A chemical pump and use method

Abstract

The present invention provides a chemical pump and a method of use, and relates to the field of pump technology. The chemical pump includes a pump body with an impeller inside, a rotating shaft coaxially connected to the impeller, a pump cover connected to the pump body, a liquid inlet and outlet arranged on the pump body, a protection detection mechanism arranged at the liquid inlet and outlet and the pump body connected to the pump cover, including a sealing ring, a sealing cover arranged at the outer edge of the sealing ring, a hoop arranged on the outer wall of the sealing cover, a first and a second pipeline are connected between the detection box and the sealing ring, a sealing mechanism is arranged between the pump cover and the rotating shaft, a gland is connected to the pump cover, an electromagnetic valve is arranged on the first and the second pipelines, and an induced draft fan and a detector are arranged in the detection box; the sealing mechanism includes a first and a second sealing assembly, a ring groove matching the first sealing assembly and an axial groove matching the rotating shaft are correspondingly arranged on the gland, and the second sealing assembly includes a detection cavity arranged in the gland axial groove, and a detection electrode is arranged in the detection cavity. The present invention monitors the leakage or seepage point of the chemical pump in real time, and promptly discovers the leakage or seepage of the chemical pump.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and in particular to a chemical pump and a use method thereof. Background Art

[0002] Chemical pumps refer to a type of pump designed under the special requirements of chemical production for pumps, and are used in many fields such as industrial chemical production, petroleum industry, metallurgy and electricity, environmental protection and water treatment, etc. Orchard drainage, etc., to provide the necessary moisture for crops.

[0003] In the prior art, chemical pumps transport some acid and alkali solutions, such as hydrochloric acid, and due to process requirements, the solutions are often preheated, which increases the corrosiveness to the chemical pumps. When the chemical pumps leak or seep, the outflowing hydrochloric acid not only corrodes the equipment, but also the hydrogen chloride gas generated by the volatilization of hydrochloric acid pollutes the environment, seriously affecting human health. Summary of the invention

[0004] The purpose of the present invention is to develop a chemical pump and a method for using the chemical pump, which can monitor the leakage or seepage point of the chemical pump in real time so as to timely discover the leakage or seepage of the chemical pump.

[0005] The present invention is achieved through the following technical solutions:

[0006] A chemical pump, comprising:

[0007] The pump body has an impeller inside, and a rotating shaft is coaxially connected to the impeller;

[0008] A pump cover is connected to the pump body, and the rotating shaft is rotatably connected to the pump cover;

[0009] The liquid inlet and the liquid outlet are arranged on the pump body and are connected with the liquid inlet pipe and the liquid outlet pipe;

[0010] The protection detection mechanism is arranged at the liquid inlet, the liquid outlet and the pump body connected to the pump cover, and includes:

[0011] A sealing ring, the inner edge of which is connected to the corresponding liquid inlet, liquid outlet or pump body;

[0012] A sealing cover is arranged at the outer edge of the sealing ring;

[0013] A hoop, arranged on the outer wall of the enclosure;

[0014] The detection box is connected with the sealing ring through a first pipeline and a second pipeline;

[0015] A sealing mechanism is provided between the pump cover and the rotating shaft;

[0016] A gland connected to the pump cover outside the sealing mechanism;

[0017] Wherein, the first pipeline and the second pipeline are provided with electromagnetic valves, and the detection box is provided with an induced draft fan and a detector for detecting the gas generated by the volatilization of the solution transported by the chemical pump;

[0018] The sealing mechanism includes a first sealing component and a second sealing component which are arranged in sequence in a direction away from the impeller. The gland is provided with a ring groove which cooperates with the first sealing component and an axial groove which cooperates with the rotating shaft. The second sealing component includes a detection cavity which is arranged in the axial groove of the gland, and a detection electrode is arranged in the detection cavity.

[0019] Optionally, the shape of the sealing ring corresponds to the shapes of the corresponding liquid inlet and outlet and the shape of the pump body at the connection with the pump cover, the first pipeline and the second pipeline are respectively connected to both sides of the sealing ring, the sealing cover is made of acid and alkali resistant rubber elastic material, the shape of the sealing cover corresponds to the shape of the flange of the corresponding liquid inlet pipe, liquid outlet pipe and the shape of the pump cover, and the size of the sealing cover is smaller than the size of the corresponding liquid inlet pipe, liquid outlet pipe flange and pump cover.

[0020] Optionally, the outer walls of the flanges of the liquid inlet pipe and the liquid outlet pipe and the outer wall of the pump cover are provided with a circle of anti-slip grooves, and the shape of the clamp corresponds to the anti-slip grooves.

[0021] Optionally, the detection box is small in the middle and large on both sides, the first pipeline and the second pipeline are connected to the two sides of the detection box respectively, the induced draft fan is arranged in the two sides of the detection box, the detector is arranged in the middle of the detection box, the pipeline on the detection box is connected to an air pump and a valve is arranged on the pipeline, the detection box is provided with an air pipe with a valve, and an air pressure sensor is provided in the detection box to monitor the air pressure in the detection box.

[0022] Optionally, the first sealing assembly includes a dynamic ring seat, a dynamic ring and a static ring arranged in sequence between the rotating shaft and the pump cover, a spring and a push ring are provided between the dynamic ring seat and the dynamic ring, a dynamic ring sealing ring is provided on the dynamic ring, and a static ring sealing ring is provided on the static ring.

[0023] Optionally, the second sealing assembly includes a sealing groove arranged on the inner wall of the gland shaft groove, and the sealing groove is provided with a first membrane body, a second membrane body and a partition plate from the outside to the inside in order to divide the sealing groove into three sealing cavities, and the three sealing cavities are respectively a filling chamber, a trigger chamber and a detection chamber from the outside to the inside, the filling chamber is filled with soft sealing filler, the trigger chamber is filled with sodium bicarbonate, and a flow channel connected to the shaft groove is provided in the gland on the side of the detection chamber.

[0024] Optionally, a plurality of trigger racks are provided in the trigger chamber, and the trigger racks include a main rod connected to the partition, the main rod is arranged radially along the rotating shaft, a plurality of support rods perpendicular thereto are evenly connected to the main rod, and a plurality of fins are evenly distributed on the main rod and the support rods.

[0025] Optionally, the main rod and the support rod are both hollow tube structures and are interconnected, the main rod is connected to the detection cavity, and the inner walls of the main rod and the support rod are provided with a trigger layer, and the trigger layer is calcium hydroxide.

[0026] Optionally, a sealing ring is provided between the sealing groove and the inlet of the flow channel on the inner side wall of the gland shaft groove, and the sealing ring is provided between the gland and the rotating shaft for dynamic sealing.

[0027] A method for using a chemical pump comprises the following steps:

[0028] S1. After the liquid inlet and outlet of the pump body are connected to the liquid inlet pipe and the liquid outlet pipe respectively and the pump cover is connected to the pump body, the protection detection mechanism is sealed so that the sealing cover is closely attached to the outer wall of the corresponding flange of the liquid inlet pipe and the liquid outlet pipe or the outer wall of the pump cover, and the sealing cover is locked by a clamp to seal the inside of the protection detection mechanism;

[0029] S2. The induced draft fan in the detection box is running to circulate the air flow in the closed cavity formed by the protection detection mechanism and the detection box;

[0030] S3. The protection detection mechanism is tested for sealing performance. Except for the first pipeline and the second pipeline of the protection detection mechanism being tested, which are connected to the detection box, the solenoid valves on the first pipeline and the second pipeline of the other protection detection mechanisms are closed, the induced draft fan is turned off, and then the pressure is increased in the detection box, the detection box is kept sealed, and the air pressure in the detection box is monitored to see if it drops within a period of time;

[0031] S4. After the sealing performance test of the protection and detection mechanism is completed, the internal pressure of the detection box is released and then sealed again, the solenoid valves of the first pipeline and the second pipeline of all the protection and detection mechanisms are opened, and the induced draft fan is operated to circulate the air in the closed cavity between the multiple protection and detection mechanisms and the detection box;

[0032] Wherein, in the step S2, after the detector probe on the detection box detects the gas volatilized from the solution, the detector generates an electrical signal and sounds an alarm to remind personnel to check the sealing performance of the chemical pump inside the protection detection mechanism and repair the leakage or seepage point in time;

[0033] In step S3, when the protection detection mechanism performs the sealing performance test, multiple protection detection mechanisms perform the test alternately;

[0034] After the detection electrode in the detection cavity inside the gland detects the solution, an alarm is sounded to remind personnel that the solution in the pump cover is leaking.

[0035] The beneficial effects of the present invention are:

[0036] For the static seal of the pump body, a protection detection mechanism is set to seal the static seal inside and detect it in real time. By detecting whether there is gas volatilized from the solution, it is judged whether there is leakage or seepage. The detection accuracy is high, which prevents the leakage from gradually becoming serious due to the failure of manual visual inspection to observe slight leakage or seepage. The chemical pump reminds personnel to intervene in advance before a large leakage occurs. Even if a large leakage occurs at the static seal, the solution is sealed inside by the protection detection mechanism to avoid a large amount of solution leaking into the environment and causing serious consequences;

[0037] The protection and detection mechanism can automatically test the sealing performance of the internal static sealing structure periodically. By increasing the pressure inside the protection and detection mechanism, it is observed whether the gas seeps out from the static sealing part and causes the internal air pressure to drop, so as to judge the sealing performance of the static sealing structure. If the sealing performance drops, the sealing structure can be maintained in advance before leakage or seepage occurs, so as to timely grasp the sealing performance of the static sealing structure for pre-emptive prevention.

[0038] The sealing mechanism between the rotating shaft and the pump cover is mainly composed of the first sealing component, and the second sealing component is used as a backup to improve the sealing performance. When the first sealing component is working normally and has not failed, the second sealing component will not intervene to avoid its loss. As a safety guarantee, the second sealing component intervenes to continue sealing after the failure of the first sealing component to avoid solution leakage. At the same time, after the second sealing component intervenes, the staff can know this situation through the detection electrode so as to repair and maintain the chemical pump in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is the structural diagram of the chemical pump;

[0041] Figure 2 To protect the structural diagram of the testing organization;

[0042] Figure 3 for Figure 1 Sectional view at point A;

[0043] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0044] Figure numerals: 1. base; 2. pump body; 3. pump cover; 4. rotating shaft; 5. pressure cover; 6. protection and detection mechanism; 61. sealing ring; 62. sealing cover; 63. clamp; 64. first pipeline; 65. second pipeline; 66. detection box; 67. induced draft fan; 68. detector; 7. first sealing assembly; 71. dynamic ring seat; 72. dynamic ring; 73. static ring; 8. second sealing assembly; 81. sealing ring; 82. flow channel; 83. first membrane body; 84. packing chamber; 85. second membrane body; 86. trigger chamber; 87. partition; 88. detection chamber; 89. main rod; 810. support rod. DETAILED DESCRIPTION

[0045] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0049] like Figure 1~Figure 4 As shown, the present invention discloses a chemical pump, comprising a base 1, a pump body 2 is arranged on the base 1, a liquid inlet and a liquid outlet are arranged on the pump body 2, the liquid inlet and the liquid outlet are flange-connected with a liquid inlet pipe and a liquid outlet pipe respectively, a pump cover 3 is arranged on the pump body 2, an impeller is arranged in the pump body 2, a rotating shaft 4 is coaxially connected to the impeller, a bracket and a bearing box are further connected to the side of the pump body 2, a motor is arranged on the base 1 on the side of the pump body 2, and the output shaft of the motor passes through the bracket and the bearing box and is coaxially connected to the rotating shaft 4.

[0050] The pump body 2 is provided with three sets of protection detection mechanisms 6, which are respectively arranged on the flanges at the liquid inlet and the liquid outlet and at the pump body 2 connected to the pump cover 3. During the operation of the chemical pump, the liquid inlet, the liquid outlet and the pump cover 3 are potential leakage points, and there is a possibility of leakage. When leakage occurs at the liquid inlet, the liquid outlet and the pump cover 3, the protection detection mechanism 6 prevents the leaked solution from spreading into the environment to cause pollution, corrode other equipment, and cause damage to human health, and the protection detection mechanism 6 can detect whether these potential leakage points have leaked.

[0051] The protection detection mechanism 6 includes an annular sealing ring 61, the shape of which corresponds to the shape of the flange of the corresponding liquid inlet and liquid outlet and the shape of the pump body 2 at the connection with the pump cover 3, and the edge of the inner end of the sealing ring 61 is connected to the edge of the flange of the corresponding liquid inlet and liquid outlet and the edge of the pump body 2 connected to the pump cover 3 to achieve sealing. The edge of the outer end of the sealing ring 61 is provided with an annular sealing cover 62, which is made of rubber elastic material resistant to acid and alkali. The shape of the sealing cover 62 corresponds to the shape of the flange of the corresponding liquid inlet and liquid outlet pipes and the shape of the pump cover 3, and the size of the sealing cover 62 is smaller than their size, so that the sealing cover 62 maintains close contact when it is sleeved on their outer walls. A clamp 63 is provided on the outside of the sealing cover 62, and the clamp 63 locks and fixes the sealing cover 62 on the outer wall of the flange of the corresponding liquid inlet and liquid outlet pipes and the outer wall of the pump cover 3. A circle of anti-skid grooves can be opened on the outer walls of the flanges of the liquid inlet pipe and the liquid outlet pipe and the outer wall of the pump cover 3. The shape of the clamp 63 corresponds to the anti-skid groove. The clamp 63 is locked at the anti-skid groove so that the clamp 63 is in the anti-skid groove after being locked, thereby preventing the clamp 63 and the sealing cover 62 from sliding.

[0052] The protection detection mechanism 6 also includes a detection box 66. The first pipeline 64 and the second pipeline 65 are connected to the two sides of the sealing ring 61. The first pipeline 64 and the second pipeline 65 are respectively connected to the two sides of the detection box 66. Solenoid valves are provided on the first pipeline 64 and the second pipeline 65. The detection box 66 is small in the middle and large on both sides. In this embodiment, the two sides and the middle of the detection box 66 are cylindrical and coaxial, and the transition between the two sides and the middle of the detection box 66 is truncated. Draft fans 67 are provided on both sides of the detection box 66. The operation of the induced draft fan 67 can make the air flow circulate in the closed space formed by the sealing ring 61, the first pipeline 64, the detection box 66 and the second pipeline 65. A detector 68 is provided on the detection box 66. The probe of the detector 68 extends into the middle of the detection box 66. The detector 68 is an instrument for detecting volatile gases of the solution transported by the chemical pump. The detector 68 is electrically connected to the external system with an alarm. The detection box 66 is also connected to an air pump through a pipeline, and a valve is provided on the pipeline. An air pipe with a valve is provided on the detection box 66, and an air pressure sensor is provided in the detection box 66 to monitor the air pressure in the detection box 66. The air pump can increase the pressure inside the detection box 66, and the air pipe can reduce the pressure.

[0053] In daily operation of the chemical pump, the solenoid valves of the first pipeline 64 and the second pipeline 65 in the protection detection mechanism 6 are opened, and the induced draft fan 67 is running to circulate the airflow. If the static sealing structure on the inner side of the sealing ring 61 fails to seal and leaks or seepage occurs, the leaked or seeped solution evaporates and enters the detection box 66 with the airflow, and is detected by the detector 68 in the middle of the detection box 66. The detector 68 can send a signal to remind personnel to check the chemical pump.

[0054] During daily operation of the chemical pump, the protection detection mechanism 6 can perform sealing detection periodically. During the detection, only the sealing detection of the static seal inside the protection detection mechanism 6 can be performed at a time. Except for the solenoid valves on the first pipeline 64 and the second pipeline 65 of the protection detection mechanism 6 being opened during operation, the solenoid valves on the first pipeline 64 and the second pipeline 65 of the other protection detection mechanisms 6 are closed. Then the air pump pressurizes the inside of the detection box 66 so that the air pressure in the sealed space formed by the detection box 66 and the detected protection detection mechanism 6 is greater than the maximum pressure of the fluid in the chemical pump. Then the valve on the air pump pipeline is closed, and the inside of the detection box 66 is completely sealed for a period of time. According to the pressure drop inside the detection box 66 monitored by the air pressure sensor, it is judged whether the sealing of the static seal being detected has decreased. After the detection, the air pipe valve is opened to reduce the internal pressure of the detection box 66.

[0055] A sealing mechanism and a gland 5 for pressing and fixing the sealing mechanism are provided between the pump cover 3 and the rotating shaft 4, and the gland 5 is bolted to the pump cover 3. The sealing mechanism comprises a first sealing assembly 7 and a second sealing assembly 8, wherein the first sealing assembly 7 is located on the rotating shaft 4 on the side close to the impeller, and the first sealing assembly 7 is a main sealing structure, and the second sealing assembly 8 is a backup sealing structure, which intervenes when the sealing performance of the first sealing assembly 7 decreases.

[0056] The first sealing assembly 7 is a mechanical sealing structure, including a moving ring seat 71, a moving ring 72 and a stationary ring 73 which are arranged in sequence between the rotating shaft 4 and the pump cover 3. A spring and a push ring are arranged between the moving ring seat 71 and the moving ring 72 as a compensation mechanism. A moving ring sealing ring is arranged on the moving ring 72, and a stationary ring sealing ring is arranged on the stationary ring 73. The pressure cover 5 is correspondingly provided with a ring groove adapted to the first sealing assembly 7 and a shaft groove adapted to the rotating shaft 4. The inner diameter of the ring groove is adapted to the moving ring 72 and the stationary ring 73, and the inner diameter of the shaft groove is adapted to the rotating shaft 4. The moving ring 72 and the stationary ring 73 are located in the ring groove. The mechanical sealing structure is a prior art and will not be described in detail here.

[0057] The second sealing assembly 8 is provided on the gland 5, and includes a sealing groove provided on the inner wall of the shaft groove of the gland 5. The sealing groove is annular and is located on the gland 5 on the side of the static ring 73 away from the dynamic ring 72. In the sealing groove, a first film body 83, a second film body 85 and a partition 87 are provided in sequence from outside to inside. The first film body 83, the second film body 85 and the partition 87 are all annular and their inner diameters increase in sequence. The three-layer structure divides the sealing groove into three sealing cavities. The three sealing cavities are respectively a packing cavity 84, a trigger cavity 86 and a detection cavity 88 from outside to inside.

[0058] The inner diameter of the first membrane body 83 is adapted to the inner diameter of the shaft groove of the gland 5. The first membrane body 83 is located on the inner wall of the shaft groove of the gland 5. The packing cavity 84 inside the first membrane body 83 is filled with soft sealing packing. The trigger cavity 86 inside the second membrane body 85 is filled with sodium bicarbonate. A plurality of trigger racks are evenly arranged in the trigger cavity 86. The trigger rack is a hollow structure and is connected to the partition 87. The trigger rack includes a main rod 89. The main rod 89 is arranged along the radial direction of the trigger cavity 86. A plurality of support rods 810 perpendicular to the main rod 89 are evenly connected. The main rod 89 and the support rod 810 are both hollow tube structures and are connected to each other. The main rod 89 is connected to the partition 87 and is connected to the detection cavity 88. A plurality of fins are evenly distributed on the main rod 89 and the support rod 810 to increase the surface area of ​​the trigger rack. The inner walls of the main rod 89 and the support rod 810 are provided with a trigger layer that cooperates with the chemical pump conveying solution. In this embodiment, the chemical pump conveying solution is hydrochloric acid, and the trigger layer is calcium hydroxide. The heat generated by the reaction of hydrochloric acid and calcium hydroxide causes the sodium bicarbonate to decompose and produce carbon dioxide gas, which increases the air pressure inside the trigger chamber 86. The second membrane body 85 expands to push the soft sealing filler toward the rotating shaft 4. The soft sealing filler squeezes through the first membrane body 83 and surrounds the rotating shaft 4 to achieve filler sealing.

[0059] In the actual production process, the hydrochloric acid transported by the chemical pump may be preheated to a certain temperature. At this time, no trigger layer may be set according to the temperature of the hydrochloric acid, and the temperature of the hydrochloric acid itself can decompose the sodium bicarbonate. Alternatively, the thickness of the trigger layer may be small and the distribution may be sparse, so as to reduce the total heat generated by the reaction of hydrochloric acid and sodium bicarbonate and control the heating temperature of the trigger frame.

[0060] A plurality of flow channels 82 are provided in the gland 5 on the side of the detection cavity 88 close to the static ring 73. One end of the flow channel 82 extends to the inner wall of the shaft groove of the gland 5, and the other end of the flow channel 82 is connected to the detection cavity 88. The plurality of flow channels 82 are arranged at equal intervals in a circular trajectory around the outer side of the rotating shaft 4. A sealing ring 81 is provided between the sealing groove and the entrance of the flow channel 82 on the inner wall of the shaft groove of the gland 5. The sealing ring 81 is provided between the gland 5 and the rotating shaft 4 for dynamic sealing. The function of the sealing ring 81 is mainly to prevent the leaked solution and allow the leaked solution to enter the detection cavity 88 from the flow channel 82. Therefore, the sealing performance requirements of the sealing ring 81 are not high, and its main function is to guide the leaked solution into the flow channel 82.

[0061] The material of the first membrane 83 is low in toughness and tear strength, and will break when squeezed. The second membrane 85 is an air membrane, which has strong toughness, tear strength and elasticity. When the air pressure in the trigger cavity 86 inside the second membrane 85 increases, the second membrane 85 expands. A detection electrode is also provided at the bottom of the detection cavity 88. The detection electrode is electrically connected to an external system with an alarm. After the detection electrode detects hydrochloric acid, it transmits an electrical signal and generates an alarm to remind personnel that the chemical pump solution is leaking.

[0062] The invention also discloses a method for using a chemical pump, comprising the following steps:

[0063] S1. After the liquid inlet and liquid outlet of the pump body 2 are connected to the liquid inlet pipe and the liquid outlet pipe respectively and the pump cover 3 is connected to the pump body 2, the protection detection mechanism 6 is sealed so that the sealing cover 62 is closely attached to the outer wall of the corresponding flange of the liquid inlet pipe and the liquid outlet pipe or the outer wall of the pump cover 3, and the sealing cover 62 is locked by the clamp 63 to seal the inside of the protection detection mechanism 6;

[0064] S2. The induced draft fan 67 in the detection box 66 is operated to circulate air in the closed cavity formed by the protection detection mechanism 6 and the detection box 66;

[0065] S3. The protection detection mechanism 6 is tested for sealing performance. Except for the first pipeline 64 and the second pipeline 65 of the protection detection mechanism 6 being tested, which are connected to the detection box 66, the solenoid valves on the first pipeline 64 and the second pipeline 65 of the other protection detection mechanisms 6 are closed, the induced draft fan 67 is turned off, and then the pressure in the detection box 66 is increased, the detection box 66 is kept sealed, and the air pressure in the detection box 66 is monitored to see if it drops within a period of time;

[0066] S4. After the sealing performance test of the protection detection mechanism 6 is completed, the internal pressure of the detection box 66 is released and then sealed again, the solenoid valves of the first pipeline 64 and the second pipeline 65 of all the protection detection mechanisms 6 are opened, and the induced draft fan 67 is operated to make the closed cavity between the multiple protection detection mechanisms 6 and the detection box 66 circulate airflow;

[0067] Among them, in step S2, after the detector 68 probe on the detection box 66 detects the gas volatilized from the solution, the detector 68 generates an electrical signal and sounds an alarm to remind personnel to check the sealing performance of the chemical pump inside the protection detection mechanism 6 and repair the leakage or seepage point in time;

[0068] In step S3, when the protection detection mechanism 6 performs the sealing performance test, multiple protection detection mechanisms 6 perform the test alternately;

[0069] After the detection electrode in the detection cavity 88 inside the gland 5 detects the solution, an alarm is sounded to remind the personnel that the solution in the pump cover 3 is leaking.

[0070] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A chemical pump, characterized in that: include: The pump body has an impeller inside, and a rotating shaft is coaxially connected to the impeller; A pump cover is connected to the pump body, and the rotating shaft is rotatably connected to the pump cover; The liquid inlet and the liquid outlet are arranged on the pump body and are connected with the liquid inlet pipe and the liquid outlet pipe; The protection detection mechanism is arranged at the liquid inlet, the liquid outlet and the pump body connected to the pump cover, and includes: A sealing ring, the inner edge of which is connected to the corresponding liquid inlet, liquid outlet or pump body; A sealing cover is arranged at the outer edge of the sealing ring; A hoop, arranged on the outer wall of the enclosure; The detection box is connected with the sealing ring through a first pipeline and a second pipeline; A sealing mechanism is provided between the pump cover and the rotating shaft; A gland connected to the pump cover outside the sealing mechanism; Wherein, the first pipeline and the second pipeline are provided with electromagnetic valves, and the detection box is provided with an induced draft fan and a detector for detecting the gas generated by the volatilization of the solution transported by the chemical pump; The sealing mechanism comprises a first sealing component and a second sealing component which are arranged in sequence in a direction away from the impeller, the gland is provided with a ring groove which matches with the first sealing component and a shaft groove which matches with the rotating shaft, the second sealing component comprises a detection cavity which is arranged in the shaft groove of the gland, and a detection electrode is arranged in the detection cavity; The second sealing assembly also includes a sealing groove arranged on the inner wall of the gland shaft groove, and the sealing groove is provided with a first membrane body, a second membrane body and a partition plate from the outside to the inside in order to divide the sealing groove into three sealing cavities, and the three sealing cavities are a filling cavity, a trigger cavity and a detection cavity from the outside to the inside, the filling cavity is filled with soft sealing filler, the trigger cavity is filled with sodium bicarbonate, and a flow channel connected to the shaft groove is provided in the gland on the side of the detection cavity.

2. The chemical pump according to claim 1, characterized in that: The shape of the sealing ring corresponds to the shapes of the corresponding liquid inlet and outlet and the shape of the pump body at the connection with the pump cover. The first pipeline and the second pipeline are respectively connected to the two sides of the sealing ring. The sealing cover is made of acid and alkali resistant rubber elastic material. The shape of the sealing cover corresponds to the shape of the flange of the corresponding liquid inlet pipe, liquid outlet pipe and the shape of the pump cover. The size of the sealing cover is smaller than the size of the corresponding liquid inlet pipe, liquid outlet pipe flange and pump cover.

3. The chemical pump according to claim 2, characterized in that: The outer walls of the flanges of the liquid inlet pipe and the liquid outlet pipe and the outer wall of the pump cover are provided with a circle of anti-skid grooves, and the shape of the clamp corresponds to the anti-skid grooves.

4. The chemical pump according to claim 1, characterized in that: The detection box is small in the middle and large on both sides. The first pipeline and the second pipeline are connected to the two sides of the detection box respectively. The induced draft fan is arranged in the two sides of the detection box. The detector is arranged in the middle of the detection box. The pipeline on the detection box is connected to an air pump and a valve is arranged on the pipeline. The detection box is provided with an air pipe with a valve. The detection box is provided with an air pipe, and an air pressure sensor is arranged in the detection box to monitor the air pressure in the detection box.

5. The chemical pump according to claim 1, characterized in that: The first sealing assembly includes a dynamic ring seat, a dynamic ring and a static ring which are arranged in sequence between the rotating shaft and the pump cover, a spring and a push ring are arranged between the dynamic ring seat and the dynamic ring, a dynamic ring sealing ring is arranged on the dynamic ring, and a static ring sealing ring is arranged on the static ring.

6. The chemical pump according to claim 1, characterized in that: A plurality of trigger racks are arranged in the trigger chamber, and the trigger racks include a main rod connected to the partition, the main rod is arranged radially along the rotating shaft, a plurality of support rods perpendicular to the main rod are evenly connected to the main rod, and a plurality of fins are evenly distributed on the main rod and the support rods.

7. The chemical pump according to claim 6, characterized in that: The main rod and the support rod are both hollow tube structures and are interconnected. The main rod is connected to the detection cavity. The inner walls of the main rod and the support rod are provided with a trigger layer, and the trigger layer is calcium hydroxide.

8. The chemical pump according to claim 1, characterized in that: A sealing ring is provided between the sealing groove and the flow channel at the inlet of the inner wall of the gland shaft groove, and the sealing ring is provided between the gland and the rotating shaft for dynamic sealing.

9. A method for using a chemical pump according to any one of claims 1 to 8, characterized in that: The steps include: S1. After the liquid inlet and outlet of the pump body are connected to the liquid inlet pipe and the liquid outlet pipe respectively and the pump cover is connected to the pump body, the protection detection mechanism is sealed so that the sealing cover is closely attached to the outer wall of the corresponding flange of the liquid inlet pipe and the liquid outlet pipe or the outer wall of the pump cover, and the sealing cover is locked by a clamp to seal the inside of the protection detection mechanism; S2. The induced draft fan in the detection box is running to circulate the air flow in the closed cavity formed by the protection detection mechanism and the detection box; S3. The protection detection mechanism is tested for sealing performance. Except for the first pipeline and the second pipeline of the protection detection mechanism being tested, which are connected to the detection box, the solenoid valves on the first pipeline and the second pipeline of the other protection detection mechanisms are closed, the induced draft fan is turned off, and then the pressure is increased in the detection box, the detection box is kept sealed, and the air pressure in the detection box is monitored to see if it drops within a period of time; S4. After the sealing performance test of the protection and detection mechanism is completed, the internal pressure of the detection box is released and then sealed again, the solenoid valves of the first pipeline and the second pipeline of all the protection and detection mechanisms are opened, and the induced draft fan is operated to circulate the air in the closed cavity between the multiple protection and detection mechanisms and the detection box; Wherein, in the step S2, after the detector probe on the detection box detects the gas volatilized from the solution, the detector generates an electrical signal and sounds an alarm to remind personnel to check the sealing performance of the chemical pump inside the protection detection mechanism and repair the leakage or seepage point in time; In step S3, when the protection detection mechanism performs the sealing performance test, multiple protection detection mechanisms perform the test alternately; After the detection electrode in the detection cavity inside the gland detects the solution, an alarm is sounded to remind personnel that the solution in the pump cover is leaking.

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