Liquid delivery device

Abstract

A liquid delivery device, comprising a main body, and a liquid intake flow channel and a liquid output flow channel, which are arranged on the main body, wherein each of the liquid intake flow channel and the liquid output flow channel is in communication with a diaphragm cavity by means of a first one-way valve; a diaphragm and a driving mechanism for enabling the diaphragm to move to change the volume of the diaphragm cavity are provided on one side of the diaphragm cavity; the driving mechanism comprises a push-pull rod and a driving assembly used for driving the push-pull rod to move in a reciprocating manner; a connecting head is provided at one end of the push-pull rod, and a connecting portion connected to the diaphragm is provided in the middle of the connecting head; the connecting head is provided with a diaphragm pushing portion at the periphery of the connecting portion, and the face of the diaphragm pushing portion facing the diaphragm is an annular arc face recessed in the middle; and the main body is provided with an oil cavity between the diaphragm and the push-pull rod, and an oil supplementing mechanism is connected to the oil cavity.

Description

Liquid conveying device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on and claims priority to a Chinese patent application with an application date of "December 13, 2023", application number "202311719079.9", and invention name "A liquid delivery device". The full text of the Chinese patent application is hereby cited in this application as a part of this application. Technical Field

[0003] The present invention relates to the technical field of liquid conveying equipment, and in particular to a liquid conveying device. Background Art

[0004] An existing infusion device includes a manifold, a diaphragm, and a drive mechanism. The manifold is provided with an inlet channel, an outlet channel, an inlet communicating with the inlet channel, and an outlet communicating with the outlet channel. The inlet channel and the outlet channel are each connected to at least two diaphragm cavities via a one-way valve. A diaphragm is provided on one side of each diaphragm cavity, and the drive mechanism is used to actuate the diaphragm to change the volume of the diaphragm cavity. The existing infusion device has the following shortcomings: 1) The drive mechanism abuts against the diaphragm surface during the process of pushing the diaphragm, which can easily damage the diaphragm and shorten its service life; 2) The portion of the diaphragm connected to the drive mechanism is primarily subjected to force, resulting in uneven overall force, easy damage, and a short service life. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a liquid conveying device which has a simple structure, reduces damage to the diaphragm and can increase the service life of the diaphragm.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A liquid conveying device includes a main body and a liquid inlet channel and a liquid outlet channel provided on the main body, the liquid inlet channel and the liquid outlet channel are connected to a diaphragm cavity through a first one-way valve, a diaphragm and a driving mechanism for moving the diaphragm to change the volume of the diaphragm cavity are provided on one side of the diaphragm cavity, the driving mechanism includes a push-pull rod and a driving assembly for driving the push-pull rod to move back and forth, a connecting head is provided at one end of the push-pull rod, a connecting portion connected to the diaphragm is provided in the middle of the connecting head, a film pushing portion is provided on the outer periphery of the connecting portion of the connecting head, and the side of the film pushing portion facing the diaphragm is an annular arc surface with a concave middle portion, and an oil chamber is provided in the main body between the diaphragm and the push-pull rod, and the oil chamber is connected to an oil replenishing mechanism.

[0008] As a further improvement of the above technical solution:

[0009] The connecting head is detachably connected to the push-pull rod.

[0010] The push-pull rod is in sliding cooperation with the main body.

[0011] The driving assembly includes a pressure plate and a rotary drive. The pressure plate is pressed on each push-pull rod, and the rotary drive is arranged on the main body to drive the pressure plate to swing around the center.

[0012] A matching surface which can match the annular arc surface is provided on a side of the membrane cavity corresponding to the annular arc surface.

[0013] The oil replenishing mechanism includes an oil storage chamber and a second one-way valve, and the oil chamber is connected to the oil storage chamber through the second one-way valve.

[0014] The second one-way valve includes a valve cavity provided in the main body and connected to the oil cavity, and a valve core and an elastic member provided in the valve cavity. A valve body is provided on one side of the valve cavity, and a valve port connected to the oil storage chamber is provided on the valve body. The elastic member is provided between the valve core and the main body, and is used to seal the valve core at the valve port.

[0015] The valve port is a bell-shaped port with a small outside and a large inside, and the valve core is spherical.

[0016] The main body is provided with an oil passage, the valve cavity is communicated with the oil cavity through the oil passage, and the valve body is threadedly connected to the main body.

[0017] The oil storage chamber is arranged in the main body and placed above the oil cavity.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] In the liquid delivery device of the present invention, when in operation, the drive assembly drives the push-pull rod to reciprocate, thereby driving the diaphragm to reciprocate, and in conjunction with the action of the first one-way valve, the liquid is sucked from the liquid inlet channel into the diaphragm cavity and discharged to the liquid outlet channel. On the one hand, in the process of pushing the diaphragm to move, the push-pull rod contacts the diaphragm through the annular arc surface, thereby reducing damage to the diaphragm. On the other hand, the main body is provided with an oil chamber between the diaphragm and the push-pull rod. When in use, the oil chamber is filled with oil, and the oil squeezes the diaphragm, so that the overall force on the diaphragm is relatively uniform, thereby improving the service life. In addition, during the reciprocating motion of the push-pull rod, the volume of the oil chamber can be kept consistent, so that the diaphragm always operates in a stable environment, further improving the service life of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the internal structure of the liquid delivery device of the present invention.

[0021] FIG2 is a second schematic diagram of the internal structure of the liquid delivery device of the present invention.

[0022] FIG3 is an enlarged view of point A in FIG2 .

[0023] The numbers in the figure represent:

[0024] 1. Main body; 11. Oil channel; 2. Liquid inlet channel; 3. Liquid outlet channel; 4. First one-way valve; 5. Diaphragm cavity; 51. Matching surface; 6. Diaphragm; 7. Driving mechanism; 71. Push-pull rod; 711. Connecting head; 712. Connecting part; 713. Diaphragm pushing part; 714. Annular arc surface; 72. Driving assembly; 721. Pressure plate; 722. Rotary drive; 8. Oil chamber; 9. Oil replenishing mechanism; 91. Valve cavity; 92. Valve core; 93. Elastic member; 94. Valve body; 95. Valve port; 96. Oil storage chamber. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", etc., 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 describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] Furthermore, 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 identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0028] In the present invention, unless otherwise expressly specified or limited, the term "connection" and other terms should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Figures 1 to 3 show an embodiment of a liquid conveying device of the present invention. The liquid conveying device of this embodiment includes a main body 1 and a liquid inlet channel 2 and a liquid outlet channel 3 provided on the main body 1. The liquid inlet channel 2 and the liquid outlet channel 3 are connected to a diaphragm cavity 5 through a first one-way valve 4. A diaphragm 6 and a driving mechanism 7 for moving the diaphragm 6 to change the volume of the diaphragm cavity 5 are provided on one side of the diaphragm cavity 5. The driving mechanism 7 includes a push-pull rod 71 and a driving assembly 72 for driving the push-pull rod 71 to reciprocate. A connecting head 711 is provided at one end of the push-pull rod 71. A connecting part 712 connected to the diaphragm 6 is provided in the middle of the connecting head 711. A film pushing part 713 is provided on the outer periphery of the connecting part 712. The film pushing part 713 has a side facing the diaphragm 6 with a centrally recessed annular arc surface 714. The main body 1 is provided with an oil chamber 8 between the diaphragm 6 and the push-pull rod 71. The oil chamber 8 is connected to an oil replenishing mechanism 9.

[0030] During operation, the driving assembly 72 drives the push-pull rod 71 to reciprocate, driving the diaphragm 6 to reciprocate, cooperating with the first one-way valve 4 to allow liquid to be sucked into the membrane cavity 5 from the liquid inlet channel 2 and discharged to the liquid outlet channel 3.

[0031] On the one hand, in the process of pushing the diaphragm 6 to move, the push-pull rod 71 abuts against the diaphragm 6 through the annular arc surface 714, reducing damage to the diaphragm 6; on the other hand, the main body 1 is provided with an oil chamber 8 between the diaphragm 6 and the push-pull rod 71. When in use, the oil chamber 8 is filled with oil, and the diaphragm 6 is squeezed by the oil, so that the overall force of the diaphragm 6 is relatively uniform, thereby improving the service life. Moreover, in the reciprocating motion of the push-pull rod 71, the volume of the oil chamber 8 can be kept consistent, so that the diaphragm 6 always operates in a stable environment, further improving the service life of the diaphragm 6.

[0032] Furthermore, in this embodiment, the push-pull rod 71 is slidably engaged with the main body 1 , so that the push-pull rod 71 can move back and forth (up and down in this embodiment) smoothly.

[0033] Furthermore, in this embodiment, as shown in FIG1 , the drive assembly 72 includes a pressure plate 721 and a rotary drive 722 . The pressure plate 721 is pressed against each push-pull rod 71 , and the rotary drive 722 is mounted on the main body 1 and is used to drive the pressure plate 721 to oscillate around the center. The rotary drive 722 drives the pressure plate 721 to oscillate around the center (oscillation only, not rotation), driving the diaphragm 6 to reciprocate, thereby achieving the pumping and draining action of the diaphragm chamber 5 .

[0034] Furthermore, in this embodiment, a matching surface 51 is provided on a surface of the diaphragm cavity 5 corresponding to the annular arc surface 714, which is adapted to the annular arc surface 714. Thus, when the diaphragm 6 is pushed against the matching surface 51 by the annular arc surface 714, the matching surface 51 and the annular arc surface 714 can reduce the degree of damage to the diaphragm 6 caused by compression, thereby increasing the service life of the diaphragm 6.

[0035] Furthermore, in this embodiment, as shown in Figure 2, the oil replenishment mechanism 9 includes an oil reservoir chamber 96 and a second one-way valve. The oil chamber 8 is connected to the oil reservoir chamber 96 via the second one-way valve. The oil replenishment mechanism 9 replenishes oil in the oil chamber 8, maintaining a full oil state. The second one-way valve allows oil in the oil reservoir chamber 96 to flow into the oil chamber 8, while preventing oil in the oil chamber 8 from flowing into the oil reservoir chamber 96.

[0036] Furthermore, in this embodiment, as shown in FIG3 , the second one-way valve includes a valve cavity 91 disposed within the main body 1 and communicating with the oil chamber 8, a valve core 92 disposed within the valve cavity 91, and an elastic member 93. A valve body 94 is disposed on one side of the valve cavity 91. The valve body 94 is provided with a valve port 95 communicating with an oil storage chamber 96. The elastic member 93 is disposed between the valve core 92 and the main body 1 and is used to seal the valve core 92 against the valve port 95. When the oil chamber 8 is low on oil, the oil in the oil storage chamber 96 overcomes the elastic member 93 through the valve port 95, pushes the valve core 92 open, enters the valve cavity 91, and then flows into the oil chamber 8. In the reverse direction, the valve core 92 is kept sealed against the valve port 95 by the elastic force of the elastic member 93.

[0037] Furthermore, in this embodiment, the valve port 95 is a bell-shaped port that is small on the outside and large on the inside, and the valve core 92 is spherical.

[0038] Furthermore, in this embodiment, an oil passage 11 is provided on the main body 1 , the valve cavity 91 is communicated with the oil cavity 8 via the oil passage 11 , and the valve body 94 is threadedly connected to the main body 1 for easy replacement.

[0039] Furthermore, in this embodiment, the oil storage chamber 96 is provided in the main body 1 and is placed above the oil chamber 8. The annular arc surface 714 is in the shape of a hollow ring and has an arc-shaped cross section.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A liquid delivery device, comprising a main body (1), a liquid inlet channel (2) and a liquid outlet channel (3) provided on the main body (1), wherein the liquid inlet channel (2) and the liquid outlet channel (3) are connected to a membrane chamber (5) through a first one-way valve (4), and a diaphragm (6) and a driving mechanism (7) for actuating the diaphragm (6) to change the volume of the membrane chamber (5) are provided on one side of the membrane chamber (5), and it is characterized in that: The driving mechanism (7) includes a push-pull rod (71) and a driving component (72) for driving the push-pull rod (71) to reciprocate. One end of the push-pull rod (71) is provided with a connecting head (711). The middle of the connecting head (711) is provided with a connecting portion (712) connected to the diaphragm (6). The connecting head (711) is provided with a diaphragm-pushing portion (713) on the outer periphery of the connecting portion (712). The surface of the diaphragm-pushing portion (713) facing the diaphragm (6) is an annular arc surface (714) sunken in the middle. An oil cavity (8) is provided between the diaphragm (6) and the push-pull rod (71) in the main body (1). The oil cavity (8) is connected with an oil replenishing mechanism (9).

2. The liquid delivery device according to claim 1, characterized in that: The connecting head (711) is detachably connected to the push-pull rod (71).

3. The liquid delivery device according to claim 1, characterized in that: The push-pull rod (71) is slidably matched with the main body (1).

4. The liquid delivery device according to claim 1, characterized in that: The driving component (72) includes a pressure plate (721) and a rotary drive (722). The pressure plate (721) is pressed on each push-pull rod (71). The rotary drive (722) is arranged on the main body (1) for driving the pressure plate (721) to swing up and down around the center.

5. The liquid delivery device according to claim 1, characterized in that: An adapting surface (51) capable of adapting to the annular arc surface (714) is provided on the surface of the membrane cavity (5) corresponding to the annular arc surface (714).

6. The liquid delivery device according to any one of claims 1 to 5, characterized in that: The oil replenishing mechanism (9) includes an oil storage chamber (96) and a second one-way valve. The oil cavity (8) is connected to the oil storage chamber (96) through the second one-way valve.

7. The liquid delivery device according to claim 6, characterized in that: The second one-way valve includes a valve cavity (91) arranged in the main body (1) and communicated with the oil cavity (8), a valve core (92) and an elastic member (93) arranged in the valve cavity (91). A valve body (94) is arranged on one side of the valve cavity (91). A valve port (95) communicated with the oil storage chamber (96) is arranged on the valve body (94). The elastic member (93) is arranged between the valve core (92) and the main body (1) for blocking the valve port (95) with the valve core (92).

8. The liquid delivery device according to claim 7, characterized in that: The valve port (95) is a flared port with a smaller outer diameter and a larger inner diameter. The valve core (92) is spherical.

9. The liquid delivery device according to claim 6, characterized in that: An oil passage (11) is arranged on the main body (1). The valve cavity (91) is communicated with the oil cavity (8) through the oil passage (11). The valve body (94) is threadedly connected to the main body (1).

10. The liquid delivery device according to claim 6, characterized in that: The oil storage chamber (96) is arranged in the main body (1) and above the oil cavity (8).

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