Liquid injection pump compensation device, liquid injection pump and control method of liquid injection pump

Abstract

The invention discloses a liquid injection pump compensation device, a liquid injection pump and a control method of the liquid injection pump, the liquid injection pump compensation device comprises a test chamber, the test chamber is hollow to form a test cavity, two opposite side wall surfaces of the test chamber are respectively provided with a liquid inlet and a liquid outlet, and the upper end of the test chamber is provided with a mounting block; the pressure sensor is connected with the mounting block, the sensing end of the pressure sensor extends into the test cavity, and the pressure sensor is used for collecting the real-time pressure value of the liquid in the test cavity; the temperature sensor is connected with the mounting block, the sensing end of the temperature sensor extends into the test cavity, and the temperature sensor is used for collecting the real-time temperature value of the liquid in the test cavity; the controller is electrically connected with the pressure sensor and the temperature sensor; and the display screen is electrically connected with the controller and is used for displaying a change curve of the real-time pressure value and a change curve of the real-time temperature value. The liquid pressure and temperature can be monitored so as to ensure that the filling amount is qualified.

Description

Technical Field

[0001] The present invention relates to the technical field of filling equipment, in particular to a liquid injection pump compensation device, a liquid injection pump and a control method thereof. Background Art

[0002] During the production and processing of filling products using a liquid injection pump, the pressure of the liquid passing through the liquid injection pump may be affected by factors such as the opening degree of the liquid outlet valve, and its temperature may be affected by factors such as the environment. However, it is difficult for operators to monitor the internal situation of the liquid injection pump. For changes in the pressure or temperature of the liquid inside the liquid injection pump, operators cannot timely learn and take corresponding adjustment measures. Since the liquid outlet valve of the liquid outlet pipeline of the liquid injection pump fails to open completely, the liquid pressure increases, which may cause inaccurate filling volume, and even the pump body of the liquid injection pump may be stuck in rotation and the pipeline may be damaged. And the density of the liquid changes at different temperatures. The liquid density is proportional to the mass. When the liquid injection pump performs equal-volume liquid filling, the change in temperature will cause the product weight fluctuation not to meet the technical requirements, and even cause a large number of products to be scrapped. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a liquid injection pump compensation device, a liquid injection pump and a control method thereof.

[0004] The solution for the present invention to solve its technical problems is as follows: In the first aspect, a liquid injection pump compensation device is provided, which is applied to the inlet or outlet of a liquid injection pump. The liquid injection pump compensation device includes: A test chamber, which is hollow to form a test cavity. Liquid inlet and outlet ports are respectively provided on two opposite side walls of the test chamber, and a mounting block is provided at the upper end of the test chamber; A pressure sensor, which is connected to the mounting block. The sensing end of the pressure sensor extends into the test cavity, and the pressure sensor is used to collect the real-time pressure value of the liquid in the test cavity; A temperature sensor, which is connected to the mounting block. The sensing end of the temperature sensor extends into the test cavity, and the temperature sensor is used to collect the real-time temperature value of the liquid in the test cavity; A controller, which is electrically connected to the pressure sensor and the temperature sensor respectively; A display screen, which is electrically connected to the controller, and the display screen is used to display the change curve of the real-time pressure value and the change curve of the real-time temperature value.

[0005] The present invention has at least the following beneficial effects: After the liquid enters the test chamber from the liquid inlet and flows out through the liquid outlet, during the process of the liquid entering the test chamber, the pressure sensor can collect the real-time pressure value of the liquid and transmit the signal to the controller, while the temperature sensor can collect the real-time temperature value of the liquid and transmit the signal to the controller. The controller controls the display screen to display the change curve of the real-time pressure value and the change curve of the real-time temperature value of the liquid according to the real-time pressure value and the real-time temperature value. The operator can learn about the pressure change and temperature change of the liquid through the display screen, realizing the monitoring of the liquid pressure and temperature; The operator can judge whether there is a fault in the liquid outlet pipeline in the liquid injection pump according to the pressure change, and remove the fault in time, avoiding the situation that the pump body of the liquid injection pump rotates and jams and the pipeline is damaged, and also avoiding the influence of the pressure change on the accuracy of the filling volume; The temperature change will affect the liquid density. By monitoring the temperature of the liquid through the temperature sensor, the liquid density can be determined according to the real-time temperature value, so as to adjust the liquid outlet volume to ensure that the filling quality meets the technical requirements and improve the qualified rate of the filling products.

[0006] As a further improvement of the above technical solution, an inlet pipe is provided in the test chamber. The inlet pipe includes a horizontal diversion section and a vertical diversion section. The horizontal diversion section is connected to the side wall surface of the test chamber. The inlet end of the horizontal diversion section is the liquid inlet. The outlet end of the horizontal diversion section is connected to the inlet end of the vertical diversion section. The outlet end of the vertical diversion section is opened upward. The sensing end of the pressure sensor is arranged facing the outlet end of the vertical diversion section, and there is a flow gap between the sensing end and the outlet end of the vertical diversion section. The flow gap communicates with the test chamber.

[0007] As a further improvement of the above technical solution, the liquid outlet is provided in the upper part of the test chamber, and the sensing end of the temperature sensor extends downward to the middle part of the test chamber.

[0008] As a further improvement of the above technical solution, the liquid injection pump compensation device further includes: An alarm, which is electrically connected to the controller. When the real-time pressure value is higher than the preset pressure threshold, the controller controls the alarm to give an alarm.

[0009] As a further improvement of the above technical solution, the liquid injection pump compensation device further includes: A protective cover is arranged above the mounting block. The protective cover is hollow to form a protection chamber. The pressure sensor and the temperature sensor are respectively arranged in the protection chamber.

[0010] As a further improvement of the above technical solution, the protective cover is detachably connected to the mounting block.

[0011] As a further improvement of the above technical solution, the pressure sensor and the temperature sensor are respectively detachably connected to the mounting block.

[0012] In a second aspect, a liquid injection pump is proposed, which includes the liquid injection pump compensation device described in any one of the above technical solutions. Since the liquid injection pump is provided with the liquid injection pump compensation device, when the liquid injection pump is performing the filling operation, the operator can timely learn about the state of the liquid injection pump and the liquid inside it through the display screen, which is beneficial to monitoring the filling volume and improving the qualification rate of the filled products.

[0013] In a third aspect, a control method for a liquid injection pump is proposed, which is applied to a liquid injection pump. The liquid injection pump includes a pump body and the liquid injection pump compensation device described in any one of the above technical solutions. The liquid injection pump compensation device is arranged at the inlet or outlet of the pump body. The control method includes the following steps: Obtain the real-time temperature value of the liquid; Adjust the liquid output volume of the pump body according to the real-time temperature value.

[0014] By automatically adjusting the liquid output volume of the liquid injection pump through the implementation of the temperature value, it can ensure that the weight of the filled product meets the technical requirements and improve the qualification rate of the product.

[0015] As a further improvement of the above technical solution, the step of adjusting the liquid output volume of the pump body according to the real-time temperature value includes the following steps: Obtain the liquid density according to the real-time temperature value; Calculate the filling volume according to the liquid density and the preset injection volume; Control the pump body to increase or decrease the liquid output volume according to the filling volume. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0017] Figure 1 is the overall structural schematic diagram of the liquid injection pump compensation device according to the embodiment of the present invention; Figure 2 is the overall structural schematic diagram of the liquid injection pump compensation device from another angle according to the embodiment of the present invention; Figure 3 is the front view of the liquid injection pump compensation device according to the embodiment of the present invention; Figure 4 is the left view of the liquid injection pump compensation device according to the embodiment of the present invention; Figure 5 is Figure 4 a cross-sectional view taken along the A-A direction in Figure 6 is a control flowchart of a control method for a liquid injection pump according to an embodiment of the present invention; Figure 7 is Figure 6 a refined flowchart of step S700 in Figure 8 is a control flowchart of a control method for a liquid injection pump according to another embodiment of the present invention; Figure 9 is a control flowchart of a control method for a liquid injection pump according to another embodiment of the present invention.

[0018] Reference numerals: 100, test chamber; 110, liquid inlet; 111, connector; 112, liquid inlet pipe; 120, liquid outlet; 130, end cap; 131, second sealing ring; 140, test body; 150, test cavity; 200, mounting block; 300, protective cover; 310, protection cavity; 400, pressure sensor; 500, temperature sensor. Detailed Description of the Invention

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] In the description of the present invention, the orientation descriptions such as up, down, front, back, left, right, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0021] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence relationship of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0023] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts all fall within the scope of protection of the present invention. Each technical feature in the present invention can be combined interactively on the premise of not conflicting with each other.

[0024] In a first aspect, referring to Figures 1 to 5 , an embodiment of the present invention provides a liquid injection pump compensation device, which is applied to the inlet or outlet of a liquid injection pump, can assist the liquid injection pump in the filling work, enables the operator to timely learn about the state of the liquid injection pump and the liquid inside it, is beneficial to monitoring the filling volume, and improves the qualification rate of the filled products.

[0025] In this embodiment, the liquid injection pump compensation device includes a test chamber 100, a pressure sensor 400, a temperature sensor 500, a controller, and a display screen. The test chamber 100 is hollow to form a test cavity 150. Two opposite side wall surfaces of the test chamber 100 are respectively provided with a liquid inlet 110 and a liquid outlet 120. After the liquid for filling enters the test cavity 150 from the liquid inlet 110, it flows out from the liquid outlet 120. An installation block 200 is provided at the upper end of the test chamber 100. The pressure sensor 400 and the temperature sensor 500 are respectively connected to the installation block 200. Moreover, the sensing end of the pressure sensor 400 passes through the upper wall surface of the test cavity 150 and extends into the test cavity 150, and the sensing end of the temperature sensor 500 passes through the upper wall surface of the test cavity 150 and extends into the test cavity 150.

[0026] In this embodiment, the display screen is electrically connected to the controller. The pressure sensor 400 is used to collect the real-time pressure value of the liquid inside the test cavity 150, and it is electrically connected to the controller. After the pressure sensor 400 collects the real-time pressure value of the liquid in the test cavity 150, it can transmit the signal to the controller. The controller obtains the change curve of the real-time pressure value of the liquid in the test cavity 150 according to the real-time pressure value and displays the change curve of the real-time pressure value through the display screen. The temperature sensor 500 is used to collect the real-time temperature value of the liquid inside the test cavity 150, and it is electrically connected to the controller. After the temperature sensor 500 collects the real-time temperature value of the liquid in the test cavity 150, it can transmit the signal to the controller. The controller obtains the change curve of the real-time temperature value of the liquid in the test cavity 150 according to the real-time temperature value and displays the change curve of the real-time temperature value through the display screen.

[0027] It is understandable that the display screen displays the change curve of the real-time pressure value in real time. The operator can view through the display screen whether the liquid injection and filling process is stable, and judge whether there is a fault in the liquid outlet pipeline through the change curve of the real-time pressure value. When the liquid outlet valve of the liquid outlet pipeline of the liquid injection pump is not fully opened, the pressure of the liquid in the test chamber 150 rises. The operator can timely learn about the pressure change of the liquid from the change curve of the real-time pressure value displayed on the display screen, so as to check the liquid outlet valve of the liquid injection pump, eliminate the filling volume error caused by the pressure change, and avoid the situation that the pump body of the liquid injection pump rotates and jams and the pipeline is damaged.

[0028] In this embodiment, the liquid injection pump is a positive displacement pump, and its filling volume depends on the volume of the liquid. When the density of the liquid changes, even if the volume output of the liquid injection pump remains unchanged, its mass output will change. It is understandable that the density of the liquid will change with the change of temperature: when the temperature rises, the density of the liquid will decrease; conversely, when the temperature drops, the density of the liquid will increase. And this density change caused by temperature will affect the filling volume of the liquid injection pump. The display screen displays the change curve of the real-time temperature value at the inlet or outlet of the liquid injection pump in real time, which can monitor the fluctuation of the liquid temperature within a reasonable range during the whole liquid injection and filling process, and avoid the weight error of the filled product exceeding the reasonable range due to out-of-range fluctuation. When the temperature of the liquid changes greatly, the error between the liquid density and the preset density is too large. The operator can timely learn about the temperature change of the liquid from the change curve of the real-time temperature value displayed on the display screen, and the liquid injection pump can determine the density of the liquid according to the temperature change, automatically adjust the liquid outlet volume of the liquid injection pump according to the newly determined density, and realize automatic compensation to ensure that the weight of the filled product is within the preset range, meet the technical requirements, and improve the qualification rate of product production.

[0029] It is understandable that since the liquid injection pump compensation device is applied to the inlet or outlet of the liquid injection pump, the test chamber 100 is connected to the outlet or inlet of the liquid injection pump body, and the liquid temperature tested in the test chamber 150 is infinitely close to the temperature of the pump body volume chamber, effectively avoiding a large amount of heat exchange of the medium, thereby avoiding the situation that the test temperature is inconsistent with the temperature of the volume chamber that determines the final liquid injection volume of the liquid.

[0030] In some embodiments, referring to Figure 5 , the pressure sensor 400 is arranged on one side close to the liquid inlet 110, and the temperature sensor 500 is arranged on one side close to the liquid outlet 120. With such an arrangement, the installation of the pressure sensor 400 and the temperature sensor 500 is more reasonable. The pressure sensor 400 can timely learn about the pressure when the liquid enters the test chamber 150, and after the liquid completely enters the test chamber 150, the temperature sensor 500 collects the temperature of the liquid, making the temperature monitoring of the temperature sensor 500 more accurate.

[0031] In some embodiments, a liquid inlet pipe 112 is disposed in the test chamber 150. The liquid inlet pipe 112 is in an "L" shape and includes two diversion sections perpendicular to each other, namely a horizontal diversion section and a vertical diversion section. The horizontal diversion section is connected to the side wall surface of the test chamber 150. The inlet end of the horizontal diversion section is the liquid inlet 110 of the test chamber 150. The outlet end of the horizontal diversion section is connected to the inlet end of the vertical diversion section. The outlet end of the vertical diversion section is opened upward. The sensing end of the pressure sensor 400 is arranged facing the outlet end of the vertical diversion section. Moreover, there is a flow gap between the sensing end of the pressure sensor 400 and the outlet end of the vertical diversion section. The lumen of the liquid inlet pipe 112 communicates with the test chamber 150 through this flow gap.

[0032] It can be understood that the liquid enters the test chamber 100 through the horizontal diversion section and flows along the liquid inlet pipe 112 to the flow gap, so that the sensing end of the pressure sensor 400 can monitor the pressure of the liquid. After the liquid flows through the flow gap, it enters the test chamber 150. Since the space in the test chamber 150 is larger than that of the pipeline, the test chamber 150 can store the liquid, which can reduce the heat exchange between the liquid and the outside world, enabling the temperature sensor 500 to accurately measure the temperature with a time delay and ensuring the accuracy of the test.

[0033] In some embodiments, the liquid outlet 120 is disposed at the upper part of the test chamber 150, and the sensing end of the temperature sensor 500 extends downward to the middle position of the test chamber 150. With such an arrangement, the sensing end of the temperature sensor 500 can be completely immersed in the liquid in the test chamber 150, making the temperature monitoring of the liquid more accurate.

[0034] In some embodiments, the liquid injection pump compensation device further includes an alarm for issuing an alarm to timely remind the operator of an abnormal situation of the liquid injection pump. It can be understood that the alarm is electrically connected to the controller. When the real-time pressure value transmitted by the pressure sensor 400 to the controller is higher than the preset pressure threshold, the controller confirms that a fault has occurred in the liquid outlet pipeline of the pump body, and the controller controls the alarm to issue an alarm.

[0035] Due to the incompressibility of the liquid, in a system operating in a stable cycle, the pressure in the pipeline shows a stable periodic change. When external factors change, the pressure will change significantly. According to this characteristic, the liquid outlet pipeline system can be monitored. When a fault occurs in the pipeline or it is affected externally, the pressure will change significantly, and the controller will promptly give an alarm about this fault according to the signal output by the pressure sensor 400.

[0036] It can be understood that the alarm can be a component that emits an alarm through sound, such as a buzzer, or a component that emits an alarm through visual cues, such as an indicator light. In some embodiments, the alarm emits an alarm by combining sound and light. It includes a buzzer and an indicator light. When the real-time pressure value collected by the pressure sensor 400 is higher than the preset pressure threshold, the buzzer emits a sharp alarm sound, and the color of the indicator light changes from green to red.

[0037] In some embodiments, the liquid injection pump compensation device further includes a protective cover 300. The protective cover 300 is disposed above the mounting block 200 and is hollow to form a protection cavity 310. The pressure sensor 400 and the temperature sensor 500 are respectively disposed in the protection cavity 310. It can be understood that the protection cavity 310 provides an installation space for the pressure sensor 400 and the temperature sensor 500. The protective cover 300 can provide protection for the pressure sensor 400 and the temperature sensor 500, improve the service life of the pressure sensor 400 and the temperature sensor 500, and reduce the influence of external environmental factors on the pressure sensor 400 and the temperature sensor 500, thereby improving the test accuracy of the pressure sensor 400 and the temperature sensor 500.

[0038] In this embodiment, both the pressure sensor 400 and the temperature sensor 500 are connected to an external power supply component through cables. Two wire passing holes are provided on the upper end surface of the protective cover 300. The two wire passing holes are respectively communicated with the protection cavity 310. The cable connecting the pressure sensor 400 and the cable connecting the temperature sensor 500 respectively pass through the two wire passing holes to the outside of the protective cover 300, so as to be electrically connected to an external power supply component.

[0039] In some embodiments, the protective cover 300 is detachably connected to the mounting block 200. By removing the protective cover 300, the pressure sensor 400 and the temperature sensor 500 can be exposed, so as to facilitate the maintenance of the pressure sensor 400 and the temperature sensor 500.

[0040] It can be understood that the protective cover 300 and the mounting block 200 can be connected by screws or can be detachably connected by buckles. The specific connection method between the protective cover 300 and the mounting block 200 is not limited herein.

[0041] In some embodiments, the pressure sensor 400 is detachably connected to the mounting block 200, and the temperature sensor 500 is detachably connected to the mounting block 200. After opening the protective cover 300 and removing the pressure sensor 400 and the temperature sensor 500 from the mounting block 200, it is more convenient to maintain or replace the pressure sensor 400 and the temperature sensor 500. In the case where one of the components is damaged, only the damaged component can be replaced without discarding the entire liquid injection pump compensation device.

[0042] It is understandable that the pressure sensor 400 and the temperature sensor 500 can be connected to the mounting block 200 by screws or by snap connections. In some embodiments, an external thread structure is provided on the lower outer periphery of the pressure sensor 400 and the temperature sensor 500, and a mounting hole with an internal thread structure is provided on the mounting block 200. Through the cooperation of the external thread structure and the internal thread structure, the pressure sensor 400 and the temperature sensor 500 are detachably mounted on the mounting block 200.

[0043] It is understandable that attention should be paid to the sealing performance of the connection between the pressure sensor 400 and the mounting block 200 and the connection between the temperature sensor 500 and the mounting block 200. In some embodiments, a first sealing ring is provided at the connection between the pressure sensor 400 and the mounting block 200 and at the connection between the temperature sensor 500 and the mounting block 200 to improve the sealing performance of the connection and avoid the leakage of the liquid in the test chamber 150.

[0044] In some embodiments, the mounting block 200 is detachably connected to the test chamber 100. It is understandable that the mounting block 200 and the test chamber 100 can be detachably connected by means of screws, snap connections, etc., and no specific limitation is made here. Such a setting is more conducive to the production and processing of the test chamber 100 and the mounting block 200, and reduces the difficulty of the production and processing of the liquid injection pump compensation device.

[0045] In some embodiments, referring to Figure 5 , the test chamber 100 includes an end cap 130 and a test main body 140. The end cap 130 and the test main body 140 are detachably connected. When the end cap 130 is connected to the test main body 140, the end cap 130 and the test main body 140 together form a test chamber 150. In this embodiment, the liquid outlet 120 is provided at the end cap 130, and the liquid inlet pipe 112 is connected to the end cap 130.

[0046] It is understandable that by providing a split structure of the end cap 130 and the test main body 140, it is convenient for the operator to regularly open the test chamber 150 for cleaning and maintenance.

[0047] In this embodiment, a first sealing groove is provided on the side surface of the end cap 130 facing the test chamber 150, and a second sealing ring 131 is installed in the first sealing groove. When the end face of the end cap 130 is connected to the end face of the test main body 140, the second sealing ring 131 fits on the end face of the test main body 140 to ensure the sealing performance of the connection between the end cap 130 and the test main body 140 and avoid the leakage of the liquid in the test chamber 150 through the connection between the end cap 130 and the test main body 140.

[0048] It can be understood that the end cap 130 and the test body 140 can be connected by screws or can be detachably connected by means such as snap fasteners, and specific limitations are not made here.

[0049] In some embodiments, referring to Figure 1 , Figure 3 and Figure 5 , a connector 111 is provided on the outer wall surface of the test chamber 100, and the liquid inlet 110 penetrates through the connector 111. In some embodiments, the liquid inlet pipe 112 penetrates through the end cap 130, and the inlet end of the liquid inlet pipe 112 forms a protruding connector 111. It can be understood that the connector 111 protrudes from the outer wall surface of the test chamber 100, which is more convenient for docking with the outlet of the pump body.

[0050] In some embodiments, a second sealing groove is provided on the outer periphery of the connector 111, and a third sealing ring can be placed. When the connector 111 is connected to other pipes, the third sealing ring can improve the sealing performance of the connection and avoid the situation of liquid seeping out from the connection.

[0051] In some embodiments, a third sealing groove is provided on the outer periphery of the liquid outlet 120, and a fourth sealing ring can be placed. When the liquid outlet 120 is connected to other pipes, the fourth sealing ring can improve the sealing performance of the connection and avoid the situation of liquid seeping out from the connection.

[0052] In a second aspect, an embodiment of the present invention provides a liquid injection pump, which has the liquid injection pump compensation device proposed in any one of the embodiments of the first aspect. The liquid injection pump further includes a pump body, and the liquid injection pump compensation device is connected to the inlet or outlet of the pump body. Due to the provision of the liquid injection pump compensation device, when the liquid injection pump is performing filling work, the operator can timely learn about the state of the liquid injection pump and the liquid inside it, which is beneficial to monitoring the filling volume and improving the qualification rate of the filled products.

[0053] It can be understood that since the liquid injection pump compensation device is installed at the inlet or outlet of the pump body, the real-time temperature value measured by the temperature sensor 500 is infinitely close to the temperature in the volume chamber of the pump body, effectively avoiding a large amount of heat exchange of the medium, thereby avoiding the situation where the measured temperature is inconsistent with the temperature in the volume chamber that determines the final liquid injection volume. Secondly, the space in the test chamber 150 is larger than the space in the pipeline, which can further reduce the heat exchange of the liquid, thereby ensuring accurate testing and avoiding the compensation distortion caused by the installation space limitation of the temperature sensor 500.

[0054] When using the liquid injection pump of this embodiment, the operator can view whether the liquid injection filling process is stable through the display screen, and can judge whether there is a fault in the liquid outlet pipeline through the change curve of the real-time pressure value, and monitor the fluctuation of the liquid temperature within a reasonable range during the entire liquid injection filling process, avoiding the weight error of the filled products exceeding the reasonable range due to out-of-range fluctuations.

[0055] In some embodiments, the controller of the liquid injection pump compensation device is electrically connected to the pump body. The controller finely adjusts the filling volume of the pump body according to the real-time temperature value collected by the temperature sensor 500. Specifically, the temperature sensor 500 measures the real-time temperature value of the liquid in the test chamber 150, and the controller adjusts the density parameter according to the density change amount of the liquid per unit temperature. The controller calculates the corresponding volume V by dividing the set liquid injection volume M by the density P. When the liquid temperature changes, the controller calculates the new density parameter P1 according to the relationship between temperature and density, and then divides M by the new density P1 to obtain the final filling volume V1, so as to always ensure that the mass M is always consistent. It can be understood that the fine adjustment according to the temperature change will not affect the detection of the pressure sensor 400.

[0056] The temperature sensor 500 measures the change in the liquid temperature. The controller compensates the final liquid injection volume according to the relationship between temperature and liquid density. However, the increase in the temperature of the liquid outlet pipeline will cause the pressure in the liquid outlet pipeline to rise, and the rising pressure will cause the first group of liquid injection volumes at the start of liquid injection to be excessive. The pressure and the excessive amount are linearly related. At this time, the controller can obtain the real-time pressure value measured by the pressure sensor 400 and compensate the first group of liquid injection volumes according to the magnitude of the pressure change, so as to further ensure that the liquid injection volume is constant throughout the liquid injection process.

[0057] In the embodiments provided with an alarm, when a fault occurs in the pipeline or it is affected externally, the pressure will change greatly. The controller gives a warning about this fault in time according to the signal output by the pressure sensor 400. In some embodiments, when the real-time pressure value exceeds the preset pressure threshold, in addition to being able to issue an alarm through the alarm, the controller can also control the pump body to stop running to avoid damage to the pump body.

[0058] In a third aspect, an embodiment of the present invention also provides a control method for a liquid injection pump, which is applied to the liquid injection pump and can adjust and monitor the liquid outlet volume of the liquid injection pump in real time. By automatically adjusting the liquid outlet volume of the liquid injection pump through the control method of this embodiment, it can ensure that the weight of the filled product meets the technical requirements and improve the qualified rate of the product.

[0059] In this embodiment, the liquid injection pump includes a pump body and a liquid injection pump compensation device. The liquid injection pump compensation device is arranged at the inlet or outlet of the pump body. The control method of the liquid injection pump includes step S600 and step S700. Refer to Figure 6 。

[0060] Step S600, obtaining the real-time temperature value of the liquid. It can be understood that the real-time temperature value is obtained through the temperature sensor 500.

[0061] Step S700: Adjust the liquid output volume of the pump body according to the real-time temperature value. Automatically adjusting the liquid output volume of the liquid injection pump according to the real-time temperature value can ensure that the weight of the filled product meets the technical requirements and improve the qualified rate of the product.

[0062] In some embodiments, step S700 includes step S710, step S720, and step S730. Refer to Figure 7 .

[0063] Step S710: Obtain the liquid density according to the real-time temperature value. It can be understood that the liquid density will change with the change of temperature. When the temperature rises, the liquid density will decrease; conversely, when the temperature drops, the liquid density will increase. According to the collected real-time temperature value and referring to the relationship curve between temperature and liquid density, the real-time liquid density can be obtained.

[0064] Step S720: Calculate the filling volume based on the liquid density and the preset liquid injection volume. It can be understood that the weight required for the filled product remains unchanged, and the weight of the filled product needs to be maintained within the preset range. Filled products with weights higher or lower than the preset range are unqualified products. According to the required mass of the filled product and the calculation formula for mass m, filling volume V, and liquid density ρ, the required filling volume can be obtained.

[0065] The calculation formula is: .

[0066] Step S730: Control the pump body to increase or decrease the liquid output volume according to the filling volume. It can be understood that the pump body in this embodiment is a positive displacement pump. By controlling the liquid output volume according to the required filling volume, filled products that are qualified in terms of weight can be obtained.

[0067] It can be understood that the liquid output volume of the pump body can be achieved by controlling the opening and closing time of the liquid output valve of the pump body.

[0068] It can be understood that by controlling the liquid injection pump through the above control method, the influence of temperature on the weight of the filled product is avoided, and the error of manual adjustment of the filling volume by the operator can also be avoided. The qualified rate of the filled products produced by the liquid injection pump is high.

[0069] In some embodiments, the control method of the liquid injection pump further includes step S810 and step S820. Refer to Figure 8 .

[0070] Step S810: Obtain the real-time pressure value of the liquid. In this embodiment, the real-time pressure value is obtained by the pressure sensor 400.

[0071] Step S820: Control the display screen to display the change curve of the real-time pressure value according to the real-time pressure value.

[0072] It is understandable that by controlling the display screen to display the change curve of the real-time pressure value in real time, the operator can view through the display screen whether the liquid injection and filling process is stable, judge whether there is a fault in the liquid outlet pipeline through the change curve of the real-time pressure value, and process the fault in a timely manner.

[0073] In some embodiments, the liquid injection pump further includes an alarm, and the control method of the liquid injection pump further includes step S830.

[0074] Step S830, when the real-time pressure value is greater than the preset pressure threshold, control the alarm to give an alarm. It is understandable that the alarm is electrically connected to the controller. When the real-time pressure value transmitted by the pressure sensor 400 to the controller is higher than the preset pressure threshold, the controller confirms that there is a fault in the liquid outlet pipeline of the pump body, and the controller controls the alarm to give an alarm. The alarm can be a component that gives an alarm through sound such as a buzzer, or a component that gives an alarm through visual prompts such as an indicator light. In some embodiments, the alarm gives an alarm in a combination of sound and light, which includes a buzzer and an indicator light. When the real-time pressure value collected by the pressure sensor 400 is higher than the preset pressure threshold, the buzzer gives a sharp alarm sound, and the color of the indicator light changes from green to red.

[0075] By executing steps S810 to S830, the operator can timely learn about the abnormal conditions of the liquid injection pump, such as the blockage of the liquid outlet valve, etc., so as to be able to check the liquid injection pump, eliminate the filling volume error caused by the pressure change, and avoid the situation that the pump body of the liquid injection pump rotates and jams and the pipeline is damaged.

[0076] In some embodiments, after executing step S600, the control method of the liquid injection pump further includes step S900, refer to Figure 9 .

[0077] Step S900, control the display screen to display the change curve of the real-time temperature value according to the real-time temperature value.

[0078] By controlling the display screen to display the change curve of the real-time temperature value at the inlet or outlet of the pump body in real time, the operator can monitor the fluctuation of the liquid temperature within a reasonable range during the entire liquid injection and filling process, avoid the weight error of the filled product exceeding the reasonable range due to out-of-range fluctuation, and further improve the qualified rate of the product.

[0079] The embodiment of the present invention also provides a control device for a liquid injection pump, including a memory, a processor, and a program stored on the memory and executable on the processor. When the program is executed by the processor, the control method of the above embodiment is implemented.

[0080] Take the example where the processor and memory of the control device of the liquid injection pump are connected via a bus. As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk memory, flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory may optionally include a memory remotely set relative to the control processor, and these remote memories can be connected to the control device via a network.

[0081] The non-transitory software programs and instructions required to implement the control method of the above embodiments are stored in the memory, and when executed by the processor, the control method in the above embodiments is executed. For example, execute Figure 6 the method steps S600 to step S700 in Figure 7 the method steps S710 to step S730 in Figure 8 the method steps S810 to step S830 in Figure 9 the method steps S900, etc. in

[0082] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A liquid injection pump compensation device, characterized in that: Applied to the inlet or outlet of the injection pump, the injection pump compensation device comprises: A test chamber is hollow to form a test cavity, and opposite side walls of the test chamber are respectively provided with a liquid inlet and a liquid outlet, and an upper end of the test chamber is provided with a mounting block; A pressure sensor connected to the mounting block, wherein the sensing end of the pressure sensor extends into the test cavity, and the pressure sensor is used to collect the real-time pressure value of the liquid in the test cavity; A temperature sensor connected to the mounting block, wherein the sensing end of the temperature sensor extends into the test cavity, and the temperature sensor is used to collect the real-time temperature value of the liquid in the test cavity; a controller, electrically connected to the pressure sensor and the temperature sensor respectively; A display screen is electrically connected to the controller, and is used to display a change curve of the real-time pressure value and a change curve of the real-time temperature value.

2. The liquid injection pump compensation device according to claim 1, characterized in that: A liquid inlet pipe is provided in the test cavity, and the liquid inlet pipe includes a horizontal guide section and a vertical guide section. The horizontal guide section is connected to the side wall surface of the test cavity, the inlet end of the horizontal guide section is the liquid inlet, the outlet end of the horizontal guide section is connected to the inlet end of the vertical guide section, the outlet end of the vertical guide section is opened upward, the sensing end of the pressure sensor is arranged toward the outlet end of the vertical guide section, and a flow gap is provided between the sensing end of the pressure sensor and the outlet end of the vertical guide section, and the flow gap is communicated with the test cavity.

3. The liquid injection pump compensation device according to claim 1, characterized in that: The liquid outlet is arranged at the upper part of the test cavity, and the sensing end of the temperature sensor extends downward to the middle part of the test cavity.

4. The liquid injection pump compensation device according to claim 1, characterized in that: The liquid injection pump compensation device also includes: An alarm is electrically connected to the controller, and when the real-time pressure value is higher than a preset pressure threshold, the controller controls the alarm to sound an alarm.

5. The liquid injection pump compensation device according to claim 1, characterized in that: The liquid injection pump compensation device also includes: A protective cover is arranged above the mounting block, the protective cover is hollow to form a protective cavity, and the pressure sensor and the temperature sensor are respectively arranged in the protective cavity.

6. The liquid injection pump compensation device according to claim 5, characterized in that: The protective cover is detachably connected to the mounting block.

7. The liquid injection pump compensation device according to claim 6, characterized in that: The pressure sensor and the temperature sensor are detachably connected to the mounting block, respectively.

8. A liquid injection pump, characterized in that: Comprising an injection pump compensation device as described in any one of claims 1 to 7.

9. A method for controlling a liquid injection pump, characterized in that: Applied to an injection pump, the injection pump comprises a pump body and an injection pump compensation device according to any one of claims 1 to 7, the injection pump compensation device is arranged at the inlet or outlet of the pump body, and the control method comprises the following steps: Get the real-time pressure and temperature values ​​of the liquid; The liquid output of the pump body is adjusted according to the real-time temperature value.

10. The control method of the liquid injection pump according to claim 9, characterized in that: The step of adjusting the liquid output of the pump body according to the real-time temperature value comprises the following steps: Acquire liquid density according to the real-time temperature value; Calculating the filling volume according to the liquid density and the preset liquid injection volume; The pump body is controlled to increase or decrease the liquid output according to the filling volume.

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