Constant-flow injection pump and reversing valve thereof

Abstract

The utility model discloses a constant-flow injection pump and a reversing valve thereof, and relates to the technical field of injection pumps, and the constant-flow injection pump comprises two injectors and two sets of driving components; the output end of the driving assembly drives the piston rod of the injector to move along the sleeve; and the liquid ports of the two injectors are respectively connected to the head end ports of the two injection channels on the same reversing valve. The reversing valve comprises a valve body and a valve element, and the valve element is installed on the valve body. A channel A and a channel B are formed in the lower surface of the valve element. A channel aa, a channel ab, a channel ba, a channel bb, an injection channel C and an injection channel D are arranged in the valve body; wherein the head end port of the channel aa is a liquid inlet, and the head end port of the channel ba is connected with the tail end port of the channel aa; the head end port of the channel bb is used as a liquid outlet, and the head end port of the channel ab is connected with the tail end port of the channel bb; according to the utility model, the volume can be reduced, the product cost is reduced, and the continuous transmission of liquid is realized through the electronic control execution device.

Description

Technical Field

[0001] This utility model belongs to the field of injection pump technology, specifically relating to a constant flow injection pump and its reversing valve. Background Technology

[0002] A syringe pump is a volumetric pump primarily used for fluid distribution or transport, and is widely used in industries such as food and chemicals. When using a syringe pump to transfer liquids, the syringe performs a reciprocating pumping motion, while a directional valve simultaneously switches directions to coordinate with the syringe and complete the liquid transfer.

[0003] When a syringe pump needs to continuously and uninterruptedly deliver liquid, a single syringe pump cannot meet the requirement. A single syringe pump cannot discharge liquid while drawing it in, resulting in intermittent liquid delivery. Constant flow injection is achieved using two syringe pumps and two reversing valves, but this method is bulky and costly. There is an urgent need for a smaller, lower-cost constant flow syringe pump to fill this gap and be used in industrial production systems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a constant flow syringe pump and its reversing valve. This pump can replace the function of two reversing valves working together, can accommodate two syringes, is driven by a single motor, reduces size and product cost, and achieves continuous liquid transfer through an electronically controlled actuator.

[0005] This utility model is achieved through the following technical solution:

[0006] A novel reversing valve includes a valve body and a valve core, wherein the valve core is mounted on the valve body; the lower surface of the valve core is provided with channels A and B; the valve body is provided with channels aa, ab, ba, bb and injection channels C and D.

[0007] Among them, the first port of channel aa is the liquid inlet, and the first port of channel ba is connected to the last port of channel aa; the first port of channel bb is the liquid outlet, and the first port of channel ab is connected to the last port of channel bb.

[0008] The end ports of the six channels aa, ab, ba, bb, injection channel C, and injection channel D are all arc-shaped slots set on the upper surface of the valve body.

[0009] The two ends of channel A and channel B are respectively connected to the corresponding arc-shaped slots.

[0010] Furthermore, it includes a valve body and a valve core, wherein the valve core is installed in the valve body; characterized in that the end ports of the four channels aa, ab, ba, and bb are all located in the peripheral area of ​​the upper surface of the valve body, and the end ports of the injection channels C and D are located in the central area of ​​the upper surface of the valve body.

[0011] Furthermore, channel A corresponds to channel aa and channel bb, and channel B corresponds to channel ba and bb; as the relative rotation angle between the valve core and the valve body increases, the following four states exist:

[0012] In the first-level state, injection channels C and D are extracted simultaneously, and injection channels C, A, and aa are connected sequentially, as are injection channels D, B, ba, and aa.

[0013] Secondary state: Injection channel C is drawn out and injection channel D is discharged; injection channels C, A and aa are connected in sequence; injection channels D, B and bb are connected in sequence.

[0014] Level 3 state: Injection channels C and D are discharged simultaneously, and injection channels C, A, ab, and bb are connected in sequence, as are injection channels D, B, and bb.

[0015] Level 4 state: Injection channel C discharges and injection channel D extracts; injection channels C, A, ab, and bb are connected in sequence; injection channels D, B, ba, and aa are connected in sequence.

[0016] Furthermore, both channels A and B are slots on the lower surface of the valve core; channel A is a straight slot extending outward from the center of the valve core; channel B is a three-pronged slot, wherein the two prongs of the three-pronged slot face outward from the valve core.

[0017] Furthermore, an annular positioning groove is provided on the upper surface of the valve body, and the valve core is installed in the annular positioning groove; the end ports of channels aa, ab, ba, bb, injection channel C and injection channel D are all located within the area enclosed by the annular positioning groove.

[0018] Furthermore, the three-branched slots of the channel B are branch m, branch l and branch n, wherein the end of branch n is connected to the end port of the injection channel D, the end of branch l is normally closed in the first-level, second-level and third-level states, and is connected to the end port of channel ba in the fourth-level state; the end of branch m is connected to the end port of channel ba and the end port of channel bb respectively at different rotation angles of the valve core and the valve body.

[0019] A novel constant flow injection pump includes two syringes and two sets of drive assemblies; the syringes and drive assemblies correspond one-to-one; the output end of the drive assembly drives the piston rod of the syringe to move along its sleeve; it also includes a reversing valve as described above, wherein the liquid ports of the two syringes are respectively connected to the first end ports of two injection channels on the same reversing valve.

[0020] Furthermore, it also includes a drive front housing; two parallel support plates are provided at the rear of the drive front housing, and the support plates are perpendicular to the drive front housing; two sets of drive components are respectively mounted on the corresponding support plates, and the two syringes and the reversing valve are both mounted in front of the drive front housing.

[0021] Furthermore, the drive assembly includes a drive motor and a lead screw pair. The drive motor is mounted on the corresponding support plate. The two ends of the lead screw of the lead screw pair are connected to the bearings of the support plate. The drive motor drives the lead screw of the lead screw pair to rotate. The lead screw nut of the lead screw pair passes through the drive front housing and is connected to the piston rod of the syringe. The lead screw nut drives the piston rod to move linearly inside the syringe sleeve. After the working state is stable, the sum of the output flow rates of the two syringes remains constant.

[0022] Furthermore, the drive assembly also includes a synchronous pulley set; the drive motor drives the lead screw nut of the lead screw pair to rotate through the synchronous pulley set; the reversing motor of the reversing valve is installed on the back of the drive front housing, and its output end passes through the drive front housing and is connected to the valve body of the reversing valve.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] Compared to existing technologies where a single motor can only drive one directional control valve, and the directional control valve can only accommodate one syringe, this directional control valve can accommodate two syringes simultaneously and be driven by a single directional control motor. This not only reduces the size of the valve but also lowers the product cost. Attached Figure Description

[0025] Figure 1 This is an exploded view of the overall structure of the reversing valve of this utility model;

[0026] Figure 2 This is a schematic diagram of the lower surface of the valve core of the reversing valve of this utility model;

[0027] Figure 3 This is a schematic diagram of the lower surface of the valve body of the reversing valve of this utility model;

[0028] Figure 4 This is a schematic diagram of the internal passage of the reversing valve body of this utility model;

[0029] Figure 5 This is a schematic diagram showing the position of the end port of the directional valve body of this utility model;

[0030] Figure 6 This is a schematic diagram of the channel connection in the first stage state of the reversing valve of this utility model;

[0031] Figure 7 This is a schematic diagram of the channel connection in the secondary state of the reversing valve of this utility model;

[0032] Figure 8This is a schematic diagram of the channel connection of the reversing valve in the three-stage state of this utility model;

[0033] Figure 9 This is a schematic diagram of the channel connection of the reversing valve in the fourth stage state of this utility model;

[0034] Figure 10 This is a schematic diagram illustrating the application principle of the reversing valve of this utility model.

[0035] Figure 11 This is a three-dimensional structural diagram of the constant flow injection pump of this utility model;

[0036] Figure 12 This is a schematic diagram of the internal structure of the constant flow injection pump of this utility model;

[0037] Figure 13 This is a schematic diagram of the rear structure of the drive housing of this utility model.

[0038] In the diagram: 1. Wave spring, 2. Planar thrust bearing, 3. Valve core positioning block, 4. Valve core, 5. O-ring, 6. Valve body, 7. PTFE ball, 8. Valve core mounting block, 4-1. Channel A, 4-2. Channel B, 6-1. Channel aa, 6-2. Channel ab, 6-3. Channel ba, 6-4. Channel bb, 6-5. Annular positioning groove, 6-6. Injection channel D, 6-7. Injection channel C, 6-1-1. End port of channel aa, 6-2-2. End port of channel ab. 6-3-3, End port of channel ba, 6-4-4, End port of channel bb, 6-5-5, Annular positioning groove, 6-6-6, End port of injection channel D, 6-7-7, End port of injection channel C, 10, Reversing valve, 20, Drive front housing, 30, Syringe C, 40, Syringe D, 50, Reversing motor, 60, Actuator C, 70, Actuator D, 80, Lead screw, 90, Nut, 100, Drive motor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0040] Reference Figures 11 to 13 This embodiment provides a constant flow syringe pump, which includes an actuator C, an actuator D, a syringe C, a syringe D, and a reversing valve; the continuous transfer of liquid is achieved by electronically controlling the actuators. Since the syringes are detachable, syringes of different specifications can be replaced to achieve precise liquid transfer within different ranges.

[0041] In this embodiment, the execution device includes a drive motor and a lead screw pair: the drive motor drives the ball screw of the lead screw pair to rotate, and the ball screw drives the piston rod of the syringe to move up and down reciprocally through the nut connected to the thread.

[0042] The main support structure of this constant flow injection pump consists of a drive front housing and two parallel support plates installed behind the drive front housing; both support plates are perpendicular to the drive front housing.

[0043] Both syringes and the reversing valve are mounted at the front of the drive front housing, with the valve body of the reversing valve and the sleeve of the syringe both fixedly connected to the drive front housing. The drive motor in the actuation assembly is located between two support plates and is mounted on the corresponding support plates.

[0044] Both ends of the ball screw are connected to the support plate via bearings. One motor drives one ball screw to rotate. The nut is threadedly connected to the corresponding ball screw and constrained in the elongated hole of the drive front housing. The piston rod end of the syringe is connected to the nut. The ball screw is driven to rotate via a belt.

[0045] A reversing motor is also installed at the rear of the drive front housing. The drive end of the reversing motor passes through the drive front housing and is connected to the valve core of the reversing valve, driving the valve core to rotate around its own central axis. The liquid ports of the two syringes are respectively connected to the interface of injection channel C and injection channel D of the reversing valve.

[0046] The constant current operation process in this embodiment is as follows:

[0047] A. After startup, the valve core of the reversing valve rotates, putting syringes C and D in the extraction state. Actuator C drives syringe C and actuator D drives syringe D to start extracting liquid simultaneously. After extraction is completed, the reversing valve switches, putting syringes C and D in the output state.

[0048] B. The actuator C drives the syringe C, and the syringe C reaches the set speed with a large acceleration.

[0049] C. After running at a constant speed for a period of time, syringe C begins to decelerate, and at the same time, syringe D begins to accelerate with the same acceleration; after syringe C finishes decelerating, syringe D finishes accelerating and begins to run at a constant speed.

[0050] D. After syringe C decelerates, the reversing valve rotates, putting syringe C in the extraction state. Then, syringe C extracts liquid. After extraction is complete, the reversing valve rotates, switching syringe C to the output state and waiting. During this process, syringe D remains in the output state.

[0051] E. After syringe D completes its constant-speed operation, it begins to decelerate, while simultaneously, syringe C begins to accelerate at the same rate.

[0052] This cycle repeats continuously, with the reversing valve switching and the two syringes working together to achieve constant flow transmission.

[0053] Reference Figure 1 This is the directional valve used in this embodiment, which includes a valve body 6, a valve core 4, a valve core positioning block 3, a valve core mounting block 8, a planar thrust bearing 2, a wave spring 1, an O-ring 5, and a polytetrafluoroethylene ball (PTFE ball) 7.

[0054] The valve body and valve core are mounted together, each with relative rotational freedom; a PTFE ball is mounted on the valve body. A valve core locating block is installed within the valve core mounting hole, and a planar thrust ball bearing and a wave spring are sequentially mounted on the valve core. The valve core mounting block compresses the wave spring, causing the planar thrust bearing to press the valve core tightly against the valve body. The valve core mounting block is then secured to the valve body with an internal hexagon head screw. An O-ring is fitted on the valve core to ensure a seal between the valve core and the valve body.

[0055] Specific reference Figure 2 The valve core has channels A and B on its upper and lower surfaces. Channel A is a straight line, specifically a slot that spans the outer and central areas of the valve body. Channel B is a three-pronged slot, consisting of branch m, branch l, and branch n. The end of branch n is located above the central area of ​​the valve body; the ends of branch l and branch m are both located above the outer area of ​​the valve body.

[0056] Specific reference Figure 4 The valve body has four ports, two of which are externally connected for liquid dispensing or inlet, and the other two are for connecting syringes. The dispensing port is the first port of channel bb, and the first port of channel ab is connected to the last port of channel bb. The inlet port is the first port of channel aa, and channel ba is connected to the last port of channel aa. In this embodiment, the last ports of channels aa, ab, ba, bb, and injection channels C and D are all arc-shaped slots on the upper surface of the valve body. Syringe channels C and D can both achieve both inlet and outlet liquid flow.

[0057] Reference Figure 3 and reference Figure 5 On the upper surface of the valve body, within the area enclosed by the annular positioning groove, there are multiple arc-shaped slots; among them, the two arc-shaped slots located in the central area are the inner inlet of injection channel C and the end port of injection channel D, respectively, and the four arc-shaped slots located in the outer area are the end ports of channel aa, channel ab, channel ba, and channel bb, respectively, which are adjacent in sequence.

[0058] In this embodiment, the end ports of injection channel C and injection channel D are located on the first circumference, and the end ports of channel aa, channel ab, channel ba, and channel bb are located on the second circumference, and the diameter of the second circumference is greater than the diameter of the first circumference.

[0059] The connection of different channels is achieved by the relative rotation of the valve body and the valve core. As the relative rotation angle between the valve core and the valve body increases, the following four states exist:

[0060] Reference Figure 6 In the first-level state, injection channels C and D simultaneously draw liquid: injection channels C, A, and aa are connected in sequence, and injection channels D, B, ba, and aa are connected in sequence; liquid can enter from the first port of channel aa and branch out at the end port of channel aa before reaching the two syringes.

[0061] Reference Figure 7 Secondary state: Liquid is drawn from injection channel C and discharged from injection channel D. Injection channels C, A, and aa are connected in sequence, and injection channels D, B, and bb are connected in sequence. Liquid can enter syringe C through channel aa, and liquid in syringe D can be discharged through channel bb.

[0062] Reference Figure 8 Level 3: Injection channels C and D discharge simultaneously; injection channels C, A, ab, and bb are sequentially connected; injection channels D, B, and bb are sequentially connected; liquid from both syringes is discharged through the first port of channel bb.

[0063] Reference Figure 9 Level 4 state: Injection channel C discharges and injection channel D draws in. Injection channels C, A, ab, and bb are sequentially connected. Injection channels D, B, ba, and aa are sequentially connected. Liquid can enter syringe D through channel aa, and liquid in syringe C can be discharged through channel bb.

[0064] In the above state, the end of the branch n of channel B is connected to the end port of injection channel D. The end of the branch l is normally closed in the first, second and third states, and connected to the end port of channel ba in the fourth state. The end of the branch m is connected to the end port of channel ba in the first state, and connected to the end port of channel bb in the second and third states.

[0065] In this embodiment, the branch l of channel B has an arc-shaped segment, and the length of the arc-shaped slot of channel ba is less than the length of the other three channels on the same circumference.

[0066] By setting the rotation angle and rotation timing for the four states described above, continuous injection can be achieved using two syringes and one reversing valve. (Refer to...) Figure 10 By adjusting the motor to control the reversing valve and the syringe speed of the syringe, continuous and stable liquid output can be achieved.

[0067] It should be noted that the above description is merely a preferred application example of this utility model and is not intended to limit the scope of protection of this utility model. All technical solutions employing equivalent substitutions or equivalent transformations are within the scope of protection of this utility model.

Claims

1. A reversing valve, comprising a valve body and a valve core, wherein the valve core is mounted on the valve body; characterized in that, The lower surface of the valve core is provided with channels A and B; the inside of the valve body is provided with channels aa, ab, ba, bb, injection channel C, and injection channel D; Among them, the first port of channel aa is the liquid inlet, and the first port of channel ba is connected to the last port of channel aa; the first port of channel bb is the liquid outlet, and the first port of channel ab is connected to the last port of channel bb. The end ports of the six channels aa, ab, ba, bb, injection channel C, and injection channel D are all arc-shaped slots set on the upper surface of the valve body. The two ends of channel A and channel B are respectively connected to the corresponding arc-shaped slots.

2. A reversing valve according to claim 1, characterized in that, The device includes a valve body and a valve core, wherein the valve core is installed in the valve body; characterized in that the end ports of the four channels aa, ab, ba, and bb are all located in the peripheral area of ​​the upper surface of the valve body, and the end ports of the injection channels C and D are located in the central area of ​​the upper surface of the valve body.

3. A reversing valve according to claim 1, characterized in that, Channel A corresponds to channels aa and ab, and channel B corresponds to channels ba and bb; as the relative rotation angle between the valve core and the valve body increases, the following four states exist: In the first-level state, injection channels C and D are extracted simultaneously, and injection channels C, A, and aa are connected sequentially, as are injection channels D, B, ba, and aa. Secondary state: Injection channel C is drawn out and injection channel D is discharged; injection channels C, A and aa are connected in sequence; injection channels D, B and bb are connected in sequence. Level 3 state: Injection channels C and D are discharged simultaneously, and injection channels C, A, ab, and bb are connected in sequence, as are injection channels D, B, and bb. Level 4 state: Injection channel C discharges and injection channel D extracts; injection channels C, A, ab, and bb are connected in sequence; injection channels D, B, ba, and aa are connected in sequence.

4. A reversing valve according to claim 1, characterized in that, Channel A and channel B are slots on the lower surface of the valve core; channel A is a straight slot that extends outward from the center of the valve core; channel B is a three-pronged slot, wherein the two prongs of the three-pronged slot face outward from the valve core.

5. A reversing valve according to claim 1, characterized in that, The upper surface of the valve body is provided with an annular positioning groove, and the valve core is installed in the annular positioning groove; the end ports of channels aa, ab, ba, bb, injection channel C and injection channel D are all located within the area enclosed by the annular positioning groove.

6. A reversing valve according to claim 4, characterized in that, The three-branched slots of the channel B are branch m, branch l and branch n. The end of branch n is connected to the end port of the injection channel D. The end of branch l is normally closed in the first, second and third states, and connected to the end port of channel ba in the fourth state. The end of branch m is connected to the end port of channel ba and the end port of channel bb at different rotation angles of the valve core and valve body, respectively.

7. A constant flow syringe pump, comprising two syringes and two drive assemblies; the syringes and drive assemblies correspond one-to-one; the output end of the drive assembly drives the piston rod of the syringe to move along its sleeve; characterized in that, It also includes a reversing valve as described in any one of claims 1 to 6, wherein the liquid ports of the two syringes are respectively connected to the first end ports of the two injection channels on the same reversing valve.

8. A constant flow injection pump according to claim 7, characterized in that, It also includes a drive front housing; two parallel support plates are provided at the rear of the drive front housing, and the support plates are perpendicular to the drive front housing; two sets of drive components are respectively installed on the corresponding support plates, and two syringes and a reversing valve are installed in front of the drive front housing.

9. A constant flow injection pump according to claim 8, characterized in that, The drive assembly includes a drive motor and a lead screw pair, with the drive motor mounted on a corresponding support plate; The two ends of the lead screw of the lead screw pair are connected to the bearings of the support plate, and the drive motor drives the lead screw of the lead screw pair to rotate; the lead screw nut of the lead screw pair passes through the front housing of the drive and is connected to the piston rod of the syringe, and the lead screw nut drives the piston rod to make linear motion in the sleeve of the syringe; after the working state is stable, the sum of the output flow of the two syringes remains constant.

10. A constant flow injection pump according to claim 9, characterized in that, The drive assembly also includes a synchronous pulley set; the drive motor drives the lead screw nut of the lead screw pair to rotate through the synchronous pulley set; the reversing motor of the reversing valve is installed on the back of the drive front housing, and its output end passes through the drive front housing and is connected to the valve body of the reversing valve.

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