Multi-stage sealing refrigeration valve with leakage alarm function

Abstract

The utility model discloses a multistage sealing refrigeration valve with a leakage alarm function, which belongs to the technical field of refrigeration valves and comprises a valve pipe, a valve core is arranged in the valve pipe, a valve is arranged on the surface of the valve core, a sealing pipe is fixedly communicated with the valve pipe, a valve rod is arranged in the sealing pipe, a first sealing component is arranged in the valve pipe, and a second sealing component is arranged in the valve pipe. By means of the arrangement of the second sealing assembly, when the valve is opened, the valve rod drives the armature to move upwards, the armature extrudes the second piston rod, the second piston rod drives the second piston to extrude air in the second cavity, the air in the second cavity is sealed, and the air in the second cavity is sealed. The air in the second cavity is squeezed into the second sealing ring through the second inflation pipe, the valve rod is squeezed through the second sealing ring, and therefore the situation that cold media influence all parts in the operation process of the refrigeration valve, and consequently cold shrinkage leakage is caused is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration valves, and more specifically to a multi-stage sealing refrigeration valve with leakage alarm. Background Art

[0002] Valves are pipe accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. Valves are control components in fluid conveying systems, with functions such as shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Valves used in fluid control systems, from the simplest shut-off valves to various valves used in extremely complex automatic control systems, have a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Refrigeration valves are a small flow, hard-sealed, normally closed electromagnet. Refrigeration valves can be used for defrosting, flow control and on-off control of refrigeration systems. At present, refrigeration valves have been widely used in refrigerators, air conditioning refrigeration units and dehumidifiers. The basic structure of a refrigeration valve consists of a coil and a movable iron core located in the coil. When the coil of the refrigeration valve is energized, a magnetic field is generated to drive the iron core, and the valve is opened by the movement of the iron core. The valve reset action is completed by utilizing the gravity of the valve core and the elastic force of the spring installed on its top.

[0003] Refrigeration valves are mainly used for defrosting, flow control and on-off control of refrigeration systems, which results in a large temperature difference between the internal working environment of the refrigeration valve and the external environment. As a result, the refrigeration valve is affected by the friction of the valve body movement and thermal expansion and contraction under long-term operation, resulting in friction gaps and shrinkage gaps in the sealing sleeve, valve stem, valve cover, etc., resulting in a decrease in the overall sealing performance and leakage, which affects the normal operation of the refrigeration system. Moreover, this leakage is small at the beginning and difficult to detect, which results in a waste of raw materials. When the valve core contacts the valve core base, sufficient pre-tightening force must be maintained. Therefore, the valve core and the valve core base are in an interference fit, which results in a large friction between the valve core and the valve core base when the valve core is opened and closed. Therefore, the valve core and the valve core base are very likely to cause serious wear during repeated use, which not only seriously shortens the service life of the refrigeration valve, but also easily causes valve core sealing problems after repeated use, resulting in leakage. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a multi-stage sealed refrigeration valve with leakage alarm. The utility model has the advantages of squeezing the sealing ring when opening the valve, stretching the sealing ring tightly, multi-stage sealing, and timely alarm for leakage, which solves the technical problems raised in the above background technology that thermal expansion and contraction lead to reduced sealing, leakage is difficult to detect, and leakage leads to waste of raw materials.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] A multi-stage sealed refrigeration valve with leakage alarm comprises: a valve tube, a valve core is arranged inside the valve tube, a valve is opened on the surface of the valve core, a sealing tube is fixedly connected to the valve tube, a valve stem is arranged inside the sealing tube, a first sealing assembly is arranged inside the valve tube, a second sealing plug is fixedly connected to the upper surface of the valve stem, an armature is arranged on the upper surface of the second sealing plug, the second sealing plug is matched with the sealing tube, a sealing box is arranged on the upper surface of the valve tube, an electromagnet is arranged inside the sealing box, a second sealing assembly is arranged inside the sealing box, a controller, a power supply battery and a speaker are respectively arranged inside the sealing box, an alarm light is arranged at the center of the upper surface of the sealing box, a heat dissipation hole is arranged on the surface of the sealing box, a third piston is arranged on the valve stem, and an air pressure sensor is arranged at the bottom of the third piston.

[0009] As a preferred solution of the utility model, mounting frames are provided at both ends of the valve tube, mounting holes are symmetrically provided on the mounting frames, the valve core is matched with the valve tube, positioning rods are symmetrically provided on the upper surface of the valve core, a positioning plate is slidably connected between the positioning rods, and the first sealing assembly is provided on the lower surface of the positioning plate.

[0010] As a preferred scheme of the utility model, the first sealing assembly includes a connecting plate, a sealing cylinder, a first inflation tube, a first piston rod, a first piston, a first cavity and a pressure plate. The connecting plate is arranged at the center position of the lower surface of the positioning plate, a sealing cylinder is arranged on the lower surface of the connecting plate, a first piston rod is slidably connected inside the sealing cylinder, a first piston is arranged on the upper surface of the first piston rod, a first cavity is arranged inside the sealing cylinder, a pressure plate is arranged on the lower surface of the first piston, and the first inflation tube is fixedly connected to the sealing cylinder.

[0011] As a preferred solution of the utility model, the first sealing assembly also includes a sealing ring, a first sealing plug, a first sealing ring and a first spring. A first sealing plug is provided on the lower surface of the pressure plate, the first sealing plug is matched with the valve, a sealing ring is provided on the lower surface of the pressure plate, a first sealing ring is provided on the surface of the first sealing plug, the first sealing ring is fixedly connected to the first inflation tube, the first inflation tube is symmetrically arranged on the sealing tube, and a first spring is arranged between the sealing tube and the pressure plate.

[0012] As a preferred solution of the utility model, the second sealing assembly includes a second sealing cylinder, a second piston rod, a second piston, a second cavity, a second inflation tube and a second sealing ring. The second sealing cylinder is arranged on the sealing box. A second cavity is arranged inside the second sealing cylinder. A second piston rod is slidably connected inside the second sealing cylinder. A second piston is arranged on the upper surface of the second piston rod. The second sealing ring is arranged inside the sealing tube. A second inflation tube is fixedly connected to the second sealing cylinder, and the second inflation tube is fixedly connected to the second sealing ring.

[0013] As a preferred solution of the utility model, the second sealing ring is matched with the valve stem, the second sealing ring is matched with the sealing tube, the second sealing tube is symmetrically arranged inside the sealing box, and one end of the second piston rod is arranged on the armature.

[0014] As a preferred solution of the utility model, a second spring is arranged between the valve tube and the armature, the second spring is matched with the sealing tube, the second spring is matched with the armature, the armature is matched with the electromagnet, and the electromagnet is electrically connected to the controller.

[0015] As a preferred solution of the utility model, the third piston is slidably connected to the inside of the sealing tube, and an air pressure sensor is symmetrically arranged on the lower surface of the third piston. The air pressure sensor is electrically connected to the controller, the power supply battery is electrically connected to the controller, and the third piston is matched with the air pressure sensor.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1) The utility model is provided with a second sealing component. When the valve is opened, the valve stem drives the armature to move upward, and the armature is used to squeeze the second piston rod. The second piston rod drives the second piston to squeeze the air in the second cavity. The air in the second cavity is squeezed into the second sealing ring through the second inflation tube, and the valve stem is squeezed by the second sealing ring, thereby avoiding the situation in which the cold medium affects the various components of the refrigeration valve during operation, causing cold shrinkage leakage.

[0019] 2) The utility model is provided with a sealing tube and a third piston. When the valve is opened, the third piston moves upward along the inner wall of the sealing tube, forming a negative pressure between the third piston and the second sealing ring. At this time, the air pressure in the sealing tube is detected by the air pressure sensor. When a leak occurs in the sealing tube, the liquid flows into the inside of the sealing tube through the second sealing ring. At this time, the air pressure sensor detects the change in air pressure and sends a signal to the controller. The controller controls the speaker and the alarm light to sound an alarm and flash, reminding people to replace the refrigeration valve in time.

[0020] 3) The utility model is provided with a first sealing component. When the valve is closed, the second spring pulls the armature to move downward, and the armature drives the positioning plate to move downward, thereby sealing the valve through the first sealing plug. The valve stem moves downward driven by the second spring, and the first spring is squeezed by the valve stem. The first piston rod drives the first piston to move upward, and the air in the first cavity is squeezed into the first sealing ring through the first piston. The valve is further sealed through the first sealing ring, thereby ensuring the sealing of the valve, reducing the friction between the valve and the first sealing plug, and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of a multi-stage sealed refrigeration valve with leakage alarm according to the utility model;

[0022] Figure 2 This is a three-dimensional diagram of a positioning rod of a multi-stage sealed refrigeration valve with a leakage alarm according to the utility model;

[0023] Figure 3 This is a three-dimensional diagram of the heat dissipation hole of a multi-stage sealed refrigeration valve with leakage alarm according to the utility model;

[0024] Figure 4 This is a three-dimensional diagram of the interior of a sealing box of a multi-stage sealed refrigeration valve with a leakage alarm according to the utility model;

[0025] Figure 5 It is a three-dimensional diagram of the armature of a multi-stage sealed refrigeration valve with leakage alarm according to the utility model;

[0026] Figure 6 This is a three-dimensional diagram of a first sealing component of a multi-stage sealing refrigeration valve with leakage alarm according to the utility model;

[0027] Figure 7 This is a cross-sectional view of a first sealing component of a multi-stage sealing refrigeration valve with a leakage alarm according to the utility model;

[0028] Figure 8 This is a three-dimensional diagram of a second sealing component of a multi-stage sealing refrigeration valve with leakage alarm according to the utility model;

[0029] Fig. 9The utility model is a cross-sectional view of the local structure of a multi-stage sealed refrigeration valve with leakage alarm.

[0030] Description of the numbers in the figure:

[0031] 1. Valve tube; 2. Mounting frame; 3. Mounting hole; 4. Sealing box; 5. Warning light; 6. Heat dissipation hole; 7. Controller; 8. Power supply battery; 9. Speaker; 10. Electromagnet; 11. Sealing tube; 12. Valve stem; 13. Positioning rod; 14. Positioning plate; 15. Valve core; 16. Valve; 17. First sealing assembly; 1701. Connecting plate; 1702. Sealing cylinder; 1703. First inflation tube; 1704. First piston rod; 1705. First piston; 1706. First cavity; 1707, pressure plate; 1708, sealing ring; 1709, first sealing plug; 1710, first sealing ring; 1711, first spring; 18, second sealing assembly; 1801, second sealing cylinder; 1802, second piston rod; 1803, second piston; 1804, second cavity; 1805, second inflation tube; 1806, second sealing ring; 19, third piston; 20, air pressure sensor; 21, armature; 22, second sealing plug; 23, second spring; 24, sealing groove. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Example:

[0036] See also Figure 1-9 A multi-stage sealed refrigeration valve with leakage alarm comprises: a valve tube 1, a valve core 15 is arranged inside the valve tube 1, a valve 16 is opened on the surface of the valve core 15, a sealing tube 11 is fixedly connected to the valve tube 1, a valve stem 12 is arranged inside the sealing tube 11, a first sealing component 17 is arranged inside the valve tube 1, a second sealing plug 22 is fixedly connected to the upper surface of the valve stem 12, an armature 21 is arranged on the upper surface of the second sealing plug 22, and the second sealing plug 22 is matched with the sealing tube 11, a sealing box 4 is arranged on the upper surface of the valve tube 1, an electromagnet 10 is arranged inside the sealing box 4, a second sealing component 18 is arranged inside the sealing box 4, a controller 7, a power supply battery 8 and a speaker 9 are arranged inside the sealing box 4, an alarm light 5 is arranged at the center of the upper surface of the sealing box 4, a heat dissipation hole 6 is arranged on the surface of the sealing box 4, a third piston 19 is arranged on the valve stem 12, and an air pressure sensor 20 is arranged at the bottom of the third piston 19. A sealing groove 24 matching the sealing ring 1708 is arranged on the valve core 15.

[0037] In a specific embodiment of the utility model, the valve tube 1 is installed to a desired position through the mounting frame 2 and the mounting hole 3. The valve 16 is sealed by the first sealing component 17 to ensure the sealing of the valve 16, and the sealing of the sealing tube 11 is ensured by the second sealing component 18 to prevent liquid leakage. The air pressure inside the sealing tube 11 is detected by the air pressure sensor 20, and the air tightness of the sealing tube 11 is detected by the air pressure sensor 20. When liquid leakage occurs, the air pressure in the sealing tube 11 changes, and the air pressure sensor 20 sends a signal to the controller 7. The controller 7 controls the speaker 9 to sound an alarm and controls the alarm light 5 to flash, reminding people to replace the refrigeration valve in time to reduce losses.

[0038] Specifically, mounting frames 2 are provided at both ends of the valve tube 1, mounting holes 3 are symmetrically provided on the mounting frames 2, the valve core 15 is matched with the valve tube 1, positioning rods 13 are symmetrically provided on the upper surface of the valve core 15, and positioning plates 14 are slidably connected between the positioning rods 13 and the positioning rods 13, and the first sealing assembly 17 is provided on the lower surface of the positioning plate 14.

[0039] In a specific embodiment of the present utility model, the valve tube 1 is fixed by the mounting frame 2 and the mounting hole 3, and the stability of the valve stem 12 during movement is ensured by the mutual cooperation between the valve stem 12 and the positioning rod 13.

[0040] Specifically, the first sealing assembly 17 includes a connecting plate 1701, a sealing cylinder 1702, a first inflation tube 1703, a first piston rod 1704, a first piston 1705, a first cavity 1706 and a pressure plate 1707. The connecting plate 1701 is arranged at a central position on the lower surface of the positioning plate 14, a sealing cylinder 1702 is arranged on the lower surface of the connecting plate 1701, the first piston rod 1704 is slidably connected inside the sealing cylinder 1702, the first piston 1705 is arranged on the upper surface of the first piston rod 1704, the first cavity 1706 is arranged inside the sealing cylinder 1702, a pressure plate 1707 is arranged on the lower surface of the first piston 1705, and the first inflation tube 1703 is fixedly connected to the sealing cylinder 1702.

[0041] In a specific embodiment of the utility model, after the electromagnet 10 is powered off, the valve stem 12 moves downward under the action of the second spring 23, and the connecting plate 1701 is squeezed by the valve stem 12, the connecting plate 1701 moves downward, and the first piston 1705 is driven upward by the first piston rod 1704, and the air in the first cavity 1706 is squeezed into the first sealing ring 1710, thereby increasing the sealing performance between the first sealing ring 1710 and the valve 16, and the valve stem 12 drives the first sealing plug 1709 to seal the valve 16.

[0042] Specifically, the first sealing assembly 17 also includes a sealing ring 1708, a first sealing plug 1709, a first sealing ring 1710 and a first spring 1711. The first sealing plug 1709 is arranged on the lower surface of the pressure plate 1707. The first sealing plug 1709 is matched with the valve 16. The sealing ring 1708 is arranged on the lower surface of the pressure plate 1707. The first sealing ring 1710 is arranged on the surface of the first sealing plug 1709. The first sealing ring 1710 is fixedly connected to the first inflation tube 1703. The first inflation tube 1703 is symmetrically arranged on the sealing tube 1702. A first spring 1711 is arranged between the sealing tube 1702 and the pressure plate 1707.

[0043] In a specific embodiment of the utility model, when the electromagnet 10 is energized, the valve stem 12 rises, and the pressure plate 1707 moves downward under the action of the first spring 1711, sucking the air in the first sealing ring 1710 into the first cavity 1706, thereby reducing the sealing between the first sealing ring 1710 and the valve 16, reducing friction, and increasing service life.

[0044] Specifically, the second sealing assembly 18 includes a second sealing cylinder 1801, a second piston rod 1802, a second piston 1803, a second cavity 1804, a second inflation tube 1805 and a second sealing ring 1806. The second sealing cylinder 1801 is arranged on the sealing box 4. The second cavity 1804 is arranged inside the second sealing cylinder 1801. The second piston rod 1802 is slidingly connected inside the second sealing cylinder 1801. The second piston 1803 is arranged on the upper surface of the second piston rod 1802. The second sealing ring 1806 is arranged inside the sealing tube 11. The second sealing cylinder 1801 is fixedly connected to the second inflation tube 1805, and the second inflation tube 1805 is fixedly connected to the second sealing ring 1806.

[0045] In a specific embodiment of the utility model, when the electromagnet 10 is energized, the armature 21 is sucked upward, and the armature 21 drives the second piston rod 1802 to move upward. The second piston rod 1802 drives the second piston 1803 to press the air in the second cavity 1804 into the second sealing ring 1806, thereby increasing the sealing between the second sealing ring 1806 and the third piston 19 to avoid leakage.

[0046] Specifically, the second sealing ring 1806 is matched with the valve stem 12 , the second sealing ring 1806 is matched with the sealing tube 11 , the second sealing cylinder 1801 is symmetrically arranged inside the sealing box 4 , and one end of the second piston rod 1802 is arranged on the armature 21 .

[0047] In a specific embodiment of the present utility model, the second sealing assembly 18 is protected by the sealing box 4 , and the heat dissipation holes 6 are used to dissipate heat for the electromagnet 10 .

[0048] Specifically, a second spring 23 is provided between the valve tube 1 and the armature 21 , the second spring 23 is matched with the sealing tube 11 , the second spring 23 is matched with the armature 21 , the armature 21 is matched with the electromagnet 10 , and the electromagnet 10 is electrically connected with the controller 7 .

[0049] In the specific embodiment of the utility model, the second spring 23 is used to provide downward force for the valve stem 12 to ensure the sealing of the valve tube 1 when the power is off. The second sealing plug 22 is used to further seal the sealing tube 11 to improve practicality.

[0050] Specifically, the third piston 19 is slidably connected to the inside of the sealing tube 11, and an air pressure sensor 20 is symmetrically arranged on the lower surface of the third piston 19. The air pressure sensor 20 is electrically connected to the controller 7, and the power supply battery 8 is electrically connected to the controller 7. The third piston 19 and the air pressure sensor 20 are matched.

[0051] In a specific embodiment of the utility model, the air pressure in the sealing tube 11 is detected by the air pressure sensor 20, leakage is detected according to the change of air pressure, the controller 7 is powered by the power supply battery 8, and an alarm is sounded through the speaker 9 and the alarm light 5 to remind people to replace it in time.

[0052] When the energized valve core is opened, the electromagnet 10 is energized to generate magnetic force to attract the armature 21, and the armature 21 drives the second piston rod 1802 to move upward, and the second piston rod 1802 drives the second piston 1803 to move upward, and the air in the second cavity 1804 is squeezed by the second piston 1803, and the air is squeezed into the second sealing ring 1806 to expand it, and the valve stem 12 is sealed by the second sealing ring 1806, and its expansion amount can gradually increase with the degree of opening of the valve stem 12. When the electromagnet 10 is powered off, the armature 21 moves downward under the action of the second spring 23, and the armature 21 drives the valve stem 12 to move downward, and the valve stem 12 drives the first sealing plug 1709 to seal the valve 16. When the valve stem 12 moves downward, the first spring 1711 is squeezed, and the connecting plate 1701 moves downward, driving the sealing cylinder 1702 to move downward. The air in the first cavity 1706 is squeezed into the first sealing ring 1710 under the action of the first piston 1705, so that the first sealing ring 1710 expands and seals the valve 16. Ensure the sealing performance. When the electromagnet 10 is turned on, the air in the first sealing ring 1710 is sucked into the first cavity 1706, and the first sealing ring 1710 shrinks, reducing the friction with the valve 16 and increasing the service life.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and improved concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A multi-stage sealed refrigeration valve with leakage alarm, characterized in that: include: A valve tube (1), wherein a valve core (15) is arranged inside the valve tube (1), a valve (16) is provided on the surface of the valve core (15), a sealing tube (11) is fixedly connected to the valve tube (1), a valve stem (12) is arranged inside the sealing tube (11), a first sealing component (17) is arranged inside the valve tube (1), a second sealing plug (22) is fixedly connected to the upper surface of the valve stem (12), an armature (21) is arranged on the upper surface of the second sealing plug (22), the second sealing plug (22) is matched with the sealing tube (11), a sealing box (4) is arranged on the upper surface of the valve tube (1), an electromagnet (10) is arranged inside the sealing box (4), a second sealing component (18) is arranged inside the sealing box (4), and the inner part of the sealing box (4) A controller (7), a power supply battery (8) and a speaker (9) are provided respectively; an alarm light (5) is provided at the center of the upper surface of the sealing box (4); a heat dissipation hole (6) is provided on the surface of the sealing box (4); a third piston (19) is provided on the valve stem (12); a pressure sensor (20) is provided at the bottom of the third piston (19); mounting frames (2) are provided at both ends of the valve tube (1); mounting holes (3) are symmetrically provided on the mounting frames (2); the valve core (15) is matched with the valve tube (1); positioning rods (13) are symmetrically provided on the upper surface of the valve core (15); a positioning plate (14) is slidably connected between the positioning rods (13) and the positioning rods (13); and the first sealing component (17) is provided on the lower surface of the positioning plate (14).

2. A multi-stage sealing refrigeration valve with leakage alarm according to claim 1, characterized in that: The first sealing assembly (17) includes a connecting plate (1701), a sealing cylinder (1702), a first inflation tube (1703), a first piston rod (1704), a first piston (1705), a first cavity (1706) and a pressure plate (1707). The connecting plate (1701) is arranged at a central position on the lower surface of the positioning plate (14). The lower surface of the connecting plate (1701) is provided with a sealing cylinder (1702). The sealing cylinder (1702) is slidably connected with the first piston rod (1704). The upper surface of the first piston rod (1704) is provided with a first piston (1705). The sealing cylinder (1702) is provided with a first cavity (1706). The lower surface of the first piston (1705) is provided with a pressure plate (1707). The sealing cylinder (1702) is fixedly connected with the first inflation tube (1703).

3. A multi-stage sealed refrigeration valve with leakage alarm according to claim 2, characterized in that: The first sealing assembly (17) also includes a sealing ring (1708), a first sealing plug (1709), a first sealing ring (1710) and a first spring (1711); a first sealing plug (1709) is arranged on the lower surface of the pressure plate (1707); the first sealing plug (1709) is matched with the valve (16); a sealing ring (1708) is arranged on the lower surface of the pressure plate (1707); a first sealing ring (1710) is arranged on the surface of the first sealing plug (1709); the first sealing ring (1710) is fixedly connected to the first inflation tube (1703); the first inflation tube (1703) is symmetrically arranged on the sealing tube (1702); and a first spring (1711) is arranged between the sealing tube (1702) and the pressure plate (1707).

4. The multi-stage sealing refrigeration valve with leakage alarm according to claim 1, characterized in that: The second sealing assembly (18) comprises a second sealing cylinder (1801), a second piston rod (1802), a second piston (1803), a second cavity (1804), a second inflation tube (1805) and a second sealing ring (1806). The second sealing cylinder (1801) is arranged on the sealing box (4). The second cavity (1804) is arranged inside the second sealing cylinder (1801). The second piston rod (1802) is slidably connected inside the second sealing cylinder (1801). The second piston (1803) is arranged on the upper surface of the second piston rod (1802). The second sealing ring (1806) is arranged inside the sealing tube (11). The second inflation tube (1805) is fixedly connected to the second sealing cylinder (1801). The second inflation tube (1805) is fixedly connected to the second sealing ring (1806).

5. A multi-stage sealed refrigeration valve with leakage alarm according to claim 4, characterized in that: The second sealing ring (1806) is matched with the valve stem (12), the second sealing ring (1806) is matched with the sealing tube (11), the second sealing cylinder (1801) is symmetrically arranged inside the sealing box (4), and one end of the second piston rod (1802) is arranged on the armature (21).

6. The multi-stage sealing refrigeration valve with leakage alarm according to claim 1, characterized in that: A second spring (23) is arranged between the valve tube (1) and the armature (21); the second spring (23) is matched with the sealing tube (11); the second spring (23) is matched with the armature (21); the armature (21) is matched with the electromagnet (10); and the electromagnet (10) is electrically connected to the controller (7).

7. The multi-stage sealing refrigeration valve with leakage alarm according to claim 1, characterized in that: The third piston (19) is slidably connected to the inside of the sealing tube (11); an air pressure sensor (20) is symmetrically arranged on the lower surface of the third piston (19); the air pressure sensor (20) is electrically connected to the controller (7); the power supply battery (8) is electrically connected to the controller (7); and the third piston (19) and the air pressure sensor (20) are matched.

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