Piston pump and process for the recycling of organofluorine intermediates

Abstract

The application belongs to the technical field of piston pumps, and specifically discloses a piston pump and a method for circulating organic fluorine intermediates, which comprises a shell and a controller, one side of the shell is provided with a motor, the surface of the shell is provided with an auxiliary assembly, and the inside of the shell is provided with a plugging cavity; the pressure in the driving cavity is controlled in real time by a hydraulic accumulator, so that the pressure is always higher than the suction pressure of the organic fluorine intermediate medium. The application also discloses a process for the piston pump. The positive pressure difference design fundamentally changes the state of the traditional structure driving cavity being low in pressure and easy to suck in the organic fluorine intermediate medium, effectively prevents the leakage of the organic fluorine intermediate medium with strong corrosion and strong penetration to the driving mechanism, and the detection area and the second hydraulic sensor arranged on the pump head can sensitively capture the pressure change caused by trace leakage, and stop and alarm immediately once the abnormality is found, so that the leakage accident is nipped in the bud, and the safety and reliability of the equipment operation are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of piston pump technology, and specifically discloses a piston pump and a method for recycling organic fluorine intermediates. Background Technology

[0002] In the field of organofluorine chemical production, especially in low-temperature chlorination reactions involving intermediates, there are extremely stringent requirements for the circulation and transportation of the reaction medium for organofluorine intermediates. Organofluorine compounds and their intermediates typically possess extremely strong chemical corrosivity and permeability, and the reaction process often needs to be carried out under low-temperature or even cryogenic conditions;

[0003] In the low-temperature chlorination reaction, the circulation of the organic fluorine intermediate medium is a key step to ensure the continuous and stable progress of the reaction. The circulation system needs to use a piston pump to extract the organic fluorine intermediate medium from the reactor, adjust the temperature through a heat exchanger, and then send it back to the reactor to achieve precise control of the reaction temperature and uniform mixing of the reactants.

[0004] Traditional piston pumps have many limitations when dealing with these organofluorine intermediate media. First, dynamic seals are prone to leakage due to the strong permeability of organofluorine intermediate media, which not only causes material loss but may also lead to safety accidents or environmental pollution. Second, under low-temperature conditions, the viscosity of traditional lubricating oil increases or even solidifies, which can cause drive components to jam and wear to accelerate, seriously affecting the operational stability and lifespan of the equipment.

[0005] Therefore, those skilled in the art have proposed a piston pump and an organofluorine intermediate recycling method to solve the problems mentioned above. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a piston pump and an organic fluorine intermediate circulation method to solve the problems of easy leakage and easy jamming of drive components in the prior art.

[0007] To achieve the above objectives, the present invention provides a piston pump, including a housing and a controller. A motor is disposed on one side of the housing, and auxiliary components are disposed on the surface of the housing. A sealing cavity is formed inside the housing, and an inlet cavity and an outlet cavity communicating with the sealing cavity are formed on the top of the housing. A second one-way valve communicating with the inlet cavity is fixedly connected to the top of the housing, and a first one-way valve communicating with the outlet cavity is fixedly connected to the top of the housing. A filter assembly is disposed inside the inlet cavity, and a drive assembly is disposed inside the housing. A mounting shell is disposed on the other side of the housing.

[0008] The drive assembly includes a drive cavity formed inside the housing and communicating with the sealing cavity. The drive cavity is located below the sealing cavity. A rotating block is rotatably connected to the inner wall of the drive cavity. A drive shaft is fixedly connected to the center of one side of the rotating block. The other end of the drive shaft passes through the housing and is fixedly connected to the output shaft of the motor. An mounting shaft is eccentrically fixedly connected to the other side of the rotating block. A sleeve is rotatably connected to the surface of the mounting shaft.

[0009] The drive cavity is filled with lubricating oil, which is perfluoropolyether oil.

[0010] In the above technical solution, preferably, a sealing block is rotatably connected inside the sealing cavity, a connecting channel penetrating the sealing block is opened inside the sealing block, a drive rod is fixedly connected to the surface of the sleeve, the other end of the drive rod passes through the connecting channel and is fixedly connected to a pump head, the pump head is slidably connected to the inner wall of the connecting channel, and a notch communicating with the connecting channel is opened on the surface of the sealing block, a third hydraulic sensor is fixedly connected to the inner wall of the notch.

[0011] In the above technical solution, preferably, the surface of the pump head is provided with a first sealing ring, a detection area and a second sealing ring from top to bottom, and a second hydraulic sensor is provided inside the detection area.

[0012] In the above technical solution, preferably, the auxiliary component includes a hydraulic accumulator and a first hydraulic sensor. The first hydraulic sensor is disposed inside the drive cavity. The hydraulic accumulator is disposed on one side of the outer shell. One end of the hydraulic accumulator is connected to a connecting pipe. The other end of the connecting pipe is connected to the drive cavity. A sampling tube is connected to the surface of the connecting pipe. The top of the sampling tube is detachably provided with a cap.

[0013] In the above technical solution, preferably, the filter assembly includes a connecting shell disposed inside the liquid inlet chamber, the connecting shell being fixedly connected to the inner wall of the liquid inlet chamber, the surface of the connecting shell having uniformly distributed filter holes, the inner top wall of the connecting shell being rotatably connected to a connecting shaft, and the lower end of the connecting shaft penetrating the connecting shell and being fixedly connected to an impeller.

[0014] In the above technical solution, preferably, two connecting plates are fixedly connected to the surface of the connecting shaft and are rotatably connected to the inner wall of the connecting shell. An mounting plate is fixedly connected between the two connecting plates. A slide rod is evenly distributed on one side of the mounting plate. One end of the slide rod passes through the mounting plate, and a dredging rod is fixedly connected to the other end of the slide rod. The dredging rod matches the adjacent filter hole, and the diameter of the dredging rod is smaller than the aperture of the filter hole.

[0015] In the above technical solution, preferably, the unblocking rod has two symmetrically distributed inclined surfaces on the side away from the sliding rod, and a spring is provided between the surface of the unblocking rod and the mounting plate. One end of the spring is fixedly connected to the surface of the unblocking rod, and the other end of the spring is fixedly connected to the surface of the mounting plate.

[0016] In the above technical solution, preferably, the surface of the outer shell is provided with an inlet pipe communicating with the liquid outlet chamber, the surface of the outer shell is provided with a discharge pipe communicating with the liquid inlet chamber, and a third one-way valve is provided inside both the inlet pipe and the discharge pipe.

[0017] This invention also discloses a method for recycling organofluorine intermediates, comprising the following steps:

[0018] S1. The motor is started to rotate forward by the controller. The motor drives the drive shaft and rotating block to rotate. Then, the rotational motion is converted into reciprocating linear motion of the drive rod and pump head in the connection channel of the sealing block through the mounting shaft and sleeve. When the pump head moves down, the notch of the sealing block is aligned with the liquid inlet chamber, and the organic fluorine intermediate medium is drawn in through the second one-way valve. When the pump head moves up, the notch is aligned with the liquid outlet chamber, and the organic fluorine intermediate medium is discharged through the first one-way valve, forming a directional circulation to provide a continuous flow of organic fluorine intermediate medium for the low-temperature chlorination reaction.

[0019] S2. During the circulation of the organofluorine intermediate medium, the drive chamber is filled with perfluoropolyether oil for lubrication. The first hydraulic sensor monitors the internal pressure of the drive chamber in real time, and the third hydraulic sensor monitors the suction pressure of the organofluorine intermediate medium at the notch. The controller receives the two pressure signals and compares them. Through the hydraulic accumulator and connecting pipe, the pressure in the drive chamber is automatically adjusted to ensure that it is always greater than the pressure of the organofluorine intermediate medium at the notch, forming a pressure barrier to prevent the organofluorine intermediate medium from leaking into the drive chamber through the gap between the pump head and the connecting channel.

[0020] S3. When the organic fluorine intermediate medium passes through the inlet chamber, it is filtered through the filter holes on the connecting shell to remove impurities. When the filter assembly needs to be cleaned, the controller switches the motor to reverse, and at the same time, the third one-way valve in the inlet and outlet pipes causes the cleaning organic fluorine intermediate medium to flow in reverse from the outlet chamber to the inlet chamber, backwashing the filter holes.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The pressure inside the drive chamber is regulated in real time by a hydraulic accumulator, ensuring it remains higher than the suction pressure of the organofluorine intermediate medium. This positive pressure differential design fundamentally changes the traditional structure where the drive chamber is low-pressure and prone to sucking in organofluorine intermediate media. It effectively prevents highly corrosive and permeable organofluorine intermediate media from leaking into the drive mechanism. A detection zone and a second hydraulic sensor are installed on the pump head, which can sensitively detect pressure changes caused by minute leaks. Once an abnormality is detected, the machine will immediately stop and alarm, nipping leaks in the bud and greatly improving the safety and reliability of the equipment.

[0023] The drive chamber is filled with perfluoropolyether oil as a lubricant. This lubricant is chemically inert and can withstand the corrosion of organic fluorine intermediate media. It can also maintain good fluidity at low temperatures, ensuring that the drive components can still operate smoothly and reduce wear under low-temperature chlorination reaction conditions, thus significantly extending the equipment life.

[0024] By simply reversing the motor, the reverse flow of the cleaning medium for organic fluorine intermediates can be achieved. The reverse flow not only flushes the filter pores but also drives the impeller to rotate, which in turn drives the unclogging rod to make a circular motion, automatically and one by one clearing the filter pores blocked by impurities, achieving deep cleaning of the filter assembly without disassembly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a partial explosion diagram of the present invention;

[0027] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0028] Figure 4 This is a schematic diagram showing the connection of the drive shaft, rotating block, mounting shaft, and drive rod of the present invention;

[0029] Figure 5 for Figure 4 Enlarged view of A in the middle;

[0030] Figure 6 This is a schematic diagram of the structure of the filter assembly of the present invention;

[0031] Figure 7 for Figure 6 A magnified view of B in the middle.

[0032] In the diagram: 1. Outer casing; 101. First check valve; 102. Second check valve; 103. Mounting housing; 104. Outlet chamber; 105. Inlet chamber; 2. Motor; 3. Auxiliary components; 301. Hydraulic accumulator; 302. Sampling tube; 303. Connecting tube; 304. Cover; 305. Drive chamber; 306. First hydraulic sensor; 4. Filter assembly; 401. Inlet tube; 402. Outlet tube; 403. Connecting housing; 404. Filter holes; 405. Connecting shaft; 406. 407. Connecting plate; 408. Mounting plate; 409. Impeller; 410. Inclined surface; 411. Unblocking rod; 412. Spring; 413. Slide rod; 5. Drive assembly; 501. Drive shaft; 502. Rotating block; 503. Mounting shaft; 504. Sleeve; 505. Sealing block; 506. Drive rod; 507. Pump head; 508. First sealing ring; 509. Detection area; 510. Second sealing ring; 511. Second hydraulic sensor; 512. Notch; 513. Third hydraulic sensor. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0035] like Figures 1-7 The piston pump shown includes a housing 1 and a controller. A motor 2 is provided on one side of the housing 1, and an auxiliary component 3 is provided on the surface of the housing 1. A sealing cavity is provided inside the housing 1. An inlet cavity 105 and an outlet cavity 104 connected to the sealing cavity are provided on the top of the housing 1. A second check valve 102 connected to the inlet cavity 105 is fixedly connected to the top of the housing 1. A first check valve 101 connected to the outlet cavity 104 is fixedly connected to the top of the housing 1. A filter component 4 is provided inside the inlet cavity 105. A drive component 5 is provided inside the housing 1. A mounting shell 103 is provided on the other side of the housing 1.

[0036] The drive assembly 5 includes a drive cavity 305 that is opened inside the housing 1 and communicates with the sealing cavity. The drive cavity 305 is located below the sealing cavity. A rotating block 502 is rotatably connected to the inner wall of the drive cavity 305. A drive shaft 501 is fixedly connected to the center of one side of the rotating block 502. The other end of the drive shaft 501 passes through the housing 1 and is fixedly connected to the output shaft of the motor 2. An mounting shaft 503 is eccentrically fixedly connected to the other side of the rotating block 502. A sleeve 504 is rotatably connected to the surface of the mounting shaft 503.

[0037] The interior of the drive cavity 305 is filled with lubricating oil, which is perfluoropolyether oil.

[0038] Specifically, starting the motor 2 can drive the drive shaft 501 to rotate, which in turn can drive the rotating block 502 to move synchronously, thereby driving the mounting shaft 503 to rotate around the circle of the rotating block 502.

[0039] Furthermore, motor 2 is a relatively mature component in existing technology applications, capable of driving in both forward and reverse directions, and will not be elaborated on further here.

[0040] like Figures 1-7 As shown, a sealing block 505 is rotatably connected inside the sealing cavity. A connecting channel is opened inside the sealing block 505. A drive rod 506 is fixedly connected to the surface of the sleeve 504. The other end of the drive rod 506 passes through the connecting channel and is fixedly connected to a pump head 507. The pump head 507 is slidably connected to the inner wall of the connecting channel. A notch 512 communicating with the connecting channel is opened on the surface of the sealing block 505. A third hydraulic sensor 513 is fixedly connected to the inner wall of the notch 512.

[0041] The surface of the pump head 507 is provided with a first sealing ring 508, a detection area 509 and a second sealing ring 510 from top to bottom. The detection area 509 is provided with a second hydraulic sensor 511.

[0042] Specifically, during the process of the mounting shaft 503 being driven by the rotating block 502, the sleeve 504 can drive the drive rod 506 to move synchronously. Due to the limiting position of the pump head 507 by the connecting channel and the rotational connection between the sleeve 504 and the surface of the mounting shaft 503, the pump head 507 can reciprocate inside the connecting channel. During the movement, the position offset can drive the sealing block 505 to rotate and adjust the position of the notch 512. During the downward movement of the pump head 507, the notch 512 can be aligned with the liquid inlet chamber 105. When the pump head 507 moves upward, the notch 512 is aligned with the liquid outlet chamber 104, thereby achieving the purpose of pumping organic fluorine intermediate medium.

[0043] The first sealing ring 508 ensures that the organic fluorine intermediate medium passes through the connecting channel and enters the drive chamber 305 during the up-and-down movement of the pump head 507. The second sealing ring 510 prevents the lubricating oil inside the drive chamber 305 from being discharged along with the organic fluorine intermediate medium. The detection area 509, located in the middle, can detect whether liquid has entered the detection area 509 through the internally installed second hydraulic sensor 511. The pressure change is used to determine whether a leak has occurred. If the pressure change exceeds the preset value, a signal is transmitted to the controller and the device stops working. The operator can perform timely maintenance and repair on this part by observing the pressure change.

[0044] Furthermore, the lubricating oil can be introduced into the interior of the connecting channel to provide lubrication for the movement of the pump head 507 and the drive rod 506, reducing wear;

[0045] The third hydraulic sensor 513 is used to detect the pressure of the organic fluorine intermediate medium in the notch 512 during the pumping process and transmits the detected pressure to the controller.

[0046] like Figures 1-7 As shown, the auxiliary component 3 includes a hydraulic accumulator 301 and a first hydraulic sensor 306. The first hydraulic sensor 306 is disposed inside the drive cavity 305. The hydraulic accumulator 301 is disposed on one side of the housing 1. One end of the hydraulic accumulator 301 is connected to a connecting pipe 303. The other end of the connecting pipe 303 is connected to the drive cavity 305. A sampling pipe 302 is connected to the surface of the connecting pipe 303. A cap 304 is detachably provided on the top of the sampling pipe 302.

[0047] Specifically, the first hydraulic sensor 306 can detect the pressure inside the drive cavity 305 and transmit the detected pressure to the controller. The controller can compare the pressure values ​​detected by the first hydraulic sensor 306 and the third hydraulic sensor 513, and adjust the pressure inside the drive cavity 305 in real time through the hydraulic accumulator 301 and the connecting pipe 303 to ensure that the pressure inside the drive cavity 305 is greater than the pressure in the notch 512 during the suction process. This avoids the situation where the pressure inside the drive cavity 305 in the traditional structure is lower than the pressure during the suction process, which can easily cause leakage of the organic fluorine intermediate medium.

[0048] like Figures 1-7 As shown, the filter assembly 4 includes a connecting shell 403 disposed inside the liquid inlet chamber 105. The connecting shell 403 is fixedly connected to the inner wall of the liquid inlet chamber 105. The surface of the connecting shell 403 is provided with uniformly distributed filter holes 404. The inner top wall of the connecting shell 403 is rotatably connected to a connecting shaft 405. The lower end of the connecting shaft 405 passes through the connecting shell 403 and is fixedly connected to an impeller 408.

[0049] Two connecting plates 406 are fixedly connected to the surface of the connecting shaft 405 and are rotatably connected to the inner wall of the connecting shell 403. An mounting plate 407 is fixedly connected between the two connecting plates 406. A slide rod 412 is evenly distributed on one side of the mounting plate 407. One end of the slide rod 412 passes through the mounting plate 407, and the other end of the slide rod 412 is fixedly connected to a clearing rod 410. The clearing rod 410 matches the adjacent filter hole 404, and the diameter of the clearing rod 410 is smaller than the aperture of the filter hole 404.

[0050] The unblocking rod 410 has two symmetrically distributed inclined surfaces 409 on the side away from the sliding rod 412. A spring 411 is provided between the surface of the unblocking rod 410 and the mounting plate 407. One end of the spring 411 is fixedly connected to the surface of the unblocking rod 410, and the other end of the spring 411 is fixedly connected to the surface of the mounting plate 407.

[0051] The surface of the outer casing 1 is provided with an inlet pipe 401 that communicates with the liquid outlet chamber 104, and the surface of the outer casing 1 is provided with a discharge pipe 402 that communicates with the liquid inlet chamber 105. Both the inlet pipe 401 and the discharge pipe 402 are provided with a third one-way valve.

[0052] Specifically, during the extraction of the organofluorine intermediate medium, impurities in the circulating organofluorine intermediate medium can be filtered through the filter pores 404 to prevent impurities from moving along the circulation path and causing excessive wear on the inner wall of the circulation path and affecting the reaction.

[0053] Furthermore, the other end of the inlet pipe 401 is connected to the storage tank for the cleaning organic fluorine intermediate medium, and the other end of the outlet pipe 402 is connected to the wastewater collection storage tank. Reversing the output shaft of motor 2 allows the cleaning organic fluorine intermediate medium to be drawn through the third one-way valve, causing the cleaning organic fluorine intermediate medium to flow in reverse from the outlet chamber 104 to the inlet chamber 105. During this process, backwashing of the filter holes 404 is achieved, and the wastewater after backwashing can be discharged separately through the outlet pipe 402. The backwashing process provides… The organofluorine intermediate medium can drive the impeller 408 to rotate the connecting shaft 405, which in turn drives the connecting plate 406 and the mounting plate 407 to rotate synchronously. At the same time, it can drive the slide rod 412 to move the unblocking rod 410. The inner wall of the filter hole 404 squeezes the inclined surface 409 of the unblocking rod 410 to separate it from the filter hole 404. At the same time, the spring 411 is compressed until it moves to the next filter hole 404. Under the action of the spring 411, the unblocking rod 410 can be reset to achieve unblocking of the filter hole 404 and enhance the cleaning effect.

[0054] A method for recycling organofluorine intermediates includes the following steps:

[0055] S1. The controller starts the motor 2 to rotate forward, which drives the drive shaft 501 and the rotating block 502 to rotate. Then, the rotational motion is converted into the reciprocating linear motion of the drive rod 506 and the pump head 507 in the connecting channel of the sealing block 505 through the mounting shaft 503 and the sleeve 504. When the pump head 507 moves down, the notch 512 of the sealing block 505 is aligned with the liquid inlet chamber 105, and the organic fluorine intermediate medium is drawn in through the second one-way valve 102. When the pump head 507 moves up, the notch 512 is aligned with the liquid outlet chamber 104, and the organic fluorine intermediate medium is discharged through the first one-way valve 101, forming a directional circulation to provide a continuous flow of organic fluorine intermediate medium for the low-temperature chlorination reaction.

[0056] S2. During the circulation of the organofluorine intermediate medium, the drive chamber 305 is filled with perfluoropolyether oil for lubrication. The first hydraulic sensor 306 monitors the internal pressure of the drive chamber 305 in real time, and the third hydraulic sensor 513 monitors the suction pressure of the organofluorine intermediate medium at the notch 512. The controller receives the two pressure signals and compares them. Through the hydraulic accumulator 301 and the connecting pipe 303, the controller automatically adjusts the pressure inside the drive chamber 305 to ensure that it is always greater than the pressure of the organofluorine intermediate medium at the notch 512, forming a pressure barrier to prevent the organofluorine intermediate medium from leaking into the drive chamber 305 through the gap between the pump head 507 and the connecting channel.

[0057] S3. When the organic fluorine intermediate medium passes through the inlet chamber 105, it is filtered through the filter holes 404 on the connecting shell 403 to remove impurities. When it is necessary to clean the filter assembly 4, the controller switches the motor 2 to reverse, and at the same time, the third check valve in the inlet pipe 401 and the outlet pipe 402 causes the cleaning organic fluorine intermediate medium to flow in reverse from the outlet chamber 104 to the inlet chamber 105, backwashing the filter holes 404.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A piston pump, comprising a housing (1) and a controller, characterized in that, A motor (2) is provided on one side of the outer shell (1), an auxiliary component (3) is provided on the surface of the outer shell (1), a sealing cavity is provided inside the outer shell (1), an inlet cavity (105) and an outlet cavity (104) connected to the sealing cavity are provided on the top of the outer shell (1), a second one-way valve (102) connected to the inlet cavity (105) is fixedly connected to the top of the outer shell (1), a first one-way valve (101) connected to the outlet cavity (104) is fixedly connected to the top of the outer shell (1), a filter component (4) is provided inside the inlet cavity (105), a drive component (5) is provided inside the outer shell (1), and an installation shell (103) is provided on the other side of the outer shell (1). The drive assembly (5) includes a drive cavity (305) opened inside the housing (1) and connected to the sealing cavity. The drive cavity (305) is located below the sealing cavity. A rotating block (502) is rotatably connected to the inner wall of the drive cavity (305). A drive shaft (501) is fixedly connected to the center of one side of the rotating block (502). The other end of the drive shaft (501) passes through the housing (1) and is fixedly connected to the output shaft of the motor (2). An installation shaft (503) is eccentrically fixedly connected to the other side of the rotating block (502). A sleeve (504) is rotatably connected to the surface of the installation shaft (503). The drive cavity (305) is filled with lubricating oil, which is perfluoropolyether oil; A sealing block (505) is rotatably connected inside the sealing cavity. A connecting channel is opened inside the sealing block (505). A drive rod (506) is fixedly connected to the surface of the sleeve (504). The other end of the drive rod (506) passes through the connecting channel and is fixedly connected to a pump head (507). The pump head (507) is slidably connected to the inner wall of the connecting channel. A notch (512) communicating with the connecting channel is opened on the surface of the sealing block (505). A third hydraulic sensor (513) is fixedly connected to the inner wall of the notch (512). The auxiliary component (3) includes a hydraulic accumulator (301) and a first hydraulic sensor (306). The first hydraulic sensor (306) is located inside the drive cavity (305). The hydraulic accumulator (301) is located on one side of the outer shell (1). One end of the hydraulic accumulator (301) is connected to a connecting pipe (303). The other end of the connecting pipe (303) is connected to the drive cavity (305). A sampling tube (302) is connected to the surface of the connecting pipe (303). A cap (304) is detachably provided on the top of the sampling tube (302).

2. A piston pump according to claim 1, characterized in that, The surface of the pump head (507) is provided with a first sealing ring (508), a detection area (509) and a second sealing ring (510) from top to bottom. The detection area (509) is provided with a second hydraulic sensor (511).

3. A piston pump according to claim 1, characterized in that, The filter assembly (4) includes a connecting shell (403) disposed inside the liquid inlet chamber (105). The connecting shell (403) is fixedly connected to the inner wall of the liquid inlet chamber (105). The surface of the connecting shell (403) is provided with uniformly distributed filter holes (404). The inner top wall of the connecting shell (403) is rotatably connected to a connecting shaft (405). The lower end of the connecting shaft (405) passes through the connecting shell (403) and is fixedly connected to an impeller (408).

4. A piston pump according to claim 3, characterized in that, The surface of the connecting shaft (405) is fixedly connected to two connecting plates (406) that are rotatably connected to the inner wall of the connecting shell (403). An mounting plate (407) is fixedly connected between the two connecting plates (406). A slide rod (412) is evenly distributed on one side of the mounting plate (407). One end of the slide rod (412) passes through the mounting plate (407), and the other end of the slide rod (412) is fixedly connected to a dredging rod (410). The dredging rod (410) matches the adjacent filter hole (404), and the diameter of the dredging rod (410) is smaller than the aperture of the filter hole (404).

5. A piston pump according to claim 4, characterized in that, The unblocking rod (410) has two symmetrically distributed inclined surfaces (409) on the side away from the slide rod (412). A spring (411) is provided between the surface of the unblocking rod (410) and the mounting plate (407). One end of the spring (411) is fixedly connected to the surface of the unblocking rod (410), and the other end of the spring (411) is fixedly connected to the surface of the mounting plate (407).

6. A piston pump according to claim 5, characterized in that, The surface of the outer shell (1) is provided with an inlet pipe (401) that communicates with the liquid outlet chamber (104), and the surface of the outer shell (1) is provided with a discharge pipe (402) that communicates with the liquid inlet chamber (105). Both the inlet pipe (401) and the discharge pipe (402) are provided with a third one-way valve.

7. A method for recycling organofluorine intermediates, using the piston pump described in claim 6, characterized in that, The following methods and steps are included: S1. The motor (2) is started to rotate forward by the controller. The motor drives the drive shaft (501) and the rotating block (502) to rotate. Then, the rotational motion is converted into the reciprocating linear motion of the drive rod (506) and the pump head (507) in the connecting channel of the sealing block (505) through the mounting shaft (503) and the sleeve (504). When the pump head (507) moves down, the notch (512) of the sealing block (505) is aligned with the liquid inlet chamber (105), and the organic fluorine intermediate medium is sucked in through the second one-way valve (102). When the pump head (507) moves up, the notch (512) is aligned with the liquid outlet chamber (104), and the organic fluorine intermediate medium is discharged through the first one-way valve (101), forming a directional circulation to provide a continuous flow of organic fluorine intermediate medium for the low-temperature chlorination reaction. S2. During the circulation of the organic fluorine intermediate medium, the drive chamber (305) is filled with perfluoropolyether oil for lubrication. The first hydraulic sensor (306) monitors the internal pressure of the drive chamber (305) in real time, and the third hydraulic sensor (513) monitors the suction pressure of the organic fluorine intermediate medium at the notch (512). The controller receives the two pressure signals and compares them. The hydraulic accumulator (301) and the connecting pipe (303) automatically adjust the pressure in the drive chamber (305) to ensure that it is always greater than the pressure of the organic fluorine intermediate medium at the notch (512), forming a pressure barrier to prevent the organic fluorine intermediate medium from leaking into the drive chamber (305) through the gap between the pump head (507) and the connecting channel. S3. When the organic fluorine intermediate medium passes through the inlet chamber (105), it is filtered through the filter holes (404) on the connecting shell (403) to remove impurities. When the filter assembly (4) needs to be cleaned, the controller switches the motor (2) to reverse. At the same time, the third check valve in the inlet pipe (401) and outlet pipe (402) is used to make the cleaning organic fluorine intermediate medium flow in reverse from the outlet chamber (104) to the inlet chamber (105) to backwash the filter holes (404).

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