Plunger type continuous metering pump

Abstract

The utility model discloses a plunger type continuous metering pump which comprises the following components: a material pumping assembly which comprises a pump body with a hollow cavity, and a driving connecting rod which has one end inserted into the pump body and is suitable for performing linear motion along the depth direction of the pump body; one end of the driving connecting rod is arranged on the positioning piece; the one-way valve assembly comprises a drainage block arranged on the pump body and located on the side, opposite to the driving connecting rod, of the positioning piece, a drainage opening formed in the drainage block, a sealing ball suitable for blocking the drainage opening, and a compression spring connected with the end, opposite to the drainage opening, of the sealing ball; an accommodating groove suitable for embedding the compression spring is formed in the positioning piece; the feeding valve assembly comprises a feeding adapter piece arranged at the open end, opposite to the extending end of the driving connecting rod, of the pump body, a material passing opening formed in the feeding adapter piece and communicated with the open end, and a valve body connected with the feeding adapter piece; an air cylinder is arranged in the valve body, and a piston rod of the air cylinder is suitable for blocking the material passing opening.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps, in particular to a plunger type continuous metering pump. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. The plunger pump is widely used in high pressure, large flow and flow regulation occasions.

[0003] For the plunger pumps commonly used in the current prior art, actual research and use have found that there are roughly the following problems:

[0004] First, in the existing plunger pump, the hydraulic oil and the material being transported share a cavity. As the use time increases, the cavity is more easily worn by the material, especially when transporting mixed materials, resulting in high energy consumption of the entire plunger pump.

[0005] Second, the existing plunger pumps have low pressure resistance and precision, and are not suitable for use in high-pressure and high-precision situations. At present, the switch valves in the pump body are all one-way ball valves, in which the one-way ball valve takes time to respond, and the feed must overcome the resistance of the one-way ball valve, resulting in the inability to feed cavities even if the feed appears, and it is impossible to judge whether there is leakage inside the pump body, such as a high-pressure plunger pump disclosed in publication number CN206429386U.

[0006] Third, after the power is cut off, the internal pressure will leak and cause the external material to enter the pump body. In addition, the feed is uncontrollable and there is no timely feedback when the feed is insufficient.

[0007] In summary, with regard to the above-mentioned problems existing in the plunger type continuous metering pump used in the prior art, it can be seen that from the perspective of optimizing the comprehensive performance of the plunger type continuous metering pump, it is necessary to further optimize the structure of the plunger type continuous metering pump. Utility Model Content

[0008] The utility model aims to provide a plunger type continuous metering pump to solve the technical problem of optimizing the comprehensive use performance of the plunger type continuous metering pump.

[0009] The plunger type continuous metering pump of the utility model is realized as follows:

[0010] A plunger type continuous metering pump, comprising:

[0011] A pump assembly, comprising a pump body with a hollow cavity, and a driving connecting rod with one end inserted into the pump body and adapted to perform linear motion along the depth direction of the pump body; one end of the driving connecting rod is arranged on a positioning member;

[0012] A one-way valve assembly, comprising a drainage block provided on the pump body and located on the side of the positioning member facing away from the driving connecting rod, a drainage port formed on the drainage block, a sealing ball suitable for blocking the drainage port, and a compression spring connected to one end of the sealing ball facing away from the drainage port; the positioning member is provided with a receiving groove suitable for the compression spring to be embedded;

[0013] A feed valve assembly comprises a feed adapter arranged at the open end of the extended end of the pump body facing away from the driving connecting rod, a feed port arranged on the feed adapter and connected to the open end, and a valve body connected to the feed adapter; a cylinder is arranged in the valve body, and the piston rod of the cylinder is suitable for blocking the feed port.

[0014] In an optional implementation of the utility model, the valve body is further provided with an elastic member connected to the end of the piston rod facing away from the material passage opening.

[0015] In an optional implementation of the present invention, the cylinder is also connected to a solenoid valve for controlling its operating state.

[0016] In an optional implementation of the utility model, a feed port for charging material into the valve body is also provided on the side wall of the valve body;

[0017] When the piston rod releases the blockage of the material passage, the feed port is communicated with the material passage so that the material entering the valve body through the feed port can enter the pump body through the material passage.

[0018] In an optional implementation of the utility model, the drainage block is further provided with a bucket-shaped limiting hole connected to the drainage port and suitable for partially embedding the sealing ball.

[0019] In an optional implementation of the present invention, a discharge port communicating with the hollow cavity is further provided on the side wall of the pump body and located on the side of the positioning member facing away from the one-way valve assembly; and

[0020] The discharge port is provided with an outlet pressure sensor.

[0021] In an optional implementation of the utility model, a throat sealing assembly is also provided at the end of the pump body suitable for driving the connecting rod to extend.

[0022] In an optional implementation of the utility model, the throat sealing assembly includes a throat base connected to the pump body, a sealing member disposed in the throat base, and a gland connected to an end of the throat base facing away from the pump body; wherein

[0023] The sealing member and the gland are formed with a through hole suitable for the driving connecting rod to pass through;

[0024] The driving connecting rod is sealingly matched with the inner wall of the through hole of the sealing component.

[0025] In an optional implementation of the utility model, the valve body is further provided with an isolating member that cooperates with the piston rod seal; the isolating member is used to prevent the material entering the valve body from the feed inlet from flowing into the cylinder;

[0026] An oil injection block gasket and an oil injection lubricating block are arranged between the piston rod and the isolating piece.

[0027] In an optional implementation of the present invention, a pressure detection sensor is further provided in the pump body and located on the side of the drainage block facing the feed valve assembly.

[0028] By adopting the above technical solution, the utility model has the following beneficial effects: the plunger-type continuous metering pump of the utility model, through the cooperation between the feed valve assembly and the one-way valve assembly, enables the driving connecting rod to continuously feed materials in a state of linear reciprocating motion in the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the plunger type continuous metering pump of the utility model;

[0030] Figure 2 It is a cross-sectional structural schematic diagram of the plunger type continuous metering pump of the utility model;

[0031] Figure 3 The schematic diagram of the local structure of the plunger type continuous metering pump of the utility model is shown in FIG. Figure 1 ;

[0032] Figure 4 The schematic diagram of the local structure of the plunger type continuous metering pump of the utility model is shown in FIG. Figure 2 .

[0033] In the figure: cylinder 1, isolation part 2, piston rod 3, oil injection block gasket 4, oil injection lubrication block 5, feed port 6, elastic part 7, drainage block 8, drainage port 81, bucket-shaped limit hole 82, sealing ball 9, compression spring 10, positioning part 11, pump body 12, material flow port 13, driving connecting rod 14, discharge port D, throat base 16, sealing part 17, pressure cover 18, discharge joint 19, outlet pressure sensor 20, feed adapter 21, solenoid valve 22, receiving groove 23, pressure detection sensor 24, mounting plate, feed port A. DETAILED DESCRIPTION

[0034] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0035] See also Figures 1 to 4 As shown, this embodiment provides a plunger-type continuous metering pump, including: a pump material assembly, a one-way valve assembly and a feed valve assembly used in conjunction with each other.

[0036] Specifically, first, there is a pump assembly, which includes a pump body 12 with a hollow cavity, and a driving connecting rod 14 with one end inserted into the pump body 12 and adapted to perform linear motion along the depth direction of the pump body 12. One end of the driving connecting rod 14 is arranged on a positioning member 11, and the positioning member 11 can move synchronously with the movement of the driving connecting rod 14. It can be understood that during the use of the plunger-type continuous metering pump, one end of the driving connecting rod 14 extending outside the pump body 12 is also connected to a servo motor for driving it to perform linear motion.

[0037] It should be noted that a throat sealing assembly is also provided on the end of the pump body 12 suitable for driving the connecting rod 14 to extend.

[0038] In this regard, an optional implementation is given as an example in conjunction with the accompanying drawings. The throat sealing assembly includes a throat base 16 connected to the pump body 12, a sealing member 17 disposed in the throat base 16, and a pressure cover 18 connected to the end of the throat base 16 facing away from the pump body 12; wherein the sealing member 17 and the pressure cover 18 are formed with a through hole suitable for the driving connecting rod 14 to pass through; the driving connecting rod 14 is sealed and matched with the inner wall of the through hole of the sealing member 17.

[0039] Next is the one-way valve assembly, which includes a drainage block 8 disposed on the pump body 12 and located on the side of the positioning member 11 facing away from the driving connecting rod 14, a drainage port 81 formed on the drainage block 8, a sealing ball 9 suitable for blocking the drainage port 81, and a compression spring 10 connected to the end of the sealing ball 9 facing away from the drainage port; the positioning member 11 is provided with a receiving groove 23 suitable for the compression spring 10 to be embedded, and a plurality of material flow ports 13 connected to the receiving groove 23 are provided at intervals on the side wall of the positioning member 11. Here, the structure of the sealing ball 9 and the compression spring 10 ensures that when the driving connecting rod 14 moves on the side facing away from the drainage block 8, the material will not flow back.

[0040] In order to better achieve the sealing effect of the sealing ball 9 on the drainage port on the drainage block 8, a bucket-shaped limiting hole 82 connected to the drainage port and suitable for partial embedding of the sealing ball 9 is further provided on the drainage block 8.

[0041] On the basis of the above structure, it should be noted that a discharge port D connected to the hollow cavity is provided on the side wall of the pump body 12 and located on the side of the positioning member 11 facing away from the one-way valve assembly; and the discharge port D is provided with an outlet pressure sensor 20, and in order to facilitate the discharged material to be connected to other mechanisms, the discharge port D is equipped with a discharge connector 19. A pressure detection sensor 24 is also provided in the pump body 12 and located on the side of the drainage block 8 facing the feed valve assembly. Here, the state of the material in the pump body 12 is detected by the mutual cooperation of the outlet pressure sensor 20 and the pressure detection sensor 24. When the driving connecting rod 14 moves linearly, the feed valve assembly can be actively opened or closed by the pressure setting value to ensure that the filler is filled without bubbles and the output pressure and flow of the equipment are constant, thereby realizing closed-loop control. At the same time, abnormalities in the pump body 12 can be responded to in time and then judged and maintained.

[0042] Next is the feed valve assembly: it includes a feed adapter 21 arranged at the open end of the extended end of the pump body 12 facing away from the driving connecting rod 14, a feed port 6 arranged on the feed adapter 21 and connected to the open end, and a valve body connected to the feed adapter 21; a cylinder 1 is arranged in the valve body, and the piston rod 3 of the cylinder 1 is suitable for blocking the feed port 6. The cylinder 1 is also connected to a solenoid valve 22 for controlling its operating state, and a feed port A for charging the inside of the valve body is also arranged on the side wall of the valve body. The valve body here can be optionally connected to the feed adapter 21 by threaded engagement. The solenoid valve 22 here can be designed on a mounting plate 25.

[0043] On the basis of the above structure, when the piston rod 3 releases the blockage of the feed port 6 , the feed port A is connected with the feed port 6 so that the material entering the valve body through the feed port A can enter the pump body 12 through the feed port 6 .

[0044] Based on the above situation, it should be noted that the valve body is also provided with an elastic member 7 connected to the end of the piston rod 3 facing away from the material passage 6. The elastic member 7 can be realized by a spring. Here, by designing the elastic member 7 in the valve body, it is ensured that when the equipment is powered off and the gas is cut off, no matter the internal pressure of the pump body 12 is greater than the external pressure or the external pressure is greater than the internal pressure, the material in the pump body 12 will not leak.

[0045] In addition, it should be noted that an isolation member 2 is provided in the valve body and seals with the piston rod 3; the isolation member 2 is used to prevent the material entering the valve body from the feed port A from flowing into the cylinder 1; an oil filling block gasket 4 and an oil filling lubrication block 5 are provided between the piston rod 3 and the isolation member 2, so as to reduce the damage to the isolation member 2 caused by the movement of the piston rod 3.

[0046] In summary, the plunger-type continuous metering pump of this embodiment can achieve uninterrupted glue discharge with high metering accuracy. The specific implementation principle is as follows: the pump body 12 is divided into an upper chamber F and a lower chamber E by a positioning member 11, wherein the lower chamber E is adjacent to one side of the feed valve assembly.

[0047] When the driving connecting rod 14 moves toward the side away from the feed valve assembly, the internal force of the upper chamber F is increased due to the squeezing, and the internal pressure of the lower chamber E is reduced due to the stretching. Since the pressure of the upper chamber F is greater than that of the lower chamber E, the sealing ball 9 fits tightly with the drainage block 8 to ensure that the material does not flow back from the upper chamber F to the lower chamber E. The throat sealing assembly can effectively prevent the material in the upper chamber F from overflowing from the pressure cover 18, and the material can only be discharged through the discharge port D. The amount of material output corresponds to the distance the driving connecting rod 14 moves.

[0048] While moving away from the feed valve assembly, the solenoid valve 22 opens, the air intake of the cylinder 1 pushes the piston rod 3 to move away from the feed adapter 21, the piston rod 3 releases the blockage of the feed port 6, the material body passes from the feed port A through the feed adapter 21 to the lower chamber E, and the feeding begins to prepare for the next feeding. If there is a leak between the sealing ball 9 and the drainage block 8, the pressure value of the outlet pressure sensor 20 will continue to decrease, and the pressure value of the pressure detection sensor 24 will continue to increase, so that the system determines that timely maintenance is required.

[0049] When the driving connecting rod 14 moves toward one side of the feed valve assembly, the solenoid valve 22 is closed in time, and the piston is pushed to move toward the feed adapter 21 under the force of the compressed elastic member 7, and the piston rod 3 re-blocks the feed port 6, so that the feed valve assembly changes from an open state to a closed state (the timely response of this process ensures that the piston has no invalid stroke during the movement toward the elastic member 7. The mechanical one-way valve used in the traditional metering pump has a long response time and there will be a period of invalid stroke, resulting in low metering accuracy of the equipment). The design of the feed valve assembly used in this embodiment ensures that when the driving connecting rod 14 moves toward one side of the feed valve assembly, the piston rod 3 can fit tightly with the feed port 6. At the same time, when the equipment is powered off and the air is cut off, the feed valve assembly will remain in a closed state under the force of the elastic member 7, avoiding the risk of leakage of the material in the pump body 12. When the driving connecting rod 14 moves toward the side of the feed valve assembly, the force in the lower chamber E is squeezed and increased, and the pressure in the upper chamber F is stretched and reduced. Since the pressure in the lower chamber E is greater than that in the upper chamber F, the sealing ball 9 and the drainage block 8 in the pump body 12 are forced to open, and the material in the pump body 12 moves from the lower chamber E to the upper chamber F. Since the volume of the lower chamber E is greater than that of the upper chamber F, part of the material in the lower chamber E is retained in the upper chamber F, and the other part is continuously output through the discharge joint 19. If there is a leak between the sealing piston rod 3 and the feed port 6, the pressure value of the pressure detection sensor 24 will continue to decrease, so that the system determines that timely maintenance is required.

[0050] For the above specific embodiments of the present embodiment, the purpose, technical solutions and beneficial effects of the present utility model are further described in detail. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0051] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0054] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0055] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A plunger type continuous metering pump, characterized in that: include: A pump assembly, comprising a pump body with a hollow cavity, and a driving connecting rod with one end inserted into the pump body and adapted to perform linear motion along the depth direction of the pump body; one end of the driving connecting rod is arranged on a positioning member; A one-way valve assembly, comprising a drainage block provided on the pump body and located on the side of the positioning member facing away from the driving connecting rod, a drainage port formed on the drainage block, a sealing ball suitable for blocking the drainage port, and a compression spring connected to one end of the sealing ball facing away from the drainage port; the positioning member is provided with a receiving groove suitable for the compression spring to be embedded; A feed valve assembly comprises a feed adapter arranged at the open end of the extended end of the pump body facing away from the driving connecting rod, a feed port arranged on the feed adapter and connected to the open end, and a valve body connected to the feed adapter; a cylinder is arranged in the valve body, and the piston rod of the cylinder is suitable for blocking the feed port.

2. The plunger type continuous metering pump according to claim 1, characterized in that: The valve body is also provided with an elastic member connected to one end of the piston rod facing away from the material passage opening.

3. The plunger type continuous metering pump according to claim 1 or 2, characterized in that: The cylinder is also connected to a solenoid valve for controlling its operating state.

4. The plunger type continuous metering pump according to claim 1 or 2, characterized in that: The side wall of the valve body is also provided with a feed port for charging material into the valve body; When the piston rod releases the blockage of the material passage, the feed port is communicated with the material passage so that the material entering the valve body through the feed port can enter the pump body through the material passage.

5. The plunger type continuous metering pump according to claim 1, characterized in that: The drainage block is also provided with a bucket-shaped limiting hole which is communicated with the drainage port and is suitable for embedding the sealing ball part.

6. The plunger type continuous metering pump according to claim 1, characterized in that: A discharge port communicating with the hollow cavity is also provided on the side wall of the pump body and on the side of the positioning member facing away from the one-way valve assembly; and The discharge port is provided with an outlet pressure sensor.

7. The plunger type continuous metering pump according to claim 1, characterized in that: The end of the pump body suitable for driving the connecting rod to extend is also provided with a throat sealing assembly.

8. The plunger type continuous metering pump according to claim 7, characterized in that: The throat sealing assembly comprises a throat base connected to the pump body, a sealing member arranged in the throat base, and a gland connected to an end of the throat base facing away from the pump body; wherein The sealing member and the gland are formed with a through hole suitable for the driving connecting rod to pass through; The driving connecting rod is sealingly matched with the inner wall of the through hole of the sealing component.

9. The plunger type continuous metering pump according to claim 4, characterized in that: The valve body is also provided with an isolating member that cooperates with the piston rod seal; the isolating member is used to prevent the material entering the valve body from the feed inlet from flowing into the cylinder; An oil injection block gasket and an oil injection lubricating block are arranged between the piston rod and the isolating piece.

10. The plunger type continuous metering pump according to claim 1, characterized in that: A pressure detection sensor is also provided in the pump body and on the side of the drainage block facing the feed valve assembly.

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