A chemical pump with a seal compensation function

Abstract

The present invention discloses a chemical pump with a seal compensation function, which relates to the technical field of chemical pumps and includes: a pump base and a housing installed on the top of the pump base, and a pump shaft is installed inside the housing; a pneumatic seal mechanism, located inside the housing, for sealing the pump shaft, the pneumatic seal mechanism includes a seal housing fixedly connected inside the housing, and the pump shaft passes through the inside of the seal housing; an automatic air replenisher, located at the end of the seal housing, for automatically replenishing air inside the pneumatic seal mechanism. By setting the automatic air replenisher to cooperate with the pneumatic seal mechanism, the gas inside the air inflation groove is pushed into the air chamber for air replenishment, thereby pressurizing the elastic sealing ring, so that the elastic sealing ring can be tightly attached to the pump shaft again to form a seal, thereby ensuring the continuity of the seal, and preventing the device from shutting down for maintenance due to leakage at critical times, thus improving the overall practicality of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical pumps, and specifically to a chemical pump with a seal compensation function. Background Art

[0002] A chemical pump refers to a device used to transport liquids and increase their pressure in chemical production, which needs to meet the special requirements of chemical processes, such as high temperature resistance, low temperature resistance, corrosion resistance, wear resistance, and reliable operation. A chemical pump mainly consists of several main components such as a pump body, an impeller, a shaft, a sealing device, and a driving device. Among them, the pump body is the outer shell of the pump, carrying other components; the impeller is the core component of the pump, responsible for converting mechanical energy into the kinetic energy of the liquid; the shaft is the support rod of the impeller, used to transmit power; the sealing device is the key component to prevent the pump from leaking; and the driving device (such as an electric motor) provides power to make the pump operate normally.

[0003] In the process of using existing chemical pumps, an elastic sealing ring is used to seal between the shaft and the pump body shell. However, the sealing ring is prone to wear during long-term use, resulting in seal failure. Therefore, leakage is likely to occur, which is likely to lead to dangerous accidents. For this reason, we provide a chemical pump with a seal compensation function to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a chemical pump with a seal compensation function in order to solve the problem that the sealing ring is prone to wear during long-term use, resulting in seal failure.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A chemical pump with a seal compensation function, comprising: a pump base and a housing installed on the top of the pump base, a pump shaft is installed inside the housing; a pneumatic sealing mechanism, located inside the housing, used to seal the pump shaft, the pneumatic sealing mechanism includes a sealing shell fixedly connected inside the housing, and the pump shaft passes through the inside of the sealing shell; an automatic air replenisher, located at the end of the sealing shell, used to automatically replenish air inside the pneumatic sealing mechanism; a back suction assembly, located at the end of the sealing shell, used to suck the leaked liquid.

[0006] As a further solution of the present invention: The pneumatic sealing mechanism further includes an air chamber opened inside the sealing shell, an elastic sealing ring is installed inside the air chamber, and the elastic sealing ring fits on the outer wall of the pump shaft.

[0007] As a further solution of the present invention: The automatic air replenisher includes an inflation groove opened inside the housing. A groove communicating with the inflation groove is opened on the inner side of the sealing shell. A one-way solenoid valve is fixedly connected to the air inlet of the air chamber, and one end of the one-way solenoid valve extends into the groove. A compensation sleeve is installed at the air inlet of the inflation groove. A first piston block, a second piston block and a third piston block are respectively installed inside the compensation sleeve. The third piston block and the second piston block are fixedly connected by a connecting rod. A warning component for warning is arranged on the outer wall of the compensation sleeve. A connecting component for connection is arranged between the first piston block and the second piston block.

[0008] As a further solution of the present invention: The automatic air replenisher further includes a U-shaped seat fixedly connected to the outer wall of the compensation sleeve. A driving motor is installed on one side of the U-shaped seat. The output end of the driving motor is connected to a one-way threaded screw rod. One end of the one-way threaded screw rod penetrates into the inner side of the U-shaped seat and is rotatably connected to the U-shaped seat. A sliding rod is threadedly connected to the outer wall of the one-way threaded screw rod. One end of the sliding rod penetrates into the inner side of the compensation sleeve and is fixedly connected to the third piston block. An inclined groove is opened on the inner side of the sealing shell. A liquid flow sensor is installed inside the inclined groove.

[0009] As a further solution of the present invention: The warning component includes a conductive block fixedly connected to the outer wall of the compensation sleeve. A first protection sleeve and a power connection block are fixedly connected to the inner side of the sliding rod. And the power connection block is arranged inside the first protection sleeve. A second protection sleeve is slidably connected to the inner side of the first protection sleeve. A power spring is installed between the second protection sleeve and the first protection sleeve. Four elastic soft membranes are fixedly connected to the inner sides of the ports of the second protection sleeve and the conductive block respectively. And the four elastic soft membranes are annularly distributed inside the ports of the conductive block and the second protection sleeve. An alarm lamp for warning is further installed on the top of the pump seat. The alarm lamp is electrically connected to the power connection block through a wire.

[0010] As a further solution of the present invention: The connecting component includes an auxiliary sleeve fixedly connected to the inner side of the second piston block. A movable rod is slidably connected to the inner side of the auxiliary sleeve. And one end of the movable rod is fixedly connected to the first piston block. A connecting spring is installed between the movable rod and the second piston block.

[0011] As a further solution of the present invention: The connection component further includes a spherical rod slidably connected to the inner side of the compensation sleeve, and one end of the spherical rod penetrates into the inner side of the movable rod, and the other end of the spherical rod extends to the outside of the compensation sleeve. A circular ring is fixedly connected to the outer wall of the spherical rod, and an auxiliary spring is installed between the circular ring and the compensation sleeve. A trapezoidal groove communicating with the inflation groove is formed inside the sealing shell.

[0012] As a further solution of the present invention: The back suction component includes a suction shell fixedly connected to the end of the sealing shell. A suction groove is formed inside the suction shell. A diversion hole communicating with the inclined groove is formed inside the sealing shell, and the diversion hole communicates with the suction groove. A piston ring is installed inside the suction groove.

[0013] As a further solution of the present invention: The back suction component further includes a second straight rack fixedly connected to the bottom of the sliding rod. A fixed seat is fixedly connected to the inside of the U-shaped seat. A straight gear meshing with the second straight rack is rotatably connected to the inside of the fixed seat. A first straight rack is engaged with the bottom of the straight gear. Power rods are fixedly connected to the outer walls on both sides of the first straight rack, and one end of the power rod penetrates into the inside of the suction groove and is fixedly connected to the piston ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By setting the automatic air replenisher and the pneumatic sealing mechanism to cooperate with each other, the gas in the inflation groove is pushed into the air chamber for air replenishment, thereby pressurizing the elastic sealing ring, so that the elastic sealing ring can be tightly attached to the pump shaft again to form a seal, thereby ensuring the continuity of the seal, so that the device will not cause equipment shutdown and maintenance due to leakage at critical times, thus improving the overall practicality of the device;

[0016] 2. By setting the cooperation of parts such as the first piston block, when the first piston block moves to the port of the groove and the liquid flow sensor still detects the liquid flowing through, the sliding rod continues to move into the compensation sleeve under the drive of the drive motor and the single-thread screw rod, so that the second piston block can replenish the gas in the compensation sleeve into the air chamber.

[0017] Since the first piston block, the second piston block and the third piston block are arranged inside the compensation sleeve, three air replenishment operations can be performed. When the third air replenishment operation is needed, the first piston block has been against the other end of the inflation groove, and the second piston block is located inside the groove. After the spherical rod is separated from the inclined surface at the end of the trapezoidal groove and moves to the inside of the trapezoidal groove, the spherical rod is moved out from the inside of the movable rod under the action of the auxiliary spring and no longer fixes the compensation sleeve, so that the third piston block moves to perform the third air replenishment process. The third piston block can push the second piston block to slide relative to the first piston block to perform the air replenishment operation. The first piston block and the second piston block in the initial state can be fixed by the spherical rod, so as to ensure the stability of the first and second air replenishment.

[0018] 3. By setting up the cooperation of the conductive block and other parts, a conductive sheet for conducting electricity is installed inside the conductive block, and the conductive sheet is electrically connected to the external power supply through a wire. When the second piston block completes the second air replenishment, the second protective sleeve is against the end of the conductive block. Then, when the third piston block performs the third air replenishment, the first protective sleeve slides on the outer wall of the second protective sleeve. At the same time, the electrical block pushes the elastic soft film open and inserts it into the conductive block to contact the conductive sheet inside the conductive block, so that the alarm light can be connected to the power supply to alarm, thereby reminding the staff that the device needs to be repaired, thereby avoiding leakage of the device during use at critical times, thereby improving the overall practicality of the device;

[0019] 4. By setting the cooperation of parts such as the piston ring, when the sliding rod moves toward the inside of the compensation sleeve, it drives the second spur rack to move synchronously, thereby driving the spur gear to shift the first spur rack to move in the opposite direction, so as to pull the piston ring through the power rod to suck the inside of the inclined groove, so as to suck the leaked liquid in the inclined groove into the suction groove to avoid excessive liquid causing the liquid flow sensor to misdetect. At the same time, when the liquid flow sensor does not detect the flow of liquid, the three air replenishment operations inside the compensation sleeve are intermittent, so that after the elastic sealing ring has formed a seal during the first air replenishment process, the first air replenishment process has not been completely used up. At this time, the drive motor will continue to run until the first The air replenishment operation is completed. During this process, the suction formed by the piston ring can generate negative pressure inside the chute, so that the elastic sealing ring can completely form liquid suction inside the pump seat without sealing, so that the liquid flow sensor can detect the liquid again, and the air replenishment operation will be performed again to avoid incomplete sealing. When the liquid flow sensor does not detect the flow of liquid, the suction action of the piston ring forms negative pressure inside the chute, further assisting the elastic sealing ring to form a sealing effect, thereby providing additional sealing support when the initial air replenishment is insufficient. The combination of air replenishment and leakage management design avoids the equipment from being shut down for maintenance due to sealing failure at critical times, thereby improving the reliability and efficiency of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a sectional view of the housing of the present invention;

[0022] Figure 3 is a sectional view of the sealed housing of the present invention;

[0023] Figure 4 of the present invention Figure 3 is an enlarged view at position A in;

[0024] Figure 5 is a schematic diagram of the internal structure of the compensation sleeve of the present invention;

[0025] Figure 6 of the present invention Figure 5 is an enlarged view at position B in;

[0026] Figure 7 is a sectional view of the conductive block and the first protective sleeve of the present invention;

[0027] Figure 8 is a schematic diagram of the butt joint of the conductive block and the power connection block of the present invention.

[0028] In the figure: 1, pump base; 2, housing; 3, pump shaft; 4, sealed housing; 5, suction housing; 6, compensation sleeve; 7, sliding rod; 8, U-shaped seat; 9, elastic sealing ring; 10, air chamber; 11, piston ring; 12, inclined groove; 13, suction groove; 14, diversion hole; 15, liquid flow sensor; 16, one-way threaded lead screw; 17, inflation groove; 18, first piston block; 19, drive motor; 20, spherical rod; 21, trapezoidal groove; 22, second piston block; 23, third piston block; 24, conductive block; 25, first protective sleeve; 26, first straight rack; 27, second straight rack; 28, fixed seat; 29, spur gear; 30, connecting rod; 31, movable rod; 32, auxiliary sleeve; 33, connecting spring; 34, ring; 35, auxiliary spring; 36, power connection block; 37, second protective sleeve; 38, power spring; 39, elastic soft film; 40, groove; 41, power rod; 42, one-way solenoid valve. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes the embodiments according to the overall structure of the present invention.

[0031] Embodiment 1

[0032] Please refer to Figures 1 to 8, this embodiment provides a chemical pump with a seal compensation function, including: a pump base 1 and a housing 2 installed on the top of the pump base 1, and a pump shaft 3 is installed inside the housing 2; a pneumatic seal mechanism, located inside the housing 2, for sealing the pump shaft 3, the pneumatic seal mechanism includes a seal housing 4 fixedly connected inside the housing 2, and the pump shaft 3 passes through the inside of the seal housing 4; an automatic air replenisher, located at the end of the seal housing 4, for automatically replenishing air inside the pneumatic seal mechanism. The pneumatic seal mechanism also includes an air chamber 10 opened on the inner side of the seal housing 4, an elastic sealing ring 9 is installed inside the air chamber 10, and the elastic sealing ring 9 is attached to the outer wall of the pump shaft 3. The automatic air replenisher includes an inflation groove 17 opened inside the housing 2, a groove 40 communicated with the inflation groove 17 is opened on the inner side of the seal housing 4, a one-way solenoid valve 42 is fixedly connected at the air inlet of the air chamber 10, and one end of the one-way solenoid valve 42 extends into the inside of the groove 40. A compensation sleeve 6 is installed at the air inlet of the inflation groove 17. A first piston block 18, a second piston block 22 and a third piston block 23 are respectively installed inside the compensation sleeve 6. The third piston block 23 and the second piston block 22 are fixedly connected by a connecting rod 30. The automatic air replenisher also includes a U-shaped seat 8 fixedly connected to the outer wall of the compensation sleeve 6. A driving motor 19 is installed on one side of the U-shaped seat 8. The output end of the driving motor 19 is connected with a one-way threaded lead screw 16, and one end of the one-way threaded lead screw 16 penetrates into the inside of the U-shaped seat 8 and is rotatably connected with the U-shaped seat 8. A sliding rod 7 is threadedly connected to the outer wall of the one-way threaded lead screw 16, and one end of the sliding rod 7 penetrates into the inside of the compensation sleeve 6 and is fixedly connected with the third piston block 23. An inclined groove 12 is opened on the inner side of the seal housing 4, and a liquid flow sensor 15 is installed inside the inclined groove 12;

[0033] First, an air supply valve penetrating to the outside is installed inside the air chamber 10. After the seal housing 4 is installed inside the housing 2 and the elastic sealing ring 9 is attached to the outer wall of the pump shaft 3, the air chamber 10 can be supplied with air through the air supply valve, so that the elastic sealing ring 9 is tightly pressed against the outer wall of the pump shaft 3 under the extrusion force all around, thereby forming a seal between the pump shaft 3 and the seal housing 4. By pressing and tightening through air pressure extrusion, it can be ensured that the contact between the elastic sealing ring 9 and the pump shaft 3 is closer, thereby improving the sealing performance;

[0034] When the elastic sealing ring 9 wears during long-term use, the liquid inside the housing 2 leaks directly from the gap between the pump shaft 3 and the elastic sealing ring 9 into the inclined groove 12. When the liquid flow sensor 15 detects the liquid flowing through, it can transmit a signal to the external PLC controller. The PLC controller controls the intermittent start of the driving motor 19, and the one-way solenoid valve 42 is in the open state. The output end of the driving motor 19 drives the one-way threaded lead screw 16 to rotate, thereby driving the sliding rod 7 to drive the first piston block 18 to move into the air charging groove 17, so as to push the gas inside the air charging groove 17 into the air chamber 10 for air replenishment, thereby forming pressure on the elastic sealing ring 9, so that the elastic sealing ring 9 can be tightly attached to the pump shaft 3 again to form a seal, thus ensuring the continuity of the seal and preventing the device from stopping for maintenance due to leakage at critical times, thereby improving the overall practicality of the device.

[0035] Embodiment 2

[0036] A warning component for warning is arranged on the outer wall of the compensation sleeve 6. The warning component includes a conductive block 24 fixedly connected to the outer wall of the compensation sleeve 6. A first protective sleeve 25 and a power connection block 36 are fixedly connected to the inner side of the sliding rod 7, and the power connection block 36 is arranged inside the first protective sleeve 25. A second protective sleeve 37 is slidably connected inside the first protective sleeve 25. A power spring 38 is installed between the second protective sleeve 37 and the first protective sleeve 25. Four elastic soft membranes 39 are fixedly connected to the inner sides of the ports of the second protective sleeve 37 and the conductive block 24, and the four elastic soft membranes 39 are annularly distributed inside the ports of the conductive block 24 and the second protective sleeve 37. An alarm lamp for warning is also installed on the top of the pump base 1, and the alarm lamp is electrically connected to the power connection block 36 through a wire;

[0037] A conductive sheet for conducting electricity is installed inside the conductive block 24, and the conductive sheet is electrically connected to an external power source through a wire. When the second piston block 22 completes the second air replenishment, the second protective sleeve 37 abuts against the end of the conductive block 24. Subsequently, when the third piston block 23 performs the third air replenishment, the first protective sleeve 25 slides on the outer wall of the second protective sleeve 37. At the same time, the power connection block 36 pushes open the elastic soft membrane 39 and inserts into the conductive block 24 to contact the conductive sheet inside the conductive block 24, so that the alarm lamp can be powered on for warning, thereby prompting the staff that this device needs to be repaired, and thus avoiding leakage during the use of the device at critical times, thereby improving the overall practicality of the device.

[0038] Embodiment 3

[0039] A connecting component for connection is provided between the first piston block 18 and the second piston block 22. The connecting component includes an auxiliary sleeve 32 fixedly connected to the inner side of the second piston block 22. A movable rod 31 is slidably connected to the inner side of the auxiliary sleeve 32, and one end of the movable rod 31 is fixedly connected to the first piston block 18. A connecting spring 33 is installed between the movable rod 31 and the second piston block 22. The connecting component further includes a spherical rod 20 slidably connected to the inside of the compensation sleeve 6, and one end of the spherical rod 20 penetrates into the inside of the movable rod 31. The other end of the spherical rod 20 extends to the outside of the compensation sleeve 6. A circular ring 34 is fixedly connected to the outer wall of the spherical rod 20, and an auxiliary spring 35 is installed between the circular ring 34 and the compensation sleeve 6. A trapezoidal groove 21 communicating with the inflation groove 17 is formed in the inner side of the sealing shell 4;

[0040] When the first piston block 18 moves to the port of the groove 40 and the liquid flow sensor 15 still detects the liquid flowing through, the sliding rod 7 continues to move into the compensation sleeve 6 under the drive of the drive motor 19 and the single-thread screw rod 16, so that the second piston block 22 can supplement the gas inside the compensation sleeve 6 into the air chamber 10;

[0041] Since the first piston block 18, the second piston block 22 and the third piston block 23 are provided inside the compensation sleeve 6 to perform three air supplement operations. When the third air supplement operation is required, when the first piston block 18 has abutted against the other end of the inflation groove 17 and the second piston block 22 is located inside the groove 40, after the spherical rod 20 separates from the inclined surface at the port of the trapezoidal groove 21 and moves into the trapezoidal groove 21, the spherical rod 20 moves out of the inside of the movable rod 31 under the action of the auxiliary spring 35 and no longer fixes the compensation sleeve 6. Thus, during the third air supplement process when the third piston block 23 moves, the third piston block 23 can push the second piston block 22 to slide relative to the first piston block 18 for air supplement operation. The first piston block 18 and the second piston block 22 in the initial state can be fixed by the spherical rod 20, so as to ensure the stability of the first and second air supplements.

[0042] Embodiment 4

[0043] The back suction assembly is located at the end of the sealing housing 4 and is used for sucking the leaked liquid. The back suction assembly includes a suction housing 5 fixedly connected to the end of the sealing housing 4. A suction groove 13 is formed inside the suction housing 5. A diversion hole 14 communicating with the inclined groove 12 is formed inside the sealing housing 4, and the diversion hole 14 communicates with the suction groove 13. A piston ring 11 is installed inside the suction groove 13. The back suction assembly further includes a second straight rack 27 fixedly connected to the bottom of the sliding rod 7. A fixed seat 28 is fixedly connected inside the U-shaped seat 8. A spur gear 29 meshing with the second straight rack 27 is rotatably connected inside the fixed seat 28. The bottom of the spur gear 29 meshes with a first straight rack 26. Power rods 41 are fixedly connected to the outer walls on both sides of the first straight rack 26, and one end of each power rod 41 penetrates into the suction groove 13 and is fixedly connected to the piston ring 11;

[0044] When the sliding rod 7 moves inward into the compensation sleeve 6, it drives the second straight rack 27 to move synchronously, thereby driving the spur gear 29 to move the first straight rack 26 in the reverse direction. Then, the piston ring 11 is pulled through the power rod 41 to suck the inside of the inclined groove 12, so as to suck the leaked liquid inside the inclined groove 12 into the suction groove 13 to prevent the liquid flow sensor 15 from being misdetected due to excessive liquid. At the same time, when the liquid flow sensor 15 does not detect the liquid flowing through, the three-time air replenishment operation inside the compensation sleeve 6 is intermittent. After the elastic sealing ring 9 has formed a seal during the first air replenishment process and the first air replenishment process has not been completely used up, the drive motor 19 will continue to operate until the first air replenishment operation is completed. During this process, the suction formed by the piston ring 11 can generate a negative pressure inside the inclined groove 12, so that the elastic sealing ring 9 can suck the liquid inside the pump base 1 even if it is not completely sealed, so that the liquid flow sensor 15 can detect the liquid again, and the air replenishment operation will be carried out again to avoid incomplete sealing. When the liquid flow sensor 15 does not detect the liquid flowing, the suction action of the piston ring 11 forms a negative pressure inside the inclined groove 12, further assisting the elastic sealing ring 9 to form a sealing effect, so as to provide additional sealing support when the initial air replenishment is insufficient. The combination of air replenishment and leakage management design avoids the equipment from shutting down for maintenance due to seal failure at critical times, thereby improving the reliability and efficiency of equipment operation.

[0045] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A chemical pump with sealing compensation function, characterized in that: include: A pump seat (1) and a shell (2) mounted on the top of the pump seat (1), wherein a pump shaft (3) is mounted on the inner side of the shell (2); A pneumatic sealing mechanism, located inside the housing (2) and used for sealing the pump shaft (3), the pneumatic sealing mechanism comprising a sealing shell (4) fixedly connected to the inside of the housing (2), and the pump shaft (3) passing through the inside of the sealing shell (4); An automatic air replenisher, located at the end of the sealing shell (4), and used for automatically replenishing air inside the air pressure sealing mechanism; A suction back assembly, located at the end of the sealing shell (4), and used for sucking the leaked liquid; The pneumatic sealing mechanism further comprises an air chamber (10) provided inside the sealing shell (4), an elastic sealing ring (9) being installed inside the air chamber (10), and the elastic sealing ring (9) being attached to the outer wall of the pump shaft (3); The automatic air replenisher comprises an air filling groove (17) provided inside the housing (2); a groove (40) communicating with the air filling groove (17) is provided on the inner side of the sealing shell (4); a one-way solenoid valve (42) is fixedly connected to the air inlet of the air chamber (10), and one end of the one-way solenoid valve (42) extends into the interior of the groove (40); a compensation sleeve (6) is installed at the air inlet of the air filling groove (17); a first piston block (18), a second piston block (22) and a third piston block (23) are respectively installed inside the compensation sleeve (6); the third piston block (23) and the second piston block (22) are fixedly connected via a connecting rod (30); a warning component for alarming is provided on the outer wall of the compensation sleeve (6); and a connecting component for connection is provided between the first piston block (18) and the second piston block (22); The automatic air replenisher further comprises a U-shaped seat (8) fixedly connected to the outer wall of the compensation sleeve (6), a driving motor (19) being installed on one side of the U-shaped seat (8), an output end of the driving motor (19) being connected to a one-way threaded screw (16), one end of which penetrates through the inner side of the U-shaped seat (8) and is rotatably connected to the U-shaped seat (8), a sliding rod (7) being threadedly connected to the outer wall of the one-way threaded screw (16), one end of which penetrates through the inner side of the compensation sleeve (6) and is fixedly connected to the third piston block (23), an inclined groove (12) being provided on the inner side of the sealing shell (4), and a liquid flow sensor (15) being installed on the inner side of the inclined groove (12); The warning component comprises a conductive block (24) fixedly connected to the outer wall of the compensation sleeve (6); a first protective sleeve (25) and a power connection block (36) are fixedly connected to the inner side of the sliding rod (7); the power connection block (36) is arranged on the inner side of the first protective sleeve (25); a second protective sleeve (37) is slidably connected to the inner side of the first protective sleeve (25); a power spring (38) is installed between the second protective sleeve (37) and the first protective sleeve (25); four elastic soft membranes (39) are fixedly connected to the inner side of the port of the second protective sleeve (37) and the conductive block (24); and the four elastic soft membranes (39) are distributed in an annular shape in the ports of the conductive block (24) and the second protective sleeve (37); an alarm light for alarming is also installed on the top of the pump seat (1); the alarm light is electrically connected to the power connection block (36) through a wire; The back-suction assembly comprises a suction shell (5) fixedly connected to the end of the sealing shell (4), a suction groove (13) is provided on the inner side of the suction shell (5), a guide hole (14) communicating with the inclined groove (12) is provided on the inner side of the sealing shell (4), and the guide hole (14) is communicated with the suction groove (13), and a piston ring (11) is installed on the inner side of the suction groove (13).

2. A chemical pump with sealing compensation function according to claim 1, characterized in that: The connecting assembly comprises an auxiliary sleeve (32) fixedly connected to the inner side of the second piston block (22); a movable rod (31) is slidably connected to the inner side of the auxiliary sleeve (32); one end of the movable rod (31) is fixedly connected to the first piston block (18); and a connecting spring (33) is installed between the movable rod (31) and the second piston block (22).

3. A chemical pump with sealing compensation function according to claim 2, characterized in that: The connection assembly further comprises a spherical rod (20) slidably connected to the inner side of the compensation sleeve (6), one end of the spherical rod (20) penetrates the inner side of the movable rod (31), and the other end of the spherical rod (20) extends to the outside of the compensation sleeve (6), a circular ring (34) is fixedly connected to the outer wall of the spherical rod (20), and an auxiliary spring (35) is installed between the circular ring (34) and the compensation sleeve (6), and a trapezoidal groove (21) communicating with the inflation groove (17) is provided on the inner side of the sealing shell (4).

4. A chemical pump with sealing compensation function according to claim 3, characterized in that: The suction back assembly also includes a second spur rack (27) fixedly connected to the bottom of the sliding rod (7); a fixed seat (28) is fixedly connected to the inner side of the U-shaped seat (8); a spur gear (29) meshing with the second spur rack (27) is rotatably connected to the inner side of the fixed seat (28); a first spur rack (26) is meshed at the bottom of the spur gear (29); a power rod (41) is fixedly connected to the outer walls on both sides of the first spur rack (26); and one end of the power rod (41) penetrates into the interior of the suction groove (13) and is fixedly connected to the piston ring (11).

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