A liquid injection pump

Abstract

The present invention discloses an infusion pump, comprising a first pump body, one end of which is connected to an infusion end, and the other end of which is connected to a driving end, wherein the infusion end and the driving end are connected via a universal connector, wherein the universal connector is universally connected to the infusion end and the driving end, respectively, and the ends of the infusion end and the driving end connected to the universal connector are both located within the first pump body. The infusion pump of the present invention is provided with a universal connector universally connected to the infusion end and the driving end on both sides, effectively solving the problems of high pump core loss rate and easy jamming and unusability of conventional infusion pumps during use, and having advantages such as no jamming of the driving end and the infusion pump, and high efficiency of use.

Description

Technical Field

[0001] This invention relates to the field of pump technology, specifically to a liquid injection pump. Background Technology

[0002] Existing plunger injection pumps mainly consist of a pump body, an injection end, and a drive end. The drive end directly drives the injection end to complete the injection action. For example, publication number CN 103967733 A, entitled "A Precision Metering Ceramic Plunger Injection Pump," describes a structure including a pump head, two one-way valves, a pump body, a drive mechanism, and a control drive unit. The one-way valves are connected to threaded holes in the pump head via threads on the upper valve seat and lower valve cover. The pump head is secured to the drive housing via hexagonal bolts passing through four through holes. The motor mount is secured to the drive housing via hexagonal bolts passing through four through holes, and the drive motor is secured to the motor mount via hexagonal bolts passing through four through holes. One end of the plunger core in the pump body is connected to the internal thread of the floating joint in the drive mechanism via an external thread. The drive mechanism is connected to the control drive unit. This injection pump is corrosion-resistant and wear-resistant. Because the ceramic does not allow impurities to enter, it ensures that the liquid is not contaminated during injection. Furthermore, the ceramic surface has a very low roughness, making it easy to clean online; thus, it improves accuracy and speed. Because the injection end and drive end are close to the inner wall of the pump body, friction between them and the inner wall of the pump body is likely to occur during operation due to the machining precision required. In severe cases, this may cause jamming and lead to malfunction and shutdown. Summary of the Invention

[0003] This invention provides a liquid injection pump with low friction and smooth operation.

[0004] To achieve the above objectives, the following technical solutions are employed.

[0005] A liquid injection pump includes a first pump body, one end of which is connected to an injection end and the other end of which is connected to a drive end. The injection end and the drive end are connected by a universal connector, which is universally connected to both the injection end and the drive end. The ends of the injection end and the drive end connected to the universal connector are both located within the first pump body.

[0006] Furthermore, the universal connector includes a universal body, with a fixing member passing through each end of the universal body. A ball is provided between the universal body and the fixing member, and the ball is fixed on the fixing member. The universal body and the ball are connected in contact.

[0007] Furthermore, the two ends of the universal joint body are hemispherical in shape, and the two ends of the universal joint body are respectively connected to the injection end and the drive end in contact.

[0008] Furthermore, the injection end includes a pump core, which is a convex columnar structure laid down. A tensioning component is fitted on the protruding end of the pump core, and the tensioning component is universally connected to a universal connector.

[0009] Furthermore, the tensioning assembly consists of a first tensioning sleeve and a second tensioning sleeve, wherein the first tensioning sleeve is fitted outside the protrusion and the second tensioning sleeve is fitted outside the first tensioning sleeve.

[0010] Furthermore, the first tension sleeve has a stepped structure on the outside, and the outer side of the stepped protruding end of the tension sleeve is set as an inclined surface. The shape of the end of the second tension sleeve connected to the first tension sleeve matches that of the first tension sleeve. The outer end of the second tension sleeve is in contact with the universal body for universal connection.

[0011] Furthermore, an injection chamber is provided on the other end of the pump core. The injection chamber is sealed to the first pump body through a sealing assembly. The sealing assembly is sleeved on the outside of the pump core. An injection cavity is formed between the injection chamber and the pump core. An injection hole is provided on one side of the injection chamber.

[0012] Furthermore, the sealing assembly includes a first sealing ring and a second sealing ring. The first sealing ring has a stepped structure. The two sides of the stepped bottom plate of the first sealing ring are respectively sealed to the injection chamber and the pump core. The extended end of the first sealing ring and the two sides of the second sealing ring are respectively sealed to the first pump body and the pump core.

[0013] Furthermore, the drive end includes a motor and a lead screw connected to the motor. The lead screw is provided with a lead screw seat that moves along the lead screw. The lead screw seat is connected to the lead screw connecting sleeve. The end of the lead screw connecting sleeve is in contact with the universal body for universal joint connection.

[0014] Furthermore, the first pump body is connected to a second pump body at one end with a drive end, a motor is installed at the outer end of the second pump body, and a directional sleeve is provided inside the second pump body, the directional sleeve being fitted between the lead screw connecting sleeve and the second pump body.

[0015] Compared with the prior art, the injection pump of the present invention has the following beneficial effects: By adding a universal connector between the injection end and the drive end, the two ends of the universal connector are universally connected to the injection end and the drive end respectively. During the operation of the pump, if the drive end and / or injection end deviates in machining accuracy or installation, it can automatically return to its original position in the first pump body, effectively avoiding friction between the drive end and / or injection end and the inner wall of the first pump body. The friction is reduced and there is no jamming or shutdown failure, effectively solving the problems of high friction and easy shutdown failure during operation in the prior art. Attached Figure Description

[0016] Appendix Figure 1This is a perspective view of the injection pump of the present invention;

[0017] Appendix Figure 2 This is a cross-sectional view of the injection pump of the present invention;

[0018] Appendix Figure 3 For the appendix Figure 2 Overall 3D view of the universal connector;

[0019] Appendix Figure 4 For the appendix Figure 2 Partial 3D view of the universal connector. Detailed Implementation

[0020] The injection pump of the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0021] Reference Figure 1 and Figure 2 According to a non-limiting embodiment of the present invention, an injection pump, specifically a plunger-type injection pump, includes a first pump body 100. One end of the first pump body 100 is connected to an injection end 200, and the other end is connected to a drive end 300. The injection end 200 and the drive end 300 are connected via a universal connector 400. The universal connector 400 is universally connected to both the injection end 200 and the drive end 300. The ends of the injection end 200 and the drive end 300 connected to the universal connector 400 are both located within the first pump body 100. This invention adds a universal connector 400 between the injection end 200 and the drive end 300, so that both ends of the universal connector 400 are universally connected to the injection end 200 and the drive end 300 respectively. During the operation of the pump, if the drive end 300 and / or the injection end 200 deviate in machining accuracy or installation, they can automatically return to their original position within the first pump body 100. This effectively avoids friction between the drive end 300 and / or the injection end 200 and the inner wall of the first pump body 100, and eliminates the problem of jamming and shutdown. This effectively solves the problems of high friction and easy shutdown during operation in the prior art.

[0022] Reference Figure 2 , Figure 3 and Figure 4In a non-limiting embodiment of the present invention, the universal connector 400 includes a universal body 410, with each end of the universal body 410 passing through a fixing member 420. A ball 430 is provided between the universal body 410 and the fixing member 420, and the ball 430 is fixed to the fixing member 420. The universal body 410 is in contact with the ball 430. For example, the fixing member 420 can be a rigid fixing post made of a rigid material or an elastic fixing post made of an elastic material. Each end of the fixing post is fixed to the inner wall of the first pump body 100. A ball 430 passing through the fixing post is installed on each fixing post. The universal body 410 has through holes larger than the fixing post at both ends. The size of the through holes is adapted to the size of the ball 430. After passing through the fixing post, the universal body 410 is in contact with the ball 430 at the through holes.

[0023] Reference Figure 2 , Figure 3 and Figure 4 In a non-limiting embodiment of the present invention, the two ends of the universal body 410 are hemispherical 430. The two ends of the universal body 410 are respectively connected in contact with the injection end 200 and the drive end 300. In specific implementation, the center of the hemispherical 430 at both ends of the universal body 410 is concentric with the center of the ball 430 on the fixing member 420 that is connected in contact with the ball. This effectively ensures that the universal body 410 moves in the universal direction along the ball 430, further ensuring that the injection pump operates smoothly and with low friction during use, effectively increasing the service life of the drive end 300 and the injection end 200, and thus effectively improving the service life of the entire injection pump.

[0024] Reference Figure 2 In a non-limiting embodiment of the present invention, the injection end 200 includes a pump core 210, which has a convex, downward-facing columnar structure. A tensioning component 220 is fitted onto the protruding end of the pump core 210, and the tensioning component 220 is universally connected to a universal connector 400. In this embodiment, the tensioning component 220 is made of a flexible soft material or an elastic material. Fitting the tensioning component 220 onto the pump core 210 provides tension, securing the pump core 210 securely within the tensioning component 220. Furthermore, it forms a protective sleeve between the end of the pump core 210 and the first pump body 100, effectively preventing direct collision or contact between the pump core 210 and the first pump body 100 during operation, thus reducing friction between them and significantly extending the service life of the pump core 210.

[0025] Reference Figure 2In a non-limiting embodiment of the present invention, the tensioning assembly 220 consists of a first tensioning sleeve 221 and a second tensioning sleeve 222. The first tensioning sleeve 221 is sleeved outside the protrusion of the pump core 210, and the second tensioning sleeve 222 is sleeved outside the first tensioning sleeve 221. The tensioning assembly 220, composed of the mutually sleeved first tensioning sleeve 221 and the second tensioning sleeve 222, forms a secondary tension force on the pump core 210, effectively improving the overall tension and fixation effect, further ensuring smooth liquid injection without jamming.

[0026] Reference Figure 2 In a non-limiting embodiment of the present invention, the first tension sleeve 221 has a stepped structure on the outside, and the outer side of the stepped protruding end of the first tension sleeve 221 is set as an inclined surface. The shape of the end of the second tension sleeve 222 connected to the first tension sleeve 221 matches the shape of the first tension sleeve 221. The outer end of the second tension sleeve 222 is in contact universal connection with the universal body 410. In this embodiment, the first tension sleeve 221 has a stepped structure on the outside, and the second tension sleeve 222 is fitted on the first tension sleeve 221. That is, the first tension sleeve 221 is provided with a sloping groove for accommodating the stepped protruding end of the first tension sleeve 221. After the second tension sleeve 222 is fitted on the first tension sleeve 221, the first tension sleeve 221 and the second tension sleeve 222 interact with each other to form a secondary tensioning effect on the pump core 210. At the same time, the contact surface of the first tension sleeve 221 and the second tension sleeve 222 is an inclined surface, which effectively increases the interaction force between the two, so that the second tension sleeve 222 is firmly fitted on the first tension sleeve 221.

[0027] Reference Figure 1 and Figure 2 In a non-limiting embodiment of the present invention, an injection chamber 230 is externally sleeved at the other end of the pump core 210. The injection chamber 230 is sealed to the first pump body 100 via a sealing assembly 240. The sealing assembly 240 is sleeved on the outside of the pump core 210, forming an injection cavity 231 between the injection chamber 230 and the pump core 210. An injection hole 232 is provided on one side of the injection chamber 230. The injection chamber 230 is connected to the first pump body 100 by the sealing assembly 240, and the sealing assembly 240 is sleeved on the pump core 210, effectively ensuring the sealing performance within the injection cavity 231, further ensuring smooth injection process and improving injection efficiency.

[0028] Reference Figure 1 and Figure 2In a non-limiting embodiment of the present invention, the sealing assembly 240 includes a first sealing ring 241 and a second sealing ring 242. The first sealing ring 241 has a stepped structure. The two sides of the stepped bottom plate of the first sealing ring 241 are respectively sealed to the injection chamber 230 and the pump core 210. The protruding end of the first sealing ring 241 and the two sides of the second sealing ring 242 are respectively sealed to the first pump body 100 and the pump core 210. The first sealing ring 241 with a stepped structure has its stepped bottom plate used to seal the injection chamber 230, and the stepped protruding part and the second sealing ring 242 used to seal the first pump body 100. It has a good sealing effect, effectively ensuring the sealing performance in the injection cavity 231, further ensuring the smooth progress of the injection process, and improving the injection efficiency.

[0029] Reference Figure 1 and Figure 2 In a non-limiting embodiment of the present invention, the drive end 300 includes a motor 310 and a lead screw 320 connected to the motor 310. The lead screw 320 is provided with a lead screw seat 340 that moves along the lead screw 320. The lead screw seat 340 is connected to a lead screw connecting sleeve 330. The end of the lead screw connecting sleeve 330 is in contact with the universal body 410 for universal connection. The lead screw 320 is mounted on the motor 310. When the motor 310 starts, it drives the lead screw 320 to rotate. The lead screw seat 340 on the lead screw 320 moves along the lead screw 320. The lead screw seat 340 then drives the lead screw connecting sleeve 330 connected to it to move together. The lead screw connecting sleeve 330 is in contact with the universal body 410 for universal connection. During operation, on the one hand, the lead screw connecting sleeve 330 can be freely adjusted. On the other hand, when the motor 310 starts, after passing through the lead screw 320, the lead screw seat 340 and the lead screw connecting sleeve 330, the liquid injection end 200 is driven to move within the first pump body 100 through the universal connector 400 to realize liquid injection.

[0030] Reference Figure 1 and Figure 2 In a non-limiting embodiment of the present invention, one end of the first pump body 100, which is equipped with a drive end 300, is connected to a second pump body 500. A motor 310 is installed at the outer end of the second pump body 500. A directional sleeve 350 is provided inside the second pump body 500, and the directional sleeve is fitted between the lead screw connecting sleeve 330 and the second pump body 500. The second pump body 500 is provided to fix and install the motor 310, so that the drive end 300 is located inside the second pump body 500, and to protect the lead screw connecting sleeve 330 in the drive end 300. The directional sleeve between the lead screw connecting sleeve 330 and the second pump body 500 is further used to protect the lead screw connecting sleeve 330, extend the service life of the lead screw connecting sleeve 330, and thus extend the service life of the entire injection pump.

[0031] This invention adds a universal connector 400 between the injection end 200 and the drive end 300, so that both ends of the universal connector 400 are universally connected to the injection end 200 and the drive end 300 respectively. During the operation of the pump, if the drive end 300 and / or the injection end 200 deviate in machining accuracy or installation, they can automatically return to their original position within the first pump body 100. This effectively avoids friction between the drive end 300 and / or the injection end 200 and the inner wall of the first pump body 100, and eliminates the problem of jamming and shutdown. This effectively solves the problems of high friction and easy shutdown during operation in the prior art.

[0032] In the description of this invention, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The above embodiments are merely specific examples of the present invention, and their descriptions are quite specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these obvious substitutions all fall within the protection scope of the present invention.

Claims

1. A liquid injection pump, comprising a first pump body, wherein one end of the first pump body is connected to an injection end and the other end is connected to a drive end, characterized in that: The injection end and the drive end are connected via a universal connector, which is universally connected to both the injection end and the drive end. The ends of both the injection end and the drive end connected to the universal connector are located within the first pump body. During pump operation, if the drive end and / or the injection end deviates from its machining accuracy or installation specifications, it can automatically return to its original position within the first pump body. The universal connector includes a universal body, with a fixed post passing through each of the two ends of the universal body. A ball is provided between the universal body and the fixed post, and the ball is fixed on the fixed post. The universal body is in contact with the ball. The two ends of the universal body are hemispherical in shape and are in contact with the liquid injection end and the drive end, respectively. The injection end includes a pump core, which is a convex column structure laid down, and a tensioning component is fitted on the protruding part of the pump core. The tensioning component is made of a flexible soft material or elastic material, and its outer end extends out of the end of the protrusion and is connected in contact with one end of the universal body. One end of the universal joint body does not contact the protruding end of the pump core.

2. The injection pump according to claim 1, characterized in that, The fixing posts of the universal connector are arranged in parallel.

3. The injection pump according to claim 1, characterized in that, The tensioning assembly consists of a first tensioning sleeve and a second tensioning sleeve. The first tensioning sleeve is fitted outside the protrusion, and the second tensioning sleeve is fitted outside the first tensioning sleeve. The first tensioning sleeve does not extend beyond the end of the protrusion, and the outer end of the second tensioning sleeve extends beyond the end of the protrusion.

4. The injection pump according to claim 3, characterized in that, The first tension sleeve has a stepped structure on the outside, and the outer side of the stepped protruding end of the first tension sleeve is set with an inclined surface; one end of the second tension sleeve is sleeved on the outer side of the stepped protruding end, and the shape of its inner circumference matches the inclined surface of the outer side of the stepped protruding end of the first tension sleeve; the outer end of the second tension sleeve is connected to the universal body in a universal contact manner.

5. The injection pump according to claim 1, characterized in that, The other end of the pump core is fitted with an injection chamber, which is sealed to the first pump body through a sealing assembly. The sealing assembly is fitted outside the pump core, and an injection cavity is formed between the injection chamber and the pump core. An injection hole is provided on one side of the injection chamber.

6. The injection pump according to claim 5, characterized in that, The sealing assembly includes a first sealing ring and a second sealing ring. The first sealing ring has a stepped structure. The two sides of the stepped bottom plate of the first sealing ring are respectively sealed to the injection chamber and the pump core. The extended end of the first sealing ring and the two sides of the second sealing ring are respectively sealed to the first pump body and the pump core.

7. The injection pump according to claim 1, characterized in that, The drive end includes a motor and a lead screw connected to the motor. The lead screw is provided with a lead screw seat that moves along the lead screw. The lead screw seat is connected to the lead screw connecting sleeve. The end of the lead screw connecting sleeve is in contact with the universal body for universal joint connection.

8. The injection pump according to claim 7, characterized in that, The first pump body has a drive end connected to a second pump body. A motor is installed at the outer end of the second pump body. A directional sleeve is provided inside the second pump body, and the directional sleeve is fitted between the lead screw connecting sleeve and the second pump body.

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