A one-way valve

Abstract

The utility model provides a check valve belongs to mechanical technical field. It has solved the problem of high cost caused by guaranteeing structural stability. The check valve includes the valve body and by the valve core, spring and support seat of setting in the valve body from front to back in proper order, the valve core can slide in the valve body before and after, the valve core side part is equipped with a plurality of guide groove along the circumference, the support seat is formed by a circular metal sheet body and is outwardly extended on its circumference and forms a plurality of support feet, each support foot is long strip piece shape, each support foot is bent to the rear to make the support seat whole cone shape, forms the guide port between the adjacent two support feet, the spring is abutted between the valve core and the circular metal sheet body, the support seat is positioned in the valve body through each support foot, the annular blocking portion is fixed or integrally arranged in the valve body behind the support seat, each support foot is abutted on the blocking portion. It has the advantages such as low cost, good structural stability etc.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a one-way valve. Background Technology

[0002] A check valve, also known as a 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, a check valve disclosed in patent application number 202122081784.3 includes a valve body, a piston, and a valve seat. The valve body has an air inlet and a through hole coaxially connected to the air inlet. A conical surface is provided at the end of the through hole near the air inlet. The piston is placed inside the through hole, and the valve seat is located at the outer end of the through hole. The piston is stepped, including a cone that mates with the conical surface and a column that mates with the through hole. The column has guide grooves located at its outer edge, and at least two guide grooves are provided, evenly distributed. The valve seat includes a valve column and a stepped air outlet coaxially arranged. The valve column also has a collecting hole communicating with the air outlet, located at the end of the valve column near the piston. At least two collecting holes are provided, evenly distributed, and the axis of the collecting hole forms an acute angle with the axis of the air outlet. An elastic element for resetting the piston is provided between the piston and the valve seat. Gas enters the valve body through the inlet, pushing open the piston. The piston moves to the right, opening the gas passage. The gas then passes sequentially through the guide groove on the cylinder, the collection hole on the valve seat, and the outlet before exiting the one-way valve and entering the high-pressure gas pipe. After the gas intake stops, the high-pressure gas in the valve seat will flow back. This backflowing gas will push the piston to the left, making it fit against the inner wall of the valve body and preventing further backflow. The guide groove has a tendency to right the piston, which helps reduce friction with the inner wall of the valve body.

[0003] Under high-pressure fluid, the piston overcomes the elastic force of the elastic element and is directly pressed against the valve seat end. In other words, the pressure of the high-pressure fluid is applied to the valve seat through the piston. Referring to the accompanying drawings, the valve seat is designed to be roughly cylindrical and threaded into the valve body. This shape ensures the structural stability of the check valve under high-pressure fluid conditions, but it also increases the overall cost of the check valve. Because the manifolds on the valve seat are angled and numerous, the radial solid portion of the valve seat needs to be substantial. Since the valve seat is threaded to the valve body, the valve body also needs to be larger, further increasing the cost. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a one-way valve that solves the problem of high cost caused by ensuring structural stability.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A one-way valve includes a valve body and a valve core, a spring, and a support seat arranged sequentially from front to back within the valve body. The valve core can slide back and forth within the valve body, and a plurality of flow guide grooves are provided circumferentially on the side of the valve core. The support seat is characterized by being composed of a circular metal sheet extending outward from its circumference to form a plurality of support legs. Each support leg is elongated and bent backward to make the support seat conical in shape. A flow guide port is formed between two adjacent support legs. The spring abuts against the valve core and the circular metal sheet. The support seat is radially positioned within the valve body through the support legs. An annular blocking part is fixed or integrally provided behind the support seat within the valve body, and each support leg abuts against the blocking part.

[0007] After the high-pressure fluid enters the valve body, the fluid pressure pushes the valve core to overcome the spring and move backward. The valve core is pressed to its rear end against the circular metal plate 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 plate extending outward on its circumference to form several support legs, and each support leg bends backward to make the support seat conical in shape, the support seat is radially inserted into the valve body through each support leg. Therefore, after the support seat is installed in the valve body, an annular gap that gradually decreases from front to back is formed between its outer circumference (i.e., the part formed by each support leg) and the inner wall of the valve body. Thus, 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 in contact with 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 two adjacent support legs. That is to say, after the fluid flows out of the guide groove, it will directly enter the above-mentioned gap and flow backward through the guide port.

[0008] The support base consists of a circular metal sheet extending outwards along its circumference to form several elongated, sheet-like support legs. This extension means the support legs and the circular metal sheet are integrally fixed, making the support base a single unit that unfolds into a sheet shape. This sheet-like structure reduces cost and simplifies manufacturing (a sheet can be pre-pressed during production, and then the sheet can be pressed into the support base). In the conventional understanding of those skilled in the art, sheet-like structures often imply insufficient strength and susceptibility to deformation under high pressure. However, in this one-way valve, although the support base is sheet-like, it is made of metal, and each support leg bends backwards, giving the support base an overall conical shape (this increases the rear support area and lowers the center of gravity projection). This combination gives the sheet-like support base strong resistance to deformation, ensuring structural stability under high pressure. In particular, since each support foot is set at an angle, the greater the fluid pressure, the more the support feet will tend to open towards the inner wall of the valve body. This will better support the fluid pressure and prevent the support seat from deforming. Instead, it will make the support seat have increasingly stronger resistance to deformation.

[0009] Furthermore, the guide grooves are located on the side of the valve core, meaning that all the guide grooves are directly aligned with the gaps formed between the outer periphery of the support seat and the inner wall of the valve body. Therefore, the fluid does not change direction when entering the gap from the guide grooves. The guide ports formed between adjacent support legs ensure that the fluid entering the gap flows straight or nearly straight through the support seat. This results in almost no change in the flow direction of the fluid, which greatly reduces the fluid resistance encountered by the fluid when passing through the check valve, reduces energy loss, and ensures the operational stability of the equipment.

[0010] In the aforementioned one-way valve, the valve core has a positioning hole at its rear end, the front end of the spring abuts against the bottom wall of the positioning hole, the radius of the circular metal plate body is greater than the radius of the positioning hole, and the radius of the circular metal plate body is less than the distance from the bottom wall of the guide groove to the central axis of the valve core.

[0011] As described above, under high pressure, the valve core is pressed against the circular metal plate of the support base. The radius of the circular metal plate is smaller than the distance from the bottom wall of the guide channel to the central axis of the valve core. This ensures that the circular metal plate will not obstruct the guide channel under high pressure, and the flow cross-sectional area of ​​the guide channel remains unchanged, thus ensuring that flow rate is not affected while reducing costs. Simultaneously, this also ensures that the flow velocity of the fluid exiting the guide channel does not fluctuate drastically, guaranteeing that the high-pressure fluid will not experience significant fluid resistance within the check valve.

[0012] In one of the aforementioned check valves, the support base is made of stainless steel.

[0013] The support base is made of stainless steel, which provides better strength on the basis of the sheet structure, ensuring that the support base is less prone to deformation during long-term use of the one-way valve and ensuring structural stability.

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

[0015] During installation, the valve core, spring, and support seat are sequentially inserted into the valve body from the rear end. Finally, the retaining ring is installed into the annular mounting groove of the valve body from the rear end, thus positioning the valve core, spring, and support seat within the valve body. This connection method allows for a shorter axial length and a more compact structure in the check valve. Furthermore, the retaining ring, acting as a blocking component, does not affect the flow direction of the fluid and does not increase fluid resistance, making assembly convenient.

[0016] In the aforementioned one-way valve, the rear sidewall of the annular flange and the central hole wall are connected by an arc transition, 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 abuts against the aforementioned arc position of the annular flange.

[0017] By using an arc transition between the rear sidewall of the annular flange and the wall of the central hole, the front end of the valve core abuts against the aforementioned arc position of the annular flange, thus forming a line contact seal between the front end of the valve core and the annular flange. This sealing method provides a better sealing effect from the initial use compared to surface contact (surface contact requires a higher degree of parallelism between the two conical surfaces).

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

[0019] By creating flow guide holes on each support leg, the flow guide holes can also serve a flow passage function. Of course, the creation of the flow guide holes should not affect the strength of the support leg itself.

[0020] When the number of guide channels matches the number of guide ports, in practice, higher fluid pressure may cause the valve core to rotate. This can result in the guide channels and guide ports being completely or partially misaligned (of course, this problem may also occur during installation). Essentially, the guide port is completely or partially aligned with the solid portion between two adjacent guide channels. Without guide holes, all or part of the fluid flowing from the guide channels would need to bend. However, with guide holes, when the valve core rotates and the guide channels and guide ports are completely or partially misaligned, the guide holes will be completely or partially aligned with the guide channels. This ensures that the flow direction of the fluid passing over the support remains almost unchanged, preventing significant fluid resistance.

[0021] Alternatively, if the number of guide channels is twice that of guide ports, the fluid flowing out of some of the guide channels flows through the guide ports, while the fluid flowing out of the guide channels flows through the guide holes, ensuring that the flow direction of the fluid remains almost unchanged when flowing through the support to prevent it from experiencing significant fluid resistance.

[0022] Compared with existing technologies, this check valve has the following advantages:

[0023] 1. The support base consists of a circular metal sheet extending outwards from its circumference to form several elongated, sheet-like support legs. This extension means that the support legs and the circular metal sheet are integrally fixed, making the support base a single unit that unfolds into a sheet shape. This sheet-like structure reduces costs and makes manufacturing easier. Furthermore, the support base is made of metal, and the fact that each support leg bends backwards to make the entire support base conical in shape gives it strong resistance to deformation. This reduces costs while ensuring structural stability under high pressure.

[0024] 2. After the support seat is installed in the valve body, an annular gap that gradually decreases from front to back will be formed between its outer circumference and the inner wall of the valve body. The guide groove on the side of the valve core will be directly opposite this gap, and a guide port will be formed between two adjacent support feet. That is to say, after the fluid flows out of the guide groove, it will directly enter the gap mentioned above and flow backward with the help of the guide port. This makes the fluid flow almost without any change in flow direction when it flows through the valve core and the support seat, thereby greatly reducing the fluid resistance encountered by the fluid when passing through the check valve, reducing energy loss and ensuring the operational stability of the equipment. Attached Figure Description

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

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

[0027] Figure 3 yes Figure 2 Sectional view along the AA direction.

[0028] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

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

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

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

[0032] Figure 8 This is a cross-sectional view of the one-way valve when it is open in Embodiment 1 (the viewing angle is...). Figure 3 same).

[0033] Figure 9 This is a cross-sectional view of the one-way valve in Embodiment 2 when it is closed.

[0034] Figure 10This is a three-dimensional schematic diagram of the support base in Embodiment 2.

[0035] Figure 11 This is a three-dimensional schematic diagram of the support base from another angle in Embodiment 2.

[0036] In the figure, 1 is the valve body; 1a is the annular flange; 1b is the annular mounting groove; 2 is the valve core; 2a is the flow guide groove; 2b is the positioning hole; 3 is the spring; 4 is the support base; 4a is the circular metal plate body; 4b is the support foot; 4b1 is the flow guide hole; 4c is the flow guide port; and 5 is the blocking part. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, 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 includes a valve body 1 and a valve core 2, a spring 3, and a support seat 4 arranged sequentially 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 against the valve core 2 and the support seat 4. The valve body 1 is a cylindrical shape with openings at both ends, which in this embodiment are the front and rear ends. 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 has a taper, 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 and forms a seal. Specifically, the rear side wall of the annular flange 1a and the central hole wall are transitioned by an arc, and the front end of the valve core 2 abuts against the aforementioned arc position of the annular flange 1a. Several guide grooves 2a are provided circumferentially on the side of the valve core 2, 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 base 4 is composed of a circular metal sheet body 4a extending outwards from its circumference to form several support legs 4b. The support base 4 is made of stainless steel, and each support leg 4b is bent backwards to make the support base 4 as a whole conical shape. Each support leg 4b is a long strip-shaped piece, and a guide port 4c is formed between adjacent support legs 4b. The support base 4 is radially positioned inside the valve body 1 by the support legs 4b. An annular blocking part 5 is fixed or integrally provided behind the support base 4 inside the valve body 1, and each support leg 4b abuts against the blocking part 5. Among them, an annular mounting groove 1b is provided inside the valve body 1 near the rear end, and the blocking part 5 is a retaining spring with its outer edge located inside the annular mounting groove 1b. During installation, the valve core 2, spring 3, and support base 4 are sequentially inserted into the valve body 1 from the rear end, and finally the retaining spring 6 is installed into the annular mounting groove 1b of the valve body 1 from the rear end, thereby achieving the positioning of the valve core 2, spring 3, and support base 4 inside the valve body 1. The number of flow guide ports 4c is even, and the number of flow guide grooves 2a is twice that of the flow guide ports 4c. The flow cross-sectional area of ​​the flow guide ports 4c is larger than that of the flow guide grooves 2a. The rear end of the valve core 2 is provided with a positioning hole 2b, and the front end of the spring 3 abuts against the bottom wall of the positioning hole 2b. The radius of the circular metal plate body 4a is larger than the radius of the positioning hole 2b, and the radius of the circular metal plate body 4a is smaller than the distance from the bottom wall of the flow guide groove 2a to the central axis of the valve core 2.

[0041] In the initial state, such as Figure 1 As shown, the valve core 2, under the elastic force of the spring 3, abuts against the annular flange 1a to form a seal. After the high-pressure fluid enters the valve body 1, the fluid pressure will push the valve core 2 to move backward against the force of the spring 3, forming an opening between the valve core 2 and the annular flange 1a. The valve core 2 is continuously pressed and pushed to its rear end, abutting against the circular metal plate body 4a of the support seat 4. At this time, it is as if... Figure 8As shown, 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 extending outward on its circumference to form several support legs 4b, each support leg 4b is bent backward to make the support seat 4 as a whole conical shape. The support seat 4 is radially inside the valve body 1 through each support leg 4b. Therefore, after the support seat 4 is installed inside the valve body 1, an annular gap that gradually decreases from front to back will be formed between its outer circumference (that is, the part formed by each support leg 4b) and the inner wall of the valve body 1. In this way, after the rear end of the valve core 2 abuts against the support seat 4, the guide groove 2a on the side of the valve core 2 will be in contact with 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. That is to say, after the fluid flows out of the guide groove 2a, it 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 means that all the guide grooves 2a are directly opposite the gap formed between the outer periphery of the support seat 4 and the inner wall of the valve body 1. Therefore, the fluid will not change its flow direction when it enters the gap from the guide groove 2a. The guide port 4c formed between each pair of adjacent support feet 4b makes the fluid entering the gap flow straight or nearly straight through the support seat 4. This makes the flow direction of the fluid almost unchanged, thereby greatly reducing the fluid resistance encountered by the fluid when passing through the check valve, reducing energy loss and ensuring the operational stability of the equipment.

[0042] The support base 4 is composed of a circular metal sheet body 4a extending outwards along its circumference to form several elongated, sheet-like support legs 4b. This extension means that the support legs 4b and the circular metal sheet body 4a are integrally fixed, meaning the support base 4 is a single unit and, when fully unfolded, is sheet-like. This sheet-like structure reduces cost and simplifies manufacturing (a sheet-like body can be pressed out during production, and then the sheet-like body can be pressed into the support base 4). In the conventional understanding of those skilled in the art, sheet-like structures often imply insufficient strength and susceptibility to deformation under high pressure. However, in this one-way valve, although the support base 4 is a sheet-like structure, it is made of metal, and each support leg 4b bends backwards, making the support base 4 as a whole conical shape. This combination gives the sheet-like support base 4 strong resistance to deformation, ensuring structural stability under high pressure. In particular, each support foot 4b is set at an angle. The greater the fluid pressure, the more the support foot 4b will tend to open towards the inner wall of the valve body 1. This will better support the fluid pressure and prevent the support seat 4 from deforming. Instead, it will make the support seat 4 have stronger and stronger resistance to deformation.

[0043] Example 2

[0044] This embodiment is basically the same in structure and principle as Embodiment 1, except that: in this embodiment, as Figure 9 , Figure 10 and Figure 11 As shown, the number of flow channels 2a is twice that of flow ports 4c, and each support foot 4b is provided with a flow hole 4b1.

[0045] Example 3

[0046] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the number of guide ports 4c is consistent with the number of guide grooves 2a, and each support foot 4b is provided with a guide hole 4b1.

[0047] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by 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 sequentially from front to back within the valve body (1), wherein the valve core (2) is capable of sliding back and forth within the valve body (1), and the side of the valve core (2) is provided with a plurality of guide grooves (2a) along the circumferential direction, characterized in that, The support base (4) is composed of a circular metal sheet body (4a) extending outward on its circumference to form several support legs (4b). Each support leg (4b) is a long strip-shaped piece. Each support leg (4b) is bent backward so that the support base (4) is cone-shaped as a whole. A guide port (4c) is formed between two adjacent support legs (4b). The spring (3) abuts against the valve core (2) and the circular metal sheet body (4a). The support base (4) is radially positioned in the valve body (1) through each support leg (4b). An annular blocking part (5) is fixed or integrally provided in the valve body (1) behind the support base (4). Each support leg (4b) abuts against the blocking part (5).

2. A one-way valve according to claim 1, characterized in that, The valve core (2) has a positioning hole (2b) at its rear end. The front end of the spring (3) abuts against the bottom wall of the positioning hole (2b). The radius of the circular metal plate body (4a) is greater than the radius of the positioning hole (2b). The radius of the circular metal plate 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 base (4) is made of stainless steel.

4. A check valve according to claim 1 or 2, characterized in that, The valve body (1) has an annular flange (1a) near the front end, and the front end of the valve core (2) abuts against the annular flange (1a) to form a seal. The valve body (1) has an annular mounting groove (1b) near the rear end, and the blocking part (5) is a snap ring with the outer edge of the snap ring located in the annular mounting groove (1b).

5. A one-way valve according to claim 4, characterized in that, The rear sidewall of the annular flange (1a) and the central hole wall are connected by an arc. The front end of the valve core (2) is tapered. The outer diameter of the front end of the valve core (2) gradually increases from front to back. The front end of the valve core (2) abuts against the arc position of the annular flange (1a).

6. A check valve according to claim 1 or 2, characterized in that, Each support leg (4b) is provided with a flow guide hole (4b1).

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