One-way valve with double-sealing structure

Abstract

The utility model discloses a one-way valve with a double-sealing structure. The one-way valve comprises an inlet connector, an outlet connector, a valve element assembly and a compression spring. The inlet joint is in threaded connection with the outlet joint; the valve element assembly comprises a valve element shaft, a first sealing piece and a second sealing piece. The valve element shaft sequentially comprises a guide column part, a sealing step part and a piston step part. The guide column part is of a cavity structure, and at least one exhaust hole is formed in the side wall of the guide column part. A first groove is formed in the joint of the sealing step part and the guide column part, and the first sealing piece is arranged in the first groove; a second groove is formed in the outer diameter of the step part of the piston, and the second sealing piece is arranged in the second groove; the valve element assembly forms double sealing of step sealing and piston sealing in a cavity of the outlet connector, and resetting of the valve element assembly is conducted through a compression spring assembled between the valve element assembly and the inlet connector. The one-way valve with the double-sealing structure is simple in structure, good in sealing performance, long in service life and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to a one-way valve with a double sealing structure. Background Art

[0002] One-way valves are widely used in production factories. For example, the terminals of compressed air delivery in factories are generally equipped with one-way valves that can be opened with plug-in connectors. Currently, such one-way valves on the market often use a single sealing structure with a single sealing ring between the valve core and the valve seat. Frequent plugging and unplugging in daily work often causes wear of the sealing ring in the valve and causes air leakage. Air leakage not only causes loss of energy and gas, but the noise from the leakage point also causes trouble to employees. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies of the prior art, the utility model provides a one-way valve with a double sealing structure, in which a double seal is adopted between the valve core and the valve body inside the one-way valve, which not only improves the sealing reliability of the valve, but also prolongs the service life of the valve, thereby improving the deficiencies of the prior art.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the utility model provides the following technical solutions: a one-way valve with a double sealing structure, characterized in that the valve comprises: an inlet connector, an outlet connector, a valve core assembly and a compression spring;

[0007] The outlet joint is a first hollow column that is through-through from front to back; a first convex ring is provided on the inner wall of the first hollow column, and the first convex ring divides the chamber of the first hollow column into a first front chamber and a first rear chamber;

[0008] The inlet joint is a second hollow column that is through-through from front to back; the inner wall of the second hollow column is provided with a second convex ring, and the second convex ring divides the chamber of the second hollow column into a second front chamber and a second rear chamber;

[0009] The inlet connector and the outlet connector are connected by threads, so that the first front chamber, the first rear chamber, the second front chamber, and the second rear chamber are connected in sequence;

[0010] The valve core assembly comprises a valve core shaft, a first sealing member and a second sealing member;

[0011] The valve core shaft comprises a guide column part, a sealing step part and a piston step part in sequence;

[0012] The guide column part is a cavity structure, and at least one exhaust hole is arranged on its side wall; the outer diameter of the guide column part is smaller than the inner diameter of the first convex ring; the outer diameter of the sealing step part is larger than the inner diameter of the first convex ring and smaller than the inner diameter of the first rear chamber; a first groove is arranged at the connection between the sealing step part and the guide column part, and the first sealing member is arranged in the first groove; the outer diameter of the first sealing member is larger than the inner diameter of the first convex ring and smaller than the inner diameter of the first rear chamber; the guide column part passes through the first convex ring and enters the first front chamber, and the side surface of the first sealing member abuts against the first convex ring, so that the first front chamber is blocked from the first rear chamber, and a first heavy seal is formed between the first front chamber and the first rear chamber;

[0013] The outer diameter of the piston step portion is larger than the outer diameter of the sealing step portion, and the outer diameter of the piston step portion and the inner diameter of the first rear chamber are matched with each other by a piston; a second groove is arranged on the outer diameter of the piston step portion, and the second sealing member is arranged in the second groove; the guide column portion passes through the first convex ring and enters the first front chamber, and the second seal, namely the piston seal, is formed between the piston step portion, the second sealing member and the first rear chamber;

[0014] One end of the compression spring is connected to the bottom of the piston step portion of the valve core shaft, and the other end is connected to the second convex ring.

[0015] Preferably, a first protrusion is provided at the bottom of the piston step portion of the valve core shaft; one end of the compression spring is connected to the first protrusion, and the other end thereof is connected to the second protruding ring.

[0016] Preferably, it also includes a third sealing member; the inner wall of the second front chamber is provided with a first internal thread, the outer wall of the first rear chamber is provided with a first external thread matching the first internal thread, the bottom end of the first external thread is provided with a third groove, and the third sealing member is arranged in the third groove.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model has the following beneficial effects: the one-way valve with a double sealing structure provided by the utility model, the first seal is a seal formed by the side of the first sealing member and the side of the first convex ring, and the second seal is a piston seal formed between the second sealing member and the first rear chamber. Compared with the conventional one-way valve with a single seal, the reliability of the seal is improved; the double sealing structure ensures that the failure of any one seal during use does not change the effectiveness of the valve seal, and the valve seal will fail only when the double seals fail at the same time, thereby extending the service life of the valve. At the same time, the one-way valve with a double sealing structure provided by the utility model is also provided with a third seal at the connection between the inlet joint and the outlet joint, which further ensures air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the one-way valve of the utility model when it is in a sealed state;

[0020] Figure 2 A schematic diagram of the structure of the one-way valve outlet joint of the utility model;

[0021] Figure 3 A schematic diagram of the structure of the valve core assembly of the one-way valve of the utility model;

[0022] Figure 4 A schematic structural diagram of a valve core shaft in a valve core assembly of a one-way valve of the utility model;

[0023] Figure 5 A schematic diagram of the inlet joint structure of the one-way valve of the utility model;

[0024] Figure 6 A schematic diagram of a valve core assembly of a one-way valve of the utility model in a top-open state;

[0025] The following are the descriptions of the reference numerals:

[0026] 1 outlet connector, 2 valve core assembly, 3 inlet connector, 4 compression spring, 5 third seal Implementation

[0027] 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.

[0028] See also Figure 2 The schematic diagram of the structure of the one-way valve outlet connector 1 of the utility model is shown, wherein 11 is a first convex ring, 12 is a first front chamber, 13 is a first rear chamber, 14 is a first external thread connected with the inlet connector 3, and 15 is a third groove;

[0029] Figure 3The schematic diagram of the structure of the valve core assembly 2 of the one-way valve of the utility model is shown, wherein 21 is the valve core shaft, 22 is the first sealing member, and 23 is the second sealing member;

[0030] Figure 4 The structure schematic diagram of the valve core shaft 21 in the valve core assembly 2 of the one-way valve of the utility model is shown, and the valve core shaft 21 is provided with a guide column part 211, a sealing step part 212, a piston step part 213 and a first protrusion 214 arranged at the bottom thereof in sequence; 2111 is the internal cavity of the guide column part 211, 2112 is the exhaust hole on the side wall of the guide column part 211, a first groove 2121 is arranged at the connection between the sealing step part 212 and the guide column part 211, and a second groove 2131 is arranged on the piston step part 213;

[0031] Figure 5 The schematic diagram of the structure of the inlet connector 3 of the one-way valve of the utility model is shown, wherein 31 is a second convex ring, 32 is a second front chamber, 33 is a second rear chamber, and 34 is a first internal thread provided on the inner wall of the second front chamber;

[0032] Figure 1 This is a schematic diagram of the one-way valve of the utility model in a sealed state, including an outlet joint 1, a valve core shaft 21, a first seal 22, and a second seal 23 together forming a valve core assembly 2, the outlet joint 1 and the inlet joint 3 are threadedly connected, and a third seal 5 is used to seal between the outlet joint 1 and the inlet joint 3; under the action of the compression spring 4, the side of the first seal 22 forms a first seal, and the second seal 23 forms a second seal.

[0033] Figure 6 A schematic diagram is shown of the valve core assembly of the one-way valve of the utility model in the top open state, at which time the first seal 22 and the second seal 23 are both disengaged from the sealing position, the exhaust hole on the valve core shaft 21 connects the inlet end and the outlet end of the valve, and the one-way valve is in the open state.

[0034] Specific working principle:

[0035] The one-way valve with double sealing structure of the utility model, see Figure 1 , including an outlet connector 1, a valve core shaft 21 and a first seal 22, a second seal 23 together form a complete valve core assembly 2, an inlet connector 3, a compression spring 4 and a third seal 5; the left side of the one-way valve is the inlet, and the right side is the outlet; after the inlet of the one-way valve is connected to the gas supply equipment, the outlet of the one-way valve is connected to the gas-using equipment; when the outlet of the one-way valve is not connected to the gas-using equipment, the one-way valve is as Figure 1As shown in the figure, under the combined action of the compression spring 4 and the inlet pressure, the valve core assembly 2 moves to the right, and forms a first contact seal with the outlet joint 1 at the first seal 22, and a second seal, i.e., a piston seal, is formed at the second seal 23, so that a barrier is formed between the inlet and outlet of the one-way valve, and the valve is in a fully closed state; the third seal 5 at the threaded connection between the inlet joint 3 and the outlet joint 1 ensures the overall air tightness of the valve; when gas is needed in production, the push rod on the gas-using equipment pushes the valve core assembly 2 of the one-way valve from the right to the left, and the one-way valve is as shown in the figure. Figure 6 As shown, at this time, the first sealing member 22 and the second sealing member 23 are both disengaged from the sealing position, and the gas medium at the inlet end enters the second front chamber 32 through the second rear chamber 33 of the inlet joint 3, and then enters the first rear chamber 13 of the outlet joint 1, and is transported to the gas-using device through the exhaust hole 2112 on the valve core shaft 21, and the valve is in an open state; after the gas is used, the push rod of the gas-using device is pulled out, and under the combined action of the compression spring 4 and the pressure at the inlet end, the valve core assembly 2 moves to the right, and the one-way valve returns to the state as shown in FIG. Figure 1 The marked closed state.

[0036] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements or modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A one-way valve with a double sealing structure, characterized in that: The valve comprises: an inlet connector, an outlet connector, a valve core assembly and a compression spring; The outlet joint is a first hollow column that is through-through from front to back; a first convex ring is provided on the inner wall of the first hollow column, and the first convex ring divides the chamber of the first hollow column into a first front chamber and a first rear chamber; The inlet joint is a second hollow column that is through-through from front to back; the inner wall of the second hollow column is provided with a second convex ring, and the second convex ring divides the chamber of the second hollow column into a second front chamber and a second rear chamber; The inlet connector and the outlet connector are connected by threads, so that the first front chamber, the first rear chamber, the second front chamber, and the second rear chamber are connected in sequence; The valve core assembly comprises a valve core shaft, a first sealing member and a second sealing member; the valve core shaft comprises a guide column portion, a sealing step portion and a piston step portion in sequence; the guide column portion is a cavity structure, and at least one exhaust hole is arranged on its side wall; the outer diameter of the guide column portion is smaller than the inner diameter of the first convex ring; the outer diameter of the sealing step portion is larger than the inner diameter of the first convex ring and smaller than the inner diameter of the first rear chamber; a first groove is arranged at the connection between the sealing step portion and the guide column portion, and the first sealing member is arranged in the first groove; the outer diameter of the first sealing member is larger than the inner diameter of the first convex ring and smaller than the inner diameter of the first rear chamber; the guide column portion passes through the first convex ring and enters the The first front chamber, the side surface of the first sealing member abuts against the first convex ring, so that the first front chamber is blocked from the first rear chamber, and a first seal is formed between the first front chamber and the first rear chamber; the outer diameter of the piston step portion is larger than the outer diameter of the sealing step portion, and the outer diameter of the piston step portion and the inner diameter of the first rear chamber are matched with each other as a piston; a second groove is provided on the outer diameter of the piston step portion, and the second sealing member is provided in the second groove; the guide column portion passes through the first convex ring and enters the first front chamber, and a second seal, namely a piston seal, is formed between the piston step portion, the second sealing member and the first rear chamber; One end of the compression spring is connected to the bottom of the piston step portion of the valve core shaft, and the other end is connected to the second convex ring.

2. The one-way valve with a double sealing structure according to claim 1, characterized in that: A first protrusion is arranged at the bottom of the piston step portion of the valve core shaft; one end of the compression spring is connected to the first protrusion, and the other end thereof is connected to the second protruding ring.

3. The one-way valve with a double sealing structure according to claim 1, characterized in that: It also includes a third sealing component; the inner wall of the second front chamber is provided with a first internal thread, the outer wall of the first rear chamber is provided with a first external thread matching the first internal thread, the bottom end of the first external thread is provided with a third groove, and the third sealing component is arranged in the third groove.

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