Patent Application
20200149526
The present application claims priority to Chinese patent application No. 201811335107.6 filed on Nov. 10, 2018. All contents of the above patent application are hereby incorporated by reference in their entirety.
The present invention belongs to the technical field of diaphragm pumps, and more particularly relates to a quick-exhaust diaphragm pump.
Diaphragm pumps are commonly used to supply compressed air to pressurized targets such as a sphygmomanometer. A diaphragm pump is a pump which conveys air to a pressurized target by deforming a diaphragm portion made of an elastomeric material.
At present, the Chinese patent with the Notification number of CN1288344C discloses a diaphragm pump. The diaphragm pump comprises at least one diaphragm portion forming a pump chamber, a driving portion arranged at the diaphragm portion, a suction valve and a discharge valve communicating with the pump chamber; the driving portion moves up and down to function as a pump; and the diaphragm pump is characterized by a diaphragm main body integrated by connecting at least one diaphragm portion by utilizing a flat portion, the suction valve arranged on the flat portion of the diaphragm main body and corresponding to each diaphragm portion, and the flat discharge valve disposed substantially in the center of the diaphragm portion.
In the prior art, the volume of a pump chamber of a diaphragm pump similar to the above-mentioned diaphragm pump is changed by the up-and-down movement of a piston to realize the supply of airflow. However, as the movement of the piston is intermittent, if the airflow generated by the movement of the piston is directly supplied to the outside by a discharge port, the supply airflow is easily unstable, and thus there is room for improvement.
In view of the deficiencies of the prior art, the present invention is aimed at providing a quick-exhaust diaphragm pump which has the advantage of capability of improving the stability of the supply airflow.
In order to achieve the above objective, the technical solution provided by the present invention is as follows: the quick-exhaust diaphragm pump comprises an upper cover body, a valve seat and a valve plate, wherein when the upper cover body is covered on the valve seat, a communication cavity is formed; an air outlet and a pressure relief opening are formed in the upper cover body; the communication cavity communicates with the air outlet and the pressure relief opening; the valve plate is arranged between the valve seat and the upper cover body; a pressure relief airbag for opening or closing the pressure relief opening is arranged on the valve plate; an air inlet passage for communicating with the pressure relief airbag and an air release passage for discharging air in the pressure relief airbag are arranged on the valve seat; a buffer seat is arranged at the lower end of the valve seat; a buffer slot is formed in the buffer seat; when the buffer seat is covered on the valve seat, a buffer space is formed by the lower surface of the valve seat and the buffer slot; and a supply passage for communicating with the buffer space and the air inlet passage is arranged on the valve seat.
By adopting the technical solution, during operation, air generated by the movement of a piston firstly enters a buffer space, and then enters into the pressure relief airbag by a supply passage and an air inlet passage, so that the pressure relief airbag gradually bulges and blocks the pressure relief opening to ensure that air entering the communication cavity is discharged only from the air outlet. When the air inflation is stopped, the air in the pressure relief airbag is gradually discharged from the air relief passage, and the pressure relief opening is gradually opened, so that the air discharged from the air outlet is discharged to the outside from the pressure relief opening, that is, the air-discharging process is completed.
In summary, before the air enters the pressure relief airbag, the air is collected into the buffer space, so as to avoid the fluctuation of the air in the pressure relief airbag during the pressurization process, and thus to improve the stability of the air supplied to the outside.
The quick-exhaust diaphragm pump is further configured to further comprise a piston device for conveying air to the supply passage, wherein the piston device comprises a piston seat arranged at the lower end of the buffer seat, a diaphragm portion located between the piston seat and the buffer seat, and a driving component for driving the diaphragm portion to incline; an air inlet is formed in the piston seat; a one-way inlet communicating with the air inlet and piston airbags located at the two sides of the one-way inlet and forming a pump chamber are arranged on the diaphragm portion.
By adopting the above technical solution, during operation, the air enters into the pump chamber via the air inlet and the one-way inlet, and the diaphragm portion is inclined by the driving component, so that the piston airbag at one inclined end is squeezed to force the air into the buffer space, and thus, the air inflation is completed.
The quick-exhaust diaphragm pump is further configured as follows: the driving component comprises a base plate in transmission connection with the piston airbags, a rotating wheel eccentrically connected to the base plate by a connecting rod, and a motor for driving the rotating wheel to rotate.
By adopting the above technical solution, the rotating wheel drives the connecting rod to reciprocate in a perpendicular direction after the motor is started, so that the base plate and the piston airbags are inclined, thereby functioning as a pump.
The quick-exhaust diaphragm pump is further configured as follows: locking holes are formed in the base plate, and locking portions clamped in the locking holes extend from the piston airbags.
By adopting the above technical solution, the locking portions are clamped in the locking holes, so as to realize the transmission connection between the base plate and the piston airbags, and thus to achieve the purpose of quick installation.
The quick-exhaust diaphragm pump is further configured as follows: the bottom of the buffer slot is provided with collecting passages communicating with the pump chamber and a one-way valve plate for preventing the reverse flow of air entering the collecting passages.
By adopting the above technical solution, during the air inflation process, the air in the pump chamber enters the buffer space from the collecting passages, and the air in the buffer space can be effectively prevented from reversely flowing by the one-way valve plate
The quick-exhaust diaphragm pump is further configured as follows: the bottom of the buffer slot is provided with a sunken portion which is sunken inwardly, and a protruding portion embedded in the sunken portion extends from the one-way valve plate.
By adopting the above technical solution, the protruding portion of the one-way valve plate is embedded in the sunken portion of the buffer seat, which can effectively prevent the one-way valve plate from being detached from the buffer slot and improve the stability of the one-way valve plate after installation.
The quick-exhaust diaphragm pump is further configured as follows: positioning blocks extending toward the valve seat are arranged at the edges of the two sides of the buffer seat, and positioning grooves in which the positioning blocks are embedded are formed in the valve seat.
By adopting the above technical solution, under the cooperation of the positioning blocks and the positioning grooves, the buffer seat can be quickly aligned with the valve seat, which is beneficial to the improvement of the installation efficiency.
The quick-exhaust diaphragm pump is further configured as follows: the inner sides of the positioning blocks are provided with guiding surfaces with low ends inclined toward the buffer slot.
By adopting the above technical solution, the design of the guiding surfaces can reduce the areas of the end portions of the positioning blocks, so that the positioning blocks can more easily enter the positioning grooves.
From the above, the quick-exhaust diaphragm pump has the following advantages:
1. Before the air enters the pressure relief airbag, the air is collected into the buffer space, so as to avoid the fluctuation of the air in the pressure relief airbag during the pressurization process, and thus to improve the stability of the air supplied to the outside.
2. By setting the one-way valve plate, the air in the buffer space can be effectively prevented from reversely flowing.
1. upper cover body; 2. valve seat; 3. valve plate; 4. air outlet; 5. pressure relief opening; 6. communicating cavity; 7. pressure relief airbag; 8. air inlet passage; 9. air relief passage; 10. buffer seat; 11. buffer slot; 12. buffer space; 13. supply passage; 14. piston device; 15. positioning block; 16. positioning groove; 17. guiding surface; 18. piston seat; 19. diaphragm portion; 20. driving component; 21. air inlet; 22. one-way inlet; 23. pump chamber; 24. piston airbag; 25. collecting passage; 26. one-way valve plate; 27. sunken portion; 28. protruding portion; 29. base plate; 30. connecting rod; 31. rotating wheel; 32. motor; 33. base; 34. locking hole; 35. locking portion.
The invention is further described in detail below with reference to the accompanying drawings.
As shown in
As shown in
Further, positioning blocks 15 extending toward the valve seat 2 are arranged at the edges of the two sides of the buffer seat 10, and positioning grooves 16 in which the positioning blocks 15 are embedded are formed in the valve seat 2; under the cooperation of the positioning blocks 15 and the positioning grooves 16, the buffer seat 10 can be quickly aligned with the valve seat 10, which is beneficial to the improvement of the installation efficiency. In addition, in order to cause the positioning blocks 15 to more easily enter the positioning grooves 16, the inner sides of the positioning blocks 15 in the embodiment are provided with guiding surfaces 17 with low ends inclined toward the buffer slot 11.
As shown in
Further, as shown in
As shown in
Specifically, as shown in
The working process and beneficial effects of the present invention are as follows: during operation, the piston airbags 24 incline by starting the motor 32, so that the volume of the pump chamber 23 is reduced to force the air into the buffer space 12 via the collecting passage 25; the air into the buffer space 12 enters into the pressure relief airbag 7 by a supply passage 13 and an air inlet passage 8, so that the pressure relief airbag 7 gradually bulges and blocks the pressure relief opening until the air entering the communication cavity 6 is discharged from the air outlet 4, that is, the supply of the air to the outside is completed. When the air inflation is stopped, the air in the pressure relief airbag 7 is gradually discharged from the air relief passage 9, and the pressure relief opening 5 is gradually opened, so that the air discharged from the air outlet 4 is discharged to the outside from the pressure relief opening 5, that is, the air-discharging process is completed.
In summary, before the air enters the pressure relief airbag 7, the air is collected into the buffer space 12, so as to avoid the fluctuation of the air in the pressure relief airbag 7 during the pressurization process, and thus to improve the stability of the air supplied to the outside.
The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, and the like which are within the scope of design concept of the present invention should be included in the protection scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201811335107.6 | Nov 2018 | CN | national |
