Pilot-operated type electromagnetic valve

Abstract

The pilot-operated type electromagnetic valve comprises a valve body, a valve cavity is formed in the valve body, a first air port, a second air port and a third air port which are communicated with the valve cavity are formed in the valve body, a pilot hole communicated with the third air port is formed in the valve body, and a valve element is arranged in the valve cavity in a sliding mode. The left side of the pilot hole communicates with a third air port and a valve cavity, the right side of the pilot hole communicates with the valve cavity in the right side of the valve element, the second air port is provided with a detachable plugging assembly, a sealing assembly is installed on the valve element, an electromagnetic driving assembly is arranged on the right side of the valve body, and a manual driving assembly is arranged on the valve body. The electromagnetic driving assembly and the manual driving assembly are matched, installation is convenient, the sealing performance is good, the valve element and the sealing assembly are convenient to maintain or replace, and cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic valves and relates to a pilot electromagnetic valve. Background Art

[0002] As a relatively mature technology, solenoid valves have been widely used. Solenoid valves are industrial equipment controlled by electromagnetics and used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. A two-position three-way solenoid valve is a relatively common solenoid valve, which mainly includes a valve body, a valve core and a pilot valve. The valve body is provided with three connection ports, and the valve core is provided with sealing members corresponding to the connection ports. A piston is integrally provided at the end of the valve core. The pilot valve controls the piston cavity where the piston is installed to allow air to enter or stop, so that the valve core moves and thus changes direction.

[0003] A Chinese utility model patent for a two-position three-way solenoid valve with application number 202220408726.9 includes a valve body and a pilot valve assembly, wherein a valve cavity, an air inlet P, an air outlet A, an exhaust port R and a pilot channel are arranged in the valve body, a valve stem is arranged in the valve cavity, the valve stem is provided with a first piston and a second piston which slide with the valve cavity, a first chamber is formed between the first piston and the valve body, a second chamber is formed between the second piston and the valve body, the first piston is provided with an air guide channel connecting the first chamber and the air inlet P, a first spring is provided in the first chamber to drive the valve stem to move toward one side of the second piston, and the valve body is provided with a first valve connecting the pilot channel and the second chamber The pilot valve assembly is used to open or close the first valve port. An air guide is provided on the first piston to connect the air inlet P with the first chamber. When the valve stem moves downward, the gas in the first chamber can be discharged to the exhaust port P. Compared with the prior art, this structure can prevent dust and other impurities from entering the valve body and affecting its normal operation. However, the valve core used in the existing solenoid valve requires high precision, otherwise the valve cavity cannot be accurately sealed, resulting in poor sealing. In addition, the valve core in the existing solenoid valve is inconvenient to install and disassemble. If there is a problem with the valve core, the solenoid valve needs to be directly replaced, which is costly. Therefore, it is necessary to design a pilot solenoid valve to solve the above problems. Utility Model Content

[0004] In view of the above problems and to overcome the defects of the prior art, the utility model proposes a pilot solenoid valve. The purpose of the utility model is to facilitate installation and good sealing, facilitate maintenance or replacement of the valve core and the sealing component, and save costs.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model includes a valve body, a valve cavity is opened in the valve body, a first air port, a second air port and a third air port connected to the valve cavity are opened on the valve body, a pilot hole connected to the third air port is opened in the valve body, a valve core is slidably arranged in the valve cavity, the left side of the pilot hole is connected to the third air port and the valve cavity, the right side of the pilot hole is connected to the valve cavity on the right side of the valve core, the second air port is provided with a detachable plugging assembly, a sealing assembly is installed on the valve core, an electromagnetic drive assembly is provided on the right side of the valve body, a manual drive assembly is provided on the valve body, and the electromagnetic drive assembly and the manual drive assembly cooperate with each other.

[0006] Preferably, the sealing assembly includes a connecting nut threadedly connected to the valve body, the connecting nut is arranged at the second air port, the inner ring of the connecting nut is inlaid with a hexagonal screw plug through a sealing gasket, an air inlet hole is opened in the middle position of the hexagonal screw plug, the air inlet hole is connected to the valve cavity through the second air port, and a first sealing ring is fixed on the connecting nut.

[0007] Preferably, a second sealing ring fixed to the valve body is provided in the valve cavity.

[0008] Preferably, the sealing assembly includes two first sealing rings sleeved on the valve core, a sealing member is arranged between the two first sealing rings, a connecting end ring is sleeved on the valve core, the connecting end ring is located on the left side of the first sealing ring, a part of the connecting end ring is located between the first sealing ring and the valve core, an adjusting gasket is arranged on the left side of the connecting end ring, and a locking nut threadedly connected to the valve core is arranged on the left side of the adjusting gasket.

[0009] Preferably, the electromagnetic drive assembly is fixed to a shell on the left side of the valve body, a sealing gasket is provided on the left side of the shell, a left nut threadedly connected to the shell is provided on the left side of the sealing gasket, a cavity is provided in the shell, a coil assembly is provided on the wall of the cavity, a sleeve is provided on the inner ring of the coil assembly, a static iron core is fixed in the sleeve, a moving iron core is slidably provided at the other end of the sleeve, the moving iron core blocks the sealing mouth through a spring, the sealing mouth is provided in the middle of the pilot hole, the moving iron core can block the pilot hole from connecting to the valve cavity on the right side of the valve core, and the spring is provided between the static iron core and the moving iron core.

[0010] Preferably, the manual drive assembly includes a positioning screw threadedly connected to the valve body, a knob is fixed on the positioning screw, a cam is fixed on the positioning screw, a switch sealing ring is sleeved on the outer side of the positioning screw, and the cam can cooperate with the moving iron core.

[0011] Preferably, a filter assembly fixed on the valve body is provided at the first air port, and a retaining ring is provided at the first air port.

[0012] Preferably, a tail sealing ring is provided on the right side of the valve core.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model forms a detachable structure through the cooperation of the valve body, the plugging component, the sealing component and the valve core, which is convenient for installing and disassembling the valve core, and replacing or repairing the valve core. At the same time, through the cooperation of the sealing component, the plugging component and the valve core, the solenoid valve can be suitable for valve cores of different precisions, and the precision requirement of the valve core is not high. It can be used in combination by adjusting the sealing component. At the same time, if there is a problem with the solenoid valve, it only needs to replace the sealing component, which saves cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view cross-sectional schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the front cross-sectional view of the structure of the utility model;

[0017] Figure 3 This is a front view of the manual drive assembly of the utility model.

[0018] Figure markings: 1-valve body, 2-valve cavity, 3-first air port, 4-second air port, 5-third air port, 6-pilot hole, 7-valve core, 8-connecting nut, 9-sealing gasket, 10-hexagonal screw plug, 11-air inlet, 12-first sealing ring, 13-second sealing ring, 14-first sealing ring, 15-seal, 16-connecting end ring, 17-adjusting gasket, 18-locking nut, 19-housing, 20-sealing gasket, 21-left nut, 22-cavity, 23-coil assembly, 24-sleeve, 25-static iron core, 26-moving iron core, 27-sealing nozzle, 28-spring, 29-positioning screw, 30-knob, 31-cam, 32-switch sealing ring, 33-filter assembly, 34-retaining ring, 35-tail sealing ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The following is combined with Figure 1-3 The specific implementation modes of the present utility model are further described in detail.

[0021] In this embodiment, by Figure 1-2 As shown, the utility model includes a valve body 1, a valve cavity 2 is provided in the valve body 1, a first air port 3, a second air port 4 and a third air port 5 connected to the valve cavity 2 are provided on the valve body 1, a pilot hole 6 connected to the third air port 5 is provided in the valve body 1, a valve core 7 is slidably arranged in the valve cavity 2, the left side of the pilot hole 6 is connected to the third air port 5 and the valve cavity 2, the right side of the pilot hole 6 is connected to the valve cavity 2 on the right side of the valve core 7, the second air port 4 is provided with a detachable plugging component, a sealing component is installed on the valve core 7, an electromagnetic drive component is provided on the right side of the valve body 1, a manual drive component is provided on the valve body 1, the electromagnetic drive component and the manual drive component cooperate, the shape of the valve core 7 is composed of a cross block and a tail block on the far right, the valve core 7 is pressed against the valve cavity 2 through the tail block, and the air on the right side of the valve core 7 cannot pass The valve core 7 is to the left side of the tail block of the valve core 7. When the product is powered off, the valve core 7 is located at the rightmost side of the valve cavity 2. At this time, the second air port 4 and the third air port 5 are connected, and ventilation can be carried out. When the solenoid valve is energized, the first air port 3 starts to take in air, and then the gas enters the valve cavity 2 on the right side of the valve core 7 through the pilot hole 6, pushing the valve core 7 to move to the left. The valve core 7 moves to the left and supports the sealing component through the sealing component. At this time, the second air port 4 is disconnected from the third air port 5, and the first air port 3 and the third air port 5 are connected for ventilation. The sealing component can be disassembled. After disassembling the sealing component, the valve core 7 and the sealing component can be taken out, which is convenient for replacement and reduces costs. At the same time, it is convenient to disassemble and install the solenoid valve. When the electromagnetic drive component is accidentally stuck, the solenoid valve core 7 can be controlled to open through the manual drive component. This can be used for auxiliary use to ensure the switching of the solenoid valve.

[0022] In this embodiment, by Figure 1-2 As shown, the plugging assembly includes a connecting nut 8 threadedly connected to the valve body 1, the connecting nut 8 is arranged at the second air port 4, the inner ring of the connecting nut 8 is inlaid with a hexagonal screw plug 10 through a plugging gasket 9, an air inlet hole 11 is opened in the middle position of the hexagonal screw plug 10, the air inlet hole 11 is connected to the valve cavity 2 through the second air port 4, a first sealing ring 12 is fixed on the connecting nut 8, the valve cavity 2 is located at the second air port 4 and is provided with a thread matching the connecting nut 8, so that the connecting nut 8 can be threadedly connected, which is convenient for disassembly and installation, and the gas enters from the air inlet and then enters the third air port 5 through the second air port 4. When the valve core 7 drives the sealing assembly to contact the first sealing ring 12, the second air port 4 is disconnected from the third air port 5, and a different sealing assembly is replaced and sleeved on the valve core 7 to cooperate with the first sealing ring 12 for plugging. In this way, the accuracy of the valve core 7 does not need to be so high, and it can be used according to the thickness of the adjusting sealing assembly, thereby reducing the production cost and not limiting the accuracy of the valve core 7.

[0023] In this embodiment, by Figure 1-2As shown, a second sealing ring 13 fixed on the valve body 1 is provided in the valve cavity 2. The second sealing ring 13 has the same shape as the first sealing ring 12 and is used to be arranged in the valve cavity 2 on the other side of the sealing assembly. When the sealing assembly and the valve core 7 cooperate with the first sealing assembly, the first air port 3 and the third air port 5 are disconnected.

[0024] In this embodiment, by Figure 1-2 As shown, the sealing assembly includes two first sealing rings 14 sleeved on the valve core 7, a sealing member 15 is arranged between the two first sealing rings 14, a connecting end ring 16 is sleeved on the valve core 7, the connecting end ring 16 is located on the left side of the first sealing ring 14, a part of the connecting end ring 16 is located between the first sealing ring 14 and the valve core 7, the connecting end ring 16 is pressed again by the first sealing ring 14, an adjusting gasket 17 is arranged on the left side of the connecting end ring 16, a locking nut 18 threadedly connected to the valve core 7 is arranged on the left side of the adjusting gasket 17, the middle side of the cross block of the valve core 7 is stepped, the first sealing ring 14 is used to support one side of the cross block of the valve core 7, and then the sealing member 15, the first sealing ring 14, the connecting end ring 16 and the adjusting gasket 17 are pressed by the cooperation of the locking nut 18, so as to improve the sealing performance, and the connection between the first gas port 3 and the third gas port 5 or the connection between the second gas port 4 and the third gas port 5 can be controlled by selecting connecting ends of different thicknesses to cooperate with the valve core 7 for use.

[0025] In this embodiment, by Figure 1-2As shown, the electromagnetic drive assembly is fixed to a shell 19 on the left side of the valve body 1, a sealing gasket 20 is provided on the left side of the shell 19, a left nut 21 threadedly connected to the shell 19 is provided on the left side of the sealing gasket 20, a cavity 22 is provided in the shell 19, a coil assembly 23 is provided on the wall of the cavity 22, a sleeve 24 is provided on the inner ring of the coil assembly 23, a static iron core 25 is fixed in the sleeve 24, a moving iron core 26 is slidably provided at the other end of the sleeve 24, the moving iron core 26 blocks the sealing nozzle 27 through a spring 28, a hole is opened in the middle side of the sealing nozzle 27, the hole communicates with the pilot hole 6 and the valve cavity 2 on the right side of the valve core 7, the sealing nozzle 27 is arranged in the middle of the pilot hole 6, the moving iron core 26 can block the pilot hole 6 from communicating with the valve cavity 2 on the right side of the valve core 7, the spring 28 is arranged between the static iron core 25 and the moving iron core 26, when the coil assembly 23 is energized, the moving iron core When the sealing nozzle 27 is blocked by the passive iron core 26, the gas in the second air port 4 will push the valve core 7 to move to the right, thereby disconnecting the first air port 3 and the second air port 4 from the connection between the valve core 7 and the third air port 5.

[0026] In this embodiment, by Figure 1-3 As shown, the manual drive assembly includes a positioning screw 29 threadedly connected to the valve body 1, a knob 30 is fixed on the positioning screw 29, a cam 31 is fixed on the positioning screw 29, a switch sealing ring 32 is sleeved on the outer side of the positioning screw 29, and the cam 31 can cooperate with the moving iron core 26. When the electromagnetic drive assembly is accidentally stuck, the active knob 30 is used, and the knob 30 drives the cam 31 to support the moving iron core 26, and the pilot hole 6 can also be connected to the valve cavity 2 on the right side of the valve core 7. When it needs to be closed, the knob 30 is still turned to disengage the cam 31 from the moving iron core 26, and the moving iron core 26 will be pushed by the spring 28 to block the sealing nozzle 27.

[0027] In this embodiment, by Figure 1-2 As shown, a filter assembly 33 fixed on the valve body 1 is provided at the first gas port 3 at the bottom, which is used to filter impurities in the gas to prevent impurities from entering the solenoid valve and affecting the use of the solenoid valve. A retaining ring 34 is provided at the first gas port 3.

[0028] In this embodiment, by Figure 1-2 As shown, the right sleeve of the valve core 7 is provided with a tail sealing ring 35, which is used to cooperate with the tail block on the right side of the valve core 7 to disconnect the connection between the valve chamber 2 on the left side of the tail block and the valve chamber 2 on the right side of the tail block, thereby ensuring that the gas in the valve chamber 2 on the left side of the tail block of the valve core 7 can enter the valve chamber 2 on the right side of the tail block only through the pilot hole 6.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pilot-operated solenoid valve, comprising a valve body, characterized in that: A valve cavity is provided in the valve body, a first air port, a second air port and a third air port connected to the valve cavity are provided on the valve body, a pilot hole connected to the third air port is provided in the valve body, a valve core is slidably arranged in the valve cavity, the left side of the pilot hole is connected to the third air port and the valve cavity, the right side of the pilot hole is connected to the valve cavity on the right side of the valve core, the second air port is provided with a detachable plugging assembly, a sealing assembly is installed on the valve core, an electromagnetic drive assembly is provided on the right side of the valve body, a manual drive assembly is provided on the valve body, and the electromagnetic drive assembly and the manual drive assembly cooperate with each other.

2. A pilot-operated solenoid valve according to claim 1, characterized in that: The sealing assembly includes a connecting nut threadedly connected to the valve body, the connecting nut is arranged at the second air port, the inner ring of the connecting nut is inlaid with a hexagonal screw plug through a sealing gasket, an air inlet hole is opened in the middle position of the hexagonal screw plug, the air inlet hole is connected to the valve cavity through the second air port, and a first sealing ring is fixed on the connecting nut.

3. A pilot-operated solenoid valve according to claim 1, characterized in that: A second sealing ring fixed on the valve body is arranged in the valve cavity.

4. A pilot-operated solenoid valve according to claim 1, characterized in that: The sealing assembly includes two first sealing rings sleeved on the valve core, a sealing member is arranged between the two first sealing rings, a connecting end ring is sleeved on the valve core, the connecting end ring is located on the left side of the first sealing ring, a part of the connecting end ring is located between the first sealing ring and the valve core, an adjusting gasket is arranged on the left side of the connecting end ring, and a locking nut threadedly connected to the valve core is arranged on the left side of the adjusting gasket.

5. The pilot-operated solenoid valve according to claim 1, characterized in that: The electromagnetic drive assembly is fixed to the shell on the left side of the valve body, a sealing gasket is provided on the left side of the shell, a left nut threadedly connected to the shell is provided on the left side of the sealing gasket, a cavity is provided in the shell, a coil assembly is provided on the wall of the cavity, a sleeve is provided on the inner ring of the coil assembly, a static iron core is fixed in the sleeve, a moving iron core is slidably provided at the other end of the sleeve, the moving iron core blocks the sealing mouth through a spring, the sealing mouth is provided in the middle of the pilot hole, the moving iron core can block the pilot hole from connecting to the valve cavity on the right side of the valve core, and the spring is provided between the static iron core and the moving iron core.

6. The pilot-operated solenoid valve according to claim 1, characterized in that: The manual drive assembly includes a positioning screw threadedly connected to the valve body, a knob is fixed on the positioning screw, a cam is fixed on the positioning screw, a switch sealing ring is sleeved on the outer side of the positioning screw, and the cam can cooperate with the moving iron core.

7. The pilot-operated solenoid valve according to claim 5, characterized in that: A filter assembly fixed on the valve body is arranged at the first air port, and a retaining ring is arranged at the first air port.

8. The pilot-operated solenoid valve according to claim 1, characterized in that: The right part of the valve core is sleeved with a tail sealing ring.

Images