An automatic cut-off device for ammonia vaporization

Abstract

The present invention discloses an automatic cut-off device for ammonia vaporization, which relates to the technical field of valves and includes a connecting pipe. A holding cylinder is fixedly connected to the bottom of the connecting pipe. A floating 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 that slides on the inner wall of the connecting pipe. A sealing ring is fixedly installed at the upper end of the mounting frame, and a sealing ring is arranged inside the connecting pipe. A first magnet is fixed on the side wall of the holding cylinder, and a second magnet is fixed at the lower opening end of the connecting pipe. A pressing rod that penetrates into the connecting pipe is elastically slidably arranged at the top of the connecting pipe. The pressing rod is coaxial with the top rod and is located above the top rod. In this automatic cut-off device for ammonia vaporization, by setting two magnets on the basis of a general float valve, the problem that the existing device has an unstable sealing effect due to small buoyancy caused by limited space can be effectively solved through the magnets. The two magnets ensure two stable states and improve the sealing effect during sealing.

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 Art

[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, it undergoes ammonia vaporization and ammonia purification in sequence, and finally 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. To prevent liquid ammonia from entering the ammonia purification equipment in the state of incomplete vaporization and to ensure the safety of the equipment, a float valve is provided at the outlet of the ammonia vaporization equipment during the process of converting liquid ammonia into ammonia by heating. When the liquid ammonia level rises, the valve is closed by the float, and when the liquid level does not rise (normal ammonia vaporization), the valve remains 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, resulting in 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 art.

[0005] To achieve the above object, the present invention provides the following technical solution: An automatic ammonia vaporization cut-off device, comprising a communicating pipe connected to the vaporization chamber and the inlet of the ammonia purification equipment. The bottom of the end of the communicating pipe extending into the vaporization chamber is fixedly connected with a holding cylinder. The bottom of the holding cylinder is communicated with the vaporization chamber. A floating cylinder sliding with the inner wall of the holding cylinder is arranged in the holding cylinder. The top of the floating cylinder is connected with a top rod. The upper end of the top rod is fixedly connected with a mounting frame sliding with the inner wall of the communicating pipe. The upper end of the mounting frame is fixedly installed with a sealing ring. And a sealing ring is arranged in the communicating pipe directly above the sealing ring. When the floating cylinder is subjected to buoyancy, the sealing ring rises and abuts against the sealing ring to seal. An air vent communicating with the vaporization chamber is arranged 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 under the gravitational attraction of the first magnet. When the floating cylinder is subjected to the buoyancy force of the rising liquid ammonia, it breaks away from the gravitational attraction 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 ends fixed to each other. 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 rod are fixed to each other. The elastic rods of the energy-absorbing member form an arc surface of a spindle-like 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 begins 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 ends of the fixing rods are fixed to the energy-absorbing members. 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 shape. A sealing sleeve is arranged between the mounting frame and the sealing ring. The sealing sleeve covers the fixing rods, the energy-absorbing members and the contact rods. And the cross-section of the sealing sleeve is conformable to the same energy-absorbing member and the fixing rods and the contact rods connected to the energy-absorbing member. During the upward movement of the mounting frame, before the sealing ring contacts the sealing ring, the contact rod contacts the inner top wall of the communicating pipe. 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 arranged 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 top rod and the top of the buoy are slidably arranged along the axial direction of the buoy.

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

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention sets two magnets on the basis of a general float valve, and can effectively solve the problem of unstable sealing effect caused by small buoyancy due to limited space in the existing device through the magnets. The two magnets ensure the stability of the two states and improve the sealing effect during sealing.

[0014] The present invention also provides an energy absorbing part on the valve body structure, which can effectively avoid the impact of the sealing ring and the sealing ring, thereby extending the service life of the sealing component. After contact, the energy absorbing part can be deformed to avoid generating a large reaction force, offset the pressure generated by the magnetic part, and buffer the impact without affecting the final sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of the ammonia treatment process equipment before the nitriding process;

[0016] Figure 2 It is a schematic diagram of the structure of the overall structure of the present invention located in a vaporizing device;

[0017] Figure 3 for Figure 2 Schematic diagram from another perspective;

[0018] Figure 4 It is a schematic diagram of the connecting pipe and the half-section structure of the valve body in the open state;

[0019] Figure 5 It is the overall half-section view in the closed state;

[0020] Figure 6 for Figure 5 A schematic diagram of the structure of the middle A area;

[0021] Figure 7 It is a schematic diagram of the half-section structure of the sealing ring, the sealing ring and the sealing sleeve in a closed state;

[0022] Figure 8 for Figure 7 A magnified schematic diagram of the structure of the middle B area;

[0023] Figure 9 Schematic diagram of the energy absorbing member and the resistance rod before and after deformation;

[0024] Figure 10 is a schematic diagram of an elastic rod;

[0025] Figure 11 Another perspective schematic diagram of the elastic rod.

[0026] 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 ring; 9 - vent hole; 10 - first magnet; 11 - second magnet; 12 - pressure rod; 13 - energy absorption member; 14 - elastic rod; 15 - fixed rod; 16 - abutting rod; 161 - bending part; 17 - sealing sleeve; 171 - groove; 18 - annular ring; 19 - heating pipe; 20 - liquid ammonia pipeline; 21 - temperature control chamber. Specific implementation manner

[0027] 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.

[0028] 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;

[0029] 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;

[0030] 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;

[0031] 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;

[0032] 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, the first magnet 10 is fixed on the holding cylinder 3, preferably on the outer sidewall of the holding cylinder 3, and the 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 pressure in the sealed state, thereby strengthening 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 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;

[0033] Specifically, when the liquid ammonia liquid level rises, the buoy 4 begins to be affected by the buoyancy force. However, due to the action of the first magnet 10, it will not rise immediately. As the buoyancy force increases, it begins to move upward, and at the same time moves away from the first magnet 10, reducing 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 the rise of the liquid level is the trigger condition when the magnets are set, the final sealing has both magnetic force and buoyancy force, and the sealing effect is more firm and stable.

[0034] Furthermore, both the first magnet 10 and the second magnet 11 use 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.

[0035] 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 fluctuations in the liquid ammonia liquid level on the valve.

[0036] Refer to Figure 7 , Figure 8 , Figure 9 and Figure 10, the magnet can improve the stability of the seal, but there are also certain defects. That is, during the rising process of the sealing ring 7, the closer the upper end of the floating cylinder 4 is to the second magnet 11, the greater the gravitational force it receives. Therefore, it shows an accelerating process, which causes the sealing ring 7 to quickly impact the sealing ring 8. In order to improve the sealing effect, the contact surface between the sealing ring 7 and the sealing ring 8 should not be too large (the pressure is limited). Then, during the impact process, it is easy to cause the sealing surface of the sealing ring 7 to crack. After multiple impacts, it may lead to seal damage and thus lose the sealing effect. Therefore, a buffer is provided between the mounting frame 6 and the connecting pipe 2. This buffer is discontinuous and a critical point is set. Before reaching the critical point, the reaction force continuously increases. After breaking through the critical point, the reaction force can be ignored to avoid the reaction force canceling out the gravitational force;

[0037] The energy-absorbing member 13 serves as the buffer, and it is like Figure 10 and Figure 11 shown, and is composed of two or more elastic rods 14. In the illustration, an embodiment with two is shown. Subsequently, the embodiment with two elastic rods 14 will be taken as an example for description. The two elastic rods 14 are recessed towards the same side ( Figure 10 at the rear side), and the two ends of the two elastic rods 14 are fixed to each other. In the natural state, the distance between the two elastic rods 14 from one end to the other end shows a trend of increasing first and then decreasing. That is, the two elastic rods 14 form an arc surface, and the front view state of this arc surface is spindle-like. This structure of the energy-absorbing member 13 enables it to have an increasing reaction force at the initial stage when deforming under force at both ends. After breaking through the critical state, the acting force drops suddenly. That is, as shown by the two thickened curves in A1 and A2 in Figure 9 . In A1, it is convex downward to the right before deformation, and in A2, it is convex upward to the left, bending in the opposite direction;

[0038] Specifically, one end of the energy-absorbing member 13 is fixed to 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 first contacts the inner top wall of the connecting pipe 2. Then, as shown in A1 in Figure 9 , the left end receives an upward thrust, and the right end receives the reaction force from the inner top wall of the connecting pipe 2. The two forces cause the energy-absorbing member 13 to bend (the actual effect is to correct and straighten). There are multiple groups of the energy-absorbing member 13, which can generate a large reaction force to offset part of the gravitational force 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 the critical state and bends in the opposite direction to the state of A2 in Figure 9 . At this time, the reaction force of the energy-absorbing member 13 on the mounting frame 6 can be small enough to be ignored, so that it will not affect the gravitational force of the first magnet 10 to exert the sealing pressure, thus 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 port of the connecting pipe 2 and then reset.

[0039] Furthermore, the elastic rod 14 is strip-shaped, i.e., a sheet body, and its deformation process is more directional, with higher uncertainty for rod-like objects.

[0040] Refer to Figure 7 、 Figure 8 and Figure 9 , based on the embodiment of the previous energy-absorbing member 13, a fixing rod 15 and a resisting rod 16 are provided. The fixing rods 15 are arranged in an array centered on the axis of the mounting frame 6 and fixed on the upper end surface or the circumferential outer side 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 framework. Multiple frameworks 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 in a parallel or approximately parallel state. The initial state is as shown in A1 in Figure 9 . The whole of the resisting rod 16 is slightly inclined. After the floating cylinder 4 rises, the bending portion 161 of the resisting rod 16 contacts the inner wall of the communication pipe 2. After the deformation of the energy-absorbing member 13, one end of the resisting rod 16 fits against the outer circumferential side wall of the sealing ring 8, and the other end receives the acting force of the energy-absorbing member 13, such as the pushing force to the upper left as shown in A2 in Figure 9 . The sealing sleeve 17 is cylindrical, and its cross-section conforms to that of the fixing rod 15, the energy-absorbing member 13, and the resisting rod 16. Finally, the side wall of the sealing sleeve 17 at the position of the resisting rod 16 fits against the outer wall of the sealing ring 8 to form a layer of seal, and the sealing sleeve 17 at the bending portion 161 forms another seal with the inner wall of the communication pipe 2, so as to achieve better sealing;

[0041] Moreover, the relative sliding generated by the fitting method 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.

[0042] Refer to Figure 8 . A groove 171 is provided on the outer wall of the sealing sleeve 17 at the bending 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, enable the sealing sleeve 17 to slide, and at the same time facilitate the rotation of the resisting rod 16 around the contact point between the annular ring 18 and the groove 171, that is, to make the sealing sleeve 17 fit against the outer wall of the sealing ring 8.

[0043] It should be noted that in this text, 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 order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such 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 elements inherent to such process, method, article or device.

[0044] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles 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), a sealing ring (7) is fixedly installed on the upper end of the mounting frame (6), 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 (8) for sealing, The side wall of the connecting tube (2) is provided with a vent hole (9) connected to the vaporization chamber (1). 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. The side wall of the retaining tube (3) is fixed with a first magnet (10). The lower open end of the connecting tube (2) is fixed with a second magnet (11). 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 upon by the buoyancy of the rising liquid ammonia, it is separated from the gravitational force of the first magnet (10) and is fixed by the attraction of the second magnet (11). A pressure relief member that penetrates into the connecting tube (2) is elastically slidably provided at the top of the connecting tube (2). The mounting frame (6) is provided with a plurality of energy absorbing members (13) arranged and distributed along the circumference of the outer peripheral side wall of the mounting frame (6). The energy absorbing member (13) is composed of at least two elastic rods (14) fixed at their head and tail ends. In a natural state, the spacing between the elastic rods (14) increases first and then decreases between the two ends, 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. The elastic rod (14) is deformed and reaches a critical value when the sealing ring (7) contacts the sealing ring (8) and deforms in the reverse direction. 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 the middle part of the contact rod (16) is provided with a bent portion (161) 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).

2. The ammonia vaporization automatic cut-off device according to claim 1, characterized in that: The cross section of the sealing sleeve (17) is shaped like the same 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 (8). 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) contacts the outer wall of the sealing ring (8), so that the sealing sleeve (17) and the sealing ring (8) form a seal.

3. The ammonia vaporization automatic cut-off device according to claim 2, 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).

4. 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.

5. 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).

6. The ammonia vaporization automatic cut-off device according to claim 1, characterized in that: The elastic rod (14) is a sheet-shaped body.

Images