One-way valve sealing mechanism

Abstract

The present invention discloses a one-way valve sealing mechanism, including a valve seat, a valve core and a spring, wherein the valve core is assembled from a valve core body, a core shaft and a soft sealing pad, the soft sealing pad is located in a semi-enclosed annular cavity formed by the valve core body and the core shaft, and a seal is formed by the contact between the end face of the annular sealing boss of the valve seat and the soft sealing pad. The mechanism of the present invention is simple in design and easy to process. At the same time, since the annular sealing boss on the valve seat is perpendicular to the surface of the soft sealing pad, destructive shear force on the surface of the soft sealing pad during the use of the valve is avoided, thereby effectively protecting the surface of the soft sealing pad and solving the shortcomings of the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of one-way valve sealing, in particular to a one-way valve sealing mechanism. Background Art

[0002] Check valves are widely used in fluid systems. Currently, check valve sealing structures primarily include ball seals and conical soft seals. Ball seals create a seal through hard contact between the steel ball and the sealing surface of the valve seat, resulting in a high sealing pressure ratio. However, they require very high machining precision for the valve seat, making it difficult for conventional equipment to achieve these requirements.

[0003] The conical soft seal is a common soft seal type for one-way valves. It incorporates a soft seal groove in the center of the outer conical surface of the metal valve core. The outer conical surface of the valve core mates with the inner conical surface of the valve seat, creating a seal between the valve core and the valve seat. This seal is easier to manufacture than a ball seal. The structural characteristics of the conical soft seal mechanism are that the outermost surface of the soft seal must protrude beyond the outer conical surface of the metal valve core, and the width of the soft seal groove must be greater than the thickness of the soft seal itself to ensure that the soft seal material can deform under pressure and form a seal. This structural feature causes a small gap to appear between the conical surface of the valve core and the conical surface of the valve seat when the valve is about to open. Due to the extrusion force along the sealing conical surface, the side of the soft seal is pushed toward the sharp corner of the valve core groove and forms a high shearing force inside the soft seal. Similarly, when the valve is just opened, high-pressure fluid rushes out from the inside. The friction between the soft seal and the fluid will also push the soft seal toward the sharp corner of the groove and form a shearing force inside the soft seal. In both cases, the internal shear force of the soft seal will cause surface damage of the soft seal. Once such damage occurs, seal failure will be inevitable. The current method to extend the life of the soft seal is to increase the hardness of the soft seal or use more special materials to make the soft seal. However, as the hardness of the soft seal increases, it is difficult to deform under low pressure. The surface quality of the soft seal and the roughness requirements of the valve seat sealing surface must be improved accordingly, which will increase the manufacturing difficulty and production cost. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a sealing mechanism for a one-way valve. This mechanism adopts a soft seal in a semi-enclosed cavity, has a high sealing pressure ratio, is easy to process, and also basically eliminates the internal shear force that causes damage to the soft sealing surface as described in the background technology, thereby solving the shortcomings of the existing technology.

[0006] (2) Technical solution:

[0007] In order to solve the above problems, the present invention provides the following technical solution: a one-way valve sealing mechanism, characterized in that the mechanism includes:

[0008] The valve seat has a flow channel hole, an annular sealing boss and a limiting plane, wherein the flow channel hole is located at the center of the annular sealing boss, and the limiting plane is located at the root of the annular sealing boss;

[0009] The valve core is composed of a valve core body, a core shaft and a soft sealing gasket; the sealing end of the valve core body is a semi-closed cavity with an orifice flange, and a threaded hole connected to the core shaft is provided at the center of the bottom of the cavity; one end of the core shaft is an external thread, which is connected to the internal thread at the center of the bottom of the semi-closed cavity of the aforementioned valve core body, and the other end is a guide rod part, the outer diameter of which is a clearance fit with the flow channel hole of the valve seat, and the middle part is an interference fit with the hole of the soft sealing gasket; the valve core body and the core shaft are assembled to form a semi-closed annular cavity; the soft sealing gasket is located in the semi-closed annular cavity formed by the valve core body and the core shaft. The bottom of the core shaft, its inner hole and the outer diameter of the core shaft, its bottom and the bottom of the semi-enclosed annular cavity, its side and the side of the semi-enclosed annular cavity are all tightly fitted, and there is a gap between its top and the mouth flange of the valve core body; the outer diameter of the non-threaded end of the core shaft and the mouth flange of the sealing end of the valve core body form an annular orifice, and this annular orifice and the annular sealing boss on the valve seat are clearance-matched; after the valve core is assembled, in the absence of fluid pressure, the distance from the top surface of the soft sealing gasket to the end face of the valve core body is less than the distance between the end face of the annular sealing boss on the valve seat and the limit plane;

[0010] The compression spring is used to push the valve core when there is no pressure inside the system, so that the top surface of the soft sealing gasket fits with the end surface of the annular sealing boss of the valve seat to form a seal.

[0011] As a preferred embodiment, the valve core body and the core shaft can be processed into an integral form.

[0012] As a preferred embodiment, the non-threaded end of the core shaft has a blind hole, which is connected to a radial through hole to reduce the impact of the fluid in the system on the surface of the soft sealing gasket when it rushes out quickly.

[0013] (3) Beneficial effects

[0014] The advantages of this invention over existing technologies include: The invention utilizes a structure in which the annular sealing boss on the valve seat contacts the soft sealing gasket in a perpendicular direction, resulting in a high sealing pressure ratio, a simple structure, and ease of fabrication. Before the valve is opened, under the action of internal pressure, the surface of the soft sealing gasket always adheres to and wraps around the end face of the annular sealing boss. However, once the end face of the annular sealing boss and the surface of the soft sealing gasket lose contact, i.e., when the valve is opened, the internal system pressure pushes the soft sealing gasket toward the bottom of the semi-enclosed annular cavity. During the use of the valve, the soft sealing gasket described in the present invention will not be subjected to the destructive shear force that the soft seal in the conical soft sealing mechanism mentioned in the background technology is subjected to, thereby ensuring the sealing effect and preventing the damage of the soft seal, thereby extending the service life of the valve; at the same time, through the design of the valve seat limiting plane and the gap left between the top surface of the soft sealing gasket and the top surface of the semi-closed annular cavity of the valve core, it is ensured that when the end face of the valve core body contacts the valve seat limiting plane, the soft sealing gasket is still in the semi-closed annular cavity of the valve core, and will not be squeezed into the gap between the valve seat annular sealing boss and the valve core, thereby preventing the soft sealing gasket from excessive deformation under high pressure conditions, so that the entire sealing mechanism can be used for both low pressure and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the sealing structure of the present invention in a sealed state;

[0016] Figure 2 Schematic diagram of the valve seat structure of the mechanism of the present invention;

[0017] Figure 3 A schematic diagram of the valve core body structure of the mechanism of the present invention;

[0018] Figure 4 A schematic diagram of the core shaft structure of the mechanism of the present invention;

[0019] Figure 5 Schematic diagram of the assembled valve core of the mechanism of the present invention;

[0020] Figure 6 A schematic diagram of the sealing mechanism of the mechanism of the present invention when it is in a fully open state;

[0021] The following are the descriptions of the reference numerals:

[0022] 1 valve seat, 2 valve core body, 3 core shaft, 4 soft sealing gasket, 5 compression spring DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific implementation methods.

[0024] See also Figure 2The structure of the valve seat 1 is shown, wherein 11 is the sealing end surface of the annular sealing boss on the valve seat, 12 is the flow channel hole of the valve seat, 13 is the outer diameter of the annular sealing boss, and 14 is the limit plane on the valve seat;

[0025] Figure 3 A schematic diagram of the sealing structure of the valve core body 2 is shown, wherein 21 is the mouth flange, 22 is the inner cavity of the semi-enclosed cavity, 23 is the internal thread that can be connected to the external thread of the core shaft 4, 24 is the front end surface of the valve core body, and 25 is the bottom surface of the semi-enclosed cavity;

[0026] Figure 4 Schematic diagram of the structure of the core shaft, wherein 31 is the guide rod part, 32 is the soft sealing gasket step, 33 is the external thread connected to the valve core body, and the center of the guide rod part 31 has a blind hole 34 connected to a side through hole 35;

[0027] Figure 5 This is a schematic diagram of an assembled valve core. The assembly steps of the valve core are as follows: first, install the soft sealing gasket 4 into the semi-enclosed inner cavity 22 of the sealing end of the valve core body 2, and then pass the external thread 33 of the core shaft 3 through the center hole of the soft sealing gasket 4 and tighten it with the internal thread 23 of the valve core body 2 to complete the installation. The soft sealing gasket 4 is located at the bottom of the semi-enclosed annular cavity formed by the valve core body 2 and the core shaft 3. Its inner hole is tightly fitted with the outer diameter of the core shaft 3, its bottom is tightly fitted with the bottom of the semi-enclosed annular cavity, and its side is tightly fitted with the side 22 of the semi-enclosed annular cavity. There is a gap between its top plane and the plane of the inner cavity of the mouth flange of the valve core body;

[0028] Figure 1 This is a schematic diagram of the sealing structure of the present invention in a sealed state, showing the relative positions of the various parts of the structure of the present invention when there is no internal pressure. It includes a valve seat part 1, a valve core body 2, a soft sealing gasket 4, and a core shaft 3 that together form a complete valve core. Under the action of the compression spring 5, a semi-closed cavity seal is formed between the valve seat and the valve core.

[0029] Figure 6 A schematic diagram showing the sealing mechanism of the mechanism of the present invention in a fully open state;

[0030] Specific working principle:

[0031] A one-way valve sealing mechanism of the present invention, see Figure 1, including the valve seat part 1, the valve core body 2 and the soft sealing gasket 4, and the core shaft 3 are assembled together to form a complete valve core. When there is no pressure inside the system, under the action of the spring 5, a seal is formed between the sealing end face 11 of the annular sealing boss on the valve seat 1 and the end face of the soft sealing gasket 4 in the valve core; when there is pressure inside the system, the valve core is pushed toward the valve seat by the pressure, and the soft sealing gasket 4 is deformed under the action of the pressure and fits the end face 11 of the annular sealing boss on the valve seat 1, thereby maintaining a sealed state; when the pressure in the system increases to a certain value, the front end face 24 of the valve core body 2 contacts the limiting step 14 on the valve seat 1. At this time, even if the internal pressure of the system increases further, the valve core remains in a stopped state, thereby preventing the soft sealing gasket 4 from being excessively deformed under high pressure and keeping it always located in the annular semi-closed cavity of the valve core without being squeezed out from the gap between the annular sealing boss of the valve seat 1 and the valve core;

[0032] When the pressure on the left side of the one-way valve using the mechanism of the present invention increases, the pressure acts on the top of the guide rod portion 31 of the core shaft 3, the entire valve core is pushed open to the right, the compression spring 5 is compressed, and when the end face 11 of the annular sealing boss on the valve seat 1 is out of contact with the surface of the soft sealing gasket 4, the valve begins to open. When the valve core is continued to be pushed to the right by the pressure, the fluid on the left side simultaneously flows to the right through the radial through hole 35 and the blind hole 34 on the core shaft, reducing the impact on the surface of the soft sealing gasket 4, until the one-way valve is fully opened under the action of pressure. Figure 6 shown.

[0033] Before the valve opens, under the action of internal pressure, the surface of soft sealing gasket 4 always adheres to and wraps around the end surface 11 of the annular sealing boss of valve seat 1. Once the end surface 11 of the annular sealing boss and the surface of soft sealing gasket 4 are no longer in contact, that is, when the valve opens, the internal pressure of the system pushes the soft sealing gasket 4 toward the bottom 25 of the semi-enclosed annular cavity. During the opening and closing of the valve, the soft sealing gasket 4 of the present invention is not subjected to the destructive shear forces experienced by the soft seal in the conical soft sealing mechanism mentioned in the background art, thereby preventing damage to the soft seal and ensuring the effectiveness of the seal.

[0034] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. It will be apparent to those skilled in the art that improvements or modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A one-way valve sealing mechanism, characterized in that: The mechanism comprises: a valve seat having a flow channel hole, an annular sealing boss and a limiting plane, wherein the flow channel hole is located at the center of the annular sealing boss, and the limiting plane is located at the root of the annular sealing boss; The valve core is composed of a valve core body, a core shaft and a soft sealing gasket; The sealing end of the valve core body is a semi-enclosed cavity with an orifice flange, and a threaded hole connected to the core shaft is arranged at the center of the bottom of the cavity; one end of the core shaft is an external thread connected to the internal thread at the center of the bottom of the semi-enclosed cavity of the valve core body, and the other end is a guide rod part, whose outer diameter is a clearance fit with the flow channel hole of the valve seat, and the middle part is an interference fit with the hole of the soft sealing gasket; the valve core body and the core shaft are assembled to form a semi-enclosed annular cavity; the soft sealing gasket is located at the bottom of the semi-enclosed annular cavity formed by the valve core body and the core shaft, and its inner hole is in contact with the core shaft. The outer diameter of the shaft, its bottom and the bottom of the semi-enclosed annular cavity, and its side and the side of the semi-enclosed annular cavity are all tightly fitted, and there is a gap between its top and the mouth flange of the valve core body; the outer diameter of the non-threaded end of the core shaft and the mouth flange of the sealing end of the valve core body form an annular orifice, and this annular orifice and the annular sealing boss on the valve seat are in a clearance fit; after the valve core is assembled, in the absence of fluid pressure, the distance from the top surface of the soft sealing pad to the end surface of the valve core body is smaller than the distance from the end surface of the annular sealing boss on the valve seat to the limit plane; A compression spring is used to push the valve core when there is no pressure inside the system, so that the top surface of the soft sealing pad fits with the end surface of the annular sealing boss of the valve seat to form a seal; The non-threaded end of the core shaft is provided with a blind hole and a radial through hole connected thereto.

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