Needle valve

Abstract

The utility model belongs to the technical field of needle valves, and particularly relates to a needle valve which comprises a shell, a piston seat slidably connected in the shell, a valve needle fixed in the middle of the piston seat, an end cover fixedly embedded in the upper portion of the shell, and a spring connected between the upper end of the piston seat and the top end in the end cover. An iron cover is in threaded connection with the upper portion of the valve needle, a ventilation cavity is formed in the middle of the upper end of the end cover, an electromagnet is fixed in the ventilation cavity, and the iron cover is located in the ventilation cavity, located below the electromagnet and matched with the electromagnet. When the needle valve is normally used, the needle valve is externally connected with an air pump assembly through the air hole, air can be conveyed into the shell, the piston seat is pushed to move upwards along the air hole, the piston seat drives the valve needle to move upwards, and the needle valve is opened, and if the air pump assembly cannot be used, the electromagnet is powered on, the iron cover is attracted to move upwards, and the iron cover drives the valve needle to move upwards to open the needle valve. According to the two needle valve opening modes, when one of the two needle valve opening modes is damaged, the needle valve can be normally used.

Description

Technical Field

[0001] The utility model belongs to the technical field of needle valves, and in particular relates to a needle valve. Background Art

[0002] The needle valve is a fine-tuning valve with a needle-shaped valve plug, which is mainly used to adjust the air flow. The fine-tuning valve requires the valve opening to gradually increase, and can be adjusted continuously and finely from closed to open. The needle valve plug can achieve this function. Some of the needle valves nowadays use air pressure to push the piston upward, such as the striker valve. This way of opening the needle valve is relatively simple. If the air pump is damaged, the needle valve cannot be used, resulting in a relatively simple opening method. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a needle valve to solve the problem that some of the current needle valves use air pressure to push the piston upward, such as a striker valve. This way of opening the needle valve is relatively single. If the air pump is damaged, the needle valve cannot be used, resulting in a relatively single opening method.

[0004] A needle valve comprises a shell, a piston seat is slidably connected inside the shell, a valve needle is fixed in the middle of the piston seat, an end cover is embedded and fixed on the upper part of the shell, and a spring is connected between the upper end of the piston seat and the top end of the end cover;

[0005] The upper part of the valve needle is threadedly connected with an iron cover, the middle part of the upper end of the end cover is provided with a ventilation cavity, an electromagnet is fixed inside the ventilation cavity, the iron cover is located in the ventilation cavity, and the iron cover is located below the electromagnet and cooperates with the electromagnet.

[0006] Specifically, an end face sealing ring is embedded and installed on the outer side of the lower end of the shell, a plastic ring is embedded and installed in the middle of the lower end of the shell, a sealing ring mounting seat is installed on the upper part of the plastic ring, and a gasket is provided between the sealing ring mounting seat and the plastic ring.

[0007] Specifically, an outer sealing ring is installed outside the sealing ring mounting seat, the outer sealing ring is in contact with the inner wall of the shell, an inner sealing ring is installed inside the sealing ring mounting seat, and the valve needle is movably interlaced with the inner sealing ring, the sealing ring mounting seat, the gasket and the plastic ring.

[0008] Specifically, a limit block is fixed inside the shell and above the sealing ring mounting seat, a vent is provided on the outside of the limit block, the limit block is located below the piston seat, an air hole is provided below the side of the shell, the air hole is located below the limit block and communicates with the vent.

[0009] Specifically, a screw head is provided at the upper end of the valve needle, a thread groove is provided at the lower end of the iron cover, and the screw head is located inside the thread groove and is threadably connected to the thread groove.

[0010] Specifically, a plurality of fixing rods are fixed between the electromagnet and the inner wall of the ventilation cavity.

[0011] Beneficial effect: When the needle valve is used normally, the air pump assembly is connected to the outside through the air hole, and air can enter the inside of the shell through the air supply, and push the piston seat upward along the air hole. The piston seat drives the valve needle upward to open the needle valve. If the air pump assembly cannot be used, the electromagnet is energized to suck the iron cover upward. At this time, the iron cover drives the valve needle upward to open the needle valve. These two ways of opening the needle valve can be used when one of them is damaged, and the needle valve can also be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall schematic diagram of the utility model;

[0013] Figure 2 For this utility model Figure 1 A partial schematic diagram of;

[0014] Figure 3 It is a bottom view schematic diagram of the ventilation cavity of the utility model.

[0015] In the figure: 1-housing, 2-end face sealing ring, 3-plastic ring, 4-valve needle, 5-gasket, 6-outer sealing ring, 7-inner sealing ring, 8-sealing ring mounting seat, 9-limiting block, 10-piston seat, 11-spring, 12-end cover, 13-air hole, 14-screw head, 15-iron cover, 16-venting cavity, 17-electromagnet, 18-fixing rod. DETAILED DESCRIPTION

[0016] See also Figure 1-Figure 3A needle valve comprises a shell 1, wherein a piston seat 10 is slidably connected inside the shell 1, a valve needle 4 is fixed in the middle of the piston seat 10, an end cover 12 is embedded and fixed in the upper part of the shell 1, a spring 11 is connected between the upper end of the piston seat 10 and the top end inside the end cover 12, an iron cover 15 is threadedly connected to the upper part of the valve needle 4, a screw head 14 is provided at the upper end of the valve needle 4, a thread groove is provided at the lower end of the iron cover 15, the screw head 14 is located inside the thread groove and is threadedly connected to the thread groove, a ventilation cavity 16 is provided in the middle of the upper end of the end cover 12, an electromagnet 17 is fixed inside the ventilation cavity 16, and the electromagnet 17 is connected to the ventilation cavity A plurality of fixing rods 18 are fixed between the inner walls of the air cavity 16, and the iron cover 15 is located in the ventilation cavity 16. The iron cover 15 is located below the electromagnet 17 and cooperates with the electromagnet 17. Because the electromagnet 17 is externally connected to a power supply and a switch, when the electromagnet 17 is energized and started, the electromagnet 17 is magnetic and attracts the iron cover 15 to move upward, and the iron cover 15 drives the valve needle 4 to move upward through the screw head 14, and the valve needle 4 drives the piston seat 10 to move upward and squeeze the spring 11, thereby opening the needle valve. When the electromagnet 17 is powered off and loses its magnetism, the piston seat 10 can be pushed down and reset by the spring 11 to close the needle valve again.

[0017] An end face sealing ring 2 is embedded and installed on the outer side of the lower end of the shell 1, and a plastic ring 3 is embedded and installed in the middle of the lower end of the shell 1. A sealing ring mounting seat 8 is installed on the upper part of the plastic ring 3, and a gasket 5 is provided between the sealing ring mounting seat 8 and the plastic ring 3. An outer sealing ring 6 is installed on the outside of the sealing ring mounting seat 8, and the outer sealing ring 6 is in contact with the inner wall of the shell 1. An inner sealing ring 7 is installed on the inner side of the sealing ring mounting seat 8. The valve needle 4 and the inner sealing ring 7, the sealing ring mounting seat 8, the gasket 5 and the plastic ring 3 are movably interspersed. By arranging the end face sealing ring 2, the sealing performance between the shell 1 and the installation part can be improved, and by using the outer sealing ring 6, the sealing performance between the sealing ring mounting seat 8 and the inner wall of the shell 1 can be improved, and then by using the inner sealing ring 7, the sealing performance between the valve needle 4 and the sealing ring mounting seat 8 can be improved.

[0018] A limit block 9 is fixed inside the shell 1 and above the sealing ring mounting seat 8, a vent is provided on the outside of the limit block 9, the limit block 9 is located below the piston seat 10, and an air hole 13 is provided at the lower side of the shell 1, the air hole 13 is located below the limit block 9 and communicates with the vent. Because the air hole 13 is externally connected to an air pump assembly, when the air pump assembly inputs air into the shell 1 through the air hole 13, the air can push the piston seat 10 upward through the air hole and squeeze the spring 11. At this time, the piston seat 10 drives the valve needle 4 to move upward, and the needle valve is in an open state. When the air pump assembly no longer inputs air into the shell 1 through the air hole 13, the spring 11 bounces the piston seat 10 downward and resets, and the piston seat 10 drives the valve needle 4 downward and resets, so that the needle valve is closed.

[0019] To sum up, when the needle valve is used normally, the air pump assembly is connected to the outside through the air hole 13, and the air can enter the interior of the shell 1 through the air supply, and push the piston seat 10 upward along the air hole, and the piston seat 10 drives the valve needle 4 to move upward to open the needle valve. If the air pump assembly cannot be used, the electromagnet 17 is energized to attract the iron cover 15 to move upward. At this time, the iron cover 15 drives the valve needle 4 to move upward to open the needle valve. These two ways of opening the needle valve can be used when one of them is damaged, and the needle valve can also be used normally.

Claims

1. A needle valve, comprising a housing (1), a piston seat (10) being slidably connected inside the housing (1), a valve needle (4) being fixed in the middle of the piston seat (10), an end cover (12) being embedded and fixed in the upper part of the housing (1), a spring (11) being connected between the upper end of the piston seat (10) and the top end inside the end cover (12), characterized in that: The upper part of the valve needle (4) is threadedly connected to an iron cover (15); a ventilation cavity (16) is provided in the middle of the upper end of the end cover (12); an electromagnet (17) is fixed inside the ventilation cavity (16); the iron cover (15) is located in the ventilation cavity (16); the iron cover (15) is located below the electromagnet (17) and cooperates with the electromagnet (17).

2. A needle valve according to claim 1, characterized in that: An end face sealing ring (2) is embedded and installed on the outer side of the lower end of the shell (1), a plastic ring (3) is embedded and installed in the middle of the lower end of the shell (1), a sealing ring mounting seat (8) is installed on the upper part of the plastic ring (3), and a gasket (5) is provided between the sealing ring mounting seat (8) and the plastic ring (3).

3. A needle valve according to claim 2, characterized in that: An outer sealing ring (6) is installed on the outside of the sealing ring mounting seat (8), the outer sealing ring (6) is in contact with the inner wall of the housing (1), an inner sealing ring (7) is installed on the inside of the sealing ring mounting seat (8), and the valve needle (4) is movably interlaced with the inner sealing ring (7), the sealing ring mounting seat (8), the gasket (5) and the plastic ring (3).

4. A needle valve according to claim 3, characterized in that: A limit block (9) is fixed inside the housing (1) and located above the sealing ring mounting seat (8); a vent hole is provided on the outside of the limit block (9); the limit block (9) is located below the piston seat (10); and an air hole (13) is provided below the side of the housing (1); the air hole (13) is located below the limit block (9) and communicates with the vent hole.

5. A needle valve according to claim 1, characterized in that: A screw head (14) is provided at the upper end of the valve needle (4), a thread groove is provided at the lower end of the iron cover (15), and the screw head (14) is located inside the thread groove and is threadably connected to the thread groove.

6. A needle valve according to claim 1, characterized in that: A plurality of fixing rods (18) are fixed between the electromagnet (17) and the inner wall of the ventilation cavity (16).

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