Solenoid valve for fuel cell

Abstract

The present application relates to a kind of electromagnetic valves for fuel cell, it relates to the technical field of electromagnetic valve, including valve block, the electromagnetic valve head assembly is press-fitted on the valve block with interference, water inlet connector for water inlet and water outlet connector for water outlet are also connected on the valve block, water inlet flow channel for connecting water inlet connector and electromagnetic valve head assembly is arranged in the valve block, water outlet flow channel for connecting water outlet connector and electromagnetic valve head assembly is arranged in the valve block, plastic shell is arranged outside the valve block, water inlet opening for water inlet connector to extend into and water outlet opening for water outlet connector to extend into are formed in the plastic shell, and it further includes heating structure for thawing, outer sealing structure and inner sealing structure for improving sealing property.The present application has the advantages of wide application range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve for fuel cells. BACKGROUND

[0002] With the development of the world economy, energy and environmental problems are becoming the focus of attention of countries, and gradually becoming the focus of technical research in the field of power systems. Fuel cells, as a new type of power device, generate electricity through the chemical reaction of hydrogen and oxygen, and the byproduct is only water, which is a relatively clean and efficient technology with broad application prospects.

[0003] However, at present, fuel cell technology is not widely used, the main reason is that the fuel cell technology has not completely broken through many technical difficulties, and the control of the hydrogen and air circulation system is one of them. The electromagnetic valve is generally used to control the on-off and flow regulation of hydrogen and air supply on the fuel cell engine, so the performance of the electromagnetic valve becomes a key point, and the quality of the electromagnetic valve is directly related to the performance of the fuel cell engine.

[0004] Since the working environment of the fuel cell engine is often outdoors, it is easy to encounter various severe weather conditions, so the electromagnetic valve needs to consider various external environments, such as low-temperature environment in winter, the waste water generated by the fuel cell engine will freeze, thereby blocking the valve port of the electromagnetic valve, resulting in the problem of unable to drain water; or in the humid environment of the plum rain season in summer, the external water vapor may enter the electromagnetic coil part of the electromagnetic valve, thereby causing the problem of short circuit of the electromagnetic valve, so a kind of electromagnetic valve suitable for severe weather is needed. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide an electromagnetic valve for fuel cells, which has the advantage of wide application range.

[0006] The above-mentioned purpose of the present application is realized by the following technical scheme:

[0007] An electromagnetic valve for fuel cells, comprising a valve block, an electromagnetic valve head assembly is interference-fitted on the valve block, a water inlet connector for water inlet and a water outlet connector for water outlet are also connected to the valve block, a water inlet flow channel for connecting the water inlet connector and the electromagnetic valve head assembly is arranged in the valve block, a water outlet flow channel for connecting the water outlet connector and the electromagnetic valve head assembly is arranged in the valve block, a plastic shell is arranged outside the valve block, a water inlet opening for the water inlet connector to extend into and a water outlet opening for the water outlet connector to extend into are formed in the plastic shell, and the heating structure for thawing, the outer sealing structure and the inner sealing structure for improving the sealing performance are also included.

[0008] The heating structure comprises side heating pieces arranged on the side of the valve block, bottom heating pieces arranged on the bottom of the valve block, and a temperature sensor arranged close to the water inlet joint.

[0009] The outer sealing structure comprises a bottom sealing ring of the water inlet joint, a middle sealing ring of the water inlet joint, a top sealing ring of the water inlet joint, a bottom sealing ring of the water outlet joint, and a middle sealing ring of the water outlet joint.

[0010] The inner sealing structure comprises a diaphragm for sealing the water inlet channel and the water outlet channel.

[0011] By using the above technical scheme, the outer sealing structure and the inner sealing structure are used for sealing, so that in a humid environment in summer, water vapor is prevented from entering the electromagnetic coil part of the electromagnetic valve, thereby reducing the probability of short circuit and expanding the application range of the electromagnetic valve.

[0012] The application further provides that the side heating pieces and the edge heating pieces are ceramic heating pieces.

[0013] The application further provides that the electromagnetic valve head assembly comprises a shell, a coil arranged in the shell, and a magnetic pole column press-fitted on the shell.

[0014] The application further provides that the diaphragm is provided with a screw, one end of the screw is inserted into the armature and is threadedly connected with the armature, and the screw is plasticized in the diaphragm through a vulcanization process.

[0015] The application further provides that the diaphragm is provided with a positioning protrusion, and the valve block is provided with a diaphragm groove for embedding the positioning protrusion.

[0016] The plastic shell is internally hollow and has an opening at one end, and a plastic cover is arranged at the opening of the plastic shell, and a sealing gasket is arranged between the plastic shell and the plastic cover.

[0017] In summary, the beneficial technical effects of the present application are:

[0018] 1. By arranging an independent ceramic heating sheet structure, the heating sheet is arranged in close contact with the valve block to quickly and effectively achieve heat conduction. In a low-temperature environment, when the water in the valve body freezes, the heat of the heating sheet directly enters the valve body through contact heat transfer, and finally realizes the thawing function, so that the electromagnetic valve can work normally in cold weather, and the application temperature range of the valve is expanded.

[0019] 2. A plurality of sealing rings are arranged at the water outlet joint and the water inlet joint to improve the overall sealing performance, thereby reducing the possibility of external humid water vapor entering the valve body and affecting the valve operation.

[0020] 3. By arranging a special diaphragm type sealing structure, a sealing ring is designed on the edge of the diaphragm and the valve block. In the case that the external environment is relatively humid in summer, water vapor can be effectively prevented from entering the electromagnetic coil part of the electromagnetic valve, thereby reducing the probability of short circuit problem. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the electromagnetic valve;

[0022] Figure 2 is a schematic diagram of the internal structure of the electromagnetic valve;

[0023] Figure 3 is a sectional view of the electromagnetic valve;

[0024] Figure 4 is a sectional view of the valve block;

[0025] Figure 5 is a sectional view of the connection state of the valve block, the water inlet joint and the water outlet joint;

[0026] Figure 6 is a schematic diagram of the structure of the diaphragm.

[0027] In the figure, 1, valve block; 11, water inlet channel; 12, water outlet channel; 13, diaphragm groove; 14, sealing ring; 2, plastic shell; 21, plastic cover; 22, sealing gasket; 3, heating structure; 31, side heating sheet; 32, edge heating sheet; 33, temperature sensor; 4, electromagnetic valve head assembly; 41, shell; 42, coil; 43, magnetic pole column; 44, armature; 45, compression spring; 46, diaphragm; 461, screw; 462, positioning protrusion; 463, sealing plane; 5, water inlet joint; 51, water inlet joint bottom sealing ring; 52, water inlet joint middle sealing ring; 53, water inlet joint top sealing ring; 6, water outlet joint; 61, water outlet joint bottom sealing ring; 62, water outlet joint middle sealing ring; 7, water inlet; 8, water outlet. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1 The application discloses an electromagnetic valve for fuel cells, which comprises a hollow plastic shell 2 with an open end, a plastic cover 21 arranged at the open end of the plastic shell 2, a sealing gasket 22 between the plastic shell and the plastic cover 21, and fixing bolts inserted into the plastic shell for fixation. The sealed plastic shell 2 can effectively block the connection between the valve body and the outside, thereby realizing the function of protecting the valve body.

[0030] Reference Figure 2 And Figure 3 A valve block 1 is placed in the plastic shell 2, a water inlet joint 5 is threadedly connected to the top of the valve block 1, a water outlet joint 6 is threadedly connected to the bottom of one side of the valve block 1, a water inlet 7 and a water outlet 8 are formed in the plastic shell 2, the end of the water inlet joint 5 away from the valve block 1 extends out of the water inlet 7, and the end of the water outlet joint 6 away from the valve block 1 extends out of the water outlet 8. An electromagnetic valve head assembly 4 is interference-fitted on one side of the valve block 1, the side where the water outlet joint 6 is located is adjacent to the side where the electromagnetic valve head assembly 4 is located, a water inlet channel 11 and a water outlet channel 12 are formed in the valve block 1, one end of the water inlet channel 11 is in communication with the water inlet joint 5, the other end is in communication with the electromagnetic valve head assembly 4, one end of the water outlet channel 12 is in communication with the water outlet joint 6, and the other end is in communication with the electromagnetic valve head assembly 4.

[0031] Reference Figure 5The water inlet joint 5 is coaxially sleeved with a water inlet joint bottom sealing ring 51, a water inlet joint middle sealing ring 52 and a water inlet joint top sealing ring 53. The water inlet joint bottom sealing ring 51 is located at one end of the water inlet joint 5 extending into the valve block 1, and is used for sealing the bottom of the water inlet joint 5 and the valve block 1. The water inlet joint middle sealing ring 52 is located at the water inlet 7, and the outer wall of the water inlet joint middle sealing ring 52 is tightly abutted against the inner wall of the water inlet 7, and is used for radially sealing the water inlet joint 5 and the plastic shell. The water inlet joint top sealing ring 53 is located outside the plastic shell 2 and abuts against the outer wall of the plastic shell 2, and is used for stabilizing the water inlet joint 5. The water outlet joint 6 is coaxially sleeved with a water outlet joint bottom sealing ring 61 and a water outlet joint middle sealing ring 62. The water outlet joint bottom sealing ring 61 is located at one end of the water outlet joint 6 extending into the valve block 1, and is used for sealing the bottom of the water inlet joint 5 and the valve block 1. The water outlet joint middle sealing ring 62 is located at the water outlet 8, and the outer wall of the water outlet joint middle sealing ring 62 is tightly abutted against the inner wall of the water outlet 8, and is used for radially sealing the water inlet joint 5 and the plastic shell. The sealing performance of the electromagnetic valve as a whole is improved by means of the plurality of sealing rings, which reduces the possibility of internal leakage to the outside and reduces the possibility of external water vapor entering the inside.

[0032] With reference to Figure 2 and Figure 3 The valve block 1 is fixedly connected with a side heating sheet 31 on the side surface away from the electromagnetic valve head assembly 4, and is fixedly connected with a side heating sheet 32 on the side surface away from the water outlet joint 6. The side heating sheet 31 and the side heating sheet 32 are arranged in close contact with the valve block 1, and are connected with each other. In this embodiment, the side heating sheet 31 and the side heating sheet 32 are both ceramic heating sheets. The valve block 1 is further provided with a temperature sensor 33 which is inserted into the inside of the valve block 1 from one side surface of the valve block 1, and the end of the temperature sensor 33 inserted into the valve block 1 is adjacent to the water inlet joint 5, so that the position of the temperature sensor 33 is close to the position of the water inlet joint 5 to the inside of the valve block 1. Since the water accumulated at the bottom of the water inlet 7 is the main source of ice formation, by arranging the temperature sensor 33 at the position of the water inlet 7, the temperature at the bottom of the water inlet 7 can be accurately monitored to the maximum, thereby providing accurate input conditions for the thawing control strategy. The side heating sheet 31, the side heating sheet 32 and the temperature sensor 33 jointly constitute a heating structure 3 for thawing. When the water in the valve body is frozen, the ceramic heating sheet works, and the ice can be thawed in a short time, so that the valve restores the flow function.

[0033] With reference to Figure 3 and Figure 4, the electromagnetic valve head assembly 4 comprises an inner hollow shell 41, both ends of the shell 41 are open, the shell 41 is internally fitted with a coil 42, the shell 41 is interference-pressed with a magnetic pole column 43 at one end opening, the coil 42 is wound on the magnetic pole column 43, so as to close the coil 42 inside the shell 41. The magnetic pole column 43 is fixedly connected with a compression spring 45 at one end extending into the shell 41, the compression spring 45 is fixedly connected with an armature 44 at one end away from the magnetic pole column 43, the armature 44 and the magnetic pole column 43 jointly extrude the compression spring 45, so that the compression spring 45 is always in a compressed state. The armature 44 is threadedly connected with a diaphragm 46 at one end away from the magnetic pole column 43, the diaphragm 46 is disc-shaped, the diaphragm 46 is provided with a screw 461 at the axial center, one end of the screw 461 is inserted into the armature 44, so that the diaphragm 46 is threadedly connected with the armature 44, and the screw 461 is plasticized inside the diaphragm 46 through a vulcanization process.

[0034] With reference to Figure 5 and Figure 6 , the diaphragm 46 is provided with an annular positioning protrusion 462 at the periphery, the valve block 1 is provided with a diaphragm groove 13 for embedding the positioning protrusion 462, and the side of the valve block 1 in contact with the diaphragm 46 is provided with a sealing ring 14, and the diaphragm 46 is provided with a sealing plane 463 for embedding the sealing ring 14. After the electromagnetic valve head assembly 4 is assembled, the electromagnetic valve head assembly 4 is interference-fitted on the valve block 1, and when interference-fitted, the positioning protrusion 462 at the edge of the diaphragm 46 enters the diaphragm groove 13 on the valve block 1, and at the same time, the sealing ring 14 at the edge of the valve block 1 is in close contact with the sealing plane 463 on the diaphragm 46, so as to realize the sealing of the valve block 1 part and the electromagnetic head part.

[0035] The implementation principle of the embodiment is that: in the initial position, the armature 44 is in the valve closing position under the action of the compression spring 45, the spring pre-tightening force ensures that the diaphragm 46 is tightly attached to the valve seat, thereby realizing the sealing of the valve seat position. In the energized state, the electromagnetic force drives the armature 44 to move to the side of the magnetic pole column 43 against the spring force, and at the same time, the armature 44 drives the diaphragm 46 to move away from the valve seat, so that the diaphragm 46 is separated from the valve seat, and the valve is opened. The water and waste gas in the water inlet connector 5 and the flow channel flow out from the valve port, pass through the water outlet connector 6, and are discharged to the outside, thereby realizing the drainage and exhaust functions. Regardless of the open or closed state of the valve, the edge of the diaphragm 46 is always pressed between the valve block 1 and the electromagnetic head shell 41, the edge of the diaphragm 46 is deformed, thereby sealing the fluid part and the electromagnetic part of the drainage and exhaust electromagnetic valve, so that in the summer, the probability of short circuit caused by water vapor entering the electromagnetic coil 42 part of the electromagnetic valve in the relatively humid environment is reduced, and the application range of the electromagnetic valve is expanded. In the winter low-temperature environment, the temperature inside the valve block 1 can be detected by the temperature sensor 33, and when the temperature sensor 33 detects that the temperature is lower than a certain value, the heating function is started by means of the heating sheet to thaw, so that the electromagnetic valve can be applied to the low-temperature environment, and the application range of the electromagnetic valve is further expanded.

[0036] The embodiments of the present application are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, and thus: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A solenoid valve for fuel cell, comprising a valve block (1), a solenoid valve head assembly (4) is interference-pressed on the valve block (1), a water inlet connector (5) for water inlet and a water outlet connector (6) for water outlet are connected to the valve block (1), a water inlet flow channel (11) for connecting the water inlet connector (5) and the solenoid valve head assembly (4) is arranged in the valve block (1), a water outlet flow channel (12) for connecting the water outlet connector (6) and the solenoid valve head assembly (4) is arranged in the valve block (1), characterized in that: The valve block (1) is externally provided with a plastic shell (2), the plastic shell (2) is provided with a water inlet (7) for the water inlet joint (5) to extend into and a water outlet (8) for the water outlet joint (6) to extend into, further comprising a heating structure (3) for thawing, an outer sealing structure and an inner sealing structure for improving sealing; The side heating sheet (31) is fixedly connected to the side of the valve block (1) away from the electromagnetic valve head assembly (4), the edge heating sheet (32) is fixedly connected to the side of the valve block (1) away from the water outlet joint (6), the side heating sheet (31) and the edge heating sheet (32) are arranged close to the valve block (1), and the side heating sheet (31) and the edge heating sheet (32) are connected; the temperature sensor (33) is further arranged on the valve block (1) and is inserted into the valve block (1) from one side of the valve block (1), and one end of the temperature sensor (33) inserted into the valve block (1) is adjacent to the water inlet joint (5), so that the position of the temperature sensor (33) is close to the position of the water inlet joint (5) to water into the valve block (1). The outer sealing structure comprises a water inlet joint bottom sealing ring (51), a water inlet joint middle sealing ring (52), a water inlet joint top sealing ring (53) arranged on the water inlet joint (5) and a water outlet joint bottom sealing ring (61), a water outlet joint middle sealing ring (62) arranged on the water outlet joint (6), the water inlet joint bottom sealing ring (51) is located at one end of the water inlet joint (5) extending into the valve block (1), the water inlet joint middle sealing ring (52) is located at the water inlet (7), the water inlet joint top sealing ring (53) abuts against the outer wall of the plastic shell (2), the water outlet joint bottom sealing ring (61) is located at one end of the water outlet joint (6) extending into the valve block (1), and the water outlet joint middle sealing ring (62) is located at the water outlet (8). The inner sealing structure comprises a diaphragm (46) for plugging the water inlet flow channel (11) and the water outlet flow channel (12), the diaphragm (46) is located at the connection between the electromagnetic valve head assembly (4) and the valve block (1), one side of the valve block (1) in contact with the diaphragm (46) is provided with a sealing ring belt (14), and the diaphragm (46) is provided with a sealing plane (463) for embedding the sealing ring belt (14). The plastic shell (2) is hollow and has an opening at one end, the plastic shell (2) is provided with a plastic cover (21) at the opening, and there is a sealing gasket (22) between the plastic shell and the plastic cover (21).

2. The electromagnetic valve for a fuel cell according to claim 1, wherein: The side heating sheet (31) and the edge heating sheet (32) are both ceramic heating sheets.

3. The electromagnetic valve for a fuel cell according to claim 1, wherein: The electromagnetic valve head assembly (4) comprises a shell (41), a coil (42) arranged in the shell (41), and a magnetic pole column (43) press-fitted on the shell (41), the coil (42) is arranged outside the magnetic pole column (43), one end of the shell (41) away from the magnetic pole column (43) is provided with an armature (44), a compression spring (45) in a compression state at all times is arranged between the armature (44) and the magnetic pole column (43), and one side of the armature (44) facing the valve block (1) is connected with the diaphragm (46).

4. The electromagnetic valve for a fuel cell according to claim 3, wherein: Said diaphragm (46) is provided with a screw (461), one end of which is inserted into the armature (44) and is threadedly connected with the armature (44), and the screw (461) is plasticized in the diaphragm (46) through a vulcanization process.

5. The electromagnetic valve for a fuel cell according to claim 3, wherein: Said diaphragm (46) is provided with a positioning protrusion (462) at the periphery, and the valve block (1) is provided with a diaphragm groove (13) for embedding the positioning protrusion (462).

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