A chemical-resistant plunger pump

Abstract

This utility model relates to the field of pump technology, and in particular to a chemical-resistant plunger pump. The technical solution includes: a power drive assembly, a reciprocating transmission assembly, and a pumping sealing assembly. The power drive assembly includes a geared motor and a housing. The reciprocating transmission assembly includes an eccentric assembly, a drive connecting rod, a return spring, and a connecting rod retainer. The pumping sealing assembly includes a packing gland adjuster, a packing gland body, a plunger body, a plunger compression nut, a plunger front body, a front cover assembly, and a front cover O-ring. This utility model has the advantages of strong corrosion resistance, good pressure resistance, and stable flow rate, solving the problems of easy diaphragm rupture, short lifespan, poor high-pressure resistance, insufficient flow stability, and easy corrosion and chemical-resistant seal failure in traditional diaphragm pumps.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, specifically to a plunger pump resistant to chemical agents. Background Technology

[0002] Pumps, as core machines for transporting or pressurizing fluids, are widely used in chemical, pharmaceutical, and wastewater treatment industries. In particular, in scenarios involving the transport of chemical agents, stringent requirements are placed on the pump's corrosion resistance, pressure resistance, and flow stability.

[0003] Traditional mechanical diaphragm pumps achieve fluid transport through flexible diaphragms. However, the soft diaphragms used are prone to corrosion and rupture when in prolonged contact with chemical agents, leading to frequent maintenance and short service life. Furthermore, the structural characteristics of diaphragm pumps make them inadequate under high-pressure conditions, and they exhibit significant flow errors under pressure, making it difficult to meet the demands for high-precision transport. While metal plunger pumps exist on the market, solving the high-pressure transport problem through a rigid plunger structure, metal components are easily corroded in highly corrosive chemical media, leading to seal failure and component damage, failing to meet the specific chemical corrosion resistance requirements of the chemical industry.

[0004] Therefore, a chemical-resistant plunger pump is proposed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a plunger pump resistant to chemical agents, which has the advantages of strong corrosion resistance, good pressure resistance and stable flow, and solves the problems of easy corrosion and rupture of diaphragm pumps, insufficient high pressure and flow stability, and easy corrosion and sealing failure of metal plunger pump components.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a chemical-resistant plunger pump, comprising a power drive assembly, a reciprocating transmission assembly, and a pumping sealing assembly. The power drive assembly includes a geared motor and a housing. The reciprocating transmission assembly includes an eccentric assembly, a drive link, a return spring, and a link retainer. The pumping sealing assembly includes a packing gland adjuster, a packing gland body, a plunger body, a plunger compression nut, a plunger front body, a front cover assembly, and a front cover O-ring.

[0007] The geared motor is mounted on the housing and drives the eccentric assembly to rotate. The eccentric assembly is used to drive the plunger body to perform reciprocating linear motion through the drive connecting rod. The connecting rod retainer is used to guide and limit the drive connecting rod, and the return spring is used to provide the reset force of the drive connecting rod. The packing body is wrapped around the outside of the plunger body. The packing body is used to form a sealing structure. The packing adjuster and the plunger clamping nut are used to limit the axial movement of the packing body. The plunger front body and the front cover assembly are sealed together by the front cover O-ring.

[0008] Preferably, the eccentric assembly is connected to the rear end of the drive link via a hinge structure, which is used to convert rotational motion into linear motion.

[0009] In the design, the hinge structure at the rear end of the eccentric assembly and the drive link converts the rotational motion of the eccentric assembly into the linear motion of the drive link. This hinge structure has the function of motion form conversion and adopts a hinge connection method.

[0010] Preferably, a guide engagement structure is provided between the drive link and the link retainer, and a guide hole is provided at the center of the link retainer for sliding guidance of the drive link.

[0011] In the design, the guiding fit structure between the drive link and the link retainer realizes the motion guidance of the drive link. The guide hole in the center of the link retainer has a sliding guiding function and is used to slide the drive link.

[0012] Preferably, an axial adjustment structure is provided between the packing gland adjuster and the front body of the plunger, and the front end face of the packing gland adjuster contacts the packing body through an annular boss, the annular boss being used to adjust the axial pressure of the packing body.

[0013] In the design, the axial adjustment structure between the packing regulator and the plunger front body realizes the adjustment of the axial pressure of the packing body. The annular boss on the front face of the packing regulator has the function of adjusting the axial pressure of the packing body. The annular boss is adjusted by contacting the packing body. The plunger front body is made of corrosion-resistant and chemical-resistant plastic material to improve the overall chemical corrosion resistance.

[0014] Preferably, the plunger clamping nut is threadedly connected to the front end of the plunger body, and the plunger clamping nut is used to axially fix the plunger body.

[0015] In the design, the plunger clamping nut and the threaded connection at the front end of the plunger body achieve axial fixation of the plunger body. The plunger clamping nut has the function of axially fixing the plunger body and is fixed by threaded connection. The plunger body is made of corrosion-resistant and chemical-resistant plastic material to avoid direct contact with chemical agents and corrosion.

[0016] Preferably, the front cover O-ring is embedded in the sealing groove of the mating surface between the front cover assembly and the plunger front body, and the front cover O-ring is used to form a radial seal.

[0017] In the design, the structure in which the front cover O-ring is embedded in the sealing groove of the mating surface between the front cover assembly and the front body of the plunger achieves radial sealing. The front cover O-ring has the function of forming radial sealing and is installed by embedding it in the sealing groove. The front cover assembly is made of corrosion-resistant and chemical-resistant plastic material, which, together with the front cover O-ring, enhances the corrosion resistance of the sealing parts.

[0018] Preferably, the rear end of the plunger front body is connected to the front end of the housing via flange bolts, and the flange bolt connection is used to form a closed transmission cavity.

[0019] In the design, the flange bolt connection between the rear end of the plunger front body and the front end of the housing realizes the formation of a closed transmission cavity. This flange bolt connection has the function of forming a closed transmission cavity and adopts the flange bolt connection method. The housing, together with the plunger front body made of corrosion-resistant and chemical-resistant plastic material, jointly constructs a corrosion-resistant transmission space.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention features a pumping sealing assembly consisting of a packing body, a packing adjuster, and a plunger clamping nut. The packing body is fitted around the outside of the plunger body to form a sealing structure. Combined with the packing body and front cover O-ring made of chemically resistant material, direct contact between chemicals and metal parts is avoided, achieving a strong corrosion resistance effect. This solves the problems of easy corrosion and rupture of the diaphragm in traditional diaphragm pumps and easy corrosion and sealing failure of metal plunger pump components.

[0022] The eccentric combination driven by the geared motor drives the plunger body to reciprocate. Combined with the guide and limit of the drive connecting rod by the connecting rod retainer and the reset force of the return spring, a stable rigid transmission structure is formed, which improves the pressure bearing capacity under high pressure conditions.

[0023] Meanwhile, the precise fit between the plunger body and the disc body, as well as the axial limiting design of the sealing components, reduces flow fluctuations under high pressure, achieving a stable flow effect and solving the problem of insufficient high-pressure performance and flow stability of traditional diaphragm pumps. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0025] Figure 2 This is a cross-sectional schematic diagram of the connection structure between the front cover assembly, the plunger front body, and the housing of this utility model;

[0026] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0027] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B.

[0028] In the diagram: 1. Front cover assembly; 2. Front cover O-ring; 3. Plunger front body; 4. Plunger clamping nut; 5. Plunger body; 6. Packing body; 7. Packing adjuster; 8. Connecting rod retainer; 9. Return spring; 10. Drive connecting rod; 11. Housing; 12. Eccentric assembly; 13. Gear motor. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, one embodiment of this utility model is provided: a chemical-resistant plunger pump, including a power drive assembly, a reciprocating transmission assembly, and a pumping sealing assembly; the power drive assembly includes a geared motor 13 and a housing 11; the reciprocating transmission assembly includes an eccentric assembly 12, a drive connecting rod 10, a return spring 9, and a connecting rod retainer 8; the pumping sealing assembly includes a packing gland adjuster 7, a packing gland body 6, a plunger body 5, a plunger compression nut 4, a plunger front body 3, a front cover assembly 1, and a front cover O-ring 2;

[0032] The geared motor 13 is installed on the housing 11 and drives the eccentric assembly 12 to rotate. The eccentric assembly 12 is used to drive the plunger body 5 to perform reciprocating linear motion through the drive connecting rod 10. The connecting rod retainer 8 is used to guide and limit the drive connecting rod 10, and the return spring 9 is used to provide the reset force of the drive connecting rod 10. The packing body 6 is wrapped around the outside of the plunger body 5. The packing body 6 is made of corrosion-resistant, chemical-resistant, and wear-resistant plastic elastic material. The packing body 6 is used to form a sealing structure. The packing adjuster 7 and the plunger clamping nut 4 are used to limit the axial movement of the packing body 6. The plunger front body 3 and the front cover assembly 1 are sealed together by the front cover O-ring 2.

[0033] Specifically, by setting up a pumping sealing assembly consisting of a packing body 6, a packing adjuster 7, and a plunger clamping nut 4, the packing body 6 is wrapped around the outside of the plunger body 5 to form a sealing structure. Combined with the packing body 6 made of chemical corrosion resistant material and the front cover O-ring 2, direct contact between chemical agents and metal parts is avoided, achieving a strong corrosion resistance effect. This solves the problems of easy corrosion and rupture of the diaphragm in traditional diaphragm pumps and easy corrosion and sealing failure of metal plunger pump components.

[0034] The eccentric assembly 12 driven by the geared motor 13 drives the plunger body 5 to reciprocate. Combined with the guide and limit of the drive connecting rod 10 by the connecting rod retainer 8 and the reset force of the return spring 9, a stable rigid transmission structure is formed, which improves the pressure bearing capacity under high pressure conditions.

[0035] Meanwhile, the precise fit between the plunger body 5 and the disc body 6, as well as the axial limiting design of the sealing components, reduces flow fluctuations under high pressure, achieving a stable flow effect and solving the problem of insufficient high-pressure performance and flow stability of traditional diaphragm pumps.

[0036] Example 2

[0037] To achieve chemical corrosion resistance and motion guidance adjustment functions, such as Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the eccentric assembly 12 is connected to the rear end of the drive link 10 through a hinge structure, which is used to convert rotational motion into linear motion.

[0038] Specifically, the hinge structure at the rear end of the eccentric assembly 12 and the drive link 10 converts the rotational motion of the eccentric assembly 12 into the linear motion of the drive link 10. This hinge structure has the function of motion form conversion and adopts a hinge connection method.

[0039] Furthermore, a guide engagement structure is provided between the drive link 10 and the link retainer 8, and a guide hole is provided in the center of the link retainer 8 for sliding guidance of the drive link 10.

[0040] Specifically, the guiding fit structure between the drive link 10 and the link retainer 8 enables the motion guidance of the drive link 10. The guide hole in the center of the link retainer 8 has a sliding guiding function and is used to slide guide the drive link 10.

[0041] Furthermore, an axial adjustment structure is provided between the packing gland adjuster 7 and the plunger front body 3. The front end face of the packing gland adjuster 7 contacts the packing body 6 through an annular boss, which is used to adjust the axial pressure of the packing body 6.

[0042] Specifically, the axial adjustment structure between the packing gland adjuster 7 and the plunger front body 3 realizes the adjustment of the axial pressure of the packing gland body 6. The annular boss on the front end face of the packing gland adjuster 7 has the function of adjusting the axial pressure of the packing gland body 6. The annular boss is adjusted by contacting the packing gland body 6. The plunger front body 3 is made of corrosion-resistant and chemical-resistant plastic material to improve the overall chemical corrosion resistance.

[0043] Example 3

[0044] To achieve the functions of axial fixation, radial sealing, and enclosing the transmission cavity, such as Figure 1, Figure 2 and Figure 3 As shown, in this embodiment, the plunger clamping nut 4 is connected to the front end of the plunger front body 3 by a thread, and the plunger clamping nut 4 is used to axially fix the plunger body 5.

[0045] Specifically, the threaded connection between the plunger clamping nut 4 and the front end of the plunger front body 3 achieves axial fixation of the plunger body 5. The plunger clamping nut 4 has the function of axially fixing the plunger body 5, and is fixed by threaded connection. The plunger body 5 is made of corrosion-resistant and chemical-resistant plastic material to avoid direct contact with chemical agents and corrosion.

[0046] Furthermore, the front cover O-ring 2 is embedded in the sealing groove of the mating surface between the front cover assembly 1 and the plunger front body 3, and the front cover O-ring 2 is used to form a radial seal.

[0047] Specifically, the structure in which the front cover O-ring 2 is embedded in the sealing groove of the mating surface between the front cover assembly 1 and the plunger front body 3 achieves radial sealing. The front cover O-ring 2 has the function of forming radial sealing and is installed by embedding in the sealing groove. The front cover assembly 1 is made of corrosion-resistant and chemical-resistant plastic material, which, together with the front cover O-ring 2, enhances the corrosion resistance of the sealing part.

[0048] Furthermore, the rear end of the plunger front body 3 is connected to the front end of the housing 11 by flange bolts, and the flange bolt connection is used to form a closed transmission cavity.

[0049] Specifically, the flange bolt connection between the rear end of the plunger front body 3 and the front end of the housing 11 realizes the formation of a closed transmission cavity. This flange bolt connection has the function of forming a closed transmission cavity and adopts the flange bolt connection method. The housing 11, together with the plunger front body 3 made of corrosion-resistant and chemical-resistant plastic material, jointly constructs a corrosion-resistant transmission space.

[0050] In use, the geared motor 13 is installed and fixed to the housing 11 to ensure a stable connection and provide a power foundation for subsequent transmission. The eccentric assembly 12 is installed inside the housing 11 and connected to the output end of the geared motor 13 to ensure normal drive rotation. The rear end of the drive link 10 is connected to the eccentric assembly 12 via a hinge structure to achieve the conversion from rotary motion to linear motion. The link retainer 8 is installed in place, allowing the drive link 10 to pass through its central guide hole, forming a sliding guide fit. A return spring 9 is installed at the corresponding position, engaging with the drive link 10 to provide a restoring force for the drive link 10.

[0051] The packing body 6 is looped around the outside of the plunger body 5 to form the foundation of the sealing structure. The packing adjuster 7 is assembled with the plunger front body 3 through an axial adjustment structure, so that the annular boss on the front end face of the packing adjuster 7 contacts the packing body 6 for subsequent adjustment of axial pressure. The plunger body 5 is inserted into the plunger front body 3, and the plunger body 5 is axially fixed by the threaded connection between the plunger clamping nut 4 and the front end of the plunger front body 3. The front cover O-ring 2 is embedded in the sealing groove of the mating surface between the front cover assembly 1 and the plunger front body 3, and then the front cover assembly 1 and the plunger front body 3 are sealed together.

[0052] The rear end of the plunger front body 3 is fixed to the front end of the housing 11 by flange bolt connection to form a closed transmission cavity, thus completing the overall assembly of the plunger pump.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A chemical-resistant plunger pump, comprising a power drive assembly, a reciprocating transmission assembly, and a pumping sealing assembly, wherein the power drive assembly comprises a geared motor (13) and a housing (11), the reciprocating transmission assembly comprises an eccentric assembly (12), a drive link (10), a return spring (9), and a link retainer (8), and the pumping sealing assembly comprises a packing gland adjuster (7), a packing gland body (6), a plunger body (5), a plunger clamping nut (4), a plunger front body (3), a front cover assembly (1), and a front cover O-ring (2), characterized in that: The geared motor (13) is installed on the housing (11) and drives the eccentric assembly (12) to rotate. The eccentric assembly (12) is used to drive the plunger body (5) to perform reciprocating linear motion through the drive connecting rod (10). The connecting rod retainer (8) is used to guide and limit the drive connecting rod (10). The return spring (9) is used to provide the reset force of the drive connecting rod (10). The packing body (6) is wrapped around the outside of the plunger body (5). The packing body (6) is used to form a sealing structure. The packing adjuster (7) and the plunger clamping nut (4) are used to limit the axial movement of the packing body (6). The plunger front body (3) and the front cover assembly (1) are sealed together by the front cover O-ring (2).

2. A chemical resistant piston pump according to claim 1, wherein The eccentric assembly (12) is connected to the rear end of the drive link (10) via a hinge structure, which is used to convert rotational motion into linear motion.

3. A chemical resistant piston pump according to claim 1, wherein A guide fit structure is provided between the drive link (10) and the link retainer (8). The link retainer (8) has a guide hole at its center, which is used to slide guide the drive link (10).

4. A chemical resistant piston pump according to claim 1 wherein, An axial adjustment structure is provided between the packing regulator (7) and the plunger front body (3). The front end face of the packing regulator (7) contacts the packing body (6) through an annular boss. The annular boss is used to adjust the axial pressure of the packing body (6).

5. A chemical resistant piston pump according to claim 1 wherein, The plunger clamping nut (4) is connected to the front end of the plunger front body (3) by a thread, and the plunger clamping nut (4) is used to axially fix the plunger body (5).

6. A chemical resistant piston pump according to claim 1 wherein, The front cover O-ring (2) is embedded in the sealing groove of the mating surface of the front cover assembly (1) and the plunger front body (3), and the front cover O-ring (2) is used to form a radial seal.

7. A chemical resistant piston pump according to claim 1 wherein, The rear end of the plunger front body (3) is connected to the front end of the housing (11) by flange bolts, and the flange bolt connection is used to form a closed transmission cavity.

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