Carbon dioxide electromagnetic valve with self-compensation type two-stage sealing

Abstract

The invention relates to the technical field of electromagnetic valve sealing, in particular to a carbon dioxide electromagnetic valve with self-compensation type two-stage sealing, which comprises a valve body and an electromagnetic controller, a valve seat is arranged in the valve body, a valve port and a valve core are arranged on the valve seat, and the electromagnetic controller is provided with a compression spring enabling the valve core to reset downwards. A double-layer sealing structure is arranged on the valve element, the valve seat is provided with a step matched with the double-layer sealing structure, the double-layer sealing structure is provided with a rubber sealing piece and a metal sealing piece, and the step is provided with a first contact face capable of making contact with the rubber sealing piece and a second contact face making contact with the metal sealing piece. And the first contact surface is provided with an annular groove in which the rubber sealing element can be embedded. Stable first-stage sealing and second-stage sealing are formed through contact between the rubber sealing piece and the first contact face and between the metal sealing piece and the second contact face, and meanwhile pressure self-compensation is achieved by embedding the rubber sealing piece into the annular groove.

Description

Technical Field

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

[0002] The CO2 solenoid valve is used to control the flow of CO2 gas. Conventional CO2 solenoid valves usually use metal-to-metal or rubber seals to achieve the closing function. However, the existing technology is prone to seal failure under high pressure or low temperature environment, resulting in gas leakage, which in turn affects the stability and reliability of the solenoid valve.

[0003] At present, a Chinese invention patent application (publication number CN117759761A) discloses a highly sealed solenoid valve, whose structure includes 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 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 line is connected to the valve body, the valve seat mechanism includes a valve seat body, a valve seat body is provided at the bottom of the valve body, a partition is fixedly connected to the inside of the valve seat 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 installed on the first mounting plate, and the second mounting plate is fixedly connected to the valve seat body, the control mechanism includes coil turns, the inside of the valve body The valve body is fixedly connected with a coil turn, and a fixed iron core is fixedly connected inside the valve body. A first spring is fixedly connected to the fixed iron core, and a moving iron core is fixedly connected to the first spring. The moving iron core is arranged inside the coil turn, and a valve core is fixedly connected to the moving iron core. The cross-section of the moving iron core is rectangular, and the bottom of the cross-section of the valve core is triangular. The sealing mechanism includes a push rod, and the moving iron core is fixedly connected with a push rod. A connecting rod is slidably connected to the partition, and a push block is fixedly connected to the connecting rod. The push block is slidably connected to the inside of the partition, and a corrosion-resistant air cushion is fixedly connected to the partition, and a through pipe is fixedly connected to the corrosion-resistant air cushion, and the through pipe is connected to the inner cavity where the push block is located. A second spring is wound on the connecting rod, and 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-mentioned prior art inflates the interior of the corrosion-resistant air cushion through a through pipe, causing the corrosion-resistant air cushion to expand and fit onto the valve core, thereby facilitating further sealing of the air cushion at the valve mouth when the valve is closed, thereby improving the sealing performance at the valve mouth. However, when the pressure and temperature change, the volume of the gas in the air cushion may change accordingly. High pressure may cause the air cushion to be over-compressed and reduce the sealing efficiency, while low pressure or temperature drop may cause the gas in the air cushion to shrink, resulting in incomplete sealing. Therefore, there is a 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, ensuring that stable sealing performance can be maintained under different working environments. Summary of the invention

[0005] In view of the problems existing in the prior art, a carbon dioxide solenoid valve with a self-compensating double-stage seal is provided, in which a rubber seal and a metal seal are respectively in contact with a first contact surface and a second contact surface on a valve seat to form a stable primary seal and a secondary seal, providing additional safety protection to cope with pressure or temperature changes.

[0006] To solve the problems of the prior art, the present invention provides a carbon dioxide solenoid valve with a self-compensating double-stage seal, comprising a valve body, a valve seat being provided in the valve body, a valve port and a valve core capable of being inserted into the valve port being provided on the valve seat, a channel for the valve core to move along the axial direction of the valve port being provided on the valve body, a double-layer sealing structure being provided on the valve core, the valve seat having a step cooperating with the double-layer sealing structure and used to close the valve port, and when the double-layer sealing structure is in contact with the step, a primary seal and a secondary seal are sequentially formed between the two from bottom to top, and an electromagnetic controller for controlling the valve core to move upward away from the valve port is provided on the valve body, and 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, 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.

[0008] Preferably, the rubber seal is 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 the primary seal is formed between the rubber ring and the first contact surface.

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

[0010] Preferably, the first contact surface has an annular groove in which the rubber ring can be embedded, and when the pressure in 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 sealing contact with the first contact surface.

[0011] Preferably, a rubber layer is provided on the first contact surface to fit therewith, and when the rubber ring is pressed into the annular groove, the rubber layer is squeezed 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 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 ring. When the metal ring presses against the second contact surface, the first wave spring is compressed, so that the metal ring and the second contact surface are in a self-compensating state of maintaining sealing contact.

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

[0014] Preferably, 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.

[0015] Preferably, the lower end of the channel of the valve body has a slope extending inward, and the metal ring 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 ring and causing the valve core to rise and open the valve port.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention forms a stable primary and secondary seal 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, thereby forming a double-layer seal synchronously, providing additional safety protection when facing pressure or temperature changes.

[0017] In the sealed state, the rubber seal can ensure the effectiveness of the primary seal in small irregularities or gaps due to elastic deformation, while the metal seal provides a strong secondary seal with its high hardness and wear resistance. Even under pressure or temperature changes, it can maintain the overall sealing performance and prevent gas leakage.

[0018] 2. The present invention embeds the rubber ring into the annular groove on the first contact surface, thereby achieving a self-compensating sealing effect for pressure changes. When the pressure in the valve body changes, the rubber ring automatically adjusts its shape to maintain close contact with the first contact surface by relying on the support and restriction provided by the annular groove, effectively preventing gas leakage.

[0019] At the same time, the rubber layer is squeezed into the annular groove and wraps the rubber ring in it, further enhancing the sealing performance. Even if the rubber ring becomes loose after long-term use, the annular groove combined with the rubber layer can still restrain its position to ensure that the sealing function is not reduced.

[0020] 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, thereby ensuring a stable seal and being able to adapt to manufacturing tolerances, installation errors and fluctuations during operation.

[0021] In the sealed state, the first wave spring is compressed when the metal ring presses against the second contact surface, and the extension of the second wave spring provides additional reverse force for the metal ring, thereby increasing the contact pressure. This enhances the self-compensation capability in the face of temperature and pressure fluctuations and ensures air tightness.

[0022] 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 additional holding force for the double-layer sealing structure, ensuring that the rubber seal and the metal seal fit tightly with the corresponding contact surfaces.

[0023] At the same time, the flange on the metal ring fits with the slope to form a sealing interface, which effectively blocks the gas backflow and avoids accidental opening of the valve core due to backflow pressure, thereby enhancing the unidirectional flow characteristics and overall air tightness of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a carbon dioxide solenoid valve with self-compensating double-stage sealing according to the present invention.

[0025] Figure 2 It is a planar cross-sectional view of a carbon dioxide solenoid valve with a self-compensating double-stage seal according to the present invention.

[0026] Figure 3 The present invention is a three-dimensional structural cross-sectional view of a carbon dioxide solenoid valve with a self-compensating double-stage seal.

[0027] Figure 4 It is a schematic diagram of a planar state of a carbon dioxide solenoid valve with a self-compensating double-stage seal of the present invention when the valve port is closed.

[0028] Figure 5It is a schematic diagram of a planar state of a carbon dioxide solenoid valve with a self-compensating double-stage seal of the present invention when the valve port is opened.

[0029] Figure 6 It is a three-dimensional schematic diagram of a closed valve port of a carbon dioxide solenoid valve with a self-compensating double-stage seal according to the present invention.

[0030] Figure 7 It is a three-dimensional schematic diagram of a carbon dioxide solenoid valve with a self-compensating double-stage seal of the present invention with its valve port opened.

[0031] Figure 8 The present invention Figure 6 An enlarged schematic diagram of point A.

[0032] Fig. 9 The present invention Figure 6 An enlarged schematic diagram of point B.

[0033] Fig.10 The present invention Figure 6 Enlarged schematic diagram of point C.

[0034] Fig.11 The present invention Figure 6 Enlarged schematic diagram of point D.

[0035] The numbers in the figure 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 wave spring; 32. lower valve sleeve; 321. second wave spring; 4. rubber seal; 5. metal seal; 51. flange. DETAILED DESCRIPTION

[0036] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] See also Figure 1-Figure 7As shown, a carbon dioxide solenoid valve with a self-compensating double-stage seal comprises a valve body 1, wherein a valve seat 2 is provided in the valve body 1, wherein the valve seat 2 is provided with a valve port 22 and a valve core 3 which can be inserted into the valve port 22, wherein a channel 11 for the valve core 3 to move along the axial direction of the valve port 22 is opened on the valve body 1, wherein a double-layer sealing structure is provided on the valve core 3, wherein the valve seat 2 has a step 21 which cooperates with the double-layer sealing structure and is used to close the valve port 22, wherein when the double-layer sealing structure contacts the step 21, a primary seal and a secondary seal are sequentially formed between the two from bottom to top, wherein 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, wherein the electromagnetic controller 12 has a compression spring 13 for resetting the valve core 3 downward.

[0038] The electromagnetic controller 12 comprises a moving iron core 121 integrated with the valve core 3 and a fixed iron core 122 disposed above the moving iron core 121 , and the compression spring 13 is disposed between the moving iron core 121 and the fixed iron core 122 .

[0039] The electromagnetic controller 12 further includes a coil 123 surrounding a fixed iron core 122 .

[0040] When current passes through the coil 123, a magnetic field is generated, which acts between the moving iron core 121 and the fixed iron core 122, generating an attraction 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 to leave the valve port 22 position, allowing gas to flow. On the contrary, the compression spring 13 will push the moving iron core 121 back to its original position, realizing the closure of the valve port 22.

[0041] Under normal working conditions, due to the force of the compression spring 13, the valve core 3 is tightly pressed against the valve seat 2. At this time, the first-level seal and the second-level seal in the double-layer sealing structure are in close contact with the steps 21 on the valve seat 2, respectively, ensuring that the valve port 22 is in a completely closed state, effectively preventing gas leakage.

[0042] However, when the pressure or temperature inside the valve body 1 changes, even if the primary seal is slightly displaced or deformed, it cannot maintain the optimal sealing state. The secondary seal can still play a role and continue to effectively block the passage of gas, maintaining the overall sealing performance.

[0043] See also Figure 2-Figure 9 As shown, the double-layer sealing 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, and 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.

[0044] When the elastic force of the compression spring 13 pushes the movable iron core 121 downward, the valve core 3 connected thereto is driven to fit closely on the valve seat 2. At this time, the rubber seal 4 and the metal seal 5 in the double-layer sealing structure contact the first contact surface 211 and the second contact surface 212 on the valve seat 2 respectively, forming a primary seal and a secondary seal.

[0045] Specifically, the rubber seal 4 at the lower end of the double-layer sealing structure contacts the first contact surface 211 on the valve seat 2, and the contact point constitutes the first-level seal. The rubber seal 4 provides good elastic deformation ability, and can effectively fill any small gaps even in the face of slight surface unevenness or slight pressure changes to ensure airtightness.

[0046] At the same time, the metal seal 5 arranged just above the rubber seal 4 contacts the second contact surface 212 on the valve seat 2, forming a more solid second-level seal. The contact between the metal seal 5 and the second contact surface 212 relies on the friction generated by physical contact. Under the double seal, it is ensured that even if the performance of the rubber seal 4 is reduced 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.

[0047] See also Figure 2-Figure 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 the primary seal is formed between the rubber ring and the first contact surface 211 .

[0048] When the valve core 3 moves downward due to the force of the compression spring 13, the rubber ring is pressed toward the first contact surface 211 of the valve seat 2. At this time, the rubber ring is in a compressed state, which not only causes the rubber material to undergo elastic deformation, but also fills any small irregularities or gaps between the first contact surface 211 and the rubber ring, thereby ensuring a primary sealing effect between the two.

[0049] In the compressed state, the rubber ring expands and extends to a certain extent around the pressure 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.

[0050] See also Figure 2-Figure 7 and Fig. 9 As shown, the metal seal 5 is specifically a metal ring coaxially sleeved on the valve core 3, and the lower end of the metal ring and the second contact surface 212 are both conical structures that match each other. When the metal ring presses against the second contact surface 212, the two conical surfaces are in a fit state, and at this time, the secondary seal is formed between the metal ring and the second contact surface 212.

[0051] 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.

[0052] 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.

[0053] See also Figure 2-Figure 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] See also Figure 2-Figure 8As shown, a rubber layer 2112 is provided on the first contact surface 211 to fit therewith. When the rubber ring is pressed into the annular groove 2111 , the rubber layer 2112 is squeezed 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 .

[0058] When the rubber ring is pressed into the annular groove 2111 on the first contact surface 211, the rubber layer 2112 disposed on and in contact with the first contact surface 211 is squeezed by the rubber ring and deformed. During the squeezing process of the rubber layer 2112, the rubber layer 2112 is forced to partially embed into the space inside the annular groove 2111 due to the pressure from the rubber ring.

[0059] As the rubber ring is further compressed, the rubber layer 2112 gradually wraps around the outer edge of the rubber ring, so that the rubber ring is not only in close contact with the annular groove 2111 indirectly 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, and the elastic deformation of the rubber layer 2112 can fill the small gap that may exist between the rubber ring and the annular groove 2111, forming a more stable and comprehensive sealing interface. It ensures that a high degree of airtightness can be maintained even in the case of pressure fluctuations.

[0060] See also Figure 2-Figure 7 and Fig. 9 As shown, the metal ring can move along the axial direction of the valve core 3, and an upper valve sleeve 31 is provided on the valve core 3. A first wave 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 wave spring 311 is compressed, so that the metal ring and the second contact surface 212 are in a self-compensating state of maintaining sealing contact.

[0061] When the metal ring is pressed against the second contact surface 212 as the valve core 3 moves, the first wave 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 wave spring 311 not only provides a preload force, so that the metal ring can fit tightly against 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 elasticity of the first wave spring 311 can automatically adjust the position of the metal ring to ensure that it always maintains the best sealing contact state with the second contact surface 212.

[0062] Through the self-compensation mechanism, no matter how the external conditions change, the sealing performance between the metal ring and the second contact surface 212 can be effectively maintained, thereby ensuring the airtightness of the valve body 1 and providing strong support for achieving efficient and reliable sealing.

[0063] See also Figure 2-Figure 7 and Fig. 9 As shown, a lower valve sleeve 32 is also provided on the valve core 3, and a second wave 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 wave spring 321 is stretched, so that the self-compensation state between the metal ring and the second contact surface 212 is enhanced.

[0064] When the metal ring is pressed against the second contact surface 212 as the valve core 3 moves, the second wave spring 321 fixedly connected between the lower valve sleeve 32 and the metal ring provided on the valve core 3 is stretched. The stretching of the second wave spring 321 provides an additional reverse force for the metal ring, and the reverse force increases the contact pressure between the metal ring and the second contact surface 212, further ensuring the sealing effect.

[0065] The second wave spring 321 not only compensates for the possible small installation gap or the dimensional change caused by the thermal expansion and contraction of the material, but also enhances the self-compensation ability of the metal ring seal. Whether in the initial installation state or in the pressure and temperature fluctuations encountered during subsequent use, the second wave spring 321 can adjust the position and contact pressure of the metal ring in conjunction with the first wave spring 311, ensuring that the metal ring and the second contact surface 212 always maintain a stable and efficient sealing contact state, thereby enhancing the sealing effect.

[0066] See also Figure 2-Figure 7 and Fig.10 As shown, a first magnetic tile 111 is provided on the lower surface of the upper valve sleeve 31, and a second magnetic tile 112 installed in the channel 11 of the valve body 1 is provided below the first magnetic tile 111. When the valve port 22 is closed, the first magnetic tile 111 and the second magnetic tile 112 are in contact to form a magnetic contact surface that keeps the double-layer sealing structure in close contact with the step 21.

[0067] During the process of closing the valve port 22, the valve core 3 is moved downward by the force of the compression spring 13 until the valve port 22 is completely closed, and the first magnetic patch 111 descends together with the upper valve sleeve 31, and finally comes into close contact with the second magnetic patch 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 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 closely with the corresponding contact surface. Even in the face of external vibration or pressure fluctuations, the continuous and reliable sealing effect between the double-layer sealing structure and the step 21 can be guaranteed.

[0068] When the valve port 22 is opened, the valve core 3 rises and leaves the valve seat 2, allowing gas to flow. As the valve core 3 moves upward, the first magnetic patch 111 also moves upward with the valve core 3, gradually moving away from the second magnetic patch 112. The magnetic contact surface between the first magnetic patch 111 and the second magnetic patch 112 is released, and no additional holding force is provided. This means that the close contact state between the double-layer sealing structure and the step 21 on the valve seat 2 is also released, allowing gas to pass through the valve port 22 smoothly.

[0069] At the same time, due to the upward movement of the valve core 3, the first wave spring 311 and the second wave spring 321 will also change accordingly. The first wave spring 311 recovers from the compressed state, while the second wave spring 321 recovers from the stretched state. This provides the necessary elastic preparation for establishing a stable self-compensating seal again when the valve port 22 is closed next time.

[0070] See also Figure 2-Figure 7 and Fig.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 to form a sealing contact surface that prevents gas from backflowing and pushing open the metal ring, causing the valve core 3 to rise and open the valve port 22.

[0071] When the valve core 3 is moved downward by the force of the compression spring 13 until the valve port 22 is completely closed, the metal ring descends accordingly, and the flange 51 on the metal ring gradually approaches and finally fits with the slope surface at the lower end of the passage 11 of the valve body 1, so that the flange 51 can be tightly pressed against the slope surface to form an effective sealing contact surface, thereby preventing gas backflow.

[0072] In the process of gas backflow through the valve port 22, an upward thrust will be applied to the upper valve sleeve 31, but due to the close fit between the flange 51 and the slope, the backflow pressure cannot be applied to the upper valve sleeve 31, so that the metal ring blocks the backflow pressure. This effectively prevents the possibility of gas backflow pushing open the metal ring, ensures that the valve core 3 will not accidentally rise and open the valve port 22 due to the backflow pressure, and enhances the one-way flow characteristics of the valve body 1.

[0073] In the present invention, the rubber seal 4 and the metal seal 5 are in contact with the first contact surface 211 and the second contact surface 212 on the valve seat 2 respectively, so as to form a stable primary seal and a secondary seal, and provide additional safety protection to cope with pressure or temperature changes.

[0074] 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 close contact and prevent gas leakage. At the same time, the first wave spring 311 and the second wave spring 321 provide preload and elastic compensation for the metal ring respectively.

[0075] When the valve port 22 is closed, the magnetic contact surface formed by the mutual adsorption between the first magnetic patch 111 and the second magnetic patch 112 enhances the stability of the valve core 3 and the valve seat 2 and provides additional holding force for the double-layer sealing structure.

[0076] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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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