A new type of positive displacement pump

Abstract

The present invention relates to the technical field of volumetric pumps, and in particular to a novel volumetric pump, which includes a pump body, a feed valve, a discharge valve, a piston cylinder and a driving mechanism. The upper end of the pump body is provided with an inlet, and the lower end is provided with an outlet. The feed valve is connected to the inlet, and the discharge valve is connected to the outlet. The feed valve and the discharge valve are respectively used for one-way feeding and discharging of the pump body. The piston cylinder is connected to the inner cavity of the pump body and is used to change the size of the inner cavity of the pump body. When the inner cavity of the pump body becomes larger, the feed valve opens, and slurry is filled into the inner cavity of the pump body under the action of gravity. When the inner cavity of the pump body becomes smaller, the feed valve closes, and the slurry is pressed out from the discharge valve. The driving mechanism is used to drive the piston cylinder to operate. The pump body conveys slurry by feeding at the upper end and discharging at the lower end, which solves the problem that traditional mechanical diaphragm pumps cannot convey high-concentration slurry.

Description

Technical Field

[0001] The invention relates to the technical field of volumetric pumps, and in particular to a volumetric pump capable of conveying high-concentration slurry. Background Art

[0002] As a general-purpose machine, there are many types of positive displacement pumps, which are widely used in various industries of national production. With the advancement of science and technology, especially in recent years, petroleum, chemical industry, plastics and synthetic materials, and refrigeration technology.

[0003] Existing volumetric pumps generally adopt the method of feeding from the bottom and discharging from the top, which requires the feed to be pumped or fed with a large height difference. Therefore, it is only suitable for pressurizing slurries with a weight concentration of less than 65%. When high-concentration and uneven-concentration slurries are transported, they are prone to precipitation and blockage under the pump body, making it impossible to discharge the slurry and easily causing the diaphragm to rupture. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a new type of positive displacement pump, in which the pump body adopts an upper end feeding and lower end discharging method to transport slurry, thereby solving the problem that traditional mechanical diaphragm pumps cannot transport high-concentration slurry.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] The present invention is a novel volumetric pump, comprising a pump body, a feed valve, a discharge valve, a piston cylinder and a driving mechanism. The upper end of the pump body is provided with an inlet, and the lower end is provided with an outlet. The feed valve is connected to the inlet, and the discharge valve is connected to the outlet. The feed valve and the discharge valve are respectively used for one-way feeding and discharging of the pump body. The piston cylinder is connected to the inner cavity of the pump body and is used to change the size of the inner cavity of the pump body. When the inner cavity of the pump body becomes larger, the feed valve is opened, and the slurry is filled into the inner cavity of the pump body under the action of gravity. When the inner cavity of the pump body becomes smaller, the feed valve is closed, and the slurry is pressed out from the discharge valve. The driving mechanism is used to drive the piston cylinder to operate.

[0007] By adopting the above technical solution: the pump body adopts the upper feeding and lower discharging form, so that high-concentration and uneven slurry can flow smoothly from top to bottom along the predetermined route, and no sedimentation will occur to cause blockage, thus avoiding equipment abnormalities.

[0008] The feed valve is cylindrical and arranged obliquely, the upper end of the feed valve is the feed port, and one side of the lower part of the feed valve is provided with a discharge port connected to the inner cavity of the pump body, a feed valve core is provided between the feed port and the discharge port, and a feed valve seat matched with the feed valve core is connected in the feed port. An actuator is also provided in the feed valve, which drives the feed valve core to contact or separate from the feed valve seat so that the feed port and the discharge port are connected or cut off.

[0009] By adopting the above technical solution: the slurry enters the feed valve core from the feed port and enters the pump body from the discharge port. During feeding, the feed valve is actively opened under the control of the actuator, so that the slurry falls from the feed port into the discharge port under gravity, and then the actuator actively closes the feed valve to stop feeding.

[0010] The actuator comprises a hydraulic cylinder, which is mounted on one end of the feed valve away from the feed port, and one end of a hydraulic rod in the hydraulic cylinder is detachably fixedly connected to the feed valve core.

[0011] By adopting the above technical solution: a hydraulic cylinder is set as an actuator to drive the feed valve core, and one end of the hydraulic rod of the hydraulic cylinder is detachably connected to the feed valve core. When the valve core is worn, the valve core can be replaced.

[0012] The feed valve seat is in the shape of a hand wheel, the opening on the inner side of the feed valve seat is a conical opening, and the end of the feed valve core close to the feed valve seat is a cone-shaped shape adapted to the opening on the inner side of the feed valve seat; a connecting column is provided at the end of the feed valve core away from the feed valve seat, a feed back plate is fixed on the connecting column, a feed sealing ring is provided between the feed back plate and the connecting column, and a portion of the feed sealing ring extends beyond the outer cylindrical surface of the first valve face.

[0013] By adopting the above technical solution: a conical feed valve core is matched with a feed valve seat with a conical opening, and a sealing ring is installed on the feed valve core. At the same time, the sealing ring is installed on the feed valve core by connecting the feed back plate and the connecting column. In this way, the sealing ring swells after being compressed, so that the sealing ring and the feed valve seat fit tightly to ensure the tightness of the seal, and when the sealing ring is worn, the sealing ring can be replaced by removing the feed back plate.

[0014] The ends of the connecting column and the hydraulic rod that are close to each other are fixedly connected by a jacket, and the jacket contains two half shells that are fixedly connected by bolts. The ends of the connecting column and the hydraulic rod that are close to each other are provided with at least one group of annular limiting grooves, and the inner walls of the two half shells are provided with at least one group of annular limiting protrusions corresponding to the limiting grooves of the connecting column and the hydraulic rod respectively. When the two half shells are connected and the limiting protrusions are embedded in the corresponding limiting grooves, the connecting column and the hydraulic rod can be fixedly connected; a cylindrical spring is arranged outside the jacket, one end of the cylindrical spring is against the feed back plate, and the other end is against the hydraulic cylinder, and the cylindrical spring is always in a state of having a reverse force; a first guide hole is arranged at the center of the feed valve seat, and a guide column is arranged at one end of the feed valve core close to the feed valve seat, and the guide column is slidably matched with the first guide hole.

[0015] By adopting the above technical solution: the hydraulic rod and the connecting column are connected through a jacket composed of two half shells, and an annular limiting groove is also provided in the two half shells. By providing annular limiting protrusions on the hydraulic rod and the connecting column respectively, and the limiting groove is connected to the limiting protrusion, the hydraulic rod and the connecting column can be limited in the axial direction, and the reliability of the connection between the two is guaranteed; in addition, a cylindrical spring is sleeved on the connecting column, and the cylindrical spring is always in a compressed state in the feed valve, ensuring that the hydraulic rod and the connecting column are on the same axis, so that the feed valve core can accurately resist against the feed valve seat, and the feed valve core also has a guide column and a first guide hole that slides together to further ensure the accuracy of the displacement of the feed valve core.

[0016] The discharge valve is cylindrical, with a discharge valve seat connected to its upper end and a spring seat connected to its lower end. A discharge valve core is provided between the discharge valve seat and the spring seat, one end of the discharge valve core is matched with the discharge valve seat, and the other end is against the spring seat through a reverse spring; the discharge valve seat is in the shape of a hand wheel, the opening on the inner side of the discharge valve seat is a conical opening, one end of the discharge valve core close to the discharge valve seat is a cone-shaped body adapted to the opening on the inner side of the discharge valve seat, and one end of the discharge valve core away from the discharge valve seat is provided with a first guide rod slidingly matched with the guide hole, a discharge back plate is fixed on the first guide rod, a discharge sealing ring is connected between the discharge valve core and the discharge back plate, and a portion of the discharge sealing ring extends beyond the outer cylindrical surface of the first valve face; a limiting cylinder is provided at the bottom end of the discharge back plate, and the lower end of the limiting cylinder is against the spring seat after the discharge valve core descends.

[0017] By adopting the above technical scheme: the structure of the discharge valve is similar to that of a one-way valve, the anti-top spring pushes the discharge valve core against the opening of the discharge valve seat, and a sealing ring is arranged on the discharge valve core, through which the sealing ring can have more sufficient contact with the discharge valve seat to ensure the sealing effect, the discharge valve core adopts a conical structure, and forms a self-positioning effect with the discharge valve seat with a conical opening, and at the same time, the sealing ring is connected to the first guide rod through the discharge back plate to install the sealing ring on the discharge valve core, and the sealing ring swells after being compressed in this way, so that the sealing ring and the feed valve seat fit more closely to ensure the tightness of the seal, and when the sealing ring is worn, the sealing ring can be replaced by removing the discharge back plate, and a limiting cylinder is provided at the bottom of the discharge valve core, and the limiting cylinder goes down and pushes against the spring seat to protect the anti-top spring and prevent the spring from being excessively compressed.

[0018] The spring seat is in the shape of a handwheel with an upward arch inside. The top of the spring seat is provided with a guide hole. The side of the arched part of the spring seat is provided with multiple guide holes for the flow of slurry. A second guide hole is provided in the center of the discharge valve seat. A second guide rod is provided at the upper end of the discharge valve core. The second guide rod is slidably matched with the second guide hole.

[0019] By adopting the above technical solution: the spring seat is used to abut against the other end of the counter-top spring, and a guide hole is provided on the spring seat for the flow of slurry. The second guide rod cooperates with the guide hole on the spring seat to assist in providing stable guidance for the valve core, further improving the accuracy of the valve core displacement and improving the use effect.

[0020] A diaphragm is provided in the pump body, which divides the volume in the pump body into two chambers, one of which is a control chamber connected to the piston cylinder, and the other is a flow chamber connected to the feeding mechanism and the discharging mechanism. A signal rod is provided in the piston cylinder, one end of which extends into the control chamber and is fixedly connected to the diaphragm. A monitoring mechanism for judging the operating position of the signal rod is provided in the piston cylinder.

[0021] By adopting the above technical solution: the pump body includes two chambers, a control chamber and a flow chamber, which are respectively located on both sides of the diaphragm. The control chamber is connected to the hydraulic cylinder to control the reciprocating motion of the diaphragm, and the flow chamber is used to pump the slurry. When the diaphragm moves, a monitoring mechanism is arranged in the hydraulic cylinder to accurately monitor the position of the signal rod, thereby identifying the deformation degree of the diaphragm and avoiding diaphragm breakage.

[0022] The driving mechanism includes a reducer motor and a crankcase, wherein a crankshaft is arranged in the crankcase, and the shaft extension of the reducer motor and the input end of the crankshaft are connected via a reducer transmission. The crankshaft is provided with at least three cranks along the axial direction and the cranks are evenly distributed in the circumferential direction of the crankshaft. A corresponding number of working chambers are arranged in the piston cylinder, and pistons are arranged in each of the working chambers. The cranks and corresponding pistons are connected via a connecting rod transmission. When the crankshaft rotates, the crank pulls the connecting rod to make the piston perform linear reciprocating motion.

[0023] By adopting the above technical solution: at least three groups of cranks with uniform phase distribution are arranged on the crankshaft in the crankcase, and each crank is connected to a group of working chambers, so that each group of working chambers can work alternately. When the slurry is transported, the various slurry transport curves are superimposed to form a relatively stable transport curve, so that the fluctuation coefficient of the slurry transport is small, the slurry can be transported smoothly, and the safety of the slurry transport pipeline is ensured.

[0024] A pump cover is provided on the side of the pump body away from the control chamber, the pump cover is fixedly connected to the pump body by bolts and a sealing gasket is installed between the pump body and the pump cover; a circle of convex ribs is provided on the edge of the diaphragm, the pump body is located on one side of the control chamber and has a conical structure and an annular recess for placing the convex ribs is provided on its inner conical surface, an annular pressing cylinder is connected to the inner side of the pump cover, the pressing cylinder squeezes the convex ribs into the annular recess, and circular notches are provided on the side of the pressing cylinder close to the feeding mechanism and the discharging mechanism, and the slurry flows between the two notches.

[0025] By adopting the above technical solution: the edge of the diaphragm is installed into the recess by means of a convex rib integrated with the diaphragm, and the convex rib is pressed into the recess by a pressing cylinder integrated with the pump cover. Since the diaphragm is made of soft rubber and has a sealing function, there is no need to set up other sealing structures. The installation quality can be guaranteed by the diaphragm itself. The control chamber and the flow chamber will not communicate with each other, which also makes the structure simple and easy to replace when the diaphragm is damaged.

[0026] The above solution has the following advantages:

[0027] 1. In this application, the pump body adopts the form of upper feeding and lower discharging, so that high-concentration and uneven slurry can flow smoothly from top to bottom along the predetermined route without sedimentation and blockage, thus avoiding abnormal equipment conditions.

[0028] 2. In the present application, at least three groups of cranks with uniform phase distribution are arranged on the crankshaft in the crankcase, and each crank is connected to a group of working chambers, so that each group of working chambers can work alternately. When the slurry is transported, the various slurry transport curves are superimposed to form a relatively stable transport curve, so that the fluctuation coefficient of the slurry transport is small, the slurry can be transported smoothly, and the safety of the slurry transport pipeline is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of this application;

[0030] Figure 2 A partial cross-sectional top view of the crankcase and hydraulic cylinder of the present application;

[0031] Figure 3 This is a schematic cross-sectional structural diagram of the pump body of the present application;

[0032] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0033] Figure 5 It is a cross-sectional schematic diagram of the feed valve in this application;

[0034] Figure 6 It is a cross-sectional schematic diagram of the discharge valve in this application;

[0035] Figure 7 It is a structural schematic diagram of the spring seat in this application;

[0036] Figure 8 This is a schematic diagram of the structure of the signal rod in this application.

[0037] Description of the accompanying drawings: 1. reducer motor; 2. crankcase; 201. crankshaft; 202. crank; 3. piston cylinder; 301. piston; 302. connecting rod; 303. magnetic sensor; 4. pump body; 401. feed valve; 4011. feed valve core; 4012. feed sealing ring; 4013. feed back plate; 4014. jacket; 40111. connecting column; 40112. guide column; 4015. cylindrical spring; 4016. hydraulic cylinder; 4017. hydraulic rod; 4018. feed valve seat; 402. discharge valve; 4021. discharge valve seat; 4022. spring seat; 40221. guide hole; 40222 , guide hole; 4023, discharge valve core; 40231, first guide rod; 40232, second guide rod; 4024, discharge sealing ring; 4025, discharge back plate; 4026, limit cylinder; 4027, anti-top spring; 403, diaphragm; 4031, convex rib; 404, pump cover; 4041, pressure cylinder; 4042, notch; 5, signal rod; 501, first connecting rod; 5011, threaded column; 5012, support column; 5013, stop; 502, second connecting rod; 5021, first groove; 5022, second groove; 5023, threaded groove; 503, pin; 504, magnetic core; 505, buffer. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-8 The present invention is described with reference to the accompanying drawings and embodiments.

[0039] like Figure 1 and Figure 2 As shown, this scheme is a new type of positive displacement pump, which includes a pump body 4, a feed valve 401, a discharge valve 402, a piston cylinder 3 and a driving mechanism. The upper end of the pump body 4 is provided with an inlet, and the lower end thereof is provided with an outlet. The feed valve 401 is connected to the inlet, and the discharge valve 402 is connected to the outlet. The feed valve 401 and the discharge valve 402 are respectively used for one-way feeding and discharging of the pump body 4. The piston cylinder 3 is connected to the inner cavity of the pump body 4 to change the size of the inner cavity of the pump body 4. When the inner cavity of the pump body 4 becomes larger, the feed valve 401 is opened, and the slurry is filled into the inner cavity of the pump body 4 under the action of gravity. When the inner cavity of the pump body 4 becomes smaller, the feed valve 401 is closed, and the slurry is pressed out of the discharge valve 402. Out, the driving mechanism is used to drive the piston cylinder 3 to operate; since the traditional mechanical diaphragm 403 pump needs to be pumped or fed with a large height difference for inlet and outlet, it is only suitable for pressurizing slurry with a weight concentration of less than 65%. According to the flow characteristics of the slurry, the diaphragm 403 pump feeds at the lower end and discharges at the upper end. When high-concentration and uneven-concentration slurry is transported, it is easy to precipitate and clog under the pump body 4, making it impossible to discharge the slurry and easily causing the diaphragm 403 to rupture; in this embodiment, the pump body 4 adopts the form of upper feeding and lower discharging, so that high-concentration and uneven slurry can flow smoothly from top to bottom along the predetermined route, and no sedimentation and blockage will occur, thereby avoiding equipment abnormalities.

[0040] The driving mechanism includes a reducer motor 1 and a crankcase 2. A crankshaft 201 is provided in the crankcase 2. The shaft extension of the reducer motor 1 and the input end of the crankshaft 201 are connected via a reducer transmission. The crankshaft 201 is provided with at least three cranks 202 along the axial direction and the cranks 202 are evenly distributed in the circumferential direction of the crankshaft 201. The piston cylinder 3 is provided with a corresponding number of working chambers as the cranks 202. Pistons 301 are provided in the working chambers. The cranks 202 and the corresponding pistons 301 are connected via connecting rods 302. When the crankshaft 201 rotates, the cranks 202 pull the connecting rods 302 to make the pistons 301 perform linear reciprocating motion. The traditional filling industrial pump uses a hydraulic oil pump as a power source. The hydraulic system has large energy loss, low overall operating efficiency, and the double cylinders work alternately. The slurry conveying fluctuates greatly, causing great damage to the conveying pipeline. Especially when conveying over long distances, the pipeline is prone to safety and environmental accidents. The control system of the filling industrial pump is mainly a hydraulic system. The failure rate of the hydraulic system is high, and the fault repair is difficult. In addition, the mainstream S-type swing valve and the eyeglass plate are metal-to-metal friction and sealing, and the service life is about 400 hours, which is short. In this embodiment, three groups of cranks 202 and working chambers are provided. The cranks 202 and the corresponding pistons 301 are connected by connecting rods 302, and the phase difference of the cranks 202 on the crankshaft 201 is 120°. When conveying slurry, the three groups of piston cylinders 3 can work alternately. The three groups of slurry conveying curves are superimposed to form a relatively stable conveying curve, so that the fluctuation coefficient of slurry conveying is small, and the theoretical fluctuation coefficient is less than 10%. The slurry can be conveyed steadily to ensure the safety of the slurry conveying pipeline.

[0041] like Figure 3 and Figure 5As shown, the feed valve 401 is cylindrical and arranged obliquely, the upper end of the feed valve 401 is a feed port, one side of the lower part of the feed valve 401 is provided with a discharge port connected to the inner cavity of the pump body 4, a feed valve core 4011 is provided between the feed port and the discharge port, a feed valve seat 4018 adapted to the feed valve core 4011 is connected to the feed port, and an actuator is also provided in the feed valve 401, the actuator drives the feed valve core 4011 to contact or separate with the feed valve seat 4018 so that the feed port and the discharge port are connected or cut off, and the actuator includes a hydraulic cylinder 4016, the hydraulic cylinder 4016 is installed on the end of the feed valve 401 away from the feed port, and the hydraulic cylinder 40 One end of the hydraulic rod 4017 in 16 is detachably fixedly connected to the feed valve core 4011, the feed valve seat 4018 is in the shape of a hand wheel, the opening on the inner side of the feed valve seat 4018 is a conical opening, and the end of the feed valve core 4011 close to the feed valve seat 4018 is in the shape of a cone adapted to the opening on the inner side of the feed valve seat 4018; the end of the feed valve core 4011 away from the feed valve seat 4018 is provided with a connecting column 40111, a feed back plate 4013 is fixed on the connecting column 40111, a feed sealing ring 4012 is provided between the feed back plate 4013 and the connecting column 40111, and a portion of the feed sealing ring 4012 extends beyond the outer circumferential surface of the first valve face.

[0042] During feeding, the slurry enters the feed valve core 4011 from the feed port and enters the pump body 4 from the discharge port, and the feed valve 401 is actively opened by the actuator, so that the slurry falls from the feed port into the discharge port under gravity, and then the actuator actively closes the feed valve 401 to stop feeding. In this embodiment, the hydraulic cylinder 4016 is used as an actuator to drive the feed valve core 4011 to operate, and one end of the hydraulic rod 4017 of the hydraulic cylinder 4016 is detachably connected to the feed valve core 4011. When the valve core is worn, the valve core can be re-engraved. Replacement is carried out, a cone-shaped feed valve core 4011 is matched with a feed valve seat 4018 with a conical opening, and a sealing ring is installed on the feed valve core 4011, and the sealing ring is installed on the feed valve core 4011 by connecting the feed back plate 4013 with the connecting column 40111. In this way, the sealing ring swells after being compressed, so that the sealing ring and the feed valve seat 4018 fit tightly to ensure the tightness of the seal, and when the sealing ring is worn, the sealing ring can be replaced by removing the feed back plate 4013.

[0043] Furthermore, the end of the connecting column 40111 and the hydraulic rod 4017 close to each other is fixedly connected by a jacket 4014, and the jacket 4014 contains two half shells fixedly connected by bolts. The end of the connecting column 40111 and the hydraulic rod 4017 close to each other is provided with at least one group of annular limiting grooves, and the inner walls of the two half shells are provided with at least one group of annular limiting protrusions corresponding to the limiting grooves of the connecting column 40111 and the hydraulic rod 4017. When the two half shells are connected and the limiting protrusions are embedded in the corresponding limiting grooves, the connecting column 40111 and the hydraulic rod 4017 can be fixedly connected; the jacket 4014 is covered with a cylindrical spring 4015, one end of the cylindrical spring 4015 is against the feed back plate 4013, and the other end is against the hydraulic cylinder 4016, and the cylindrical spring 4015 is always in a state of having a reverse force; in this scheme, a guide hole is also provided to provide positioning for the feed valve core 4011, a first guide hole is provided at the center of the feed valve seat 4018, and a guide column 40112 is provided at one end of the feed valve core 4011 close to the feed valve seat 4018, and the guide column 40112 is slidably matched with the first guide hole to ensure that the contact position of the valve core and the feed valve seat 4018 is accurate each time, and there will be no deviation to cause leakage, thereby improving the stability of the device. In this embodiment, the hydraulic rod 4017 is connected to the connecting column 40111 through a jacket 4014 composed of two half shells, and an annular limiting groove is also provided in the two half shells. By providing annular limiting protrusions on the hydraulic rod 4017 and the connecting column 40111 respectively, and the limiting groove is connected to the limiting protrusion, the hydraulic rod 4017 and the connecting column 40111 can be limited in the axial direction, thereby ensuring the reliability of the connection between the two. In addition, a cylindrical spring 4015 is sleeved on the connecting column 40111, and the cylindrical spring 4015 is always in a compressed state in the feed valve 401, thereby ensuring that the hydraulic rod 4017 and the connecting column 40111 are on the same axis, so that the feed valve core 4011 can accurately resist against the feed valve seat 4018. The feed valve core 4011 also has a guide column 40112 that slides with the first guide hole to further ensure the accuracy of the displacement of the feed valve core 4011.

[0044] like Figure 3 , 6As shown in Figure 7, the discharge valve 402 is cylindrical, with a discharge valve seat 4021 connected to the upper end and a spring seat 4022 connected to the lower end. A discharge valve core 4023 is provided between the discharge valve seat 4021 and the spring seat 4022. One end of the discharge valve core 4023 is matched with the discharge valve seat 4021, and the other end is against the spring seat 4022 through a reverse spring 4027. The discharge valve seat 4021 is in the shape of a hand wheel, and the opening on the inner side of the discharge valve seat 4021 is a conical opening. One end of the discharge valve core 4023 close to the discharge valve seat 4021 is an opening on the inner side of the discharge valve seat 4021. A first guide rod 40231 is provided at one end of the discharge valve core 4023 which is away from the discharge valve seat 4021 and is slidably matched with the guide hole 40221. A discharge back plate 4025 is fixed on the first guide rod 40231. A discharge sealing ring 4024 is connected between the discharge valve core 4023 and the discharge back plate 4025. The discharge sealing ring 4024 partially extends out of the outer cylindrical surface of the first valve face. A limiting cylinder 4026 is provided at the bottom end of the discharge back plate 4025. The lower end of the limiting cylinder 4026 abuts against the spring seat 4022 after the discharge valve core 4023 descends. The discharge valve 402 has a similar structure to a one-way valve. The anti-press spring 4027 pushes the discharge valve core 4023 against the opening of the discharge valve seat 4021, and a sealing ring is arranged on the discharge valve core 4023. The sealing ring can have a more complete contact with the discharge valve seat 4021 to ensure the sealing effect. The discharge valve core 4023 adopts a cone-shaped structure to form a self-positioning effect with the discharge valve seat 4021 with a conical opening. At the same time, the sealing ring is connected to the discharge back plate 4025 and the first guide rod 40231. The sealing ring is connected and installed on the discharge valve core 4023. In this way, the sealing ring swells after being compressed, so that the sealing ring and the feed valve seat 4018 fit more closely to ensure the tightness of the seal. When the sealing ring is worn, the sealing ring can be replaced by removing the discharge back plate 4025. A limiting cylinder 4026 is provided at the bottom of the discharge valve core 4023. The limiting cylinder 4026 goes down and abuts against the spring seat 4022 to protect the anti-top spring 4027 and prevent the spring from being over-compressed.

[0045] Furthermore, the spring seat 4022 is in the shape of a hand wheel with an upward arch inside, the top of the spring seat 4022 is provided with a guide hole 40221, the side of the arched part of the spring seat 4022 is a plurality of guide holes 40222 for the flow of slurry, the center of the discharge valve seat 4021 is provided with a second guide hole, the upper end of the discharge valve core 4023 is provided with a second guide rod 40232, and the second guide rod 40232 is slidably matched with the second guide hole. The spring seat 4022 is used to abut against the other end of the anti-top spring 4027, and the spring seat 4022 is provided with a guide hole 40222 for the flow of slurry, and the second guide rod 40232 cooperates with the guide hole 40221 on the spring seat 4022 to provide auxiliary guidance for the valve core to further improve the accuracy of the valve core displacement and improve the use effect.

[0046] A pump cover 404 is provided on the side of the pump body 4 away from the control chamber. The pump cover 404 is fixedly connected to the pump body 4 by bolts and a sealing gasket is also installed between the pump body 4 and the pump cover 404; a circle of convex ribs 4031 is provided on the edge of the diaphragm 403, the pump body 4 is located on one side of the control chamber and has a conical structure and an annular recess for placing the convex rib 4031 is provided on its inner conical surface, an annular pressing cylinder 4041 is connected to the inner side of the pump cover 404, the pressing cylinder 4041 squeezes the convex rib 4031 into the annular recess, and circular notches 4042 are provided on the side of the pressing cylinder 4041 close to the feeding mechanism and the discharging mechanism, and the slurry flows between the two notches 4042. The edge of the diaphragm 403 is installed into the recess by means of a convex rib 4031 which is integral with the diaphragm 403, and the convex rib 4031 is pressed into the recess by a pressure cylinder 4041 which is integral with the pump cover 404. Since the diaphragm 403 is made of soft rubber and has a sealing function, there is no need to set up other sealing structures. The installation quality can be guaranteed by the diaphragm 403 itself. The control chamber and the flow chamber will not communicate with each other, which also makes the structure simple and easy to replace when the diaphragm 403 is damaged.

[0047] like Figure 3 As shown, a diaphragm 403 is provided in the pump body 4, and the diaphragm 403 divides the volume cavity in the pump body 4 into two chambers, one of which is a control chamber connected to the piston cylinder 3, and the other chamber is a circulation chamber connected to the feeding mechanism and the discharging mechanism. A signal rod 5 is provided in the piston cylinder 3, and one end of the signal rod 5 extends into the control chamber and is fixedly connected to the diaphragm 403. A monitoring mechanism for judging the running position of the signal rod 5 is provided in the piston cylinder 3. The pump body 4 includes two chambers, a control chamber and a circulation chamber, which are respectively located on both sides of the diaphragm 403. The control chamber is connected to the hydraulic cylinder 4016 to control the reciprocating motion of the diaphragm 403, and the circulation chamber is used to pump slurry. When the diaphragm 403 moves, a monitoring mechanism is provided in the hydraulic cylinder 4016 to accurately monitor the position of the signal rod 5, so as to identify the deformation degree of the diaphragm 403 and avoid the diaphragm 403 from breaking.

[0048] Furthermore, if Figure 3 , 4As shown in Figure 8, the monitoring mechanism includes a magnetic core 504 installed on the signal rod 5 and a magnetic sensor 303 installed on the inner wall of the hydraulic cylinder 4016, and the magnetic sensor 303 is used to receive the position signal emitted by the magnetic core 504; the signal rod 5 includes a first connecting rod 501 and a second connecting rod 502, one end of the first connecting rod 501 is connected to the diaphragm 403, and the other end thereof is connected to a support column 5012, the magnetic core 504 is sleeved on the support column 5012 and one end of the support column 5012 is threadedly connected to the second connecting rod 502, because the magnetic core 504 is prone to brittle fracture, a second groove 5022 is provided at one end of the second connecting rod 502 close to the first connecting rod 501 for inserting the support column 5012, and one side of the second groove 5022 is expanded with a circle of the first groove 5021 for accommodating the magnetic core 504, in order to achieve a fixed connection between the first connecting rod 501 and the second connecting rod 502, the second groove 5 022 is provided with a threaded groove 5023 on the side away from the first groove 5021, and one end of the support column 5012 is connected to the threaded column 5011 connected to the threaded groove 5023; buffers 505 are provided on both sides of the magnetic core 504, and a stop 5013 is provided at one end of the first connecting rod 501. After the groove of the first groove 5021 is engaged with the stop 5013, the buffers 505 on both sides press the magnetic core 504, so that the magnetic core 504 is placed in the area formed by the first groove 5021, the support column 5012 and the stop 5013, and buffers 505 are provided on both sides of the magnetic core 504, so that the shock between the first connecting rod 501 and the second connecting rod 502 can be absorbed by the buffers 505, which greatly reduces the impact on the magnetic core 504 and reduces the possibility of brittle fracture of the magnetic core 504. In addition, the structure of this scheme is easy to disassemble and install the magnetic core 504, and the use effect is good.

[0049] Furthermore, in this embodiment, the buffer 505 is a rubber gasket, which is annular and located in the first groove 5021 and is sleeved on the support column 5012. There are two groups of rubber gaskets and they are located on both sides of the magnetic core 504. The buffer 505 uses rubber gaskets for shock absorption. Two rubber gaskets are provided and are located on both sides of the magnetic core 504. After the first connecting rod 501 and the second connecting rod 502 are connected, the rubber gaskets on both sides of the magnetic core 504 tightly wrap the magnetic core 504, providing good shock absorption and buffering protection, thereby greatly reducing the brittle fracture accidents of the magnetic core 504.

[0050] Furthermore, a threaded column 5011 is connected to the first connecting rod 501, a threaded groove 5023 is provided on the second connecting rod 502, and a pin 503 is inserted into the second connecting rod 502 at the connection between the threaded groove 5023 and the threaded column 5011, and the pin 503 does not expose the surface of the second connecting rod 502. After such an arrangement, the radial displacement between the first connecting rod 501 and the second connecting rod 502 is limited by the pin 503, thereby further reducing the vibration of the magnetic core 504 and reducing the impact.

[0051] The present invention is described above in conjunction with specific implementation methods, but those skilled in the art should be aware that these descriptions are exemplary and are not limitations on the scope of protection of the present invention, and that those skilled in the art can make various variations and modifications to the present invention based on the spirit and principles of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims

1. A new type of positive displacement pump, characterized in that: The pump comprises a pump body (4), a feed valve (401), a discharge valve (402), a piston cylinder (3) and a driving mechanism. The upper end of the pump body (4) is provided with an inlet, and the lower end thereof is provided with an outlet. The feed valve (401) is connected to the inlet, and the discharge valve (402) is connected to the outlet. The feed valve (401) and the discharge valve (402) are respectively used for one-way feeding and discharging of the pump body (4). The piston cylinder (3) is connected to the inner cavity of the pump body (4) and is used to change the size of the inner cavity of the pump body (4). When the inner cavity of the pump body (4) becomes larger, the feed valve (401) is opened, and the slurry is filled into the inner cavity of the pump body (4) under the action of gravity. When the inner cavity of the pump body (4) becomes smaller, the feed valve (401) is closed, and the slurry is pressed out from the discharge valve (402). The driving mechanism is used to drive the piston cylinder (3) to operate. The discharge valve (402) is cylindrical in shape, with a discharge valve seat (4021) connected to its upper end and a spring seat (4022) connected to its lower end. A discharge valve core (4023) is provided between the discharge valve seat (4021) and the spring seat (4022). One end of the discharge valve core (4023) is matched with the discharge valve seat (4021), and the other end is pressed against the spring seat (4022) via a counter-spring (4027). The discharge valve seat (4021) is in the shape of a hand wheel, and the opening on the inner side of the discharge valve seat (4021) is a conical opening. One end of the discharge valve core (4023) close to the discharge valve seat (4021) is in contact with the opening on the inner side of the discharge valve seat (4021). The first guide rod (40231) is provided at one end of the discharge valve core (4023) which is away from the discharge valve seat (4021) and is slidably matched with the guide hole (40221); a discharge back plate (4025) is fixed on the first guide rod (40231); a discharge sealing ring (4024) is connected between the discharge valve core (4023) and the discharge back plate (4025); a portion of the discharge sealing ring (4024) extends out of the outer circumferential surface of the first valve face; a limiting cylinder (4026) is provided at the bottom end of the discharge back plate (4025); the lower end of the limiting cylinder (4026) abuts against the spring seat (4022) after the discharge valve core (4023) moves downward.

2. A novel positive displacement pump as claimed in claim 1, characterized in that: The feed valve (401) is cylindrical and arranged obliquely, the upper end of the feed valve (401) is a feed port, one side of the lower part of the feed valve (401) is provided with a discharge port connected to the inner cavity of the pump body (4), a feed valve core (4011) is provided between the feed port and the discharge port, a feed valve seat (4018) adapted to the feed valve core (4011) is connected to the feed port, and an actuator is also provided in the feed valve (401), the actuator drives the feed valve core (4011) to contact or separate with the feed valve seat (4018) so that the feed port and the discharge port are connected or disconnected.

3. A novel positive displacement pump as claimed in claim 2, characterized in that: The actuator comprises a hydraulic cylinder (4016), which is mounted on an end of the feed valve (401) away from the feed port, and one end of a hydraulic rod (4017) in the hydraulic cylinder (4016) is detachably fixedly connected to the feed valve core (4011).

4. A novel positive displacement pump as claimed in claim 3, characterized in that: The feed valve seat (4018) is in the shape of a hand wheel, the opening on the inner side of the feed valve seat (4018) is a conical opening, and the end of the feed valve core (4011) close to the feed valve seat (4018) is in the shape of a cone adapted to the opening on the inner side of the feed valve seat (4018); a connecting column (40111) is provided at the end of the feed valve core (4011) away from the feed valve seat (4018), a feed back plate (4013) is fixed on the connecting column (40111), a feed sealing ring (4012) is provided between the feed back plate (4013) and the connecting column (40111), and a portion of the feed sealing ring (4012) extends beyond the outer circumferential surface of the first valve face.

5. A novel positive displacement pump as claimed in claim 4, characterized in that: The ends of the connecting column (40111) and the hydraulic rod (4017) close to each other are fixedly connected by a jacket (4014), and the jacket (4014) includes two half shells fixedly connected by bolts. The ends of the connecting column (40111) and the hydraulic rod (4017) close to each other are provided with at least one group of annular limiting grooves, and the inner walls of the two half shells are provided with at least one group of annular limiting protrusions corresponding to the limiting grooves of the connecting column (40111) and the hydraulic rod (4017). When the two half shells are connected and the limiting protrusions are embedded in the corresponding limiting grooves, the connecting column (40111) and the hydraulic rod (4017) can be fixedly connected. 11) and the hydraulic rod (4017) are fixedly connected; the jacket (4014) is provided with a cylindrical spring (4015), one end of the cylindrical spring (4015) is against the feed back plate (4013), and the other end is against the hydraulic cylinder (4016), and the cylindrical spring (4015) is always in a state of having a reverse force; a first guide hole is provided at the center of the feed valve seat (4018), and a guide column (40112) is provided at one end of the feed valve core (4011) close to the feed valve seat (4018), and the guide column (40112) is slidably matched with the first guide hole.

6. A novel positive displacement pump as claimed in claim 1, characterized in that: The spring seat (4022) is in the shape of a handwheel with an upward arch inside, the top of the spring seat (4022) is provided with a guide hole (40221), the side of the arched part of the spring seat (4022) is provided with a plurality of guide holes (40222) for the flow of slurry, a second guide hole is provided in the center of the discharge valve seat (4021), and a second guide rod (40232) is provided at the upper end of the discharge valve core (4023), and the second guide rod (40232) is slidably matched with the second guide hole.

7. A novel positive displacement pump according to any one of claims 1 to 6, characterized in that: The pump body (4) is provided with a diaphragm (403), and the diaphragm (403) divides the volume chamber in the pump body (4) into two chambers, one of which is a control chamber connected to the piston cylinder (3), and the other is a flow chamber connected to the feeding mechanism and the discharging mechanism. The piston cylinder (3) is provided with a signal rod (5), one end of which extends into the control chamber and is fixedly connected to the diaphragm (403). The piston cylinder (3) is provided with a monitoring mechanism for determining the operating position of the signal rod (5).

8. A novel positive displacement pump as claimed in claim 1, characterized in that: The driving mechanism comprises a reducer motor (1) and a crankcase (2); a crankshaft (201) is arranged in the crankcase (2); an axial extension of the reducer motor (1) and an input end of the crankshaft (201) are connected by a reducer transmission; the crankshaft (201) is provided with at least three cranks (202) along the axial direction, and the cranks (202) are evenly distributed in the circumferential direction of the crankshaft (201); a piston cylinder (3) is provided with a corresponding number of working chambers as the cranks (202); pistons (301) are arranged in each of the working chambers; the cranks (202) and corresponding pistons (301) are connected by a connecting rod (302); when the crankshaft (201) rotates, the cranks (202) pull the connecting rod (302) to make the pistons (301) perform linear reciprocating motion.

9. A novel positive displacement pump as claimed in claim 7, characterized in that: A pump cover (404) is provided on the side of the pump body (4) away from the control chamber. The pump cover (404) is fixedly connected to the pump body (4) by bolts and a sealing gasket is installed between the pump body (4) and the pump cover (404). A circle of convex ribs (4031) is provided on the edge of the diaphragm (403). The pump body (4) is located on one side of the control chamber and has a conical structure. An annular recess for accommodating the convex ribs (4031) is provided on the inner conical surface thereof. An annular pressing cylinder (4041) is connected to the inner side of the pump cover (404). The pressing cylinder (4041) presses the convex ribs (4031) into the annular recess. The pressing cylinder (4041) is provided with circular notches (4042) on the sides close to the feeding mechanism and the discharging mechanism, and the slurry flows between the two notches (4042).

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