Step-by-step direct-acting electromagnetic valve capable of running reversely at low temperature

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a step-by-step direct-acting electromagnetic valve capable of running reversely at low temperature. Comprising a valve body, a valve cover, a valve core and an electromagnetic coil, a circular clamping pad is arranged on the lower side of the diaphragm piece, a sealing pressing piece is arranged in the center of the upper side of the diaphragm piece, and a columnar pilot nozzle penetrates through the center of the diaphragm piece to clamp and fix the diaphragm piece and the sealing pressing piece; a conical valve cover is arranged on the diaphragm piece, and the valve body, the diaphragm piece and the valve cover are pressed and fixed through bolts; a blind pipe is arranged in the center of the top end of the valve cover, an electromagnetic coil is fixedly sleeved outside the blind pipe, an electromagnetic valve core is columnar and is sleeved in a central circular pipe at the top end of the valve cover, a blind hole is formed in the center of the upper end of the valve core, and a small spring is arranged in the blind hole; and a tension spring is fixed on the outer side of the valve core, and the other end of the tension spring is fixed on the side surface of the pilot nozzle. The center of the pilot nozzle is provided with an inner hole, and the upper end of the pilot nozzle is conical. A steel ball is arranged in an inner hole of the pilot nozzle, a steel wire at the lower end of the pilot nozzle is fixedly welded with the pilot nozzle, and a balance hole is arranged on the diaphragm. The balance hole is smaller than the pilot small hole in diameter.

Description

TECHNICAL FIELD

[0001] The utility model relates to solenoid valve technical field especially relates to a kind of low-temperature reverse operation's step-by-step direct acting solenoid valve. BACKGROUND

[0002] The step-by-step direct acting solenoid valve in current market can operate under normal temperature environment, since diaphragm is made of rubber, in low-temperature environment, diaphragm elasticity drops, leading to insufficient solenoid valve suction to lift diaphragm, or insufficient lifting height, pipeline cannot be opened, affect the reverse operation of large flow medium.

[0003] The utility model provides a kind of low-temperature reverse operation's step-by-step direct acting solenoid valve, can normally reverse operation under low-temperature environment, solve this problem, specific extensive use value. UTILITY MODEL CONTENT

[0004] The utility model is mainly to provide a kind of low-temperature reverse operation's step-by-step direct acting solenoid valve, to effectively solve the problem raised in background art.

[0005] To achieve the above object, the utility model takes the following technical scheme: a kind of low-temperature reverse operation's step-by-step direct acting solenoid valve, including valve body, valve cover, valve core, electromagnetic coil;The diaphragm is covered on the upper surface of the valve body hole, the lower side center of diaphragm is equipped with circular clamping pad, the upper side center is equipped with sealing pad, and the center is provided with columnar pilot nozzle, which penetrates sealing pad, diaphragm, circular clamping pad and clamps and fixes the three;

[0006] Tapered valve cover is provided on the upper surface of diaphragm, and the valve body hole is located in the valve cover, and the valve body, diaphragm and valve cover are tightly fixed by bolt;The center of the top end of valve cover is blind pipe, and the electromagnetic coil is fixedly sleeved on the outer side of blind pipe, the valve core of solenoid valve is cylindrical, and is movably sleeved in the center of the top end of valve cover blind pipe, the center of the upper end of valve core is provided with blind hole, and small spring is arranged in blind hole, and the upper end of small spring is located on the top of the top end blind pipe of valve cover;One sealing pad is fixed to the lower end of valve core, a tension spring is fixed to the outer side of valve core, and the other end of tension spring is fixed to the side of pilot nozzle by pin.

[0007] Preferably, the center of the pilot nozzle is provided with a circular inner hole, and the upper end is tapered, and the tapered top end is provided with a pilot small hole.

[0008] Preferably, the circular inner hole of the pilot nozzle is provided with a steel ball, and a semicircular groove is formed in the lower end of the pilot nozzle, a steel wire is arranged in the semicircular groove, the steel wire is welded and fixed with the pilot nozzle, and the steel ball and the pilot small hole form a one-way valve, and the steel wire prevents the steel ball from falling.

[0009] Preferably, the diaphragm is provided with a balance hole outside the sealing pad.

[0010] Preferably, the diameter of the balance hole is smaller than that of the pilot small hole.

[0011] When the medium runs from right to left in low temperature environment, the medium enters the lower cavity of the valve body from the right side of the valve body, lifts the diaphragm, and then the medium flows out from the left side of the middle hole of the valve body, so that the valve can normally run;

[0012] When the medium runs reversely from the left side to the right side, the electromagnetic coil is started, the valve core moves upward, the pull spring pulls the pilot nozzle and the diaphragm upward, and before the improvement, due to the smaller elasticity of the diaphragm in the low temperature environment, the pull spring can only pull the diaphragm for a short distance or cannot pull the diaphragm, the medium cannot normally enter the right side channel from the middle hole of the valve body, but can only enter the upper side of the diaphragm from the pilot small hole and then enter the right side channel of the valve body from the balance hole, or a small amount of medium enters the right side channel of the valve body from the middle hole, so that the valve cannot normally run.

[0013] After the improvement, when the medium runs reversely, the medium lifts the steel ball to seal the pilot small hole, the pressure of the medium applied in the middle hole of the valve body is all applied to the diaphragm, the diaphragm can be lifted, and the medium can normally enter the right side channel of the valve body from the middle hole of the valve body.

[0014] Before the improvement, due to the pressure relief effect of the pilot small hole, the pressure of the medium cannot be completely applied to the diaphragm in the middle hole of the valve body, so the diaphragm cannot be lifted, and after the improvement, the pilot small hole is sealed, so no matter whether the high or low temperature environment is under the on or off state, when the medium runs reversely, the medium can normally flow.

[0015] In addition, when the medium runs forward in the low temperature environment or the pressure difference is large, if the pull spring at the lower end of the electromagnetic valve core does not directly pull to open the diaphragm, the medium enters the upper side of the diaphragm from the right side channel through the balance hole, and then enters the left side channel of the valve body from the pilot small hole, since the diameter of the pilot small hole is larger than that of the balance hole, the amount of outflowing medium is larger than that of inflowing medium, so that the pressure on the upper side of the diaphragm will not be too large, and the electromagnetic coil will not always fail to open the diaphragm.

[0016] The utility model discloses the beneficial effects that: ensure that in high and low temperature environment, step by step direct -acting electromagnetic valve positive, reverse can normally run. DRAWINGS

[0017] ATTACHED Figure 1 It is the structure schematic drawing of the utility model static state.

[0018] ATTACHED Figure 1 In the figure, valve body 1, lower cavity of valve body 2, diaphragm 3, balance hole 4, sealing pressure piece 5, pin 6, pilot nozzle 7, electromagnetic coil 8, small spring 9, valve core 10, pilot small hole 11, sealing gasket 12, valve cover 13, bolt 14, pull spring 15, round clamping pad 16, steel wire 17, steel ball 18. CONCRETE IMPLEMENTATION

[0019] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0020] Attached Figure 1 As shown in the figure, a low-temperature reverse operation step direct acting electromagnetic valve, including valve body 1, valve cover 13, valve core 10, electromagnetic coil 8, the valve body 1 hole upper cover has diaphragm piece 3, the lower side center of diaphragm piece 3 is equipped with circular clamping pad 16, the upper center is equipped with sealing pad 5, the center is provided with cylindrical pilot nozzle 7 and is penetrated through sealing pad 5, diaphragm piece 3, circular clamping pad 16, and the three are clamped and fixed;

[0021] Diaphragm piece 3 upper surface is provided with conical valve cover 13, and the hole in valve body 1 is located in valve cover 13, and valve body 1, diaphragm piece 3 and valve cover 13 are tightly fixed by bolt 14; the center of the top end of valve cover 13 is a blind pipe, and the electromagnetic coil 8 is fixedly sleeved on the outer side of the blind pipe; the valve core 10 of the electromagnetic coil 8 is cylindrical, and is movably sleeved in the blind pipe at the top center of the valve cover 13; the upper end center of the valve core 10 is provided with a blind hole, and a small spring 9 is arranged in the blind hole, and the upper end of the small spring 9 is located on the top of the blind pipe at the top end of the valve cover; a sealing pad 12 is fixed to the lower end of the valve core 10, and a tension spring 15 is fixed to the outer side of the valve core 10, and the other end of the tension spring 15 is fixed to the side of the pilot nozzle 7 by a pin 6.

[0022] The center of the pilot nozzle 7 is provided with a circular inner hole, and the upper end is conical, and the conical top end is provided with a pilot small hole 11.

[0023] The circular inner hole of the pilot nozzle 7 is provided with a steel ball 18, and a semicircular groove is formed in the lower end of the pilot nozzle 7, and a steel wire 17 is arranged in the semicircular groove, and the steel wire 17 is welded and fixed with the pilot nozzle 7, and the steel ball 18 and the pilot small hole 11 form a one-way valve, and the steel wire 17 prevents the steel ball 18 from falling.

[0024] The diaphragm piece 3 is provided with a balance hole 4 outside the sealing pad 5.

[0025] The diameter of the balance hole 4 is smaller than that of the pilot small hole 11.

[0026] When the medium runs from right to left in a low-temperature environment, the medium enters the lower cavity 2 of the valve body 1 from the right side of the valve body, lifts the diaphragm piece 3, and then the medium enters the medium hole of the valve body and flows out from the left side, so that the valve can normally operate.

[0027] When the medium runs reversely, from the left side to the right side, the electromagnetic coil 8 is started, the valve core 10 is moved up, the pull spring 15 pulls the pilot nozzle 7 and the diaphragm 3 up, before the improvement, because the elasticity of the diaphragm 3 is small in the low-temperature environment, the pull spring 15 can only pull the diaphragm 3 up for a short distance or cannot pull the diaphragm 3 up, the medium cannot normally enter the right side channel from the hole in the valve body 1, but can only enter the upper side of the diaphragm 3 from the pilot small hole 11 and then enter the right side channel of the valve body from the balance hole 4, or a small amount of medium enters the right side channel of the valve body from the middle hole.

[0028] After the improvement, when the medium runs reversely, the medium lifts the steel ball 18 to seal the pilot small hole 11, the pressure of the medium applied in the hole in the valve body 1 is all applied to the diaphragm 3, the diaphragm 3 can be lifted up, and the medium normally enters the right side channel of the valve body from the hole in the valve body.

[0029] Before the improvement, because the pilot small hole 11 produces pressure relief, the pressure of the medium cannot be completely applied to the diaphragm 3 in the hole in the valve body 1, so the diaphragm 3 cannot be lifted up, after the improvement, the pilot small hole 11 is sealed, so no matter the high-temperature or low-temperature environment, the medium can normally flow.

[0030] In addition, when the medium runs forward in the low-temperature environment or the pressure difference is too large, if the pull spring at the lower end of the electromagnetic valve core does not directly pull to open the diaphragm 3, the medium enters the upper side of the diaphragm 3 from the right side channel through the balance hole 4, and then enters the left side channel of the valve body from the pilot small hole 11, because the diameter of the pilot small hole 11 is larger than that of the balance hole 4, the outflow amount of the medium is larger than the inflow amount of the medium, and the upper side of the diaphragm 3 will not be too large, so that the electromagnetic coil 8 cannot be opened.

[0031] Beneficial effects: ensure that the forward and reverse directions of the step-by-step direct-acting electromagnetic valve can normally run under the conditions of on-off electricity in high-temperature and low-temperature environments.

[0032] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A low temperature reverse operable step direct acting solenoid valve characterized by: It includes valve body, valve cover, valve core, electromagnetic coil; The upper surface of the hole in the valve body is covered with a diaphragm, the lower side of the diaphragm is provided with a circular clamping pad in the center, the upper side is provided with a sealing pad in the center, and a cylindrical pilot nozzle is provided in the center and penetrates the sealing pad, the diaphragm and the circular clamping pad and clamps and fixes the three; The upper surface of the diaphragm is provided with a conical valve cover, the hole in the valve body is located in the valve cover, and the valve body, the diaphragm and the valve cover are tightly fixed by bolts; The center of the top end of the valve cover is a blind pipe, the electromagnetic coil is fixed outside the blind pipe, the electromagnetic valve core is cylindrical, moves and is sleeved in the blind pipe at the center of the top end of the valve cover, a blind hole is arranged in the center of the upper end of the valve core, a small spring is arranged in the blind hole, and the upper end of the small spring is in abutment with the top of the blind pipe at the top end of the valve cover; A sealing pad is fixed to the lower end of the valve core, a tension spring is fixed to the outer side of the valve core, and the other end of the tension spring is fixed to the side of the pilot nozzle by a pin; The center of the pilot nozzle is provided with a circular inner hole, the upper end is conical, and a pilot small hole is arranged at the conical top end; The circular inner hole of the pilot nozzle is provided with a steel ball, a semicircular groove is formed in the lower end of the pilot nozzle, a steel wire is arranged in the semicircular groove, the steel wire is welded and fixed to the lower end of the pilot nozzle, and the steel ball and the pilot small hole form a one-way valve, and the steel wire prevents the steel ball from falling.

2. A low temperature reverseable step direct acting solenoid valve according to claim 1, characterized in that: The diaphragm is provided with a balance hole outside the sealing pad.

3. A low temperature reverseable step direct acting solenoid valve according to claim 2, characterized in that: The diameter of the balance hole is smaller than that of the pilot small hole.

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