One-way valve

Abstract

The invention provides a one-way valve, and belongs to the technical field of machinery. The problem that the cost is high due to the fact that the structural stability is guaranteed is solved. The one-way valve comprises a valve body, a valve element, a spring and a supporting seat, the valve element, the spring and the supporting seat are sequentially arranged in the valve body from front to back, the valve element can slide front and back in the valve body, a plurality of flow guide grooves are formed in the side portion of the valve element in the circumferential direction, the supporting seat is formed by a round metal sheet body extending outwards on the circumference to form a plurality of supporting feet, and each supporting foot is in a long-strip-shaped sheet shape. The supporting legs are bent backwards to enable the whole supporting seat to be in a conical shape, a flow guide opening is formed between every two adjacent supporting legs, the spring abuts against the position between the valve element and the round metal sheet body, the supporting seat is located in the valve body in the radial direction through the supporting legs, and an annular blocking part is fixedly or integrally arranged behind the supporting seat in the valve body. The supporting legs abut against the blocking parts. The device has the advantages of low cost, good structural stability and the like.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a one-way valve. Background Art

[0002] A one-way valve, also known as a check valve or non-return valve, is used in hydraulic systems to prevent reverse flow of oil, or in pneumatic systems to prevent reverse flow of compressed air. For example, patent application number 202122081784.3 discloses a one-way valve comprising a valve body, a piston, and a valve seat. The valve body is provided with an air inlet and a through hole coaxially extending therefrom. The through hole has a conical surface at one end near the air inlet, a piston is positioned within the through hole, and a valve seat is positioned at the outer end of the through hole. The piston is stepped and comprises a cone that mates with the conical surface and a column that mates with the through hole. The column is provided with a guide groove at the outer edge of the column, and there are at least two evenly distributed guide grooves. The valve seat comprises a valve stem and a coaxially arranged stepped outlet. The valve stem also has a manifold that extends through the outlet, located at the end of the valve stem near the piston. There are at least two evenly distributed manifolds, and the axis of the manifold forms an acute angle with the axis of the outlet. An elastic element for resetting the piston is positioned between the piston and the valve seat. Gas enters the valve body through the inlet, dislodging the piston. The piston moves rightward, opening the air path. The gas then passes through the guide grooves on the column, the manifold holes on the valve seat, and the outlet holes before exiting the one-way valve and entering the high-pressure air pipe. When the inlet stops, the high-pressure gas in the valve seat flows back. This backflow pushes the piston leftward, against the inner wall of the valve body, and prevents the return of high-pressure gas. The guide grooves help straighten the piston, reducing friction with the inner wall of the valve body.

[0003] Under high-pressure fluid pressure, the piston will overcome the elastic force of the elastic element and be directly pressed into a state of abutment against the end of the valve seat. In other words, the pressure of the high-pressure fluid will be applied to the valve seat through the piston. Combined with the drawings in the specification, it can be seen that the valve seat is designed to be roughly cylindrical and threaded into the valve body. A valve seat of this shape can well ensure the structural stability of the one-way valve under high-pressure fluid pressure, but at the same time, a valve seat of this shape will relatively increase the cost of the entire one-way valve. Since the collecting holes used on the valve seat are inclined holes and the number of collecting holes is multiple, the entire valve seat must have a sufficient number of solid parts along the radial direction. Since the valve seat is threaded with the valve body, the volume of the valve body must also be increased accordingly, which will also increase the cost. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a one-way valve to solve the problem of high cost caused by ensuring structural stability.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A one-way valve comprises a valve body and a valve core, a spring and a support seat arranged in the valve body from front to back in sequence, the valve core being able to slide back and forth in the valve body, and a plurality of guide grooves being provided on the side of the valve core along the circumference, characterized in that the support seat is composed of a circular metal sheet body extending outward on its circumference to form a plurality of support feet, each support foot being in the form of a long strip of sheet, each support foot being bent backward to make the support seat as a whole conical, and a guide port being formed between two adjacent support feet, the spring resting between the valve core and the circular metal sheet body, the support seat being radially positioned in the valve body by the support feet, and an annular blocking portion being fixed or integrally provided behind the support seat in the valve body, and each support foot resting on the blocking portion.

[0007] After high-pressure fluid enters the valve body, the fluid pressure pushes the valve core to overcome the action of the spring and move backward. The valve core is pressed to the rear end and abuts against the circular metal sheet of the support seat. At this time, the one-way valve is opened, allowing the fluid to move backward through the guide groove on the side of the valve core. Since the support seat is composed of a circular metal sheet body extending outward from its circumference to form a plurality of support legs, each support leg is bent backward to give the support seat an overall conical shape. The support seat is radially disposed within the valve body through each support leg. Therefore, after the support seat is installed in the valve body, an annular gap is formed between its outer circumference (i.e., the portion formed by each support leg) and the inner wall of the valve body, which gradually decreases from front to back. In this way, after the rear end of the valve core abuts against the support seat, the guide groove on the side of the valve core will be connected to the gap formed between the outer circumference of the support seat and the inner wall of the valve body, and a guide port is formed between the two adjacent support legs. In other words, after flowing out of the guide groove, the fluid will directly enter the above-mentioned gap and flow backward through the guide port.

[0008] Among them, the support seat is composed of a circular metal sheet body extending outward on its circumference to form a number of long sheet-shaped support legs. The extension means that the support legs are fixed integrally with the circular metal sheet body, that is, the support seat is integrated and is sheet-shaped when fully unfolded. This sheet-like structure makes the cost lower and the manufacturing more convenient (a sheet-like body can be pressed out first during production, and then the sheet-like body can be pressed into a support seat). In the conventional cognition of those skilled in the art, a sheet-like structure often means insufficient strength and easy deformation when subjected to greater pressure. In this one-way valve, although the support seat is a sheet-like structure, on the one hand, it is made of metal, and on the other hand, each supporting leg is bent backward to make the support seat as a whole conical (this can expand the rear end support area and reduce the center of gravity projection). The combination of these two makes the sheet-like structure of the support seat have a strong anti-deformation ability, which can ensure the structural stability under high pressure. In particular, the support legs are arranged at an angle relative to each other. The greater the fluid pressure, the more the support legs will tend to open toward the inner wall of the valve body. This will better support the fluid pressure so that the support seat will not deform, and will instead make the support seat have stronger and stronger anti-deformation ability.

[0009] In addition, the guide groove is on the side of the valve core, which is equivalent to all the guide grooves and the gap formed between the outer peripheral side of the support seat and the inner wall of the valve body are directly opposite. Therefore, the fluid will not change its flow direction when entering the gap from the guide groove, and the guide port formed between each adjacent support leg makes the fluid entering the gap flow straight or nearly straight through the support seat, so that the flow direction of the fluid hardly changes, thereby greatly reducing the fluid resistance encountered by the fluid when passing through the one-way valve, reducing energy loss and ensuring the operating stability of the equipment.

[0010] In the above-mentioned one-way valve, a positioning hole is provided at the rear end of the valve core, the front end of the spring rests against the bottom wall of the positioning hole, the radius of the circular metal sheet body is larger than the hole radius of the positioning hole, and the radius of the circular metal sheet body is smaller than the distance from the bottom wall of the guide groove to the center axis of the valve core.

[0011] As described above, under high pressure, the valve core is pressed against the circular metal sheet body of the support seat. The radius of the circular metal sheet body is smaller than the distance from the bottom wall of the guide groove to the central axis of the valve core. This prevents the circular metal sheet body from obstructing the guide groove under high pressure, and the flow cross-sectional area of ​​the guide groove remains unchanged, ensuring that the flow rate is not affected while reducing costs. This also ensures that the flow rate of the fluid flowing out of the guide groove does not fluctuate dramatically, ensuring that the high-pressure fluid does not encounter significant fluid resistance within the one-way valve.

[0012] In the above-mentioned one-way valve, the support seat is made of stainless steel.

[0013] The support seat is made of stainless steel, which ensures better strength on the basis of the sheet structure, ensuring that the support seat is less likely to deform during long-term use of the one-way valve, thereby ensuring structural stability.

[0014] In the above-mentioned one-way valve, an annular flange is provided in the valve body near the front end, the front end of the valve core abuts against the annular flange to form a seal, an annular mounting groove is provided in the valve body near the rear end, the blocking part is a retaining spring and the outer edge of the retaining spring is located in the annular mounting groove.

[0015] During installation, the valve core, spring, and support seat are placed sequentially into the valve body from the rear end. Finally, the retaining spring is installed from the rear end of the valve body into the annular mounting groove of the valve body, thereby positioning the valve core, spring, and support seat within the valve body. This connection method can shorten the axial length of the one-way valve and make the structure more compact. Moreover, the retaining spring acts as a barrier, does not affect the flow direction of the fluid and does not increase the fluid resistance, making assembly easier.

[0016] In the above-mentioned one-way valve, the rear side wall of the annular flange and the center hole wall are transitioned by an arc, the front end of the valve core has a taper, the outer diameter of the front end of the valve core gradually increases from front to back, and the front end of the valve core rests on the above-mentioned arc position of the annular flange.

[0017] By making an arc transition between the rear side wall of the annular flange and the center hole wall, the front end of the valve core rests against the above-mentioned arc position of the annular flange, so that a line contact sealing method is formed between the front end of the valve core and the annular flange. Compared with surface contact, this sealing method can have a better sealing effect during initial use (in case of surface contact, there are relatively high requirements for the parallelism of the two conical surfaces).

[0018] In the above-mentioned one-way valve, each supporting leg is provided with a flow guide hole.

[0019] By providing diversion holes on each support leg, the diversion holes can also play a role in flow passage. Of course, the provision of the diversion holes should not affect the strength of the support leg itself.

[0020] In this case, when the number of guide grooves matches the number of guide ports, in practice, the greater the fluid pressure, the more likely it is that the valve core will rotate, causing the guide grooves and the guide ports to be completely or partially offset (of course, the above-mentioned problem may also occur during installation). This is equivalent to the guide ports being completely or partially opposite to the physical part between two adjacent guide grooves. At this time, if there are no guide holes, all or part of the fluid flowing out of the guide grooves will need to turn. After the guide holes are set, when the valve core rotates and the guide grooves and the guide ports are completely or partially offset, the guide holes will be completely or partially opposite to the guide grooves, thereby ensuring that the flow direction of the fluid remains almost unchanged when flowing through the support seat to ensure that it will not be subject to large fluid resistance.

[0021] Alternatively, when the number of guide grooves is twice that of the guide ports, the fluid flowing out of a part of the guide grooves flows through the guide ports, while the fluid flowing out of the guide grooves and the guide ports flows through the guide holes, ensuring that the flow direction of the fluid remains almost unchanged when flowing through the support seat to ensure that it will not be subject to large fluid resistance.

[0022] Compared with the existing technology, this one-way valve has the following advantages:

[0023] 1. The support seat is composed of a circular metal sheet body extending outward on its circumference to form a number of long sheet-shaped support legs. The extension means that the support legs are fixed integrally with the circular metal sheet body, that is, the support seat is integrated and is sheet-shaped when fully unfolded. This sheet-like structure makes the cost lower and the manufacturing more convenient; at the same time, the support seat is made of metal on the one hand, and on the other hand, each supporting leg is bent backward to make the support seat as a whole conical. The combination of these two makes the sheet-like structure of the support seat have a strong anti-deformation ability, which can reduce the cost while ensuring the structural stability under high pressure.

[0024] 2. After the support seat is installed in the valve body, a ring-shaped gap will be formed between its outer peripheral side and the inner wall of the valve body, and the gap will gradually decrease from front to back. The guide groove on the side of the valve core will be opposite to the gap, and a guide port will be formed between the two adjacent support legs. That is to say, after flowing out of the guide groove, the fluid will directly enter the above-mentioned gap and flow backward with the help of the guide port, so that the fluid will hardly change its flow direction when flowing through the valve core and the support seat, thereby greatly reducing the fluid resistance encountered by the fluid when passing through the one-way valve, reducing energy loss and ensuring the operational stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the one-way valve in Example 1.

[0026] Figure 2 It is a front view of the one-way valve in Example 1.

[0027] Figure 3 yes Figure 2 Cross-sectional view along the AA axis.

[0028] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0029] Figure 5 It is a three-dimensional schematic diagram of the valve core.

[0030] Figure 6 It is a three-dimensional schematic diagram of the support base in Example 1.

[0031] Figure 7 It is a three-dimensional schematic diagram of the support base in embodiment 1 from another angle.

[0032] Figure 8 This is a cross-sectional view of the one-way valve in the first embodiment when it is open (the cross-sectional angle is the same as that of the Figure 3 same).

[0033] Figure 9 It is a cross-sectional view of the one-way valve in the second embodiment when it is closed.

[0034] Figure 10It is a three-dimensional schematic diagram of the support base in the second embodiment.

[0035] Figure 11 It is a three-dimensional schematic diagram of the support base in the second embodiment from another angle.

[0036] In the figure, 1, valve body; 1a, annular flange; 1b, annular mounting groove; 2, valve core; 2a, guide groove; 2b, positioning hole; 3, spring; 4, support seat; 4a, circular metal sheet body; 4b, supporting foot; 4b1, guide hole; 4c, guide port; 5, blocking part. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0038] Example 1

[0039] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a one-way valve comprises a valve body 1, a valve core 2, a spring 3, and a support seat 4, arranged in sequence from front to back within the valve body 1. The valve core 2 can slide back and forth within the valve body 1, and the spring 3 abuts between the valve core 2 and the support seat 4. The valve body 1 is cylindrical with two open ends (in this embodiment, the front and rear ends), and both ends of the valve body 1 have internal threads. An annular flange 1a is provided near the front end of the valve body 1. The valve core 2 is cylindrical and forms a clearance fit with the valve body 1. The front end of the valve core 2 is tapered, and the outer diameter of the front end of the valve core 2 gradually increases from front to back. A portion of the front end of the valve core 2 is inserted into the annular flange 1a, forming a seal. Specifically, the rear side wall of the annular flange 1a transitions with the center hole wall through a circular arc, and the front end of the valve core 2 abuts against the annular flange 1a at the aforementioned circular arc position. The side of the valve core 2 is provided with a plurality of guide grooves 2a along the circumference, and the guide grooves 2a are elongated along the axial direction of the valve body 1.

[0040] like Figure 3 、 Figure 6 and Figure 7As shown, the support seat 4 consists of a circular sheet metal body 4a with several support legs 4b extending outward from its circumference. The support seat 4 is made of stainless steel. Each support leg 4b is bent backward, giving the support seat 4 an overall tapered shape. Each support leg 4b is in the form of an elongated strip, with a flow guide 4c formed between adjacent support legs 4b. The support seat 4 is radially positioned within the valve body 1 by the support legs 4b. An annular stopper 5 is fixed or integrally provided behind the support seat 4 within the valve body 1, against which each support leg 4b abuts. An annular mounting groove 1b is provided near the rear end of the valve body 1. The stopper 5 is a retaining spring, the outer edge of which is positioned within the annular mounting groove 1b. During installation, the valve core 2, spring 3, and support seat 4 are sequentially inserted into the valve body 1 from the rear end. Finally, the retaining spring 6 is installed from the rear end of the valve body 1 into the annular mounting groove 1b of the valve body 1. This secures the valve core 2, spring 3, and support seat 4 within the valve body 1. The number of guide ports 4c is even, and the number of guide grooves 2a is twice that of the guide ports 4c. The flow cross-sectional area of ​​the guide ports 4c is larger than that of the guide grooves 2a. A positioning hole 2b is provided at the rear end of the valve core 2, and the front end of the spring 3 abuts against the bottom wall of the positioning hole 2b. The radius of the circular metal sheet body 4a is larger than the radius of the positioning hole 2b and smaller than the distance from the bottom wall of the guide groove 2a to the central axis of the valve core 2.

[0041] In the initial state, if Figure 1 As shown in the figure, the valve core 2 is pressed against the annular flange 1a under the elastic force of the spring 3 to form a seal. After the high-pressure fluid enters the valve body 1, the fluid pressure pushes the valve core 2 to overcome the action of the spring 3 and move backward, forming an opening between the valve core 2 and the annular flange 1a. The valve core 2 is continuously pressurized and pressed to the rear end to press against the circular metal sheet body 4a of the support seat 4. At this time, Figure 8As shown in FIG, the fluid can move backward through the guide groove 2a on the side of the valve core 2. Since the support seat 4 is composed of a circular metal sheet body 4a, a plurality of support legs 4b are extended outwardly from its circumference. Each support leg 4b is bent backward, giving the support seat 4 an overall conical shape. The support seat 4 is radially disposed within the valve body 1 via each support leg 4b. Therefore, after the support seat 4 is installed in the valve body 1, an annular gap is formed between its outer circumference (i.e., the portion formed by each support leg 4b) and the inner wall of the valve body 1, which gradually decreases from front to back. In this way, after the rear end of the valve core 2 abuts the support seat 4, the guide groove 2a on the side of the valve core 2 will be connected to the gap formed between the outer circumference of the support seat 4 and the inner wall of the valve body 1, and a guide port 4c is formed between two adjacent support legs 4b. In other words, after flowing out of the guide groove 2a, the fluid will directly enter the above-mentioned gap and flow backward through the guide port 4c. Among them, the guide groove 2a is on the side of the valve core 2, which is equivalent to all the guide grooves 2a and the gap formed between the outer peripheral side of the support seat 4 and the inner wall of the valve body 1 are in direct opposition. Therefore, the fluid will not change its flow direction when entering the gap from the guide groove 2a, and the guide port 4c formed between each adjacent support foot 4b makes the fluid entering the gap flow straight or nearly straight through the support seat 4, so that the flow direction of the fluid hardly changes, thereby greatly reducing the fluid resistance encountered by the fluid when passing through the one-way valve, reducing energy loss and ensuring the operating stability of the equipment.

[0042] The support seat 4 is composed of a circular metal sheet body 4a extending outward on its circumference to form a number of long, sheet-like support legs 4b. The extension means that the support legs 4b are fixed integrally with the circular metal sheet body 4a, that is, the support seat 4 is integral and is sheet-like when fully unfolded. This sheet-like structure makes the cost lower and the manufacturing more convenient (a sheet-like body can be pressed out first during production, and then the sheet-like body can be pressed into the support seat 4). In the conventional cognition of those skilled in the art, a sheet-like structure often means insufficient strength and is easy to deform when subjected to greater pressure. In this one-way valve, although the support seat 4 is a sheet-like structure, on the one hand, it is made of metal, and on the other hand, each support leg 4b is bent backward to make the support seat 4 as a whole conical. The combination of these two makes the sheet-like support seat 4 have a strong anti-deformation ability, which can ensure the structural stability under high pressure. In particular, each support foot 4b is arranged to be inclined relative to each other. The greater the fluid pressure, the more each support foot 4b will tend to open toward the inner wall of the valve body 1. This will better support the fluid pressure so that the support seat 4 will not deform. Instead, it will make the support seat 4 have stronger and stronger anti-deformation ability.

[0043] Example 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, Figure 9 、 Figure 10 and Figure 11 As shown, the number of the guide grooves 2a is twice that of the guide ports 4c, and each supporting leg 4b is provided with a guide hole 4b1.

[0045] Example 3

[0046] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the number of the guide ports 4c is consistent with the number of the guide grooves 2a, and each supporting leg 4b is provided with a guide hole 4b1.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A one-way valve, comprising a valve body (1) and a valve core (2), a spring (3) and a support seat (4) arranged in sequence from front to back in the valve body (1), wherein the valve core (2) can slide back and forth in the valve body (1), and a plurality of guide grooves (2a) are provided on the side of the valve core (2) along the circumferential direction, characterized in that: The support seat (4) is composed of a circular metal sheet body (4a) extending outward on its circumference to form a plurality of support legs (4b), each support leg (4b) is in the form of a long strip, each support leg (4b) is bent backward so that the support seat (4) is tapered as a whole, and a guide port (4c) is formed between two adjacent support legs (4b). The spring (3) abuts between the valve core (2) and the circular metal sheet body (4a), and the support seat (4) is radially positioned in the valve body (1) through each support leg (4b). An annular blocking portion (5) is fixed or integrally provided in the valve body (1) behind the support seat (4), and each support leg (4b) abuts against the blocking portion (5).

2. A one-way valve according to claim 1, characterized in that: The rear end of the valve core (2) is provided with a positioning hole (2b), the front end of the spring (3) abuts against the bottom wall of the positioning hole (2b), the radius of the circular metal sheet body (4a) is greater than the hole radius of the positioning hole (2b), and the radius of the circular metal sheet body (4a) is less than the distance from the bottom wall of the guide groove (2a) to the central axis of the valve core (2).

3. A one-way valve according to claim 1 or 2, characterized in that: The support seat (4) is a stainless steel part.

4. A one-way valve according to claim 1 or 2, characterized in that: An annular flange (1a) is provided near the front end of the valve body (1), and the front end of the valve core (2) abuts against the annular flange (1a) to form a seal. An annular mounting groove (1b) is provided near the rear end of the valve body (1), and the blocking portion (5) is a retaining spring, and the outer edge of the retaining spring is located in the annular mounting groove (1b).

5. A one-way valve according to claim 4, characterized in that: The rear side wall of the annular flange (1a) and the center hole wall are transitioned by an arc, the front end of the valve core (2) has a taper, the outer diameter of the front end of the valve core (2) gradually increases from front to back, and the front end of the valve core (2) abuts against the above-mentioned arc position of the annular flange (1a).

6. A one-way valve according to claim 1 or 2, characterized in that: Each supporting foot (4b) is provided with a flow guide hole (4b1).

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