closer the upper end of the buoy 4 is to the second magnet 11, the greater the gravitational force it receives, so it is in an accelerating process, which causes the sealing ring 7 to quickly impact the sealing collar 8. In order to improve the sealing effect, the contact surface between the sealing ring 7 and the sealing collar 8 should not be too large (the pressure is limited), so the impact process is likely to cause the sealing surface of the sealing ring 7 to crack, and after multiple impacts, the seal may be damaged and lose the sealing effect. Therefore, a buffer is provided between the mounting bracket 6 and the connecting pipe 2. This buffer is non-continuous, with a critical point set. Before reaching the critical point, the reaction force continuously increases, and after breaking through the critical point, the reaction force can be ignored to avoid the reaction force from canceling the gravitational force; The energy absorbing member 13 is a buffer. Figure 10 and Figure 11 As shown, it is composed of two or more elastic rods 14. The figure shows two embodiments. The following description is based on the embodiment of two elastic rods 14. The two elastic rods 14 are recessed to the same side ( Figure 10 The rear side of the two elastic rods 14 is fixed to each other at both ends. In the natural state, the distance between the two elastic rods 14 from one end to the other end increases first and then decreases, that is, the two elastic rods 14 form an arc surface, and the front view of the arc surface is spindle-like. The structure of the energy absorbing member 13 can make it deform under force at both ends. The reaction force in the initial stage increases, and after reaching the critical state, the force drops sharply, that is, Figure 9 As shown by the two bold curves in A1 and A2, A1 is before deformation, convex to the lower right, while A2 is convex to the upper left, bending in the opposite direction; Specifically, one end of the energy absorbing member 13 is fixed on the mounting frame 6. When the mounting frame 6 moves upward, before the sealing ring 7 contacts the sealing ring 8, the energy absorbing member 13 contacts the inner top wall of the connecting pipe 2 first. Figure 9 As shown in A1, the left end receives an upward thrust, while the right end receives a reaction force from the inner top wall of the connecting pipe 2, and the two make the energy absorbing member 13 bend (the actual effect is to correct and straighten it). The energy absorbing member 13 is provided with multiple groups, which can generate a large reaction force to offset part of the attraction of the second magnet 11, thereby buffering the impact of the sealing ring 7 on the sealing ring 8. After the sealing ring 7 contacts the sealing ring 8 and before reaching the final sealing state, the energy absorbing member 13 reaches a critical state and bends in the reverse direction. Figure 9 In the state A2 in the figure, the reaction force of the energy absorbing member 13 on the mounting frame 6 can be so small as to be ignored, so as not to affect the gravitational force of the first magnet 10 applied as sealing pressure, thereby not affecting the sealing effect. After opening, due to the downward movement of the mounting frame 6, the upper end of the energy absorbing member 13 will touch the inner wall at the lower end of the connecting pipe 2 and then reset.

[0020] Furthermore, the elastic rod 14 is in a strip shape, that is, a sheet-like body, and its deformation process is more directional, and the rod type uncertainty is higher.

[0021] See also Figure 7 , Figure 8 and Figure 9 On the basis of the embodiment of the energy absorbing member 13, a fixing rod 15 and a resisting rod 16 are provided. The fixing rod 15 is arranged in an array with the axis of the mounting frame 6 as the center and fixed to the upper end surface or the circumferential outer wall of the mounting frame 6. The two ends of the energy absorbing member 13 are respectively connected to the fixing rod 15 and the resisting rod 16 to form a skeleton. The multiple skeletons support the sealing sleeve 17. A bending portion 161 is provided in the middle of the resisting rod 16. The bending portion 161 makes the two ends of the resisting rod 16 face the same direction, that is, the two ends are parallel or approximately parallel. The initial state is as followsFigure 9 As shown by A1 in [reference], the whole of the contact rod 16 is slightly inclined. After the buoy 4 rises, the bent portion 161 of the contact rod 16 contacts the inner wall of the communication pipe 2. After that, after the energy absorption member 13 is deformed, one end of the contact rod 16 fits against the outer peripheral side wall of the sealing ring 8, and the other end receives the acting force of the energy absorption member 13, such as Figure 9 the left-upward thrust shown by A2 in [reference]. The sealing sleeve 17 is in a tubular shape, and its cross-section conforms to the fixed rod 15, the energy absorption member 13 and the contact rod 16. Finally, the side wall of the sealing sleeve 17 located at the contact rod 16 fits against the outer wall of the sealing ring 8 to form a layer of seal, and the sealing sleeve 17 located at the bent portion 161 forms another seal with the inner wall of the communication pipe 2, so as to achieve better sealing; moreover, the relative sliding generated by the fitting manner of the above-mentioned sealing sleeve 17 is small, and the wear on the surface of the sealing sleeve 17 is also small, which can effectively extend the service life.

[0022] Refer to Figure 8 , a groove 171 is formed on the outer wall of the sealing sleeve 17 at the bent portion 161. The groove 171 is annular and centered on the axis of the sealing ring 8, and its cross-section is arc-shaped. Correspondingly, an annular ring 18 is fixed on the inner top wall of the communication pipe 2. The cross-section of the annular ring 18 is semi-circular. The functions of the annular ring 18 and the groove 171 are to perform positioning, enabling the sealing sleeve 17 to slide, and at the same time facilitating the rotation of the contact rod 16 around the contact point of the annular ring 18 and the groove 171, that is, making the sealing sleeve 17 fit against the outer wall of the sealing ring 8.

[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0024] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ammonia vaporization automatic shut-off device, comprising a connecting pipe (2) connected to a vaporization chamber (1) and an inlet of an ammonia purification device, characterized in that: The bottom of one end of the connecting tube (2) extending into the vaporization chamber (1) is fixedly connected to a retaining cylinder (3), the bottom of the retaining cylinder (3) is in communication with the vaporization chamber (1), a float (4) is provided in the retaining cylinder (3) and slides with the inner wall of the retaining cylinder (3), the top of the float (4) is connected to a push rod (5), the upper end of the push rod (5) is fixedly connected to a mounting frame (6) that slides with the inner wall of the connecting tube (2), the upper end of the mounting frame (6) is fixedly installed with a sealing ring (7), and a sealing ring (8) is provided inside the connecting tube (2) and located directly above the sealing ring (7), the sealing ring (7) rises when the float (4) is subjected to buoyancy and contacts the sealing ring (7) for sealing, and a sealing ring (8) is provided on the side wall of the connecting tube (2) and is in communication with the vaporization chamber (1) is connected to the vent hole (9), when the sealing ring (7) is not in contact with the sealing ring (8), the vent hole (9) and the sealing ring (8) form an air outlet channel, a first magnet (10) is fixed to the side wall of the retaining cylinder (3), and a second magnet (11) is fixed to the lower open end of the connecting tube (2). In a natural state, the float (4) is kept stable by the gravitational force of the first magnet (10). When the float (4) is acted on by the buoyancy of the rising liquid ammonia, it is separated from the gravitational force of the first magnet (10) and is attracted and fixed by the second magnet (11). A pressure rod (12) is elastically slidably provided at the top of the connecting tube (2) and penetrates into the connecting tube (2). The pressure rod (12) is coaxial with the top rod (5) and is located above the top rod (5).

2. The ammonia vaporization automatic cut-off device according to claim 1, characterized in that: The outer peripheral side wall of the mounting frame (6) is provided with a plurality of energy absorbing members (13) arranged and distributed along the circumference. The energy absorbing member (13) is composed of at least two elastic rods (14) whose end ends are fixed to each other. In a natural state, the spacing between the elastic rods (14) changes between the two ends in a state of first increasing and then decreasing, and the two ends of the elastic rods (14) are fixed to each other. The elastic rods (14) of the energy absorbing member (13) form a spindle-like arc surface. Before the sealing ring (7) contacts the sealing ring (8), the upper end of the energy absorbing member (13) contacts the inner wall of the connecting pipe (2) and begins to bend to deform the elastic rods (14). When the sealing ring (7) contacts the sealing ring (8), the critical point is reached and the elastic rods (14) are deformed in the reverse direction.

3. The ammonia vaporization automatic cut-off device according to claim 2, characterized in that: The outer peripheral side wall of the mounting frame (6) is provided with a plurality of fixing rods (15) arranged and distributed along the circumference, and the upper end of the fixing rod (15) is fixed to the energy absorbing member (13), and the upper end of the energy absorbing member (13) is fixedly connected to the contact rod (16), and a bent portion (161) is provided in the middle of the contact rod (16) so that the two ends of the contact rod (16) are parallel to each other. A sealing sleeve (17) is provided between the mounting frame (6) and the sealing ring (8), and the sealing sleeve (17) covers the fixing rod (15), the energy absorbing member (13) and the contact rod (16), and is sealed. The cross section of the sealing sleeve (17) is shaped in the same manner as the energy absorbing member (13) and the fixing rod (15) and the abutment rod (16) connected to the energy absorbing member (13). When the mounting frame (6) moves upward, the abutment rod (16) contacts the inner top wall of the connecting pipe (2) before the sealing ring (7) contacts the sealing ring (7). After the contact, the abutment rod (16) and the fixing rod (15) move relative to each other to deform the energy absorbing member (13). At the same time, the other end of the abutment rod (16) is in contact with the outer wall of the sealing ring (8), so that the sealing sleeve (17) and the sealing ring (8) form a seal.

4. The ammonia vaporization automatic cut-off device according to claim 3, characterized in that: The outer wall of the sealing sleeve (17) at the bent portion (161) of the abutting rod (16) is provided with a groove (171), and correspondingly, an annular ring (18) matching the groove (171) is provided inside the connecting pipe (2).

5. The ammonia vaporization automatic cut-off device according to claim 1, characterized in that: The first magnet (10) and the second magnet (11) are both strong magnets.

6. The ammonia vaporization automatic cut-off device according to claim 1, characterized in that: The top rod (5) and the top of the buoy (4) are slidably arranged along the axial direction of the buoy (4).

7. The ammonia vaporization automatic cut-off device according to claim 2, characterized in that: The elastic rod (14) is a sheet-shaped body.

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