Ceramic plunger pump sterilizable in-line

Abstract

The utility model discloses a kind of ceramic plunger pumps of online cleaning sterilization, rotary valve core, metering rod are respectively inserted into the central through hole of pump sleeve from both ends, it is sequentially provided with one step hole, two step holes, three step holes, four step holes, five step holes in pump sleeve;Valve core body of rotary valve core is sequentially provided with first rod section, second rod section, third rod section, fourth rod section;The rod body of metering rod is sequentially provided with upper thick rod section, middle thin rod section, lower thick rod section, and lower thick rod section outer periphery is provided with sealing element two.The utility model sets up the sealing structure between metering rod and pump sleeve to ceramic rod body of metering rod when cleaning sterilization, when filling, follow metering rod and move out from pump sleeve, again follow metering rod and enter into pump sleeve and carry out sealing when cleaning sterilization, simplify the design of step hole in pump sleeve, reduce the processing difficulty of pump sleeve, also be conducive to improving the coaxiality of each step hole, filling efficiency is higher, and economy is higher.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, and in particular to a ceramic plunger pump that can be cleaned and sterilized online. Background Technology

[0002] Ceramic plunger pumps are widely used in filling equipment in fields including pharmaceuticals, environmental engineering, petroleum, and chemicals due to their high-precision fluid metering control and strong corrosion resistance.

[0003] To prevent residual filling liquid in the working chamber, pump rod, metering rod, etc. of the ceramic plunger pump from contaminating or affecting the quality of the next filling, the plunger pump must be thoroughly cleaned and sterilized after each filling.

[0004] Chinese invention patent 201710261479.8 discloses a ceramic pump that can be cleaned and sterilized online. It uses different diameter parts to cooperate with the stepped hole in the center of the ceramic core to complete cleaning and sterilization or filling of medicine, thus realizing online cleaning and sterilization. Referring to the specification and accompanying drawings of this application, the ceramic pump has a sealing groove on the metal rod support of the ceramic rod used for metering, and a sealing ring is provided in the sealing groove. The sealing ring is used to seal between the ceramic core and the ceramic rod during cleaning and sterilization. This sealing method of setting the sealing ring on the rod support of the ceramic rod has the following problems: (1) Since the outer diameter of the rod support is larger than the outer diameter of the ceramic rod body, a stepped hole needs to be opened on the ceramic core to match the rod support. This not only increases the processing difficulty and processing cost of the ceramic core, but also makes it difficult to ensure coaxiality; (2) Since the metal rod support of the ceramic rod and the ceramic core are made of different materials, the two do not fit tightly when the rod support and the ceramic core are matched. The fit between the two does not play a very effective guiding role. When the ceramic rod moves up and down, it may still deviate or tilt, which not only affects the filling efficiency, but also easily leads to damage to the ceramic material.

[0005] Chinese invention patent 201911204861.0 discloses a plunger-type online sterilization ceramic pump, which utilizes different diameter sections to cooperate with a stepped hole in the center of the ceramic core to complete cleaning and sterilization or liquid filling, enabling online sterilization without disassembly. Referring to the specification and accompanying drawings of this application, the plunger-type ceramic pump has a sealing groove in the lower inner part of the ceramic sleeve of the pump body. A second sealing ring is installed in the sealing groove to seal between the ceramic sleeve and the moving piston. This sealing method, which places the sealing ring inside the ceramic sleeve, has at least the following problems: Because the sealing ring is embedded in the sealing groove of the ceramic sleeve, it remains in contact with the moving piston during both normal filling and cleaning / sterilization. On the one hand, when the moving piston moves axially up and down for liquid filling, the compression of the sealing ring will affect the up and down movement of the moving piston. The high resistance required necessitates a greater driving force to propel the moving piston, resulting in significant energy consumption. Even with increased driving force, the moving piston remains slow or even unable to move, leading to time-consuming, labor-intensive, and inefficient filling processes. Furthermore, during liquid filling, the moving piston's high-speed, reciprocating motion (approximately 60 times per minute) continuously rubs against the sealing ring, causing it to quickly deteriorate, shorten its lifespan, and require frequent replacement. This not only incurs high maintenance costs but also negatively impacts efficiency and damages the ceramic material, resulting in low economic viability. Utility Model Content

[0006] To address the aforementioned shortcomings of existing online sterilization ceramic pumps, the applicant provides a structurally sound ceramic plunger pump capable of online cleaning and sterilization. The sealing ring is fitted onto the lower, thicker section of the metering ceramic rod. During filling, the sealing ring remains outside the pump sleeve along with the lower, thicker section of the metering rod, preventing obstruction of the metering rod's movement and avoiding damage to the sealing ring due to friction. This reduces energy consumption, resulting in high filling efficiency and high economic benefits.

[0007] The technical solution adopted in this utility model is as follows: A ceramic plunger pump capable of online cleaning and sterilization, wherein a rotating valve core and a metering rod are respectively inserted into the central through hole of the pump sleeve from both ends. The pump sleeve is provided with a first-order hole, a second-order hole, a third-order hole, a fourth-order hole, and a fifth-order hole in sequence. The diameter of the first-order hole φ1 is equal to the diameter of the third-order hole φ3. The valve core body of the rotating valve core is provided with a first rod section, a second rod section, a third rod section, and a fourth rod section in sequence. The rod diameter d2 of the second rod section is equal to the rod diameter d4 of the fourth rod section. The metering rod body is provided with an upper thick rod section, a middle thin rod section, and a lower thick rod section in sequence. The rod diameter D1 of the upper thick rod section is equal to the rod diameter D3 of the lower thick rod section. A sealing element 2 is provided on the outer periphery of the lower thick rod section. The rotating valve core is inserted into the pump sleeve from one end of the first-stage hole. The diameters of the second and fourth rod sections of the valve core body match the diameters of the first and third-stage holes of the pump sleeve. During filling, the fourth rod section engages with the third-stage hole. During cleaning and sterilization, the second rod section engages with the first-stage hole. The metering rod is inserted into the pump sleeve from one end of the fifth-order hole. The diameters of the upper and lower thicker sections of the rod match the diameter of the fifth-order hole in the pump sleeve. During filling, the upper thicker section mates with the fifth-order hole, while the lower thicker section and its second seal are moved out of the pump sleeve. During cleaning and sterilization, the lower thicker section moves into the pump sleeve and mates with the fifth-order hole, and the second seal on the lower thicker section seals the space between the lower thicker section and the fifth-order hole.

[0008] As a further improvement to the above technical solution: The pump sleeve has a filling liquid inlet, a filling liquid outlet, a cleaning and sterilization liquid inlet, and a cleaning and sterilization liquid outlet. The filling liquid inlet and the filling liquid outlet are connected to a third-order hole and located on opposite sides of the third-order hole. The cleaning and sterilization liquid inlet is connected to a second-order hole, and the cleaning and sterilization liquid outlet is connected to a fifth-order hole. A liquid guiding channel is provided at the bottom of the fourth rod section of the rotating valve core.

[0009] The diameter φ2 of the second-order hole in the pump sleeve is larger than the diameters of the first-order and third-order holes; the diameter φ3 of the fourth-order hole is larger than the diameter φ3 of the third-order hole but smaller than the diameter φ2 of the second-order hole; and the diameter φ5 of the fifth-order hole is smaller than the diameter φ3 of the third-order hole. The diameters d1 and d3 of the first and third rod sections of the valve core body of the rotating valve core are smaller than the diameter d2 of the second rod section. The diameter D2 of the thinner section of the metering rod body is smaller than the diameters of the thicker upper and lower rod sections.

[0010] The length of the fourth rod segment of the rotating valve core is greater than the length of the third-order hole of the pump sleeve, and the sum of the lengths of the second, third, and fourth rod segments is greater than the length of the second-order hole.

[0011] The length of the thinner section of the measuring rod is less than the length of the fifth-order hole.

[0012] The length of the thicker section of the metering rod is less than the sum of the lengths of the third-order and fourth-order holes. The length of the thinner section is greater than or equal to the distance from the bottom side of the cleaning and sterilizing liquid outlet to the top of the fifth-order hole. The distance from the top side of the seal on the metering rod to the top of the thinner section is greater than the distance from the bottom side of the cleaning and sterilizing liquid outlet to the top of the fifth-order hole.

[0013] The combined length of the third and fourth rod sections of the rotating valve core is greater than or equal to the distance from the top side of the cleaning and sterilization liquid inlet to the bottom of the second-stage orifice.

[0014] A seal is installed in the first-stage hole of the pump sleeve. The combined length of the third and fourth rod segments of the rotating valve core is less than the distance from the bottom side of the seal to the bottom of the second-stage hole.

[0015] A sealing groove is provided on the outer wall surface of the lower thick section of the measuring rod, and the second sealing element is set in the sealing groove.

[0016] The pump sleeve is fitted with an outer sleeve. On the outer sleeve, a filling inlet is provided corresponding to the filling liquid inlet, a filling outlet is provided corresponding to the filling liquid outlet, a cleaning and sterilization inlet is provided corresponding to the cleaning and sterilization liquid inlet, and a cleaning and sterilization outlet is provided corresponding to the cleaning and sterilization liquid outlet. A valve core handle is fitted on the upper end of the first rod section of the rotating valve core body. A rod handle is fitted on the lower end of the lower thicker rod section of the metering rod body.

[0017] The beneficial effects of this utility model are as follows: This utility model sets the sealing structure between the metering rod and the pump sleeve during cleaning and sterilization on the ceramic rod body of the metering rod. During filling, it moves out of the pump sleeve along with the metering rod, and during cleaning and sterilization, it enters the pump sleeve again along with the metering rod for sealing. This structure has at least the following advantages: (1) By setting the sealing element on the ceramic metering rod body, the upper and lower thick sections of the metering rod body are set with the same rod diameter. The upper and lower thick sections can be matched with the same stepped hole (five-stage hole) at the same time, without the need to set stepped holes with different diameters for different rod sections. This simplifies the design of the stepped holes in the pump sleeve, reduces the processing difficulty of the pump sleeve, and also helps to improve the coaxiality of each stepped hole, ensuring that the pump rod and the metering rod maintain the center of the sliding; (2) The sealing element is set on the lower thick rod of the ceramic metering rod body. On the upper section, the metering rod moves into the pump sleeve to play a sealing role only during cleaning and sterilization. During the filling process, the metering rod slides up and down with the pump sleeve to achieve liquid inlet and outlet. The lower section of the metering rod moves out of the pump sleeve with the seal and will not enter the pump sleeve during the entire filling process. The metering rod will not be subjected to the resistance of the seal during the up and down reciprocating motion. The metering rod can move quickly under the action of lower driving force, resulting in lower energy consumption and higher filling efficiency. (3) Since the seal on the metering rod moves out of the pump sleeve with the lower section during the filling process, the up and down reciprocating motion of the metering rod will not repeatedly rub the seal. The service life of the seal is longer, the sealing is more reliable, the maintenance cost is reduced, the filling efficiency is improved, and the economy is higher. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the pump body of this utility model.

[0019] Figure 2 This is a cross-sectional view of the pump rod of this utility model.

[0020] Figure 3 This is a cross-sectional view of the measuring rod of this utility model.

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0022] Figure 5 This is a schematic diagram of the present invention in the filling state, at which time the metering rod moves down to the low position and the liquid enters the pump.

[0023] Figure 6 This is a schematic diagram of the present invention in the filling state, at which time the metering rod moves up to the high position and the liquid is discharged from the pump.

[0024] Figure 7 This is a schematic diagram of the present invention in the cleaning and sterilization state.

[0025] In the picture: 1. Pump body; 11. Outer casing; 12. Pump sleeve; 121. First-stage hole; 1211. Sealing groove one; 122. Second-stage hole; 123. Third-stage hole; 124. Fourth-stage hole; 125. Fifth-stage hole; 126. Filling liquid inlet; 127. Filling liquid outlet; 128. Cleaning and sterilization liquid inlet; 129. Cleaning and sterilization liquid outlet; 13. Filling inlet nozzle; 14. Filling outlet nozzle; 15. Cleaning and sterilization inlet nozzle; 16. Cleaning and sterilization outlet nozzle; 2. Rotate the valve core; 21. Valve core body; 211. First rod section; 212. Second rod section; 213. Third rod section; 214. Fourth rod section; 215. Liquid guiding channel; 22. Valve core handle; 3. Measuring rod; 31. Rod body; 311. Upper thick rod section; 312. Middle and thin rod section; 313. Lower thick rod section; 3131. Sealing groove two; 32. Rod handle; 4. Seal Component 1; 5. Seal Component 2. Detailed Implementation

[0026] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0027] like Figures 1 to 7 As shown, this utility model includes a pump body 1, a rotating valve core 2, and a metering rod 3. The rotating valve core 2 and the metering rod 3 are respectively inserted into the central hole of the pump body 1 from the upper and lower ends. The rotating valve core 2 and the metering rod 3 can reciprocate within the central hole of the pump body 1.

[0028] like Figure 1As shown, the pump body 1 includes a metal outer sleeve 11 and a ceramic pump sleeve 12. The outer sleeve 11 is fixedly fitted onto the outside of the pump sleeve 12, and the pump sleeve 12 has a through central hole. The central hole of the pump sleeve 12 is a stepped hole, with a first-order hole 121, a second-order hole 122, a third-order hole 123, a fourth-order hole 124, and a fifth-order hole 125 arranged sequentially from top to bottom. A chamfer is provided between adjacent holes. The diameter φ1 of the first-order hole 121 is equal to the diameter φ3 of the third-order hole 123. The diameter φ2 of the second-order hole 122 is larger than the diameters of the first-order hole 121 and the third-order hole 123. The diameter φ3 of the fourth-order hole 124 is larger than the diameter φ3 of the third-order hole 123 but smaller than the diameter φ2 of the second-order hole 122. The diameter φ5 of the fifth-order hole 125 is smaller than the diameter φ3 of the third-order hole 123. A sealing groove 1211 is formed on the inner wall of the first-order hole 121, and a sealing element 4 is installed in the sealing groove 1211. A filling liquid inlet 126, a filling liquid outlet 127, a cleaning and sterilization liquid inlet 128, and a cleaning and sterilization liquid outlet 129 are formed on the wall of the pump sleeve 12. The filling liquid inlet 126 and the filling liquid outlet 127 are connected to the middle of the third-order hole 123 and are located on opposite sides of the third-order hole 123. The central axes of the filling liquid inlet 126 and the filling liquid outlet 127 are on the same plane. The cleaning and sterilization liquid inlet 128 is connected to the upper end of the second-order hole 122, and the cleaning and sterilization liquid outlet 129 is connected to the middle of the fifth-order hole 125. On the outer casing 11, a filling inlet nozzle 13 is provided corresponding to the filling liquid inlet 126, a filling outlet nozzle 14 is provided corresponding to the filling liquid outlet 127, a cleaning and sterilization inlet nozzle 15 is provided corresponding to the cleaning and sterilization liquid inlet 128, and a cleaning and sterilization outlet nozzle 16 is provided corresponding to the cleaning and sterilization liquid outlet 129.

[0029] like Figure 2 As shown, the rotating valve core 2 includes a ceramic valve core body 21 and a metal valve core handle 22. The valve core body 21 is a stepped rod, with a first rod segment 211, a second rod segment 212, a third rod segment 213, and a fourth rod segment 214 arranged sequentially from top to bottom. A chamfer is provided between adjacent rod segments. The valve core handle 22 is fitted onto the upper end of the first rod segment 211, and a liquid guiding channel 215 is opened at the bottom end of the fourth rod segment 214. The rod diameter d1 of the first rod segment 211 and the rod diameter d3 of the third rod segment 213 are smaller than the rod diameter d2 of the second rod segment 212, while the rod diameter d2 of the second rod segment 212 is equal to the rod diameter d4 of the fourth rod segment 214.

[0030] like Figure 3 , Figure 4As shown, the measuring rod 3 includes a ceramic rod body 31 and a metal handle 32. The rod body 31 is a stepped rod, consisting of an upper thicker section 311, a middle thinner section 312, and a lower thicker section 313 arranged sequentially from top to bottom. A chamfer is provided between adjacent sections. The handle 32 is fitted onto the lower end of the lower thicker section 313. The diameter D1 of the upper thicker section 311 and the diameter D3 of the lower thicker section 313 are equal, while the diameter D2 of the middle thinner section 312 is smaller than the diameters of the upper thicker section 311 and the lower thicker section 313. A sealing groove 3131 is formed on the upper outer wall of the lower thicker section 313, and a sealing element 5 is installed within the sealing groove 3131.

[0031] like Figures 5 to 7 As shown, the rotating valve core 2 is rotatably inserted into the upper part of the pump sleeve 12, allowing it to move up and down. The diameters of the second rod segment 212 and the fourth rod segment 214 of the valve core body 21 match the diameters of the first-order hole 121 and the third-order hole 123 of the pump sleeve 12. During filling, the fourth rod segment 214 engages with the third-order hole 123. During cleaning and sterilization, the second rod segment 212 engages with the first-order hole 121, and the sealing element 4 seals the space between the second rod segment 212 and the first-order hole 121. The length of the fourth rod segment 214 is greater than the length of the third-order hole 123. The sum of the lengths of the second rod segment 212, the third rod segment 213, and the fourth rod segment 214 is greater than the length of the second-order hole 122. When the rotating valve core 2 switches from the filling state to the sterilization and cleaning state, the second rod segment 212 begins to enter the first-order hole 121 before the fourth rod segment 214 disengages from the third-order hole 123. This ensures that the rotating valve core 2 always slides in the center under the guidance of the pump sleeve 12, preventing the rotating valve core 2 from tilting. The sum of the lengths of the third segment 213 and the fourth segment 214 is greater than or equal to the distance from the top side of the cleaning and sterilization liquid inlet 128 to the bottom of the second-stage hole 122. The sum of the lengths of the third segment 213 and the fourth segment 214 is less than the distance from the bottom side of the sealing element 4 to the bottom of the second-stage hole 122. This ensures that the cleaning and sterilization liquid inlet 128 is open and the sealing is guaranteed during sterilization and cleaning, while also ensuring sufficient cleaning and sterilization space to guarantee the cleaning and sterilization effect.

[0032] like Figures 5 to 7As shown, the metering rod 3 is inserted into the lower part of the pump sleeve 12, allowing it to move up and down. The diameters of the upper thicker section 311 and the lower thicker section 313 of the rod body 31 match the diameter of the fifth-order hole 125 of the pump sleeve 12, with the diameter of the upper thicker section 311 being smaller than the diameter of the third-order hole 123. During filling, the upper thicker section 311 engages with the fifth-order hole 125; during cleaning and sterilization, the lower thicker section 313 engages with the fifth-order hole 125, and the sealing element 5 seals the space between the lower thicker section 313 and the fifth-order hole 125. The length of the thinner section 312 is less than the length of the fifth-order orifice 125. When the metering rod 3 switches from the filling state to the sterilization and cleaning state, the upper thicker section 311 begins to enter the fifth-order orifice 125 before the lower thicker section 313 disengages from the third-order orifice 123. This ensures that the metering rod 3 remains centered under the guidance of the pump sleeve 12, preventing the metering rod 3 from tilting. The length of the upper thicker section 311 is less than the sum of the lengths of the third-order orifice 123 and the fourth-order orifice 124. The length of the thinner section 312 is greater than or equal to the distance from the bottom of the cleaning and sterilization liquid outlet 129 to the top of the fifth-order orifice 125. The distance from the top of the sealing element 2 5 to the top of the fifth-order orifice 125 is greater than the distance from the bottom of the cleaning and sterilization liquid outlet 129 to the top of the thinner section 312. This ensures that the cleaning and sterilization liquid inlet 128 is open, guaranteeing the seal during sterilization and cleaning, while also ensuring sufficient cleaning and sterilization space to guarantee the cleaning and sterilization effect.

[0033] In actual use, this utility model has two working states: filling and cleaning / sterilization. The valve core handle 22 of the rotating valve core 2 and the rod handle 32 of the metering rod 3 are respectively connected to the corresponding drive structure. (1) When filling, refer to Figure 5 , Figure 6 The rotating valve core 2 is pushed down to the position corresponding to the liquid guide channel 215 and the filling liquid inlet 126 and filling liquid outlet 127. It rotates between the filling liquid inlet 126 and the filling liquid outlet 127 to enter and exit the liquid. When entering the liquid, the liquid guide channel 215 opens the filling liquid inlet 126. When exiting the liquid, the liquid guide channel 215 opens the filling liquid outlet 127. The metering rod 3 moves up and down within the filling stroke to draw the liquid into and out of the pump chamber. When the metering rod 3 moves downward, the liquid is drawn into the pump chamber. When the metering rod 3 moves upward, the liquid is discharged from the pump chamber.

[0034] (2) When cleaning and sterilizing, refer to Figure 7The rotating valve core 2 is pulled upwards to the second rod section 212 inside the first-stage hole 121. The sealing element 4 abuts against the second rod section 212 to seal. The fourth rod section 214 is completely dislodged from the third-stage hole 123 inside the second-stage hole 122. The metering rod 3 is pushed upwards to the upper coarse rod section 311 inside the third-stage hole 123 and the fourth-stage hole 124, and dislodged from the fifth-stage hole 125. The lower coarse rod section 313 enters into the fifth-stage hole 125. The sealing element 5 abuts against the inner wall of the fifth-stage hole 125 to seal. At this time, an annular gap is formed between the rotating valve core 2, the metering rod 3 and the pump sleeve 12, connecting the cleaning and sterilization liquid inlet 128 and the cleaning and sterilization liquid outlet 129, forming a conductive cleaning and sterilization channel. The cleaning and sterilization liquid enters from the cleaning and sterilization liquid inlet 128, flows through the annular gap, and is discharged from the cleaning and sterilization liquid outlet 129, cleaning and sterilizing the inner wall of the pump sleeve 12, the rotating valve core 2 and the outer wall of the metering rod 3.

[0035] The above description is an explanation of the present utility model and not a limitation thereof. The present utility model can be modified in any form without departing from its spirit.

Claims

1. A ceramic plunger pump capable of online cleaning and sterilization, wherein a rotating valve core (2) and a metering rod (3) are respectively inserted from both ends into the central through hole of a pump sleeve (12), characterized in that: The pump sleeve (12) is provided with a first-order hole (121), a second-order hole (122), a third-order hole (123), a fourth-order hole (124), and a fifth-order hole (125) in sequence. The diameter φ1 of the first-order hole (121) is equal to the diameter φ3 of the third-order hole (123). The valve core body (21) of the rotating valve core (2) is provided with a first rod segment (211), a second rod segment (212), a third rod segment (213), and a fourth rod segment (215) in sequence. The diameter d2 of the second rod segment (212) is equal to the diameter d4 of the fourth rod segment (214); the upper thick rod segment (311), the middle thin rod segment (312), and the lower thick rod segment (313) are arranged sequentially on the rod body (31) of the metering rod (3). The diameter D1 of the upper thick rod segment (311) and the diameter D3 of the lower thick rod segment (313) are equal. A sealing element 2 (5) is provided on the outer periphery of the lower thick rod segment (313). The rotating valve core (2) is inserted into the pump sleeve (12) from one end of the first-stage hole (121). The diameters of the second rod section (212) and the fourth rod section (214) of the valve core body (21) match the diameters of the first-stage hole (121) and the third-stage hole (123) of the pump sleeve (12). During filling, the fourth rod section (214) engages with the third-stage hole (123). During cleaning and sterilization, the second rod section (212) engages with the first-stage hole (121). The metering rod (3) is inserted into the pump sleeve (12) from one end of the fifth-order hole (125). The diameter of the upper thick rod section (311) and the lower thick rod section (313) of the rod body (31) matches the diameter of the fifth-order hole (125) of the pump sleeve (12). During the filling operation, the upper thick rod section (311) is engaged with the fifth-order hole (125), and the lower thick rod section (313) and its sealing element II (5) are moved out and located outside the pump sleeve (12). During the cleaning and sterilization, the lower thick rod section (313) is moved into the pump sleeve (12) and engaged with the fifth-order hole (125). The sealing element II (5) on the lower thick rod section (313) seals the lower thick rod section (313) and the fifth-order hole (125).

2. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: The pump sleeve (12) is provided with a filling liquid inlet (126), a filling liquid outlet (127), a cleaning and sterilization liquid inlet (128), and a cleaning and sterilization liquid outlet (129). The filling liquid inlet (126) and the filling liquid outlet (127) are connected to the third-order hole (123) and are located on opposite sides of the third-order hole (123). The cleaning and sterilization liquid inlet (128) is connected to the second-order hole (122), and the cleaning and sterilization liquid outlet (129) is connected to the fifth-order hole (125). A liquid guiding channel (215) is provided at the bottom end of the fourth rod section (214) of the rotating valve core (2).

3. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: The diameter φ2 of the second-order hole (122) of the pump sleeve (12) is greater than that of the first-order hole (121) and the third-order hole (123). The diameter φ3 of the fourth-order hole (124) is greater than that of the third-order hole (123) and less than that of the second-order hole (122). The diameter φ5 of the fifth-order hole (125) is less than that of the third-order hole (123). The diameter d1 of the first rod section (211) and the diameter d3 of the third rod section (213) of the valve core body (21) of the rotating valve core (2) are less than that of the second rod section (212). The diameter D2 of the thinner rod section (312) of the rod body (31) of the metering rod (3) is less than that of the thicker upper rod section (311) and the thicker lower rod section (313).

4. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: The length of the fourth rod segment (214) of the rotating valve core (2) is greater than the length of the third-order hole (123) of the pump sleeve (12), and the combined length of the second rod segment (212), the third rod segment (213), and the fourth rod segment (214) is greater than the length of the second-order hole (122).

5. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: The length of the thin section (312) of the measuring rod (3) is less than the length of the fifth-order hole (125).

6. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1 or 2, characterized in that: The length of the upper thick section (311) of the metering rod (3) is less than the sum of the lengths of the third-order hole (123) and the fourth-order hole (124). The length of the middle and thin section (312) is greater than or equal to the distance from the bottom side of the cleaning and sterilizing liquid outlet (129) to the top of the fifth-order hole (125). The distance from the top side of the second seal (5) on the metering rod (3) to the top of the middle and thin section (312) is greater than the distance from the bottom side of the cleaning and sterilizing liquid outlet (129) to the top of the fifth-order hole (125).

7. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1 or 2, characterized in that: The combined length of the third rod segment (213) and the fourth rod segment (214) of the rotating valve core (2) is greater than or equal to the distance from the top side of the cleaning and sterilization liquid inlet (128) to the bottom of the second-order hole (122).

8. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1 or 2, characterized in that: A seal (4) is provided in the first-stage hole (121) of the pump sleeve (12). The combined length of the third rod segment (213) and the fourth rod segment (214) of the rotating valve core (2) is less than the distance from the bottom side of the seal (4) to the bottom of the second-stage hole (122).

9. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: A sealing groove is provided on the outer wall of the lower thick section (313) of the measuring rod (3), and the sealing element (5) is set in the sealing groove.

10. The ceramic plunger pump capable of online cleaning and sterilization according to claim 1, characterized in that: A jacket (11) is fitted on the pump sleeve (12). On the jacket (11), a filling inlet nozzle (13) is provided corresponding to the filling liquid inlet (126), a filling outlet nozzle (14) is provided corresponding to the filling liquid outlet (127), a cleaning and sterilization inlet nozzle (15) is provided corresponding to the cleaning and sterilization liquid inlet (128), and a cleaning and sterilization outlet nozzle (16) is provided corresponding to the cleaning and sterilization liquid outlet (129). A valve core handle (22) is fitted on the upper end of the first rod section (211) of the valve core body (21) of the rotating valve core (2). A rod handle (32) is fitted on the lower end of the lower thick rod section (313) of the rod body (31) of the metering rod (3).

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