A normally closed oxygen supply solenoid valve

Abstract

The present invention discloses a normally closed oxygen supply solenoid valve, which includes a valve body, a guiding component, an electromagnetic control device, and a plunger component. The valve body includes an upper valve body, a middle valve body, and a lower valve body that are connected in sequence. The middle valve body is provided with a gas passing hole; the guiding component includes a guiding seat, a cover body, and a liquid storage cavity, and the guiding seat is provided with a guiding channel; the electromagnetic control device is arranged on the cover body, and the electromagnetic control device includes a moving iron core and a fixed iron core. An annular placement groove is opened at one end of the fixed iron core close to the moving iron core, and a buffer washer is arranged in the annular placement groove; the plunger component includes a connecting seat, a plunger rod, and an elastic member. A first plug is arranged on the plunger rod, and a second plug is arranged at one end of the plunger rod away from the connecting seat. The wear and noise caused by the sliding of the connecting seat and the guiding seat are reduced. The arrangement of the annular placement groove and the buffer washer plays a role of buffering and vibration absorption when the moving iron core and the fixed iron core attract each other, and well meets the low-noise requirement in the oxygen supply environment.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a normally closed oxygen supply solenoid valve. Background Art

[0002] A solenoid valve is a basic automation component for controlling fluids. The solenoid valve can cooperate with different circuits to achieve the expected control, and both the control accuracy and flexibility can be guaranteed. Therefore, solenoid valves are usually used to control the oxygen supply flow rate, concentration, and time during clinical oxygen supply.

[0003] The main working principle of the existing solenoid valves on the market is to utilize 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, so as to realize the opening and closing or flow control of the solenoid valve. Under this structure, when the moving iron core moves towards the fixed iron core, the moving iron core will eventually hit the fixed iron core and stop its movement. During the sudden impact and stop process of the moving iron core and the fixed iron core, it will cause the solenoid valve to generate collision noise. At the same time, the collision is likely to cause wear of the moving iron core and the fixed iron core, thus reducing the service life of the solenoid valve. During clinical medical oxygen supply, it usually needs to last for a certain period of time, and the noise generated by the solenoid valve during oxygen supply will affect the patient 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, in view of the deficiencies of the existing technology, the main purpose of the present invention is to provide a normally closed oxygen supply solenoid valve. By providing a guide seat for guiding the connecting seat, the plunger rod can move precisely up and down. At the same time, through the cooperation of the liquid storage cavity and the ball, the connecting seat and the guide seat can smoothly slide and cooperate, reducing the wear and noise caused by the sliding between the connecting seat and the guide seat. Moreover, the cooperation between the air inlet cavity and the first plug, and the cooperation between the air outlet cavity and the second plug enable the solenoid valve to transfer energy smoothly when opening and closing, playing a buffering role. At the same time, the setting of the annular placement groove and the buffer gasket can avoid overly reducing the magnetic flux area, ensuring that the solenoid valve has sufficient magnetic force to operate, playing a buffering and vibration-absorbing role 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 object, the present invention adopts the following technical solutions:

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

[0008] A valve body, which includes an upper valve body, a middle valve body, and a lower valve body connected in sequence. The bottom of the upper valve body is concavely provided with an air inlet cavity upwards. The top of the upper valve body is concavely provided with a first groove. The first groove is provided with a first avoidance hole communicating with the air inlet cavity. An air inlet passage communicating with the air inlet cavity is provided beside the upper valve body. The top of the lower valve body is concavely provided with an air outlet cavity downwards. An air outlet passage communicating with the air outlet cavity is provided beside the lower valve body. The middle valve body is provided with a through hole communicating with the air inlet cavity and the air outlet cavity;

[0009] A guiding component, which includes a guiding seat, a cover body, and a liquid storage cavity for storing lubricating oil. The guiding seat is provided with a guiding channel. The liquid storage cavity is arranged on the outer periphery of the guiding seat. The guiding seat is provided with an oil passing hole communicating with the guiding channel and the liquid storage cavity. A ball is arranged at one end of the oil passing hole close to the guiding channel. The cover body fixes the guiding seat and the liquid storage cavity in the first groove. The cover body is provided with a liquid injection hole communicating with the liquid storage cavity;

[0010] An electromagnetic control device, which is arranged on the cover body. The electromagnetic control device includes 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. A buffer washer protruding outside the annular placement groove is arranged in the annular placement groove;

[0011] A plunger component, which includes a connecting seat, a plunger rod, and an elastic member. The connecting seat is movably arranged in the guiding channel. The connecting seat is connected to one end of the moving iron core away from the fixed iron core. The plunger rod is connected to one end of the connecting seat away from the moving iron core. A first plug is arranged on the plunger rod. 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 one end of the through hole close to the air inlet cavity. A second plug is arranged at one end of the plunger rod away from the connecting seat. The second plug is provided with a plurality of air outlet holes communicating with the through hole and the air outlet cavity. The moving iron core can drive the second plug to block one 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, installation edges extend from both sides of the bottom of the lower valve body, and installation holes are provided on the installation edges.

[0014] As a preferred solution, a second groove is concavely provided on the top of the cover body. A first sealing washer is arranged in the second groove. The guiding seat fixes the first sealing washer in the second groove. A third groove is concavely provided at the bottom of the first groove. A second sealing washer is arranged in the third groove. The guiding seat and the liquid storage cavity together fix the second sealing washer in the third groove.

[0015] As a preferred solution, a fourth groove is recessed downward from the top of the middle valve body, and a fifth groove is recessed upward from the bottom of the middle valve body. The air passage hole communicates the fourth groove and the fifth groove.

[0016] As a preferred solution, an annular groove is formed on the plunger rod, the first plug is sleeved in the annular groove, and an abutting wall extends from the outer periphery of the first plug. Correspondingly, a sixth groove is recessed from the top of the air inlet cavity, and two ends of the elastic member respectively abut against the abutting 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 socket part is arranged at one end of the plunger rod away from the connecting seat. Correspondingly, the second plug is provided with a socket groove, and the second plug is fixed on the plunger rod through the cooperation of the socket groove and the socket part, 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 holes are in an "L" shape, and a plurality of air outlet holes are arranged around the plunger rod.

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

[0020] As a preferred solution, the electromagnetic control device further includes a bobbin, a coil, and an iron shell. The iron shell fixes the bobbin on the cover body. The bobbin 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, as can be seen from the above technical solutions:

[0022] Mainly, by providing a guide seat for guiding the connecting seat, the plunger rod can move up and down precisely. At the same time, through the cooperation of the liquid storage cavity and the ball, the sliding fit between the connecting seat and the guide seat is smooth, reducing the wear and noise caused by the sliding between the connecting seat and the guide seat. Moreover, the cooperation between the air inlet cavity and the first plug, and the cooperation between the air outlet cavity and the second plug enable the solenoid valve to transfer energy smoothly when opening and closing, playing a buffering role. At the same time, the setting of the annular placement groove and the buffer gasket can avoid excessively reducing the magnetic flux area, ensuring that the solenoid valve has sufficient magnetic force to operate, playing a buffering and vibration-absorbing role 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.

[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. Socket part

[0049] 43. Elastic member 44. First plug

[0050] 441. Abutting wall 45. Second plug

[0051] 451. Air outlet hole 452. Socket groove

[0052] 50. Second sealing washer 60. Liquid injection pipe

[0053] 61. Rubber stopper 70. First sealing washer

[0054] 80. Buffer washer. Detailed implementation manner

[0055] First of all, it should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

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

[0057] The valve body 10 includes an upper valve body 11, a middle valve body 12 and a lower valve body 13 which are connected in sequence. The bottom of the upper valve body 11 is recessed upward to form an air inlet cavity 111. The top of the upper valve body 11 is recessed to form a first groove 112. The first groove 112 is provided with a first avoidance hole 113 communicating with the air inlet cavity 111. An air inlet passage 114 communicating with the air inlet cavity 111 is provided beside the upper valve body 11. The top of the lower valve body 13 is recessed downward to form an air outlet cavity 131. An air outlet passage 132 communicating with the air outlet cavity 131 is provided beside the lower valve body 13. The middle valve body 12 is provided with a through hole 121 communicating with the air inlet cavity 111 and the air outlet cavity 131;

[0058] Specifically, refer to Figure 1As shown, mounting edges 133 extend from both sides of the bottom of the lower valve body 13, and mounting holes 134 are formed in 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] Refer to Figure 3 As shown, a third groove 115 is recessed at the bottom of the first groove 112, and a second sealing washer 50 is arranged in the third groove 115;

[0060] Refer to Figure 4 As shown, a fourth groove 122 is recessed downward from the top of the middle valve body 12, and a fifth groove 123 is recessed upward from the bottom of the middle valve body 12. The air passage hole 121 communicates the fourth groove 122 and the fifth groove 123.

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

[0062] Specifically, refer to Figure 2 As shown, a liquid injection pipe 60 is inserted into the liquid injection hole 221. The bottom of the liquid injection pipe 60 extends into the liquid storage cavity 23. A rubber plug 61 is detachably arranged at one end of the liquid injection pipe 60 away from the liquid storage cavity 23; Refer to Figure 3 As shown, a second groove 222 is recessed at the top of the cover body 22. A first sealing washer 70 is arranged in the second groove 222. The guiding seat 21 fixes the first sealing washer 70 in the second groove 222. The guiding seat 21 and the liquid storage cavity 23 together fix the second sealing washer 50 in the third groove 115.

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

[0064] Specifically, refer to Figure 2As shown, the electromagnetic control device 30 further includes a framework 33, a coil 34, and an iron shell 35. The iron shell 35 fixes the framework 33 on the cover body 22. The framework 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 far 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 guiding channel 211. The connecting seat 41 is connected to one end of the moving iron core 31 far from the fixed iron core 32. The plunger rod 42 is connected to one end of the connecting seat 41 far from the moving iron core 31. Both the plunger rod 42 and the moving iron core 31 are fixed to the connecting seat 41 by structural adhesive. A first plug 44 is arranged on the plunger rod 42. Two ends of the elastic member 43 respectively abut against the top of the air inlet cavity 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 one end of the air passing hole 121 close to the air inlet cavity 111. A second plug 45 is arranged at one end of the plunger rod 42 far from the connecting seat 41. The second plug 45 is provided with a plurality of air outlet holes 451 communicating the air passing hole 121 and the air outlet cavity 131. The moving iron core 31 can drive the second plug 45 to block one end of the air passing hole 121 far from the air inlet cavity 111.

[0066] Specifically, referring to Figure 4 As shown, an annular groove 421 is formed on the plunger rod 42. 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 concavely formed on the top of the air inlet cavity 111. Two ends of the elastic member 43 respectively abut against the abutting wall 441 and the sixth groove 116. The bottom of the first plug 44 can abut against the bottom wall of the fourth groove 122. A socket part 422 is arranged at one end of the plunger rod 42 far from the connecting seat 41. Correspondingly, the second plug 45 is provided with a socket groove 452. The second plug 45 is fixed to the plunger rod 42 through the cooperation of the socket groove 452 and the socket part 422. The top of the second plug 45 can abut against the top wall of the fifth groove 123. In this embodiment, the air outlet holes 451 are 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 upward movement of the moving iron core 31 drives the first plug 44 away from the air vent 121. At the same time, the second plug 45 approaches the air vent 121. Gas can flow from the intake passage 114 into the air vent 121 and then flow into the air outlet cavity 131 through the air outlet hole 451 on the second plug 45, and finally flow out through the air outlet passage 132. The solenoid valve is in the open state for ventilation. When the coil 34 is de-energized, the moving iron core 31 falls back under the reset action of the elastic member 43 until the first plug 44 fits against the air vent 121 again to block the gas flow. The solenoid valve is in the closed state and the gas cannot flow through.

[0069] The design focus of the present invention lies in:

[0070] Specifically, by providing a guide seat for guiding the connecting seat, the plunger rod can move up and down precisely. At the same time, through the cooperation of the liquid storage cavity and the ball, the connecting seat and the guide seat can smoothly slide and cooperate, reducing the wear and noise caused during sliding between the connecting seat and the guide seat. Moreover, the cooperation between the intake cavity and the first plug, and the cooperation between the air outlet cavity and the second plug enable the solenoid valve to transfer energy smoothly when opening and closing, playing a buffering role. At the same time, the setting 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, playing a buffering and vibration-absorbing role when the moving iron core and the fixed iron core attract each other, and further reducing the generation of noise, well meeting the low-noise requirements in the oxygen supply environment.

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

Claims

1. A normally closed oxygen supply solenoid valve, characterized in that, Comprising: A valve body, the valve body includes 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 upward to form an air inlet cavity. The top of the upper valve body is recessed to form a first groove. The first groove is provided with a first avoidance hole communicating with the air inlet cavity. An air inlet passage communicating with the air inlet cavity is provided beside the upper valve body. The top of the lower valve body is recessed downward to form an air outlet cavity. An air outlet passage communicating with the air outlet cavity is provided beside the lower valve body. The middle valve body is provided with an air passage hole communicating the air inlet cavity and the air outlet cavity. A guiding assembly, the guiding assembly includes a guiding seat, a cover body, and a liquid storage cavity for storing lubricating oil. The guiding seat is provided with a guiding channel. The liquid storage cavity is arranged on the outer periphery of the guiding seat. The guiding seat is provided with an oil passage hole communicating the guiding channel and the liquid storage cavity. A ball is arranged at one end of the oil passage hole close to the guiding channel. The cover body fixes the guiding seat and the liquid storage cavity in the first groove. The cover body is provided with a liquid injection hole communicating the liquid storage cavity. An electromagnetic control device, the electromagnetic control device is arranged on the cover body. The electromagnetic control device includes a moving iron core and a fixed iron core. An annular placement groove is formed at one end of the fixed iron core close to the moving iron core. A buffer gasket protruding outside the annular placement groove is arranged in the annular placement groove. A plunger assembly, the plunger assembly includes a connecting seat, a plunger rod, and an elastic member. The connecting seat is movably arranged in the guiding channel. The connecting seat is connected to one end of the moving iron core away from the fixed iron core. The plunger rod is connected to one end of the connecting seat away from the moving iron core. A first plug is arranged on the plunger rod. 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 one end of the air passage hole close to the air inlet cavity. A second plug is arranged at one end of the plunger rod away from the connecting seat. The second plug is provided with a plurality of air outlet holes communicating the air passage hole and the air outlet cavity. The moving iron core can drive the second plug to block one end of the air passage hole away from the air inlet cavity.

2. The normally-closed oxygen supply solenoid valve according to claim 1, wherein The upper valve body is fixed to the lower valve body through screws passing through the middle valve body.

3. The normally-closed oxygen supply solenoid valve according to claim 1, characterized in that, Installation edges extend from both sides of the bottom of the lower valve body. Installation holes are provided on the installation edges.

4. The normally-closed oxygen supply solenoid valve according to claim 1, wherein A second groove is recessed on the top of the cover body. A first sealing gasket is arranged in the second groove. The guiding 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 arranged in the third groove. The guiding seat and the liquid storage cavity together fix the second sealing gasket in the third groove.

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

6. The normally-closed oxygen supply solenoid valve according to claim 5, characterized in that, An annular groove is formed on the plunger rod. The first plug is sleeved in the annular groove. An abutting wall extends from the outer periphery of the first plug. Correspondingly, a sixth groove is recessed on the top of the air inlet cavity. Two ends of the elastic member respectively abut against the abutting wall and the sixth groove. 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, One end of the plunger rod away from the connecting seat is provided with a socket part. Correspondingly, the second plug is provided with a socket groove, and the second plug is fixed on the plunger rod through the cooperation of the socket groove and the socket part. 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. The normally closed oxygen supply solenoid valve according to claim 1, characterized in that, A liquid injection pipe is inserted into the liquid injection hole. The bottom of the liquid injection pipe extends into the liquid storage cavity, and a rubber plug is detachably arranged at one end of the liquid injection pipe 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 further includes a skeleton, a coil, and an iron shell. The iron shell fixes the skeleton on the cover body. The skeleton 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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