Normally closed solenoid valve

Abstract

The utility model discloses a normally closed electromagnetic valve. The normally-closed electromagnetic valve comprises a shell with an air channel, a valve rod, a valve, a first spring and a locking device, the valve rod is installed on the shell, the valve is installed on the valve rod and used for opening or closing the air channel, the first spring is used for resetting the valve rod, and the locking device comprises a limiting rod, an installation pipe, a second spring and an electromagnetic coil. The installation pipe is installed on the shell, the electromagnetic coil is installed on the installation pipe, the limiting rod is horizontally arranged in the installation pipe in a sliding mode, the second spring is arranged in the installation pipe and used for resetting the limiting rod, the valve rod is arranged in the limiting rod in a penetrating mode, and the limiting rod is used for limiting the valve rod from falling back. The normally closed electromagnetic valve is low in power consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of gas valves, in particular to a normally closed solenoid valve. Background Art

[0002] The normally closed gas safety valve is a safety device installed in the pipeline of natural gas and combustible gas equipment. During normal use, the valve is in an open state, and the valve stem is in a high position. When the electromagnetic coil is powered off, the valve stem falls back under the action of the spring to close the valve. Since the valve stem needs to be kept in a high position during normal use, the electromagnetic coil needs to be powered on all the time. The electromagnetic coil provides magnetic attraction to the valve stem to keep it in a high position. The electromagnetic coil needs to pull the entire valve stem, the valve, and the elastic force of the spring that needs to offset the valve stem reset. It requires a large magnetic force to pull, which means that the electromagnetic coil needs to consume a large amount of power. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a normally closed electromagnetic valve with low power consumption.

[0004] To solve the above problems, the utility model provides a normally closed solenoid valve, which includes a shell having an airway, a valve stem, a valve, a first spring and a locker, wherein the valve stem is installed on the shell, the valve is installed on the valve stem, the valve is used to open or close the airway, the first spring is used to reset the valve stem, the locker includes a limit rod, a mounting tube, a second spring and an electromagnetic coil, the mounting tube is installed on the shell, the electromagnetic coil is installed on the mounting tube, the limit rod is horizontally slidably arranged in the mounting tube, the second spring is placed in the mounting tube, the second spring is used to reset the limit rod, the valve stem is inserted in the limit rod, and the limit rod is used to limit the valve stem from falling back.

[0005] Furthermore, a limiting step is provided on the valve stem, and the limiting step cooperates with the limiting rod to limit the valve stem from falling back.

[0006] Furthermore, a through hole is arranged on the limit rod, and the valve stem is arranged in the through hole.

[0007] Furthermore, a ventilation groove is provided on the outer surface of the limit rod, and the ventilation groove is arranged axially, one end of the ventilation groove is located inside the mounting tube, and the other end of the ventilation groove is located outside the mounting tube, and a ventilation hole is provided on the limit rod, and the ventilation hole is extended from the end surface of the inner end of the limit rod toward the outer end, and the ventilation groove is connected with the ventilation hole through a connecting hole.

[0008] Furthermore, a handle is provided at the upper end of the valve stem.

[0009] Furthermore, a valve cap is provided on the housing, and the valve cap is detachably mounted on the housing, and the valve cap covers the handle.

[0010] Furthermore, a limit plate is provided at the lower end of the valve stem, and a ring block is provided at the edge of the limit plate.

[0011] Furthermore, the valve stem is fixed to the valve via a locking member.

[0012] Furthermore, the shell includes an upper valve body and a lower valve body, the upper valve body is mounted on the lower valve body, the lower valve body is provided with an air passage, the upper end of the first spring is abutted against the upper valve body, the valve stem is passed through the upper valve body, the upper end of the valve stem passes through the upper valve body and is connected to the handle, the lower end of the valve stem passes through the upper valve body and is connected to the valve, and a limiting groove is provided on the upper valve body.

[0013] Furthermore, a guide sleeve is provided on the upper valve body, the material of the guide sleeve is the same as that of the valve stem, and the valve stem is arranged in the guide sleeve.

[0014] The normally closed solenoid valve of the utility model utilizes the electromagnetic coil to utilize the magnetic force to pull the limit rod, so that the limit rod restricts the valve stem from falling back, and the electromagnetic coil only needs to pull the limit rod and the second spring. Since the volume of the limit rod is smaller than the volume of the valve stem, and the limit rod is arranged horizontally, and the valve stem is arranged vertically, the electromagnetic coil only needs to pull the limit rod and overcome the elastic force of the second spring, and there is no need to pull the valve stem and the valve and overcome the elastic force of the first spring. In this way, the required magnetic force can be reduced, so that the electromagnetic coil only needs less power consumption, which is lower than the existing functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a preferred implementation mode of the normally closed solenoid valve of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure of the valve stem and the limit rod when the valve stem is reset.

[0017] Figure 3 It is a structural diagram of the valve stem.

[0018] Figure 4 It is a cross-sectional view of the valve stem.

[0019] Figure 5 It is a schematic diagram of the structure of the locking member.

[0020] Figure 6 It is a structural schematic diagram of the limit rod.

[0021] Figure 7 It is an axial cross-sectional view of the limiting rod.

[0022] The meanings of the symbols in the accompanying drawings are:

[0023] Shell 1, upper valve body 11, airway 111, lower valve body 12, limit groove 121, guide sleeve 13, valve cap 2, valve stem 3, limit step 30, upper connecting section 31, limit matching section 32, lower connecting section 33, valve 4, first spring 5, locker 6, limit rod 61, through hole 611, ventilation groove 612, ventilation hole 613, connecting hole 614, mounting tube 62, second spring 63, electromagnetic coil 64, handle 7, limit plate 8, ring block 81, locking piece 9, anti-slip part 91. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, a preferred embodiment of the normally closed solenoid valve of the utility model comprises a housing 1, a valve cap 2, a valve stem 3, a valve 4, a first spring 5 and a lock 6. The housing has an air passage 111 for gas to pass through. The valve 4 is fixed on the valve stem 3. The valve 4 is used to open or close the air passage 111. The first spring 5 is sleeved on the valve stem 3. The lower end of the first spring 5 abuts against the valve stem 3. The upper end of the first spring 5 abuts against the housing 1. The first spring 5 is used to reset the valve stem 3. The valve stem 3 is installed in the housing 1. The upper end of the valve stem 3 extends out of the housing 1. A handle 7 is fixed to the upper end of the valve stem 3. The handle 7 is provided to increase the contact area and facilitate lifting. The valve cap 2 is detachably mounted on the housing 1. The valve cap 2 covers the handle 7 to ensure that the valve cap 2 cannot be lifted when the valve cap 2 is not opened. That is, the valve stem 3 can only be lifted by pulling the handle 7 after the valve cap 2 is opened. The locker 6 is installed on the housing 1, and the locker 6 is also linked with the valve stem 3; when the locker 6 is energized, the locker 6 limits the valve stem 3 from falling back, so that the valve 4 remains in the state of opening the airway 111, and the first spring 5 is compressed at this time; when the locker 6 is de-energized, the locker 6 is disengaged from the valve stem 3, and the valve stem 3 is reset under the drive of the first spring 5, and the valve stem 3 drives the valve 4 to reset, that is, the valve 4 closes the airway 111; when it needs to be opened again, the locker 6 is energized, and then the valve cap 2 is opened, and then the handle 7 is pulled, and after the valve stem 3 is pulled to a predetermined position, the locker 6 can automatically limit the valve stem 3 to prevent the valve stem 3 from falling back.

[0026] like Figures 3 to 5As shown, a limit plate 8 is provided at the lower end of the valve stem 3, and the limit plate 8 is used to limit the valve 4 to prevent the valve 4 from turning up. An annular stopper 81 is provided at the edge of the limit plate 8, and the annular stopper 81 is used to limit the first spring 5 to prevent the first spring 5 from shaking. The valve stem 3 is fixed to the valve 4 through a locking member 9, and the locking member 9 is screwed on the valve stem 3. The locking member 9 has an anti-slip portion 91, and the anti-slip portion 91 is used to prevent the valve 4 from falling off. The anti-slip portion 91 cooperates with the limit plate 8 to clamp and fix the valve 4 on the valve stem 3. A limit step 30 is provided on the valve stem 3, and the locker 6 cooperates with the limit step 30 to limit the valve stem 3. The valve stem 3 includes an upper connecting section 31, a position limiting matching section 32 and a lower connecting section 33. The position limiting matching section 32 is a cone. The diameter of the upper connecting section 31 is larger than the diameter of the position limiting matching section 32 near one end of the upper connecting section 31, so that a position limiting step 30 is formed at the connection between the upper connecting section 31 and the position limiting matching section 32. The handle 7 is installed on the upper connecting section 31, and the lower connecting section 33 is connected to the valve 4.

[0027] Combination Figure 6 and Figure 7 For reference, the lock 6 includes a limit rod 61, a mounting tube 62, a second spring 63 and an electromagnetic coil 64. The electromagnetic coil 64 is a coil commonly used in electromagnetic valves, and the electromagnetic coil 64 is mounted on one end of the mounting tube 62, and the other end of the mounting tube 62 is detachably mounted on the housing. The limit rod 61 is slidably arranged in the mounting tube 62, and the outer end of the limit rod 61 extends into the housing and the valve stem 3 is inserted into the limit rod 61. The limit step 30 of the valve stem 3 cooperates with the valve stem 3 to limit the valve stem 3. The end of the limit rod 61 located outside the mounting tube 62 is the outer end, and the end of the limit rod 61 located inside the mounting tube 62 is the inner end. The second spring 63 is installed in the mounting tube 62, and one end of the second spring 63 abuts against the inner end of the limit rod 61. When the electromagnetic coil 64 is energized, the electromagnetic coil 64 uses magnetic force to provide a suction force to the limit rod 61, that is, there is always a force applied to the limit rod 61 in the direction of the mounting tube 62, ensuring that the limit rod 61 always maintains contact with the valve stem 3. When the limit step 30 is located above the limit rod 61, the limit rod 61 will cooperate with the limit step 30 to limit the valve stem 3.

[0028] The limiting rod 61 is provided with a through hole 611, the diameter of which is the same as the diameter of the upper connecting section 31 of the valve stem 3, so as to ensure that the valve stem 3 can be reset and fall back. In other embodiments, the diameter of the through hole 611 may also be larger than the diameter of the upper connecting section 31 of the valve stem 3. The outer surface of the limiting rod 61 is provided with a venting groove 612, which is arranged axially, one end of which is located inside the mounting tube 62, and the other end of which is located outside the mounting tube 62. The limiting rod 61 is provided with a venting hole 613, which is arranged extending from the end surface of the inner end of the limiting rod 61 toward the outer end, and the venting groove 612 is connected with the venting hole 613 through a connecting hole 614. The ventilation groove 612 is connected to the ventilation hole 613, so that when the limiting rod 61 moves into the mounting tube 62, the air in the mounting tube 62 can be smoothly discharged from the mounting tube 62, and the limiting rod 61 will not be unable to move into the mounting tube 62 due to the inability to discharge the air in the mounting tube 62.

[0029] The housing includes an upper valve body 11 and a lower valve body 12, wherein the upper valve body 11 is mounted on the lower valve body 12, and the lower valve body 12 is provided with an air passage 111, the upper end of the first spring 5 is abutted against the upper valve body 11, the valve stem 3 is penetrated on the upper valve body 11, the upper end of the valve stem 3 penetrates the upper valve body 11 and is connected to the handle 7, and the lower end of the valve stem 3 penetrates the upper valve body 11 and is connected to the valve 4. A limiting groove 121 is provided on the upper valve body 11, and the upper end of the first spring 5 is placed in the limiting groove 121 to limit the first spring 5 and prevent the first spring 5 from shaking. A mounting hole is provided on the upper valve body 11, and the mounting pipe 62 of the lock 6 is installed in the mounting hole. A guide sleeve 13 is provided on the upper valve body 11, and the valve stem 3 is arranged in the guide sleeve 13. The material of the guide sleeve 13 is the same as that of the valve stem 3, which can reduce the wear of the valve stem 3 and the upper valve body 11 and extend the service life. Generally speaking, the valve stem 3 needs to be made of a high-strength alloy. A guide sleeve 13 of the same material is provided at the contact position between the valve stem 3 and the upper valve body 11, so that the upper valve body 11 can be made of a relatively ordinary aluminum alloy material, thereby reducing the manufacturing cost.

[0030] During normal use, the valve stem 3 is lifted, and the electromagnetic coil 64 is energized to keep the limit rod 61 always attached to the limit step 30, ensuring that the valve stem 3 will not fall back. When the electromagnetic coil 64 is powered off, the limit rod 61 is reset under the action of the second spring 63, so that the axis of the through hole 611 coincides with the axis of the valve stem 3, and the valve stem 3 is reset under the action of the first spring 5, and the valve stem 3 drives the valve 4 to reset from closing the airway 111. The volume of the limit rod 61 is smaller than that of the valve stem 3, and the limit rod 61 is arranged horizontally, and the valve stem 3 is arranged vertically. The electromagnetic coil 64 only needs to pull the limit rod 61 and overcome the elastic force of the second spring 63, without pulling the valve stem 3 and the valve 4 and overcoming the elastic force of the first spring 5. In this way, the required magnetic force can be reduced, so that the electromagnetic coil 64 also only needs a smaller power consumption, which is lower than the existing function.

[0031] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.

Claims

1. A normally closed solenoid valve, characterized in that: It includes a shell with an airway, a valve stem, a valve, a first spring and a locker, the valve stem is installed on the shell, the valve is installed on the valve stem, the valve is used to open or close the airway, the first spring is used to reset the valve stem, the locker includes a limit rod, a mounting tube, a second spring and an electromagnetic coil, the mounting tube is installed on the shell, the electromagnetic coil is installed on the mounting tube, the limit rod is horizontally slidably arranged in the mounting tube, the second spring is placed in the mounting tube, the second spring is used to reset the limit rod, the valve stem is inserted in the limit rod, and the limit rod is used to limit the valve stem from falling back.

2. The normally closed solenoid valve according to claim 1, characterized in that: The valve stem is provided with a limiting step, and the limiting step cooperates with the limiting rod to limit the valve stem from falling back.

3. The normally closed solenoid valve according to claim 1, characterized in that: The limiting rod is provided with a through hole, and the valve stem is penetrated in the through hole.

4. The normally closed solenoid valve according to claim 1, characterized in that: The outer surface of the limiting rod is provided with a ventilation groove, which is arranged axially, one end of the ventilation groove is located inside the mounting tube, and the other end of the ventilation groove is located outside the mounting tube, and the limiting rod is provided with a ventilation hole, which is extended from the end surface of the inner end of the limiting rod toward the outer end, and the ventilation groove is connected with the ventilation hole through a connecting hole.

5. The normally closed solenoid valve according to claim 1, characterized in that: A handle is arranged on the upper end of the valve stem.

6. The normally closed solenoid valve according to claim 5, characterized in that: The housing is provided with a valve cap which is detachably mounted on the housing and covers the handle.

7. The normally closed solenoid valve according to claim 1, characterized in that: A limit plate is arranged at the lower end of the valve stem, and a ring block is arranged at the edge of the limit plate.

8. The normally closed solenoid valve according to claim 1, characterized in that: The valve stem is fixed to the valve via a locking member.

9. The normally closed solenoid valve according to claim 1, characterized in that: The shell includes an upper valve body and a lower valve body, the upper valve body is mounted on the lower valve body, the lower valve body is provided with an air passage, the upper end of the first spring is abutted against the upper valve body, the valve stem is passed through the upper valve body, the upper end of the valve stem passes through the upper valve body and is connected to the handle, the lower end of the valve stem passes through the upper valve body and is connected to the valve, and a limiting groove is provided on the upper valve body.

10. The normally closed solenoid valve according to claim 9, characterized in that: A guide sleeve is arranged on the upper valve body. The material of the guide sleeve is the same as that of the valve stem. The valve stem is arranged in the guide sleeve.

Images