Mechanical low-pressure closure safety device

Abstract

The utility model relates to the technical field of gas pipelines, and discloses a mechanical low-pressure closure safety device which comprises a pipe body, a spring and a ball are arranged in the pipe body, a limiting hole is formed in the pipe body in the axial direction in a penetrating mode, and the limiting hole sequentially comprises a first limiting part, a second limiting part and an installation part in the gas inlet direction. A transition part is arranged between the first limiting part and the second limiting part, the diameter of the first limiting part is smaller than that of the second limiting part, one end of the spring is fixed in the second limiting part, the other end of the spring is connected with the ball, the diameter of the ball is matched with the inner diameter of the second limiting part, and the diameter of the ball is matched with the inner diameter of the second limiting part. And the radian of the transition part is matched with that of the ball, so that sealing is realized.

Description

Technical Field

[0001] This utility model relates to the field of gas pipeline technology, and in particular to a mechanical low-pressure shut-off safety device. Background Technology

[0002] In indoor and outdoor gas appliances such as gas dryers and heaters, when accidents occur or the system is unstable, a small amount of gas may enter the gas appliance when the gas pressure in the gas pipeline is low. Since the combustion rate of indoor and outdoor gas appliances such as gas dryers and heaters is relatively high, if the flame combustion speed is greater than the gas output speed, the fire at the combustion point will spread towards the gas source through the pipeline, causing a backfire phenomenon in the gas pipeline. In view of this, those skilled in the art have designed a simple mechanical low-pressure interception safety device. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a mechanical low-pressure shut-off safety device.

[0004] The technical solution of this utility model is as follows: a mechanical low-pressure shut-off safety device, comprising a pipe body, a spring and a ball bearing disposed within the pipe body, a limiting hole extending axially through the pipe body, the limiting hole comprising a first limiting part, a second limiting part and a mounting part sequentially along the air inlet direction, a transition part disposed between the first limiting part and the second limiting part, the diameter of the first limiting part being smaller than the diameter of the second limiting part, one end of the spring being fixed inside the second limiting part, and the other end being connected to the ball bearing, the diameter of the ball bearing being adapted to the inner diameter of the second limiting part, and the curvature of the transition part being adapted to the curvature of the ball bearing, thereby achieving a seal.

[0005] As can be seen from the above scheme, the tube body is used for air intake through the limiting hole, the ball bearing is used to adapt the diameter of the ball bearing to the inner diameter of the second limiting part in the tube body when the airflow passes through, and the spring is used to limit the ball bearing to the transition part through the elastic force to achieve the limiting, so as to block the through hole in the tube body, thereby achieving the cut-off of the airflow, and the gas enters to squeeze the spring to achieve the flow of gas.

[0006] The pipe body includes an integrally formed pipe body and an air intake pipe body. The diameter of the air intake pipe body is smaller than the diameter of the pipe body, and the first limiting part is disposed in the air intake pipe body.

[0007] The tube body is connected to an installation head via the installation part. The installation head includes an integrally formed first connecting part and a second connecting part. The second connecting part is inserted into the installation part and connected to the installation part. The diameter of the first connecting part is larger than the diameter of the second connecting part. A connecting through hole is provided through the installation head, and the connecting through hole communicates with the limiting hole.

[0008] The mounting head is provided with an external thread, and the mounting head is threadedly connected to a connector. The connector has a through-hole for air venting. The mounting head is connected to the pipe body and the connector respectively.

[0009] The pipe body is connected to a gas source via a first gas pipe, and the connector is connected to a combustion device via a second gas pipe. Therefore, the air inlet is used to connect to the gas source for air intake, and the air outlet is used to discharge air to the combustion device for combustion.

[0010] A limiting ring groove is provided between the first connecting part and the second connecting part.

[0011] The balls are made of solid steel. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is an exploded view of this utility model;

[0014] Figure 3 This is an exploded view of this utility model;

[0015] Figure 4 This is a connection diagram of this utility model. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] like Figures 1 to 4As shown, this utility model is a mechanical low-pressure shut-off safety device, including a pipe body 1. A spring 2 and a ball bearing 3 are disposed inside the pipe body 1. A limiting hole is formed through the pipe body 1 along the axial direction. The limiting hole includes a first limiting part 13, a second limiting part 14, and a mounting part 15 in sequence along the air inlet direction. A transition part 10 is provided between the first limiting part 13 and the second limiting part 14. The diameter of the first limiting part 13 is smaller than the diameter of the second limiting part 14. One end of the spring 2 is fixed inside the second limiting part 14, and the other end is connected to the ball bearing 3. The diameter of the ball bearing 3 is adapted to the inner diameter of the second limiting part 14. The ball bearing 3 is made of solid steel ball. The curvature of the transition part 10 is adapted to the curvature of the ball bearing 3, thereby achieving a seal in the limiting hole.

[0018] The pipe body 1 includes an integrally formed pipe body 11 and an air intake pipe body 12. The diameter of the air intake pipe body 12 is smaller than the diameter of the pipe body 11, and the first limiting part 13 is disposed inside the air intake pipe body 12.

[0019] The tube body 1 is connected to the mounting head 4 via the mounting part 15. The mounting head 4 includes an integrally formed first connecting part 41 and a second connecting part 42. The second connecting part 42 is inserted into the mounting part 15 and connected to the mounting part 15. The diameter of the first connecting part 41 is larger than the diameter of the second connecting part 42. A connecting through hole 43 is provided through the mounting head 4. The connecting through hole 43 communicates with the limiting hole. A limiting annular groove 44 is provided between the first connecting part 41 and the second connecting part 42.

[0020] The mounting head 4 is provided with an external thread, and the mounting head 4 is threadedly connected to a connector 5. The connector 5 is provided with a through-hole 51. The mounting head 4 is connected to the pipe body 1 and the connector 5 respectively. The pipe body 1 is connected to the gas source 20 through the first gas pipe 30, and the connector 5 is connected to the combustion device 40 through the second gas pipe 50.

[0021] The working process of this utility model is as follows: When the gas flow rate entering the limiting hole is small, it is difficult to push the ball 3 to squeeze the spring 2, so that the ball 3 and the transition part 10 fit tightly to achieve a seal, thereby closing the air intake channel and preventing gas from entering the combustion device 40 when the gas flow rate is small, thus preventing backfire caused by the flame combustion speed being greater than the gas outlet speed. After sufficient gas is introduced, the gas pressure pushes the ball 3 to squeeze the spring 2, thereby pushing the ball 3 toward the second limiting part 14, so that the air intake channel is opened, and the gas flows through the limiting part 13, the second limiting part 14 and the mounting part 15 in sequence in the limiting hole and then enters the combustion device 40 through the connector 5 for full combustion.

[0022] Finally, it should be emphasized that the above description is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical low pressure intercepting safety device comprising a tube (1), characterized in that: The pipe body (1) is provided with a spring (2) and a ball (3) inside, a limiting hole is provided in the pipe body (1) and penetrates along the axial direction, the limiting hole includes a first limiting part (13), a second limiting part (14) and a mounting part (15) in sequence along the air inlet direction, a transition part (10) is arranged between the first limiting part (13) and the second limiting part (14), the diameter of the first limiting part (13) is smaller than the diameter of the second limiting part (14), one end of the spring (2) is fixed in the second limiting part (14), the other end is connected with the ball (3), the diameter of the ball (3) is matched with the inner diameter of the second limiting part (14), and the curvature of the transition part (10) is matched with the curvature of the ball (3), so that sealing is realized.

2. A mechanical low pressure shut-off safety device according to claim 1, characterized in that: The pipe body (1) includes an integrally formed pipe body (11) and an air inlet pipe body (12), the diameter of the air inlet pipe body (12) is smaller than the diameter of the pipe body (11), and the first limiting part (13) is arranged in the air inlet pipe body (12).

3. A mechanical low pressure shut-off safety device according to claim 1, characterized in that: The pipe body (1) is connected with a mounting head (4) through the mounting part (15), the mounting head (4) includes integrally formed first and second connecting parts (41) and (42), the second connecting part (42) is inserted into the mounting part (15) and connected with the mounting part (15), the diameter of the first connecting part (41) is greater than the diameter of the second connecting part (42), and a connecting through hole (43) is provided in the mounting head (4) and communicates with the limiting hole.

4. A mechanical low pressure shut-off safety device according to claim 3, characterized in that: The mounting head (4) is provided with external threads, a connecting piece (5) is threadedly connected with the mounting head (4), the connecting piece (5) is provided with an air outlet hole (51) penetrating therethrough, and the mounting head (4) communicates with the pipe body (1) and the connecting piece (5) respectively.

5. A mechanical low pressure shut-off safety device according to claim 4, characterized in that: The pipe body (1) communicates with a gas source (20) through a first air pipe (30), and the connecting piece (5) communicates with a combustion device (40) through a second air pipe (50).

6. A mechanical low pressure shut-off safety device according to claim 3, characterized in that: A limiting ring groove (44) is arranged between the first connecting part (41) and the second connecting part (42).

7. A mechanical low pressure shut-off safety device according to claim 1, characterized in that: The ball (3) is a solid steel ball.

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