Rotary valve plunger pump

Abstract

The utility model discloses a rotary valve plunger pump which comprises a pump body assembly and a metering rod arranged at the lower end of the pump body assembly in a penetrating mode, a cleaning outlet and an anti-crystallization inlet are formed in the outer side of the lower end of the pump body assembly, a first groove is formed in the inner wall of the lower end of the pump body assembly, the cleaning outlet and the anti-crystallization inlet are both communicated with the first groove, and a second groove is formed in the outer wall of the metering rod. A third groove is formed in the inner wall of the upper end of the pump body assembly, and the second groove can communicate with the third groove and the first groove. During filling, an anti-crystallization buffering agent can be continuously added through the anti-crystallization inlet, the anti-crystallization buffering agent enters the cavity formed by the first groove and the second groove and finally flows out from the cleaning outlet, the solute concentration of liquid medicine in the pump can be effectively controlled in the continuous flowing process, the PH value of a solvent can be stabilized, and the service life of the pump is prolonged. The pump body assembly, the metering rod and the corresponding connectors are continuously cleaned, contact between a liquid medicine solvent and air is cut off, and the purpose of preventing crystallization is achieved, so that the maintenance period is prolonged, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of food and medicine filling equipment, in particular to a rotary valve plunger pump. Background Art

[0002] At present, plunger pumps are widely used in industries such as food and medicine. Since metal pumps have low hardness, poor wear and corrosion resistance, and are not resistant to high temperatures, ceramic materials are mostly used to make plunger pumps. After the ceramic pump is used for a period of time or when it is necessary to switch to filling different liquid medicines, it needs to be cleaned and sterilized. Some ceramic pumps can directly clean the pump body and the pump rod on the production line by setting a cleaning inlet and a cleaning outlet on the pump body, without disassembling and assembling from the production line, that is, they have the function of on-line cleaning and sterilization. However, when filling the solution, the surface of the metering rod will adhere to the liquid medicine. When the solute concentration in the solution is too high or the solubility of the solute decreases, crystals will precipitate, causing the pump body and the metering rod to stick and jam, shortening the equipment maintenance cycle, affecting production efficiency, and being not conducive to ensuring product quality. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rotary valve plunger pump with a simple structure, low processing difficulty, which is conducive to preventing crystallization, prolonging the maintenance cycle, and improving production efficiency.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A rotary valve plunger pump includes a pump body assembly and a metering rod passing through the lower end of the pump body assembly. A cleaning outlet and an anti-crystallization inlet are arranged on the outer side of the lower end of the pump body assembly. A first groove is arranged on the inner wall of the lower end of the pump body assembly. The cleaning outlet and the anti-crystallization inlet are both communicated with the first groove. A second groove is arranged on the outer wall of the metering rod. A third groove is arranged on the inner wall of the upper end of the pump body assembly. The second groove can communicate the third groove with the first groove.

[0006] As a further improvement of the above technical solution: both the anti-crystallization inlet and the cleaning outlet are communicated with the lower end of the first groove.

[0007] As a further improvement of the above technical solution: both the anti-crystallization inlet and the cleaning outlet are arranged obliquely downward.

[0008] As a further improvement of the above technical solution: a rotary valve rod passes through the upper end of the pump body assembly. A filling cavity is formed between the rotary valve rod and the metering rod. A cleaning inlet is arranged on the outer side of the upper end of the pump body assembly, and a filling inlet and a filling outlet are arranged on the outer side of the middle part. The filling inlet and the filling outlet are both communicated with the filling cavity. The cleaning inlet is communicated with the third groove.

[0009] As a further improvement of the above technical solution: a fourth groove is provided below the third groove, the outer diameter of the rotary valve rod is smaller than the inner diameter of the third groove, the inner diameter of the fourth groove is smaller than the inner diameter of the third groove, the filling cavity is located inside the fourth groove, and the outer diameter of the metering rod is smaller than the inner diameter of the fourth groove.

[0010] As a further improvement of the above technical solution: during filling, the lower end of the rotary valve rod is in sealing fit with the fourth groove, and the portions of the outer wall of the metering rod above and below the second groove are both in sealing fit with the inner wall of the pump body assembly.

[0011] As a further improvement of the above technical solution: during cleaning and sterilization, the lower end of the rotary valve rod is located in the third groove, the upper end of the metering rod is located in the fourth groove and the lower end is in sealing fit with the inner wall of the pump body assembly, and there is a gap between the second groove and the inner wall of the pump body assembly.

[0012] As a further improvement of the above technical solution: an L-shaped valve rod flow channel is provided at the lower end of the rotary valve rod.

[0013] As a further improvement of the above technical solution: both the rotary valve rod and the metering rod are ceramic rods.

[0014] As a further improvement of the above technical solution: the pump body assembly includes a metal shell and a ceramic pump body provided inside the metal shell, the cleaning outlet and the anti-crystallization inlet are provided on the metal shell, and the metering rod passes through the ceramic pump body.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: for the rotary valve plunger pump disclosed by the present utility model, a cleaning outlet and an anti-crystallization inlet are provided on the outer side of the lower end of the pump body assembly and are communicated with the first groove on the lower end inner wall. During filling, an anti-crystallization buffer agent can be continuously added through the anti-crystallization inlet. The anti-crystallization buffer agent enters the cavity formed by the first groove and the second groove, and finally flows out from the cleaning outlet. During the continuous flowing process, the solute concentration of the liquid medicine inside the pump can be effectively controlled, the PH value of the solvent can be stabilized, the pump body assembly, the metering rod and the corresponding interfaces can be continuously cleaned, and the contact between the liquid medicine solvent and the air can be blocked, so as to achieve the purpose of anti-crystallization, thereby prolonging the maintenance period and improving the production efficiency; during cleaning and sterilization, the second groove on the outer wall of the metering rod communicates the third groove at the upper end of the pump body assembly with the first groove at the lower end, so that the cleaning and sterilization medium can flow out from the cleaning outlet, that is, the anti-crystallization buffer agent and the cleaning and sterilization medium can share the cleaning outlet, which can reduce the number of interfaces on the pump body assembly, simplify the structure, and only the first groove needs to be processed on the inner wall of the lower end of the pump body assembly, which is beneficial to reducing the processing difficulty and manufacturing cost.

[0016] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0017] Figure 1 is a perspective structural view of the rotary valve plunger pump of the present utility model.

[0018] Figure 2 is a sectional structural view of the metering rod of the present utility model at the initial filling position.

[0019] Figure 3 is a sectional structural view of the metering rod of the present utility model at the end filling position.

[0020] Figure 4 is a sectional structural view of the present utility model in the cleaning and sterilization state.

[0021] Each label in the figure represents:

[0022] 1. Pump body assembly; 11. First groove; 12. Third groove; 13. Fourth groove; 14. Metal shell; 15. Ceramic pump body; 2. Rotary valve rod; 21. Valve rod flow channel; 3. Metering rod; 31. Second groove; 4. Filling cavity; 51. Filling inlet; 52. Filling outlet; 53. Cleaning inlet; 54. Cleaning outlet; 55. Anti-crystallization inlet. Detailed Description of the Preferred Embodiment

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0025] In the present utility model, unless otherwise clearly defined and limited, terms such as "assembly", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0027] Figures 1 to 4 An embodiment of the rotary valve plunger pump of the present utility model is shown. The rotary valve plunger pump of this embodiment includes a pump body assembly 1 and a metering rod 3 passing through the lower end of the pump body assembly 1. A cleaning outlet 54 and an anti-crystallization inlet 55 are provided on the outer side of the lower end of the pump body assembly 1. A first groove 11 is provided on the inner wall of the lower end of the pump body assembly 1. Both the cleaning outlet 54 and the anti-crystallization inlet 55 communicate with the first groove 11. A second groove 31 is provided on the outer wall of the metering rod 3. A third groove 12 is provided on the inner wall of the upper end of the pump body assembly 1. The second groove 31 can communicate the third groove 12 with the first groove 11.

[0028] In the rotary valve plunger pump of this embodiment, a cleaning outlet 54 and an anti-crystallization inlet 55 are provided on the outer side of the lower end of the pump body assembly 1 and communicate with the first groove 11 on the inner wall of the lower end. During filling, an anti-crystallization buffer (such as pure water or other acid-base buffers) can be continuously added through the anti-crystallization inlet 55. The anti-crystallization buffer enters the cavity formed by the first groove 11 and the second groove 31 and finally flows out from the cleaning outlet 54. During the continuous flow process, the solute concentration of the liquid medicine inside the pump can be effectively controlled, the pH value of the solvent can be stabilized, the pump body assembly 1, the metering rod 3, the cleaning outlet 54 and the anti-crystallization inlet 55 can be continuously cleaned, and the contact between the liquid medicine solvent and air can be blocked, achieving the purpose of anti-crystallization, thereby extending the maintenance cycle and improving production efficiency; during cleaning and sterilization, the second groove 31 on the outer wall of the metering rod 3 communicates the third groove 12 at the upper end of the pump body assembly 1 with the first groove 11 at the lower end, so that the cleaning and sterilization medium can flow out from the cleaning outlet 54, that is, the anti-crystallization buffer and the cleaning and sterilization medium can share the cleaning outlet 54, which can reduce the number of interfaces on the pump body assembly 1, simplify the structure, and only the first groove 11 needs to be processed on the inner wall of the lower end of the pump body assembly 1, which is beneficial to reducing the processing difficulty (processing a groove on the outer wall of the metering rod 3 is easier than processing a groove on the inner wall of the pump body assembly 1) and reducing the manufacturing cost.

[0029] Further, in this embodiment, the anti-crystallization inlet 55 and the cleaning outlet 54 are both communicated with the lower end of the first groove 11. Specifically referring to Fig. 4, during cleaning and sterilization, the cleaning and sterilization medium can all flow out from the cleaning outlet 54, avoiding remaining below the cleaning outlet 54 and causing inability to discharge. The structure is reasonable and effective.

[0030] Further, in this embodiment, the anti-crystallization inlet 55 and the cleaning outlet 54 are both arranged obliquely downward. The cleaning outlet 54 being arranged obliquely downward is conducive to the discharge of the anti-crystallization buffer and the cleaning and sterilization medium; the anti-crystallization inlet 55 being arranged obliquely downward enables the anti-crystallization buffer to enter obliquely upward into the cavity formed by the first groove 11 and the second groove 31, generating a certain scouring effect on the liquid medicine adhering to the metering rod 3.

[0031] Further, in this embodiment, a rotary valve rod 2 penetrates through the upper end of the pump body assembly 1. A filling cavity 4 is formed between the rotary valve rod 2 and the metering rod 3. A cleaning inlet 53 is provided on the outer side of the upper end of the pump body assembly 1, and a filling inlet 51 and a filling outlet 52 are provided on the outer side of the middle part. The filling inlet 51 and the filling outlet 52 are both communicated with the filling cavity 4, and the cleaning inlet 53 is communicated with the third groove 12. Preferably, the filling inlet 51, the filling outlet 52 and the cleaning inlet 53 are all arranged horizontally, and the filling inlet 51 and the filling outlet 52 are arranged oppositely, or in other words, the included angle is 180°.

[0032] Further, in this embodiment, a fourth groove 13 is provided below the third groove 12. The outer diameter of the rotary valve rod 2 is smaller than the inner diameter of the third groove 12, and the inner diameter of the fourth groove 13 is smaller than the inner diameter of the third groove 12, so that the lower end of the rotary valve rod 2 can be in sealing fit with the fourth groove 13. The filling cavity 4 is located inside the fourth groove 13. The outer diameter of the metering rod 3 is smaller than the inner diameter of the fourth groove 13, so that a gap can be generated on the outer circumference of the metering rod 3 for the cleaning and sterilization medium to flow downward and be discharged through this gap.

[0033] In this embodiment, during filling, the lower end of the rotary valve rod 2 is in sealing fit with the fourth groove 13, and the parts of the outer wall of the metering rod 3 above and below the second groove 31 are both in sealing fit with the inner wall of the pump body assembly 1, so that both upper and lower ends of the filling cavity 4 can be kept sealed during the filling process, avoiding leakage of the liquid medicine. Specifically referring to Figure 2 and Figure 3 , during filling, the metering rod 3 descends, and the liquid medicine enters the filling cavity 4 through the filling inlet 51 and the rotary valve rod 2 (specifically, the valve rod flow channel 21 at the lower end of the rotary valve rod 2). After the metering rod 3 descends to the set position, it rises, and the rotary valve rod 2 rotates 180° to make the valve rod flow channel 21 dock with the filling outlet 52. The liquid medicine in the filling cavity 4 flows out through the rotary valve rod 2 and the filling outlet 52 under the action of the metering rod 3. After the metering rod 3 rises to the initial position, the rotary valve rod 2 rotates 180° again to dock with the filling inlet 51, and so on in a cycle.

[0034] In this embodiment, during cleaning and sterilization, the lower end of the rotary valve rod 2 is located in the third groove 12, the upper end of the metering rod 3 is located in the fourth groove 13 and the lower end is in sealing cooperation with the inner wall of the pump body assembly 1, which can prevent the leakage of cleaning and sterilization media. There is a gap between the second groove 31 and the inner wall of the pump body assembly 1. For details, see Figure 4 , during cleaning and sterilization, the cleaning and sterilization media enter from the cleaning inlet 53, and then flow successively through the gap between the third groove 12 and the rotary valve rod 2, the filling cavity 4, the gap between the upper end of the metering rod 3 and the fourth groove 13, the gap between the second groove 31 and the inner wall of the pump body assembly 1, and the gap between the first groove 11 and the metering rod 3, and finally discharge from the cleaning outlet 54, achieving the purpose of comprehensive cleaning and sterilization.

[0035] As a preferred embodiment, the lower end of the rotary valve rod 2 is provided with an L-shaped valve rod flow channel 21. The filling cavity 4 can be conveniently communicated with the filling inlet 51 and the filling outlet 52 through the L-shaped valve rod flow channel 21, and the structure is simple and effective.

[0036] As a preferred embodiment, both the rotary valve rod 2 and the metering rod 3 are ceramic rods. The rotary valve rod 2 and the metering rod 3 are made of ceramic materials, which have high hardness, good wear resistance, corrosion resistance and high temperature resistance.

[0037] As a preferred embodiment, the pump body assembly 1 includes a metal shell 14 and a ceramic pump body 15 arranged inside the metal shell 14. The cleaning outlet 54 and the anti-crystallization inlet 55 are arranged on the metal shell 14. Of course, the filling inlet 51, the filling outlet 52 and the cleaning inlet 53 are also arranged on the metal shell 14. The metering rod 3 passes through the ceramic pump body 15, and of course, the rotary valve rod 2 also passes through the ceramic pump body 15. The ceramic pump body 15 has high hardness, good wear resistance, corrosion resistance and high temperature resistance, while the metal shell 14 does not contact the liquid medicine, cleaning and sterilization media, anti-crystallization buffer agent, etc. Therefore, there is no need to use a ceramic pump body 15, which is beneficial to further reducing the processing difficulty and cost, and at the same time can provide good protection for the ceramic pump body 15.

[0038] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the above-disclosed technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A rotary valve plunger pump, comprising a pump body assembly (1) and a metering rod (3) penetrating the lower end of the pump body assembly (1), characterized in that: The outer side of the lower end of the pump body assembly (1) is provided with a cleaning outlet (54) and an anti-crystallization inlet (55); the inner wall of the lower end of the pump body assembly (1) is provided with a first groove (11); the cleaning outlet (54) and the anti-crystallization inlet (55) are both connected to the first groove (11); the outer wall of the metering rod (3) is provided with a second groove (31); the inner wall of the upper end of the pump body assembly (1) is provided with a third groove (12); the second groove (31) can connect the third groove (12) with the first groove (11).

2. The rotary valve plunger pump according to claim 1, characterized in that: The anti-crystallization inlet (55) and the cleaning outlet (54) are both in communication with the lower end of the first groove (11).

3. The rotary valve plunger pump according to claim 1, characterized in that: The anti-crystallization inlet (55) and the cleaning outlet (54) are both arranged obliquely downward.

4. The rotary valve plunger pump according to any one of claims 1 to 3, characterized in that: A rotary valve rod (2) is passed through the upper end of the pump body assembly (1), and a filling chamber (4) is formed between the rotary valve rod (2) and the metering rod (3). A cleaning inlet (53) is provided on the outer side of the upper end of the pump body assembly (1), and a filling inlet (51) and a filling outlet (52) are provided on the outer side of the middle part. Both the filling inlet (51) and the filling outlet (52) are communicated with the filling chamber (4), and the cleaning inlet (53) is communicated with the third groove (12).

5. The rotary valve plunger pump according to claim 4, characterized in that: A fourth groove (13) is provided below the third groove (12); the outer diameter of the rotary valve stem (2) is smaller than the inner diameter of the third groove (12); the inner diameter of the fourth groove (13) is smaller than the inner diameter of the third groove (12); the filling cavity (4) is located inside the fourth groove (13); and the outer diameter of the metering rod (3) is smaller than the inner diameter of the fourth groove (13).

6. The rotary valve plunger pump according to claim 5, characterized in that: During filling, the lower end of the rotary valve stem (2) is sealed with the fourth groove (13), and the outer wall of the metering rod (3) above and below the second groove (31) are sealed with the inner wall of the pump body assembly (1).

7. The rotary valve plunger pump according to claim 5, characterized in that: During cleaning and sterilization, the lower end of the rotary valve stem (2) is located in the third groove (12), the upper end of the metering rod (3) is located in the fourth groove (13) and the lower end is sealed with the inner wall of the pump body assembly (1), and there is a gap between the second groove (31) and the inner wall of the pump body assembly (1).

8. The rotary valve plunger pump according to claim 4, characterized in that: An L-shaped valve stem flow channel (21) is provided at the lower end of the rotary valve stem (2).

9. The rotary valve plunger pump according to claim 4, characterized in that: The rotary valve rod (2) and the metering rod (3) are both ceramic rods.

10. The rotary valve plunger pump according to any one of claims 1 to 3, characterized in that: The pump body assembly (1) comprises a metal shell (14) and a ceramic pump body (15) arranged on the inner side of the metal shell (14); the cleaning outlet (54) and the anti-crystallization inlet (55) are arranged on the metal shell (14); and the metering rod (3) is inserted into the ceramic pump body (15).

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