Ceramic pump with novel liquid channel structure

Abstract

The utility model discloses a ceramic pump with a novel liquid channel structure, which belongs to the technical field of plunger pumps, and comprises a cylindrical ceramic sleeve, a groove valve type metering rod, a liquid nozzle amplification sleeve and a liquid nozzle component, the side wall of the ceramic sleeve is provided with a liquid channel port, the groove valve type metering rod is movably connected inside the ceramic sleeve, and the liquid nozzle amplification sleeve is provided with a liquid channel port. The liquid nozzle amplification sleeve is installed on the outer side wall of the ceramic sleeve, a channel hole matched with the liquid channel opening is formed in the side wall of the liquid nozzle amplification sleeve, and the liquid nozzle assembly is detachably installed in the channel hole. The utility model solves the problems of poor reliability, inconvenience in assembly and maintenance and the like in the prior art, and has reliability, maintainability and economical efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plunger pump, concretely relates to a ceramic pump with novel liquid channel structure. BACKGROUND

[0002] The ceramic plunger pump is a kind of precision fluid conveying equipment made of high-purity zirconia or alumina ceramic material.Because ceramic material has extremely high hardness, wear resistance, corrosion resistance and excellent biological inertia, ceramic plunger pump is widely used in pharmaceutical, biological engineering, food and beverage and other fields with extremely high requirements on hygiene level, purity and durability.

[0003] Although the ceramic plunger pump has excellent performance, the connection structure of the liquid channel port and the external hose has always been a design and manufacturing difficulty, and the existing technical solutions all have obvious deficiencies.The first type of solution is to assemble a stainless steel sleeve with a fixed liquid nozzle and a ceramic pump sleeve into an integrated body through interference fit.This solution does not meet the requirements of Good Manufacturing Practice (GMP), because the thermal expansion coefficients of ceramic and metal are different, and micro gaps will be generated between them under temperature change, causing the drug solution or cleaning solution to seep in and stay, forming dead angles that cannot be completely cleaned, and there is a serious risk of cross contamination.The second type of solution is to directly process an integrated ceramic liquid nozzle on the ceramic pump sleeve, which fully meets the GMP requirements;But ceramic is a hard and brittle material, and the processing difficulty is extremely great, the yield is low, the cost is high, and the protruding ceramic liquid nozzle is easily broken during assembly and transportation.

[0004] The third type of solution is currently more popular, that is, a split type liquid nozzle assembly is used: first, a stainless steel sleeve is prepared, a hollow liquid nozzle connecting piece with external threads is welded together with the stainless steel sleeve or a larger material is milled into the required component of the above structure, then a liquid nozzle with a hose connecting section is inserted and screwed on the liquid nozzle connecting piece through a compression nut, and the O-ring is compressed on the flat surface of the ceramic pump sleeve to achieve sealing.

[0005] However, this solution still has some problems:

[0006] 1) The stainless steel sleeve, if using welding process, the welding deformation makes it difficult to ensure the size accuracy, and the overall milling causes serious material waste and high processing cost;

[0007] 2) The exposed external threads are easily damaged during repeated disassembly and cleaning;

[0008] 3) During installation, the liquid nozzle will rotate with the compression nut, causing the sealing ring to be damaged due to friction with the O-ring.To solve the rotation problem, a pin is usually added to the lower end of the liquid nozzle and a groove is milled on the connecting piece, but this will damage the strength of the external threads and the processing is complex;

[0009] 4) The lack of an effective rotational positioning mechanism makes it easy for the O-ring to be over-compressed due to over-tightening, which shortens its service life and affects the reliability of the seal.

[0010] Therefore, how to provide a ceramic pump with a novel liquid channel structure to overcome the shortcomings of the existing technology is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0011] Therefore, this utility model provides a ceramic pump with a novel liquid channel structure to solve the problems in the prior art.

[0012] To achieve the above objectives, this utility model provides the following technical solution:

[0013] This utility model discloses a ceramic pump with a novel liquid channel structure, comprising:

[0014] The ceramic sleeve is cylindrical with liquid channel openings on its side walls;

[0015] A slotted valve-type metering rod is movably connected inside the ceramic sleeve;

[0016] A liquid nozzle amplification sleeve is installed on the outer wall of the ceramic sleeve, and a channel hole that matches the liquid channel opening is provided on the side wall of the liquid nozzle amplification sleeve.

[0017] The nozzle assembly is detachably installed within the channel hole.

[0018] Furthermore, the nozzle assembly includes:

[0019] A liquid outlet connector is disposed inside the channel hole. A circular groove is provided on the end face of the liquid outlet connector that contacts the ceramic sleeve, and an O-ring is disposed in the circular groove.

[0020] A clamping nut is fitted onto the outer wall of the liquid outlet connector, and the clamping nut is used to drive the liquid outlet connector to fit tightly against the ceramic sleeve.

[0021] Furthermore, a platform is formed on the outer wall of the ceramic sleeve around the position of the liquid channel opening, a boss is formed between the outer wall of the ceramic sleeve and the platform, and a flat part is formed at the end of the liquid outlet connector to cooperate with the platform. The liquid outlet connector is embedded in the end face of the platform through the flat part.

[0022] Furthermore, the inner wall of the channel hole is provided with an internal thread, and the outer wall of the clamping nut is provided with an external thread, and the clamping nut is threadedly connected to the channel hole.

[0023] Further, the distance from the boss to the platform is 2-3mm, and the height of the flat position is 0.5-1.0mm less than the distance from the boss to the platform.

[0024] Further, the liquid outlet connector is a clamp chuck.

[0025] Further, the platform is a round bottom platform or a square bottom platform.

[0026] Further, the liquid nozzle expansion sleeve is made of metal or PEEK material.

[0027] The utility model has the following advantages:

[0028] The utility model discloses a split liquid nozzle expansion sleeve and modular liquid nozzle assembly, which simplify the overall structure and optimize the processing technology. The liquid nozzle expansion sleeve can be integrally formed by turning or injection molding, which completely eliminates the complex welding process and the deformation problem caused by the welding process, and avoids material waste and processing difficulty caused by overall milling.

[0029] The inner thread is arranged on the inner wall of the channel hole, and the outer thread of the compression nut is wrapped therein, which solves the problem of exposed outer thread being easily damaged by repeated disassembly, cleaning and sterilization in the prior art, and significantly improves the durability and long-term reliability of the connecting part.

[0030] The platform with a boss is arranged on the outer sidewall of the ceramic sleeve, and the flat position is arranged at the lower end of the liquid outlet connector, which constitutes a rotation prevention and compression limiting dual function structure. Specifically, the embedded cooperation of the flat position and the platform can effectively prevent the liquid nozzle from rotating when the compression nut is tightened, which eliminates the hidden danger of O-ring damage caused by rotation friction. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed in the embodiments or the prior art description.

[0032] The structure, proportion, size and the like shown in the specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0033] Figure 1 The ceramic pump provided by the utility model with novel liquid channel structure assembly diagram;

[0034] Figure 2 The ceramic pump provided by the utility model with novel liquid channel structure structure diagram;

[0035] Figure 3 The platform and boss structure diagram provided by the utility model;

[0036] Figure 4 The liquid outlet connecting piece cross section and left view schematic diagram provided by the utility model;

[0037] Figure 5 The square bottom platform structure diagram provided by the second embodiment of the utility model;

[0038] Figure 6 The liquid outlet connecting piece and compression nut connection relationship diagram provided by the third embodiment of the utility model.

[0039] In the figure: 1 ceramic sleeve; 11 liquid channel port; 12 slot valve type metering rod; 13 platform; 14 boss; 2 liquid nozzle expansion sleeve; 21 channel hole; 211 internal thread; 3 liquid nozzle assembly; 31 liquid outlet connecting piece; 32 circular groove; 33 O-ring; 34 compression nut; 341 external thread; 35 flat position. DETAILED DESCRIPTION

[0040] The embodiments of the utility model will be described below by specific examples. Those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0041] Please refer to Figures 1-6 , the ceramic pump with novel liquid channel structure disclosed by the utility model will be described. The utility model has four parts, such as Figure 1 , Figure 2As shown, including ceramic sleeve 1, slot valve type metering rod 12, liquid nozzle expansion sleeve 2 and liquid nozzle assembly 3, ceramic sleeve 1 is cylindrical, liquid passage opening 11 is formed on the side wall, slot valve type metering rod 12 is movably connected inside the ceramic sleeve 1, liquid nozzle expansion sleeve 2 is installed on the outer side wall of the ceramic sleeve 1, liquid nozzle expansion sleeve 2 is formed with passage hole 21 on the side wall, which cooperates with liquid passage opening 11, and liquid nozzle assembly 3 is detachably installed in passage hole 21.

[0042] In this embodiment, the shape of ceramic sleeve 1 and liquid nozzle expansion sleeve 2, the setting position of liquid nozzle expansion sleeve 2 and liquid nozzle assembly 3 are as shown. Figure 1 As shown, the side wall of the ceramic sleeve 1 is symmetrically provided with two liquid passage openings 11, and the side wall of the liquid nozzle expansion sleeve 2 is provided with two matched passage holes 21. The application installs one liquid nozzle expansion sleeve 2 on the outer side of the ceramic sleeve 1, and realizes the detachable installation of the liquid nozzle assembly 3 through the liquid nozzle expansion sleeve 2. Compared with the liquid nozzle connecting piece with external thread 341 in the traditional structure which needs to be welded with the stainless steel sleeve, it does not need to be welded, eliminates the welding deformation, and the concentricity of the product is better; compared with the overall milling processing scheme in the traditional structure, the processing difficulty is smaller, the material is saved, and the cost is reduced.

[0043] Through the modular design of the split type liquid nozzle expansion sleeve 2 and the standardized liquid nozzle assembly 3, the overall structure is simplified and the processing technology is optimized. The liquid nozzle expansion sleeve 2 can be integrally formed by turning, injection molding and other more economical and efficient processes, completely abandoning the complex welding process and the deformation problem caused by the welding process, and avoiding the material waste and processing difficulty caused by the overall milling. This design greatly reduces the manufacturing cost while ensuring the precision and strength, and improves the production efficiency and product consistency.

[0044] Preferably, the liquid nozzle expansion sleeve 2 is made of metal or PEEK material. When the liquid nozzle expansion sleeve 2 is made of metal material, the ceramic sleeve 1 and the liquid nozzle expansion sleeve 2 are assembled into a whole through interference fit; when the liquid nozzle expansion sleeve 2 is made of PEEK material, the ceramic sleeve 1 and the liquid nozzle expansion sleeve 2 are assembled through gap fit to form two detachable components. The liquid nozzle expansion sleeve 2 can also be made of other plastic materials.

[0045] By setting the liquid nozzle expansion sleeve 2 and the liquid nozzle assembly 3, the main function of the connecting structure is separated from the core ceramic component, so that the complex thread processing and channel forming processes are transferred from the high-hardness and difficult-to-process ceramic material to the more easily processed metal or PEEK material liquid nozzle expansion sleeve 2 and liquid nozzle assembly 3, which fundamentally solves the problems of difficult processing, high cost and easy brittle fracture of ceramic liquid nozzle, and does not need welding, which eliminates the welding deformation and the concentricity of the product is higher.

[0046] As shown in Figure 2 , Figure 4As shown, the liquid nozzle assembly 3 comprises a liquid outlet connector 31 and a compression nut 34. The liquid outlet connector 31 is arranged inside the passage hole 21. A circular groove 32 is formed on the end surface of the liquid outlet connector 31 which is in contact with the ceramic sleeve 1. An O-ring 33 is arranged in the circular groove 32. The compression nut 34 is arranged on the outer side wall of the liquid outlet connector 31. The compression nut 34 is used to drive the liquid outlet connector 31 to tightly adhere to the ceramic sleeve 1. Figure 2 As shown, an inner thread 211 is formed on the inner side wall of the passage hole 21. An outer thread 341 is formed on the outer side wall of the compression nut 34. The compression nut 34 is threadedly connected with the passage hole 21.

[0047] In the embodiment, the shapes of the liquid outlet connector 31 and the compression nut 34 are as shown. Figure 2 , Figure 4 The inner diameter of the circular groove 32 is slightly larger than the inner diameter of the liquid passage port 11. The compression nut 34 is a hollow fastener with an outer thread 341. The outer thread 341 of the compression nut 34 matches the inner thread 211 of the passage hole 21. The inner diameter of the compression nut 34 is slightly larger than the middle section of the liquid outlet connector 31 but smaller than the diameter of the lower end of the liquid outlet connector 31. Therefore, the lower end of the liquid outlet connector 31 can be squeezed to compress the O-ring 33, thereby achieving the sealing effect.

[0048] The liquid outlet connector 31 and the compression nut 34 are significantly different from the conventional structure. In the conventional structure, a liquid nozzle connector with an outer thread is welded outside the stainless steel sleeve. The compression nut in this structure is arranged on the outer side of the liquid nozzle connector. The ceramic pump needs to be repeatedly disassembled and cleaned during use. The outer thread is easily damaged during the process. In the present application, a passage hole 21 with an inner thread 211 is machined on the side wall of the liquid nozzle expansion sleeve 2 corresponding to the liquid passage port 11. An outer thread 341 is machined on the outer side wall of the compression nut 34. The compression nut 34 is threadedly connected in the passage hole 21. This has the advantage of avoiding the exposure of the thread, which is damaged during repeated disassembly and cleaning.

[0049] When the liquid outlet connector 31 is used to connect a hose, as shown. Figure 2 The end of the liquid outlet connector 31 close to the ceramic sleeve 1 is the lower end. The end of the liquid outlet connector 31 away from the ceramic sleeve 1 is the upper end. The upper end of the liquid outlet connector 31 is used to connect the hose. The outer diameter of the middle section of the liquid outlet connector 31 is slightly smaller than the compression nut 34 by 0.1-0.3 mm. The diameter of the lower end of the liquid outlet connector 31 is larger than the middle section by 2-6 mm. The length of the channel in the liquid outlet connector 31 is 4-7 mm.

[0050] Preferably, the liquid outlet connector 31 is a clamp chuck. The liquid outlet connector 31 can be a clamp chuck according to the needs of the customer. When the liquid outlet connector 31 is a clamp chuck, as shown. Figure 6The third embodiment of the utility model is shown. First, the compression nut 34 is sleeved on the outer sidewall of the clamp chuck, and the clamp chuck is welded to form a complete whole, and the connection mode of the clamp chuck and the liquid nozzle expansion sleeve 2 is not changed, so it is not described herein. The application has good expansibility and applicability, and users can flexibly select or replace different types of liquid outlet connectors 31 according to different pipeline connection requirements, thereby improving the adaptation capability and application flexibility of the entire ceramic pump system.

[0051] By arranging the internal thread 211 on the inner wall of the channel hole 21 and wrapping the external thread 341 of the compression nut 34 in the internal thread 211, the problem that the exposed external thread 341 is easily damaged by knocking during repeated disassembly, cleaning and sterilization is solved, and the durability and long-term reliability of the connecting component are significantly improved.

[0052] As shown in Figure 2 , Figure 3 The outer sidewall of the ceramic sleeve 1 is provided with a platform 13 around the position of the liquid passage opening 11, a boss 14 is formed between the outer sidewall of the ceramic sleeve 1 and the platform 13, the end of the liquid outlet connector 31 is formed with a flat position 35 matched with the platform 13, and the liquid outlet connector 31 is embedded on the end face of the platform 13 through the flat position 35. Preferably, the distance from the boss 14 to the platform 13 is 2-3mm, and the height of the flat position 35 is smaller than the distance from the boss 14 to the platform 13 by 0.5-1.0mm. Preferably, the platform 13 is a round-bottom platform 13 or a square-bottom platform 13.

[0053] The shapes of the platform 13 and the boss 14 are shown in Figure 3 A special platform 13 is milled on the outer circle of the liquid passage opening 11 of the ceramic sleeve 1. The platform 13 can usually have two shapes, one is a round-bottom platform 13, and the other is a square-bottom platform 13. When the round-bottom platform 13 is milled, one to two places are not completely milled, leaving a small boss 14. The height of the boss 14 from the height of the platform 13 is usually 2-3mm (its function is to control the compression height of the O-ring 33 within a certain range to prevent excessive compression of the O-ring 33 when the liquid outlet connector 31 is assembled).

[0054] The lower end of the liquid outlet connector 31 has two key designs. One is a circular groove 32 for installing the O-ring 33 at the bottom, and the diameter of the circular groove 32 is smaller than the diameter of the O-ring 33 by 0.5-2mm. The other is the milled flat position 35, which is usually 2-3mm high, and the height is smaller than the height of the boss 14 on the ceramic sleeve 1 by 0.5-1.0mm (this is the height of the O-ring 33 after compression for sealing). Its functions are as follows: one is to limit the compression height of the O-ring 33; the other is to prevent the liquid outlet connector 31 from rotating when it is pressed by the compression nut 34.

[0055] The platform 13 with the boss 14 arranged on the outer side wall of the ceramic sleeve 1 and the flat position 35 arranged at the lower end of the liquid outlet connector 31 cooperatively constitute a double function structure of anti-rotation and compression limiting. Specifically, the embedded cooperation of the flat position 35 and the platform 13 can effectively prevent the liquid nozzle from rotating with the tightening of the compression nut 34, and eliminate the hidden danger of damage of the O-ring 33 caused by the rotation friction; at the same time, the precise difference design of the height of the boss 14 and the height of the flat position 35 provides physical limiting for the compression amount of the O-ring 33, prevents the O-ring 33 from being excessively compressed, stress relaxed and prematurely failed caused by excessive tightening, and thus ensures the long-term stability and consistency of the sealing, and prolongs the service life of the sealing element.

[0056] Although the utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the scope of protection required by the utility model.

Claims

1. A ceramic pump with a novel liquid channel structure, characterized in that, The utility model relates to a liquid nozzle assembly of a liquid metering device, comprising: a ceramic sleeve (1) in a cylindrical shape, with a liquid passage opening (11) on the side wall; a slot valve type metering rod (12) movably connected inside the ceramic sleeve (1); a liquid nozzle expansion sleeve (2) installed on the outer side wall of the ceramic sleeve (1), with a passage hole (21) on the side wall of the liquid nozzle expansion sleeve (2) matching the liquid passage opening (11); a liquid nozzle assembly (3) detachably installed in the passage hole (21); the liquid nozzle assembly (3) comprises: a liquid outlet connecting piece (31) arranged inside the passage hole (21), with a circular groove (32) on the end surface of the liquid outlet connecting piece (31) in contact with the ceramic sleeve (1), and an O-ring (33) arranged in the circular groove (32); a compression nut (34) sleeved on the outer side wall of the liquid outlet connecting piece (31), used to drive the liquid outlet connecting piece (31) to tightly adhere to the ceramic sleeve (1); the outer side wall of the ceramic sleeve (1) is provided with a platform (13) around the position of the liquid passage opening (11), and a boss (14) is formed between the outer side wall of the ceramic sleeve (1) and the platform (13), and the end of the liquid outlet connecting piece (31) is formed with a flat position (35) matching the platform (13), and the liquid outlet connecting piece (31) is embedded on the end surface of the platform (13) through the flat position (35).

2. The ceramic pump having a novel liquid passage structure according to claim 1, wherein an inner thread (211) is arranged on the inner side wall of the passage hole (21), and an outer thread (341) is arranged on the outer side wall of the compression nut (34), and the compression nut (34) is threadedly connected with the passage hole (21).

3. The ceramic pump having a novel liquid passage structure according to claim 1, wherein The distance from the boss (14) to the platform (13) is 2-3mm, and the height of the flat position (35) is smaller than the distance from the boss (14) to the platform (13) by 0.5-1.0mm.

4. The ceramic pump having a novel liquid passage structure according to claim 1, wherein The liquid outlet connecting piece (31) is a clamp chuck.

5. The ceramic pump having a novel liquid passage structure according to claim 1, wherein The platform (13) is a round bottom platform (13) or a square bottom platform (13).

6. The ceramic pump having a novel liquid passage structure according to claim 1, wherein The liquid nozzle expansion sleeve (2) is made of metal or PEEK material.

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