One-way valve

Abstract

The utility model provides a one-way valve which comprises a valve seat and a guide sleeve located at one end of the valve seat, the valve seat is provided with a valve seat through hole penetrating through the two ends of the valve seat in the axial direction of the valve seat, the guide sleeve is provided with a guide cavity, the cavity wall of the guide cavity is provided with a circulation structure, and the one-way valve further comprises a spherical valve element located in the guide cavity and provided with a conduction position and a cut-off position. When the spherical valve element is located at the conduction position, fluid can circulate between the valve seat through hole and the circulation structure, when the spherical valve element is located at the cut-off position, the spherical valve element blocks an opening of the valve seat through hole, the spherical valve element can move in the axial direction of the valve seat through hole under the action of the pressure difference between the two sides of the spherical valve element, and in the using process of the one-way valve, the fluid can flow through the circulation structure. The value of a gap between the spherical valve element and the guide cavity is A, and A is not smaller than 10% of the diameter of the spherical valve element. According to the utility model, the probability that the valve core is stuck due to the size deviation of the guide sleeve after expansion caused by heat and contraction caused by cold can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid flow direction switching valve design, in particular to a one-way valve. Background Art

[0002] The patent document with application number 202311800492 discloses a one-way valve, which has a metal valve core with a cup-shaped hollow structure. In a specific application process, the one-way valve and other pipelines form an initial integral pipe assembly. After the integral pipe assembly is brazed in a high-temperature brazing furnace above 700°C, the pipe body, valve seat, metal valve core with a cup-shaped hollow structure and a guide sleeve will all expand and contract due to heat. Since the shape of the metal valve core is a cup-shaped thin-walled structure, during the high-temperature brazing process and after cooling to room temperature, its deformation in various dimensional directions is uneven, resulting in abnormal deformation of related components after brazing. Some components, especially the cup-shaped metal valve core, cannot be restored to the designed size at room temperature, resulting in a size mismatch between the valve core and the guide sleeve, which in turn causes the valve core to become stuck from time to time. In order to overcome the aforementioned deficiencies in the prior art, the present utility model is proposed. Utility Model Content

[0003] The one-way valve designed in the present invention can at least partially solve the above problems.

[0004] The utility model aims to provide a one-way valve, comprising a valve seat and a guide sleeve at one end of the valve seat, the valve seat having a valve seat through hole extending axially through both ends thereof, the guide sleeve having a guide cavity, the cavity wall of the guide cavity having a flow structure, and also comprising a spherical valve core, the spherical valve core being in the guide cavity and having a conducting position and a cut-off position, when the spherical valve core is in the conducting position, the fluid can flow between the valve seat through hole and the flow structure, when the spherical valve core is in the cut-off position, the spherical valve core blocks the orifice of the valve seat through hole, the spherical valve core can move axially along the valve seat through hole under the action of the pressure difference on both sides thereof, and during the use of the one-way valve, the gap value between the spherical valve core and the guide cavity is A, and A is not less than 10% of the diameter of the spherical valve core.

[0005] In some embodiments, A is not greater than 40% of the diameter of the spherical valve core; and / or the spherical valve core is a hollow ball.

[0006] In some embodiments, the valve seat, the guide sleeve, and the spherical valve core are made of the same material, which is stainless steel.

[0007] In some embodiments, the opening at one end of the valve seat through hole close to the guide sleeve is in the shape of a truncated cone, and the large base of the truncated cone is close to the guide sleeve, the height of the truncated cone is H, and the wall thickness of the valve seat corresponding to the truncated cone at the minimum wall thickness is L, 0.8≦H / L≦1.2 and L≥1.5mm.

[0008] In some embodiments, the flow structure includes a flow hole, which extends radially along the guide sleeve and passes through the inner and outer sides of the guide cavity; or, the flow structure includes a flow groove, which extends radially along the guide sleeve and passes through the inner and outer sides of the guide cavity and extends axially along the guide sleeve and passes through one end of the guide cavity away from the valve seat.

[0009] In some embodiments, the flow equivalent area of ​​the flow hole or the flow groove is not less than the flow area of ​​the valve seat through hole.

[0010] In some embodiments, the guide cavity is formed with a blocking hole coaxial with the valve seat through hole at a free end away from the valve seat, and a diameter of the blocking hole is smaller than a diameter of the spherical valve core.

[0011] In some embodiments, a blocking rod is further provided on a side of the blocking hole close to the valve seat, and a gap is provided between the blocking rod and the blocking hole.

[0012] In some embodiments, a plurality of annular grooves are provided on the outer circumferential wall of the valve seat, and each of the annular grooves is used to accommodate welding material.

[0013] In some embodiments, an end of the valve seat close to the guide sleeve is provided with an outer peripheral step, and / or an end of the valve seat away from the guide sleeve is provided with an inner peripheral step.

[0014] The one-way valve of the utility model:

[0015] A spherical valve core is used as a one-way valve. During the thermal expansion and contraction process, the spherical valve core has a more uniform deformation and a smaller structural stress. Therefore, when it returns to room temperature after high-temperature brazing, it can basically return to its original structural size and the deformation can be almost completely ignored. By setting the gap value A between the spherical valve core and the guide cavity to not less than 10% of the diameter of the spherical valve core, the probability of the valve core getting stuck caused by the dimensional deviation of the guide sleeve after thermal expansion and contraction can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of a one-way valve of an embodiment of the utility model, in which the spherical valve core is in a cut-off position.

[0017] Figure 2 yes Figure 1Schematic diagram of the state when the spherical valve core in the one-way valve is in the conducting position.

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure in which the middle one-way valve is assembled in the outer tube body.

[0019] Figure 4 It is a schematic structural diagram of the one-way valve and the outer tube body after being assembled in another embodiment of the utility model.

[0020] Figure 5 It is a cross-sectional view of a one-way valve in another embodiment of the utility model.

[0021] Figure 6 yes Figure 5 Schematic diagram of the internal structure of the one-way valve when the guide sleeve is assembled in a split manner.

[0022] Figure 7 It is a schematic structural diagram of the one-way valve and the outer tube body after being assembled in another embodiment of the utility model.

[0023] In the figure:

[0024] 1. Valve seat; 11. Valve seat through hole; 12. Annular groove; 13. Outer peripheral step; 14. Inner peripheral step; 2. Guide sleeve; 21. Guide cavity; 22. Blocking hole; 3. Spherical valve core; 41. Flow hole; 42. Flow groove; 5. Blocking rod; 6. Outer tube body. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed description will be omitted.

[0026] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0027] The following example is a one-way valve of the utility model. This example is only a part of the embodiments of the utility model, but the protection scope of the utility model is not limited to this. All other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the utility model.

[0028] Please refer to Figures 1 to 7 According to an embodiment of the utility model, a one-way valve is provided, comprising a valve seat 1 and a guide sleeve 2 at one end of the valve seat 1, wherein the valve seat 1 has a valve seat through hole 11 extending through both ends thereof along its axial direction, the guide sleeve 2 has a guide cavity 21, and a flow structure is provided on the cavity wall of the guide cavity 21, and further comprising a spherical valve core 3, wherein the spherical valve core 3 is in the guide cavity 21 and has a conducting position and a cut-off position, wherein when the spherical valve core 3 is in the conducting position, the fluid can flow between the valve seat through hole 11 and the flow structure, and when the spherical valve core 3 is in the cut-off position When the one-way valve is in use, the spherical valve core 3 blocks the orifice of the valve seat through hole 11, and the spherical valve core 3 can move axially along the valve seat through hole 11 under the action of the pressure difference on both sides thereof to realize the switching of the spherical valve core 3 between the conduction position and the cut-off position. During the use of the one-way valve, the gap value between the spherical valve core 3 and the guide cavity 21 is A, and A is not less than 10% of the diameter of the spherical valve core 3. For example, when the diameter of the spherical valve core 3 is 10 mm, the minimum value of the aforementioned A, that is, the gap between the spherical valve core 3 and the guide cavity 21, is 1 mm, that is, the unilateral gap is 0.5 mm.

[0029] In this technical solution, a spherical valve core 3 is used as a one-way valve. During the process of thermal expansion and contraction, the spherical valve core has a more uniform deformation and a smaller structural stress. In this way, when it returns to room temperature (generally 10°C to 30°C) after high-temperature (above 700°C) brazing, it can basically return to the original structural size (i.e., the design size), and the deformation can be almost completely ignored. The gap value A between the spherical valve core 3 and the guide cavity 21 is set to be not less than 10% of the diameter of the spherical valve core 3, which can reduce the probability of the valve core being stuck due to the dimensional deviation of the guide sleeve 2 after thermal expansion and contraction. It should be noted that after a large number of experiments and probability calculation studies by the inventor, the aforementioned A is greater than or equal to 10% of the spherical diameter, which can ensure that the probability of the steel ball not being stuck is more than 99.999%, which is equivalent to completely eliminating the occurrence of the valve core stuck phenomenon.

[0030] In some embodiments, A is not greater than 40% of the diameter of the spherical valve core 3. For example, if the diameter of the spherical valve core 3 is 10 mm, the maximum value of A between the spherical valve core 3 and the guide sleeve 2 is 4 mm, that is, the single-side gap is 2 mm. In this technical solution, the upper limit of the aforementioned gap value A is limited, which can prevent the occurrence of refrigerant leakage when the spherical valve core 3 is too small in the cut-off position.

[0031] In a preferred embodiment, the spherical valve core 3 is a hollow ball, which can significantly reduce the mass of the valve core and reduce the opening pressure difference of the one-way valve.

[0032] In some embodiments, the valve seat 1, the guide sleeve 2 and the spherical valve core 3 are made of the same material, and are all stainless steel. As a preferred embodiment, all components are made of the same grade of stainless steel, such as SUS304 or SUS303. When the one-way valve needs to be welded to the corresponding outer tube 6, the material of the outer tube 6 is also the same as that of the components in the one-way valve. In this technical solution, the same material stainless steel is used, which can have a more consistent thermal deformation, thereby minimizing the dimensional deviation caused by thermal expansion and contraction.

[0033] See Figure 1 As shown, in some embodiments, the opening of one end of the valve seat through hole 11 close to the guide sleeve 2 is in the shape of a truncated cone, and the large base of the truncated cone is close to the guide sleeve 2, the height of the truncated cone is H, and the wall thickness of the minimum wall thickness of the valve seat 1 corresponding to the truncated cone is L, 0.8≦H / L≦1.2 and L≥1.5mm, that is, the axial and radial dimensions of the conical portion of the valve seat 1 are basically equal, the structural stress is small, and after being brazed in a high-temperature furnace above 700°C, the original structural dimensions are basically restored, and the deformation (that is, the deviation of the design dimensions at room temperature) can be ignored.

[0034] In some embodiments, see Figures 1 to 4 As shown, the flow structure includes a flow hole 41, and the flow hole 41 extends along the radial direction of the guide sleeve 2 and penetrates the inner and outer sides of the guide cavity 21. It can be understood that in this case, when the one-way valve is assembled with the outer tube body 6, a certain distance should be maintained between the inner wall surface of the outer tube body 6 and the guide sleeve 2, thereby forming an annular flow gap, such as Figure 3 and Figure 4 shown; or, see Figures 5 to 7 As shown, the circulation structure includes a circulation groove 42, and the circulation groove 42 extends along the radial direction of the guide sleeve 2 to pass through the inner and outer sides of the guide cavity 21 and extends along the axial direction of the guide sleeve 2 to pass through the end of the guide cavity 21 away from the valve seat 1. In this case, there is no need to retain the aforementioned annular circulation gap between the guide sleeve 2 and the outer tube body 6. The circulation requirements can be met by the aforementioned circulation groove 42, and the structure is more compact and the flow resistance is smaller.

[0035] In some embodiments, the flow equivalent area of ​​the flow hole 41 or the flow groove 42 is not less than the flow area of ​​the valve seat through hole 11 to minimize the flow resistance of the refrigerant.

[0036] In some embodiments, the guide cavity 21 is formed with a blocking hole 22 coaxial with the valve seat through hole 11 away from the free end of the valve seat 1, and the diameter of the blocking hole 22 is smaller than the diameter of the spherical valve core 3. Figure 1 As shown, the aforementioned blocking hole 22 can be formed by shrinking the free end of the guide sleeve 2, thereby preventing the spherical valve core 3 from escaping from the guide cavity 21. The free end of the guide sleeve 2 can also be machined to form a step or install a blocking ring.

[0037] In a preferred embodiment, Figure 5 As shown, a blocking rod 5 is further provided on the side of the blocking hole 22 close to the valve seat 1, and there is a gap between the blocking rod 5 and the blocking hole 22. The existence of the gap allows a flow gap to be formed between the spherical valve core 3 and the aforementioned blocking hole 22, which can further increase the flow area of ​​the refrigerant and reduce the flow resistance.

[0038] The outer circumferential wall of the valve seat 1 is provided with a plurality of annular grooves 12, each of which is used to accommodate solder (e.g., lead solder). In specific applications, the outer tube body 6 is mounted on the outer side wall of the valve seat 1, and a seal is formed on the opening side of each annular groove 12. In this way, after the one-way valve is assembled in the outer tube body 6, a seal is formed between the inner wall of the outer tube body 6 and the outer periphery of the valve seat 1 with lead solder. Only one circle of rolling is required, and the sealing between the valve seat 1 and the spherical valve core 3 can be tested. After delivery, the pipe group enters the brazing furnace for further welding to strengthen the seal.

[0039] In some embodiments, the valve seat 1 is provided with an outer peripheral step 13 at one end close to the guide sleeve 2, and / or, the valve seat 1 is provided with an inner peripheral step 14 at one end away from the guide sleeve 2, and the outer tube body 6 can be reliably welded to the valve seat 1 through the aforementioned outer peripheral step 13 and / or inner peripheral step 14.

[0040] The guide sleeve 2 can be integrally formed with the valve seat 1, or assembled in a separate structure, such as Figure 6 The aforementioned flow structure may be multiple, and the multiple flow structures are arranged at intervals in the circumferential direction of the guide sleeve 2.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-way valve, characterized in that: The invention comprises a valve seat (1) and a guide sleeve (2) located at one end of the valve seat (1), wherein the valve seat (1) has a valve seat through hole (11) extending through both ends of the valve seat along its axial direction, the guide sleeve (2) has a guide cavity (21), the cavity wall of the guide cavity (21) has a flow structure, and further comprises a spherical valve core (3), wherein the spherical valve core (3) is located in the guide cavity (21) and has a conducting position and a cut-off position, and when the spherical valve core (3) is in the conducting position, the fluid can The one-way valve is circulated between the valve seat through hole (11) and the circulation structure. When the spherical valve core (3) is in the cut-off position, the spherical valve core (3) blocks the orifice of the valve seat through hole (11). The spherical valve core (3) can move axially along the valve seat through hole (11) under the action of the pressure difference on both sides thereof. During the use of the one-way valve, the clearance value between the spherical valve core (3) and the guide cavity (21) is A, and A is not less than 10% of the diameter of the spherical valve core (3).

2. The one-way valve according to claim 1, characterized in that: A is not greater than 40% of the diameter of the spherical valve core (3); and / or the spherical valve core (3) is a hollow ball.

3. The one-way valve according to claim 1 or 2, characterized in that: The valve seat (1), the guide sleeve (2) and the spherical valve core (3) are made of the same material, which is stainless steel.

4. The one-way valve according to claim 1, characterized in that: The opening of one end of the valve seat through hole (11) close to the guide sleeve (2) is in the shape of a truncated cone, and the large base of the truncated cone is close to the guide sleeve (2). The height of the truncated cone is H, and the wall thickness of the valve seat (1) corresponding to the truncated cone at the minimum wall thickness is L, 0.8≦H / L≦1.2 and L≥1.5mm.

5. The one-way valve according to claim 1, characterized in that: The circulation structure comprises a circulation hole (41), and the circulation hole (41) extends along the radial direction of the guide sleeve (2) to pass through the inner and outer sides of the guide cavity (21); or, the circulation structure comprises a circulation groove (42), and the circulation groove (42) extends along the radial direction of the guide sleeve (2) to pass through the inner and outer sides of the guide cavity (21) and extends along the axial direction of the guide sleeve (2) to pass through one end of the guide cavity (21) away from the valve seat (1).

6. The one-way valve according to claim 5, characterized in that: The flow equivalent area of ​​the flow hole (41) or the flow groove (42) is not less than the flow area of ​​the valve seat through hole (11).

7. The one-way valve according to claim 1, characterized in that: The guide cavity (21) is formed with a blocking hole (22) coaxial with the valve seat through hole (11) at a free end away from the valve seat (1), and the diameter of the blocking hole (22) is smaller than the diameter of the spherical valve core (3).

8. The one-way valve according to claim 7, characterized in that: A blocking rod (5) is also provided on a side of the blocking hole (22) close to the valve seat (1), and a gap is provided between the blocking rod (5) and the blocking hole (22).

9. The one-way valve according to claim 1, characterized in that: A plurality of annular grooves (12) are provided on the outer circumferential wall of the valve seat (1), and each of the annular grooves (12) is used to accommodate welding material.

10. The one-way valve according to claim 1, characterized in that: An outer peripheral step (13) is provided at one end of the valve seat (1) close to the guide sleeve (2), and / or an inner peripheral step (14) is provided at one end of the valve seat (1) away from the guide sleeve (2).

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