Magnetic pressure limiting valve

Abstract

A magnetic pressure limiting valve comprises an exhaust pipe and a fixing part arranged at the lower end of the exhaust pipe, and a valve body matched with the exhaust pipe is arranged over the exhaust pipe. An exhaust groove is formed in the center of the lower surface of the valve body, and the upper end of the exhaust pipe penetrates into the exhaust groove; a plurality of exhaust holes communicated with the exhaust groove are formed in the outer wall of the lower end of the valve body; a magnetic steel is arranged on the valve body; a telescopic hole is formed in the center of the magnetic steel; a magnetic field induction steel column is arranged in the telescopic hole; the lower end of the magnetic field induction steel column penetrates through the telescopic hole downwards and blocks and seals an upper end pipe opening of the exhaust pipe. The magnetic pressure-limiting valve not only can ensure the stability during pressure limiting, but also can ensure the sealing performance when the upper end of the exhaust pipe is sealed.

Description

Technical Field

[0001] The utility model relates to the field of pressure limiting valves, in particular to a magnetic pressure limiting valve. Background Art

[0002] A pressure limiting valve is a pressure limiting device used on a pressure cooker. When the pressure in the pressure cooker reaches the working pressure during the heating process, the pressure limiting valve exhausts gas through the exhaust hole to prevent the pressure from rising continuously, thereby achieving the purpose of cooking.

[0003] Traditional pressure limiting valves achieve pressure limitation by using the difference between the weight of the opening and closing member itself and the gas pressure discharged upward by the pressure cooker through the exhaust pipe. When the pressure cooker exhausts gas upward through the exhaust pipe, the gas pressure will push the opening and closing member upward. As the opening and closing member moves upward along the trajectory of the telescopic hole in the pressure limiting valve, the upper end opening of the exhaust pipe opens, enabling the gas pressure in the pressure cooker to finally be discharged through the exhaust hole. When the pressure cooker does not exhaust gas, the opening and closing member will fall under the action of its own gravity, blocking the upper end opening of the exhaust pipe. This structural design causes the outer wall of the opening and closing member to easily rub against the inner wall of the telescopic hole when the opening and closing member moves up and down. The existence of friction will affect the accuracy of the stroke when the opening and closing member moves up and down, making it impossible to ensure the working pressure value required for the upper end of the exhaust pipe to open, thus unable to ensure the stability during pressure limitation. Moreover, as the outer wall of the opening and closing member wears, the gap between the outer wall of the opening and closing member and the inner wall of the telescopic hole becomes larger, and the opening and closing member is prone to tilting, unable to ensure the sealing performance of the opening and closing member for sealing the upper end of the exhaust pipe. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a magnetic pressure limiting valve, which can not only ensure the stability during pressure limitation but also ensure the sealing performance when the upper end of the exhaust pipe is sealed.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] The utility model discloses a magnetic pressure limiting valve, which includes an exhaust pipe and a fixing part arranged at the lower end of the exhaust pipe. A valve body matching the exhaust pipe is arranged directly above the exhaust pipe. A discharge groove is arranged at the center of the lower surface of the valve body, and the upper end of the exhaust pipe penetrates into the discharge groove. A plurality of exhaust holes communicating with the discharge groove are arranged on the outer wall at the lower end of the valve body. A magnetic steel is arranged on the valve body. A telescopic hole is arranged at the center of the magnetic steel. A magnetic field induction steel column is arranged in the telescopic hole. The lower end of the magnetic field induction steel column passes through the telescopic hole downward and blocks and seals the upper end opening of the exhaust pipe.

[0007] A magnetic steel installation groove is arranged at the center of the bottom of the discharge groove. The magnetic steel is arranged in the magnetic steel installation groove.

[0008] A positioning structure matching the magnetic steel is arranged on the exhaust pipe, and the positioning structure can adsorb the valve body on the exhaust pipe.

[0009] The positioning structure includes a positioning seat provided on the outer wall of the upper part of the exhaust pipe; an annular suction positioning groove is provided on the upper surface of the positioning seat, and the suction positioning groove faces the magnet; a steel ring matching the suction positioning groove is provided in the suction positioning groove.

[0010] The edge of the upper side notch of the suction positioning groove is press riveted and attached to the upper surface of the steel ring; the edge of the lower side notch of the magnet installation groove is press riveted and attached to the lower surface of the magnet.

[0011] An annular sealing step is provided on the outer wall of the positioning seat, and the sealing step is lower than the upper surface of the positioning seat; the lower surface of the valve body is attached to the sealing step; a guiding conical surface with a narrow upper part and a wide lower part is provided on the outer wall of the positioning seat.

[0012] A upper hole is provided at the center of the upper surface of the valve body; a lower hole communicating with the upper hole is provided at the center of the bottom of the magnet installation groove; the diameter of the lower hole is larger than that of the upper hole, and the diameter of the magnetic field induction steel column is larger than that of the upper hole; the upper end of the magnetic field induction steel column penetrates upward into the lower hole, and there is a gap between the inner wall of the lower hole and the outer wall of the magnetic field induction steel column.

[0013] An auxiliary conical surface with a narrow upper part and a wide lower part is provided on the inner wall of the lower end orifice of the telescopic hole.

[0014] The upper end orifice of the exhaust pipe has a sealing conical surface with a wide upper part and a narrow lower part.

[0015] A sphere receiving groove is provided on the lower end surface of the magnetic field induction steel column; a sphere is placed in the sphere receiving groove; the lower end of the sphere protrudes downward out of the sphere receiving groove and is attached to the sealing conical surface.

[0016] The beneficial effects of the present utility model are as follows:

[0017] Compared with the prior art, in the magnetic force pressure limiting valve adopting the structure of the present utility model, the magnetic field induction steel column is adsorbed in the telescopic hole by the magnetic field of the magnet. The outer wall of the magnetic field induction steel column is not in close contact with the inner wall of the telescopic hole, but is positioned in the telescopic hole under the action of the magnetic field of the magnet. Therefore, under the attraction of the magnetic field of the magnet, when the magnetic field induction steel column is subjected to air pressure, it can smoothly expand and contract in the telescopic hole, so as to ensure that the magnetic field induction steel column will not be interfered by other factors when subjected to air pressure. Once the working pressure value required for opening the upper end orifice of the exhaust pipe is reached, the magnetic field induction steel column will move up to the actual required position, achieving the effect of pressure limiting. This moving mode effectively avoids the situation that the outer wall of the magnetic field induction steel column is worn due to frequent friction, and effectively ensures the sealing performance when the magnetic field induction steel column moves down and resets to block and seal the upper end orifice of the exhaust pipe. Description of the Drawings

[0018] Figure 1 It is a sectional view of the magnetic force pressure limiting valve of the present utility model. Detailed implementation mode

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes:

[0020] Please refer to Figure 1 , the utility model provides a magnetic pressure limiting valve, which includes an exhaust pipe 1 and a fixing part 2 arranged at the lower end of the exhaust pipe 1. A valve body 3 matching the exhaust pipe 1 is arranged directly above the exhaust pipe 1; a exhaust groove 4 is arranged at the center of the lower surface of the valve body 3, and the upper end of the exhaust pipe 1 penetrates into the exhaust groove 4; several exhaust holes 5 communicating with the exhaust groove 4 are arranged on the outer wall of the lower end of the valve body 3; a magnet 6 is arranged on the valve body 3; a telescopic hole 7 is arranged at the center of the magnet 6; a magnetic field induction steel column 8 is arranged in the telescopic hole 7; the lower end of the magnetic field induction steel column 8 penetrates downward through the telescopic hole 7 and blocks and seals the upper end pipe orifice of the exhaust pipe 1.

[0021] A magnet installation groove 9 is arranged at the center of the bottom of the exhaust groove 4; the magnet 6 is arranged in the magnet installation groove 9.

[0022] A positioning structure matching the magnet 6 is arranged on the exhaust pipe 1, and the positioning structure can adsorb the valve body on the exhaust pipe 1.

[0023] The positioning structure includes a positioning seat 10 arranged on the outer wall of the upper part of the exhaust pipe 1; an annular suction positioning groove 11 is arranged on the upper surface of the positioning seat 10, and the suction positioning groove 11 faces the magnet 6; a steel ring 12 matching the suction positioning groove 11 is arranged in the suction positioning groove 11.

[0024] The edge of the upper side slot opening of the suction positioning groove 11 is press-fitted on the upper surface of the steel ring 12; the edge of the lower side slot opening of the magnet installation groove 9 is press-fitted on the lower surface of the magnet 6.

[0025] An annular sealing step 13 is arranged on the outer wall of the positioning seat 10, and the sealing step 13 is lower than the upper surface of the positioning seat 10; the lower surface of the valve body 3 is attached to the sealing step 13; a guiding conical surface 14 with a narrow upper part and a wide lower part is arranged on the outer wall of the positioning seat 10.

[0026] An upper hole 15 is arranged at the center of the upper surface of the valve body 3; a lower hole 16 communicating with the upper hole 15 is arranged at the center of the bottom of the magnet installation groove 9; the diameter of the lower hole 16 is larger than the diameter of the upper hole 15, and the diameter of the magnetic field induction steel column 8 is larger than the diameter of the upper hole 15; the upper end of the magnetic field induction steel column 8 penetrates upward into the lower hole 16, and there is a gap between the inner wall of the lower hole 16 and the outer wall of the magnetic field induction steel column 8.

[0027] An auxiliary conical surface 17 with a narrow upper part and a wide lower part is arranged on the inner wall of the lower end hole orifice of the telescopic hole 7.

[0028] The upper end pipe orifice of the exhaust pipe 1 has a sealing conical surface 18 with a wide upper part and a narrow lower part.

[0029] A spherical body receiving groove 19 is provided on the lower end surface of the magnetic field induction steel column 8; a spherical body 20 is placed in the spherical body receiving groove 19; the lower end of the spherical body 20 protrudes downward out of the spherical body receiving groove 19 and fits with the sealing conical surface 18.

[0030] The usage method of the utility model is as follows:

[0031] When high-pressure gas is generated during the use of the pressure cooker, the gas will be discharged upward through the exhaust pipe 1 on the pot cover 21. At this time, the high-pressure gas will push the magnetic field induction steel column 8 upward, so as to realize the upward movement of the magnetic field induction steel column 8. Since the magnetic field induction steel column 8 is in the telescopic hole 7 at the center of the magnetic steel 6, under the influence of the magnetic field of the magnetic steel 6, the magnetic field induction steel column 8 will still be attracted by the magnetic field after moving. When the external force is removed, the magnetic field induction steel column 8 will automatically reset under the action of the magnetic field and block and seal the upper end opening of the exhaust pipe 1.

[0032] As can be seen from the above, the utility model adsorbs the magnetic field induction steel column 8 in the telescopic hole 7 through the magnetic field of the magnetic steel 6. The outer wall of the magnetic field induction steel column 8 does not closely fit with the inner wall of the telescopic hole 7, but is positioned in the telescopic hole 7 under the action of the magnetic field of the magnetic steel 6. Therefore, under the attraction of the magnetic field of the magnetic steel 6, when the magnetic field induction steel column 8 is subjected to air pressure, it can smoothly expand and contract in the telescopic hole 7, so as to ensure that the magnetic field induction steel column 8 will not be interfered by other factors when subjected to air pressure. Once the working pressure value required for opening the upper end opening of the exhaust pipe 1 is reached, the magnetic field induction steel column 8 will move up to the actual required position, playing a pressure limiting effect. This moving method effectively avoids the situation that the outer wall of the magnetic field induction steel column 8 is worn due to frequent friction, and effectively ensures the sealing performance when the magnetic field induction steel column 8 moves down and resets to block and seal the upper end opening of the exhaust pipe 1.

[0033] The positioning structure includes a positioning seat 10 provided on the outer wall of the upper part of the exhaust pipe 1. An annular suction positioning groove 11 is provided on the upper surface of the positioning seat 10. The suction positioning groove 11 faces the magnetic steel 6. A steel ring 12 matching with it is provided in the suction positioning groove 11. The steel ring 12 and the magnetic steel 6 attract each other to generate a suction force. This suction force can firmly fit the surface of the valve body 3 on the sealing step 13, effectively ensuring the sealing performance between the lower surface of the valve body 3 and the sealing step 13. The suction force between the magnetic steel 6 and the steel ring 12 is greater than the pressure of the gas discharged upward by the pressure cooker through the exhaust pipe 1. Therefore, there is no need to worry about the valve body falling off when the exhaust pipe 1 exhausts, ensuring the stability and safety during exhaust.

[0034] The lower surface of the valve body 3 fits with the sealing step 13; a guiding conical surface 14 with a narrow upper part and a wide lower part is provided on the outer wall of the positioning seat 10. The existence of the guiding conical surface 14 facilitates the positioning seat to be clamped into the exhaust groove 4 along with the exhaust pipe 1, effectively improving the assembly efficiency.

[0035] The edge of the upper notch of the suction and positioning groove 11 is press riveted and fitted to the upper surface of the steel ring 12, and the edge of the lower notch of the magnet installation groove 9 is press riveted and fitted to the lower surface of the magnet 6. This fixing method not only facilitates the initial assembly of the magnet 6 and the steel ring 12, but also ensures the stability of the magnet 6 and the steel ring 12 in the later stage, effectively avoiding the situation that the magnet 6 detaches from the magnet installation groove 9 under the suction force between itself and the steel ring 12, and effectively avoiding the situation that the steel ring 12 detaches from the suction and positioning groove 11 under the suction force between itself and the magnet 6.

[0036] A upper hole 15 is provided at the center of the upper surface of the valve body 3, and a lower hole 16 communicating with the upper hole 15 is provided at the center of the bottom of the magnet installation groove 9. The diameter of the lower hole 16 is larger than that of the upper hole 15. The upper end of the magnetic field induction steel column 8 penetrates upward into the lower hole 16. There is a gap between the inner wall of the lower hole 16 and the outer wall of the magnetic field induction steel column 8. The gap between the inner wall of the lower hole 16 and the magnetic field induction steel column 8 and the existence of the upper hole 15 are conducive to the normal flow of gas. This structural design can effectively avoid the situation that the space above the magnetic field induction steel column 8 is squeezed and the internal pressure increases when the magnetic field induction steel column 8 moves upward, thereby effectively avoiding the situation that the air pressure above the magnetic field induction steel column 8 increases when the magnetic field induction steel column 8 moves upward and the magnetic field induction steel column 8 cannot move upward normally. Moreover, the diameter of the magnetic field induction steel column 8 is larger than that of the upper hole 15. When the magnetic field induction steel column 8 moves upward to the bottom of the lower hole 16, it will be restricted by the bottom of the lower hole 16 from continuing to move upward, thereby effectively avoiding the situation that the magnetic field induction steel column 8 moves upward excessively and detaches from the telescopic hole 7.

[0037] An auxiliary conical surface 17 with a narrow upper part and a wide lower part is provided on the inner wall of the lower end orifice of the telescopic hole 7. The existence of the auxiliary conical surface 17 can reduce the actual contact area between the outer wall of the magnetic field induction steel column 8 and the inner wall of the telescopic hole 7, and improve the smoothness when the magnetic field induction steel column 8 moves along the track of the telescopic hole 7.

[0038] The upper end orifice of the exhaust pipe 1 has a sealing conical surface 18 with a wide upper part and a narrow lower part. When the lower end of the magnetic field induction steel column 8 directly seals the upper end orifice of the exhaust pipe 1, as long as the edge of the lower end surface of the magnetic field induction steel column 8 fits with the sealing conical surface 18, the upper end orifice of the exhaust pipe 1 can be blocked. When sealed by the sphere 20, the existence of the sealing conical surface 18 is more conducive to quickly blocking and sealing the upper end orifice of the exhaust pipe 1 when the sphere 20 moves downward and resets.

Claims

1. A magnetic pressure limiting valve, comprising an exhaust pipe and a fixing portion arranged at the lower end of the exhaust pipe, characterized in that: A valve body matching the exhaust pipe is provided directly above the exhaust pipe; an exhaust groove is provided at the center of the lower surface of the valve body, and the upper end of the exhaust pipe is inserted into the exhaust groove; a plurality of exhaust holes in communication with the exhaust groove are provided on the outer wall of the lower end of the valve body; a magnet is provided on the valve body; a telescopic hole is provided at the center of the magnet; a magnetic field induction steel column is provided in the telescopic hole; the lower end of the magnetic field induction steel column passes downward through the telescopic hole and blocks and seals the pipe opening at the upper end of the exhaust pipe.

2. A magnetic pressure limiting valve according to claim 1, characterized in that: A magnetic steel installation groove is provided at the center of the bottom of the exhaust groove; the magnetic steel is arranged in the magnetic steel installation groove.

3. A magnetic pressure limiting valve according to claim 2, characterized in that: The exhaust pipe is provided with a positioning structure matching the magnetic steel, and the positioning structure can adsorb the valve body on the exhaust pipe.

4. A magnetic pressure limiting valve according to claim 3, characterized in that: The positioning structure includes a positioning seat arranged on the upper outer wall of the exhaust pipe; an annular suction positioning groove is arranged on the upper surface of the positioning seat, and the suction positioning groove is opposite to the magnetic steel; a steel ring matching with the suction positioning groove is arranged in the suction positioning groove.

5. A magnetic pressure limiting valve according to claim 4, characterized in that: The upper notch edge of the suction positioning groove is fitted on the upper surface of the steel ring by riveting; the lower notch edge of the magnetic steel installation groove is fitted on the lower surface of the magnetic steel by riveting.

6. A magnetic pressure limiting valve according to claim 4, characterized in that: The outer wall of the positioning seat is provided with an annular sealing step, which is lower than the upper surface of the positioning seat; the lower surface of the valve body is in contact with the sealing step; the outer wall of the positioning seat is provided with a guiding cone surface which is narrow at the top and wide at the bottom.

7. A magnetic pressure limiting valve according to claim 2, characterized in that: An upper hole is provided at the center of the upper surface of the valve body; a lower hole is provided at the center of the bottom of the magnetic steel installation groove and is connected with the upper hole; the diameter of the lower hole is larger than the diameter of the upper hole, and the diameter of the magnetic field induction steel column is larger than the diameter of the upper hole; the upper end of the magnetic field induction steel column is inserted upward into the lower hole, and there is a gap between the inner wall of the lower hole and the outer wall of the magnetic field induction steel column.

8. The magnetic pressure limiting valve according to claim 1, characterized in that: An auxiliary conical surface which is narrow at the top and wide at the bottom is arranged on the inner wall of the opening at the lower end of the telescopic hole.

9. The magnetic pressure limiting valve according to claim 1, characterized in that: The pipe opening at the upper end of the exhaust pipe has a sealing cone surface which is wide at the top and narrow at the bottom.

10. A magnetic pressure limiting valve according to claim 9, characterized in that: The lower end surface of the magnetic field sensing steel column is provided with a ball receiving groove; a ball is placed in the ball receiving groove; the lower end of the ball protrudes downward to the outside of the ball receiving groove and fits with the sealing cone surface.

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