Positive and negative pressure vacuum pump

Abstract

The utility model provides a positive and negative pressure vacuum pump which comprises an upper cover body, a positive pressure cavity is formed in the inner side of the upper cover body, a negative pressure cavity is formed in the outer side of the upper cover body, the negative pressure cavity is communicated with air through an air inlet hole and a negative pressure relief hole, and the positive pressure cavity is communicated with air through a positive pressure relief hole and an exhaust hole; the diaphragm and the motor assembly are fixedly connected, the diaphragm is movably matched with a diaphragm fixing seat, the diaphragm fixing seat is fixedly connected with the upper cover body, and the diaphragm is driven by the motor assembly to do lifting motion; a positive and negative pressure exchange cavity is formed in the inner side of the diaphragm, and a closed cavity is formed in the outer side of the diaphragm fixing seat; in the lifting process of the diaphragm, the negative pressure cavity is communicated with the positive pressure cavity through the positive and negative pressure exchange cavity and the closed cavity; and when the diaphragm completes the ascending action, the negative pressure cavity is communicated with the closed cavity, and the positive and negative pressure exchange cavity is communicated with the positive pressure cavity. Positive and negative pressure adjustment can be achieved, multi-pump combination is not needed, and operation is convenient and fast.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump technical field, concretely is a positive and negative pressure vacuum pump. BACKGROUND

[0002] In many fields of modern industrial production, scientific research and daily life, vacuum pumps, as a key device capable of generating, improving and maintaining vacuum environment, play a crucial role. With the continuous development of various industries and the continuous progress of technology, the performance requirements of vacuum pumps are increasingly improved, not only requiring high efficient and stable pumping capacity, but also expecting to adapt to diversified working scenarios, realizing flexible switching and precise control of positive and negative pressure.

[0003] However, the existing vacuum pump technology gradually exposes a series of limitations when facing these increasingly complex demands. Traditional vacuum pump design often focuses on the realization of single function, that is, either focusing on the generation of positive pressure environment or striving to create negative pressure environment, and it is difficult to simultaneously consider both positive and negative pressure functions on the same device. This single function makes it necessary to use multiple different types of vacuum pumps when both positive and negative pressure operations are required in actual application, which not only increases the cost, but also greatly increases the complexity of the system, increasing the difficulty of maintenance and management. SUMMARY

[0004] In view of the above technical problems, the utility model provides a positive and negative pressure vacuum pump, which does not need multiple pumps to be combined, changes the communication relationship between the chambers by controlling the lifting of the diaphragm, and realizes smooth switching of positive and negative pressure.

[0005] The utility model discloses the following technical scheme to realize the technical purpose:

[0006] A positive and negative pressure vacuum pump comprises:

[0007] An upper cover body, the inner side of the upper cover body is provided with a positive pressure chamber, and the outer side is provided with a negative pressure chamber, the negative pressure chamber is communicated with air through an air inlet hole and a negative pressure relief hole, and the positive pressure chamber is communicated with air through a positive pressure relief hole and an air outlet hole;

[0008] A diaphragm and a motor assembly, the diaphragm and the motor assembly are fixedly connected, and the diaphragm is movably matched with a diaphragm fixing seat, the diaphragm fixing seat and the upper cover body are fixedly connected, and the diaphragm moves up and down under the driving of the motor assembly; the inner side of the diaphragm is provided with a positive and negative pressure exchange chamber, and the outer side of the diaphragm fixing seat is provided with a closed chamber; during the lifting process of the diaphragm, the negative pressure chamber is communicated with the positive pressure chamber through the positive and negative pressure exchange chamber and the closed chamber; when the diaphragm completes the lifting action, the negative pressure chamber and the closed chamber are communicated, and the positive and negative pressure exchange chamber and the positive pressure chamber are communicated.

[0009] Preferably, the positive pressure relief hole and the exhaust hole are arranged on the upper side and the lower side of the positive pressure pipe respectively, a one-way valve is arranged at the communication position of the exhaust hole and the positive pressure pipe, and the negative pressure relief hole is arranged on the upper side of the negative pressure pipe.

[0010] More preferably, the pipe openings of the positive pressure pipe and the negative pressure pipe are provided with adaptive pressure regulating screws, and the pressure regulating screws are used for adjusting the sectional area of the gas flow of the positive pressure relief hole and the negative pressure relief hole.

[0011] Preferably, the upper cover fixing seat is further provided with relief holes and first air flow holes on the inner side and the outer side respectively, and a one-way valve is arranged on the upper cover fixing seat and is adapted to the relief holes, and the one-way valve is used for limiting the one-way flow of the air flow.

[0012] More preferably, the outer side of the diaphragm is provided with a second air flow hole corresponding to the position of the first air flow hole.

[0013] More preferably, during the lifting of the diaphragm, the negative pressure cavity is communicated with the positive and negative pressure exchange cavity through the first air flow hole and is communicated with the closed cavity through the first air flow hole and the second air flow hole, the positive and negative pressure exchange cavity is communicated with the positive pressure cavity through the relief hole, and the closed cavity is communicated with the positive pressure cavity through the second air flow hole and the relief hole; when the diaphragm completes the lifting action and the upper cover fixing seat is attached, the negative pressure cavity is communicated with the closed cavity through the first air flow hole and the second air flow hole, and the positive and negative pressure exchange cavity is communicated with the positive pressure cavity through the relief hole.

[0014] Preferably, the inner side of the diaphragm fixing seat is provided with a through groove adapted to the positive and negative pressure exchange cavity.

[0015] More preferably, the diaphragm is fixedly connected with the motor assembly through the diaphragm support, and the upper end of the diaphragm support is movably inserted into the through groove and is fixedly connected with the diaphragm.

[0016] More preferably, the motor assembly comprises a motor and a base, a through hole adapted to the rotating shaft of the motor is arranged in the center of the base, the upper end of the rotating shaft of the motor penetrates through the through hole, and the motor is fixedly connected with the base through a base fixing screw.

[0017] More preferably, the motor assembly further comprises a driven wheel, the rotating shaft of the motor is fixedly connected with the diaphragm support through the driven wheel and a central shaft of the diaphragm support, the diaphragm support rotates in a centrifugal manner under the driving of the motor and the driven wheel and drives the diaphragm to reciprocatingly move up and down, and a sealing ring is arranged between the driven wheel and the rotating shaft of the motor.

[0018] The beneficial effects of the utility model are as follows:

[0019] This invention enables convenient positive and negative pressure adjustment, allowing for flexible changes in pressure state according to working conditions, significantly improving equipment adaptability, eliminating the need for multiple pumps, and reducing equipment cost and system complexity. Attached Figure Description

[0020] Figure 1 This is an exploded view of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of section A;

[0022] Figure 3 This is an internal structural diagram of the upper cover body of this utility model;

[0023] Figure 4 This is a structural schematic diagram of the upper cover fixing base of this utility model;

[0024] Figure 5 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 6 This is a diagram of the internal exhaust path of this utility model;

[0026] Figure 7 yes Figure 6 Enlarged view of section B;

[0027] Figure 8 yes Figure 6 Enlarged view of section C;

[0028] Figure 9 This is the air intake path diagram of this utility model;

[0029] Figure 10 This is a diagram of the intake and exhaust conversion path of this utility model.

[0030] Figure label:

[0031] 1. Vacuum pump fixing screw; 2. Top cover body; 3. Pressure adjusting screw; 4. One-way valve; 5. Top cover fixing seat; 6. Diaphragm; 7. Diaphragm fixing seat; 8. Diaphragm support; 9. Driven wheel; 10. Base fixing screw; 11. Base; 12. Sealing ring; 13. Motor; 14. Pressure relief hole; 15. First airflow hole; 16. Positive and negative pressure exchange chamber; 17. Second airflow hole; 18. Through groove; 19. Closed chamber; 20. Negative pressure chamber; 21. Positive pressure chamber; 22. Exhaust hole; 23. Positive pressure relief hole; 24. Air inlet; 25. Negative pressure relief hole; 26. Negative pressure pipe; 27. Ultrasonic welding wire A; 28. Ultrasonic welding wire B; 29. ​​Positive pressure pipe. Detailed Implementation

[0032] In the description of this utility model, it should be noted that the terms "upper / lower", "front / rear", "inner / outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within the components of a compatible model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, unless otherwise specified, all components used in this application are commercially available components, and the connection between different components can be achieved through conventional technical means.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] A positive and negative pressure vacuum pump, such as Figures 1-3 As shown, it includes:

[0036] The upper cover body 2 has a positive pressure chamber 21 on its inner side and a negative pressure chamber 20 on its outer side. The negative pressure chamber 20 is connected to the air through an air inlet 24 and a negative pressure relief hole 25, and the positive pressure chamber 21 is connected to the air through a positive pressure relief hole 23 and an exhaust hole 22.

[0037] It is understandable that, such as Figure 3 As shown, the positive pressure chamber 21 is located inside the upper cover body 2, and the negative pressure chamber 20 is arranged around the positive pressure chamber 21. An ultrasonic welding line B 28 is arranged around the negative pressure chamber 20 on the side wall of the upper cover body 2, and an ultrasonic welding line A 27 is arranged around the positive pressure chamber 21. The upper cover body 2 and the upper cover fixing seat 5 are welded together by ultrasonic welding process, and the two cooperate with each other to form an independent and sealed positive pressure chamber 21 and negative pressure chamber 20.

[0038] The diaphragm 6 and the motor assembly are fixedly connected, and the diaphragm 6 is movably fitted to the diaphragm fixing seat 7. The diaphragm fixing seat 7 is fixedly connected to the upper cover body 2. The diaphragm 6 moves up and down under the drive of the motor assembly. A positive and negative pressure exchange chamber 16 is provided on the inner side of the diaphragm 6, and a closed chamber 19 is provided on the outer side of the diaphragm fixing seat 7. During the diaphragm's lifting and lowering process, the negative pressure chamber 20 is connected to the positive pressure chamber 21 through the positive and negative pressure exchange chamber 16 and the closed chamber 19. That is, the four chambers, namely the negative pressure chamber 20, the closed chamber 19, the positive and negative pressure exchange chamber 16, and the positive pressure chamber 21, are connected in sequence. When the diaphragm 6 completes the lifting action (the diaphragm 6 and the upper cover fixing seat 5 are in contact), the negative pressure chamber 20 and the closed chamber 19 are connected, the positive and negative pressure exchange chamber 16 and the positive pressure chamber 21 are connected, and the positive pressure chamber 21 and the negative pressure chamber 20 are not connected.

[0039] It is understandable that during the lifting and lowering of the diaphragm 6, the diaphragm 6 and the upper cover fixing seat 5 do not contact each other. At this time, the negative pressure chamber 20 is connected to the positive and negative pressure exchange chamber 16 through the first airflow hole 15. The gas in the negative pressure chamber 20 can enter the positive and negative pressure exchange chamber 16 through the first airflow hole 15. When the diaphragm 6 rises continuously, the gas in the positive and negative pressure exchange chamber 16 will be squeezed and reach the positive pressure chamber 21 through the pressure relief hole 14, and finally be discharged.

[0040] like Figure 1 As shown, the upper cover body 2, the upper cover fixing seat 5, the diaphragm fixing seat 7 and the base 11 are fixed together by the vacuum pump fixing screw 1.

[0041] As a preferred option, such as Figure 5 As shown, the positive pressure relief hole 23 and the exhaust hole 22 are respectively located on the upper and lower sides of the positive pressure pipe 29. A one-way valve 4 is provided at the connection between the exhaust hole 22 and the positive pressure pipe 29, so that the exhaust hole 22 is only used for gas discharge. The negative pressure relief hole 25 is located on the upper side of the negative pressure pipe 26. The positive pressure relief hole 23, the air inlet 24, the exhaust hole 22 and the negative pressure relief hole 25 are all connected to the air.

[0042] As a preferred option, such as Figure 1 , Figure 6 and Figure 9 As shown, both the positive pressure pipe 29 and the negative pressure pipe 26 are equipped with matching pressure adjusting screws 3. The pressure adjusting screws 3 are used to adjust the cross-sectional area of ​​the gas flow of the positive pressure relief hole 23 and the negative pressure relief hole 25.

[0043] Preferably, the system also includes a top cover fixing seat 5. The inner and outer sides of the top cover fixing seat 5 are evenly provided with pressure relief holes 14 and first airflow holes 15, respectively. The top cover fixing seat 5 is also equipped with a one-way valve 4 adapted to the pressure relief holes 14. The one-way valve 4 is used to control the unidirectional flow of airflow. The specific installation method and working principle of the one-way valve 4 are as follows: Figures 6-8 As shown.

[0044] like Figure 2As shown, as a more preferred embodiment, a second airflow hole 17 is provided on the outer side of the diaphragm 6.

[0045] More preferably, during the lifting and lowering of the diaphragm 6 (when the diaphragm 6 does not contact the upper cover fixing seat 5), the negative pressure chamber 20 is connected to the positive and negative pressure exchange chamber 16 through the first airflow hole 15 and the positive and negative pressure exchange chamber 16 through the first airflow hole 15 and the second airflow hole 17, the positive and negative pressure exchange chamber 16 is connected to the positive pressure chamber 21 through the pressure relief hole 14, and the closed chamber 19 is connected to the positive pressure chamber 21 through the second airflow hole 17 and the pressure relief hole 14; when the diaphragm 6 completes the lifting action and fits with the upper cover fixing seat 5, the negative pressure chamber 20 is connected to the closed chamber 19 through the first airflow hole 15 and the second airflow hole 17, and the positive and negative pressure exchange chamber 16 is connected to the positive pressure chamber 21 through the pressure relief hole 14.

[0046] As a better option, the inner side of the diaphragm fixing seat 7 is provided with a through groove 18 that is adapted to the positive and negative pressure exchange chamber 16.

[0047] As a better alternative, the diaphragm 6 is fixedly connected to the motor assembly via the diaphragm support 8, and the upper end of the diaphragm support 8 is movably inserted into the through groove 18 of the diaphragm fixing seat 7 and fixedly connected to the diaphragm 6 (i.e., the bottom surface of the positive and negative pressure exchange chamber 16).

[0048] More preferably, the motor assembly includes a motor 13 and a base 11. The base 11 has a through hole in the center that is adapted to the rotating shaft of the motor 13. The upper end of the rotating shaft of the motor 13 passes through the through hole. The motor 13 is fixedly connected to the base 11 by a base fixing screw 10.

[0049] As a preferred embodiment, the motor assembly further includes a driven wheel 9. The shaft of the motor 13 is fixedly connected to the central shaft of the diaphragm support 8 via the driven wheel 9. The diaphragm support 8 rotates centrifugally under the drive of the motor 13 and the driven wheel 9, and drives the diaphragm 6 to perform a lifting and reciprocating motion (i.e., the diaphragm support 8 and the diaphragm 6 are fixedly connected, and under the drive of the motor 13, they can move up and down in the through groove 18 of the diaphragm fixing seat 7). A sealing ring 12 is installed between the driven wheel 9 and the shaft of the motor 13.

[0050] The operation process of this utility model is as follows:

[0051] After the entire vacuum pump is installed, start the vacuum pump. Motor 13 rotates, and driven wheel 9 rotates under the drive of the motor 13's shaft, further driving the diaphragm support 8 to rotate centrifugally. The diaphragm support 8 further drives the diaphragm 6 to perform a lifting and lowering reciprocating motion. When the diaphragm 6 descends, as... Figure 9 As shown, gas enters through the inlet 24 and the negative pressure relief vent 25, passes through the first airflow vent 15, and enters the positive and negative pressure exchange chamber 16; then, accompanied by the rise of the diaphragm 6, as... Figure 6 and Figure 10As shown, the gas in the positive and negative pressure exchange chamber 16 is compressed and enters the positive pressure chamber 21 through the pressure relief hole 14, and is finally discharged from the exhaust hole 22 and the positive pressure relief hole 23. When the diaphragm 6 rises continuously and finally comes into contact with the bottom surface of the upper cover fixing seat 5, the first airflow hole 15 and the second airflow hole 17 are connected, and the negative pressure chamber 20 is connected to the closed chamber 19 through the two airflow holes, so that the positive pressure chamber 21 and the negative pressure chamber 20 are no longer connected, thereby ensuring that the airflow will not enter the positive and negative pressure exchange chamber 16.

[0052] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A positive and negative pressure vacuum pump, characterized in that, include: The upper cover body has a positive pressure chamber on its inner side and a negative pressure chamber on its outer side. The negative pressure chamber is connected to the air through an air inlet and a negative pressure relief hole, and the positive pressure chamber is connected to the air through a positive pressure relief hole and an exhaust hole. The diaphragm and motor assembly are fixedly connected, with the diaphragm movably fitted to a diaphragm fixing seat. The diaphragm fixing seat is fixedly connected to the upper cover body. The diaphragm moves up and down under the drive of the motor assembly. A positive and negative pressure exchange chamber is provided on the inner side of the diaphragm, and a closed chamber is provided on the outer side of the diaphragm fixing seat. During the diaphragm's rising and falling process, the negative pressure chamber is connected to the positive pressure chamber through the positive and negative pressure exchange chamber and the closed chamber. When the diaphragm completes its rising action, the negative pressure chamber and the closed chamber are connected, and the positive and negative pressure exchange chamber and the positive pressure chamber are connected.

2. The positive and negative pressure vacuum pump as described in claim 1, characterized in that, The positive pressure relief hole and the exhaust hole are respectively located on the upper and lower sides of the positive pressure pipe. A one-way valve is provided at the connection between the exhaust hole and the positive pressure pipe. The negative pressure relief hole is located on the upper side of the negative pressure pipe.

3. A positive and negative pressure vacuum pump as described in claim 2, characterized in that, Both the positive pressure pipe and the negative pressure pipe are equipped with matching pressure adjusting screws, which are used to adjust the cross-sectional area of ​​the gas flow rate of the positive pressure relief hole and the negative pressure relief hole.

4. A positive and negative pressure vacuum pump as described in claim 1, characterized in that, It also includes a top cover fixing seat, on which pressure relief holes and a first airflow hole are evenly arranged on the inner and outer sides respectively, and a one-way valve adapted to the pressure relief hole is provided on the top cover fixing seat, the one-way valve being used to restrict the unidirectional flow of airflow.

5. A positive and negative pressure vacuum pump as described in claim 4, characterized in that, A second airflow hole is provided on the outer side of the diaphragm at the position corresponding to the first airflow hole.

6. A positive and negative pressure vacuum pump as described in claim 5, characterized in that, During the diaphragm lifting and lowering process, the negative pressure chamber is connected to the positive and negative pressure exchange chamber through the first airflow hole and the positive and negative pressure exchange chamber through the first airflow hole and the second airflow hole. The positive and negative pressure exchange chamber is connected to the positive pressure chamber through the pressure relief hole, and the closed chamber is connected to the positive pressure chamber through the second airflow hole and the pressure relief hole. When the diaphragm completes the lifting action and is attached to the upper cover fixing seat, the negative pressure chamber is connected to the closed chamber through the first airflow hole and the second airflow hole, and the positive and negative pressure exchange chamber is connected to the positive pressure chamber through the pressure relief hole.

7. A positive and negative pressure vacuum pump as described in claim 1, characterized in that, The inner side of the diaphragm fixing seat is provided with a through groove that is adapted to the positive and negative pressure exchange chamber.

8. A positive and negative pressure vacuum pump as described in claim 7, characterized in that, The diaphragm is fixedly connected to the diaphragm support and the motor assembly. The upper end of the diaphragm support is movably inserted into the through groove and fixedly connected to the diaphragm.

9. A positive and negative pressure vacuum pump as described in claim 8, characterized in that, The motor assembly includes a motor and a base. The base has a through hole in the center that is adapted to the motor shaft. The upper end of the motor shaft passes through the through hole. The motor is fixedly connected to the base by base fixing screws.

10. A positive and negative pressure vacuum pump as described in claim 9, characterized in that, The motor assembly also includes a driven wheel. The motor shaft is fixedly connected to the central shaft of the diaphragm support through the driven wheel. The diaphragm support rotates centrifugally under the drive of the motor and the driven wheel, and drives the diaphragm to perform a lifting and reciprocating motion. A sealing ring is installed between the driven wheel and the motor shaft.

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