A plunger pump

Abstract

A kind of plunger pump, it is related to the technical field of pump equipment technical field, including power end, hydraulic end, pump body, cylinder and plunger;The pump body between hydraulic end and cylinder is provided with centralizing ring, the central part of the front end of plunger is fixed with columnar extension, centralizing ring is matched with extension through sliding bearing, the pump body on the rear end of plunger is connected with sealing cover, the inner side of sealing cover is matched with plunger through sliding bearing, so that the two ends of plunger are under the centralizing of centralizing ring and sealing cover and reduce the friction to cylinder, at the same time, it will not produce eccentric wear to cylinder, and the accident of eccentric wear wearing cylinder is eliminated, since cylinder will not be worn, so pump will not occur large-scale leakage;Centralizing ring has through liquid flow hole in axial direction, and the volume change of plunger is transmitted to hydraulic end through liquid flow hole.

Description

Technical Field

[0001] This utility model belongs to the technical field of pump equipment, and in particular relates to a plunger pump. Background Technology

[0002] A plunger pump is a positive displacement fluid transport device that is widely used in production and daily life.

[0003] The most common failure of existing plunger pumps is severe wear or even wear through the cylinder block, which requires frequent cylinder block replacement. Replacing the cylinder block not only increases the operating cost but is also time-consuming and labor-intensive. Therefore, the subsequent operating and maintenance costs of existing plunger pumps remain high. Utility Model Content

[0004] To address the problem of piston pump cylinders being easily scratched or worn through, this utility model provides a piston straightening assembly inside the piston pump. By straightening the piston, the wear on the cylinder during reciprocating motion is reduced, thereby extending the cylinder replacement cycle and effectively reducing usage and maintenance costs.

[0005] The technical solution provided by this utility model is: a plunger pump, including a power end, a hydraulic end, a pump body, a cylinder, and a plunger. The power end is located at one end of the pump body, and the hydraulic end is located at the other end of the pump body. The cylinder is located inside the pump body, and the plunger slides into the cylinder. The plunger is connected to the power end, converting rotary motion into reciprocating motion. The cylinder is connected to the hydraulic end, completing the suction and discharge of liquid. A centralizing ring is provided on the pump body between the hydraulic end and the cylinder. A columnar extension is fixedly provided at the center of the front end of the plunger. The centralizing ring and the extension are connected by a sliding... The piston is fitted with a moving bearing, and the friction between the centralizing ring and the extension is rolling friction. A sealing cap is connected to the pump body at the rear end of the piston. The inner side of the sealing cap is fitted with the piston through a sliding bearing. Thus, the piston ends reduce the friction on the cylinder body under the centralizing action of the centralizing ring and the sealing cap, and at the same time, it will not cause uneven wear on the cylinder body, thus preventing accidents caused by uneven wear that can wear through the cylinder body. Since the cylinder body will not be worn through, the pump will not leak extensively. The centralizing ring has a through-hole in the axial direction, and the volume change of the piston is transmitted to the hydraulic end through the through-hole.

[0006] A further technical solution is as follows: the pump body between the hydraulic end and the cylinder is equipped with an exhaust liquid blocking valve, which includes an upper valve cylinder, an intermediate valve cylinder, and a lower valve cylinder connected in sequence. The inner side of the upper valve cylinder has a conical surface, the upper and lower inner sides of the intermediate valve cylinder have conical surfaces respectively, and the inner side of the lower valve cylinder has a conical surface. A space A is formed between the upper valve cylinder and the upper part of the intermediate valve cylinder, and a space B is formed between the lower part of the intermediate valve cylinder and the lower valve cylinder. A valve ball A is provided in space A, which can seal with the conical surface of the upper valve cylinder. A valve ball B is provided in space B, which can seal with the conical surface of the lower valve cylinder. An axial connecting hole is provided between the two conical surfaces of the intermediate valve cylinder, which connects space A and space B. The lower valve cylinder is connected to the pump body, and the overall density of the valve ball A is less than the density of the pumped liquid.

[0007] A further technical solution is: the pump body between the hydraulic end and the cylinder has an expansion neck, and the exhaust liquid blocking valve is connected to the pump body above the expansion neck.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. In this utility model, the plunger is centered at the front end by a centered ring and at the rear end by a sealing cap. Under the centered action of the centered components at both ends, the wear on the cylinder body during the reciprocating motion of the plunger is smaller, and the wear on the cylinder body in the circumferential direction is uniform, without uneven wear, without wearing through the cylinder body, and without large-area leakage.

[0010] 2. The exhaust liquid-blocking valve in this utility model can discharge the gas in the pump, prevent the liquid from flowing out, and reduce the adverse effects of gas mixed in the pump on the pump efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a cross-sectional view of the exhaust liquid-blocking valve in this utility model.

[0013] In the diagram: 1. Hydraulic end; 2. Centralizing ring; 3. Exhaust valve; 4. Pump body; 5. Cylinder; 6. Plunger; 7. Sealing cap; 8. Sliding bearing; 9. Power end; 10. Extension; 11. Neck expansion; 12. Flow hole; 301. Upper valve cylinder; 302. Intermediate valve cylinder; 303. Lower valve cylinder; 304. Space A; 305. Valve ball A; 306. Connecting hole; 307. Space B; 308. Valve ball B. Detailed Implementation

[0014] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] This utility model includes a power end 9, a hydraulic end 1, a pump body 4, a cylinder 5, and a plunger 6. The power end 9 is located at one end of the pump body 4, and the hydraulic end 1 is located at the other end of the pump body 4. The cylinder 5 is located inside the pump body 4, and the plunger 6 is slidably engaged with the cylinder 5. The plunger 6 is connected to the power end 9, converting rotational motion into reciprocating motion. The cylinder 5 is connected to the hydraulic end 1, completing the intake and discharge of liquid. The above is a common structure in the prior art (an existing technical solution), and will not be described in detail here.

[0019] The main innovative features of this utility model are as follows.

[0020] First, such as Figure 1As shown, a centralizing ring 2 is provided on the pump body 4 between the hydraulic end 1 and the cylinder body 5. A columnar extension 10 is fixedly provided at the center of the front end of the plunger 6. The centralizing ring 2 and the extension 10 are connected by a sliding bearing 8. The friction between the centralizing ring 2 and the extension 10 is rolling friction. A sealing cover 7 is connected to the pump body 4 at the rear end of the plunger 6. The inner side of the sealing cover 7 is connected to the plunger 6 by a sliding bearing 8. The friction is also sliding friction. Thus, the friction between the two ends of the plunger 6 and the cylinder body 5 is reduced under the centralizing action of the centralizing ring 2 and the sealing cover 7, and the cylinder body 5 is not subjected to uneven wear. This prevents the accident of uneven wear through the cylinder body 5. Since the cylinder body 5 will not be worn through, the pump will not leak extensively. The centralizing ring 2 has a through-hole 12 in the axial direction. The volume change of the plunger 6 is transmitted to the hydraulic end 1 through the through-hole 12.

[0021] The above features solve the long-standing problem of the plunger 6 wearing and wearing through the cylinder block 5. The friction between the straightening components at both ends of the plunger 6 and the plunger 6 is rolling friction, which is relatively small and causes less wear on the plunger 6.

[0022] Second, such as Figure 2 As shown, the pump body 4 between the hydraulic end 1 and the cylinder body 5 is equipped with an exhaust liquid blocking valve 3. The exhaust liquid blocking valve 3 includes an upper valve cylinder 301, an intermediate valve cylinder 302, and a lower valve cylinder 303 connected in sequence. The inner side of the upper valve cylinder 301 has a conical surface, the upper and lower inner sides of the intermediate valve cylinder 302 have conical surfaces, and the inner side of the lower valve cylinder 303 has a conical surface. A space A30 is formed between the upper valve cylinder 301 and the upper part of the intermediate valve cylinder 302. 4. A space B307 is formed between the lower part of the intermediate valve cylinder 302 and the lower valve cylinder 303. A valve ball A305 is provided in the space A304, which can seal with the conical surface of the upper valve cylinder 301. A valve ball B308 is provided in the space B307, which can seal with the conical surface of the lower valve cylinder 303. An axial connecting hole 306 is provided between the two conical surfaces of the intermediate valve cylinder 302, which connects the space A304 and the space B307. The lower valve cylinder 303 is connected to the pump body 4. The overall density of the valve ball A305 is less than the density of the pumped liquid.

[0023] The pump body 4 between the hydraulic end 1 and the cylinder 5 has an expansion neck 11, and the exhaust liquid blocking valve 3 is connected to the pump body 4 above the expansion neck 11.

[0024] The exhaust liquid-blocking valve 3 has the function of allowing gas to be discharged outwards while preventing liquid from being discharged outwards, specifically:

[0025] When gas enters the pump body 4, due to its low density, it will remain in the upper part of the expansion neck 11. Therefore, the gas will further enter the exhaust liquid-blocking valve 3. After entering the exhaust liquid-blocking valve 3, the gas passes through space B307 and space A304 from bottom to top. When passing through space B307, it will blow the valve ball B308 upward. The valve ball B308 may be forced to seal on the conical surface of the intermediate valve cylinder 302. Even so, the gas will still enter space A304 upward through the connecting hole 306. In space A304, since the airflow path of the connecting hole 306 does not overlap with the position of the valve ball A305, it will not blow the valve ball A305 upward. Therefore, the valve is in the open state, allowing the gas to be discharged.

[0026] After the gas inside the pump body 4 is completely discharged, the liquid will enter the exhaust liquid blocking valve 3. After entering the exhaust liquid blocking valve 3, the liquid will pass through space B307 and space A304 from bottom to top. After the liquid reaches space A304, since the overall density of valve ball A305 is less than the density of the pumped liquid, valve ball A305 will float up under the action of buoyancy until it reaches the conical surface of the upper valve cylinder 301 to form a seal. The valve is in the closed state, preventing the liquid from being discharged outward.

[0027] The discharge of gas from inside the pump body 4 can prevent a decrease in pump efficiency.

[0028] As the plunger 6 moves toward the power end 9, the valve ball B308 and the conical surface of the lower valve cylinder 303 form a seal, preventing external gas from entering the pump body 4.

[0029] In summary, this utility model has both a plunger 6 centering component to reduce wear and tear on the cylinder 5 and an exhaust liquid blocking valve 3 to discharge gas from the pump body 4 and prevent liquid from being discharged, thus having very outstanding beneficial effects.

Claims

1. A plunger (6) pump, comprising a power end (9), a hydraulic end (1), a pump body (4), a cylinder (5), and a plunger (6), wherein the power end (9) is disposed at one end of the pump body (4), the hydraulic end (1) is disposed at the other end of the pump body (4), the cylinder (5) is located inside the pump body (4), the plunger (6) is slidably engaged with the cylinder (5), the plunger (6) is connected to the power end (9) to convert rotational motion into reciprocating motion, and the cylinder (5) is connected to the hydraulic end (1) to complete the intake and discharge of liquid, characterized in that: A straightening ring (2) is provided on the pump body (4) between the hydraulic end (1) and the cylinder (5). An extension (10) is fixedly provided on the front end of the plunger (6). The straightening ring (2) and the extension (10) are connected by a sliding bearing (8). The straightening ring (2) has a through-hole (12) in the axial direction. A sealing cover (7) is connected on the pump body (4) at the rear end of the plunger (6). The inner side of the sealing cover (7) is connected to the plunger (6) by a sliding bearing (8). Thus, the plunger (6) reduces the friction on the cylinder (5) under the straightening action of the straightening ring (2) and the sealing cover (7).

2. A plunger (6) pump according to claim 1, characterized in that: The pump body (4) between the hydraulic end (1) and the cylinder body (5) is equipped with an exhaust liquid blocking valve (3). The exhaust liquid blocking valve (3) includes an upper valve cylinder (301), an intermediate valve cylinder (302), and a lower valve cylinder (303) connected in sequence. The inner side of the upper valve cylinder (301) has a conical surface, the upper and lower inner sides of the intermediate valve cylinder (302) have conical surfaces, and the inner side of the lower valve cylinder (303) has a conical surface. The upper valve cylinder (301) and the intermediate valve cylinder... Space A (304) is formed between the upper parts of (302), and space B (307) is formed between the lower part of the intermediate valve cylinder (302) and the lower valve cylinder (303). A valve ball A (305) is provided in space A (304), and a valve ball B (308) is provided in space B (307). An axial connecting hole (306) is provided between the two conical surfaces of the intermediate valve cylinder (302). The connecting hole (306) connects space A (304) and space B (307). The lower valve cylinder (303) is connected to the pump body (4). The overall density of the valve ball A (305) is less than the density of the pumped liquid.

3. A plunger (6) pump according to claim 2, characterized in that: The pump body (4) between the hydraulic end (1) and the cylinder (5) has an expansion neck (11), and the exhaust liquid blocking valve (3) is connected to the pump body (4) above the expansion neck (11).

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