A carbon dioxide solenoid valve with self-compensating double-stage sealing

Abstract

The present invention relates to the technical field of solenoid valve sealing, and specifically relates to a carbon dioxide solenoid valve with a self-compensating dual-stage seal, which includes a valve body and an electromagnetic controller. A valve seat is provided in the valve body. A valve port and a valve core are provided on the valve seat. The electromagnetic controller has a compression spring for resetting the valve core downward. A double-layer seal structure is provided on the valve core. The valve seat has a step for cooperating with the double-layer seal structure. The double-layer seal structure is provided with a rubber seal and a metal seal. The step has a first contact surface capable of contacting the rubber seal and a second contact surface capable of contacting the metal seal. The first contact surface has an annular groove for the rubber seal to be embedded therein. Through the contact of the rubber seal and the metal seal with the first contact surface and the second contact surface, the present invention forms a stable primary seal and secondary seal, and at the same time realizes pressure self-compensation by using the annular groove for the rubber seal to be embedded.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valve sealing, and specifically relates to a carbon dioxide solenoid valve with self-compensating double-stage sealing. Background Art

[0002] The carbon dioxide solenoid valve is used to control the flow of carbon dioxide gas. Traditional carbon dioxide solenoid valves usually use metal-to-metal or rubber seals to achieve the closing function. However, in the prior art, seal failure is likely to occur under high pressure or low temperature environments, resulting in gas leakage, which in turn affects the stability and reliability of the solenoid valve.

[0003] Currently, a solenoid valve with high sealing performance disclosed in a Chinese invention patent application (publication number CN117759761A) has a structure including a valve body. A valve seat mechanism is provided on the valve body. A control mechanism is provided inside the valve body. A sealing mechanism is jointly provided on the valve seat mechanism and the control mechanism. A positioning mechanism is provided on the valve seat mechanism. A filtering mechanism is provided on the valve seat mechanism. An electrical connection wire is connected to the valve body. The valve seat mechanism includes a valve seat main body. The valve seat main body is provided at the bottom of the valve body. A partition is fixedly connected inside the valve seat main body. A connecting block is fixedly connected to the bottom of the valve body. A first mounting plate is fixedly connected to the connecting block. A second mounting plate is mounted on the first mounting plate. The second mounting plate is fixedly connected to the valve seat main body. The control mechanism includes coil turns. The coil turns are fixedly connected inside the valve body. A fixed iron core is fixedly connected inside the valve body. A first spring is fixedly connected to the fixed iron core. A moving iron core is fixedly connected to the first spring. The moving iron core is arranged inside the coil turns. A valve core is fixedly connected to the moving iron core. The cross-section of the moving iron core is rectangular, and the bottom cross-section of the valve core is triangular. The sealing mechanism includes a resisting rod. The resisting rod is fixedly connected to the moving iron core. A connecting rod is slidably connected to the partition. A pushing block is fixedly connected to the connecting rod. The pushing block is slidably connected inside the partition. A corrosion-resistant air cushion is fixedly connected to the partition. A through pipe is fixedly connected to the corrosion-resistant air cushion. The through pipe communicates with the inner cavity where the pushing block is located. A second spring is wound around the connecting rod. One end of the second spring is fixedly connected to the connecting rod, and the other end is fixedly connected to the inside of the partition.

[0004] The solenoid valve disclosed in the above prior art inflates the inside of the corrosion-resistant air cushion through a through pipe, causing the corrosion-resistant air cushion to expand and fit onto the valve core. This facilitates further air cushion sealing at the valve port when closing the valve, improving the sealing performance at the valve port. However, when pressure and temperature change, the gas volume inside the air cushion may change accordingly. High pressure may cause the air cushion to be overly compressed, reducing the sealing efficiency, while low pressure or a drop in temperature may cause the gas inside the air cushion to contract, resulting in incomplete sealing. Therefore, there is a current need for a carbon dioxide solenoid valve with a double-layer sealing structure and a self-compensation function, which can not only provide high reliability during sealing but also adapt to changes in external conditions to ensure stable sealing performance in different working environments. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, a carbon dioxide solenoid valve with self-compensating double-stage sealing is provided. The carbon dioxide solenoid valve forms a stable primary seal and secondary seal by a rubber seal and a metal seal contacting the first contact surface and the second contact surface on the valve seat respectively, providing additional safety protection against pressure or temperature changes.

[0006] To solve the problems of the prior art, the present invention provides a carbon dioxide solenoid valve with self-compensating double-stage sealing, including a valve body. A valve seat is provided in the valve body. A valve port and a valve core that can be inserted into the valve port are provided on the valve seat. A channel for the valve core to move along the axis direction of the valve port is opened on the valve body. A double-layer sealing structure is provided on the valve core. The valve seat has a step that cooperates with the double-layer sealing structure to close the valve port. In the state where the double-layer sealing structure contacts the step, a primary seal and a secondary seal are sequentially formed from bottom to top between the two. An electromagnetic controller for controlling the valve core to move upward away from the valve port is provided on the valve body. The electromagnetic controller has a compression spring for resetting the valve core downward.

[0007] Preferably, the double-layer sealing structure is provided with a rubber seal and a metal seal in sequence from the lower end of the valve core upward. The step has a first contact surface that can contact the rubber seal and a second contact surface that can contact the metal seal.

[0008] Preferably, the rubber seal is specifically a rubber ring coaxially sleeved on the valve core. When the rubber ring presses against the first contact surface, the rubber ring is in a compressed state, and at this time, the primary seal is formed between the rubber ring and the first contact surface.

[0009] Preferably, the metal seal is specifically a metal ring coaxially sleeved on the valve core. The lower end of the metal ring and the second contact surface are both conical surface structures that cooperate with each other. When the metal ring presses against the second contact surface, the two conical surfaces are in a fitting state, and at this time, the secondary seal is formed between the metal ring and the second contact surface.

[0010] Preferably, the first contact surface has an annular groove into which a rubber ring can be embedded. When the pressure inside the valve body is greater than a preset value, the rubber ring compressed in the annular groove is in a self-compensating state of maintaining sealed contact with the first contact surface.

[0011] Preferably, a rubber layer is provided on the first contact surface and is in contact with it. When the rubber ring is pressed into the annular groove, the rubber layer is extruded by the rubber ring and is in a deformed state of being passively embedded in the annular groove, so that the rubber ring is wrapped in the rubber layer.

[0012] Preferably, the metal ring can move axially along the valve core. A upper valve sleeve is provided on the valve core, and a first corrugated spring is connected between the upper valve sleeve and the metal ring. When the metal ring presses against the second contact surface, the first corrugated spring is compressed, so that the metal ring and the second contact surface are in a self-compensating state of maintaining sealed contact.

[0013] Preferably, a lower valve sleeve is further provided on the valve core, and a second corrugated spring is connected between the lower valve sleeve and the metal ring. When the metal ring presses against the second contact surface, the second corrugated spring is stretched, so that the self-compensating state between the metal ring and the second contact surface is enhanced.

[0014] Preferably, a first magnetic sticker is provided on the lower surface of the upper valve sleeve, and a second magnetic sticker is provided below the first magnetic sticker and is installed in the channel of the valve body. When the valve port is closed, the first magnetic sticker and the second magnetic sticker come into contact, forming a magnetic contact surface that maintains double-layer sealing structure and is in close contact with the step.

[0015] Preferably, the lower end of the channel of the valve body has an inwardly extending slope surface, and the metal ring has a flange that can contact the slope surface. When the valve port is closed, the flange fits with the slope surface, forming a sealing contact surface that prevents gas from flowing back and pushing up the metal ring to cause the valve core to rise and open the valve port.

[0016] The beneficial effects of this application compared with the prior art are as follows:

[0017] 1. By using a rubber seal and a metal seal to contact the first contact surface and the second contact surface on the valve seat respectively, a stable primary and secondary seal is formed in the present invention, thus synchronously forming a double-layer seal, providing additional safety protection against pressure or temperature changes.

[0018] In the sealed state, the rubber seal can ensure the effectiveness of the primary seal in micro-irregularities or gaps due to elastic deformation, while the metal seal provides a firm secondary seal with its high hardness and wear resistance. The overall sealing performance can be maintained even under pressure or temperature changes, preventing gas leakage.

[0019] 2. The present invention embeds the rubber ring into the annular groove on the first contact surface, achieving a self-compensating sealing effect for pressure changes. Under the condition of pressure change in the valve body, the rubber ring relies on the support and restriction provided by the annular groove to automatically adjust its shape to maintain close contact with the first contact surface, effectively preventing gas leakage.

[0020] At the same time, after the rubber layer is extruded into the annular groove, it wraps the rubber ring, further enhancing the sealing performance. Even if the rubber ring becomes loose after long-term use, the combination of the annular groove and the rubber layer can still restrict its position to ensure that the sealing function remains undiminished.

[0021] 3. The present invention provides a pre-tightening force for the metal ring through the first wave spring and the second wave spring and allows elastic compensation, ensuring stable sealing and adaptability to manufacturing tolerances, installation errors, and fluctuations during operation.

[0022] In the sealed state, the first wave spring is compressed when the metal ring presses against the second contact surface. At the same time, the stretching of the second wave spring provides an additional reverse force for the metal ring, enhancing the contact pressure. This enhances the self-compensating ability in the face of temperature and pressure fluctuations and ensures airtightness.

[0023] 4. The present invention enhances the overall stability of the valve core and the valve seat through the magnetic contact between the first magnetic patch and the second magnetic patch, and provides an additional holding force for the double-layer sealing structure to ensure the tight fit of the rubber seal and the metal seal with the corresponding contact surfaces.

[0024] At the same time, the flange on the metal ring fits with the slope surface to form a sealing interface, effectively blocking gas backflow and preventing the accidental opening of the valve core due to backflow pressure, thereby enhancing the one-way flow characteristic and overall airtightness of the valve body. Description of the Drawings

[0025] Figure 1 is a three-dimensional structural schematic diagram of a carbon dioxide solenoid valve with a self-compensating dual-stage seal according to the present invention.

[0026] Figure 2 is a planar cross-sectional view of a carbon dioxide solenoid valve with a self-compensating dual-stage seal according to the present invention.

[0027] Figure 3 is a three-dimensional structural cross-sectional view of a carbon dioxide solenoid valve with a self-compensating dual-stage seal according to the present invention.

[0028] Figure 4 is a planar state schematic diagram of the valve port closed of a carbon dioxide solenoid valve with a self-compensating dual-stage seal according to the present invention.

[0029] Figure 5It is a schematic plan view of the valve port opening of a carbon dioxide solenoid valve with a self-compensating double-stage seal according to the present invention.

[0030] Figure 6 It is a schematic three-dimensional view of the valve port closing of a carbon dioxide solenoid valve with a self-compensating double-stage seal according to the present invention.

[0031] Figure 7 It is a schematic three-dimensional view of the valve port opening of a carbon dioxide solenoid valve with a self-compensating double-stage seal according to the present invention.

[0032] Figure 8 It is of the present invention Figure 6 An enlarged view of part A.

[0033] Figure 9 It is of the present invention Figure 6 An enlarged view of part B.

[0034] Figure 10 It is of the present invention Figure 6 An enlarged view of part C.

[0035] Figure 11 It is of the present invention Figure 6 An enlarged view of part D.

[0036] In the figure, the reference numerals are: 1, valve body; 11, channel; 111, first magnetic tile; 112, second magnetic tile; 12, electromagnetic controller; 121, moving iron core; 122, fixed iron core; 123, coil; 13, compression spring; 2, valve seat; 21, step; 211, first contact surface; 2111, annular groove; 2112, rubber layer; 212, second contact surface; 22, valve port; 3, valve core; 31, upper valve sleeve; 311, first corrugated spring; 32, lower valve sleeve; 321, second corrugated spring; 4, rubber seal; 5, metal seal; 51, flange. Detailed implementation manners

[0037] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0038] Refer to Figures 1 - 7As shown in the figure, a carbon dioxide solenoid valve with a self-compensating double-stage seal includes a valve body 1. A valve seat 2 is provided in the valve body 1. A valve port 22 and a valve core 3 that can be inserted into the valve port 22 are provided on the valve seat 2. A channel 11 for the valve core 3 to move along the axis direction of the valve port 22 is opened on the valve body 1. A double-layer seal structure is provided on the valve core 3. The valve seat 2 has a step 21 that cooperates with the double-layer seal structure and is used to close the valve port 22. In the state where the double-layer seal structure is in contact with the step 21, a primary seal and a secondary seal are sequentially formed from bottom to top between the two. An electromagnetic controller 12 for controlling the valve core 3 to move upward away from the valve port 22 is provided on the valve body 1. The electromagnetic controller 12 has a compression spring 13 for resetting the valve core 3 downward.

[0039] The electromagnetic controller 12 has a moving iron core 121 integrated with the valve core 3 and a stationary iron core 122 provided above the moving iron core 121. The compression spring 13 is provided between the moving iron core 121 and the stationary iron core 122.

[0040] The electromagnetic controller 12 also has a coil 123 surrounding the stationary iron core 122.

[0041] When current passes through the coil 123, a magnetic field is generated, acting between the moving iron core 121 and the stationary iron core 122, generating an attractive force. The electromagnetic force can overcome the resistance of the compression spring 13, causing the moving iron core 121 to move upward, thereby driving the valve core 3 away from the valve port 22 position and allowing gas to flow. Conversely, the compression spring 13 will push the moving iron core 121 back to its original position to close the valve port 22.

[0042] In the normal working state, due to the action of the compression spring 13, the valve core 3 is tightly pressed against the valve seat 2. At this time, the primary seal and the secondary seal in the double-layer seal structure are in close contact with the step 21 on the valve seat 2 respectively, ensuring that the valve port 22 is in a completely closed state and effectively preventing gas leakage.

[0043] However, when the internal pressure or temperature of the valve body 1 changes, even if the primary seal undergoes a slight displacement or deformation and cannot maintain the best sealing state. The secondary seal can still play a role and continue to effectively block the gas from passing through, maintaining the overall sealing performance unaffected.

[0044] See Figures 2 - 9 As shown in the figure, the double-layer seal structure is provided with a rubber seal 4 and a metal seal 5 in sequence from the lower end of the valve core 3 upward. The step 21 has a first contact surface 211 that can contact the rubber seal 4 and a second contact surface 212 that can contact the metal seal 5.

[0045] When the elastic force of the compression spring 13 pushes the moving iron core 121 downward, it drives the valve core 3 connected thereto to closely fit on the valve seat 2. At this time, the rubber seal 4 and the metal seal 5 in the double-layer sealing structure are respectively in contact with the first contact surface 211 and the second contact surface 212 on the valve seat 2, forming a primary seal and a secondary seal.

[0046] Specifically, the rubber seal 4 at the lower end of the double-layer sealing structure is in contact with the first contact surface 211 on the valve seat 2, and the contact point constitutes the primary seal. The rubber seal 4 provides good elastic deformation ability. Even in the face of slight surface unevenness or slight pressure changes, it can effectively fill any tiny gaps to ensure airtightness.

[0047] At the same time, the metal seal 5 disposed above the rubber seal 4 in close proximity is in contact with the second contact surface 212 on the valve seat 2, forming a more robust secondary seal. The contact between the metal seal 5 and the second contact surface 212 depends on the frictional force generated by physical contact. Under the double seal, it is ensured that even when the performance of the rubber seal 4 decreases due to aging or pressure and temperature changes, the metal seal 5 can still function independently to maintain the sealing performance of the valve port 22.

[0048] See Figures 2 - 8 As shown, the rubber seal 4 is specifically a rubber ring coaxially sleeved on the valve core 3. When the rubber ring presses against the first contact surface 211, the rubber ring is in a compressed state, and at this time, the primary seal is formed between the rubber ring and the first contact surface 211.

[0049] When the valve core 3 moves downward under the action of the compression spring 13, the rubber ring is pressed towards the first contact surface 211 of the valve seat 2. At this time, the rubber ring is in a compressed state. The compression not only causes the rubber material to undergo elastic deformation but also can fill any tiny irregularities or gaps existing between the first contact surface 211 and the rubber ring, ensuring the primary sealing effect between the two.

[0050] In the compressed state, the rubber ring expands and extends to a certain extent around the compression point, forming a uniform pressure distribution layer on the contact surface. As the pressure increases, the rubber ring begins to adaptively deform along the contour of the first contact surface 211.

[0051] See Figures 2 - 7 and Figure 9 As shown, the metal seal 5 is specifically a metal ring coaxially sleeved on the valve core 3. The lower end of the metal ring and the second contact surface 212 are both conical surface structures that cooperate with each other. When the metal ring presses against the second contact surface 212, the two conical surfaces are in a fitting state, and at this time, the secondary seal is formed between the metal ring and the second contact surface 212.

[0052] When the metal ring presses against the second contact surface 212, the two conical surfaces are in contact with each other. At this time, since the contact surfaces of the two are smooth surfaces, a high degree of surface contact can be achieved instead of line contact or point contact, thereby improving the sealing performance.

[0053] When the metal ring is completely fitted with the second contact surface 212, a continuous and uniform sealing interface is formed between the two, effectively blocking the gas leakage path. In addition, since the metal material itself has high hardness and wear resistance, the sealing performance between the metal ring and the second contact surface 212 will not easily decrease even under long-term use or frequent opening and closing operations.

[0054] See also Figures 2 - 8 As shown, the first contact surface 211 has an annular groove 2111 in which the rubber ring can be embedded. When the pressure in the valve body 1 is greater than a preset value, the rubber ring compressed in the annular groove 2111 is in a self-compensating state of maintaining sealing contact with the first contact surface 211.

[0055] When the pressure in the valve body 1 is greater than the preset value, an outward thrust is generated on the rubber ring, trying to push it away from the contact position with the first contact surface 211. However, since the rubber ring is embedded in the annular groove 2111, the range of movement of the rubber ring is limited, and the rubber ring is compressed to fit more closely on the first contact surface 211 of the inner wall of the annular groove 2111. At this time, the rubber ring not only relies on the elastic deformation of its own material to adapt to the pressure, but also uses the support given by the annular groove 2111 to ensure that it can maintain a sealed contact state with the first contact surface 211 even under high pressure. The possibility of gas leakage is effectively prevented, and the shape of the rubber ring is automatically adjusted to cope with pressure changes without relying on external forces.

[0056] On the contrary, if the pressure in the valve body 1 decreases, the pressure inside the rubber ring may be lower than the external pressure, and the rubber ring has a tendency to shrink inward. Since the rubber ring is pre-compressed and placed in the annular groove 2111, it will receive support from the side wall of the annular groove 2111, which helps the rubber ring maintain its shape and maintain good sealing contact with the first contact surface 211. In addition, the annular groove 2111 can also accommodate small changes in the volume of the rubber ring caused by temperature changes, ensuring that the rubber ring is always in the best working condition.

[0057] As the use time increases, the rubber ring may become slightly loose, but due to the constraints of the annular groove 2111 on its surroundings, it can still ensure that the rubber ring will not easily move away from its original position, providing a stable reference position for the rubber ring so that it can continue to perform its sealing function.

[0058] See also Figures 2 - 8As shown, a rubber layer 2112 is provided on the first contact surface 211 and fits therewith. When the rubber ring is pressed into the annular groove 2111, the rubber layer 2112 is extruded by the rubber ring and is in a deformed state of being passively embedded in the annular groove 2111, so that the rubber ring is wrapped in the rubber layer 2112.

[0059] When the rubber ring is pressed into the annular groove 2111 on the first contact surface 211, the rubber layer 2112 provided on and fitting with the first contact surface 211 is extruded by the rubber ring and deforms. During the extrusion of the rubber layer 2112, due to the pressure from the rubber ring, the rubber layer 2112 is forced to partially embed into the space inside the annular groove 2111.

[0060] As the rubber ring is further tightened, the rubber layer 2112 gradually wraps around the outer edge of the rubber ring, so that the rubber ring not only indirectly makes close contact with the annular groove 2111 through the rubber layer 2112, but is also surrounded by the rubber layer 2112. The sealing effect between the rubber ring and the first contact surface 211 is enhanced. Since the elastic deformation of the rubber layer 2112 can fill the possible tiny gaps between the rubber ring and the annular groove 2111, a more stable and comprehensive sealing interface is formed. It ensures that even under pressure fluctuations, a high degree of airtightness can be maintained.

[0061] See Figures 2 - 7 and Figure 9 As shown, the metal ring can move along the axial direction of the valve core 3. An upper valve sleeve 31 is provided on the valve core 3. A first corrugated spring 311 is connected between the upper valve sleeve 31 and the metal ring. When the metal ring presses against the second contact surface 212, the first corrugated spring 311 is compressed, so that the metal ring and the second contact surface 212 are in a self-compensating state of maintaining sealed contact.

[0062] When the metal ring presses against the second contact surface 212 as the valve core 3 moves, the first corrugated spring 311 fixedly connected between the upper valve sleeve 31 on the valve core 3 and the metal ring is gradually compressed. The compression of the first corrugated spring 311 not only provides a pre-tightening force, enabling the metal ring to closely fit on the second contact surface 212, but also allows a certain degree of elastic compensation. This means that even in the face of manufacturing tolerances, installation errors, or slight vibrations and pressure fluctuations during operation, the elastic energy of the first corrugated spring 311 can automatically adjust the position of the metal ring to ensure that it always maintains the best sealed contact state with the second contact surface 212.

[0063] Through the self-compensating mechanism, regardless of how the external conditions change, the sealing performance between the metal ring and the second contact surface 212 can be effectively maintained, thus ensuring the airtightness of the valve body 1 and providing strong support for achieving efficient and reliable sealing.

[0064] See Figures 2 - 7 andFigure 9 As shown, a lower valve sleeve 32 is further provided on the valve core 3. A second corrugated spring 321 is connected between the lower valve sleeve 32 and the metal ring. When the metal ring presses against the second contact surface 212, the second corrugated spring 321 is stretched, enhancing the self-compensation state between the metal ring and the second contact surface 212.

[0065] When the metal ring presses against the second contact surface 212 as the valve core 3 moves, the second corrugated spring 321 fixedly connected between the lower valve sleeve 32 on the valve core 3 and the metal ring is stretched. The stretching of the second corrugated spring 321 provides an additional reverse force for the metal ring, and the reverse force enhances the contact pressure between the metal ring and the second contact surface 212, further ensuring the sealing effect.

[0066] The second corrugated spring 321 not only compensates for the possible small installation gaps or dimensional changes caused by thermal expansion and contraction of materials, but also enhances the self-compensation ability of the metal ring seal. Whether in the initial installation state or during subsequent use when encountering pressure and temperature fluctuations, the second corrugated spring 321 can cooperate with the first corrugated spring 311 to adjust the position and contact pressure of the metal ring, ensuring that the metal ring and the second contact surface 212 always maintain a stable and efficient sealed contact state, enhancing the sealing effect.

[0067] See Figures 2 - 7 and Figure 10 As shown, a first magnetic sticker 111 is provided on the lower surface of the upper valve sleeve 31. A second magnetic sticker 112 is provided below the first magnetic sticker 111 and is installed in the passage 11 of the valve body 1. When the valve port 22 is closed, the first magnetic sticker 111 and the second magnetic sticker 112 come into contact, forming a magnetic contact surface that keeps the double-layer sealing structure in close contact with the step 21.

[0068] During the process of closing the valve port 22, the valve core 3 moves downward under the action of the compression spring 13 until the valve port 22 is completely closed. The first magnetic sticker 111 descends together with the upper valve sleeve 31 and finally comes into close contact with the second magnetic sticker 112 located below it. The magnetic contact between the two not only enhances the overall stability between the valve core 3 and the valve seat 2, but also provides an additional holding force between the double-layer sealing structure and the step 21, ensuring that the rubber seal 4 and the metal seal 5 always fit tightly with the corresponding contact surfaces. Even in the face of external vibrations or pressure fluctuations, it can ensure the continuous and reliable sealing effect between the double-layer sealing structure and the step 21.

[0069] When the valve port 22 is opened, the valve core 3 rises away from the valve seat 2 position, thus allowing gas to flow through. As the valve core 3 moves upward, the first magnetic tile 111 also moves upward with the valve core 3, gradually moving away from the second magnetic tile 112. The magnetic contact surface between the first magnetic tile 111 and the second magnetic tile 112 is released, and no additional holding force is provided. This means that the tight contact state between the double-layer sealing structure and the step 21 on the valve seat 2 is also released, enabling gas to pass smoothly through the valve port 22.

[0070] Meanwhile, due to the upward movement of the valve core 3, the first corrugated spring 311 and the second corrugated spring 321 will also change accordingly. The first corrugated spring 311 returns from the compressed state, while the second corrugated spring 321 returns from the stretched state. This provides the necessary elastic preparation for re-establishing a firm self-compensating seal when the valve port 22 is closed next time.

[0071] See Figures 2 - 7 and Figure 11 As shown, the lower end of the channel 11 of the valve body 1 has a slope extending inward, and the metal ring has a flange 51 that can contact the slope. When the valve port 22 is closed, the flange 51 fits against the slope, forming a sealing contact surface that prevents gas from flowing back and pushing open the metal ring, causing the valve core 3 to rise and open the valve port 22.

[0072] During the process of the valve core 3 moving downward under the action of the compression spring 13 until the valve port 22 is completely closed, the metal ring descends accordingly, and the flange 51 on it gradually approaches and finally fits against the slope at the lower end of the channel 11 of the valve body 1. This enables the flange 51 to closely press against the slope, forming an effective sealing contact surface, which plays a role in preventing gas from flowing back.

[0073] During the process of gas flowing back through the valve port 22, an upward thrust will be exerted on the upper valve sleeve 31. However, due to the tight fit between the flange 51 and the slope, the pressure of the flowing-back gas cannot be applied to the upper valve sleeve 31, so the metal ring blocks the flowing-back pressure outside. This effectively prevents the possibility of gas flowing back and pushing open the metal ring, ensuring that the valve core 3 will not accidentally rise and open the valve port 22 due to the flowing-back pressure, and enhancing the one-way flow characteristic of the valve body 1.

[0074] In the present invention, the rubber seal 4 and the metal seal 5 respectively contact the first contact surface 211 and the second contact surface 212 on the valve seat 2 to form a firm primary seal and secondary seal, providing additional safety protection against pressure or temperature changes.

[0075] As the rubber ring is embedded in the annular groove 2111 and wrapped by the rubber layer 2112, it automatically adjusts its shape to maintain tight contact and prevent gas leakage. Meanwhile, the first corrugated spring 311 and the second corrugated spring 321 respectively provide a pre-tightening force and elastic compensation for the metal ring.

[0076] When the valve port 22 is closed, the magnetic contact surface formed by the mutual adsorption between the first magnetic tile 111 and the second magnetic tile 112 enhances the stability of the valve core 3 and the valve seat 2, and provides an additional holding force for the double-layer sealing structure.

[0077] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A carbon dioxide solenoid valve with a self-compensating double-stage seal, comprising a valve body and a solenoid controller, wherein the valve body is provided with a valve seat, the valve seat is provided with a valve port and a valve core that can be inserted into the valve port, the valve body is provided with a channel for the valve core to move along the axial direction of the valve port, and the solenoid controller has a compression spring for returning the valve core downward; It is characterized in that The valve core is provided with a double-layer sealing structure, and the valve seat has a step that cooperates with the double-layer sealing structure and is used to close the valve port. When the double-layer sealing structure is in contact with the step, a primary seal and a secondary seal are formed therebetween from bottom to top in sequence; The double-layer sealing structure is provided with a rubber seal and a metal seal in sequence from the lower end of the valve core upward, and the step has a first contact surface capable of contacting the rubber seal and a second contact surface capable of contacting the metal seal; The first contact surface has an annular groove in which the rubber seal can be embedded. When the pressure in the valve body is greater than a preset value, the rubber seal compressed in the annular groove is in a self-compensating state of maintaining sealing contact with the first contact surface.

2. A carbon dioxide solenoid valve with self-compensating double-stage sealing according to claim 1, characterized in that: A rubber layer is provided on the first contact surface to fit the first contact surface. When the rubber seal is pressed into the annular groove, the rubber layer is squeezed by the rubber seal and is in a deformed state of being passively embedded in the annular groove, so that the rubber seal is wrapped in the rubber layer.

3. A carbon dioxide solenoid valve with self-compensating double-stage sealing according to claim 1, characterized in that: The metal seal can move along the axial direction of the valve core, and an upper valve sleeve is provided on the valve core. A first wave spring is connected between the upper valve sleeve and the metal seal. When the metal seal presses against the second contact surface, the first wave spring is compressed, so that the metal seal and the second contact surface are in a self-compensating state of maintaining sealing contact.

4. A carbon dioxide solenoid valve with self-compensating double-stage sealing according to claim 3, characterized in that: A lower valve sleeve is also provided on the valve core, and a second wave spring is connected between the lower valve sleeve and the metal seal. When the metal seal presses against the second contact surface, the second wave spring is stretched, so that the self-compensation state between the metal seal and the second contact surface is enhanced.

5. A carbon dioxide solenoid valve with self-compensating double-stage sealing according to claim 3, characterized in that: A first magnetic patch is provided on the lower surface of the upper valve sleeve, and a second magnetic patch installed in the channel of the valve body is provided below the first magnetic patch to cooperate with the first magnetic patch. When the valve port is closed, the first magnetic patch and the second magnetic patch contact to form a magnetic contact surface that keeps the double-layer sealing structure in close contact with the step.

6. A carbon dioxide solenoid valve with self-compensating double-stage sealing according to claim 1, characterized in that: The lower end of the channel of the valve body has a slope extending inward, and the metal seal has a flange that can contact the slope. When the valve port is closed, the flange fits against the slope to form a sealing contact surface that prevents gas backflow from pushing open the metal seal and causing the valve core to rise and open the valve port.

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