Circulating pump for vacuum pipeline

Abstract

The utility model relates to a circulating pump for a vacuum pipeline, and belongs to the technical field of hypervaporization / boiling heat exchange. The circulating pump comprises a first piston pump set which comprises a first piston pump, a first pipeline and a second pipeline; the first piston pump comprises a first suction inlet and a first discharge port which are respectively connected with the first pipeline and the second pipeline; the first pipeline and the second pipeline are respectively provided with a first valve and a second valve; the second piston pump set comprises a second piston pump, a third pipeline and a fourth pipeline; the second piston pump comprises a second suction inlet and a second discharge port which are respectively connected with a third pipeline and a fourth pipeline; the third pipeline and the fourth pipeline are respectively provided with a third valve and a fourth valve; the second pipeline and the fourth pipeline are communicated with a main discharge pipe of the circulating pump; and the control component is configured to control the working processes of the first piston pump set and the second piston pump set to be mutually staggered in the working process. According to the technical scheme, the problem that the flow of the circulating pump is unstable can be solved.

Description

Technical Field

[0001] This application relates to the field of supervaporization / boiling heat exchange technology, and in particular to a circulating pump for vacuum pipelines. Background Technology

[0002] In existing supervaporization / boiling heat exchange technologies, the working fluid, such as water, typically flows in a low-vacuum pipe.

[0003] Under low vacuum conditions, most circulating water pumps suffer from unstable or fluctuating flow rates. Utility Model Content

[0004] In view of this, this application provides a circulating pump for vacuum pipelines to solve at least one problem existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a circulating pump for a vacuum pipeline, comprising:

[0007] The first piston pump assembly includes a first piston pump, a first pipe, and a second pipe; the first piston pump includes a first suction port and a first discharge port respectively connected to the first pipe and the second pipe; the first pipe and the second pipe are respectively provided with a first valve and a second valve;

[0008] The second piston pump assembly includes a second piston pump, a third pipe, and a fourth pipe; the second piston pump includes a second suction port and a second discharge port respectively connected to the third pipe and the fourth pipe; the third pipe and the fourth pipe are respectively provided with a third valve and a fourth valve;

[0009] Both the second pipe and the fourth pipe are connected to the main discharge pipe of the circulating pump;

[0010] The control unit is configured to control the working processes of the first piston pump assembly and the second piston pump assembly to be staggered during operation, so that the main discharge pipe can continuously discharge fluid.

[0011] Optionally, the piston pump includes:

[0012] Pump cylinder;

[0013] The piston rod has a piston at one end and extends out of the pump cylinder at the other end;

[0014] A telescopic tube is sleeved on the portion of the piston rod located outside the pump cylinder and can extend and retract as the piston rod moves; one end of the telescopic tube is sealed to the pump cylinder, and the other end is sealed to the outward end face of the piston rod; the piston pump includes a first piston pump and a second piston pump.

[0015] Optionally, the piston pump assembly further includes:

[0016] The pump cylinder is located at one end of the base;

[0017] The lead screw is parallel to the piston rod and can rotate along its own axis;

[0018] The pusher is provided with a nut that mates with the lead screw; the pusher and the piston rod are linked axially with the lead screw;

[0019] A driving component is provided to drive the lead screw to rotate, and the driving component is located at the other end of the base; the piston pump assembly includes a first piston pump assembly and a second piston pump assembly.

[0020] Optionally, the piston pump assembly further includes:

[0021] The first flange is connected to the piston rod and the outward-facing end face of the telescopic tube, respectively, so that the other end of the telescopic tube is sealed to the outward-facing end face of the piston rod;

[0022] The first flange is also connected to the pusher so that the pusher and the piston rod are axially linked in the lead screw.

[0023] Optionally, the pusher includes a push plate located between the first flange and the pump cylinder; the telescopic tube and the piston rod both pass through the push plate and are connected to the first flange.

[0024] Optionally, the base includes:

[0025] Base plate;

[0026] The first vertical plate is disposed at one end of the base plate near the pump cylinder and is used to fix the pump cylinder.

[0027] The second vertical plate is located at the other end of the base plate away from the pump cylinder and is used to fix the drive component; the two ends of the lead screw are respectively rotatably mounted on the first vertical plate and the second vertical plate.

[0028] Optionally, the piston pump assembly further includes:

[0029] The guide rod is fixed at both ends to the first vertical plate and the second vertical plate respectively, and passes through the push plate. The push plate has a guide hole that cooperates with the guide rod.

[0030] Optionally, the piston pump assembly may further include:

[0031] The second flange has the telescopic pipe and the pump cylinder connected to its two ends respectively, so that the telescopic pipe and the pump cylinder are sealed together.

[0032] Optionally, the telescopic tube is a metal corrugated pipe.

[0033] Optionally, the drive components are arranged on the side away from the pump cylinder or on the same side of the pump cylinder.

[0034] The circulating pump for vacuum pipelines provided in this application embodiment includes: a first piston pump assembly, comprising a first piston pump, a first pipeline, and a second pipeline; the first piston pump includes a first suction port and a first discharge port respectively connected to the first pipeline and the second pipeline; the first pipeline and the second pipeline are respectively provided with a first valve and a second valve; a second piston pump assembly, comprising a second piston pump, a third pipeline, and a fourth pipeline; the second piston pump includes a second suction port and a second discharge port respectively connected to the third pipeline and the fourth pipeline; the third pipeline and the fourth pipeline are respectively provided with a third valve and a fourth valve; the second pipeline and the fourth pipeline are both connected to the main discharge pipe of the circulating pump; and a control component configured to control the working processes of the first piston pump assembly and the second piston pump assembly to be staggered during operation, so that the main discharge pipe can continuously discharge fluid. It can be seen that the circulating pump for vacuum pipelines in this application embodiment, by setting two piston pump assemblies, on the one hand, has better sealing performance, which is beneficial to flow stability; on the other hand, through the alternating discharge of the two piston pumps, fluid can be continuously discharged. Therefore, the circulating pump for vacuum pipelines in this application embodiment can improve the problem of unstable flow rate of circulating pumps in vacuum pipelines.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0037] Figure 1 A schematic diagram illustrating the structural principle of a circulating pump for a vacuum pipeline provided in an embodiment of this application;

[0038] Figure 2 A perspective view of a circulation pump for a vacuum pipeline provided in an embodiment of this application;

[0039] Figure 3A cross-sectional schematic diagram of a circulating pump for a vacuum pipeline provided in an embodiment of this application;

[0040] Figure 4 A schematic diagram of the connection pipes for a circulation pump in a vacuum pipeline provided in this application embodiment. Figure 1 ;

[0041] Figure 5 A schematic diagram of the connection pipes for a circulation pump in a vacuum pipeline provided in this application embodiment. Figure 2 ;

[0042] Figure 6 A schematic flowchart illustrating the control method for a circulating pump provided in an embodiment of this application;

[0043] Figure 7 A detailed flowchart illustrating the control method for a circulating pump provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 11. First piston pump; 111. Pump cylinder; 112. Piston rod; 113. Telescopic pipe; 114. First suction port; 115. First discharge port; 12. First pipeline; 13. Second pipeline; 14. First valve; 15. Second valve; 16. Main discharge pipe; 21. Second piston pump; 214. Second suction port; 215. Second discharge port; 22. Third pipeline; 23. Fourth pipeline; 24. Third valve; 25. Fourth valve; 30. Base; 31. Base plate; 32. First vertical plate; 33. Second vertical plate; 34. Bearing; 35. Guide rod; 41. Lead screw; 42. Pushing component; 421. Nut; 50. Drive component; 61. First flange; 62. Second flange. Detailed Implementation

[0046] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0047] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0048] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0051] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0052] The applicant of this application discovered during the research and development that the reason why circulating water pumps experience unstable or fluctuating flow rates under low vacuum conditions is that most circulating water pumps have poor negative pressure / vacuum sealing performance, making them prone to air leakage, which leads to unstable or fluctuating flow supply. Circulating water pumps with better sealing performance, such as magnetically driven pumps, are prone to cavitation, which also results in unstable flow rates.

[0053] Therefore, based on further research and development by the applicant, the following technical solution was proposed.

[0054] To address the technical problems in related technologies, embodiments of this application provide a circulating pump for vacuum pipelines. (Reference) Figures 1-3 The circulation pump for the vacuum pipeline includes:

[0055] The first piston pump assembly includes a first piston pump 11, a first pipe 12, and a second pipe 13; the first piston pump 11 includes a first suction port 114 and a first discharge port 115 respectively connected to the first pipe 12 and the second pipe 13; the first pipe 12 and the second pipe 13 are respectively provided with a first valve 14 and a second valve 15.

[0056] The second piston pump assembly includes a second piston pump 21, a third pipe 22, and a fourth pipe 23; the second piston pump 21 includes a second suction port 214 and a second discharge port 215 respectively connected to the third pipe 22 and the fourth pipe 23; the third pipe 22 and the fourth pipe 23 are respectively provided with a third valve 24 and a fourth valve 25;

[0057] Both the second pipe 13 and the fourth pipe 23 are connected to the main discharge pipe 16 of the circulating pump;

[0058] The control unit is configured to control the working processes of the first piston pump assembly and the second piston pump assembly to be staggered during operation, so that the main discharge pipe 16 can continuously discharge fluid.

[0059] It should be noted that the first piston pump assembly and the second piston pump assembly have the same structure. Therefore, in order to make the introduction more concise, the first and second will sometimes not be distinguished in the following introduction, but will be referred to collectively. For example, piston pump assembly is used as a collective term for the first piston pump assembly and the second piston pump assembly, and piston pump is used as a collective term for the first piston pump 11 and the second piston pump 21. Other similar cases will be treated in the same way and will not be listed one by one.

[0060] Understandably, a piston pump draws in or discharges fluid by changing the internal volume of the piston through its movement. The piston's movement can be linear.

[0061] Understandably, the suction port and discharge port can be on the same end of the piston pump, with suction and discharge occurring separately.

[0062] Understandably, both the second pipe 13 and the fourth pipe 23 are outlets of the piston pumps. Therefore, both pipes are connected to the main discharge pipe 16, allowing the main discharge pipe 16 to continuously discharge fluid through the alternating discharge of the two piston pumps. Specifically, the main discharge pipe 16 is provided with a main discharge outlet.

[0063] Furthermore, both the first pipe 12 and the third pipe 22 can be connected to the main input pipe for the input fluid, allowing the main input pipe to continuously input fluid. By controlling the first valve 14 and the third valve 24, the fluid can be alternately input into the first pipe 12 and the third pipe 22.

[0064] Understandably, the working processes of the first piston pump group and the second piston pump group are staggered during operation. This can be achieved by staggering the intake and discharge processes of the two piston pump groups. For example, when the first piston pump group is intake, the second piston pump group is discharge, so that the total discharge pipe 16 always has a stable flow rate.

[0065] The circulating pump for vacuum pipelines in this application embodiment has two piston pump sets. On the one hand, the piston pumps have better sealing performance, which is conducive to flow stability; on the other hand, the fluid can be continuously discharged by the alternating discharge of the two piston pumps.

[0066] In other embodiments of this application, the piston pump may include:

[0067] Pump cylinder 111;

[0068] The piston rod 112 has a piston at one end and extends out of the pump cylinder 111 at the other end;

[0069] The telescopic tube 113 is sleeved on the portion of the piston rod 112 located outside the pump cylinder 111, and can extend and retract as the piston rod 112 moves; one end of the telescopic tube 113 is sealed to the pump cylinder 111, and the other end is sealed to the outward end face of the piston rod 112; the piston pump includes the first piston pump 11 and the second piston pump 21.

[0070] Understandably, the telescopic tube 113 in this embodiment distinguishes the piston pump from a typical piston pump. Specifically, the telescopic tube 113 can be a vacuum environment. Since one end of the telescopic tube 113 is sealed to the pump cylinder 111, and the other end is sealed to the outward-facing end face of the piston rod 112, the movement of the piston rod 112 will not change the vacuum environment inside the telescopic tube 113. Understandably, the vacuum environment can be a relative vacuum, and the vacuum level only needs to be maintained at the user's required level. In this embodiment, the vacuum environment inside the telescopic tube 113 can be a low vacuum, also called a rough vacuum. Specifically, the telescopic tube 113 can be a metal bellows. Metal bellows are more durable and have a longer service life.

[0071] Specifically, the bellows have an angle of 45 degrees. A 45-degree angle provides greater deformation capacity (i.e., expansion and contraction capacity) and a longer service life.

[0072] Specifically, the corrugated pipe is made of 316L stainless steel.

[0073] 316L stainless steel has high strength and strong corrosion resistance, especially good corrosion resistance at high temperatures.

[0074] In other embodiments of this application, the piston pump assembly may further include:

[0075] The base 30, and the pump cylinder 111 is located at one end of the base 30;

[0076] The lead screw 41 is parallel to the piston rod 112 and can rotate along its own axis;

[0077] The pusher 42 is provided with a nut 421 that cooperates with the lead screw 41; the pusher 42 and the piston rod 112 are linked axially with the lead screw 41.

[0078] The driving component 50 can drive the lead screw 41 to rotate, and the driving component 50 is located at the other end of the base 30; the piston pump assembly includes a first piston pump assembly and a second piston pump assembly.

[0079] The lead screw 41 and lead nut 421 can convert the rotation of the drive component 50 into linear movement with high accuracy in the movement distance. Therefore, by setting the lead screw 41 and lead nut 421, the amount of fluid pumped out by the piston pump assembly can be better controlled.

[0080] The pusher 42 and piston rod 112 are axially linked in the lead screw 41, meaning that when the pusher 42 moves along the axial direction of the lead screw 41, the piston rod 112 moves accordingly. This linkage can be established by directly fixing them together through interference fit, welding, or other connecting components, such as couplings.

[0081] Specifically, the drive component 50 can be a motor. More specifically, the drive component 50 can be a stepper motor or a servo motor, thus allowing the speed to be adjusted as needed.

[0082] In other embodiments of this application, the piston pump assembly may further include:

[0083] The first flange 61 is connected to the outward end face of the piston rod 112 and the telescopic tube 113 respectively, so that the other end of the telescopic tube 113 is sealed to the outward end face of the piston rod 112;

[0084] The first flange 61 is also connected to the pusher 42 so that the pusher 42 and the piston rod 112 are axially linked in the lead screw 41.

[0085] Understandably, the first flange 61 can be a connecting intermediary, connecting the outward-facing end faces of the piston rod 112 and the telescopic tube 113 respectively, thus enabling the piston rod 112 and the telescopic tube to move in tandem. The telescopic tube 113 is sleeved around the piston rod 112 and seals the piston rod 112 through the first flange 61.

[0086] Specifically, the piston pump assembly may further include:

[0087] The second flange 62 is connected at both ends to the telescopic tube 113 and the pump cylinder 111, respectively, so that the telescopic tube 113 and the pump cylinder 111 are sealed together. This also seals the piston rod 112 inside the telescopic tube 113, making it easier to maintain the vacuum environment of the telescopic tube 113.

[0088] In other embodiments of this application, the pusher 42 includes a push plate located between the first flange 61 and the pump cylinder 111; the telescopic tube 113 and the piston rod 112 both pass through the push plate and are connected to the first flange 61.

[0089] Understandably, the push plate is designed to facilitate the telescopic tube 113 and the piston rod 112 passing through the pusher 42, and the push plate has a small moment of inertia, which reduces the energy required to drive the lead screw 41.

[0090] In other embodiments of this application, the base 30 includes:

[0091] Base plate 31;

[0092] The first vertical plate 32 is disposed at one end of the base plate 31 near the pump cylinder 111 and is used to fix the pump cylinder 111.

[0093] The second vertical plate 33 is disposed at the other end of the base plate 31 away from the pump cylinder 111, and is used to fix the drive component 50; the two ends of the lead screw 41 are respectively rotatably disposed on the first vertical plate 32 and the second vertical plate 33.

[0094] Understandably, the first vertical plate 32 and the second vertical plate 33 respectively support the two ends of the lead screw 41 to ensure its smooth rotation. Specifically, the first vertical plate 32 and the second vertical plate 33 are each provided with a bearing 34 to support the lead screw 41. This reduces the resistance to the rotation of the lead screw 41 and further improves its rotational stability.

[0095] In other embodiments of this application, the piston pump assembly further includes:

[0096] The guide rod 35 is fixed at both ends to the first vertical plate 32 and the second vertical plate 33 respectively, and passes through the push plate. The push plate has a guide hole that cooperates with the guide rod 35.

[0097] The cooperation between the guide rod 35 and the guide hole improves the straightness of the push plate's movement direction, thus making the flow rate discharged by the piston pump assembly more stable. Additionally, the guide rod 35 also supports the push plate, allowing for better cooperation between the nut 421 and the lead screw 41 on the push plate, further enhancing the stability of the push plate's movement.

[0098] Further, refer to Figure 4 and Figure 5 The drive component 50 in the circulating pump used in vacuum pipelines can be arranged in two ways, one of which is as follows: Figure 4 As shown, the drive component 50 is arranged on the side away from the pump cylinder 111, so that there is no mutual interference between the drive component 50 and the pump cylinder 111. Another example is... Figure 5 As shown, the drive components 50 are arranged on the same side of the pump cylinder 111. This makes the circulating pump structure more compact. It is understood that other arrangements are also possible.

[0099] Furthermore, it is understandable that other components can also be arranged in various ways, which will not be detailed here.

[0100] This application also provides a control method for the circulating pump described above, see reference. Figure 6 The method includes:

[0101] Step 801: During operation, the working processes of the first piston pump group and the second piston pump group are staggered to ensure that the main discharge pipe 16 can continuously discharge fluid.

[0102] Understandably, the working processes of the first piston pump group and the second piston pump group are staggered during operation. This can be achieved by staggering the intake and discharge processes of the two piston pump groups. For example, when the first piston pump group is intake, the second piston pump group is discharge, so that the total discharge pipe 16 always has a stable flow rate.

[0103] In other embodiments of this application, reference is made to Figure 7 The step of controlling the working processes of the first piston pump assembly and the second piston pump assembly to be staggered so that the main discharge pipe 16 can continuously discharge fluid includes:

[0104] Step 8011: Open the first valve 14, start the operation of the drive component 50 of the first piston pump group, drive the piston of the first piston pump 11 to move in the first direction, so as to expand the volume of the chamber connected to the pump cylinder 111 and the first pipe 12.

[0105] Understandably, opening the first valve 14 connects the first suction port 114 and the first pipe 12. The piston moves in the first direction, increasing the volume of the chamber connected to the first pipe 12 in the pump cylinder 111, and the fluid in the first pipe 12 is drawn in.

[0106] The first direction is Figure 1 The center direction is to the left. Specifically, this can be achieved by driving the lead screw 41 to rotate forward using a motor.

[0107] Step 8012: Close the first valve 14, open the second valve 15, and drive the piston of the first piston pump 11 to move in a second direction; the second direction is opposite to the first direction.

[0108] The second valve 15 is opened, connecting the second pipe 13 and the first outlet 115. The piston moves in the second direction, reducing the volume of the chamber connected to the first pipe 12 in the pump cylinder 111. Since the first valve 14 is closed, the fluid in the chamber is forced to flow into the second pipe 13 through the first outlet 115.

[0109] The second direction is Figure 2 The direction is to the right. Specifically, this can be achieved by driving the lead screw 41 to reverse direction via a motor. Both forward and reverse rotation can be preset and can be achieved by adjusting the direction of the threads on the lead screw 41 and the nut 421, so that the piston moves to the left when rotating forward and to the right when rotating in reverse.

[0110] Step 8013: While closing the first valve 14, open the third valve 24 to start the operation of the drive component 50 of the second piston pump group, drive the piston of the second piston pump 21 to move in the first direction, so as to expand the volume of the chamber connected to the pump cylinder 111 and the third pipe 22.

[0111] The third valve 24 is opened, connecting the second suction port 214 and the third pipe 22. The piston moves in the first direction, increasing the volume of the chamber connected to the pump cylinder 111 and the third pipe 22, and the fluid in the third pipe 22 is drawn in.

[0112] That is, when the first piston pump assembly discharges fluid through the second pipe 13, the second piston pump assembly draws in fluid through the third pipe 22. This is what was mentioned earlier, where the working processes are staggered.

[0113] Step 8014: Close the third valve 24, open the fourth valve 25, and drive the piston of the second piston pump 21 to move in the second direction.

[0114] The fourth valve 25 is opened, connecting the fourth pipe 23 and the second outlet 215. The piston moves in the second direction, reducing the volume of the chamber connected to the fourth pipe 23 in the pump cylinder 111. Because the third valve 24 is closed, the fluid in the chamber is forced to flow into the fourth pipe 23 through the second outlet 215.

[0115] While closing the third valve 24, return to step 8011 above and execute it again, repeating this process in a cyclical manner.

[0116] That is, when the second piston pump assembly discharges fluid through the fourth pipe 23, the first piston pump assembly draws in fluid through the first pipe 12, and their working processes are staggered.

[0117] The above steps are repeated so that the main discharge pipe 16 can continuously discharge fluid.

[0118] In other embodiments of this application, the method further includes:

[0119] During operation, the volume change rate of the first piston pump group and the second piston pump group is controlled so that the difference in flow rate of the total discharge pipe 16 of the circulating pump at different times is less than a preset value.

[0120] The first and second piston pump groups achieve continuous fluid discharge through alternating fluid discharge. However, a brief instability in flow rate may occur at the moment of switching between the first and second piston pump groups. Therefore, this instability can be minimized by controlling the volume change rate of the first and second piston pump groups. For example, when switching from discharge from the first to the second piston pump group, the volume change rate of the first piston pump group can be appropriately slowed down to reduce the discharged flow rate. Conversely, the volume change rate of the second piston pump group can be increased to quickly transition from fluid intake to discharge. It's understood that many other aspects can be controlled, with the ultimate goal of maintaining a stable flow rate. Preset values ​​can be set according to the specific usage scenario.

[0121] Understandably, when the drive component 50 is a stepper motor or a servo motor, the rate of volume change of the piston pump assembly can be precisely adjusted.

[0122] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the technical solutions contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A circulating pump for vacuum pipelines, characterized in that, include: The first piston pump assembly includes a first piston pump, a first pipe, and a second pipe; the first piston pump includes a first suction port and a first discharge port respectively connected to the first pipe and the second pipe; the first pipe and the second pipe are respectively provided with a first valve and a second valve; The second piston pump assembly includes a second piston pump, a third pipe, and a fourth pipe; the second piston pump includes a second suction port and a second discharge port respectively connected to the third pipe and the fourth pipe; the third pipe and the fourth pipe are respectively provided with a third valve and a fourth valve; Both the second pipe and the fourth pipe are connected to the main discharge pipe of the circulating pump; The control unit is configured to control the working processes of the first piston pump assembly and the second piston pump assembly to be staggered during operation, so that the main discharge pipe can continuously discharge fluid.

2. The circulating pump for vacuum pipelines according to claim 1, characterized in that, The piston pump includes: Pump cylinder; The piston rod has a piston at one end and extends out of the pump cylinder at the other end; A telescopic tube is sleeved on the portion of the piston rod located outside the pump cylinder and can extend and retract as the piston rod moves; one end of the telescopic tube is sealed to the pump cylinder, and the other end is sealed to the outward end face of the piston rod; the piston pump includes a first piston pump and a second piston pump.

3. The circulating pump for vacuum pipelines according to claim 2, characterized in that, The piston pump assembly also includes: The pump cylinder is located at one end of the base; The lead screw is parallel to the piston rod and can rotate along its own axis; The pusher is provided with a nut that mates with the lead screw; the pusher and the piston rod are linked axially with the lead screw; A driving component is provided to drive the lead screw to rotate, and the driving component is located at the other end of the base; the piston pump assembly includes a first piston pump assembly and a second piston pump assembly.

4. The circulating pump for vacuum pipelines according to claim 3, characterized in that, The piston pump assembly also includes: The first flange is connected to the piston rod and the outward-facing end face of the telescopic tube, respectively, so that the other end of the telescopic tube is sealed to the outward-facing end face of the piston rod; The first flange is also connected to the pusher so that the pusher and the piston rod are axially linked in the lead screw.

5. The circulating pump for vacuum pipelines according to claim 4, characterized in that, The pusher includes a push plate located between the first flange and the pump cylinder; the telescopic tube and the piston rod both pass through the push plate and are connected to the first flange.

6. The circulating pump for vacuum pipelines according to claim 5, characterized in that, The base includes: Base plate; The first vertical plate is disposed at one end of the base plate near the pump cylinder and is used to fix the pump cylinder. The second vertical plate is located at the other end of the base plate away from the pump cylinder and is used to fix the drive component; the two ends of the lead screw are respectively rotatably mounted on the first vertical plate and the second vertical plate.

7. The circulating pump for vacuum pipelines according to claim 6, characterized in that, The piston pump assembly also includes: The guide rod is fixed at both ends to the first vertical plate and the second vertical plate respectively, and passes through the push plate. The push plate has a guide hole that cooperates with the guide rod.

8. The circulating pump for vacuum pipelines according to claim 3, characterized in that, The piston pump assembly may further include: The second flange has the telescopic pipe and the pump cylinder connected to its two ends respectively, so that the telescopic pipe and the pump cylinder are sealed together.

9. The circulating pump for vacuum pipelines according to claim 2, characterized in that, The telescopic tube is a metal corrugated pipe.

10. The circulating pump for a vacuum pipeline according to claim 3, characterized in that, The drive components are arranged on the side away from the pump cylinder or on the same side of the pump cylinder.

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