TWM584385U - Solenoid valve - Google Patents

Abstract

A solenoid valve includes: a valve body, an accommodation space is provided on a coil side; a valve rod includes a rod body, a return-side valve plug portion provided at one end of the rod body, and an insertion portion at the other end of the rod body; A cover, a front cover, a piston, including a collar portion that is sleeved to the insertion portion of the valve stem, and a piston portion that extends forward from the collar portion and is accommodated in an accommodation space of the valve body; and an electromagnetic unit. When the electromagnetic unit is de-energized, the piston is pressed against the front cover. When the electromagnetic unit is energized, the movable iron core group of the electromagnetic unit moves forward, so that the gas volume of the mounting groove of the front cover becomes larger, and because the mounting groove of the front cover and the accommodation space of the valve body are communicated through the through hole, the piston And the valve stem can be moved backward together due to the effect of air pressure until the valve plug on the return side of the valve stem presses against the rear cover.

Description

The electromagnetic valve

The present invention relates to a valve, and particularly to a solenoid valve.

Referring to FIG. 1, a conventional solenoid valve 1 includes a valve body 11 having a plurality of valve ports 111, a valve rod 12 passing through the valve body 11 and capable of moving between the valve body 11 between two positions, and a valve body 11. A magnetic induction module 13 on one side of the valve body 11 and abutting one end of the valve stem 12, a front seat 15, a piston 16, and a cover disposed between the valve body 11 and the magnetic induction module 13. A cover plate 14 disposed on the other side of the valve body 11 and connected to the valve stem 12.

The valve rod 12 includes a rod body 120, a coil-side valve plug 121 provided at one end of the rod body 120, a return-side valve plug 122 provided at the other end of the rod body 120, and several sleeves disposed on the rod. A leakage preventing member 123 (such as an O-ring or the like) on the body 120.

The magnetic induction module 13 has a movable iron core 131 that pushes against the piston 16 and a coil 132 that is electrically connected to an external power source and surrounds the movable iron core 131.

The front seat 15 is used for receiving the piston 16.

When the above-mentioned conventional solenoid valve 1 is used, air pressure is applied to both ends of the valve rod 12 and the movable iron core 131 is controlled with electric current, so that the valve rod 12 and the piston 16 can work together due to electromagnetic induction and air pressure By moving between the two positions, the direction in which the gas flows in the valve body 11 can be switched.

However, since the piston 16 is in the shape of a sheet, and the piston 16 is always accommodated in the accommodation space of the front seat 15 when it moves between the two positions, the depth of the accommodation space (approximately equal to the The travel stroke of the piston 16) is much larger than the thickness d of the piston 16, that is, the thickness D of the front seat 15 is large. Therefore, when the piston 16 moves in the accommodation space of the front seat 15, it may tilt over and cause air leakage. , That is, the reliability of the product is low. In addition, since the front seat 15 is usually made of plastic, it is disadvantageous that it is not easy to manufacture and the product yield is low if the accommodation space (ie, the cylinder space) is to be formed in the front seat 15 made of plastic. Therefore, it is necessary to find a solution.

Therefore, the object of the present invention is to provide a solenoid valve.

Therefore, the new type solenoid valve includes a valve body defining a channel penetrating from its return side to the coil side, a plurality of valve ports communicating with the channel, and a valve opening opened on the coil side and communicating with the channel. Accommodating space; a valve stem is accommodated in the passage of the valve body, and can slide relative to the valve body, and includes a rod body, and a position on the return side of the rod body adjacent to the valve body One end of the return side valve plug portion, and an insertion portion at the other end of the rod body; a back cover, air-tightly disposed on the return side of the valve body, including a central portion, and a ring device An annular portion of an accommodating groove communicating with the channel of the valve body is defined at the periphery of the central portion and with the central portion, wherein the accommodating groove is used for accommodating the return-side valve plug portion of the valve stem. A front cover, which is arranged on the coil side of the valve body and is close to the accommodation space of the valve body, and a mounting slot is opened forward, and a through hole penetrating from the installation slot to the accommodation space is provided; A piston, including a sleeve portion connected to the insertion portion of the valve stem, and a forward extension and accommodation from the sleeve portion A piston portion in the accommodating space of the valve body, wherein a thickness of the piston portion in a front-rear direction is smaller than a length of the accommodating space in the front-rear direction; and an electromagnetic unit including a portion disposed in the The pilot tube in the mounting slot of the front cover, a coil surrounding the pilot tube, and a movable iron core set in the pilot tube and in the mounting slot of the front cover. When the coil is not energized, the piston Pressing against the front cover, when the coil is energized, the movable core group moves forward, so that the gas volume of the mounting slot of the front cover becomes larger, and because of the mounting slot of the front cover and the capacity of the valve body, The installation space is communicated through the through hole, so the piston and the valve stem can move backward together due to the action of air pressure until the return-side valve plug portion of the valve stem presses against the central portion of the rear cover.

The effect of the novel model is that, because the piston is accommodated in the accommodating space of the valve body and is sleeved with the valve stem, when the piston slides back and forth in the accommodating space, it will not tilt and flip. Therefore, there will be no air leakage problem; furthermore, since the space for accommodating the piston in the front cover is omitted, the overall volume of the new type solenoid valve is greatly reduced, and it is easier to manufacture, especially When the material of the front cover is plastic, it can highlight the advantages of higher product reliability and higher yield.

Referring to FIGS. 2, 3, 4, 5, and 9, an embodiment of the novel solenoid valve includes a valve body 2, a valve stem 3, a rear cover 4, a front cover 5, a piston 6, and an electromagnetic unit 7. And several leak-proof parts (such as U-ring 81 ~ 86, O-ring 9 and so on).

The valve body 2 defines a channel 20 penetrating from the return side 21 to the coil side 22, a plurality of valve ports communicating with the channel 20, and an accommodating space 24 opened on the coil side 22 and communicating with the channel 20. , And an inner flow channel 25 (as shown in FIG. 9). In this embodiment, since the solenoid valve is an example of a five-port two-position valve, the valve ports include a pressure source valve port 230, two exhaust valve ports 231, 232, and two working pipeline valve ports 234. , 235, wherein the inner flow channel 25 is in communication with the channel 20 and the air pressure source valve port 230, the two exhaust valve ports 231, 232, and the two working pipeline valve ports 234, 235.

Referring to FIGS. 3, 4, 6, and 7, in this embodiment, the valve stem 3 is accommodated in the channel 20 of the valve body 2 and can slide relative to the valve body 2, and includes a rod body 30 A return-side valve plug portion 31 located at one end of the rod body 30 adjacent to one end of the return side 21 of the valve body 2 and an insertion portion 32 located at the other end of the rod body 30.

As shown in FIG. 3, the rear cover 4 is air-tightly disposed on the return side 21 of the valve body 2, and includes a central portion 41, and a ring disposed on the periphery of the central portion 41 and shared with the central portion 41. An annular portion 42 of an accommodating groove 40 communicating with the passage 20 of the valve body 2 is defined. The accommodating groove 40 is used for accommodating the return-side valve plug portion 31 of the valve stem 3. The rear outlet 251 of the inner flow channel 25 of the valve body 2 is communicated to the passage 20 of the valve body 2 through the central portion 41 of the rear cover 4.

3, 4, and 5, the front cover 5 is disposed on the coil side 22 of the valve body 2 and is adjacent to the accommodation space 24 of the valve body 2. A mounting groove 51 is opened forward, and The mounting groove 51 penetrates the through hole 52 of the accommodating space 24 and a blind air hole 53 spaced from the through hole 52 and communicating with the front outlet 252 of the inner flow channel 25.

Referring to FIGS. 3, 6 and 8, the piston 6 includes a sleeve portion 61 connected to the insertion portion 32 of the valve stem 3, and a sleeve portion 61 extending forward from the sleeve portion 61 and accommodated in the valve body 2. The piston portion 62 in the accommodating space 24, wherein the thickness T of the piston portion 62 in a forward-backward direction is smaller than the length L of the accommodating space 24 in the forward-backward direction. In this embodiment, the difference between the length L and the thickness T is the stroke that the piston 6 and the valve stem 3 move together.

As shown in FIG. 8, in this embodiment, the piston portion 62 of the piston 6 has a large diameter section 621 extending forward from the collar portion 61 and having an outer diameter greater than the outer diameter of the collar portion 61, and A small diameter section 622 extending forward from the large diameter section 621 and having an outer diameter smaller than the outer diameter of the large diameter section 621 and larger than the outer diameter of the collar portion 61. As shown in FIGS. 3 and 6, the U-ring 81 is provided on the shoulder portion 623 formed between the large-diameter section 621 and the small-diameter section 622, and the O-ring 9 is provided on the collar portion 61 and the insertion portion 32 of the valve stem 3.

In this embodiment, the electromagnetic unit 7 includes a pilot tube 71 partially disposed in the mounting groove 51 of the front cover 5, a coil 73 surrounding the pilot tube 71, and a coil 73 disposed in the pilot tube 71 and A movable core group 72 in the mounting slot 51 of the front cover 5. As shown in the first position of FIG. 3, when the coil 73 is not energized, the rear end of the movable core group 72 of the electromagnetic unit 7 hermetically closes the blind air hole 53, and the piston 6 is pressed against the front cover 5. .

Referring to FIGS. 9 and 10, on the contrary, when the coil 73 is energized, the movable core group 72 is attracted by the energized coil 73 and moves forward, so that the blind air hole 53 is not closed airtightly (so the front cover 5 should be The installation groove 51 can communicate with the inner flow channel 25 through the blind air hole 53), and the gas volume of the installation groove 51 of the front cover 5 becomes larger, and because the installation groove 51 and the valve body of the front cover 5 The accommodating space 24 of 2 is communicated through the through hole 52, so the piston 6 and the valve stem 3 can move backward together due to the effect of air pressure until the return-side valve plug portion 31 of the valve stem 3 is pressed against The central portion 41 of the rear cover 4 is the second position shown in FIG. 10. Then, when the coil 73 is not energized again, the movable core group 72 moves back due to the spring restoring force and returns to the position shown in FIG. 3 again, and the piston 6 and the valve stem 3 return to FIG. 3 again by the action of air pressure. The first position shown.

In summary, since the piston 6 of the new solenoid valve is accommodated in the accommodation space 24 of the valve body 2 and is sleeved with the valve stem 3, when the piston 6 is in the accommodation space 24 When it slides back and forth in the middle, it will not tilt and flip, and there will be no air leakage problem. Furthermore, because the space of the piston 6 in the front cover 5 is omitted, the whole of the new solenoid valve The volume is greatly reduced and it is easier to manufacture. Especially when the material of the front cover 5 is plastic, it can highlight the advantages of higher reliability and higher yield of the product; so it can indeed achieve the purpose of new cost.

However, the above are only examples of the new model. When the scope of the new model cannot be limited by this, any simple equivalent changes and modifications made in accordance with the scope of the patent application for the new model and the contents of the patent specification are still Within the scope of this new patent.

2‧‧‧Valve body
20‧‧‧channel
21‧‧‧ return side
22‧‧‧ coil side
230‧‧‧Pneumatic source valve port
231‧‧‧Exhaust valve port
232‧‧‧Exhaust valve port
234‧‧‧Working line valve port
235‧‧‧Working line valve port
24‧‧‧ accommodation space
25‧‧‧Inner channel
251‧‧‧ rear exit
252‧‧‧Exit ahead
3‧‧‧ Stem
30‧‧‧ Rod
31‧‧‧Return side valve plug
32‧‧‧ Insertion section
4‧‧‧ back cover
40‧‧‧ Receiving slot
41‧‧‧ Central
42‧‧‧Ring
5‧‧‧ front cover
51‧‧‧Mounting slot
52‧‧‧through hole
53‧‧‧ Blind Stomata
6‧‧‧Piston
61‧‧‧Ring section
62‧‧‧Piston
621‧‧‧large diameter section
622‧‧‧footpath
623‧‧‧Shoulder
7‧‧‧ electromagnetic unit
71‧‧‧ first catheter
72‧‧‧ Movable iron core group
73‧‧‧coil
81 ~ 86‧‧‧U ring
9‧‧‧O-ring
L‧‧‧ length
T‧‧‧thickness

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, among which:
Figure 1 is a perspective view illustrating a conventional solenoid valve;
FIG. 2 is a perspective view illustrating components such as a valve body, a front cover, a rear cover, and a lead pipe in the embodiment of the novel solenoid valve; FIG.
3 is a cross-sectional view illustrating components such as a valve body, a valve stem, a piston, a front cover, a rear cover, and an electromagnetic unit in the embodiment, wherein the valve stem and the piston are located in a first position;
Figure 4 is a sectional view illustrating the valve body;
5 is another cross-sectional view illustrating the valve body;
Figure 6 is a sectional view illustrating the valve stem and the piston;
Figure 7 is a sectional view illustrating the valve stem;
Figure 8 is a sectional view illustrating the piston;
9 is a cross-sectional view illustrating the IX-IX cross-section in FIG. 4; and FIG. 10 is a cross-sectional view illustrating the valve rod and the piston moving to a second position together.

Claims (8)

A solenoid valve comprising:
A valve body defining a channel penetrating from the return side to the coil side, a plurality of valve ports communicating with the channel, and an accommodating space opened on the coil side and communicating with the channel;
A valve stem is accommodated in the passage of the valve body and can slide relative to the valve body, and includes a stem body, a return position located at one end of the stem body adjacent to the return side of the valve body. A side valve plug portion, and an insertion portion at the other end of the rod body;
A back cover is air-tightly disposed on the return side of the valve body, and includes a central portion, and a ring disposed on the periphery of the central portion and jointly defining a communication with the passage of the valve body with the central portion. An annular portion of the receiving groove, wherein the receiving groove is used for receiving the return-side valve plug portion of the valve stem;
A front cover is disposed on the coil side of the valve body and is adjacent to the accommodation space of the valve body, and a mounting slot is opened forward, and a through hole penetrating from the installation slot to the accommodation space is provided;
A piston includes a sleeve portion connected to the insertion portion of the valve stem, and a piston portion extending forward from the sleeve portion and received in the accommodation space of the valve body. The thickness of the piston portion in a front-rear direction is smaller than the length of the accommodating space in the front-rear direction; and an electromagnetic unit including a leading pipe partially disposed in the mounting groove of the front cover, and a surrounding pipe A coil, and a movable iron core set in the leading duct and in the mounting slot of the front cover. When the coil is not energized, the piston is pressed against the front cover. Moving forward makes the gas volume of the mounting groove of the front cover larger, and since the mounting groove of the front cover and the accommodation space of the valve body are communicated through the through hole, the piston and the valve The stem can be moved backward together due to the effect of the air pressure until the return-side valve plug portion of the valve stem presses against the central portion of the rear cover. The solenoid valve according to claim 1, wherein the valve ports include a pressure source valve port, two exhaust valve ports, and two working line valve ports. The solenoid valve according to claim 2, wherein the valve body further defines a receiving groove with the channel and the pressure source valve port, the two exhaust valve ports, the two working pipeline valve ports, and the rear cover. An inner flow channel communicating with the through hole of the front cover, the rear outlet of the inner flow channel is communicated to the passage of the valve body through the central portion of the back cover. The solenoid valve according to claim 3, wherein the front cover is further provided with a blind air hole spaced from the through hole and communicating with the front outlet of the inner flow channel. When the coil is not energized, The rear end of the movable iron core group air-tightly closes the blind air hole. When the coil is energized, the movable iron core group moves forward so that the blind air hole is not air-tightly closed, so the mounting groove of the front cover can pass through. The blind air hole is in communication with the inner flow channel. The solenoid valve according to claim 1, wherein a difference between the length of the accommodating space of the valve body and the thickness of the piston portion is equal to the stroke of the piston and the valve stem. The solenoid valve according to claim 1, wherein the piston portion of the piston has a large diameter section extending forward from the collar portion and having an outer diameter larger than the outer diameter of the collar portion, and a large diameter portion from the large diameter The small-diameter section extending forward and having an outer diameter smaller than the outer diameter of the large-diameter section and larger than the outer diameter of the collar portion. The solenoid valve according to claim 6, further comprising a U-shaped ring provided on a shoulder formed between the large diameter section and the small diameter section. The solenoid valve according to claim 6, further comprising an O-ring disposed between the collar portion of the piston and the insertion portion of the valve stem.