A one-way valve structure for a plunger pump in a cleaning machine

Abstract

This utility model provides a one-way valve structure for a plunger pump in a cleaning machine, belonging to the technical field of cleaning machines. It solves the problems of existing one-way valves, such as the lack of effective axial guidance for the valve core, which easily leads to misalignment, resulting in sealing failure, accelerated wear, and unstable movement. This one-way valve structure includes a plunger pump body, with one-way valve assemblies in both the inlet and outlet chambers. The one-way valve assembly includes a one-way fixed seat, within which are sequentially arranged, interconnected first guide holes, second guide holes, and a fixed hole along the axial direction. A water-passing seat is fixed in the fixed hole. A closing element and a guide rod fixedly connected to it are slidably arranged in the second guide hole. A reset elastic element is sleeved around the guide rod, and one end of the guide rod extends into the first guide hole. This utility model provides precise axial positioning of the closing element through stepped guide holes, effectively preventing misalignment and rotation, ensuring uniform wear of the sealing pair, significantly improving sealing reliability, movement stability, and overall lifespan. Furthermore, the structure is compact, facilitating assembly and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of cleaning machine technology, specifically to a one-way valve structure for a plunger pump in a cleaning machine. Background Technology

[0002] The plunger pump in a high-pressure washer is a core component of the cleaning equipment. Its working principle involves a motor driving a plunger to reciprocate within a cylinder, changing the volume of the working chamber to achieve the intake and high-pressure discharge of the cleaning medium. To ensure unidirectional flow of the medium and prevent backflow of high-pressure water, a check valve is typically incorporated into the plunger pump. Traditional check valves often employ split or complex assembly designs, resulting in large size, high flow resistance, and limited inlet flow, thus affecting the overall performance and reliability of the machine.

[0003] To address the aforementioned issues, various integrated and compact one-way valve structures have been proposed in existing technologies. For example, Chinese invention patent CN103867431A discloses a "novel one-way valve structure for a high-pressure washer plunger pump." This structure designs the one-way valve body as an integrated component coaxially nested with the plunger valve sleeve, including a valve core cavity communicating with the plunger chamber. Within the valve core cavity, an outlet valve core cavity, an intermediate outlet flow channel, and an inlet valve core cavity are sequentially arranged. A circumferential inlet channel is provided around the valve body, which cooperates with the inner wall of the pump casing to form an annular inlet flow channel, and connects to the inlet valve core cavity through multiple intermediate inlet flow channels. Corresponding one-way valve core assemblies are installed in the outlet valve core cavity and the inlet valve core cavity, forming an integrated valve structure for bidirectional control of inlet and outlet water.

[0004] However, in this patent, the inlet check valve core assembly uses an inlet valve ball that directly seals with the intermediate inlet flow channel. Although an inlet spring is provided to provide clamping force, the valve ball lacks an effective axial guiding structure during opening and closing. Under high pressure and high frequency conditions, the valve ball is prone to radial displacement or rotation due to fluid impact, resulting in poor alignment between the valve core and the valve port, uneven wear of the sealing pair, and consequently, decreased sealing performance, increased internal leakage, and even valve core jamming or unstable opening and closing response. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a one-way valve structure for a plunger pump in a cleaning machine. The technical problem this invention aims to solve is to provide precise axial positioning for the one-way valve core through a compact guiding structure, thereby resolving issues such as sealing failure, accelerated wear, and motion instability caused by misalignment under high pressure and high frequency operation. Ultimately, this significantly improves the sealing reliability, motion stability, and overall lifespan of the valve core.

[0006] The objective of this utility model can be achieved through the following technical solution: a one-way valve structure for a plunger pump of a cleaning machine, comprising a plunger pump body, wherein the plunger pump body is provided with an inlet chamber and an outlet chamber, and both the inlet chamber and the outlet chamber are provided with a one-way valve assembly, wherein the one-way valve assembly includes a one-way fixed seat, wherein the one-way fixed seat is provided with a first guide hole, a second guide hole and a fixed hole that are interconnected along the axial direction, wherein a water passage seat is fixedly installed in the fixed hole, wherein a closing element and a guide rod fixedly connected to the closing element are slidably provided in the second guide hole, wherein a reset elastic element is sleeved on the outer periphery of the guide rod, and the end of the guide rod away from the closing element extends into the first guide hole.

[0007] Furthermore, the water-passing base is provided with a water-passing hole that connects to the second guide hole, and the side wall of the one-way fixed base is provided with a water-passing hole that connects radially to the second guide hole. The diameter of the second guide hole is larger than the diameter of the first guide hole and the water-passing hole, and the outer diameter of the closing member is infinitely close to the diameter of the second guide hole.

[0008] Furthermore, one end of the closing element abuts against or is away from the outer end face of the water inlet seat.

[0009] Furthermore, the unidirectional fixing seat includes a fixing part and a first guide part. The fixing hole is located inside the fixing part, and the first guide hole is located inside the first guide part. At least two guide posts are fixedly connected between the fixing part and the first guide part. The outer periphery of the guide posts is inclined, and a water passage hole is formed between two adjacent guide posts.

[0010] Furthermore, a sealing groove is formed between the outer periphery of the water-passing seat and the fixing part, and a sealing element is provided in the sealing groove.

[0011] Furthermore, the end of the one-way fixed seat away from the water inlet is fixedly abutted against a fixed end cap, and the fixed end cap is fixedly and sealed to the plunger pump body.

[0012] Furthermore, the plunger pump body is provided with a plunger cavity, and a plunger rod is provided inside the plunger cavity. One end of the plunger rod is connected to a crankshaft, which is driven by a motor. The plunger cavity connects the inlet cavity and the outlet cavity.

[0013] Furthermore, a water inlet hole is connected between the plunger cavity and the water inlet cavity, and the water passage hole is arranged opposite to the water inlet hole.

[0014] Furthermore, a water outlet hole is connected between the plunger cavity and the water outlet cavity, and the water inlet hole and the water outlet hole are arranged opposite to each other.

[0015] Compared with existing technologies, the technical advantages of this utility model are as follows: 1. The first guide hole and the second guide hole form a stepped guide hole, providing precise axial positioning for the closing element, effectively preventing it from shifting or rotating under the impact of high-pressure, high-frequency water flow. This ensures uniform wear of the sealing pair formed by the closing element and the water seat, significantly reducing the risk of internal leakage due to uneven wear, thereby ensuring long-term, stable sealing performance under high-pressure conditions and improving the reliability and durability of the entire machine. 2. The entire one-way valve assembly is highly integrated, and the modular design makes the structure more compact, facilitating assembly and maintenance. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention.

[0017] Figure 2 This is an enlarged view of section A of this utility model.

[0018] Figure 3 This is a perspective view of the one-way valve assembly of this utility model.

[0019] Figure 4 This is a three-dimensional view of the internal structure of the cleaning machine of this utility model.

[0020] Drawing number markings: 10. Plunger pump body; 11. Plunger cavity; 12. Inlet chamber; 13. Outlet chamber; 14. Plunger rod; 15. Crankshaft; 16. Inlet hole; 17. Outlet hole; 20. One-way valve assembly; 21. One-way fixed seat; 211. First guide hole; 212. Second guide hole; 213. Fixed hole; 214. First guide part; 215. Fixed part; 216. Guide post; 217. Water passage hole; 218. Sealing groove; 22. Closing element; 23. Guide rod; 24. Reset elastic element; 25. Water inlet seat; 251. Water inlet hole; 26. Sealing element; 27. Fixed end cap. Detailed Implementation

[0021] 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.

[0022] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined 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 are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] according to Figures 1 to 4As shown, a one-way valve structure for a plunger pump in a cleaning machine is disclosed. The cleaning machine includes a plunger pump and a motor. The working principle of the plunger pump is based on the reciprocating motion of the plunger and the coordinated operation of the one-way valve to achieve continuous water intake, pressurization, and discharge, ultimately forming a high-pressure water flow. The plunger pump includes a plunger pump body 10, which is provided with a plunger chamber 11, an inlet chamber 12, and an outlet chamber 13. A plunger rod 14 is disposed in the plunger chamber 11, and one end of the plunger rod 14 is connected to a crankshaft 15, which is driven by a motor. The plunger chamber 11 connects the inlet chamber 12 and the outlet chamber 13. An inlet hole 16 connects the plunger chamber 11 and the inlet chamber 12, and a water passage hole 217 is disposed opposite to the inlet hole 16. An outlet hole 17 connects the plunger chamber 11 and the outlet chamber 13, and a water passage hole 251 is disposed opposite to the outlet hole 17.

[0024] Both the inlet chamber 12 and the outlet chamber 13 are equipped with a one-way valve assembly 20. The one-way valve assembly 20 includes a one-way fixed seat 21. The one-way fixed seat 21 has a first guide hole 211, a second guide hole 212 and a fixed hole 213 that are interconnected along the axial direction. A water passage seat 25 is fixedly installed in the fixed hole 213. A closing element 22 and a guide rod 23 fixedly connected to the closing element 22 are slidably arranged in the second guide hole 212. A reset elastic element 24 is sleeved on the outer periphery of the guide rod 23. The end of the guide rod 23 away from the closing element 22 extends into the first guide hole 211.

[0025] The water-passing base 25 is provided with a water-passing hole 251 that connects to the second guide hole 212. The side wall of the one-way fixed base 21 is provided with a water-passing hole 217 that connects to the second guide hole 212 radially. The diameter of the second guide hole 212 is larger than the diameter of the first guide hole 211 and the water-passing hole 251. The outer diameter of the closing member 22 is infinitely close to the diameter of the second guide hole 212.

[0026] One end of the closing element 22 abuts against or is away from the outer end face of the water inlet seat 25.

[0027] The one-way fixed seat 21 includes a fixed part 215 and a first guide part 214. A fixed hole 213 is located inside the fixed part 215, and a first guide hole 211 is located inside the first guide part 214. At least two guide posts 216 are fixedly connected between the fixed part 215 and the first guide part 214. The outer periphery of the guide posts 216 is inclined, and a water passage hole 217 is formed between two adjacent guide posts 216. A sealing groove 218 is formed between the outer periphery of the water passage seat 25 and the fixed part 215, and a sealing element 26 is provided in the sealing groove 218. A reinforcing rib is provided in the middle of the guide post 216. A fixed end cap 27 is fixedly abutted against the end of the one-way fixed seat 21 away from the water passage seat 25, and the fixed end cap 27 is fixedly and sealed to the plunger pump body 10.

[0028] The first guide hole 211 and the second guide hole 212 form a stepped guide hole, which provides precise axial positioning for the closing element 22, effectively preventing it from shifting or rotating under the impact of high-pressure and high-frequency water flow. This ensures uniform wear of the sealing pair formed by the closing element 22 and the water inlet seat 25, significantly reducing the risk of internal leakage caused by uneven wear. This ensures long-term and stable sealing performance under high-pressure conditions and improves the reliability and durability of the entire machine.

[0029] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A one-way valve structure for a plunger pump of a cleaning machine, comprising a plunger pump body (10), wherein the plunger pump body (10) is provided with an inlet chamber (12) and an outlet chamber (13), and both the inlet chamber (12) and the outlet chamber (13) are provided with a one-way valve assembly (20), characterized in that: The one-way valve assembly (20) includes a one-way fixed seat (21). The one-way fixed seat (21) is provided with a first guide hole (211), a second guide hole (212) and a fixed hole (213) that are interconnected along the axial direction. A water-passing seat (25) is fixedly installed in the fixed hole (213). A closing element (22) and a guide rod (23) fixedly connected to the closing element (22) are slidably provided in the second guide hole (212). A reset elastic element (24) is sleeved on the outer periphery of the guide rod (23). The end of the guide rod (23) away from the closing element (22) extends into the first guide hole (211).

2. The one-way valve structure of a plunger pump for a cleaning machine according to claim 1, characterized in that: The water-passing base (25) is provided with a water-passing hole (251) that connects to the second guide hole (212). The side wall of the one-way fixed base (21) is provided with a water-passing hole (217) that connects to the second guide hole (212) radially. The diameter of the second guide hole (212) is larger than the diameter of the first guide hole (211) and the water-passing hole (251). The outer diameter of the closing member (22) is infinitely close to the diameter of the second guide hole (212).

3. The one-way valve structure of a plunger pump for a cleaning machine according to claim 2, characterized in that: One end of the closing element (22) abuts against or moves away from the outer end face of the water inlet seat (25).

4. The one-way valve structure of a plunger pump for a cleaning machine according to claim 3, characterized in that: The one-way fixing seat (21) includes a fixing part (215) and a first guide part (214). The fixing hole (213) is located in the fixing part (215), and the first guide hole (211) is located in the first guide part (214). At least two guide posts (216) are fixedly connected between the fixing part (215) and the first guide part (214). The outer periphery of the guide post (216) is inclined, and a water passage hole (217) is formed between two adjacent guide posts (216).

5. The one-way valve structure of a plunger pump for a cleaning machine according to claim 4, characterized in that: A sealing groove (218) is formed between the outer periphery of the water-passing seat (25) and the fixing part (215), and a sealing element (26) is provided in the sealing groove (218).

6. The one-way valve structure of a plunger pump for a cleaning machine according to claim 5, characterized in that: The one-way fixed seat (21) is fixedly abutted against a fixed end cap (27) at the end away from the water inlet seat (25), and the fixed end cap (27) is fixedly and sealed to the plunger pump body (10).

7. A one-way valve structure for a plunger pump of a cleaning machine according to any one of claims 2 to 6, characterized in that: The plunger pump body (10) is provided with a plunger cavity (11), and a plunger rod (14) is provided in the plunger cavity (11). One end of the plunger rod (14) is connected to a crankshaft (15), which is driven by a motor. The plunger cavity (11) is connected to the water inlet cavity (12) and the water outlet cavity (13).

8. The one-way valve structure of a plunger pump for a cleaning machine according to claim 7, characterized in that: The plunger cavity (11) and the water inlet cavity (12) are connected by a water inlet hole (16), and the water passage hole (217) is arranged opposite to the water inlet hole (16).

9. The one-way valve structure of a plunger pump for a cleaning machine according to claim 7, characterized in that: The plunger cavity (11) and the water outlet cavity (13) are connected by a water outlet hole (17), and the water passage hole (251) is arranged opposite to the water outlet hole (17).

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