Diaphragm pump head with buffer device

Abstract

The diaphragm pump head with the buffering device comprises a pump head body, a liquid cavity is formed in the pump head body, a middle valve element is arranged in the liquid cavity, a thrust diaphragm is arranged on the left side of the liquid cavity, an inlet one-way valve set and an outlet one-way valve set are arranged at the upper end and the lower end of the pump head body respectively, and a buffering diaphragm is arranged on the right side of the liquid cavity. A compressed gas cavity is arranged between the buffer diaphragm and the cover plate, and a buffer liquid cavity is arranged in the liquid cavity. The buffer device is arranged, when the pressure of the liquid cavity is larger than the pressure of the outlet, one part of liquid enters the buffer liquid cavity, the other part of liquid upwards pushes the outlet one-way valve ball through the outlet one-way valve set to be discharged, and the part of liquid entering the buffer liquid cavity is subjected to gas thrust of the compressed gas cavity within the time period when the thrust diaphragm is pulled leftwards by external force; the continuous liquid discharging device has the advantages that the structure is simple, the occupied space is small, the cost is low, and the continuous liquid discharging effect is remarkable.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm pumps, and in particular relates to a diaphragm pump head with a buffer device. Background Art

[0002] The diaphragm pump is a special type of positive displacement pump. It relies on the back and forth agitation of a diaphragm to change the volume of the working chamber to inhale and discharge liquid. During the process of inhalation and discharge, the liquid discharge is discontinuous. In some diaphragm pump applications, liquid needs to be added continuously and uninterruptedly. In the prior art, in order to solve the problem of discontinuous liquid discharge, most of them are solved by adding an external damper. However, the problems with the external damper are: first, the pipeline is complicated and occupies a large space; second, the cost is high. The damper needs to be purchased separately and adapted to the diaphragm pump. Often, the size of the adapted damper is not suitable for the diaphragm pump, resulting in the continuous liquid discharge effect is not obvious. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a diaphragm pump head with a buffer device.

[0004] The technical solution of the present invention is implemented as follows: a diaphragm pump head with a buffer device comprises a pump head, a liquid cavity is arranged in the pump head, a middle valve core is arranged in the liquid cavity, a middle ball valve is arranged in the middle valve core, the middle valve core is fixed between a left fixed body and a right fixed body, a thrust diaphragm is arranged on the left side of the liquid cavity, the thrust diaphragm is fixedly connected to the pump head body through a diaphragm pressure plate, an inlet check valve group and an outlet check valve group are respectively arranged at the upper and lower ends of the pump head, the inlet check valve group and the outlet check valve group A valve ball is provided inside each of the two valves, the cavity between the inlet one-way valve group and the middle valve core is the liquid inlet cavity, the cavity between the outlet one-way valve group and the middle valve core is the liquid outlet cavity, a buffer diaphragm is provided on the right side of the liquid cavity, a cover plate is provided on the outside of the buffer diaphragm, a compressed gas cavity is provided between the buffer diaphragm and the cover plate, a buffer cavity is provided in the liquid cavity, the buffer cavity is located between the right side fixed body and the buffer diaphragm, the buffer cavity is communicated with the liquid outlet cavity through the buffer diaphragm, and a buffer channel is provided between the upper end of the buffer cavity and the liquid outlet cavity.

[0005] The beneficial effects of the present invention are as follows: the present invention is provided with a buffer device, when the liquid chamber pressure is greater than the outlet pressure, part of the liquid enters the buffer chamber, and part of the liquid is discharged by pushing up the outlet one-way valve ball through the outlet one-way valve group, and part of the liquid that enters the buffer chamber is subjected to the gas thrust of the compressed gas chamber during the time period when the thrust diaphragm is pulled to the left by an external force, and the liquid in the buffer chamber will be discharged again, so that the discharged liquid flows continuously, thereby solving the problem of discontinuous liquid discharge in the existing diaphragm pump, and the present invention has a simple structure, occupies a small space, is low in cost, and has a significant continuous liquid discharge effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a schematic diagram of the thrust diaphragm of the present invention pushing the liquid in the liquid cavity to the right to discharge; Figure 4 It is a schematic diagram of liquid discharge in the buffer chamber of the present invention.

[0007] Parts Description: 1. Pump head, 2. Liquid chamber, 3. Thrust diaphragm, 4. Diaphragm pressure plate, 5. Cover plate, 6. Buffer diaphragm, 7. Compressed gas chamber, 8. Buffer chamber, 9. Middle valve core, 10. Middle valve ball, 11. Outlet check valve group, 12. Outlet check valve ball, 13. Inlet check valve group, 14. Inlet check valve ball, 15. Liquid inlet chamber, 16. Liquid outlet chamber, 17. Left fixed body, 18. Right fixed body, 19. Buffer channel. DETAILED DESCRIPTION

[0008] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0009] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 cannot be understood as a limitation on the present invention.

[0010] See attached Figure 1-4A diaphragm pump head with a buffer device, comprising a pump head 1, wherein the pump head 1 is provided with a liquid cavity 2, wherein the liquid cavity 2 is provided with a middle valve core 9, wherein the middle valve core 9 is provided with a middle ball valve 10, wherein the middle valve core 9 is fixed between a left fixed body 17 and a right fixed body 18, wherein a thrust diaphragm 3 is provided on the left side of the liquid cavity 2, wherein the thrust diaphragm 3 is fixedly connected to the pump head body through a diaphragm pressure plate 4, wherein the upper and lower ends of the pump head 1 are respectively provided with an inlet check valve group 13 and an outlet check valve group 11, wherein the inlet check valve group 13 and the outlet check valve group 11 are both provided with valve balls, wherein the inlet check valve group 13 and the outlet check valve group 11 are ... The cavity between the inlet one-way valve group 13 and the middle valve core 9 is the liquid inlet cavity 15, the cavity between the outlet one-way valve group 11 and the middle valve core 9 is the liquid outlet cavity 16, a buffer diaphragm 6 is provided on the right side of the liquid cavity 2, a cover plate 5 is provided on the outside of the buffer diaphragm 6, a compressed gas cavity 7 is provided between the buffer diaphragm 6 and the cover plate 5, a buffer cavity 8 is provided in the liquid cavity 2, the buffer cavity 8 is located between the right side fixed body 18 and the buffer diaphragm 6, the buffer cavity 8 is communicated with the liquid outlet cavity 16 through the buffer diaphragm 6, and a buffer channel 19 is provided between the upper end of the buffer cavity 8 and the liquid outlet cavity 16.

[0011] Specifically, when the thrust diaphragm 3 is pulled to the left by an external force, the pressure in the liquid chamber is less than the external atmospheric pressure, and the liquid passes through the inlet one-way valve group 13, pushing the inlet one-way valve ball 14 upward, and the liquid enters the liquid inlet chamber 15. When the thrust diaphragm 3 is pushed to the right by an external force, the liquid chamber pressure is greater than the outlet pressure, and the liquid entering the liquid inlet chamber 15 enters the liquid outlet chamber 16 from the liquid inlet chamber 15 through the middle valve core 9 and the middle valve ball 10. A portion of the liquid in the liquid outlet chamber 16 pushes the outlet one-way valve ball 12 upward to be discharged, and a portion of the liquid pushes the buffer diaphragm 6 from the liquid outlet chamber 16 to enter the buffer chamber 8 through the buffer channel 19. The liquid entering the buffer chamber 8, during the time period when the thrust diaphragm 3 is pulled to the left by an external force, the buffer diaphragm 6, under the action of the compressed gas in the compressed gas chamber 7, pushes the liquid in the buffer chamber 8 into the liquid outlet chamber 16 through the buffer channel 19, and pushes the outlet one-way valve ball 12 upward to be discharged, and this cycle is repeated so that the discharged liquid flows continuously.

[0012] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A diaphragm pump head with a buffer device, comprising a pump head (1), wherein the pump head (1) is provided with a liquid cavity (2), wherein the liquid cavity (2) is provided with a middle valve core (9), wherein the middle valve core (9) is provided with a middle ball valve (10), wherein the middle valve core (9) is fixed between a left fixed body (17) and a right fixed body (18), wherein a thrust diaphragm (3) is provided on the left side of the liquid cavity (2), wherein the thrust diaphragm (3) is fixedly connected to the pump head body via a diaphragm pressure plate (4), wherein an inlet check valve group (13) and an outlet check valve group (11) are provided at the upper and lower ends of the pump head (1), wherein valve balls are provided in the inlet check valve group (13) and the outlet check valve group (11), wherein the cavity between the inlet check valve group (13) and the middle valve core (9) is a liquid inlet cavity (15), and the cavity between the outlet check valve group (11) and the middle valve core (9) is a liquid outlet cavity (16), wherein the pump head (1) is provided with a valve ball; wherein the valve ball is provided in the inlet check valve group (13) and the middle valve core (9), wherein ... A buffer membrane (6) is provided on the right side of the liquid chamber (2), a cover plate (5) is provided on the outside of the buffer membrane (6), a compressed gas chamber (7) is provided between the buffer membrane (6) and the cover plate (5), a buffer chamber (8) is provided in the liquid chamber (2), the buffer chamber (8) is located between the right side fixed body (18) and the buffer membrane (6), the buffer chamber (8) is communicated with the liquid outlet chamber (16) through the buffer membrane (6), and a buffer passage (19) is provided between the upper end of the buffer chamber (8) and the liquid outlet chamber (16).

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