Circulating pump for vacuum pipeline and control method thereof

Abstract

The invention relates to a circulating pump for a vacuum pipeline and a control method of the circulating pump, 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] The present application relates to the technical field of super vaporization / boiling heat exchange, and in particular to a circulation pump for a vacuum pipeline and a control method thereof. Background Art

[0002] In the existing super vaporization / boiling heat exchange technology, the fluid medium, such as water, generally flows in a low vacuum pipe.

[0003] However, under low vacuum conditions, most circulating water pumps have problems with unstable or large fluctuations in flow. Summary of the invention

[0004] In view of this, the present application provides a circulation pump for a vacuum pipeline and a control method thereof to solve at least one problem existing in the background technology.

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

[0006] In a first aspect, an embodiment of the present application provides a circulating pump for a vacuum pipeline, comprising:

[0007] The first piston pump group comprises a first piston pump, a first pipeline and a second pipeline; the first piston pump comprises a first suction port and a first discharge port connected to the first pipeline and the second pipeline respectively; the first pipeline and the second pipeline are respectively provided with a first valve and a second valve;

[0008] The second piston pump group includes 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 connected to the third pipeline and the fourth pipeline respectively; the third pipeline and the fourth pipeline are respectively provided with a third valve and a fourth valve;

[0009] The second pipeline and the fourth pipeline are both connected to the main discharge pipe of the circulation pump;

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

[0011] Optionally, the piston pump comprises:

[0012] Pump cylinder;

[0013] A piston rod, one end of which is provided with a piston, and the other end of which passes through the pump cylinder;

[0014] A telescopic tube is sleeved on the portion of the piston rod located outside the pump cylinder and can be telescopic with the movement of the piston rod; one end of the telescopic tube is sealed connected to the pump cylinder, and the other end is sealed connected to the outward end surface of the piston rod; the piston pump includes the first piston pump and the second piston pump.

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

[0016] A base, wherein the pump cylinder is located at one end of the base;

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

[0018] A pusher is provided with a nut matched with the screw rod; the pusher and the piston rod are linked in the axial direction of the screw rod;

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

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

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

[0022] The first flange is also connected to the pushing member so that the pushing member and the piston rod are linked in the axial direction of the screw rod.

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

[0024] Optionally, the base comprises:

[0025] Base plate;

[0026] A first vertical plate, arranged at one end of the bottom plate close to the pump cylinder, for fixing the pump cylinder;

[0027] The second vertical plate is arranged at the other end of the bottom plate away from the pump cylinder and is used to fix the driving component; the two ends of the screw rod are rotatably arranged on the first vertical plate and the second vertical plate respectively.

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

[0029] The guide rod has two ends respectively fixed on the first vertical plate and the second vertical plate, and is passed through the push plate. The push plate is provided with a guide hole matched with the guide rod.

[0030] In a second aspect, an embodiment of the present application provides a method for controlling the circulation pump as described above, the method comprising:

[0031] During operation, the working processes of the first piston pump group and the second piston pump group are controlled to be staggered so that the main discharge pipe can continuously discharge fluid.

[0032] Optionally, the step of controlling the working processes of the first piston pump group and the second piston pump group to be staggered so that the main discharge pipe can continuously discharge fluid comprises:

[0033] Opening the first valve, starting the driving component of the first piston pump group, driving the piston of the first piston pump to move in a first direction, so as to expand the volume of the chamber connected between the pump cylinder and the first pipeline;

[0034] The first valve is closed, and the second valve is opened to drive the piston of the first piston pump to move in a second direction; the second direction is opposite to the first direction;

[0035] While closing the first valve, opening the third valve, starting the driving component of the second piston pump group, driving the piston of the second piston pump to move in the first direction, so as to expand the volume of the chamber connected between the pump cylinder and the third pipeline;

[0036] closing the third valve, opening the fourth valve, and driving the piston of the second piston pump to move in a second direction;

[0037] While closing the third valve, return to the top step and execute again, and execute in this order in a cycle.

[0038] Optionally, the method further comprises:

[0039] During operation, the volume change rates of the first piston pump group and the second piston pump group are controlled so that the difference in flow rate of the total discharge pipe of the circulation pump at different times is less than a preset value.

[0040] The circulating pump for vacuum pipeline and the control method thereof provided by the embodiment of the present application include: a first piston pump group, including 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 connected to the first pipeline and the second pipeline respectively; the first pipeline and the second pipeline are respectively provided with a first valve and a second valve; the second piston pump group includes 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 connected to the third pipeline and the fourth pipeline respectively; 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 total discharge pipe of the circulating pump; the control component is configured to control the working processes of the first piston pump group and the second piston pump group to be staggered during operation, so that the total discharge pipe can continuously discharge fluid. It can be seen that the circulating pump for vacuum pipeline and the control method thereof of the embodiment of the present application, by setting two piston pump groups, on the one hand, the sealing performance of the piston pump is better, which is conducive to the stability of the flow; on the other hand, the fluid can be continuously discharged by the alternating discharge of the two piston pumps. Therefore, the circulating pump for vacuum pipeline and the control method thereof of the embodiment of the present application can improve the problem of unstable flow of the circulating pump in the vacuum pipeline.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0043] Figure 1 A schematic diagram of the structural principle of a circulating pump for a vacuum pipeline provided in an embodiment of the present application;

[0044] Figure 2 A three-dimensional schematic diagram of a circulation pump for a vacuum pipeline provided in an embodiment of the present application;

[0045] Figure 3 A cross-sectional schematic diagram of a circulation pump for a vacuum pipeline provided in an embodiment of the present application;

[0046] Figure 4 Schematic diagram of a circulating pump for a vacuum pipeline provided in an embodiment of the present application after being connected to the pipeline Figure 1 ;

[0047] Figure 5 Schematic diagram of a circulating pump for a vacuum pipeline provided in an embodiment of the present application after being connected to the pipeline Figure 2 ;

[0048] Figure 6 A schematic flow chart of a method for controlling a circulating pump provided in an embodiment of the present application;

[0049] Figure 7 A detailed flow chart of a method for controlling a circulating pump provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 11. First piston pump; 111. Pump cylinder; 112. Piston rod; 113. Telescopic tube; 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. Bottom plate; 32. First vertical plate; 33. Second vertical plate; 34. Bearing; 35. Guide rod; 41. Screw rod; 42. Pushing member; 421. Nut; 50. Driving component; 61. First flange; 62. Second flange. DETAILED DESCRIPTION

[0052] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The 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 the present application belongs.

[0053] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0054] In this application, the terms "first" and "second" are used only for the purpose of clear description and should not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the 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 clearly and specifically defined.

[0055] In this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “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 horizontal height of the first feature is higher than the horizontal height of 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 horizontal height of the first feature is lower than the horizontal height of the second feature.

[0057] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0058] The applicant of this application found in the research and development that the reason why the circulating water pump has unstable or fluctuating flow rate under low vacuum conditions is that most circulating water pumps have poor negative pressure / vacuum tightness and are prone to air leakage, resulting in unstable or fluctuating flow rate supply. Circulating water pumps with better tightness, such as magnetic drive pumps, are prone to cavitation, which also leads to unstable flow rate.

[0059] Therefore, after further research and development by the applicant, the following technical solution was proposed.

[0060] In view of the technical problems in the related art, the present application provides a circulating pump for a vacuum pipeline. Figure 1-Figure 3 , the circulating pump for the vacuum pipeline comprises:

[0061] The first piston pump group includes a first piston pump 11, a first pipeline 12 and a second pipeline 13; the first piston pump 11 includes a first suction port 114 and a first discharge port 115 connected to the first pipeline 12 and the second pipeline 13 respectively; the first pipeline 12 and the second pipeline 13 are respectively provided with a first valve 14 and a second valve 15;

[0062] The second piston pump group includes a second piston pump 21, a third pipeline 22 and a fourth pipeline 23; the second piston pump 21 includes a second suction port 214 and a second discharge port 215 connected to the third pipeline 22 and the fourth pipeline 23 respectively; the third pipeline 22 and the fourth pipeline 23 are respectively provided with a third valve 24 and a fourth valve 25;

[0063] The second pipeline 13 and the fourth pipeline 23 are both connected to the main discharge pipe 16 of the circulation pump;

[0064] The control component is configured to control the working processes of the first piston pump group and the second piston pump group to be staggered during operation, so that the main discharge pipe 16 can continuously discharge fluid.

[0065] It should be noted that the structures of the first piston pump group and the second piston pump group are the same. Therefore, in order to make the introduction more concise, in the following introduction, sometimes the first and the second are not distinguished, but a general term is used. For example, the piston pump group is used as a general term for the first piston pump group and the second piston pump group, and the piston pump is used as a general term for the first piston pump 11 and the second piston pump 21. Other similar ones are also treated in this way and are not listed one by one.

[0066] It can be understood that the piston pump sucks or discharges fluid by causing a change in the internal volume of the piston pump through the movement of the piston. The movement of the piston can be displacement.

[0067] It can be understood that the suction port and the discharge port can be at the same end of the piston pump, and the suction and discharge are staggered.

[0068] It can be understood that the second pipe 13 and the fourth pipe 23 are both discharge ports of the piston pumps, so both pipes are connected to the main discharge pipe 16, and the main discharge pipe 16 can continuously discharge fluid through the alternating discharge of the two piston pumps. Specifically, the main discharge pipe 16 is provided with a main discharge port.

[0069] Furthermore, the first pipeline 12 and the third pipeline 22 may be connected to a main input pipe for inputting fluid, so that the main input pipe can continuously input fluid, and the first pipeline 12 and the third pipeline 22 may be input alternately by controlling the first valve 14 and the third valve 24 .

[0070] It can be understood that the working processes of the first piston pump group and the second piston pump group are staggered during operation, which can be achieved by staggering the suction and discharge processes of the two piston pump groups. For example, when the first piston pump group is inhaling, the second piston pump group is discharging. In this way, the total discharge pipe 16 always has a stable flow discharge.

[0071] The circulating pump for a vacuum pipeline and the control method thereof of the embodiment of the present application are provided with two piston pump groups. On the one hand, the sealing performance of the piston pump is better, which is conducive to flow stability; on the other hand, the fluid can be continuously discharged through the alternating discharge of the two piston pumps.

[0072] In other embodiments of the present application, the piston pump may include:

[0073] Pump cylinder 111;

[0074] A piston rod 112, one end of which is provided with a piston, and the other end of which passes through the pump cylinder 111;

[0075] The telescopic tube 113 is sleeved on the portion of the piston rod 112 located outside the pump cylinder 111 and can be extended and retracted as the piston rod 112 moves; one end of the telescopic tube 113 is sealedly connected to the pump cylinder 111, and the other end is sealedly connected to the outward end surface of the piston rod 112; the piston pump includes the first piston pump 11 and the second piston pump 21.

[0076] It is understandable that the arrangement of the telescopic tube 113 in the present embodiment makes the piston pump of the present embodiment different from a general piston pump. Specifically, the telescopic tube 113 may be in a vacuum environment. Since one end of the telescopic tube 113 is sealedly connected to the pump cylinder 111, and the other end is sealedly connected to the outward end surface of the piston rod 112, the movement of the piston rod 112 will not change the vacuum environment in the telescopic tube 113. It is understandable that the vacuum environment may be a relative vacuum, and the vacuum degree may be maintained at the user's requirement. In the present embodiment, the vacuum environment in the telescopic tube 113 may be a low vacuum, also called a rough vacuum. Specifically, the telescopic tube 113 may be a metal bellows. Metal bellows are more durable and have a long service life.

[0077] Specifically, the intersection angle of the bellows is 45 degrees. With an intersection angle of 45 degrees, it has a larger deformation capacity (i.e., expansion and contraction capacity) and a longer service life.

[0078] Specifically, the material of the bellows is 316L stainless steel.

[0079] 316L stainless steel has high strength and strong corrosion resistance, especially good corrosion resistance at high temperatures.

[0080] In some other embodiments of the present application, the piston pump assembly may further include:

[0081] A base 30, wherein the pump cylinder 111 is located at one end of the base 30;

[0082] The screw rod 41 is parallel to the piston rod 112 and can rotate along its own axis;

[0083] The pusher 42 is provided with a nut 421 that cooperates with the screw rod 41; the pusher 42 and the piston rod 112 are linked in the axial direction of the screw rod 41;

[0084] The driving component 50 can drive the screw rod 41 to rotate, and the driving component 50 is located at the other end of the base 30; the piston pump group includes a first piston pump group and the second piston pump group.

[0085] The rotation of the driving component 50 can be converted into linear movement by the screw rod 41 and the screw nut 421, and the moving distance has high precision. Therefore, by setting the screw rod 41 and the screw nut 421, the amount of fluid pumped out by the piston pump group can be better controlled.

[0086] The pusher 42 and the piston rod 112 are linked in the axial direction of the screw rod 41, that is, the pusher 42 moves along the axial direction of the screw rod 41, and the piston rod 112 moves accordingly. The linkage can be established by directly fixing them together by interference fit, welding, etc., or by connecting them by other connecting parts, such as couplings.

[0087] Specifically, the driving component 50 may be a motor. More specifically, the driving component 50 may be a stepping motor or a servo motor, so that the rotation speed can be adjusted as required.

[0088] In some other embodiments of the present application, the piston pump assembly may further include:

[0089] The first flange 61 is connected to the outward end surface of the piston rod 112 and the telescopic tube 113 respectively, so that the other end of the telescopic tube 113 is sealed and connected to the outward end surface of the piston rod 112;

[0090] The first flange 61 is also connected to the pushing member 42 so that the pushing member 42 and the piston rod 112 are linked in the axial direction of the screw rod 41 .

[0091] It can be understood that the first flange 61 can be a connecting intermediate member, connecting the outward end faces of the piston rod 112 and the telescopic tube 113 respectively, so that the piston rod 112 and the telescopic rod can move in tandem. The telescopic tube 113 is sleeved outside the piston rod 112 and seals the piston rod 112 through the first flange 61.

[0092] Specifically, the piston pump group may also include:

[0093] The second flange 62 has two ends connected to the telescopic tube 113 and the pump cylinder 111, respectively, so that the telescopic tube 113 and the pump cylinder 111 are sealed and connected, so that the piston rod 112 is sealed in the telescopic tube 113, and the vacuum environment of the telescopic tube 113 is more easily maintained.

[0094] In some other embodiments of the present application, the pushing member 42 includes a push plate, which is located between the first flange 61 and the pump cylinder 111 ; the telescopic tube 113 and the piston rod 112 are both connected to the first flange 61 through the push plate.

[0095] It can be understood that the push plate is provided to facilitate the telescopic tube 113 and the piston rod 112 to pass through the pushing member 42, and the push plate has a small moving inertia, so that the energy required to drive the screw rod 41 is smaller.

[0096] In some other embodiments of the present application, the base 30 includes:

[0097] Bottom plate 31;

[0098] A first vertical plate 32 is disposed at one end of the bottom plate 31 close to the pump cylinder 111 and is used to fix the pump cylinder 111;

[0099] The second vertical plate 33 is disposed at the other end of the bottom plate 31 away from the pump cylinder 111 and is used to fix the driving component 50 ; the two ends of the screw rod 41 are rotatably disposed on the first vertical plate 32 and the second vertical plate 33 .

[0100] It can be understood that the first vertical plate 32 and the second vertical plate 33 respectively support the two ends of the screw rod 41 to enable the screw rod 41 to rotate smoothly. Specifically, the first vertical plate 32 and the second vertical plate 33 are respectively provided with bearings 34 for supporting the screw rod 41. In this way, the resistance to the rotation of the screw rod 41 can be reduced, and the stability of the rotation of the screw rod 41 can be further improved.

[0101] In some other embodiments of the present application, the piston pump assembly further includes:

[0102] The guide rod 35 has two ends respectively fixed on the first vertical plate 32 and the second vertical plate 33 and is passed through the push plate. The push plate is provided with a guide hole matched with the guide rod 35 .

[0103] The cooperation between the guide rod 35 and the guide hole can improve the straightness of the moving direction of the push plate, which makes the flow rate discharged by the piston pump group more stable. In addition, the guide rod 35 also plays a role in supporting the push plate, which can make the nut 421 on the push plate and the screw rod 41 cooperate better, further improving the stability of the push plate movement.

[0104] Further, refer to Figure 4 and Figure 5 The drive component 50 in the circulating pump for the vacuum pipeline can be arranged in two ways, one is as follows: Figure 4 As shown in FIG. 1 , the driving component 50 is arranged on a side away from the pump cylinder 111, so that there is no mutual interference between the driving component 50 and the pump cylinder 111. Figure 5 As shown, the drive component 50 is arranged on the same side of the pump cylinder 111. In this way, the structure of the circulation pump is more compact. It can be understood that there can also be other arrangements.

[0105] Furthermore, it can be understood that other components may also be arranged in a variety of ways, which will not be described in detail.

[0106] The present application also provides a control method for the circulation pump described above, referring to Figure 6 , the method comprising:

[0107] Step 801: During operation, the working processes of the first piston pump group and the second piston pump group are controlled to be staggered so that the main discharge pipe 16 can continuously discharge fluid.

[0108] It can be understood that the working processes of the first piston pump group and the second piston pump group are staggered during operation, which can be achieved by staggering the suction and discharge processes of the two piston pump groups. For example, when the first piston pump group is inhaling, the second piston pump group is discharging. In this way, the total discharge pipe 16 always has a stable flow discharge.

[0109] In other embodiments of the present application, reference Figure 7 The method of controlling the working processes of the first piston pump group and the second piston pump group to be staggered so that the main discharge pipe 16 can continuously discharge fluid includes:

[0110] Step 8011: open the first valve 14, start the driving component 50 of the first piston pump group, drive the piston of the first piston pump 11 to move in a first direction, so as to expand the volume of the chamber connected between the pump cylinder 111 and the first pipe 12.

[0111] It can be understood that when the first valve 14 is opened, the first suction port 114 is connected to the first pipeline 12. The piston moves in the first direction, the volume of the chamber connecting the pump cylinder 111 and the first pipeline 12 is increased, and the fluid in the first pipeline 12 is sucked.

[0112] The first direction is Figure 1 Specifically, the forward rotation of the lead screw 41 can be achieved by driving the lead screw 41 with a motor.

[0113] 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.

[0114] The second valve 15 is opened, and the second pipe 13 is connected to the first outlet 115. The piston moves in the second direction, and the volume of the chamber connecting the pump cylinder 111 and the first pipe 12 is reduced. 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.

[0115] The second direction is Figure 2 Specifically, the motor can be driven to reverse the screw rod 41. Both forward and reverse rotation can be preset and can be achieved by the rotation direction of the screw rod 41 and the screw nut 421, so that the piston is to the left during forward rotation and to the right during reverse rotation.

[0116] Step 8013: While closing the first valve 14, open the third valve 24, start the driving component 50 of the second piston pump group, and drive the piston of the second piston pump 21 to move in the first direction to expand the volume of the chamber connected to the pump cylinder 111 and the third pipe 22.

[0117] The third valve 24 is opened, and the second suction port 214 is connected to the third pipeline 22. The piston moves in the first direction, the volume of the chamber connecting the pump cylinder 111 and the third pipeline 22 is increased, and the fluid in the third pipeline 22 is sucked.

[0118] That is, when the first piston pump group discharges fluid through the second pipeline 13, the second piston pump group sucks fluid through the third pipeline 22. This is what is said above, that the working processes are staggered.

[0119] 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.

[0120] The fourth valve 25 is opened, and the fourth pipeline 23 is connected to the second outlet 215. The piston moves in the second direction, and the volume of the chamber connecting the pump cylinder 111 and the fourth pipeline 23 is reduced. Since the third valve 24 is closed, the fluid in the chamber is forced to flow into the fourth pipeline 23 through the second outlet 215.

[0121] While closing the third valve 24, the process returns to step 8011 and executes the process again, and the process is repeated in this order.

[0122] That is, when the second piston pump group discharges fluid through the fourth pipeline 23, the first piston pump group sucks fluid through the first pipeline 12, and the working processes are staggered.

[0123] The above steps are cyclically performed so that the main discharge pipe 16 can continuously discharge the fluid.

[0124] In some other embodiments of the present application, the method further includes:

[0125] During operation, the volume change rates of the first piston pump group and the second piston pump group are controlled so that the difference in flow rate of the total discharge pipe 16 of the circulation pump at different times is less than a preset value.

[0126] Since the first piston pump group and the second piston pump group discharge the fluid alternately, the circulating pump can discharge the fluid continuously. However, at the moment of switching between the first piston pump group and the second piston pump group, the flow rate may be temporarily unstable. Therefore, the volume change rate of the first piston pump group and the second piston pump group can be controlled to adjust the flow rate to minimize the instability of the flow at the moment of switching. For example, when switching from the discharge of the first piston pump group to the discharge of the second piston pump group, the volume change rate of the first piston pump group can be appropriately slowed down to appropriately reduce the discharge flow rate. Correspondingly, the volume change rate of the second piston pump group can be increased to change from sucking in the fluid to discharging the fluid as soon as possible. It can be understood that there are many aspects that can be controlled in order to maintain a stable flow rate. The preset value can be set according to the specific usage scenario.

[0127] It can be understood that when the driving component 50 is a stepping motor or a servo motor, the volume change rate of the piston pump group can be accurately adjusted.

[0128] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the technical solution of the present application. Various modifications and changes can also be made on the basis of the above embodiments without departing from the scope disclosed in the present application. Similarly, the various technical features of the above embodiments can also be combined arbitrarily to form other embodiments of the present application that may not be clearly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

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

2. The circulating pump for a vacuum pipeline according to claim 1, characterized in that: The piston pump comprises: Pump cylinder; A piston rod, one end of which is provided with a piston and the other end of which passes through the pump cylinder; A telescopic tube is sleeved on the portion of the piston rod located outside the pump cylinder and can be telescopic with the movement of the piston rod; one end of the telescopic tube is sealed connected to the pump cylinder, and the other end is sealed connected to the outward end surface of the piston rod; the piston pump includes the first piston pump and the second piston pump.

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

4. The circulating pump for a vacuum pipeline according to claim 3, characterized in that: The piston pump assembly also includes: A first flange is connected to the piston rod and the outward end surface of the telescopic tube respectively, so that the other end of the telescopic tube is sealed and connected to the outward end surface of the piston rod; The first flange is also connected to the pushing member so that the pushing member and the piston rod are linked in the axial direction of the screw rod.

5. The circulating pump for vacuum pipeline according to claim 4, characterized in that: The pushing member comprises a pushing plate, and the pushing plate is located between the first flange and the pump cylinder; the telescopic tube and the piston rod are both connected to the first flange through the pushing plate.

6. The circulating pump for vacuum pipeline according to claim 5, characterized in that: The base comprises: Base plate; A first vertical plate, disposed at one end of the bottom plate close to the pump cylinder, for fixing the pump cylinder; The second vertical plate is arranged at the other end of the bottom plate away from the pump cylinder and is used to fix the driving component; the two ends of the screw rod are rotatably arranged on the first vertical plate and the second vertical plate respectively.

7. The circulating pump for a vacuum pipeline according to claim 6, characterized in that: The piston pump assembly also includes: The guide rod has two ends respectively fixed on the first vertical plate and the second vertical plate, and is passed through the push plate. The push plate is provided with a guide hole matched with the guide rod.

8. A method for controlling a circulating pump according to any one of claims 1 to 7, characterized in that: The method comprises: During operation, the working processes of the first piston pump group and the second piston pump group are controlled to be staggered so that the main discharge pipe can continuously discharge fluid.

9. The control method of the circulation pump according to claim 8, characterized in that: The method of controlling the working processes of the first piston pump group and the second piston pump group to be staggered so that the main discharge pipe can continuously discharge fluid comprises: Opening the first valve, starting the driving component of the first piston pump group, driving the piston of the first piston pump to move in a first direction, so as to expand the volume of the chamber connected between the pump cylinder and the first pipeline; The first valve is closed, and the second valve is opened to drive the piston of the first piston pump to move in a second direction; the second direction is opposite to the first direction; While closing the first valve, opening the third valve, starting the driving component of the second piston pump group, driving the piston of the second piston pump to move in the first direction, so as to expand the volume of the chamber connected between the pump cylinder and the third pipeline; closing the third valve, opening the fourth valve, and driving the piston of the second piston pump to move in a second direction; While closing the third valve, return to the top step and execute again, and execute in this order in a cycle.

10. The control method of the circulation pump according to claim 9, characterized in that: The method further comprises: During operation, the volume change rates of the first piston pump group and the second piston pump group are controlled so that the difference in flow rate of the total discharge pipe of the circulation pump at different times is less than a preset value.

Images