A one-way valve for a pump

Abstract

The utility model discloses a one -way valve for pump belongs to diaphragm pump accessory technical field, and its technical scheme main points are: including valve body, support, piston and pre -tightening spare, the flow passage has in valve body, and the both ends of flow passage are inlet, outlet respectively, support is connected with valve body, and support has the through -hole of intercommunication export on, piston is arranged in the flow passage and is slid, pre -tightening spare is arranged in the support and is to piston with the pre -tightening force of pointing to the direction of inlet, make the piston seal inlet. This one -way valve is installed in the water inlet pipe or the water outlet pipe of diaphragm pump, and the turn -up edge is limited to valve body, and the flowing liquid pushes away piston from the direction of inlet, makes liquid flow from flow passage, outlet, if liquid reverse flow will be pressed tightly on the piston on the support, thereby prevents liquid reverse flow, that is, the liquid of entering or discharging diaphragm pump can only directional flow, thereby auxiliary diaphragm pump establishes stable pressure, guarantees the liquid delivery effect of diaphragm pump.

Description

Technical Field

[0001] This utility model belongs to the technical field of diaphragm pump accessories, and specifically relates to a one-way valve for pumps. Background Technology

[0002] Sprayers are a common piece of equipment in gardening and agricultural production.

[0003] For example, Chinese Patent CN203152347U discloses a backpack-type stainless steel electric sprayer, which includes a barrel, a water suction device, a spray gun, and a capping device. The barrel has a cavity, and the upper end of the barrel has an opening. The capping device seals with the opening. The water suction device includes a diaphragm pump, a connecting pipe, a storage battery, and a power switch. The bottom of the barrel has a cavity isolated from the main cavity. The connecting pipe is located in the cavity, and one end of its opening communicates with the main cavity. The spray gun is connected to the other end of the connecting pipe through the diaphragm pump. The barrel has a speed controller, which is electrically connected to the diaphragm pump. The speed controller can control the power of the diaphragm pump as needed, thus saving electricity.

[0004] When spraying is required, pressing the power switch activates the battery to power the diaphragm pump, which then pumps the liquid from the chamber through the connecting pipe and spray gun. This sprayer uses a diaphragm pump as its power source, and combined with the power switch and power supply, it achieves electric spraying functionality.

[0005] The aforementioned diaphragm pump uses a motor to drive the diaphragm to agitate back and forth, thereby conveying liquid from the tank to the spray gun and achieving continuous spraying. In electric agricultural machinery, diaphragm pumps are often used as a standard component for pumping liquids. Although diaphragm pumps have a certain self-priming capability to convey liquids, the liquid entering and exiting the diaphragm pump tends to flow back and forth, making it difficult for the liquid in the connecting pipe to maintain a consistent directional flow, thus reducing the diaphragm pump's self-priming capability. Furthermore, the sprayer shakes during use due to the user's movement, further exacerbating the forward or reverse flow of liquid in the connecting pipe, thereby further reducing the diaphragm pump's conveying efficiency. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a one-way valve for pumps. The technical problem to be solved by this invention is: how to effectively ensure the stable delivery of liquid by a diaphragm pump.

[0007] The above-mentioned technical objectives of this utility model can be achieved through the following technical solutions: A one-way valve for a pump includes a valve body, a bracket, a piston, and a pre-tightening element. The valve body has a flow channel with an inlet and an outlet at its two ends. The bracket is connected to the valve body and has a through hole communicating with the outlet. The piston is slidably disposed within the flow channel. The pre-tightening element is disposed within the bracket and applies a pre-tightening force to the piston in the direction of the inlet, thereby sealing the inlet.

[0008] In the aforementioned pump check valve, a support ring adapted to the piston is provided at the inlet.

[0009] In the aforementioned pump check valve, the piston has a guide rod that slides in conjunction with the support ring.

[0010] In the aforementioned pump check valve, the outer wall of the guide rod is provided with several weight-reducing grooves at intervals.

[0011] In the aforementioned pump check valve, the piston has a limiting groove at the end near the support ring, and the other end of the piston has an installation groove. The sidewall of the limiting groove has a guide surface, and the bottom of the limiting groove can abut against the end of the support ring.

[0012] In the aforementioned pump check valve, the preload element is a preload spring, with one end of the preload spring abutting against the mounting groove and the other end abutting against the bracket.

[0013] In the aforementioned pump check valve, the mounting groove has a positioning post, and the positioning post is located in the inner ring of the preload spring.

[0014] In the aforementioned pump check valve, a connecting groove is provided in the outlet, and a limiting ring is provided on the side wall of the connecting groove; the outer wall of the bracket has a flange, and after the flange is inserted into the connecting groove, the limiting ring limits the flange axially.

[0015] In the aforementioned pump check valve, the end of the bracket furthest from the valve body is the small-diameter end, the outer diameter of the small-diameter end is smaller than the outer diameter of the flange, and the inner wall of the small-diameter end can limit the piston.

[0016] In the aforementioned pump check valve, the valve body has a flange, which is located near the inlet or outlet side.

[0017] In summary, the beneficial effects of this utility model compared to the prior art are as follows: This one-way valve is installed inside the inlet or outlet pipe of the diaphragm pump. The flange limits the valve body, ensuring that the liquid entering or exiting the diaphragm pump flows in a specific direction, thus assisting the diaphragm pump in establishing stable pressure and ensuring its liquid delivery efficiency. The flowing liquid pushes the piston open from the inlet direction, allowing it to flow out through the flow channel and outlet. If the liquid flows in the opposite direction, it will press the piston against the support ring, preventing backflow. The guide rod guides the piston's sliding motion, and its guide surface cooperates with the support ring to ensure the piston accurately presses against the support ring, thereby sealing the inlet. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of an embodiment; Figure 2 This is an exploded view of the valve body and support in the embodiment; Figure 3 for Figure 1 A cross-sectional view; Figure 4 for Figure 3 A schematic diagram illustrating the changes; Figure 5 This is a schematic diagram of the piston structure in the embodiment; Figure 6 for Figure 5 A cross-sectional view; Figure 7 This is another structural schematic diagram of an embodiment.

[0019] Reference numerals: 100, valve body; 110, flow channel; 120, inlet; 121, support ring; 130, outlet; 131, connecting groove; 132, limit ring; 140, flange; 200, bracket; 210, through hole; 220, flange; 230, small diameter end; 231, water passage hole; 300, Piston; 310, Guide rod; 311, Weight reduction groove; 320, Limiting groove; 321, Guide surface; 330, Mounting groove; 331, Positioning pin; 400. Preload component; 410. Preload spring. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] A type of check valve for pumps, such as Figures 1-7As shown, the device includes a valve body 100, a bracket 200, a piston 300, and a pre-tightening member 400. The valve body 100 has a flow channel 110, with an inlet 120 and an outlet 130 at its two ends. The bracket 200 is connected to the valve body 100 and has a through hole 210 communicating with the outlet 130. The piston 300 is slidably disposed in the flow channel 110. The pre-tightening member 400 is disposed in the bracket 200 and applies a pre-tightening force to the piston 300 in the direction of the inlet 120, so that the piston 300 can seal the inlet 120.

[0022] A support ring 121 adapted to the piston 300 is provided at the inlet 120, and the support ring 121 extends into the flow channel 110. The piston 300 has a guide rod 310 that slides with the inner wall of the support ring 121.

[0023] like Figures 3-6 As shown, further, the outer wall of the guide rod 310 is provided with several weight-reducing grooves 311 at intervals, which allow water to flow into the inlet 120; in other words, the guide rod 310 can both guide the sliding of the piston 300 and increase the flow area of ​​the fluid.

[0024] The piston 300 has a limiting groove 320 at the end near the support ring 121. The side wall of the limiting groove 320 has a guide surface 321. When the piston 300 moves toward the support ring 121, the guide surface 321 assists in guiding the piston 300, so that the end of the support ring 121 can accurately enter the limiting groove 320. The end of the support ring 121 abuts against the bottom of the limiting groove 320, thereby sealing the inlet 120.

[0025] The piston 300 has a mounting groove 330 at the other end. The preload element 400 is a preload spring 410. One end of the preload spring 410 abuts against the mounting groove 330, and the other end abuts against the bracket 200. The mounting groove 330 has a positioning post 331, and the positioning post 331 is located in the inner ring of the preload spring 410, thereby preventing abnormal displacement of the end of the preload spring 410.

[0026] In some embodiments, the preload 400 consists of two magnetic blocks, one of which is located inside the bracket 200 and the other is located on the piston 300. The magnetic force between the two magnetic blocks is a magnetic repulsion force, thereby ensuring that the piston 300 can properly press against the support ring 121.

[0027] A connecting groove 131 is provided inside the outlet 130, and a limiting ring 132 is provided on the side wall of the connecting groove 131; the bracket 200 can be elastically deformed, and the outer wall of the bracket 200 has a flange 220. After the flange 220 is inserted into the connecting groove 131, the limiting ring 132 limits the flange 220 axially, thereby realizing the connection between the bracket 200 and the valve body 100, which is convenient for assembly.

[0028] The end of the bracket 200 furthest from the valve body 100 is a small-diameter end 230. This small-diameter end 230 contracts away from the valve body 100, making its outer diameter smaller than the outer diameter of the flange 220. When the piston 300 slides away from the support ring 121, the inner wall of the small-diameter end 230 can limit its movement. Specifically, the inner wall of the small-diameter end 230 cooperates with the support ring 121 to limit the sliding stroke of the piston 300, while the guide rod 310 remains within the support ring 121. The small-diameter end 230 has a water passage hole 231, which further improves the efficiency of fluid passing through the bracket 200.

[0029] like Figures 3-7 As shown, the valve body 100 has a flange 140 on its exterior, with the flange 140 located near the inlet 120 or outlet 130. By limiting the flange 140, the overall limiting of this check valve can be achieved. Specifically, as shown... Figure 3 As shown, if the flange 140 is near the outlet 130, then this type of check valve is installed at the inlet end of the diaphragm pump; Figure 7 As shown, if the flange 140 is near the inlet 120, then this type of check valve is installed at the outlet end of the diaphragm pump. In other words, a check valve is installed at the inlet and / or outlet end of the diaphragm pump to further improve the stability of the liquid delivered by the diaphragm pump.

[0030] The working principle of this utility model is as follows: Assuming this check valve is installed at the inlet of the diaphragm pump; under normal circumstances, the pressure on both sides of the piston 300 tends to be in equilibrium, and the preload spring 410 presses the piston 300 against the support ring 121, and the inlet 120 is in a sealed state.

[0031] When the diaphragm pump is working, it will transport the liquid from the inlet end to the outlet end. The flowing liquid will push the piston 300 open from the inlet 120 direction, so that the preload spring 410 is compressed and the inlet 120 is opened, and the liquid can flow out from the flow channel 110, outlet 130 and through hole 210. If the liquid flows in reverse, the hydraulic pressure of the reverse flow will press the piston 300 against the support ring 121, thereby preventing the liquid from flowing in reverse, thus assisting the diaphragm pump to stably deliver liquid.

[0032] During the movement of piston 300, guide rod 310 slides to guide piston 300. When piston 300 moves toward support ring 121, guide surface 321 assists in guiding piston 300, so that the bottom of limit groove 320 accurately abuts against support ring 121, thereby sealing inlet 120.

[0033] The specific embodiments described herein are merely illustrative examples of the spirit of this utility model; those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A one-way valve for a pump, characterized in that: The device includes a valve body (100), a bracket (200), a piston (300), and a pre-tightening member (400). The valve body (100) has a flow channel (110) with an inlet (120) and an outlet (130) at its two ends. The bracket (200) is connected to the valve body (100) and has a through hole (210) communicating with the outlet (130). The piston (300) is slidably disposed in the flow channel (110). The pre-tightening member (400) is disposed in the bracket (200) and applies a pre-tightening force to the piston (300) in the direction of the inlet (120), so that the piston (300) seals the inlet (120).

2. The pump check valve according to claim 1, characterized in that: A support ring (121) adapted to the piston (300) is provided at the inlet (120).

3. The pump check valve according to claim 2, characterized in that: The piston (300) has a guide rod (310) that slides with the support ring (121).

4. The pump check valve according to claim 3, characterized in that: The outer wall of the guide rod (310) has several weight-reducing grooves (311) spaced apart.

5. The pump check valve according to claim 2, characterized in that: The piston (300) has a limiting groove (320) at the end near the support ring (121), and the other end of the piston (300) has an installation groove (330). The side wall of the limiting groove (320) has a guide surface (321), and the bottom of the limiting groove (320) can abut against the end of the support ring (121).

6. The pump check valve according to claim 5, characterized in that: The pre-tensioning component (400) is a pre-tensioning spring (410), with one end of the pre-tensioning spring (410) abutting against the mounting groove (330) and the other end abutting against the bracket (200).

7. The pump check valve according to claim 6, characterized in that: The mounting groove (330) has a positioning post (331), and the positioning post (331) is located in the inner ring of the preload spring (410).

8. The pump check valve according to any one of claims 1-7, characterized in that: A connecting groove (131) is provided in the outlet (130), and a limiting ring (132) is provided on the side wall of the connecting groove (131); the outer wall of the bracket (200) has a flange (220), and after the flange (220) is inserted into the connecting groove (131), the limiting ring (132) limits the flange (220) axially.

9. The pump check valve according to claim 8, characterized in that: The end of the bracket (200) away from the valve body (100) is a small-diameter end (230), the outer diameter of the small-diameter end (230) is smaller than the outer diameter of the flange (220), and the inner wall of the small-diameter end (230) can limit the piston (300).

10. The pump check valve according to any one of claims 1-7, characterized in that: The valve body (100) has a flange (140) on the side near the inlet (120) or outlet (130).

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