Low pulsation air bag pump

Abstract

The application discloses a low-pulsation air bag pump and belongs to the technical field of pump body equipment. The air bag pump comprises a pump head, an inlet and an outlet are arranged on the pump head, a first air cylinder and a second air cylinder are symmetrically arranged on the two sides of the pump head, a first bellows is arranged between the pump head and the first air cylinder, a second bellows is arranged between the pump head and the second air cylinder, a first positive check valve and a first negative check valve are arranged in the first bellows, a second positive check valve and a second negative check valve are arranged in the second bellows, the first positive check valve and the second positive check valve are matched with the outlet, and the first negative check valve and the second negative check valve are matched with the inlet. The inlet and the outlet are both three-way structures, a liquid inlet pipe is connected to the inlet, a liquid outlet pipe is connected to the outlet, and a buffer assembly is arranged at the end of the liquid outlet pipe close to the outlet. The liquid conveying process is more stable, the flow distance of the discharged liquid is prolonged, the liquid can be continuously and stably output from the pump body, and the pulsation is effectively reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a low-pulsation air bag pump and belongs to the technical field of pump bodies. BACKGROUND

[0002] The air bag pump is a pump for realizing liquid delivery by using compressed air to drive the expansion and contraction of an air bag, which mainly comprises an air bag, a cavity, inlet and outlet one-way valves and components connected with a compressed air source. During operation, compressed air enters the cavity to make the air bag expand, at this time, the pressure in the pump cavity is reduced, and liquid is sucked in through the inlet one-way valve; when the compressed air is discharged, the air bag contracts, the pressure in the pump cavity is increased, and liquid is discharged through the outlet one-way valve under pressure, and the air bag pump is widely applied in chemical industry, pharmaceutical industry, food processing and other industries.

[0003] The two air bags of the air bag pump work alternately, and liquid can be continuously discharged. Due to the principle of the air bag pump, the flow and pressure of the liquid discharged by the air bag show certain pulsation characteristics. In order to solve the pulsation caused by the pressure change when the valve is switched, the common method is to reduce the flow and absorb the pulsation by installing a damper, but the former reduces the output flow of the pump, and the latter increases the overall volume and cost of the device. Therefore, the application is proposed. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above problems, the application provides a low-pulsation air bag pump, which improves the structure of the air bag pump to make the liquid delivery process more stable, wherein the flow distance of the discharged liquid is prolonged to ensure that the liquid can be continuously and stably output from the pump body, thereby effectively reducing the pulsation.

[0005] The utility model adopts the following technical scheme:

[0006] A low-pulsation air bag pump comprises a pump head, an inlet and an outlet are arranged on the pump head, first and second air cylinders are symmetrically arranged on the two sides of the pump head, a first bellows is arranged between the pump head and the first air cylinder, a second bellows is arranged between the pump head and the second air cylinder, a first positive one-way valve and a first negative one-way valve are arranged in the first bellows, a second positive one-way valve and a second negative one-way valve are arranged in the second bellows, the first and second positive one-way valves are matched with the outlet, and the first and second negative one-way valves are matched with the inlet.

[0007] The inlet and the outlet are both three-way structures, an inlet pipe is connected to the inlet, an outlet pipe is connected to the outlet, and a buffer assembly is arranged at the end of the outlet pipe close to the outlet.

[0008] Optionally, the buffer assembly comprises a flow pipe, a spiral blade, a first hole plate and a second hole plate, the spiral blade is arranged on the flow pipe, and the first hole plate and the second hole plate are arranged at two ends of the flow pipe respectively.

[0009] Optionally, the first hole plate and the second hole plate are both provided with a first hole channel and a second hole channel, the second hole channel is arranged around the first hole channel, and the flow pipe is in communication with the first hole channel.

[0010] Optionally, an included angle between a central axis of the second hole channel and the flow pipe is 30-60°.

[0011] Optionally, the first hole plate is arranged at one end close to the liquid outlet, and the first hole plate is provided with a first sealing ring at an outer periphery thereof.

[0012] Optionally, the liquid outlet pipe is provided with a first clamping groove inside, the first clamping groove is provided with a second sealing ring, the first sealing ring is clamped in the first clamping groove and abuts against the second sealing ring.

[0013] Optionally, the second hole plate is provided with an elastic clamping piece at an outer periphery thereof, and the liquid outlet pipe is further provided with a second clamping groove inside, and the elastic clamping piece is clamped and matched with the second clamping groove.

[0014] Optionally, the elastic clamping piece comprises a clamping block and a spring, the second hole plate is provided with a containing groove at an outer periphery thereof, one end of the spring is connected in the containing groove, the other end is connected with the clamping block, and the clamping block is clamped in the second clamping groove.

[0015] Optionally, the clamping block is provided with an L-shaped groove at a side away from the liquid outlet.

[0016] Optionally, one end of the first clamping groove away from the liquid outlet and one end of the second clamping groove away from the liquid outlet are both connected with the liquid outlet pipe through a circular arc surface.

[0017] The application can produce beneficial effects including but not limited to:

[0018] The low-pulsation air bag pump provided by the application utilizes the reciprocating motion of bellows driven by two cylinders to keep constant pressure and flow, which is beneficial to reduce pulsation; by setting a buffer assembly in the liquid outlet pipe, the flow characteristics of the fluid are optimized, a part of the fluid directly flows out through the flow-through pipe, and another part of the fluid flows out through the first orifice plate, the spiral blade and the second orifice plate in turn, the flow of the two liquid discharge modes is complementary, and the low-pulsation fluid discharge is realized; by setting the first sealing ring and the second sealing ring, double sealing protection is formed, so that the liquid can flow out from the specific path of the buffer assembly, and the connection stability between the buffer assembly and the liquid outlet pipe is enhanced; by the clamping cooperation of the elastic clamping piece and the second clamping groove, the connection between the buffer assembly and the liquid outlet pipe is firm and reliable, and the liquid can be prevented from flowing out through the connection; by improving the structure of the air bag pump, the pulsation and impact of the liquid are reduced, and the continuous and smooth flow of the liquid is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the application, constitute a part of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application. In the drawings:

[0020] Figure 1 It is a front view of the low-pulsation air bag pump related to the embodiments of the application;

[0021] Figure 2 It is a side view of the low-pulsation air bag pump related to the embodiments of the application;

[0022] Figure 3 It is a front view of the buffer assembly related to the embodiments of the application;

[0023] Figure 4 It is a bottom view of the second orifice plate related to the embodiments of the application;

[0024] List of components and reference numerals:

[0025] 1, pump head, 2, liquid inlet, 3, liquid outlet, 4, first cylinder, 5, second cylinder, 6, first bellows, 7, second bellows, 8, first positive check valve, 9, first negative check valve, 10, second positive check valve, 11, second negative check valve, 12, liquid inlet pipe, 13, liquid outlet pipe, 14, buffer assembly, 15, flow-through pipe, 16, spiral blade, 17, first orifice plate, 18, second orifice plate, 19, first hole, 20, second hole, 21, first sealing ring, 22, first clamping groove, 23, second sealing ring, 24, second clamping groove, 25, elastic clamping piece, 26, clamping block, 27, spring, 28, containing groove, 29, L-shaped groove. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the overall technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] In order to more clearly illustrate the overall technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways different from those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0029] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In this application, unless otherwise clearly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0033] Referring to Figures 1-4 , the low-pulsation air bag pump according to the present application is introduced.

[0034] The low-pulsation air bag pump according to the present embodiment includes a pump head 1, an inlet 2 and an outlet 3 are arranged on the pump head 1 for the entry and outflow of liquid; a first cylinder 4 and a second cylinder 5 are symmetrically arranged on both sides of the pump head 1, so that the air bag pump can smoothly suck in and discharge liquid when working; a first bellows 6 is arranged between the pump head 1 and the first cylinder 4, and a second bellows 7 is arranged between the pump head 1 and the second cylinder 5, the reciprocating motion of the bellows driven by the two cylinders can maintain constant pressure and flow, which is beneficial to reduce pulsation; a first positive check valve 8 and a first negative check valve 9 are arranged in the first bellows 6, and a second positive check valve 10 and a second negative check valve 11 are arranged in the second bellows 7, the first positive check valve 8 and the second positive check valve 10 are matched with the outlet 3, for pressing the liquid in the two bellows out of the outlet 3, the first negative check valve 9 and the second negative check valve 11 are matched with the inlet 2, for sucking the liquid of the inlet 2 into the two bellows;

[0035] The inlet 2 and the outlet 3 are both three-way structures, an inlet pipe 12 is connected to the inlet 2, and an outlet pipe 13 is connected to the outlet 3, for sucking in and discharging liquid from the air bag pump; a buffer assembly 14 is arranged at the end of the outlet pipe 13 close to the outlet 3, to further reduce the pulsation and impact of the liquid, making the conveying process more stable.

[0036] As an embodiment, the buffer assembly 14 includes a flow pipe 15, a spiral blade 16, a first hole plate 17 and a second hole plate 18, the spiral blade 16 is arranged on the flow pipe 15, and the first hole plate 17 and the second hole plate 18 are arranged at both ends of the flow pipe 15 respectively; when discharging liquid, a part of the fluid directly flows out through the flow pipe 15, and another part of the fluid flows out through the first hole plate 17, the spiral blade 16 and the second hole plate 18 in turn, the flow of the two discharging methods is complementary, realizing the low-pulsation outflow of the fluid.

[0037] In the utility model, the pitch of the helical blade 16 is 1 / 4-3 / 4 of its outer diameter, preferably 1 / 2; ensure that the fluid is more stable in the flowing process, reduce the vortex and turbulence phenomenon, thereby reduce the energy loss and pressure fluctuation.

[0038] As an implementation form, the first hole plate 17 and the second hole plate 18 are provided with the first hole channel 19 and the second hole channel 20, the second hole channel 20 is arranged around the first hole channel 19, and the flow pipe 15 is connected with the first hole channel 19; by optimizing the flow characteristics of the fluid, more fine flow control is realized, which is helpful to maintain the stability of the pumping system.

[0039] As an implementation form, the angle between the central axis of the second hole channel 20 and the flow pipe 15 is 30-60 °, preferably 45 °; when the fluid passes through the second hole channel 20 of the first hole plate 17, the fluid can be guided to flow more along the helical blade 16, and the flowing process is easy to control; when the fluid passes through the second hole channel 20 of the second hole plate 18, the fluid can be gathered in the flow pipe 15, and the liquid can be continuously and smoothly discharged.

[0040] As an implementation form, the first hole plate 17 is located at one end close to the liquid outlet 3, and the outer periphery of the first hole plate 17 is provided with the first sealing ring 21, so that the liquid can flow out of the buffer assembly 14 along a specific path, which is helpful to control the outlet pressure and reduce the interference of external factors.

[0041] As an implementation form, the first clamping groove 22 is arranged in the inside of the liquid outlet pipe 13, the second sealing ring 23 is arranged in the first clamping groove 22, the first sealing ring 21 is clamped in the first clamping groove 22 and abuts against the second sealing ring 23; not only double sealing guarantee is formed, but also the connection stability between the buffer assembly 14 and the liquid outlet pipe 13 can be enhanced.

[0042] In the utility model, the material of the first sealing ring 21 and the second sealing ring 23 can be rubber, polyurethane, silica gel resin and the like, and the material of the two sealing rings is not limited in the embodiment of the application, and can be selected according to actual needs.

[0043] As an implementation form, the outer periphery of the second hole plate 18 is provided with the elastic clamping piece 25, the inside of the liquid outlet pipe 13 is further provided with the second clamping groove 24, the elastic clamping piece 25 is clamped and matched with the second clamping groove 24, the buffer assembly 14 and the liquid outlet pipe 13 are assembled, and the connection between the buffer assembly 14 and the liquid outlet pipe 13 is firm and reliable.

[0044] As an implementation form, the elastic clamping piece 25 comprises a clamping block 26 and a spring 27, the outer periphery of the second hole plate 18 is provided with a receiving groove 28, one end of the spring 27 is connected in the receiving groove 28, the other end is connected with the clamping block 26, and the clamping block 26 is clamped in the second clamping groove 24; it is convenient to disassemble and assemble, the elastic force of the spring 27 makes the contact between the clamping block 26 and the second clamping groove 24 more closely, and liquid flowing out through the place can be avoided.

[0045] As an implementation form, the clamping block 26 is provided with an L-shaped groove 29 away from the liquid outlet 3, a tool (such as a clamp, pliers, etc.) is inserted into the L-shaped groove 29, and the spring 27 is extruded along the center, so that the clamping block 26 is pulled out of the second clamping groove 24, so that the buffer assembly 14 can be pulled out of the liquid outlet pipe 13.

[0046] As an implementation form, the first clamping groove 22 away from the liquid outlet 3 and the second clamping groove 24 away from the liquid outlet 3 are both connected with the liquid outlet pipe 13 through a circular arc surface, which is convenient for the installation and removal of the buffer assembly 14, can reduce the damage to the liquid outlet pipe 13, and is beneficial to prolong the service life of the air bag pump.

[0047] In use, the first bellows 6 is elongated through the first cylinder 4, the first reverse check valve 9 is opened, the first positive check valve 8 is closed, liquid is sucked into the first bellows 6 from the liquid inlet 2 to compress the first bellows 6, the first reverse check valve 9 is closed, the first positive check valve 8 is opened, and the liquid in the first bellows 6 flows into the liquid outlet pipe 13 from the liquid outlet 3. The second bellows 7 is elongated through the second cylinder 5, the second reverse check valve 11 is opened, the second positive check valve 10 is closed, liquid is sucked into the second bellows 7 from the liquid inlet 2 to compress the second bellows 7, the second reverse check valve 11 is closed, the second positive check valve 10 is opened, and the liquid in the second bellows 7 flows into the liquid outlet pipe 13 from the liquid outlet 3. When the first bellows 6 is stretched, the second bellows 7 is compressed, so that the first bellows 6 absorbs water and the second bellows 7 discharges water; when the first bellows 6 is compressed, the second bellows 7 is stretched, so that the second bellows 7 absorbs water and the first bellows 6 discharges water. Thus, the liquid flows from the liquid inlet pipe 12 to the liquid outlet pipe 13.

[0048] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. Especially, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0049] The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A low-pulsation air bag pump characterized by, The pump head is provided with a liquid inlet and a liquid outlet, and first and second air cylinders are symmetrically arranged on both sides of the pump head, a first bellows is arranged between the pump head and the first air cylinder, a second bellows is arranged between the pump head and the second air cylinder, a first positive check valve and a first negative check valve are arranged in the first bellows, a second positive check valve and a second negative check valve are arranged in the second bellows, the first and second positive check valves are matched with the liquid outlet, and the first and second negative check valves are matched with the liquid inlet. The liquid inlet and the liquid outlet are both three-way structures, the liquid inlet is connected with a liquid inlet pipe, and the liquid outlet is connected with a liquid outlet pipe, and the liquid outlet pipe is provided with a buffer assembly at one end close to the liquid outlet. The buffer assembly comprises a flow pipe, a spiral blade, a first hole plate and a second hole plate, the spiral blade is arranged on the flow pipe, and the first and second hole plates are arranged at two ends of the flow pipe.

2. The low-pulsation wind-bag pump according to claim 1, characterized in that, First and second hole channels are arranged on the first and second hole plates, the second hole channel is arranged around the first hole channel, and the flow pipe and the first hole channel are in communication.

3. The low-pulsation windkessel pump according to claim 2, characterized in that The included angle between the central axis of the second hole channel and the flow pipe is 30-60°.

4. The low-pulsation windkessel pump according to claim 2, characterized in that The first hole plate is located at one end close to the liquid outlet, and the outer periphery of the first hole plate is provided with a first sealing ring.

5. The low-pulsation windkessel pump according to claim 4, characterized in that The inner side of the liquid outlet pipe is provided with a first clamping groove, the first clamping groove is provided with a second sealing ring, the first sealing ring is clamped in the first clamping groove and abuts against the second sealing ring.

6. The low-pulsation windkessel pump according to claim 2, characterized in that The outer periphery of the second hole plate is provided with an elastic clamping piece, and the inner side of the liquid outlet pipe is further provided with a second clamping groove, and the elastic clamping piece is clamped and matched with the second clamping groove.

7. The low-pulsation windkessel pump according to claim 6, characterized in that The elastic clamping piece comprises a clamping block and a spring, the outer periphery of the second hole plate is provided with a containing groove, one end of the spring is connected in the containing groove, the other end is connected with the clamping block, and the clamping block is clamped in the second clamping groove.

8. The low-pulsation windkessel pump according to claim 7, characterized in that The side of the clamping block away from the liquid outlet is provided with an L-shaped groove.

9. The low-pulsation windkessel pump according to claim 5, characterized in that The end of the first clamping groove away from the liquid outlet and the end of the second clamping groove away from the liquid outlet are both connected with the liquid outlet pipe through a circular arc surface.

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