CN217381855U

CN217381855U - Two-position three-way electromagnetic valve

Info

Publication number: CN217381855U
Application number: CN202220408726.9U
Authority: CN
Inventors: 徐�明
Original assignee: Ningbo Yongcheng Pneumatic Complete Set Co ltd
Current assignee: Ningbo Yongcheng Pneumatic Complete Set Co ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-09-06
Anticipated expiration: 2032-02-28

Abstract

The utility model discloses a two-position three-way electromagnetic valve, which comprises a valve body and a pilot valve component, wherein a valve cavity, an air inlet P, an air outlet A, an air outlet R and a pilot channel are arranged in the valve body, a valve rod is arranged in the valve cavity, the valve rod is provided with a first piston and a second piston which are in sliding fit with the valve cavity, a first cavity is formed between the first piston and the valve body, a second cavity is formed between the second piston and the valve body, the first piston is provided with an air guide channel which is communicated with the first cavity and the air inlet P, a first spring which drives the valve rod to move towards one side of the second piston is arranged in the first cavity, the valve body is provided with a first valve port which is communicated with the pilot channel and the second cavity, the pilot valve component is used for conducting or cutting off the first valve port, the air guide channel is arranged on the first piston to communicate the air inlet P with the first cavity, when the valve rod moves downwards, the gas in the first cavity can be discharged to the air outlet P, compared with the prior art, the structure can prevent impurities such as dust from entering the valve body to influence the normal operation of the valve body.

Description

Two-position three-way electromagnetic valve

Technical Field

The utility model relates to a technical field of solenoid valve, in particular to two-position three way solenoid valve.

Background

For the production of plastic bottles, in particular PP and PET bottles, the parison or pre-processed material is usually inflated in two steps to its final shape in the blowing cylinder of a hollow body blower. For this purpose, the preform has essentially a finished bottle head which is held in the tuyere of the hollow body blower and is connected to a compressed air system. By blowing compressed air through the bottle head, the blank is inflated and finally takes its final shape.

The above-described filling process is usually carried out in a two-position three-way solenoid valve divided into two phases, in which pre-blowing is carried out as a first phase through a pre-blowing valve at a pressure of between 2 and 20bar, and then in a second phase, final blowing, that is to say shaping of the plastic bottle into its final shape, is carried out through a main blowing valve at a pressure of between 15 and 40 bar. Further, the plastic bottle opening can be molded and formed by the two stages of different pressures, and the structural characteristics of the plastic bottle opening can be enhanced.

In the conventional two-stage inflation step, the two pressure sources are usually used to respectively input two air pressure input ports, so as to sequentially introduce air pressures with different intensities into a molding cavity to form an opening of the plastic bottle; it should be noted that the two air pressure input ports are controlled by the electric control unit, and when the air pressure is supplied in the first stage, the air pressure input port corresponding to the air pressure in the second stage is closed, whereas when the air pressure is supplied in the second stage, the air pressure input port corresponding to the air pressure in the first stage is closed, so as to prevent the two different air pressures from affecting each other.

The control pipeline of the existing high-pressure bottle blowing machine generally adopts two-position three-way electromagnetic valves to control the air path so as to realize the purpose of high-pressure blow molding, namely a low-pressure control pipeline matched with the electromagnetic valve needs to be arranged, the pipeline is overstaffed due to the structure, the whole volume is larger, the connection and assembly of the electromagnetic valve are more complicated, the existing electromagnetic valve applied to the high-pressure bottle blowing machine is shown in the figure I, an air exhaust passage is arranged on the bottom (valve cover) of a valve body, when a valve rod moves downwards, air in a lower end cavity can be smoothly exhausted, but the arrangement easily causes impurities such as dust and the like to enter the interior of the valve body through the air exhaust passage to influence the normal operation of the valve body, and even causes the service life of the electromagnetic valve to be reduced.

Disclosure of Invention

The utility model aims at providing a two-position three way solenoid valve, the pilot valve subassembly can reach 4 MPa's pressure, this solenoid valve adopts double-piston balanced type structure simultaneously, make this structure compacter, the commonality is stronger, lead the air flue so that air inlet P and first cavity intercommunication through setting up on first piston, can be with the gas outgoing to gas vent P in the first cavity when the valve rod moves down, this interior formula structure of arranging is compared in prior art, this structure can prevent that impurities such as dust from influencing its normal operating in the valve body.

The above technical purpose of the present invention can be achieved by the following technical solutions: a two-position three-way electromagnetic valve comprises a valve body and a pilot valve assembly, wherein a valve cavity, an air inlet P, an air outlet A, an air outlet R and a pilot channel are arranged in the valve body, a valve rod is arranged in the valve cavity, the valve rod is provided with a first piston and a second piston which are in sliding fit with the valve cavity, a first cavity is formed between the first piston and the valve body, a second cavity is formed between the second piston and the valve body, the first piston is provided with an air guide channel communicated with the first cavity and the air inlet P, a first spring driving the valve rod to move towards one side of the second piston is arranged in the first cavity, the valve body is provided with a first valve port communicated with the pilot channel and the second cavity, the pilot valve assembly is used for conducting or cutting off the first valve port, the pilot valve assembly comprises a magnetism isolating pipe, a static iron core, a movable iron core and a coil, the magnetism isolating pipe is connected to the position of the valve body corresponding to the first valve port through a magnetism isolating seat, and the coil is wound around the periphery of the magnetism isolating pipe, the static iron core is fixedly arranged in the magnetic isolation tube, the movable iron core is arranged in the magnetic isolation tube in a sliding mode, a second spring for driving the movable iron core to move towards the direction close to the first valve port is arranged in the magnetic isolation seat, and the movable iron core is provided with a first sealing plug for sealing the first valve port.

Furthermore, the magnetism isolating pipe and the static iron core are fixed into a whole through rolling.

Further, the magnetism isolating pipe and the magnetism isolating seat are integrally formed.

Furthermore, the valve body is provided with a second valve port for communicating the air inlet P with the air outlet A and a third valve port for communicating the air outlet A with the air outlet R, a second sealing plug for sealing the second valve port is arranged on one side of the valve rod close to the air inlet P, and a third sealing plug for sealing the third valve port is arranged on one side of the valve rod close to the air outlet R.

Further, the valve body comprises a valve body, and a first end cover and a second end cover which are fixedly connected to two sides of the valve body, the first chamber is formed by the first end cover, the valve body and the first piston in an encircling mode, and the second chamber is formed by the second end cover, the valve body and the second piston in an encircling mode.

Further, the first piston and the second piston are respectively fixed at the upper end and the lower end of the valve rod through nuts.

Furthermore, the first piston and the second piston respectively comprise a cylinder I and a cylinder II, the outer diameter of the cylinder II is larger than that of the cylinder I, the cylinder II is in sliding fit with the valve cavity, a sealing ring is arranged on the periphery of the cylinder II, the second valve port is matched with the cylinder I at the lower end to limit the upward moving stroke of the valve rod, and the third port is matched with the cylinder I at the upper end to limit the downward moving stroke of the valve rod.

Furthermore, the lower end of the movable iron core is in threaded connection with an installation block, the first sealing plug is fixedly installed on the lower portion of the movable iron core through the installation block, a flange is arranged on the lower portion of the installation block in a protruding mode, the upper end of the second spring acts on the magnetic isolation seat, and the lower end of the second spring acts on the flange.

Furthermore, an exhaust passage communicated with the second cavity is arranged in the middle of the static iron core, and a fourth sealing plug used for cutting off the exhaust passage is arranged at the upper end of the movable iron core.

To sum up, the utility model discloses following beneficial effect has:

1. the magnetism isolating pipe and the magnetism isolating seat are integrally formed, so that the connecting strength of the magnetism isolating pipe and the magnetism isolating seat can be increased, the magnetism isolating pipe and the static iron core are fixed into a whole through rolling, compared with the traditional welding mode, the fixing mode is more convenient to operate, the separation of the magnetism isolating pipe and the static iron core caused by the impact of the movable iron core can be effectively prevented, and meanwhile, the pressure of the pilot valve assembly can reach 4MPa to meet the working requirement of a high-pressure bottle blowing machine;

2. the electromagnetic valve adopts a double-piston balanced structure, so that the structure is more compact and the universality is stronger;

3. through set up the air guide way on first piston so that air inlet P and first cavity intercommunication, can discharge the gas in the first cavity to gas vent P when the valve rod moves down, this interior formula structure of arranging compares in prior art, and this structure can prevent that impurity such as dust from influencing its normal operating in getting into the valve body.

Drawings

Fig. 1 is a schematic structural diagram of the prior art of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is an enlarged view of the point a of the present invention.

In the figure: 1. a valve body; 11. a valve cavity; 12. a pilot channel; 13. a first valve port; 14. a second valve port; 15. a third valve port; 2. a pilot valve assembly; 21. a magnetism isolating pipe; 22. a stationary iron core; 221. an exhaust passage; 23. a movable iron core; 231. A fourth sealing plug; 24. a coil; 25. a magnetism isolating seat; 26. a second spring; 27. a first sealing plug; 28. mounting a block; 281. a flange; 3. a valve stem; 31. a first piston; 311. a first chamber; 312. an air guide passage; 32. a second piston; 321. a second chamber; 33. a second sealing plug; 34. a third sealing plug; 35. a nut; 4. a first spring.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 2-3, a two-position three-way electromagnetic valve includes a valve body 1 and a pilot valve assembly 2, a valve cavity 11, an air inlet P, an air outlet a, an air outlet R and a pilot passage 12 are disposed in the valve body 1, a valve rod 3 is disposed in the valve cavity 11, the valve rod 3 is provided with a first piston 31 and a second piston 32 which are slidably fitted with the valve cavity 11, a first chamber 311 is formed between the first piston 31 and the valve body 1, a second chamber 321 is formed between the second piston 32 and the valve body 1, the first piston 31 is provided with an air guide passage 312 which communicates the first chamber 311 with the air inlet P, a first spring 4 which drives the valve rod 3 to move toward one side of the second piston 32 is disposed in the first chamber 311, the valve body 1 is provided with a first valve port 13 which communicates the pilot passage 12 with the second chamber 321, the pilot valve assembly 2 is used for connecting or disconnecting the first valve port 13, and the electromagnetic valve adopts a double-piston balanced structure, the structure is more compact, and the universality is stronger.

Through set up air guide way 312 on first piston 31 so that air inlet P and first cavity 311 communicate, can discharge the gas in the first cavity 311 to gas vent P when valve rod 3 moves down, this interior formula structure compares in prior art, and this structure can prevent that impurity such as dust from getting into in the valve body 1 and influencing its normal operating.

The valve body 1 comprises a valve body, and a first end cover and a second end cover which are fixedly connected to two sides of the valve body, the first chamber 311 is formed by surrounding the first end cover, the valve body and the first piston 31, and the second chamber 321 is formed by surrounding the second end cover, the valve body and the second piston 32.

Valve body 1 is equipped with the second valve port 14 of intercommunication air inlet P and gas outlet A and the third valve port 15 of intercommunication gas outlet A and gas vent R, valve rod 3 is close to air inlet P one side and is equipped with the second sealing plug 33 that is used for sealed second valve port 14, and valve rod 3 is close to gas vent R one side and is equipped with the third sealing plug 34 that is used for sealed third valve port 15, the utility model discloses in, second sealing plug 33 sets up the up end at first piston 31, third sealing plug 34 sets up the lower terminal surface at second piston 33.

The first piston 31 and the second piston 32 are respectively fixed at the upper end and the lower end of the valve rod 3 through nuts 35, the first piston 31 and the second piston 32 respectively comprise a cylinder I and a cylinder II, the outer diameter of the cylinder II is larger than that of the cylinder I, the cylinder II is in sliding fit with the valve cavity 11, a sealing ring is arranged on the periphery of the cylinder II, the second valve port 14 is matched with the cylinder I at the lower end to limit the upward moving stroke of the valve rod 3, and the third port is matched with the cylinder I at the upper end to limit the downward moving stroke of the valve rod 3.

The pilot valve assembly 2 comprises a magnetism isolating pipe 21, a static iron core 22, a movable iron core 23 and a coil 24, the magnetism isolating pipe 21 is connected to the position of the valve body 1 corresponding to the first valve port 13 through a magnetism isolating seat 25, the coil 24 is wound on the periphery of the magnetism isolating pipe 21, the static iron core 22 is fixedly arranged in the magnetism isolating pipe 21, the movable iron core 23 is slidably arranged in the magnetism isolating pipe 21, a second spring 26 for driving the movable iron core 23 to move towards the direction close to the first valve port 13 is arranged in the magnetism isolating seat 25, the movable iron core 23 is provided with a first sealing plug 27 for sealing the first valve port 13, in the utility model, the magnetism isolating pipe 21 and the static iron core 22 are fixed into a whole through rolling, the magnetism isolating pipe 21 and the magnetism isolating seat 25 are integrally formed, the connection strength of the magnetism isolating pipe 21 and the magnetism isolating seat 25 can be increased, the magnetism isolating pipe 21 and the static iron core 22 are fixed into a whole through rolling, compared with the traditional welding mode, the fixing mode is more convenient to operate and can effectively prevent the separation of the magnetism isolating pipe 21 and the static iron core 22 caused by the impact of the movable iron core 23, and meanwhile, the pressure of the pilot valve assembly 2 can reach 4MPa to meet the working requirements of a high-pressure bottle blowing machine.

The lower end of the movable iron core 23 is in threaded connection with an installation block 28, the first sealing plug 27 is fixedly installed on the lower portion of the movable iron core 23 through the installation block 28, a flange 281 is convexly arranged on the lower portion of the installation block 28, the upper end of the second spring 26 acts on the magnetism isolating seat 25, the lower end of the second spring 26 acts on the flange 281, and the installation block 28 is arranged, so that the first sealing plug 27 is more convenient to install and has stronger stability.

The middle part of the static iron core 22 is provided with an exhaust passage 221 communicated with the second chamber 321, the upper end of the movable iron core 23 is provided with a fourth sealing plug 231 for blocking the exhaust passage 221, when the coil 24 is powered off, the movable iron core 23 moves downwards under the action of the second spring 26 to enable the first sealing plug 27 to seal the first valve port 13, the pilot passage 12 is blocked from the second chamber 321, the valve rod 3 moves upwards under the action of the first spring 4, and the gas in the second chamber 321 is exhausted through the exhaust passage 221.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. The utility model provides a two-position three way solenoid valve, includes valve body (1) and pilot valve subassembly (2), be equipped with valve pocket (11), air inlet P, gas outlet A, gas vent R and pilot channel (12) in valve body (1), valve rod (3) have been put in valve pocket (11), valve rod (3) are equipped with first piston (31) and second piston (32) with valve pocket (11) sliding fit, be formed with first cavity (311) between first piston (31) and valve body (1), be formed with second cavity (321) between second piston (32) and valve body (1), be equipped with in first cavity (311) and drive valve rod (3) first spring (4) towards second piston (32) one side motion, its characterized in that: the first piston (31) is provided with an air guide channel (312) communicated with the first cavity (311) and the air inlet P, the valve body (1) is provided with a first valve port (13) communicated with the pilot channel (12) and the second cavity (321), the pilot valve assembly (2) is used for conducting or separating the first valve port (13), the pilot valve assembly (2) comprises a magnetism isolating pipe (21), a static iron core (22), a movable iron core (23) and a coil (24), the magnetism isolating pipe (21) is connected to the position, corresponding to the first valve port (13), of the valve body (1) through a magnetism isolating seat (25), the coil (24) is wound on the periphery of the magnetism isolating pipe (21), the static iron core (22) is fixedly arranged in the magnetism isolating pipe (21), the movable iron core (23) is slidably arranged in the magnetism isolating pipe (21), a second spring (26) for driving the movable iron core (23) to move towards the direction close to the first valve port (13) is arranged in the magnetism isolating seat (25), the movable iron core (23) is provided with a first sealing plug (27) for sealing the first valve port (13).

2. The two-position, three-way solenoid valve of claim 1, wherein: the magnetism isolating pipe (21) and the static iron core (22) are fixed into a whole through rolling.

3. A two-position three-way solenoid valve according to claim 2, wherein: the magnetism isolating pipe (21) and the magnetism isolating seat (25) are integrally formed.

4. A two-position, three-way solenoid valve according to any one of claims 1 to 3, wherein: the valve body (1) is provided with a second valve port (14) for communicating the air inlet P with the air outlet A and a third valve port (15) for communicating the air outlet A with the air outlet R, a second sealing plug (33) for sealing the second valve port (14) is arranged on one side, close to the air inlet P, of the valve rod (3), and a third sealing plug (34) for sealing the third valve port (15) is arranged on one side, close to the air outlet R, of the valve rod (3).

5. The two-position, three-way solenoid valve of claim 4, wherein: the valve body (1) comprises a valve body, a first end cover and a second end cover, wherein the first end cover and the second end cover are fixedly connected to two sides of the valve body, a first cavity (311) is formed by surrounding the first end cover, the valve body and a first piston (31), and a second cavity (321) is formed by surrounding the second end cover, the valve body and a second piston (32).

6. A two-position, three-way solenoid valve according to claim 1, wherein: the first piston (31) and the second piston (32) are fixed to the upper end and the lower end of the valve rod (3) through nuts (35) respectively.

7. The two-position, three-way solenoid valve of claim 1, wherein: the first piston (31) and the second piston (32) respectively comprise a cylinder I and a cylinder II, the outer diameter of the cylinder II is larger than that of the cylinder I, the cylinder II is in sliding fit with the valve cavity (11), a sealing ring is arranged on the periphery of the cylinder II, the second valve port (14) is matched with the cylinder I at the lower end to limit the upward moving stroke of the valve rod (3), and the third port is matched with the cylinder I at the upper end to limit the downward moving stroke of the valve rod (3).

8. The two-position, three-way solenoid valve of claim 1, wherein: the lower end of the movable iron core (23) is in threaded connection with an installation block (28), a first sealing plug (27) is fixedly installed on the lower portion of the movable iron core (23) through the installation block (28), a flange (281) is convexly arranged on the lower portion of the installation block (28), the upper end of the second spring (26) acts on the magnetism isolating seat (25), and the lower end of the second spring (26) acts on the flange (281).

9. The two-position, three-way solenoid valve of claim 1, wherein: an exhaust passage (221) communicated with the second chamber (321) is formed in the middle of the static iron core (22), and a fourth sealing plug (231) used for isolating the exhaust passage (221) is arranged at the upper end of the movable iron core (23).