Ferrofluid displacement pump of contact type one-way valve

Abstract

The invention relates to a ferrofluid positive displacement pump of a contact type one-way valve, belongs to the technical field of pump bodies, and solves the technical problem that the sealing effect is poor when an existing magnetofluid driving pump is used for a long time. The ferrofluid displacement pump of the contact type one-way valve comprises a pump body, a ferrofluid piston and the contact type one-way valve, the pump body is provided with an inlet allowing fluid to enter and an outlet allowing fluid to be discharged, the inlet is communicated with the outlet, and a cavity is formed in the pump body; the ferrofluid piston is installed in the cavity in a sliding mode, a cavity used for pumping fluid is formed between the ferrofluid piston and the inlet and between the ferrofluid piston and the outlet, and the ferrofluid moves along the cavity to change the size of the cavity so as to suck in or pump out the fluid; and the two contact type one-way valves are respectively mounted at the inlet and the outlet. Therefore, according to the ferrofluid positive displacement pump with the contact type one-way valves, the contact type one-way valves are used for sealing the inlet and the outlet, the possibility that the sealing effect is reduced due to long-time pumping is reduced, and the pumping stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pump bodies, and in particular relates to a ferromagnetic fluid displacement pump with a contact-type one-way valve. Background Art

[0002] Magnetic fluid driven pump technology has undergone significant development, with a wide range of pump types designed and developed to meet diverse application requirements. These pumps have demonstrated broad application potential in fluid transfer, chemical processing, medical equipment, and other industrial fields.

[0003] During the reciprocating pumping cycle, some fluid may flow back in the opposite direction of the pumping process. This not only reduces pumping efficiency but can also lead to energy waste and reduced system performance. To mitigate this backflow, ferrofluid self-sealing technology is often used. This technology utilizes the magnetic force generated by permanent magnets to form a fluid mass within the pump body, thereby providing a seal and reducing or preventing backflow.

[0004] However, the shape of the ferrofluid mass depends on the magnitude and direction of the magnetic force of the permanent magnet. When the magnetic force of the permanent magnet changes, or the shape of the fluid mass changes due to disturbances in the fluid inside the pump body, the effect of the ferrofluid mass in suppressing backflow will weaken. At the same time, as the pumping time continues, part of the ferrofluid will be pumped out of the pump body during the pumping process and will not be able to return, causing the total amount of ferrofluid in the pump body to gradually decrease, resulting in a reduction in the sealing effect. Summary of the Invention

[0005] The present invention provides a ferrofluid displacement pump with a contact-type one-way valve, which is used to solve the technical problem that the current magnetic fluid driven pump has a poor sealing effect after long-term use.

[0006] The present invention is achieved through the following technical solutions: a ferromagnetic fluid displacement pump with a contact one-way valve includes a pump body, a ferromagnetic fluid piston and a contact one-way valve, the pump body having an inlet for fluid entry and an outlet for fluid discharge, the inlet being connected to the outlet, and a cavity being provided in the pump body; the ferromagnetic fluid piston is slidably installed in the cavity, a cavity for pumping fluid is formed between the ferromagnetic fluid piston and the inlet and the outlet, the ferromagnetic fluid moves along the cavity to change the size of the cavity so as to inhale or pump out the fluid; two contact one-way valves are respectively installed at the inlet and the outlet, the contact one-way valve at the inlet is used to allow the fluid to flow from the inlet into the cavity in one direction, and the contact one-way valve at the outlet is used to allow the fluid to flow from the cavity out of the outlet in one direction.

[0007] Optionally, the contact-type one-way valve includes a valve body, a block, and a baffle, the valve body having a through hole connected at both ends so that the fluid enters the inlet through the through hole or is discharged from the outlet through the through hole; the block is installed in the through hole, and a channel for the fluid to pass through is provided between the block and the inner wall of the valve body; the baffle is rotatably installed in the through hole and is located on one side of the block, and the baffle abuts against the block to block the channel.

[0008] Optionally, the cavity includes a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are connected to each other, the ferromagnetic fluid piston is slidably installed in the third cavity, and the ferromagnetic fluid piston moves along the axial direction of the third cavity to suck the fluid of the first cavity into the third cavity or to send the fluid of the third cavity into the second cavity for delivery.

[0009] Optionally, the third cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity are respectively located at two ends of the ferrofluid piston, and the first sub-cavity is connected to the first cavity and the second cavity.

[0010] Optionally, the pump body includes a first pump body and a second pump body, the two ends of the first pump body are the inlet and the outlet respectively, a chamber is provided between the inlet and the outlet along the axial direction of the first pump body, and the chamber is communicated with the inlet and the outlet; the second pump body is installed on the first pump body, the second pump body is perpendicular to the first pump body, the third cavity is provided in the second pump body, the third cavity is communicated with the cavity, and the second pump body divides the cavity into the first cavity close to the inlet and the second cavity close to the outlet.

[0011] Optionally, an air hole is formed on the second pump body, and the air hole is communicated with the second sub-cavity.

[0012] Optionally, a driving assembly is further included, which is installed on one side of the pump body and is used to drive the piston to move along the first pump body.

[0013] Optionally, the drive assembly includes a guide rail, a carrier, a screw, and a drive motor, and the guide rail is installed on one side of the second pump body; the carrier is slidably installed on the guide rail, and a permanent magnet for driving the ferrofluid piston to move is provided on the carrier; the screw is rotatably installed on the carrier and is transmission-connected to the permanent magnet, and the screw rotates to drive the carrier to move along the axial direction of the screw, and the axial direction of the screw is parallel to the axial direction of the second pump body; the drive motor is transmission-connected to the screw to drive the screw to rotate.

[0014] Optionally, guide grooves are provided on both sides of the guide rail, and the carrier is slidably installed in the guide grooves.

[0015] Optionally, the driving assembly further includes a pulley, which is rotatably mounted on the carrier, and the pulley is located in the guide groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a ferromagnetic fluid displacement pump with a contact one-way valve, which includes a pump body, a ferromagnetic fluid piston and a contact one-way valve. The pump body has an inlet for fluid entry and an outlet for fluid discharge, the inlet and the outlet are connected, and a cavity is provided in the pump body; the ferromagnetic fluid piston is slidably installed in the cavity, and a cavity for pumping fluid is formed between the ferromagnetic fluid piston and the inlet and the outlet. The ferromagnetic fluid moves along the cavity to change the size of the cavity so as to inhale or pump out the fluid; two contact one-way valves are respectively installed at the inlet and the outlet, the contact one-way valve at the inlet is used to allow the fluid to flow from the inlet into the cavity in one direction, and the contact one-way valve at the outlet is used to allow the fluid to flow from the cavity to the outlet in one direction.

[0018] Through the above structure, the ferrofluid displacement pump of a contact one-way valve provided by the present invention is in use, the ferrofluid piston is located in the cavity, the inlet of the pump body is connected to the fluid source, and then the ferrofluid piston moves along the cavity, the outlet of the pump body is sealed by the contact one-way valve, the space of the cavity increases, thereby reducing the pressure in the cavity, the fluid enters the cavity from the inlet through the contact one-way valve to balance the pressure inside and outside the pump body, as the ferrofluid piston continues to move, the fluid increases, and the fluid is temporarily stored in the cavity, when the ferrofluid piston moves one end of the cavity, the ferrofluid piston moves in the opposite direction, pushing the fluid in the cavity to move, and the fluid in the cavity flows out of the outlet through the contact one-way valve near the outlet, and the contact one-way valve near the inlet blocks the fluid from flowing out of the inlet. Therefore, the ferrofluid displacement pump of the contact one-way valve uses the contact one-way valve to seal the inlet and outlet, reducing the possibility of reduced sealing effect due to long-term pumping and increasing pumping stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural schematic diagram of a ferrofluid displacement pump with a contact-type one-way valve provided by the present invention;

[0021] Figure 2This is a schematic structural diagram of a ferrofluid displacement pump for sucking fluid into a contact-type one-way valve provided by the present invention;

[0022] Figure 3 This is a schematic structural diagram of a ferrofluid displacement pump for pumping out fluid using a contact-type one-way valve provided by the present invention;

[0023] Figure 4 1 is a schematic structural diagram of a contact-type one-way valve according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the installation structure of the contact-type one-way valve at the inlet in an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the installation structure of the contact-type one-way valve at the outlet of an embodiment of the present invention;

[0026] Figure 7 is a schematic structural diagram of a drive assembly in an embodiment of the present invention;

[0027] Figure 8 2 is another structural diagram of the driving component in an embodiment of the present invention.

[0028] In the picture:

[0029] 1- pump body; 11- first pump body; 111- inlet; 112- outlet; 12- second pump body; 121- air hole; 13- first cavity; 14- second cavity; 15- third cavity; 151- first sub-cavity; 152- second sub-cavity;

[0030] 2- ferrofluid piston;

[0031] 3-contact one-way valve; 31-valve body; 32-stopper; 33-baffle;

[0032] 4-driving assembly; 41-guide rail; 411-guide groove; 42-carrier; 43-lead screw; 44-driving motor; 45-pulley; 5-permanent magnet. DETAILED DESCRIPTION

[0033] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0037] The present invention provides a ferrofluid displacement pump with a contact-type one-way valve, which solves the technical problem of poor sealing effect of current ferrofluid driven pumps after long-term use. The ferrofluid displacement pump with a contact-type one-way valve comprises a pump body 1, a ferrofluid piston 2, and a contact-type one-way valve 3, wherein:

[0038] The pump body 1 has an inlet 111 and an outlet 112. The inlet 111 is used for fluid to enter the pump body 1, and the outlet 112 is used to discharge the fluid in the pump body 1. A cavity is provided in the pump body 1 for temporarily storing the fluid to be pumped entering from the inlet 111.

[0039] The ferrofluid piston 2 is slidably installed in the cavity, and a cavity for pumping fluid is formed between the ferrofluid piston 2 and the inlet 111 and the outlet 112. The ferrofluid piston 2 changes the size of the cavity by moving in the cavity, thereby changing the pressure in the cavity, and then injecting fluid into the cavity through the inlet 111, or discharging the fluid in the cavity from the outlet 112. Specifically, when the pressure in the cavity decreases, the fluid enters the cavity, and when the pressure in the cavity increases, the fluid is discharged from the cavity from the outlet 112.

[0040] There are two contact-type one-way valves 3, which are respectively installed at the inlet 111 and the outlet 112 of the pump body 1. The contact-type one-way valve 3 of the inlet 111 is used to allow the fluid to flow into the cavity from the inlet 111 in one direction, and the contact-type one-way valve 3 of the outlet 112 is used to allow the fluid to flow out of the cavity from the outlet 112 in one direction. When the fluid enters the cavity, the contact-type one-way valve 3 of the outlet 112 blocks the fluid from being discharged from the outlet 112. When the fluid is pumped out of the cavity, the contact-type one-way valve 3 of the inlet 111 blocks the fluid from being discharged from the cavity through the outlet 112.

[0041] Through the above structure, when the ferrofluid displacement pump with a contact one-way valve provided by the present invention is in use, the ferrofluid piston 2 is located in the cavity, the inlet 111 of the pump body 1 is connected to the fluid source, and then the ferrofluid piston 2 moves along the cavity, and the outlet 112 of the pump body 1 is sealed by the contact one-way valve 3, the space of the cavity increases, thereby reducing the pressure in the cavity, and the fluid enters the cavity from the inlet 111 through the contact one-way valve 3 to balance the pressure inside and outside the pump body 1. As the ferrofluid piston 2 continues to move, the fluid increases and the fluid is temporarily stored in the cavity. When the ferrofluid piston 2 moves one end of the cavity, the ferrofluid piston 2 moves in the opposite direction, pushing the fluid in the cavity to move, and the fluid in the cavity flows out of the outlet 112 through the contact one-way valve 3 near the outlet 112, and the contact one-way valve 3 near the inlet 111 blocks the fluid from flowing out of the inlet 111. Therefore, the ferrofluid displacement pump with the contact one-way valve uses the contact one-way valve 3 to seal the inlet 111 and the outlet 112, thereby reducing the possibility of reduced sealing effect due to long-term pumping and increasing pumping stability.

[0042] An optional implementation of this embodiment is as follows: the contact-type one-way valve 3 includes a valve body 31, a stopper 32, and a baffle 33, wherein the valve body 31 has a through hole connected at both ends, and the through hole is a passage for fluid flow, so that the fluid enters the cavity through the through hole of the valve body 31 or is discharged through the through hole;

[0043] The stopper 32 is installed in the through hole. A channel is formed between the stopper 32 and the inner wall of the valve body 31. The channel is used to allow fluid to pass through the hole. Specifically, one end of the stopper 32 is installed on the inner wall of the valve body 31, and the other end of the stopper 32 forms a channel with the inner wall of the valve body 31. The side wall of the stopper 32 abuts against the inner wall of the valve body 31 so that the fluid can only flow through the channel.

[0044] The baffle 33 is rotatably mounted in the through hole, and one end of the baffle 33 is mounted on the inner wall of the through hole of the valve body 31 away from the stopper 32, that is, the baffle 33 is arranged opposite to the stopper 32, and the baffle 33 is located on one side of the stopper 32. The baffle 33 opens and closes the channel by rotating. Specifically, the baffle 33 rotates toward the side close to the stopper 32, and the baffle 33 abuts against the stopper 32. The baffle 33 abuts against the stopper 32 to block the channel. When the baffle 33 rotates toward the side away from the stopper 32, and the baffle 33 Separated from the stopper 32, so that the channel is opened to facilitate the passage of fluid; in this embodiment, the baffle 33 of the contact one-way valve 3 at the inlet 111 is located on the side close to the cavity, and the stopper 32 of the contact one-way valve 3 at the outlet 112 is located on the side close to the cavity, so that when the ferromagnetic fluid piston 2 moves in the cavity, the pressure in the cavity is reduced, thereby causing the baffle 33 of the contact one-way valve 3 at the inlet 111 to rotate in the direction away from the stopper 32, so that the baffle 33 opens the channel. The ferromagnetic fluid piston 2 moves in the cavity when the fluid in the cavity needs to be discharged, so that the pressure in the cavity increases, thereby causing the baffle 33 of the contact one-way valve 3 of the inlet 111 to rotate in the direction close to the stopper 32, so that the baffle 33 closes the channel, so as to prevent the fluid from flowing out of the channel of the contact one-way valve 3 of the inlet 111 to the outside of the cavity. At the same time, the baffle 33 of the contact one-way valve 3 of the outlet 112 moves in the direction away from the stopper 32, so that the baffle 33 opens the channel, so that the fluid flows out through the channel of the contact one-way valve 3 of the outlet 112. The baffle 33 can be a sheet structure made of PDMS material bonded to Permalloy and then removed.

[0045] An optional implementation of this embodiment is as follows: the cavity includes a first cavity 13, a second cavity 14, and a third cavity 15. The first cavity 13, the second cavity 14, and the third cavity 15 are interconnected. The ferrofluid piston 2 is slidably mounted in the third cavity 15. The ferrofluid piston 2 moves axially along the third cavity 15 to draw fluid from the first cavity 13 into the third cavity 15 or to deliver fluid from the third cavity 15 to the second cavity 14.

[0046] An optional implementation of this embodiment is as follows: the third cavity 15 includes a first sub-cavity 151 and a second sub-cavity 152, the first sub-cavity 151 and the second sub-cavity 152 are respectively located at the two ends of the ferrofluid piston 2, the first sub-cavity 151 is connected to the first cavity 13 and the second cavity 14, and the third cavity 15 is divided into a first sub-cavity 151 close to the fluid and a second sub-cavity 152 away from the fluid by the ferrofluid piston 2 in the third cavity 15. The first sub-cavity 151 is used to store the inhaled fluid, and the second sub-cavity 152 is used to move the ferrofluid piston 2. The size of the first sub-cavity 151 is changed by the movement of the ferrofluid piston 2 in the third cavity 15, thereby realizing the pumping of the fluid. The overall capacity of the first sub-cavity 151 and the second sub-cavity 152 remains unchanged. When the ferrofluid piston 2 moves to increase the first sub-chamber 151 and reduce the second sub-chamber 152, it is used to suck the fluid into the first chamber 13 through the inlet. As the ferrofluid piston 2 continues to move, the fluid continues to enter the first chamber 13. After the first chamber 13 is filled with fluid, due to the low pressure in the first sub-chamber 151, the fluid will move into the first sub-chamber 151. When the ferrofluid piston 2 moves to the end of the third chamber 15 away from the first chamber 13, the ferrofluid piston 2 moves in the opposite direction, causing the capacity of the first sub-chamber 151 to gradually decrease. The ferrofluid piston 2 pushes the fluid in the first sub-chamber 151 to move into the second chamber 14. As the ferrofluid continues to move, the fluid gradually fills the second chamber 14 and is gradually discharged from the pump body 1 through the outlet 112.

[0047] An optional implementation of this embodiment is as follows: the pump body 1 includes a first pump body 111 and a second pump body 121, the two ends of the first pump body 111 are respectively an inlet 111 and an outlet 112, and a chamber is provided between the inlet 111 and the outlet 112 along the axial direction of the first pump body 111, and the chamber is communicated with the inlet 111 and the outlet 112. The liquid to be pumped enters the chamber through the inlet 111 and is then discharged through the outlet 112; the second pump body 121 is installed on the first pump body 111, and the second pump body 121 is perpendicular to the first pump body 111. The third cavity 15 is provided in the second pump body 121, and the third cavity 15 is communicated with the cavity. The second pump body 121 divides the cavity into a first cavity 13 close to the inlet 111 and a second cavity 14 close to the outlet 112.

[0048] An optional implementation of this embodiment is as follows: an air hole 121 is opened on the second pump body 121, and the air hole 121 is connected to the second sub-cavity 152. When the ferromagnetic fluid moves along the third cavity 15, the air hole 121 is used to discharge the pressure in the second sub-cavity 152 or to suck the gas into the second sub-cavity 152 to keep the pressure in the second sub-cavity 152 constant.

[0049] An optional implementation of this embodiment is as follows: in order to drive the ferrofluid piston 2 to move, the contact-type one-way valve 3 ferrofluid displacement pump also includes a drive component 4, which is installed on one side of the pump body 1. The drive component 4 is used to drive the piston to move along the third cavity 15, thereby pumping fluid.

[0050] An optional implementation of this embodiment is as follows: the driving assembly 4 includes a carrier 42, a permanent magnet 5, a screw and a driving motor 44, a guide rail 41 is installed on one side of the second pump body 121, the carrier 42 is slidably installed on the guide rail 41, and a permanent magnet 5 is provided on the carrier 42 for driving the ferrofluid piston 2 to move. The permanent magnet 5 moves along the extension direction of the guide rail 41, and the guide rail 41 is parallel to the axial direction of the second pump body 121. The carrier 42 moves along the guide rail 41, so that the ferrofluid piston 2 follows the permanent magnet 5. Movement; the screw 43 is rotatably installed on the carrier 42, and the screw 43 is transmission-connected to the carrier 42. Specifically, the carrier 42 is provided with a thread adapted to the screw, and the carrier 42 is screwed to the screw 43. One side of the carrier 42 is in contact with the carrier 42, and the screw rotates, thereby causing the carrier 42 to move along the axial direction of the screw 43, and the axial direction of the screw is parallel to the axial direction of the second pump body 121; the drive motor 44 is transmission-connected to the screw, and the drive motor 44 is used to drive the screw to rotate, thereby driving the permanent magnet 5 to move along the screw.

[0051] An optional implementation of this embodiment is as follows: guide grooves 411 are provided on both sides of the guide rail 41, and the carrier 42 is slidably installed in the guide grooves 411. Specifically, guide grooves 411 are provided on opposite sides of the guide rail 41, and one of the guide grooves 411 is arranged opposite to the second pump body 121. The guide groove 411 can not only guide the carrier 42, but also prevent the carrier 42 from moving in a direction perpendicular to the guide groove 411.

[0052] An optional implementation of this embodiment is as follows: the driving component 4 also includes a pulley 45, which is rotatably installed on the carrier 42, and the pulley 45 is located in the guide groove 411, and the pulley 45 abuts against the bottom of the guide groove 411. When the carrier 42 moves along the guide groove 411, the pulley 45 rotates, and the pulley 45 reduces the friction between the carrier 42 and the guide groove 411, thereby making the carrier 42 move more smoothly.

[0053] In summary, when the ferrofluid displacement pump with a contact one-way valve provided by the present invention is in use, the ferrofluid piston 2 is first located in the third cavity 15 near one end of the first cavity 13 and the second cavity 14, the inlet 111 of the pump body 1 is connected to the fluid source, and then the driving motor 44 drives the screw 43 to rotate, thereby driving the carrier 42 to move, and the carrier 42 drives the permanent magnet 5 to move, so that the ferrofluid piston 2 moves along the third cavity 15, so that the pressure in the first cavity 13, the second cavity 14 and the third cavity 15 is reduced, and the fluid enters the first cavity 13, the second cavity 14 and the third cavity 15 from the inlet 111 through the contact one-way valve 3. Cavity 13, to balance the pressure inside and outside the pump body 1. As the ferrofluid piston 2 continues to move, the fluid increases, and the fluid passes through the first cavity 13 and enters the third cavity 15 for temporary storage. When the ferrofluid piston 2 moves to the end of the third cavity 15 away from the first cavity 13 and the second cavity 14, the drive motor 44 rotates in the opposite direction, thereby causing the ferrofluid piston 2 to move in the opposite direction, pushing the fluid in the third cavity 15 to move into the second cavity 14. As the ferrofluid piston 2 continues to move, the fluid in the second cavity 14 flows out of the outlet 112 through the contact one-way valve 3 near the outlet 112. Therefore, the ferrofluid positive displacement pump with the contact one-way valve uses the contact one-way valve 3 to seal the inlet 111 and the outlet 112, reducing the possibility of reduced sealing effect due to long-term pumping and increasing pumping stability.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A ferrofluid displacement pump with a contact check valve, characterized in that: include: A pump body having an inlet for fluid to enter and an outlet for fluid to be discharged, the inlet is connected to the outlet, and a cavity is provided in the pump body; A ferromagnetic fluid piston is slidably mounted in the cavity, a cavity for pumping fluid is formed between the ferromagnetic fluid piston and the inlet and the outlet, and the ferromagnetic fluid moves along the cavity to change the size of the cavity, so as to inhale or pump out the fluid; Two contact-type one-way valves are respectively installed at the inlet and the outlet. The contact-type one-way valve at the inlet is used to allow the fluid to flow from the inlet into the cavity in one direction, and the contact-type one-way valve at the outlet is used to allow the fluid to flow from the cavity to the outlet in one direction.

2. A ferromagnetic fluid displacement pump with a contact type one-way valve according to claim 1, characterized in that: The contact type one-way valve comprises: A valve body having a through hole with two ends connected, so that the fluid can enter the inlet through the through hole or be discharged from the outlet through the through hole; A stopper is installed in the through hole, and a passage for the fluid to pass through is defined between the stopper and the inner wall of the valve body; The baffle is rotatably mounted in the through hole and is located on one side of the stopper. The baffle abuts against the stopper to block the passage.

3. A ferrofluid displacement pump with a contact type one-way valve according to claim 1, characterized in that: The cavity includes a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are interconnected, the ferromagnetic fluid piston is slidably installed in the third cavity, and the ferromagnetic fluid piston moves along the axial direction of the third cavity to suck the fluid of the first cavity into the third cavity or send the fluid of the third cavity into the second cavity for delivery.

4. A ferrofluid displacement pump with a contact type one-way valve according to claim 2, characterized in that: The third cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity are respectively located at two ends of the ferrofluid piston, and the first sub-cavity is connected with the first cavity and the second cavity.

5. A ferromagnetic fluid displacement pump with a contact type one-way valve according to claim 4, characterized in that: The pump body comprises: A first pump body, with the inlet and the outlet at two ends respectively, a chamber is provided along the axial direction of the first pump body between the inlet and the outlet, and the chamber is connected with the inlet and the outlet; The second pump body is installed on the first pump body, the second pump body is perpendicular to the first pump body, the third cavity is arranged in the second pump body, the third cavity is connected with the chamber, and the second pump body divides the chamber into the first cavity close to the inlet and the second cavity close to the outlet.

6. A ferromagnetic fluid displacement pump with a contact type one-way valve according to claim 5, characterized in that: The second pump body is provided with an air hole, and the air hole is communicated with the second sub-cavity.

7. A ferrofluid displacement pump with a contact type one-way valve according to claim 5, characterized in that: Also includes: A driving assembly is installed on one side of the pump body, and the driving assembly is used to drive the piston to move along the first pump body.

8. A ferrofluid displacement pump with a contact type one-way valve according to claim 7, characterized in that: The drive assembly comprises: A guide rail, mounted on one side of the second pump body; A carrier, slidably mounted on the guide rail, wherein a permanent magnet for driving the ferrofluid piston to move is disposed on the carrier; A lead screw is rotatably mounted on the carrier and is drivingly connected to the permanent magnet. The lead screw rotates to drive the carrier to move along the axial direction of the lead screw, and the axial direction of the lead screw is parallel to the axial direction of the second pump body. A driving motor is connected to the lead screw to drive the lead screw to rotate.

9. A ferromagnetic fluid displacement pump with a contact type one-way valve according to claim 8, characterized in that: Guide grooves are arranged on both sides of the guide rail, and the carrier is slidably installed in the guide grooves.

10. A ferromagnetic fluid displacement pump with a contact type one-way valve according to claim 9, characterized in that: The drive assembly also includes: A pulley is rotatably mounted on the carrier, and the pulley is located in the guide groove.

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