Normally closed oxygen supply electromagnetic valve

Abstract

The normally-closed oxygen supply electromagnetic valve comprises a valve body, a guide assembly, an electromagnetic control device and a plunger assembly, the valve body comprises an upper valve body, a middle valve body and a lower valve body which are sequentially connected, and an air passing hole is formed in the middle valve body; the guide assembly comprises a guide seat, a cover body and a liquid storage cavity, and the guide seat is provided with a guide channel; the electromagnetic control device is arranged on the cover body and comprises a movable iron core and a fixed iron core, an annular placement groove is formed in the end, close to the movable iron core, of the fixed iron core, and a buffer gasket is arranged in the annular placement groove; the plunger assembly comprises a connecting base, a plunger rod and an elastic piece, a first plug is arranged on the plunger rod, and a second plug is arranged at the end, away from the connecting base, of the plunger rod. The abrasion and noise caused by the connecting base and the guide base during sliding are reduced, the annular containing groove and the buffering gasket are arranged, the buffering and vibration absorbing effects are achieved when the movable iron core and the fixed iron core attract each other, and the low-noise requirement in the oxygen supply environment is well met.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic valve technology, in particular to a normally closed oxygen supply electromagnetic valve. Background Art

[0002] Solenoid valves are basic automation components used to control fluids. Solenoid valves can be used in conjunction with different circuits to achieve the desired control, while the accuracy and flexibility of control can be guaranteed. Therefore, solenoid valves are usually used to control the flow, concentration and time of oxygen supply during clinical oxygen supply.

[0003] The main working principle of the solenoid valve on the existing market is to use the electromagnetic force generated by the electromagnetic coil, and then the fixed iron core generates magnetic force to attract the moving iron core to move, thereby realizing the switching or flow control of the solenoid valve. For the solenoid valve under this structure, when the moving iron core moves toward the fixed iron core, the moving iron core will eventually collide with the fixed iron core to stop the movement of the moving iron core. In the process of the sudden collision and stop of the moving iron core and the fixed iron core, the solenoid valve will generate collision noise. At the same time, the collision can easily cause the moving iron core and the fixed iron core to wear, thereby reducing the service life of the solenoid valve. Clinical medical oxygen supply usually needs to last for a certain period of time. The noise generated by the solenoid valve during oxygen supply will affect the patient's experience and cannot meet the noise reduction requirements of the ward.

[0004] Therefore, it is necessary to design a new technical solution to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a normally closed oxygen supply solenoid valve, which is provided with a guide seat for guiding the connecting seat so that the plunger rod can move up and down accurately, and at the same time, through the cooperation of the liquid storage cavity and the ball, the connecting seat and the guide seat can slide and cooperate smoothly, reducing the wear and noise caused by the sliding of the connecting seat and the guide seat, and the cooperation between the air inlet cavity and the first plug, and the cooperation between the air outlet cavity and the second plug, so that the solenoid valve can smoothly transfer energy when opening and closing, and play a buffering role. At the same time, the provision of the annular placement groove and the buffer gasket can avoid excessively reducing the area of ​​the magnetic flux, ensuring that the solenoid valve has sufficient magnetic force to operate, and plays a role of buffering and absorbing vibration when the moving iron core and the fixed iron core attract each other, further reducing the generation of noise, and well meeting the low noise requirements in the oxygen supply environment.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A normally closed oxygen supply solenoid valve, comprising:

[0008] The valve body comprises an upper valve body, a middle valve body and a lower valve body connected in sequence, the bottom of the upper valve body is recessed with an air inlet cavity upwards, the top of the upper valve body is recessed with a first groove, the first groove is provided with a first avoidance hole connected to the air inlet cavity, the side of the upper valve body is provided with an air inlet passage connected to the air inlet cavity, the top of the lower valve body is recessed with an air outlet cavity downwards, the side of the lower valve body is provided with an air outlet passage connected to the air outlet cavity, and the middle valve body is provided with an air hole connecting the air inlet cavity and the air outlet cavity;

[0009] A guide assembly, the guide assembly comprising a guide seat, a cover body, and a liquid storage cavity for storing lubricating oil, the guide seat being provided with a guide channel, the liquid storage cavity being provided at the outer periphery of the guide seat, the guide seat being provided with an oil through hole connecting the guide channel and the liquid storage cavity, a ball being provided at one end of the oil through hole close to the guide channel, the cover body fixing the guide seat and the liquid storage cavity in a first groove, and the cover body being provided with a liquid injection hole connecting the liquid storage cavity;

[0010] An electromagnetic control device, the electromagnetic control device is arranged on the cover body, the electromagnetic control device comprises a moving iron core and a fixed iron core, an annular placement groove is provided at one end of the fixed iron core close to the moving iron core, and a buffer gasket protruding from the annular placement groove is arranged in the annular placement groove;

[0011] The plunger assembly comprises a connecting seat, a plunger rod and an elastic member, the connecting seat is movably arranged in the guide channel, the connecting seat is connected to the end of the moving iron core away from the fixed iron core, the plunger rod is connected to the end of the connecting seat away from the moving iron core, a first plug is arranged on the plunger rod, the two ends of the elastic member respectively abut against the top of the air inlet cavity and the first plug, the elastic restoring force of the elastic member can drive the first plug to block the end of the through hole close to the air inlet cavity, a second plug is arranged at the end of the plunger rod away from the connecting seat, the second plug is provided with a plurality of air outlet holes connected to the through hole and the air outlet cavity, and the moving iron core can drive the second plug to block the end of the through hole away from the air inlet cavity.

[0012] As a preferred solution, the upper valve body is fixed to the lower valve body by screws passing through the middle valve body.

[0013] As a preferred solution, mounting edges extend from both sides of the bottom of the lower valve body, and mounting holes are formed on the mounting edges.

[0014] As a preferred embodiment, a second groove is recessed on the top of the cover body, a first sealing gasket is disposed in the second groove, the guide seat fixes the first sealing gasket in the second groove, a third groove is recessed on the bottom of the first groove, a second sealing gasket is disposed in the third groove, and the guide seat and the liquid storage cavity together fix the second sealing gasket in the third groove.

[0015] As a preferred solution, a fourth groove is recessed downwardly at the top of the middle valve body, a fifth groove is recessed upwardly at the bottom of the middle valve body, and the air hole connects the fourth groove and the fifth groove.

[0016] As a preferred embodiment, an annular groove is provided on the plunger rod, the first plug is sleeved in the annular groove, an abutment wall extends from the outer periphery of the first plug, and accordingly, a sixth groove is recessed at the top of the air inlet cavity, the two ends of the elastic member respectively abut against the abutment wall and the sixth groove, and the bottom of the first plug can abut against the bottom wall of the fourth groove.

[0017] As a preferred solution, a sleeve portion is provided at one end of the plunger rod away from the connecting seat, and correspondingly, the second plug is provided with a sleeve groove, and the second plug is fixed to the plunger rod through the cooperation between the sleeve groove and the sleeve portion, and the top of the second plug can abut against the top wall of the fifth groove.

[0018] As a preferred solution, the air outlet is in an "L" shape, and a plurality of air outlets are arranged around the plunger rod.

[0019] As a preferred solution, an injection tube is inserted into the injection hole, the bottom of the injection tube extends into the liquid storage cavity, and a rubber plug is detachably provided at one end of the injection tube away from the liquid storage cavity.

[0020] As a preferred embodiment, the electromagnetic control device also includes a frame, a coil, and an iron shell, wherein the iron shell fixes the frame to the cover body, the frame includes an inner cavity and an outer cavity separated from the inner cavity, the moving iron core is movably arranged at one end of the inner cavity close to the cover body, the fixed iron core is arranged at one end of the inner cavity away from the cover body, and the coil is arranged in the outer cavity.

[0021] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0022] Mainly, a guide seat is provided for guiding the connecting seat, so that the plunger rod can move up and down accurately, and at the same time, the connection seat and the guide seat can slide and cooperate smoothly through the cooperation of the liquid storage cavity and the ball, thereby reducing the wear and noise caused by the sliding of the connecting seat and the guide seat. In addition, the cooperation between the air inlet cavity and the first plug, as well as the cooperation between the air outlet cavity and the second plug, can smoothly transfer energy when the solenoid valve is opened and closed, thereby playing a buffering role. At the same time, the provision of the annular placement groove and the buffer gasket can avoid excessively reducing the area of ​​the magnetic flux, thereby ensuring that the solenoid valve has sufficient magnetic force to operate, and plays a role of buffering and absorbing vibration when the moving iron core and the fixed iron core attract each other, thereby further reducing the generation of noise, thus meeting the low-noise requirements in the oxygen supply environment well.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side view schematic diagram of a preferred embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional schematic diagram of a preferred embodiment of the present invention;

[0026] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle.

[0028] Description of the accompanying drawings:

[0029] 10. Valve body 11. Upper valve body

[0030] 111. air inlet cavity 112. first groove

[0031] 113. First avoidance hole 114. Air intake passage

[0032] 115, third groove 116, sixth groove

[0033] 12. Middle valve body 121. Air hole

[0034] 122, fourth groove 123, fifth groove

[0035] 13. Lower valve body 131. Air outlet cavity

[0036] 132, air outlet channel 133, installation edge

[0037] 134, mounting hole 20, guide assembly

[0038] 21. Guide seat 211. Guide channel

[0039] 212, oil hole 213, ball

[0040] 22. Cover 221. Liquid injection hole

[0041] 222, second groove 23, liquid storage cavity

[0042] 30. Electromagnetic control device 31. Moving iron core

[0043] 32. Fixed iron core 321. Annular placement groove

[0044] 33. Skeleton 331. Inner cavity

[0045] 332, outer cavity 34, coil

[0046] 35. Iron shell 40. Plunger assembly

[0047] 41. Connecting seat 42. Plunger rod

[0048] 421, annular groove 422, sleeve connection portion

[0049] 43. Elastic member 44. First plug

[0050] 441, abutment wall 45, second plug

[0051] 451, vent hole 452, socket groove

[0052] 50. Second sealing gasket 60. Liquid injection tube

[0053] 61. Rubber plug 70. First sealing gasket

[0054] 80. Buffer washer. DETAILED DESCRIPTION

[0055] First of all, it should be noted that in the description of the present invention, the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0056] Please refer to Figures 1 to 4 As shown, it shows the specific structure of a preferred embodiment of the present invention, including a valve body 10, a guide assembly 20, an electromagnetic control device 30 and a plunger assembly 40.

[0057] The valve body 10 comprises an upper valve body 11, a middle valve body 12 and a lower valve body 13 connected in sequence, the bottom of the upper valve body 11 is recessed with an air inlet cavity 111, the top of the upper valve body 11 is recessed with a first groove 112, the first groove 112 is provided with a first avoidance hole 113 connected to the air inlet cavity 111, the side of the upper valve body 11 is provided with an air inlet passage 114 connected to the air inlet cavity 111, the top of the lower valve body 13 is recessed with an air outlet cavity 131, the side of the lower valve body 13 is provided with an air outlet passage 132 connected to the air outlet cavity 131, and the middle valve body 12 is provided with an air hole 121 connected to the air inlet cavity 111 and the air outlet cavity 131;

[0058] Specifically, see Figure 1As shown, mounting edges 133 extend from both sides of the bottom of the lower valve body 13, and mounting holes 134 are provided on the mounting edges 133. In this embodiment, the upper valve body 11 is fixed to the lower valve body 13 by screws passing through the middle valve body 12;

[0059] See also Figure 3 As shown, a third groove 115 is recessed at the bottom of the first groove 112, and a second sealing gasket 50 is disposed in the third groove 115;

[0060] See also Figure 4 As shown, a fourth groove 122 is recessed downwardly at the top of the middle valve body 12 , a fifth groove 123 is recessed upwardly at the bottom of the middle valve body 12 , and the air hole 121 communicates the fourth groove 122 and the fifth groove 123 .

[0061] The guide assembly 20 includes a guide seat 21, a cover 22, and a liquid storage cavity 23 for storing lubricating oil. The guide seat 21 is provided with a guide channel 211. The liquid storage cavity 23 is arranged on the outer periphery of the guide seat 21. The guide seat 21 is provided with an oil hole 212 connecting the guide channel 211 and the liquid storage cavity 23. A ball 213 is provided at one end of the oil hole 212 close to the guide channel 211. The cover 22 fixes the guide seat 21 and the liquid storage cavity 23 in the first groove 112. The cover 22 is provided with a liquid injection hole 221 connecting the liquid storage cavity 23.

[0062] Specifically, see Figure 2 As shown, a liquid injection tube 60 is inserted into the liquid injection hole 221, and the bottom of the liquid injection tube 60 extends into the liquid storage cavity 23. A rubber plug 61 is detachably provided at one end of the liquid injection tube 60 away from the liquid storage cavity 23; see Figure 3 As shown, a second groove 222 is recessed on the top of the cover body 22, a first sealing gasket 70 is disposed in the second groove 222, the guide seat 21 fixes the first sealing gasket 70 in the second groove 222, and the guide seat 21 and the liquid storage cavity 23 together fix the second sealing gasket 50 in the third groove 115.

[0063] The electromagnetic control device 30 is disposed on the cover body 22, and includes a moving iron core 31 and a fixed iron core 32. An annular placement groove 321 is provided at one end of the fixed iron core 32 close to the moving iron core 31, and a buffer washer 80 protruding out of the annular placement groove 321 is provided in the annular placement groove 321;

[0064] Specifically, see Figure 2As shown, the electromagnetic control device 30 also includes a skeleton 33, a coil 34, and an iron shell 35. The iron shell 35 fixes the skeleton 33 on the cover body 22. The skeleton 33 includes an inner cavity 331 and an outer cavity 332 separated from the inner cavity 331. The moving iron core 31 is movably arranged at one end of the inner cavity 331 close to the cover body 22, the fixed iron core 32 is arranged at one end of the inner cavity 331 away from the cover body 22, and the coil 34 is arranged in the outer cavity 332.

[0065] The plunger assembly 40 includes a connecting seat 41, a plunger rod 42 and an elastic member 43. The connecting seat 41 is movably arranged in the guide channel 211. The connecting seat 41 is connected to the end of the moving iron core 31 away from the fixed iron core 32. The plunger rod 42 is connected to the end of the connecting seat 41 away from the moving iron core 31. The plunger rod 42 and the moving iron core 31 are fixed to the connecting seat 41 by structural glue. A first plug 44 is arranged on the plunger rod 42. The two ends of the elastic member 43 are respectively against the air inlet cavity. The top of the connecting seat 111 and the first plug 44, the elastic member 43 is a spring, the elastic restoring force of the elastic member 43 can drive the first plug 44 to block the end of the air hole 121 close to the air inlet cavity 111, the end of the plunger rod 42 away from the connecting seat 41 is provided with a second plug 45, the second plug 45 is provided with a plurality of air outlet holes 451 connected to the air hole 121 and the air outlet cavity 131, and the moving iron core 31 can drive the second plug 45 to block the end of the air hole 121 away from the air inlet cavity 111;

[0066] Specifically, see Figure 4 As shown, an annular groove 421 is provided on the plunger rod 42, and the first plug 44 is sleeved in the annular groove 421. An abutting wall 441 extends from the outer periphery of the first plug 44. Correspondingly, a sixth groove 116 is recessed at the top of the air inlet chamber 111, and the two ends of the elastic member 43 respectively abut against the abutting wall 441 and the sixth groove 116, and the bottom of the first plug 44 can abut against the bottom wall of the fourth groove 122; a sleeve portion 422 is provided at the end of the plunger rod 42 away from the connecting seat 41, and correspondingly, a sleeve groove 452 is provided on the second plug 45, and the second plug 45 is fixed to the plunger rod 42 by the cooperation of the sleeve groove 452 and the sleeve portion 422, and the top of the second plug 45 can abut against the top wall of the fifth groove 123; in this embodiment, the air outlet 451 is in an "L" shape, and a plurality of air outlet holes 451 are arranged around the plunger rod 42.

[0067] The working principle of this embodiment is described in detail as follows:

[0068] When the coil 34 is energized, the fixed iron core 32 generates a magnetic force to attract the moving iron core 31 to move upward. The moving iron core 31 moves upward and drives the first plug 44 to leave the air hole 121. At the same time, the second plug 45 approaches the air hole 121. The gas can flow from the air inlet channel 114 to the air hole 121, and then flow into the air outlet cavity 131 from the air outlet hole 451 on the second plug 45, and finally flow out from the air outlet channel 132. The solenoid valve is in an open state for ventilation; when the coil 34 is de-energized, the moving iron core 31 falls back under the resetting action of the elastic member 43 until the first plug 44 re-attaches to the air hole 121 to block the gas circulation. The solenoid valve is in a closed state and the gas cannot circulate.

[0069] The design emphasis of the present invention is:

[0070] Mainly, a guide seat is provided for guiding the connecting seat, so that the plunger rod can move up and down accurately, and at the same time, the connection seat and the guide seat can slide and cooperate smoothly through the cooperation of the liquid storage cavity and the ball, thereby reducing the wear and noise caused by the sliding of the connecting seat and the guide seat. In addition, the cooperation between the air inlet cavity and the first plug, as well as the cooperation between the air outlet cavity and the second plug, can smoothly transfer energy when the solenoid valve is opened and closed, thereby playing a buffering role. At the same time, the provision of the annular placement groove and the buffer gasket can avoid excessively reducing the area of ​​the magnetic flux, thereby ensuring that the solenoid valve has sufficient magnetic force to operate, and plays a role of buffering and absorbing vibration when the moving iron core and the fixed iron core attract each other, thereby further reducing the generation of noise, thus meeting the low-noise requirements in the oxygen supply environment well.

[0071] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A normally closed oxygen supply solenoid valve, characterized in that: include: The valve body comprises an upper valve body, a middle valve body and a lower valve body connected in sequence, the bottom of the upper valve body is recessed with an air inlet cavity upwards, the top of the upper valve body is recessed with a first groove, the first groove is provided with a first avoidance hole connected to the air inlet cavity, the side of the upper valve body is provided with an air inlet passage connected to the air inlet cavity, the top of the lower valve body is recessed with an air outlet cavity downwards, the side of the lower valve body is provided with an air outlet passage connected to the air outlet cavity, and the middle valve body is provided with an air hole connecting the air inlet cavity and the air outlet cavity; A guide assembly, the guide assembly comprising a guide seat, a cover body, and a liquid storage cavity for storing lubricating oil, the guide seat being provided with a guide channel, the liquid storage cavity being provided at the outer periphery of the guide seat, the guide seat being provided with an oil through hole connecting the guide channel and the liquid storage cavity, a ball being provided at one end of the oil through hole close to the guide channel, the cover body fixing the guide seat and the liquid storage cavity in a first groove, and the cover body being provided with a liquid injection hole connecting the liquid storage cavity; An electromagnetic control device, the electromagnetic control device is arranged on the cover body, the electromagnetic control device comprises a moving iron core and a fixed iron core, an annular placement groove is provided at one end of the fixed iron core close to the moving iron core, and a buffer gasket protruding from the annular placement groove is arranged in the annular placement groove; The plunger assembly comprises a connecting seat, a plunger rod and an elastic member, the connecting seat is movably arranged in the guide channel, the connecting seat is connected to the end of the moving iron core away from the fixed iron core, the plunger rod is connected to the end of the connecting seat away from the moving iron core, a first plug is arranged on the plunger rod, the two ends of the elastic member respectively abut against the top of the air inlet cavity and the first plug, the elastic restoring force of the elastic member can drive the first plug to block the end of the through hole close to the air inlet cavity, a second plug is arranged at the end of the plunger rod away from the connecting seat, the second plug is provided with a plurality of air outlet holes connected to the through hole and the air outlet cavity, and the moving iron core can drive the second plug to block the end of the through hole away from the air inlet cavity.

2. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: The upper valve body is fixed on the lower valve body by screws passing through the middle valve body.

3. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: Mounting edges are extended from both sides of the bottom of the lower valve body, and mounting holes are formed on the mounting edges.

4. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: A second groove is recessed on the top of the cover body, a first sealing gasket is disposed in the second groove, the guide seat fixes the first sealing gasket in the second groove, a third groove is recessed on the bottom of the first groove, a second sealing gasket is disposed in the third groove, and the guide seat and the liquid storage cavity together fix the second sealing gasket in the third groove.

5. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: The top of the middle valve body is concavely provided with a fourth groove downward, the bottom of the middle valve body is concavely provided with a fifth groove upward, and the air hole communicates with the fourth groove and the fifth groove.

6. A normally closed oxygen supply solenoid valve according to claim 5, characterized in that: An annular groove is provided on the plunger rod, the first plug is sleeved in the annular groove, an abutment wall extends from the outer periphery of the first plug, and correspondingly, a sixth groove is recessed on the top of the air inlet cavity, the two ends of the elastic member abut against the abutment wall and the sixth groove respectively, and the bottom of the first plug can abut against the bottom wall of the fourth groove.

7. A normally closed oxygen supply solenoid valve according to claim 5, characterized in that: A sleeve portion is provided at one end of the plunger rod away from the connecting seat, and correspondingly, the second plug is provided with a sleeve groove. The second plug is fixed to the plunger rod through the cooperation between the sleeve groove and the sleeve portion, and the top of the second plug can abut against the top wall of the fifth groove.

8. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: The air outlet hole is in an "L" shape, and a plurality of air outlet holes are arranged around the plunger rod.

9. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: A liquid injection tube is inserted into the liquid injection hole, the bottom of the liquid injection tube extends into the liquid storage cavity, and a rubber plug is detachably provided at one end of the liquid injection tube away from the liquid storage cavity.

10. A normally closed oxygen supply solenoid valve according to claim 1, characterized in that: The electromagnetic control device also includes a frame, a coil, and an iron shell. The iron shell fixes the frame to the cover body. The frame includes an inner cavity and an outer cavity separated from the inner cavity. The moving iron core is movably arranged at one end of the inner cavity close to the cover body, the fixed iron core is arranged at one end of the inner cavity away from the cover body, and the coil is arranged in the outer cavity.

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