A thermal management system coolant check valve

Abstract

This invention discloses a refrigerant check valve for a thermal management system, comprising a valve body, a sealing plate, and a valve stem. The valve body is installed inside a pipeline, the sealing plate is fitted onto the valve body, and the valve stem is vertically positioned at the bottom of the sealing plate. A baffle is provided at the bottom of the valve stem. An O-ring 1 is fitted into the annular groove of the valve body, and an O-ring 2 is fitted into the annular groove of the sealing plate. A drainage channel is vertically provided at the bottom of the valve body. When the system refrigerant pressure is greater than or equal to the preload of spring 123, the sealing plate 110 moves upward to open the channel. When the sealing plate 110 moves upward, it drives the valve stem 120 and the baffle 121 to move upward. When the baffle 121 contacts the bottom of the limiting platform 130, the compression of spring 123 remains unchanged, thereby preventing spring 123 from being compressed to a "completely compressed" state. This avoids material fatigue and a decrease in elastic modulus after long-term use of spring 123, reducing the probability of spring 123 failure and the wear rate of O-ring 140, thereby reducing the risk of refrigerant leakage.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology in thermal management systems, and specifically to a refrigerant check valve for a thermal management system. Background Technology

[0002] The refrigerant check valve is a core fluid control component in thermal management systems (such as thermal management in new energy vehicles, industrial refrigeration, and residential central air conditioning). Its typical structure includes: a sealing plate, an O-ring, a valve body, a spring, and a spring baffle. Its working principle is as follows: when the system refrigerant pressure is greater than or equal to the spring preload, the sealing plate moves upward to open the passage; after the pressure decreases, the spring returns to its original position, pushing the sealing plate to close, achieving one-way shut-off.

[0003] Existing refrigerant check valves lack a stroke limit design, resulting in the following key defects under high-pressure conditions: Springs are prone to fatigue failure due to compression: Under high pressure impact (such as the pressure of the thermal management system of a new energy vehicle suddenly rising to 4.0MPa), the sealing plate drives the spring baffle to continuously displace, and the spring is compressed to the "complete compression" state (no gap between the spring coils). The spring deformation rate under a single impact reaches 15%-20%. After long-term use, the spring material fatigues, the elastic modulus decreases, and the failure probability increases by more than 60% compared with the non-compression state.

[0004] Excessive wear of seals: The lack of positioning leads to uncontrollable displacement of the sealing plate, and the O-ring is in a state of excessive compression (compression > 35%) or excessive stretching for a long time. After 1000 cycles, the wear rate of the O-ring reaches 30%, which directly causes the risk of refrigerant leakage.

[0005] When the fluid flow in the drainage channel is uneven, the force exerted by the fluid on the sealing plate is uneven, which can easily cause vibration of the sealing plate and valve stem, reducing the service life of the check valve. Therefore, a refrigerant check valve for a thermal management system is needed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a refrigerant check valve for a thermal management system.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0008] A refrigerant check valve for a thermal management system, comprising: The valve consists of a valve body, a sealing plate, and a valve stem. The valve body is installed inside the pipeline. The sealing plate is fitted onto the valve body. The valve stem is vertically positioned at the bottom of the sealing plate and extends vertically downward through the bottom of the valve body. A baffle is located at the bottom of the valve stem. An O-ring 1 is fitted into the annular groove of the valve body, and an O-ring 2 is fitted into the annular groove of the sealing plate. Three drainage channels are vertically positioned at the bottom of the valve body and evenly distributed. A limiting platform is located at the bottom of the valve body. The center of the limiting platform is an annular surface. The valve stem passes through the central hole of the limiting platform. A spring 1 is fitted onto the valve stem. The top of the spring 1 contacts the bottom of the rubber ring, and the bottom of the spring 1 contacts the top of the baffle. An adjusting mechanism is located on the limiting platform. A limiting plate is located below the limiting platform and is positioned at the bottom of the baffle and in contact with the baffle.

[0009] As a further improvement to this technical solution, the adjustment mechanism includes adjustment component one, adjustment component two, and adjustment component three. Adjustment component one, adjustment component two, and adjustment component three are respectively located at the bottom of the three drainage channels. Adjustment component one, adjustment component two, and adjustment component three have the same structure and are evenly arranged around the circumference of the limiting platform. Adjustment component one includes a sealing plate, a connecting sleeve, and a connecting column. The sealing plate is located at the bottom of the drainage channel and is arranged horizontally. In the initial state, the sealing plate is close to the bottom edge of the drainage channel. One end of the connecting sleeve is connected to the side wall of the sealing plate, and the other end of the connecting sleeve extends horizontally. There are two connecting sleeves. The connecting column is horizontally arranged at the bottom of the valve body and is sleeved inside the connecting sleeve.

[0010] As a further improvement to this technical solution, a support plate is set on the top of the limiting platform, and a top rod is set on the support plate. The top rod passes vertically through the surface of the support plate, and the top end of the top rod is connected to the bottom of the sealing plate by a connecting rod. A connecting ring is set on the top rod, and the connecting ring is located below the support plate. The bottom end of the top rod is located below the limiting platform. A second spring is sleeved on the top rod. One end of the second spring contacts the bottom of the support plate, and the other end of the second spring contacts the top of the connecting ring.

[0011] As a further improvement to this technical solution, a rubber sleeve is provided at the bottom of the limiting platform. When the baffle moves up, the baffle extends into the rubber sleeve.

[0012] As a further improvement to this technical solution, a rubber ring is fitted inside the central hole at the bottom of the valve body, and the valve stem passes through the rubber ring.

[0013] As a further improvement to this technical solution, the axial height H of the limiting stage 130 = the free length of the spring L1 - the working limit compression length of the spring-123 L2 - 0.5mm~1mm.

[0014] As a further improvement to this technical solution, the surface roughness Ra of the limiting stage 130 is ≤1.6μm.

[0015] As a further improvement to this technical solution, the length of the valve stem 120 is matched with the height of the limiting platform 130.

[0016] Compared with the prior art, the progress and advantages of this invention are as follows: During the use of this invention, when the system refrigerant pressure is greater than or equal to the preload of spring one, the sealing plate moves upward to open the channel; when the sealing plate moves upward, it drives the valve stem and the baffle to move upward. When the baffle contacts the bottom of the limiting platform, the compression of spring one remains unchanged, thereby preventing spring one from being compressed to a "completely compressed" state, avoiding material fatigue and a decrease in elastic modulus after long-term use of spring one, and reducing the probability of spring one failure. A limiting plate is provided below the limiting platform. The limiting plate is located at the bottom of the baffle and contacts the baffle, preventing O-ring one from being in an over-compressed or over-stretched state for a long time, reducing the wear rate of O-ring one, and thus reducing the risk of refrigerant leakage. The baffle moves upward and abuts against the bottom of the push rod, thereby driving the push rod to move upward, which in turn pushes the sealing plate to move, thus moving the sealing plate to the bottom of the drainage channel, thereby reducing the drainage orifice diameter of the drainage channel. When the fluid flow in the three drainage channels is uneven, the force of the fluid on the sealing plate is uneven, and the sealing plate tilts slightly, which in turn causes the baffle to tilt slightly. The tilting direction of the baffle is opposite to that of the sealing plate, which causes the push rods on the adjusting components 1, 2, and 3 to move up and down different distances. Therefore, the fluid flow can be adjusted to be uniform, thereby driving the sealing plate to reach a new balance, avoiding vibration of the sealing plate and valve stem, and improving the service life of the check valve. Without adding complex components (such as additional limit pins or sensors), the integrated valve body design reduces manufacturing costs and is compatible with existing assembly processes, facilitating mass production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the bottom of the valve body of the present invention.

[0020] Figure 3 This is a schematic diagram showing the fit between the sealing pressure plate and the valve body of the present invention.

[0021] Figure 4 This is a schematic diagram of the adjustment mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the cooperation between the baffle and the adjustment mechanism of the present invention.

[0023] Figure 6 This is a schematic diagram showing the distribution of adjustment component one, adjustment component two, and adjustment component three of the present invention.

[0024] Figure 7 This is a schematic diagram of the fit between the top rod and the sealing plate of the present invention.

[0025] The diagram indicates: 10. Valve body; 110. Sealing plate; 120. Valve stem; 121. Baffle; 122. Rubber sleeve; 123. Spring 1; 124. Rubber ring; 130. Limiting platform; 131. Limiting plate; 140. O-ring 1; 150. O-ring 2; 160. Drainage channel; 20. Adjustment mechanism; 210. Adjustment component one; 211. Support plate; 212. Sealing plate; 213. Connecting sleeve; 214. Connecting column; 215. Connecting rod; 216. Top rod; 217. Connecting ring; 220. Adjustment component two; 230. Adjustment component three. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they 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 orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figures 1-7 As shown, a refrigerant check valve for a thermal management system includes: The valve body 10, sealing plate 110, and valve stem 120 are installed inside the pipeline. The sealing plate 110 is fitted onto the valve body 10. The valve stem 120 is vertically positioned at the bottom of the sealing plate 110, extending vertically downwards through the bottom of the valve body 10. A baffle 121 is provided at the bottom of the valve stem 120. An O-ring 140 is fitted into the annular groove of the valve body 10, and an O-ring 150 is fitted into the annular groove of the sealing plate 110. A drain channel 160 is vertically provided at the bottom of the valve body 10. Three valves are evenly arranged. A limiting platform 130 is provided at the bottom of the valve body 10. The middle part of the limiting platform 130 is an annular surface. The valve stem 120 passes through the central hole of the limiting platform 130. A spring 123 is sleeved on the valve stem 120. The top of the spring 123 contacts the bottom of the rubber ring 124, and the bottom of the spring 123 contacts the top of the baffle 121. An adjustment mechanism 20 is provided on the limiting platform 130. A limiting plate 131 is provided below the limiting platform 130. The limiting plate 131 is located at the bottom of the baffle 121 and contacts the baffle 121.

[0031] More specifically, the regulating mechanism 20 includes regulating component 1 210, regulating component 220, and regulating component 3 230. Regulating component 1 210, regulating component 220, and regulating component 3 230 are respectively located at the bottom of the three drainage channels 160. Regulating component 1 210, regulating component 220, and regulating component 3 230 have the same structure and are evenly arranged around the circumference of the limiting platform 130. Regulating component 1 210 includes a sealing plate 212, a connecting sleeve 213, and a connecting post 214. The sealing plate 212 is located at the bottom of the drainage channel 160 and is arranged horizontally. In the initial state, the sealing plate 212 is tightly attached to the bottom edge of the drainage channel 160. One end of the connecting sleeve 213 is connected to the side wall of the sealing plate 212, and the other end of the connecting sleeve 213 extends horizontally. There are two connecting sleeves 213. The connecting post 214 is horizontally arranged at the bottom of the valve body 10 and is fitted inside the connecting sleeve 213.

[0032] More specifically, the support plate 211 is located on the top of the limiting platform 130. A top rod 216 is provided on the support plate 211, which vertically passes through the surface of the support plate 211. The top end of the top rod 216 is connected to the bottom of the sealing plate 212 by a connecting rod 215. A connecting ring 217 is provided on the top rod 216, which is located below the support plate 211. The bottom end of the top rod 216 is located below the limiting platform 130. A spring is sleeved on the top rod 216. One end of spring 2 contacts the bottom of support plate 211, and the other end of spring 2 contacts the top of connecting ring 217. When the system refrigerant pressure is greater than or equal to the preload of spring 123, sealing plate 110 moves upward to open the channel. When sealing plate 110 moves upward, it drives valve stem 120 and baffle 121 to move upward. When baffle 121 contacts the bottom of limiting platform 130, the compression of spring 123 remains unchanged, thereby preventing spring 123 from being compressed to a "completely compressed" state. This avoids material fatigue and a decrease in elastic modulus after long-term use of spring 123, reducing the probability of spring 123 failure. In the initial state, limiting plate 131 contacts baffle 121. When baffle 121 contacts the bottom of limiting platform 130, it prevents O-ring 140 from being in an over-compressed (compression > 35%) or over-stretched state for a long time, reducing the wear rate of O-ring 140 and thus reducing the risk of refrigerant leakage.

[0033] like Figures 2-3 As shown, a rubber sleeve 122 is provided at the bottom of the limiting platform 130. When the baffle 121 moves upward, the baffle 121 extends into the rubber sleeve 122, which can reduce the direct force between the baffle 121 and the limiting platform 130.

[0034] like Figure 5 As shown, a rubber ring 124 is fitted inside the central hole at the bottom of the valve body 10, and the valve stem 120 passes through the rubber ring 124.

[0035] More specifically, the axial height H of the limiting platform 130 = the free length of the spring L1 - the working limit compression length of the spring-123 L2 - 0.5mm~1mm, to avoid the rigid collision between the baffle 121 and the limiting platform 130, which may cause abnormal noise or wear.

[0036] More specifically, the surface roughness Ra of the limiting stage 130 is ≤1.6μm to reduce frictional loss when in contact with the baffle 121.

[0037] More specifically, the length of the valve stem 120 is matched with the height of the limiting platform 130 to ensure that when the limiting platform 130 is triggered, the displacement of the sealing plate 110 just meets the refrigerant flow requirements (flow cross-sectional area ≥ 95% of the existing structure), with no flow loss.

[0038] Working principle: During use, when the system refrigerant pressure is greater than or equal to the preload of spring 123, the sealing plate 110 moves upward to open the passage. As the sealing plate 110 moves upward, it causes the valve stem 120 and baffle 121 to move upward. When the baffle 121 contacts the bottom of the limiting platform 130, the compression of spring 123 remains unchanged, thus preventing spring 123 from being compressed to "complete compression". To prevent material fatigue and a decrease in elastic modulus after long-term use of spring 123, thus reducing the probability of spring 123 failure, in the initial state, the limiting plate 131 contacts the baffle 121. When the baffle 121 contacts the bottom of the limiting platform 130, it prevents the O-ring 140 from being in an over-compressed (compression > 35%) or over-stretched state for a long time, reducing the wear rate of the O-ring 140 and thus reducing the risk of refrigerant leakage. The baffle 121 moves upward and abuts against the bottom of the push rod 216, thereby driving the push rod 216 upward, which in turn causes the connecting rod 215 to push the sealing plate 212 to move, thus moving the sealing plate 212 to the bottom of the drain channel 160, thereby... By reducing the drainage orifice diameter of the drainage channel 160, when the fluid flow in the three drainage channels 160 is uneven, the force exerted by the fluid on the sealing plate 110 is uneven, causing the sealing plate 110 to tilt slightly, which in turn causes the baffle 121 to tilt slightly. Furthermore, the tilting direction of the baffle 121 is opposite to that of the sealing plate 110, resulting in different vertical movement distances of the push rods 216 on the adjusting components 1 210, 220, and 230. Therefore, the flow of fluid can be uniformly adjusted, thereby driving the sealing plate 110 to reach a new balance, preventing vibration of the sealing plate 110 and valve stem 120, and improving the service life of the check valve.

[0039] It should be stated that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to the present invention. However, such variations, as long as they do not depart from the spirit of the present invention, should be within the scope of protection of the present invention. Furthermore, some terminology used in this specification and claims is not limiting, but merely for ease of description.

Claims

1. A thermal management system coolant one-way valve characterized by, It includes: The valve consists of a valve body, a sealing plate, and a valve stem. The valve body is installed inside the pipeline. The sealing plate is fitted onto the valve body. The valve stem is vertically positioned at the bottom of the sealing plate and extends vertically downward through the bottom of the valve body. A baffle is located at the bottom of the valve stem. An O-ring 1 is fitted into the annular groove of the valve body, and an O-ring 2 is fitted into the annular groove of the sealing plate. Three drainage channels are vertically positioned at the bottom of the valve body and evenly distributed. A limiting platform is located at the bottom of the valve body. The center of the limiting platform is an annular surface. The valve stem passes through the central hole of the limiting platform. A spring 1 is fitted onto the valve stem. The top of the spring 1 contacts the bottom of the rubber ring, and the bottom of the spring 1 contacts the top of the baffle. An adjusting mechanism is located on the limiting platform. A limiting plate is located below the limiting platform and is positioned at the bottom of the baffle and in contact with the baffle.

2. The refrigerant check valve for a thermal management system according to claim 1, characterized in that, The regulating mechanism includes regulating component one, regulating component two, and regulating component three. Regulating component one, regulating component two, and regulating component three are located at the bottom of the three drainage channels respectively. Regulating component one, regulating component two, and regulating component three have the same structure and are evenly arranged around the circumference of the limiting platform. Regulating component one includes a sealing plate, a connecting sleeve, and a connecting column. The sealing plate is located at the bottom of the drainage channel and is arranged horizontally. In the initial state, the sealing plate is close to the bottom edge of the drainage channel. One end of the connecting sleeve is connected to the side wall of the sealing plate, and the other end of the connecting sleeve extends horizontally. There are two connecting sleeves. The connecting column is horizontally set at the bottom of the valve body and is sleeved inside the connecting sleeve.

3. The refrigerant check valve for a thermal management system according to claim 2, characterized in that, The support plate is set on the top of the limiting platform. A top rod is set on the support plate. The top rod passes vertically through the surface of the support plate. The top end of the top rod is connected to the bottom of the sealing plate by a connecting rod. A connecting ring is set on the top rod. The connecting ring is located below the support plate. The bottom end of the top rod is located below the limiting platform. A second spring is sleeved on the top rod. One end of the second spring contacts the bottom of the support plate, and the other end of the second spring contacts the top of the connecting ring.

4. The refrigerant check valve for a thermal management system according to claim 3, characterized in that, The bottom of the limiting platform is equipped with a rubber sleeve. When the baffle moves up, the baffle extends into the rubber sleeve.

5. The refrigerant check valve for a thermal management system according to claim 4, characterized in that, A rubber ring is fitted inside the center hole at the bottom of the valve body, and the valve stem passes through the rubber ring.

6. The refrigerant check valve for a thermal management system according to claim 5, characterized in that, The axial height H of the limiting stage = the free length of the spring L1 - the working limit compression length of spring L2 - 0.5mm~1mm.

7. The refrigerant check valve for a thermal management system according to claim 3, characterized in that, The surface roughness of the limiting stage is Ra≤1.6μm.

8. The refrigerant check valve for a thermal management system according to claim 3, characterized in that, The valve stem length is matched with the height of the limit platform.

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