One-way valve and fluid control assembly

Abstract

The one-way valve is provided with a first area, the first area is located between a first inner side wall of a valve body and a first outer side wall of a valve element, the circulation sectional area of the first area is S1, the circulation sectional area of a valve port is S2, S1 is larger than or equal to S2, when the one-way valve works in a first state, the first area communicates with the valve port, and when the one-way valve works in a second state, the first area communicates with the valve port; fluid flows through the first area from the valve port, S1 is set to be larger than or equal to S2, pressure drop of the fluid guided out of the valve port is reduced, and therefore pressure drop of the one-way valve is reduced.

Description

Technical Field

[0001] This application relates to the technical field of valves, and particularly to a check valve and a fluid control assembly. Background Art

[0002] In an air-conditioning system, a check valve is one of the commonly used components and is installed in a passage that allows one-way flow. Usually, the check valve is installed and fixed to an integrated module or a pipeline of a flow path. How to reduce the pressure drop of the check valve is a technical problem to be improved. Summary of the Invention

[0003] The purpose of this application is to provide a check valve and a fluid control assembly, which are beneficial to reducing the pressure drop.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solution: A check valve, characterized in that: it includes a valve body and a valve core component. The check valve has a valve cavity, at least part of the valve core component is located in the valve cavity, the valve core component includes a valve core, the check valve includes a valve port part, along the axial direction of the valve body, the valve core can move to close the valve port of the valve port part; the valve body includes a first inner side wall, and the wall forming the valve cavity includes the first inner side wall. The valve core includes a first outer side wall, defining a first region. Along the radial direction of the valve core, the first region is located between the first inner side wall and the first outer side wall. The check valve includes a first state. When the check valve works in the first state, the first region communicates with the valve port, the flow cross-sectional area of the first region is S1, the flow cross-section of the valve port is defined as a second region, and the flow cross-sectional area of the second region is S2, and S1≥S2.

[0005] Another embodiment of this application adopts the following technical solution: A fluid control assembly includes a mounting part and the above-mentioned check valve. The mounting part has a mounting cavity and a fluid passage. At least part of the check valve is located in the mounting cavity. The valve body can be connected to the mounting part. The check valve has a first passage and a second passage, and a part of the fluid passage communicates with the first passage, and another part of the fluid passage communicates with the second passage.

[0006] The embodiment of this application discloses a check valve and a fluid control assembly. The check valve has a first region, which is located between the first inner side wall of the valve body and the first outer side wall of the valve core. The flow cross-sectional area of the first region is S1, and the flow cross-sectional area of the valve port is S2, and S1≥S2. When the check valve works in the first state, the first region communicates with the valve port, and the fluid flows from the valve port through the first region. Setting S1≥S2 is beneficial to reducing the pressure drop after the fluid is exported from the valve port, thereby reducing the pressure drop of the check valve. Description of the Drawings

[0007] Figure 1 is a three-dimensional structural schematic diagram of the one-way valve in this embodiment;

[0008] Figure 2 is a sectional structural schematic diagram of the one-way valve in the second state of this embodiment;

[0009] Figure 3 is a sectional structural schematic diagram of the valve core component in this embodiment;

[0010] Figure 4 is a sectional structural schematic diagram of the second component in this embodiment;

[0011] Figure 5 is Figure 2 a partial enlarged schematic diagram at A;

[0012] Figure 6 is a sectional structural schematic diagram of the one-way valve in the third state of this embodiment;

[0013] Figure 7 is an exploded structural schematic diagram of the one-way valve in this embodiment;

[0014] Figure 8 is a sectional structural schematic diagram of the fluid control component in this embodiment;

[0015] Figure 9 is Figure 8 a partial enlarged schematic diagram at B;

[0016] Figure 10 is a three-dimensional structural schematic diagram of the sealing part in this embodiment.

[0017] 1. Check valve; 10. Valve body; 10a. Valve cavity; 100b. First cavity; 100c. Second cavity; 101. First component; 1011. Wall portion; 1011a. First inner wall; 1011b. Connection portion; 1012b. Top wall; 102. Second component; 1021. Groove portion; 1021a. Step stage; 1021b. Transition section; 1021c. Guide section; 1022. Fitting portion; 103. Protrusion portion; 103a. Bottom wall; 103b. First wall; 20. First opening portion; 20a. First opening; 21. Second opening portion; 21a. Second opening; 22. First channel; 23. Second channel; 30. Spool component; 31. Spool; 311. First outer wall; 312. Second outer wall; 313. Transition wall; 314. Accommodation portion; 315. Guide portion; 316. First region; 32. Elastic member; 33. Sealing member; 34. Balance hole; 35. Limiting member; 40. Valve port portion; 40a. Valve port; 50. Fluid control assembly; 51. Mounting portion; 51a. Mounting cavity; 51b. Fluid channel; 52. Sealing portion; 52a. First abutting portion; 52b. Second abutting portion; 53. First press-fitting wall; 54. Second press-fitting wall. Detailed implementation mode

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] A check valve 1, referring to Figure 1 and Figure 2 , includes a valve body 10 and a spool component 30. The check valve 1 has a valve cavity 10a, and at least a part of the spool component 30 is located in the valve cavity 10a. The spool component 30 includes a spool 31. The check valve 1 includes an elastic member 32. One end of the elastic member 32 abuts against the spool 31, and the other end of the elastic member 32 abuts against the top wall 1012b. The elastic member 32 can apply a valve closing force to the spool 31. The check valve 1 includes a valve port portion 40, and the valve port portion 40 has a valve port 40a. Along the axial direction of the spool 31, the spool 31 can act under the action of the elastic member 32 to unidirectionally abut against the valve port portion 40 to close the valve port 40a.

[0020] The check valve 1 includes a first channel 22 and a second channel 23. The first channel 22 is located on the side of the valve body 10, and the second channel 23 is located at at least one end of the valve body 10. Along the axial direction of the spool 31, the valve port 40a is located between the first channel 22 and the second channel 23. When the pressure in the second channel 23 is greater than the pressure in the first channel 22, under the action of the pressure difference, the spool 31 is pushed open, and the fluid can flow from the second channel 23 to the first channel 22; when the fluid flows from the first channel 22 to the second channel 23, the pressure in the first channel 22 is greater than the pressure in the second channel 23. Since the spool 31 abuts against the valve port portion 40 on the side close to the second channel 23, the spool 31 cannot open the valve port 40a, so the fluid is cut off.

[0021] Reference Figures 2 - 4 The valve core 31 includes a first outer wall 311, a second outer wall 312 and a transition wall 313. Along the axial direction of the valve core 31, the transition wall 313 is located between the first outer wall 311 and the second outer wall 312, and the first outer wall 311 is closer to the valve port 40a than the second outer wall 312. The valve body 10 includes a first inner wall 1011a, and the wall forming the valve cavity 10a includes the first inner wall 1011a. At least part of the second outer wall 312 abuts against or has a clearance fit with the first inner wall 1011a. The second outer wall 312 and the first inner wall 1011a can slide and fit with each other, which can guide the action of the valve core 31 to switch the valve, which is beneficial to reduce the deflection of the valve core 31 and improve the sealing performance of the one-way valve 1.

[0022] The transition wall 313 along the axial direction of the valve core 31 is located between the first outer side wall 311 and the second outer side wall 312, and the diameter of the transition wall 313 gradually decreases in the direction from the second outer side wall 312 to the first outer side wall 311. There is a gap between the first inner side wall 1011a and the first outer side wall 311, that is, the first area 316. The one-way valve 1 includes a first state. When the one-way valve 1 works in the first state, the first area 316 is connected to the valve port 40a. The first area 316 is defined, and the first area 316 is located between the first inner side wall 1011a and the first outer side wall 311. The flow cross-sectional area of ​​the first area 316 is S1, and one of the flow cross-sections of the first area 316 is annular. The flow cross-sectional area of ​​the valve port 40a is S2, and S1≥S2. It should be noted that the cross-sectional area between the first inner wall 1011a and the second outer wall 311 may be constant or variable. When the cross-sectional area between the first inner wall 1011a and the second outer wall 311 changes, the minimum flow cross-sectional area shall prevail. The flow cross-sectional area of ​​the valve port 40a may also be variable. For example, if any part of the valve core 31 is located at the valve port 40a, the minimum flow cross-sectional area of ​​the valve port 40a shall prevail.

[0023] When the fluid is introduced through the second channel 23, the pressure difference between the second channel 23 and the valve cavity 10a causes the valve core 31 to open the valve port 40a. After the fluid passes through the valve port 40a, it can enter the first region 316 between the first inner wall 1011a and the first outer wall 311. Also, because S1≥S2, the flow area of the fluid increases after entering the first region 316, which is beneficial to reducing the pressure drop. Especially when the distance between the valve core 31 and the valve port part 40 is small, the fluid flows through the first region 316 from the valve port 40a, and the flow cross-sectional area between the first inner wall 1011a and the first outer wall 311 is larger than the flow cross-sectional area of the valve port 40a, which is beneficial to reducing the pressure drop of the fluid after it is led out from the valve port 40a, thereby reducing the pressure drop of the check valve 1. If the flow area of the first region 316 is smaller than the flow area of the valve port 40a, the pressure drop of the fluid is relatively large when it passes through the valve port 40a instantaneously. At this time, after the fluid passes through the valve port 40a, it is still in an environment with a smaller flow area, and the pressure drop cannot be significantly reduced, and the fluid impacts the inner wall of the valve cavity 10a, causing partial pressure loss. When the flow area of the first region 316 is larger than the flow area of the valve port 40a, the flow area increases after the fluid passes through the valve port 40a, which is beneficial to reducing the pressure drop.

[0024] Furthermore, at least a part of the first channel 22 is located on the side of the valve body 10. The check valve 1 includes a first state. In the first state, the valve port 40a can communicate with the first channel 22. Along the radial direction of the valve core 31, at least a part of the first outer wall 311 faces the first channel 22. Here, the first state refers to a process state in the movement stroke of the valve core 31, and the first state does not include the valve closing state. In the first state, at least a part of the first outer wall 311 of the valve core 31 faces the first channel 22, and at least a part of the first channel 22 is blocked by the valve core 31. After the fluid is led out from the valve port 40a, it enters the space between the first inner wall 1011a and the first outer wall 311 through the gap between the valve core 31 and the valve port part 40. The flow cross-sectional area between the first inner wall 1011a and the first outer wall 311 is larger than the flow cross-sectional area of the valve port 40a, which is beneficial to reducing the pressure drop of the fluid after it is led out from the valve port 40a, thereby reducing the pressure drop of the check valve 1.

[0025] Along the axial direction of the valve core 31, it is defined that at least part of the valve port 40a and the first channel 22 are at the same height position, or there is a spacing L1 between the valve port 40a and the first channel 22, and L1 ≤ 3 mm. The valve body 10 includes a first wall 103b. The one-way valve 1 includes a third state. In the third state, the first wall 103b abuts against the valve core 31. In this embodiment, the second channel 23 has an opening in the first wall 103b to form the valve port 40a. In the second state, the valve port 40a communicates with the valve cavity 10a. Optionally, the smaller the axial spacing between the first channel 22 and the valve port 40a, the better. However, in actual production, since the first channel 22 is provided on the side of the valve body 10 and the valve body 10 is made of metal, the first channel 22 can be formed by machining. The valve port 40a is close to the first channel 22, and the machining of the first channel 22 may cause damage to the valve port part 40. Therefore, L1 is preferably the minimum value that can be achieved in actual production.

[0026] The valve core 31 includes a guiding portion 315. At least part of the second outer side wall 312 is located on the guiding portion 315. Along the axial direction of the valve core 31, the first outer side wall 311 is relatively closer to the valve port 40a than the guiding portion 315. Along the axial direction of the valve core 31, the first outer side wall 311 of the guiding portion 315 is in sliding fit with the first inner side wall 1011a. The one-way valve 1 includes a second state. In the second state, the valve core 31 abuts against the valve port part 40. Along the axial direction of the valve core 31, the guiding portion 315 is relatively farther from the valve port 40a than the first channel 22. There is a gap, namely the first region, between the first outer side wall 311 of the valve core 31 and the first inner side wall 1011a of the valve body 10, facilitating the flow of fluid between this gap, the valve port 40a and the first channel 22. In the second state of the one-way valve 1, the valve core 31 abuts against the valve port part 40. Along the axial direction of the valve core 31, the guiding portion 315 is relatively farther from the valve port 40a than the first channel 22. Even in the small-flow valve-opening state, at this time, the guiding portion 315 moves in a direction farther from the valve port 40a based on its position in the second state, and the fluid can still be discharged through the first region 316 between the first outer side wall 311 and the first inner side wall 1011a, and the guiding portion 315 does not block the first channel 22, which is beneficial to reducing the pressure drop.

[0027] This structure is particularly suitable for small-flow environments. When a small amount of fluid passes through the valve port 40a, the spacing between the valve port part 40 and the valve core 31 is small in the height direction. There is a first gap between the first wall 103b and the valve core component 30. At least part of the valve port 40a and the first channel 22 are at the same height position or have a gap. Even when the opening of the valve port 40a is small, at least part of the first channel 22 is still opposite to the first channel 22 in the height direction, which is beneficial to reducing the fluid pressure loss and is also beneficial to reducing the pressure drop. In addition, the flow area of the first region 316 is larger than the flow area of the valve port 40a, which is beneficial to reducing the pressure loss caused by the fluid impacting the inner wall of the valve cavity 10a and is beneficial to reducing the pressure drop.

[0028] It should be noted that the clearance between the valve port 40a and the spool member 30 is located in the first height range, and the outlet is located in the second height range. The intersection of the first height range and the second height range in the height direction, where the height direction refers to the axial direction of the valve body 10, is only used to refer to the relative position and does not limit the specific structure. It should be noted that the valve body 10 here can be a cylinder or other irregular structures, but it does not affect the definition of the axial direction. The small flow rate environment here is used to illustrate the case where the clearance between the spool 31 and the valve port part 40 is small. Generally, the flow rate of small flow rate < 100 kg / h.

[0029] Define the flow cross-sectional area of the first channel 22 as S3, S3≥S2. After the fluid enters the valve cavity 10a, it is led out from the first channel 22. Since the flow cross-sectional area of the first channel 22 is greater than or equal to the flow cross-sectional area of the valve port 40a, it is convenient to reduce the pressure drop generated when the fluid is led out from the valve port 40a to the first channel 22. Optionally, when the flow cross-sectional area of the first channel 22 is greater than the flow cross-sectional area of the valve port 40a, the cross-sectional area of the fluid flowing after entering the first channel 22 from the valve port 40a increases, which is beneficial to further reducing the pressure drop. It should be noted that the flow cross-section here refers to the surface that intersects the wall of the channel accommodating the fluid with the surface perpendicular to the fluid flow direction as the reference in the fluid flow direction. In this embodiment, the flow cross-sectional areas of the first region 316, the valve port 40a, and the first channel 22 use the minimum flow cross-section allowed by each region for fluid passage as the reference object. In other embodiments, including but not limited to the above reference methods.

[0030] Furthermore, in the third state, the spool 31 abuts against the valve port part 40. Along the axial direction of the valve body 10, the second outer wall 312 is relatively far from the valve port 40a with respect to the wall defining the first channel 22, that is, along the axial direction of the spool 31, the second outer wall 312 and the wall of the first channel 22 are arranged in a dislocation manner. Also, since at least part of the second outer wall 312 is in contact or has a clearance fit with the first inner wall 1011a, the second outer wall 312 does not block the first channel 22. Even when opening the valve with a small flow rate, the fluid can be led out through the first region 316 between the first inner wall 1011a and the second outer wall 312, and the flow cross-sectional area of the first region 316 is greater than the flow cross-sectional area of the valve port 40a. Therefore, it is beneficial to reduce the pressure drop after the fluid enters the first region 316.

[0031] Refer to Figure 2 、 Figure 5 and Figure 6, the valve body 10 includes a first component 101 and a second component 102. The first component 101 and the second component 102 are fixedly connected. At least part of the first inner side wall 1011a is located in the second component 102. The one-way valve 1 includes a groove portion 1021 and a mating portion 1022. One of the groove portion 1021 and the mating portion 1022 is located in the first component 101, and the other of the groove portion 1021 and the mating portion 1022 is located in the second component 102. Along the radial direction of the valve body 10, the groove portion 1021 is recessed relative to the outer side wall of the valve body 10. The one-way valve 1 includes a wall portion 1011. When the one-way valve 1 is applied to the fluid control assembly 50, the fluid control assembly 50 includes a mounting portion 51. The wall portion 1011 can be connected to the mounting portion 51. The first component 101 is an integral structure. The first component 101 and the wall portion 1011 can be integrally formed by machining. In other embodiments, the first component 101 can also be formed by other forming methods. Further, the groove portion 1021 is annular. At least part of the mating portion 1022 is located in the groove formed by the groove portion 1021. Along the radial direction of the valve body 10, at least part of the mating portion 1022 and the groove portion 1021 are in transitional fit or interference fit to improve the coaxiality during the assembly of the first component 101 and the second component 102.

[0032] The groove portion 1021 includes a step stage 1021a, a transition section 1021b, and a guiding section 1021c. Along the axial direction of the valve body 10, the transition section 1021b is located between the step stage 1021a and the guiding section 1021c. At least part of the mating portion 1022 abuts against the step stage 1021a. At least part of the mating portion 1022 is in transitional fit or interference fit with the transition section 1021b. Along the radial direction of the valve body 10, there is a gap between the guiding section 1021c and the mating portion 1022. According to the positional relationship between the groove portion 1021 and the first component 101 and the second component 102, the guiding section 1021c extends to the end face of the first component 101 / the second component 102. The step stage 1021a abuts against the mating portion 1022 to limit the axial position of the first component 101 and the second component 102. The transition section 1021b connects the step stage 1021a and the guiding section 1021c. Along the radial direction of the valve body 10, the guiding section 1021c is closer to the axis of the valve core 31 relative to the transition section 1021b. The guiding section 1021c has an inclined surface connecting the transition section 1021b. Along the radial direction of the valve body 10, there is a gap between the guiding section 1021c and the mating portion 1022, so that the groove portion 1021 and the mating portion 1022 can be quickly assembled. Along the radial direction of the valve body 10, at least part of the mating portion 1022 is in transitional fit or interference fit with the transition section 1021b. The transition section 1021b and the mating portion 1022 can be installed by means such as press-fitting.

[0033] Due to the interference fit or press fit between the first component 101 and the second component 102, the first component 101 and the second component 102 can be assembled by press fitting. To improve reliability, the first component 101 and the second component 102 can be fixed by welding after assembly. The first component 101 is made of a metal material, and the second component 102 is made of a metal material. The materials of the first component 101 and the second component 102 are the same, which can improve the welding quality between the two. Optionally, the metal material can be one or a combination of aluminum alloy, stainless steel, copper, etc. In other embodiments, the first component 101 and the second component 102 include, but are not limited to, the above materials.

[0034] Referring to Figure 1 、 Figure 2 、 Figure 6 and Figure 7 ,the valve body 10 includes a first opening 20 and a second opening 21. The first opening 20 is located on the side wall of the first component 101 / the second component 102. The first opening 20 has two or more first openings 20a, and the first openings 20a communicate with the valve cavity 10a. The first openings 20a are arranged at intervals along the circumferential direction of the valve body 10. The one-way valve 1 has a first channel 22 and a second channel 23. At least part of the first channel 22 is located on the side of the first component 101 and / or the second component 102. The first channel 22 communicates with the valve cavity 10a, and the first opening 20a forms at least part of the first channel 22. The second opening 21 is located at at least one end of the valve body 10. The second opening 21 has a second opening 21a. At least part of the second channel 23 is located in the second component 102. At least part of the second opening 21a is located in the second channel 23. The second channel 23 communicates with the valve cavity 10a, and at least part of the valve port 40a is located in the second opening 21. In this embodiment, at least part of the first channel 22 is located on the side of the second component 102. In other embodiments, the first channel 22 can also be located in the first component 101.

[0035] In this embodiment, the wall portion 1011 is located on the first component 101, and the one-way valve 1 can be connected to the mounting portion 51 through the first component 101.

[0036] The valve body 10 includes a convex portion 103 and a bottom wall 103a. In this embodiment, the convex portion 103 and the bottom wall 103a are located on the second component 102. Along the axial direction of the valve body 10, the bottom wall 103a is located between the first opening 20 and the second opening 21. The wall forming the valve chamber 10a includes at least a part of the bottom wall 103a. Along the axial direction of the valve body 10, the convex portion 103 protrudes towards the spool 31 side relative to the bottom wall 103a. At least a part of the first wall 103b is located on the convex portion 103. The spool component 30 includes a seal 33. Along the axial direction of the valve body 10, the seal 33 can abut against the convex portion 103. At least a part of the valve port portion 40 is located on the convex portion 103. The abutment of the convex portion 103 and the seal 33 forms an end face seal, which is beneficial to providing a stable sealing method. The convex portion 103 is formed on the second component 102, and the second component 102 can be formed by machining. Compared with the general sealing structure, the processing difficulty of the end face seal is lower.

[0037] The one-way valve 1 includes a third state and a second state. In the third state, the spool 31 abuts against the valve port 40a of the valve port portion 40, the first channel 22 communicates with the valve chamber 10a, and the second channel 23 does not communicate with the valve chamber 10a, that is, the valve closing state. In the second state, compared with the third state, the spool 31 is farther away from the valve port 40a. The first channel 22 communicates with the valve chamber 10a, and the second channel 23 communicates with the valve chamber 10a, that is, the valve closing state.

[0038] Refer to Figure 2 and Figure 6 , the valve body 10 includes a top wall 1012b. The wall forming the valve chamber 10a includes the top wall 1012b. In the second state, the spool 31 abuts against the top wall 1012b. Along the axial direction of the spool 31, the first outer wall 311 is farther away from the valve port 40a relative to the first channel 22, or a part of the first outer wall 311 is opposite to the first channel 22. When a part of the first outer wall 311 is opposite to the first channel 22, it is defined that along the axial direction of the spool 31, the height dimension of the first outer wall 311 opposite to the first channel 22 is L2, and the dimension of the first channel 22 in the axial direction of the spool 31 is L0, and L2 ≤ 1 / 4 * L0. That is, in the second state, along the axial direction of the spool 31, at least a part of the first outer wall 311 is misaligned with the first channel 22, that is, not in the same height range, which is beneficial to reducing the blockage of the first outer wall 311 to the first channel 22. It should be noted that the second state here refers to the maximum valve opening state. In the maximum valve opening state, minimizing the blockage of the first channel 22 is beneficial to reducing the pressure drop. The dimension of the first channel 22 in the axial direction of the spool 31 refers to the inner wall dimension of the first channel 22 defined in the axial direction of the axis of the spool 31. When the first channel is a round hole, the axial dimension is the hole diameter.

[0039] The valve cavity 10a includes a first cavity 100b and a second cavity 100c. The first cavity 100b and the second cavity 100c are located on the opposite sides of the valve core 31. The second cavity 100c is closer to the valve port 40a than the first cavity 100b and is located on the side of the valve core 31 close to the valve port 40a. The wall defining the second cavity 100c includes a first wall 103b and a bottom wall 103a. As the valve core 31 moves, the volumes of the first cavity 100b and the second cavity 100c will change accordingly. The elastic member 32 is located in the first cavity.

[0040] The valve body 10 includes a convex portion 103 and a bottom wall 103a. The wall defining the valve cavity 10a includes at least a part of the bottom wall 103a. In this embodiment, the convex portion 103 and the bottom wall 103a are located on the second component 102. Along the axial direction of the valve body 10, the convex portion 103 protrudes towards the valve core 31 relative to the bottom wall 103a. The valve core component 30 includes a seal 33 and a limiting member 35. Along the axial direction of the valve body 10, the seal 33 can abut against the convex portion 103. At least a part of the valve port portion 40 is located on the convex portion 103. Along the axial direction of the valve core 31, one side of the seal 33 abuts against the valve core 31, and the other side abuts against the limiting member 35. The limiting member 35 is used to limit the seal 33. Since the seal 33 is located on the side of the valve core 31 close to the valve port 40a, the first outer sidewall 311 further includes the outer peripheral wall of the seal 33. Along the axial direction of the valve core 31, the first outer sidewall 311 is farther from the valve port 40a relative to the first channel 22, or a part of the first outer sidewall 311 is opposite to the first channel 22, which can reduce the shielding of the valve core component 30 from the first channel 22 and is beneficial to reducing the pressure drop of the check valve 1. In this embodiment, the valve core 33 has a convex portion, and at least a part of the seal 33 and the limiting member 35 are sleeved on the convex portion. The clearance between the central hole of the limiting member 35 and the valve core 31 can be 0.05 mm - 0.2 mm. By applying an axial downward pressure to the convex portion, the end of the convex portion is deformed, and then the radial dimension of the end of the convex portion is larger than the aperture of the central hole of the limiting member 35 to axially limit the seal 33 and the limiting member 35. The limiting member 35 can be a gasket.

[0041] The valve core 31 includes a receiving portion 314. In this embodiment, the receiving portion 314 is recessed relative to the top wall of the valve core 31 to form a cavity. The receiving portion 314 forms a part of the wall of the first cavity 100b, and at least a part of the elastic member 32 is located in the receiving portion 314. The check valve 1 has a balance hole 34. At least a part of the balance hole 34 is located in the valve core 31. One end of the balance hole 34 has an opening on the side wall of the valve core 31, and the other end of the balance hole 34 has an opening in the receiving portion 314. The balance hole 34 can communicate the first cavity 100b and the second cavity 100c to balance the pressures in the first cavity 100b and the second cavity 100c. It should be noted that the pressure balance here does not mean the same pressure. The setting of the balance hole 34 is aimed at reducing the pressure difference between the first cavity 100b and the second cavity 100c.

[0042] The present application also discloses a fluid control component 50. Referring to Figures 8 - 10 , the mounting portion 51 and the above-mentioned one-way valve 1 are provided. The mounting portion 51 has a mounting cavity 51a and a fluid passage 51b. At least a part of the one-way valve 1 is located in the mounting cavity 51a, and the valve body 10 can be connected to the mounting portion 51. Specifically, the first component 101 and / or the second component 102 can be fixedly connected to the mounting portion 51. The one-way valve 1 has a first passage 22 and a second passage 23. At least a part of the first opening 20a is located in the first passage 22, and at least a part of the second opening 21a is located in the second passage 23. The wall portion 1011 of the first component 101 is threadedly connected to and / or press-fitted and fixed to the mounting portion 51. The connection manner between the wall portion 1011 and the mounting portion 51 can be threaded connection, can be press-fitting and fixing, or can be a combination of threading and press-fitting. In other embodiments, it includes but is not limited to the above connection manners.

[0043] At least a part of the first passage 22 is located at the side of the first component 101 and / or the second component 102. A part of the fluid passage 51b communicates with the first passage 22. At least a part of the second passage 23 is located in the second component 102, and another part of the fluid passage 51b communicates with the second passage 23. In the present embodiment, the first passage 22 is located in the second component 102. The first component 101 is an integral structure, and the second component 102 is an integral structure. In other embodiments, the first passage 22 can also be located in the first component 101, or be located in both the first component 101 and the second component 102, and no specific limitation is made here.

[0044] The fluid control component 50 further includes a sealing portion 52, a first press-fitting wall 53, and a second press-fitting wall 54. The first press-fitting wall 53 is located in the first component 101. The wall portion 1011 includes a connecting portion 1011b. Along the radial direction of the valve body 10, the first press-fitting wall 53 is farther from the valve port 40a than the connecting portion 1011b of the wall portion 1011. The first press-fitting wall 53, the top wall 1012b, and the wall portion 1011 are an integral structure, and the connecting portion 1011b of the wall portion 1011 is fixedly connected to the mounting portion 51. When the first press-fitting wall 53 and the wall portion 1011 are of a split structure, since the sealing portion 52 is located between the first press-fitting wall 53 and the second press-fitting wall 54, the sealing portion 52 has a force on the first press-fitting wall 53 of the valve body 10 on the side away from 40a, and the wall portion 1011 is fixedly connected to the mounting portion 51, so that the force applied to the valve body 10 exerts two opposite forces on the split structure, and fluid is likely to leak from between the split structures. Therefore, the integral structure of the first press-fitting wall 53 and the wall portion 1011 can reduce leakage.

[0045] In some embodiments, the connecting portion 1011b may be a threaded portion, and the wall portion 1011 is threadedly connected to the mounting portion 51 through the threaded portion. The threads of the connecting portion 1011b and the mounting portion 51 cooperate with each other, and the first component 101 can be axially limited, so that the sealing portion 52 fits more tightly with the first press-fitting wall 53 and the second press-fitting wall 54. Compared with the first press-fitting wall 53 and the wall portion 1011 being a split structure, the first press-fitting wall 53 and the wall portion 1011 are an integral structure, and there is no fitting gap between them, which is beneficial to reducing leakage.

[0046] The wall forming the mounting cavity 51a includes the second press-fitting wall 54. Along the axial direction of the one-way valve 1, at least a part of the sealing portion 52 is located between the first press-fitting wall 53 and the second press-fitting wall 54, and the sealing portion 52 is relatively far from the valve port 40a with respect to the connecting portion 1011b. The sealing portion 52 is used to reduce the leakage of fluid from the mounting gap between the one-way valve 1 and the mounting portion 51. The sealing portion 52 includes at least two first abutting portions 52a and at least two second abutting portions 52b. Along the axial direction of the valve body 10, the first abutting portions 52a and the second abutting portions 52b are located on the opposite sides of the sealing portion 52, and the first abutting portions 52a abut against the first press-fitting wall 53, and the second abutting portions 52b abut against the second press-fitting wall 54. One side of the sealing portion 52 abuts against the first press-fitting wall 53 through a plurality of first abutting portions 52a, and the other side of the sealing portion 52 abuts against the second press-fitting wall 54 through the second abutting portions 52b, forming multi-point sealing, which is beneficial to reducing leakage. As shown in the figure, the sealing portion 52 can be Z-shaped or other structures, as long as the effect of multi-point sealing can be achieved. Especially in the field of high-pressure fluid control such as CO2, it has high sealing performance.

[0047] Along the axial direction of the valve body 10, the first channel 22 is relatively far from the sealing portion 52 with respect to the connecting portion 1011b, and along the axial direction of the valve body 10, the second channel 23 is relatively far from the sealing portion 52 with respect to the connecting portion 1011b. The connecting portion 1011b of the valve body 10 is fixed to the mounting portion 51. The fluid leakage in the mounting cavity 51a needs to pass through the connection part between the connecting portion 1011b and the mounting portion 51, and then through the gap between the sealing portion 52 and the first press-fitting wall 53 and / or the second press-fitting wall 54. The connection part can play a role in partially reducing leakage. The first channel 22 and the second channel 23 are relatively far from the sealing portion 52 with respect to the connecting portion 1011b, and the sealing portion 52 can further reduce the external leakage of fluid.

[0048] The sealing portion 52 is made of a metal material, the mounting portion 51 is made of a metal material, the first component 101 is made of a metal material, and the first press-fitting wall 53 of the first component 101 and the connecting portion 1011b of the first component 101 are an integral structure. The sealing portion 52 can be formed by machining. Selecting high-strength materials in the field of high-pressure fluid control is beneficial to improving the sealing effect and extending the service life of the sealing portion 52.

[0049] The first component 101 of the one-way valve 1 is threadedly connected or press-fitted and fixed to the mounting portion 51, and the leakage is reduced through the sealing portion 52, which is beneficial to the rapid assembly of the fluid control assembly 50. When the first component 101 and the mounting portion 51 are connected, the sealing portion 52 can be pressed tightly, which is beneficial to reducing the leakage of the one-way valve 1. Only the first press-fitting wall 53 located on the first component 101 is shown in the drawings, and it actually includes but is not limited to this structure.

[0050] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present invention or make equivalent substitutions, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. A check valve (1), characterized in that: it includes a valve body (10) and a valve core component (30), the check valve (1) has a valve cavity (10a), at least part of the valve core component (30) is located in the valve cavity (10a), the valve core component (30) includes a valve core (31), the check valve (1) includes a valve port part (40), along the axial direction of the valve core (31), the valve core (31) can act to close the valve port (40a) of the valve port part (40); the valve body (10) includes a first inner side wall (1011a), the wall forming the valve cavity (10a) includes the first inner side wall (1011a), the valve core (31) includes a first outer side wall (311), defining a first region (316), along the radial direction of the valve core (31), the first region (316) is located between the first inner side wall (1011a) and the first outer side wall (311), the check valve (1) includes a first state, when the check valve (1) works in the first state, the first region (316) communicates with the valve port (40a), the flow cross-sectional area of the first region (316) is S1, defining the flow cross-section of the valve port (40a) as S2, S1≥S2.

2. The check valve (1) according to claim 1, characterized in that: the check valve (1) has a first channel (22), at least part of the first channel (22) is located on the side of the valve body (10), in the first state, the first region (316) communicates with the valve port (40a) and the first channel (22), along the radial direction of the valve core (31), at least part of the first outer side wall (311) is opposite to the first channel (22).

3. The check valve (1) according to claim 1 or 2, characterized in that: the check valve (1) has a first channel (22), at least part of the first channel (22) is located on the side of the valve body (10), the first channel (22) communicates with the valve cavity (10a), defining the flow cross-sectional area of the first channel (22) as S3, S3≥S2.

4. The check valve (1) according to claim 3, characterized in that: along the axial direction of the valve core (31), at least part of the valve port (40a) and the first channel (22) are at the same height position, or there is a distance L1 between the valve port (40a) and the first channel (22), L1≤3mm.

5. The check valve (1) according to any one of claims 1-4, characterized in that: The valve body (10) includes a top wall (1012b), and the wall forming the valve chamber (10a) includes the top wall (1012b). The one-way valve (1) includes a second state, in which the valve core (31) abuts against the top wall (1012b). The one-way valve (1) has a first channel (22), and at least part of the first channel (22) is located on the side of the valve body (10). Along the axial direction of the valve core (31), the first outer wall (311) is farther from the valve port (40a) relative to the first channel (22), or a part of the first outer wall (311) faces the first channel (22). When a part of the first outer wall (311) faces the first channel (22), a height dimension L2 is defined along the axial direction of the valve core (31), where the first outer wall (311) faces the first channel (22), and the dimension of the first channel (22) in the axial direction of the valve core (31) is L0, and L2 ≤ 1 / 4 * L0.

6. The one-way valve (1) according to claim 5, characterized in that: The one-way valve (1) includes a third state, in which the valve core (31) abuts against the valve port part (40). The valve chamber (10a) includes a first chamber (100b) and a second chamber (100c). The first chamber (100b) and the second chamber (100c) are located on the opposite sides of the valve core (31). The second chamber (100c) is located on the side of the valve core (31) close to the valve port (40a). The one-way valve (1) includes an elastic member (32), and the elastic member (32) is located in the first chamber (100b). One end of the elastic member (32) abuts against the valve core (31), and the other end of the elastic member (32) abuts against the top wall (1012b). The elastic member (32) can apply a valve closing force to the valve core (31).

7. The one-way valve (1) according to claim 6, characterized in that: The one-way valve (1) has a balance hole (34), and at least part of the balance hole (34) is located in the valve core (31). The balance hole (34) can communicate the first chamber (100b) and the second chamber (100c).

8. The one-way valve (1) according to claim 7, characterized in that: The valve body (10) includes a protrusion (103) and a bottom wall (103a), and the wall defining the valve chamber (10a) includes at least part of the bottom wall (103a). Along the axial direction of the valve body (10), the protrusion (103) protrudes towards the valve core (31) relative to the bottom wall (103a). The valve core component (30) includes a seal (33), and the seal (33) is connected to the valve core (31). Along the axial direction of the valve body (10), the seal (33) can abut against the protrusion (103), and at least part of the valve port part (40) is located on the protrusion (103).

9. The one-way valve (1) according to claim 8, characterized in that: The valve body (10) includes a first component (101) and a second component (102). The one-way valve (1) includes a groove portion (1021) and a mating portion (1022). One of the groove portion (1021) and the mating portion (1022) is located on the first component (101), and the other of the groove portion (1021) and the mating portion (1022) is located on the second component (102). The groove portion (1021) and the mating portion (1022) are press-fitted and fixed.

10. The one-way valve (1) according to claim 9, characterized in that: The groove portion (1021) includes a stepped stage (1021a), a transition section (1021b), and a guiding section (1021c). Along the axial direction of the valve body (10), the transition section (1021b) is located between the stepped stage (1021a) and the guiding section (1021c). At least part of the mating portion (1022) abuts against the stepped stage (1021a), and at least part of the mating portion (1022) is in transitional fit or interference fit with the transition section (1021b). Along the radial direction of the valve body (10), there is a gap between the guiding section (1021c) and the mating portion (1022). According to the positional relationship between the groove portion (1021) and the first component (101) and the second component (102), the guiding section (1021c) extends to the end face of the first component (101) / the second component (102).

11. A fluid control assembly (50), characterized in that: It includes an installation portion (51) and the one-way valve (1) according to any one of claims 1-10. The installation portion (51) has an installation cavity (51a) and a fluid passage (51b). At least part of the one-way valve (1) is located in the installation cavity (51a). The valve body (10) can be connected to the installation portion (51). The one-way valve (1) has a first passage (22) and a second passage (23). A part of the fluid passage (51b) is in communication with the first passage (22), and another part of the fluid passage (51b) is in communication with the second passage (23).

12. The fluid control assembly (50) according to claim 11, characterized in that: The fluid control assembly (50) further includes a sealing portion (52), a first press-fitting wall (53), and a second press-fitting wall (54). The one-way valve (1) includes a wall portion (1011). The wall portion (1011) can be connected to the installation portion. The first press-fitting wall (53) and the wall portion (1011) are of an integral structure. The wall forming the installation cavity (51a) includes the second press-fitting wall (54). Along the axial direction of the one-way valve (1), at least part of the sealing portion (52) is located between the first press-fitting wall (53) and the second press-fitting wall (54). The sealing portion (52) is relatively far from the valve port (40a) with respect to the connecting portion (1011b).

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