Intelligent liquid metering pump

Abstract

According to the intelligent liquid metering pump, the detachable feeding valve body and the detachable discharging valve body are arranged, so that the valve element is convenient to disassemble and assemble; the linear moving mechanism is matched with the metering piston head through a floating joint, so that the problem of dislocation occurring when the linear moving mechanism is connected with the metering piston head is solved; when the coaxiality of the linear moving mechanism and the metering piston head is inconsistent, the thrust applied to the metering piston head by the linear moving mechanism is not reduced, so that the normal movement of the metering piston head in the metering piston cylinder is ensured; therefore, the output quantity of liquid in the metering pump is not influenced.

Description

Technical Field

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

[0002] A metering pump, also known as a quantitative pump or a proportional pump, is a pump specifically used for metering and conveying fluids. It relies on the reciprocating motion of the piston in the cylinder to change the volume of the sealed working chamber to achieve fluid delivery. A patent document with application number 202022584180.6 in China and announcement date 2021.8.3 discloses a linear intelligent metering pump, including a metering pump body, a bottom plate, a motor, and a liquid injection cavity. The motor is arranged on the bottom plate, a guide rail is installed on the bottom plate, and a sliding seat that slides with the guide rail is arranged on the guide rail. The drive shaft of the motor is connected to a ball screw, one end of the ball screw is connected to a ceramic core, and a through hole is arranged on the sliding seat, and the ceramic core passes through the through hole to connect to the liquid injection cavity.

[0003] The ceramic core of the metering pump is connected to and driven by the ball screw, and the ceramic core is not convenient to disassemble and assemble. At the same time, since the ball screw is directly connected to the ceramic core, misalignment problems are likely to occur between the ball screw and the ceramic core, which will lead to a decrease in the coaxiality between the ball screw and the ceramic core. In this way, the thrust applied by the ball screw to the ceramic core will be reduced, and the stroke of the ceramic core will be shortened, which will reduce the output of the liquid in the metering pump. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a liquid intelligent metering pump, which is equipped with a detachable feed valve body and a discharge valve body to facilitate the disassembly and assembly of the valve core; the linear moving mechanism and the metering piston head are matched through a floating joint to eliminate the misalignment problem when the linear moving mechanism is connected to the metering piston head; when the coaxiality of the linear moving mechanism and the metering piston head is inconsistent, the thrust applied by the linear moving mechanism to the metering piston head will not be reduced, thereby ensuring the normal movement of the metering piston head in the metering piston cylinder; thereby, the output of the liquid in the metering pump will not be affected.

[0005] In order to solve the above technical problems, the technical solution used in the utility model is:

[0006] A liquid intelligent metering pump comprises a valve mechanism, a metering piston cylinder and a linear movement mechanism connected in sequence, wherein the valve mechanism comprises a valve seat, a cavity is provided in the valve seat, the cavity is communicated with the metering piston cylinder, a metering piston head is provided in the metering piston cylinder, and a floating joint is also provided, and the linear movement mechanism is connected to the metering piston head via the floating joint; a detachable feed valve body and a detachable discharge valve body are provided on the valve seat; a feed valve core is provided in the feed valve body, and the feed valve core is used to control the on-off of the fluid input in the valve seat; a discharge valve core is provided in the discharge valve body, and the discharge valve body is used to control the on-off of the fluid output in the valve seat; a feed valve core is provided in the feed valve body, and the feed valve core comprises a valve core body and two or more extension parts, the two or more extension parts are arranged around the valve core body, and a gap is formed between adjacent extension parts, and the gap is arranged along the length direction of the valve core body.

[0007] Preferably, the linear motion mechanism includes a motor, a coupling, a bearing seat, a ball screw, a lock nut and a connecting piece; a bearing is provided in the bearing seat, the ball screw is passed through the bearing, one end of the ball screw is connected to the motor through the coupling, the other end of the ball screw is connected to the lock nut, and the lock nut is connected to the floating joint through the connecting piece.

[0008] Preferably, a main seat is provided between the metering piston cylinder and the linear moving mechanism, the motor is fixedly connected to the main seat, the connecting piece is movably arranged in the main seat, one end of the connecting piece passes through the main seat and is connected to the floating joint, and a sealing ring is provided between the connecting piece and the main seat.

[0009] Preferably, a sleeve is provided at one end of the main seat away from the linear moving mechanism, the sleeve is sleeved on the outside of the metering piston cylinder, a cavity is formed between the metering piston cylinder, the main seat and the sleeve, and an observation window corresponding to the position of the cavity is provided on the sleeve.

[0010] Preferably, the feed valve body is provided with a feed port, the accommodating cavity is connected with a feed channel, and the feed valve core is connected with the feed port and the feed channel; an annular feed stopper is provided on the feed valve core, and the cross-sectional area of ​​the feed stopper is larger than the cross-sectional area of ​​the feed port; the elastic reset member is sleeved on the feed valve core and abuts against the feed stopper and the valve seat; under the elastic force of the elastic reset member, the feed stopper closes the feed port.

[0011] Preferably, the discharge valve body is provided with a discharge port, the cavity is connected with a discharge channel, and the discharge valve core is connected with the discharge port and the discharge channel; a ring-shaped discharge blocking portion is provided on the discharge valve core, and the cross-sectional area of ​​the discharge blocking portion is larger than the cross-sectional area of ​​the discharge channel; the elastic reset member is sleeved on the discharge valve core and abuts against the discharge blocking portion and the discharge valve body; under the elastic force of the elastic reset member, the discharge blocking portion closes the discharge channel.

[0012] Preferably, a sealing ring is provided on one side of the feed stopper close to the feed port; and a sealing ring is provided on one side of the discharge stopper close to the discharge channel.

[0013] Preferably, a supporting portion is provided below the feed blocking portion, a receiving groove is formed between the feed blocking portion and the supporting portion, and the sealing ring is sleeved on the receiving groove.

[0014] Compared with the prior art, the beneficial effects of the liquid intelligent metering pump described in the utility model are mainly reflected in: a detachable feed valve body and a discharge valve body are provided to facilitate the disassembly and assembly of the valve core; at the same time, a notch is provided in the feed valve core, and the notch is provided along the length direction of the valve core body, so that the flow space between the feed valve core and the feed valve body is large, thereby improving the flow efficiency of the fluid.

[0015] By setting a floating joint, the linear moving mechanism and the metering piston head are movably matched, thereby eliminating the misalignment problem that occurs when the linear moving mechanism and the metering piston head are connected; when the coaxiality of the linear moving mechanism and the metering piston head is inconsistent, the thrust applied by the linear moving mechanism to the metering piston head will not be reduced, thereby ensuring the normal movement of the metering piston head in the metering piston cylinder; thereby, it will not affect the output of the liquid in the metering pump.

[0016] By setting the main seat, the overall strength of the metering pump is improved. A sealing ring is provided between the connecting piece and the main seat, which improves the sealing effect between the main seat and the connecting piece and improves the reliability. At the same time, by setting the sleeve body, an observation window is provided on the sleeve body, which is convenient for observing the activities of the connecting piece in the cavity.

[0017] The feed valve body and the discharge valve body are respectively connected to the valve seat, and sealing structures are provided at the input end and the output end of the valve seat, so that when the fluid is input into the valve seat, the feed valve body opens and the discharge valve body closes; when the fluid is output from the valve seat, the feed valve body closes and the discharge valve body opens; this ensures that when the valve seat outputs the fluid, external fluid cannot enter the valve seat, thereby avoiding the mixing of external fluid and fluid in the valve seat to cause metering errors.

[0018] When the metering piston head moves away from the cavity, the pressure in the cavity decreases, the pressure outside the valve seat is greater than the pressure inside the valve seat, the external fluid pushes the feed valve core to move, the feed stop is separated from the feed valve body, the feed port is connected with the cavity, and the fluid flows into the cavity from the feed port; at the same time, under the action of pressure, the external fluid presses the discharge valve core against the valve body, the discharge valve core closes the discharge channel, and the discharge port is disconnected from the cavity, preventing the fluid in the metering pump from flowing out when the fluid is input.

[0019] When the metering piston head moves toward the cavity, the pressure in the cavity increases, the pressure outside the valve seat is lower than the pressure inside the valve body, the fluid inside the valve seat pushes the discharge valve core to move, the discharge resistance part is separated from the discharge channel, the discharge port is connected with the cavity, and the fluid in the cavity flows out through the discharge port; at the same time, under the action of pressure, the fluid inside the valve seat pushes the feed valve core to move, the feed resistance part contacts the feed valve body and is pressed against the feed valve body, the feed port is disconnected from the cavity, to prevent fluid from flowing into the metering pump when the fluid is discharged.

[0020] By setting the sealing ring, the sealing effect between the feed resisting part and the feed port is further improved, and the sealing effect between the discharge resisting part and the discharge channel is further improved; the reliability is good. At the same time, the sealing ring is set on the accommodating groove, and the sealing ring is limited by the feed resisting part and the supporting force, which improves the stability of the sealing ring set on the feed valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0022] Figure 1 It is a schematic diagram of the utility model.

[0023] Figure 2 It is a cross-sectional view of the utility model.

[0024] Figure 3 for Figure 2 Schematic diagram of the feed valve body, discharge valve body and valve seat after separation.

[0025] Figure 4 It is a three-dimensional schematic diagram of the feed valve core in the utility model.

[0026] Description of the drawings: valve mechanism 1, metering piston cylinder 2, linear moving mechanism 3, main seat 4, sleeve 5, floating joint 6, valve seat 11, feed valve body 12, discharge valve body 13, metering piston head 21, motor seat 30, motor 31, coupling 32, bearing seat 33, ball screw 34, lock nut 35, connecting piece 36, accommodating chamber 110, feed channel 111, discharge channel 112, feed port 121, feed valve core 122, elastic reset member 123, sealing ring 124, discharge port 131, discharge valve core 132, feed stop portion 1221, supporting portion 1222, accommodating groove 1223, valve core body 1224, 1225, notch 1226, discharge stop portion 1321. DETAILED DESCRIPTION

[0027] The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model. In the present embodiments, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model, 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 of the utility model.

[0028] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this utility model are for illustrative purposes only.

[0029] A liquid intelligent metering pump, such as Figures 1 to 4 As shown, it comprises a valve mechanism 1, a metering piston cylinder 2 and a linear moving mechanism 3 connected in sequence, wherein the valve mechanism 1 comprises a valve seat 11, wherein a cavity 110 is provided in the valve seat 11, and the cavity 110 is communicated with the metering piston cylinder 2. A detachable inlet valve body 12 and a detachable outlet valve body 13 are provided on the valve seat 11; the inlet valve body 12 is threadedly connected to the input end of the valve seat 11, and is used to control the on-off of the fluid input in the valve seat 11; the outlet valve body 13 is threadedly connected to the output end of the valve seat 11, and is used to control the on-off of the fluid output in the valve seat 11.

[0030] It should be noted that the valve mechanism 1 may be a one-way valve or a three-way valve. In this embodiment, the valve mechanism 1 is a one-way valve.

[0031] A main seat 4 is provided between the metering piston cylinder 2 and the linear motion mechanism 3. By providing the main seat 4, the overall strength of the metering pump is improved; a sleeve 5 is provided at one end of the main seat away from the linear motion mechanism 3, the sleeve 5 is sleeved on the outside of the metering piston cylinder 2 and connected to the main seat 4, a cavity is formed between the metering piston cylinder 2, the main seat 4 and the sleeve 5, and an observation window 51 corresponding to the position of the cavity is provided on the sleeve 5.

[0032] The linear motion mechanism 3 includes a motor 31, a coupling 32, a bearing seat 33, a ball screw 34, a lock nut 35 and a connecting piece 36; the motor 31 is fixed on the motor seat 30, the motor seat 30 is connected to the bearing seat 33, the bearing seat 33 is fixed to one end of the main seat 4, and a bearing is provided in the bearing seat 33 (not shown in the figure).

[0033] The ball screw 34 is inserted into the main seat 4 and the bearing, one end of the ball screw 34 is connected to the motor 31 through the coupling 32, and the other end of the ball screw 34 is connected to the lock nut 35. The lock nut 35 is connected to a connecting piece 36. The connecting piece 36 extends into the metering piston cylinder 2 and is connected to the metering piston head 21 in the metering piston cylinder 2 through the floating joint 6.

[0034] By setting the floating joint 6, the linear moving mechanism 3 and the metering piston head 21 are movably matched, thereby eliminating the misalignment problem that occurs when the linear moving mechanism 3 and the metering piston head 21 are connected; when the coaxiality of the linear moving mechanism 3 and the metering piston head 2 is inconsistent, the thrust applied by the linear moving mechanism 3 to the metering piston head 21 will not be reduced, thereby ensuring the normal movement of the metering piston head 21 in the metering piston cylinder 2; thereby, it will not affect the output of the liquid in the metering pump.

[0035] In this embodiment, a sealing ring is provided between the connecting member 36 and the main seat 4, which improves the sealing effect between the main seat 4 and the connecting member 36 and has good reliability; at the same time, by setting the sleeve 5, an observation window 51 is provided on the sleeve 5, which facilitates the observation of the movement of the connecting member 36 in the cavity.

[0036] In a preferred embodiment, a shell 7 is provided on the outside of the main seat 4 and the motor seat 30, and the rigidity of the metering pump is further improved by providing the shell 7.

[0037] The feed valve body 12 is provided with a feed port 121, the cavity 110 is connected with a feed channel 111, and the feed valve core 122 connects the feed port 121 and the feed channel 111; an annular feed stopper 1221 is provided on the feed valve core 122, and the cross-sectional area of ​​the stopper is larger than the cross-sectional area of ​​the feed port 121; the elastic return member 123 is sleeved on the feed valve core 122 and abuts against the feed stopper 1221 and the valve seat 11; under the elastic force of the elastic return member 123, the feed stopper 1221 presses the feed valve body 12, and the feed stopper 1221 closes the feed port 121.

[0038] The discharge valve body 13 is provided with a discharge port 131, the cavity 110 is connected with a discharge channel 112, and the discharge valve core 132 connects the discharge port 131 and the discharge channel 112; an annularly arranged discharge blocking portion 1321 is provided on the discharge valve core 132, and the cross-sectional area of ​​the discharge blocking portion 1321 is larger than the cross-sectional area of ​​the discharge channel 112; the elastic reset member 123 is sleeved on the discharge valve core 132 and abuts against the discharge blocking portion 1321 and the discharge valve body 13; under the elastic force of the elastic reset member 123, the discharge blocking portion 1321 presses the valve seat 11, and the discharge blocking portion 1321 closes the discharge channel 112. In this embodiment, the elastic reset member 123 is a spring. A sealing ring 124 is provided on the side of the feed blocking portion 1221 close to the feed port 121; a sealing ring 124 is provided on the side of the discharge blocking portion 1321 close to the discharge channel 112. By providing the sealing ring 124, the sealing effect between the feed stopper 1221 and the feed port 121 is further improved, and the sealing effect between the discharge stopper 1321 and the discharge channel 112 is further improved, and the reliability is good.

[0039] In a preferred embodiment, Figure 3 and Figure 4 As shown, a supporting portion 1222 is provided below the feed stopper 1221, and a receiving groove 1223 is formed between the feed stopper 1221 and the supporting portion 1222, and the sealing ring 124 is sleeved on the receiving groove 1223. The sealing ring 124 is sleeved on the receiving groove 1223, and the sealing ring 124 is limited by the feed stopper 1221 and the supporting portion 1222, thereby improving the stability of the sealing ring 124 arranged on the feed valve core 122.

[0040] The feed valve core 122 includes a valve core body 1224 and two or more extensions 1225, the two or more extensions 1225 are arranged around the valve core body 1224, and a gap 1226 is formed between adjacent extensions 1225, and the gap 1226 is arranged along the length direction of the valve core body 1224. In this embodiment, the discharge valve core 132 has the same structure as the feed valve core 122, and will not be described here. The gap 1226 is provided, and the gap 1226 is provided along the length direction of the valve core body 1224, so that the flow space between the feed valve core 122 and the feed valve body 12 is large, thereby improving the flow efficiency of the fluid. In this embodiment, the discharge valve core 132 has the same structure as the feed valve core 122, and will not be described here.

[0041] By providing a detachable feed valve body and a discharge valve body, the disassembly and assembly of the feed valve core and the discharge valve core are facilitated; the feed valve body 12 and the discharge valve body 13 are respectively connected to the valve seat 11, and then a sealing structure is provided at the input end and the output end of the valve seat 11, so that when the fluid is input to the valve seat 11, the feed valve body 12 opens and the discharge valve body 13 closes; when the fluid is output from the valve seat 11, the feed valve body closes and the discharge valve body 13 opens; this ensures that when the valve seat 11 outputs the fluid, the external fluid cannot enter the valve seat 11, thereby avoiding the mixing of the external fluid with the fluid in the valve seat 11 to cause a metering error.

[0042] The working principle of the utility model is as follows: the metering piston head moves away from the cavity 110, the pressure in the cavity 110 decreases, the pressure outside the valve seat 11 is greater than the pressure inside the valve seat 11, the external fluid pushes the feed valve core 122 to move, the feed stop 1221 is separated from the feed valve body 12, the feed port 121 is connected with the cavity 110, and then the fluid flows into the cavity 110 from the feed port 121; at the same time, under the action of pressure, the external fluid presses the discharge valve core 132 against the valve body 11, the discharge valve core 132 closes the discharge channel 112, and the discharge port 131 is disconnected from the cavity 110, so as to prevent the fluid in the metering pump from flowing out when the fluid is input.

[0043] The metering piston head moves toward the cavity 110, the pressure in the cavity 110 increases, the pressure outside the valve seat 11 is lower than the pressure inside the valve body, the fluid inside the valve seat 11 pushes the discharge valve core 132 to move, the discharge resistance portion 1321 is separated from the discharge channel 112, the discharge port 131 is connected with the cavity 110, and the fluid in the cavity 110 flows out through the discharge port 131; at the same time, under the action of pressure, the fluid inside the valve seat 11 pushes the feed valve core 122 to move, the feed resistance portion 1221 contacts and presses on the feed valve body 12, and the feed port 121 is disconnected from the cavity 110, to prevent fluid from flowing into the metering pump when the fluid is discharged.

[0044] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A liquid intelligent metering pump, comprising a valve mechanism, a metering piston cylinder and a linear moving mechanism connected in sequence, wherein the valve mechanism comprises a valve seat, a cavity is provided in the valve seat, the cavity is communicated with the metering piston cylinder, and a metering piston head is provided in the metering piston cylinder, characterized in that: It also includes a floating joint, and the linear moving mechanism is connected to the metering piston head through a floating joint; a detachable feed valve body and a detachable discharge valve body are provided on the valve seat; a feed valve core is provided in the feed valve body, and the feed valve core is used to control the on-off of the fluid input in the valve seat; a discharge valve core is provided in the discharge valve body, and the discharge valve body is used to control the on-off of the fluid output in the valve seat; a feed valve core is provided in the feed valve body, and the feed valve core includes a valve core body and two or more extension parts, the two or more extension parts are arranged around the valve core body, and a gap is formed between adjacent extension parts, and the gap is arranged along the length direction of the valve core body.

2. The liquid intelligent metering pump according to claim 1, characterized in that: The linear motion mechanism includes a motor, a coupling, a bearing seat, a ball screw, a lock nut and a connecting piece; a bearing is provided in the bearing seat, the ball screw is inserted into the bearing, one end of the ball screw is connected to the motor through the coupling, the other end of the ball screw is connected to the lock nut, and the lock nut is connected to the floating joint through the connecting piece.

3. The liquid intelligent metering pump according to claim 2, characterized in that: A main seat is provided between the metering piston cylinder and the linear moving mechanism, the motor is fixedly connected to the main seat, the connecting piece is movably arranged in the main seat, one end of the connecting piece passes through the main seat and is connected to the floating joint, and a sealing ring is provided between the connecting piece and the main seat.

4. The liquid intelligent metering pump according to claim 3, characterized in that: A sleeve is provided at one end of the main seat away from the linear moving mechanism. The sleeve is sleeved outside the metering piston cylinder. A cavity is formed between the metering piston cylinder, the main seat and the sleeve. An observation window corresponding to the position of the cavity is provided on the sleeve.

5. The liquid intelligent metering pump according to claim 1, characterized in that: The feed valve body is provided with a feed port, the cavity is connected with a feed channel, and the feed valve core is connected with the feed port and the feed channel; an annular feed stopper is provided on the feed valve core, and the cross-sectional area of ​​the feed stopper is larger than the cross-sectional area of ​​the feed port; the elastic reset member is sleeved on the feed valve core and abuts against the feed stopper and the valve seat; under the elastic force of the elastic reset member, the feed stopper closes the feed port.

6. The liquid intelligent metering pump according to claim 5, characterized in that: The discharge valve body is provided with a discharge port, the cavity is connected with a discharge channel, and the discharge valve core is connected with the discharge port and the discharge channel; an annularly arranged discharge blocking portion is provided on the discharge valve core, and the cross-sectional area of ​​the discharge blocking portion is larger than the cross-sectional area of ​​the discharge channel; the elastic reset member is sleeved on the discharge valve core and abuts against the discharge blocking portion and the discharge valve body; under the elastic force of the elastic reset member, the discharge blocking portion closes the discharge channel.

7. The liquid intelligent metering pump according to claim 5, characterized in that: A sealing ring is arranged on one side of the feed stopper close to the feed port; and a sealing ring is arranged on one side of the discharge stopper close to the discharge channel.

8. The liquid intelligent metering pump according to claim 7, characterized in that: A supporting part is arranged below the feed blocking part, a receiving groove is formed between the feed blocking part and the supporting part, and the sealing ring is sleeved on the receiving groove.

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