Liquid Pump

Abstract

A liquid pump is provided. [Solution] A liquid pump comprising at least a pump body (4) and a valve seat (7), wherein the valve seat (7) is attached to the lower end of the pump body (4), which is an entire component integrally molded from the same material, the pump body (4) comprising a shell (41) with a hollow pump cavity and an elastic valve plate (42) attached to the bottom end of the shell (41), the elastic valve plate (42) having a valve channel, the valve seat (7) fitted and installed below the elastic valve plate (42), the valve seat (7) comprising a valve body (71) with a liquid flow channel, the upper part of the valve body (71) having a sealing structure for sealingly mating with the elastic valve plate (42). The overall number of parts in the liquid pump is small, saving production costs, making product assembly more convenient and increasing product durability. At the same time, each part of the liquid pump is basically made of recyclable plastic and can be fully recycled.

Description

[Technical field]

[0001] The present invention relates to the field of cosmetic packaging containers, and in particular to liquid pumps. [Background technology]

[0002] Liquid pumps are widely used in the field of cosmetics and are convenient for people's daily life. They are mainly used to pump liquid in daily washing and skin care products such as hand gel, shower gel, shampoo, face milk, moisturizing solution, etc. Existing liquid pumps have various structural forms, and usually have pump body, piston rod, piston, head hat connecting rod, spring and other parts. When liquid is needed, press the head hat connecting rod, the piston rod will move downward, and the liquid pre-stored in the pump body can be pumped. After the liquid is pumped, release the hand, under the elastic effect of the spring, the piston rod will move upward, making the liquid sealed inside the pump body again, which is very convenient to use.

[0003] There are still many problems with prior art liquid pumps, including: 1. In the current pump core, glass beads and steel beads are mostly used in the lower valve, and the lower valve and the pump shell need to be separately injection molded and then assembled, which not only leads to a complicated structure and low assembly efficiency, but also requires a variety of production materials, resulting in high production costs, and also causing the problem that the pump core product as a whole cannot be recycled. 2. The piston is prone to cracking at the bottom after long term service. 3. The head hat connecting rod is made of PP (polypropylene) material, and the piston head is made of POM (polyaldehyde resin) material, which can achieve the effect of preventing the head hat connecting rod from loosening and falling off during cooperation between the head hat connecting rod and the piston head; however, the POM material is not conducive to environmental protection recycling. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT The present invention seeks to provide a liquid pump of novel design which overcomes one or more of the problems of the prior art.

[0005] In order to achieve the above object, the technical solution used by the present invention is as follows: A liquid pump, comprising at least a pump body and a valve seat, the valve seat is attached to the lower end of the pump body, the pump body is a whole part integrally molded by the same material, the pump body comprises a shell with a hollow pump cavity and an elastic valve plate installed at the bottom end of the shell, the elastic valve plate has a valve channel, the valve seat is fitted and installed under the elastic valve plate, the valve seat comprises a valve body with a liquid flow channel, and a seal structure is installed at the top of the valve body to seal and mate with the elastic valve plate.

[0006] Preferably, the resilient valve plate includes a valve plate, a resilient strip connected between the valve plate and the inner peripheral wall of the shell, and a plurality of gaps between the resilient strip and the valve plate and between the resilient strip and the inner peripheral wall of the shell, all of the gaps together defining the valve channel. [Means for solving the problem]

[0007] In a specific embodiment, the valve plate is disc-shaped, the elastic strip includes an arc-shaped extension, and a first connecting portion and a second connecting portion respectively installed at both ends of the arc-shaped extension, the extension trajectory of the arc-shaped extension is a part of a circular arc with the center of the valve plate as the center of rotation, the first connecting portion extends radially inward of the arc-shaped extension and is connected to the valve plate, and the second connecting portion extends radially outward of the arc-shaped extension and is connected to the shell.

[0008] In a specific embodiment, the elastic strip is a plurality of strips, and all of the elastic strips are spaced apart from each other in the circumferential direction on the outer circumferential side of the valve plate.

[0009] In a specific embodiment, the sealing structure is an annular boss or a flat surface installed on the upper portion of the valve body, and the upper end surface of the annular boss or the flat surface fits into contact with the bottom end surface of the valve plate.

[0010] In a specific embodiment, the elastic valve plate has an open state and a closed state. When the elastic valve plate is in the open state, the valve plate elastically moves upward, the valve plate disengages from the sealing structure, and the valve channel communicates with the liquid flow channel; when the elastic valve plate is in the closed state, the valve plate resets and seals between the valve plate and the sealing structure, and the valve channel does not communicate with the liquid flow channel.

[0011] Preferably, the valve seat is removably engaged and secured to a lower portion of the shell and below the elastomeric valve plate.

[0012] Preferably, both the valve seat and the pump body are moulded from recyclable plastic.

[0013] Preferably, the liquid pump also includes a piston rod, a piston, a connecting rod and a lock cover, the lock cover is fixedly installed on the upper end of the pump body and slidingly fitted between the connecting rod and the lock cover, the piston rod is fixedly connected to the connecting rod, the piston is fitted to slidingly fit with the piston rod, and the piston is slidably installed in the pump body and sealedly connected between the pump body.

[0014] Furthermore, the connecting rod has a mounting hole extending along the axial direction, the piston rod is inserted into the mounting hole along the axial direction, and a clamp structure is provided between the outer periphery of the piston rod and the inner periphery of the mounting hole, which engage with each other.

[0015] In a specific embodiment, the clamping structure includes an annular positioning protrusion disposed on an inner peripheral wall of the mounting hole and a positioning groove disposed on an outer peripheral portion of the piston rod, the annular positioning protrusion being fitted into the positioning groove, the locking structure includes a plurality of annular engagement grooves disposed at intervals in the axial direction on the inner peripheral wall of the mounting hole and a plurality of annular engagement bosses disposed at intervals in the axial direction on the outer peripheral portion of the piston rod, the annular positioning protrusion being located above all of the annular engagement grooves, the positioning groove being located above all of the annular engagement bosses, and all of the annular engagement bosses being fitted into and locked with correspondingly all of the annular engagement grooves.

[0016] In a specific embodiment, the connecting rod and the piston rod are all made of PP or PE material.

[0017] Furthermore, the piston rod includes a rod body that is fitted and connected to the connecting rod, and a piston head that is fixedly installed on the lower end of the rod body, and the piston includes an inner piston body that is slidingly fitted with the rod body, and an outer piston body that is slidingly fitted with the pump body, and an annular groove is formed between the piston head and the rod body, into which the lower end of the inner piston body can be fitted and inserted.

[0018] Furthermore, a through hole is drilled through the lock cover in the axial direction, and the connecting rod is inserted into the through hole so as to slide along the axial direction, the liquid pump is installed between the upper end of the lock cover and the upper end of the connecting rod, and also includes an elastic part that provides the acting force necessary for the upward movement of the connecting rod, and the lower end of the connecting rod has a limiting boss that protrudes outward and extends along the outer peripheral wall of the connecting rod, the outer diameter of the limiting boss is larger than the hole diameter of the through hole, and the limiting boss is located below the lock cover.

[0019] Further, the lock cover has an inner periphery having a plurality of ribs extending in the vertical direction, all of the ribs being spaced apart along the circumferential direction such that an air channel is formed between two adjacent ribs.

[0020] Furthermore, a plurality of pairs of engagement grooves and protrusions are fitted together between the outer periphery of the lock cover and the upper portion of the pump body, thereby engaging and fixing the lock cover to the upper portion of the pump body. Effect of the Invention

[0021] By applying the above technical solutions, the present invention has the following advantages over the prior art: 1. An elastic valve plate is integrated into the bottom of the pump body, and the elastic valve plate and the valve seat fit together to Valve seats It realizes the opening and closing of the pump body, and does not require the installation of glass beads, steel beads, and other parts, making the structure simpler and more convenient to install. Valve seat and It is molded as a single piece using environmentally friendly materials, making it easy to recycle. 2. The connection between the connecting rod and the piston rod is more stable and can be prevented from loosening and falling off. 3. When the piston rod and the piston work together, the piston will not crack and the durability of the piston is higher. 4. The protrusions of the pump body and the lock cover are small, eliminating the need to leave a large flange on the pump cover to cooperate. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram showing the overall structure of the liquid pump of the first embodiment, where the liquid pump is in an unpushed state. [Diagram 2] FIG. 1 is a schematic diagram showing the overall structure of the liquid pump of the first embodiment, where the liquid pump is in a pressed state. [Diagram 3] FIG. 1 is a schematic vertical cross-sectional view of the liquid pump of the first embodiment, where the liquid pump is in an unpushed state. [Figure 4] FIG. 1 is a schematic vertical cross-sectional view of the liquid pump of the first embodiment, where the liquid pump is in a pressed state. [Diagram 5] FIG. 2 is a schematic diagram showing the installation and connection between the liquid pump and the container cover of Example 1, where the liquid pump absorbs liquid from the bottle body. [Figure 6] FIG. 2 is a schematic diagram showing the installation and connection between the liquid pump and the container cover of the first embodiment, where the liquid pump pumps liquid to the outside. [Figure 7] FIG. 2 is a schematic three-dimensional view of a connecting rod of the liquid pump of the first embodiment. [Figure 8] FIG. 2 is a schematic vertical cross-sectional view of a connecting rod of the liquid pump of the first embodiment. [Figure 9] FIG. 2 is a schematic three-dimensional view of a spring of the liquid pump of the first embodiment. [Figure 10] FIG. 2 is a schematic three-dimensional view of a lock cover of the liquid pump of the first embodiment. [Figure 11] FIG. 2 is a schematic three-dimensional view of a pump body of the liquid pump of the first embodiment. [Figure 12] FIG. 2 is a schematic three-dimensional view of a pump body of the liquid pump of the first embodiment. [Figure 13] FIG. 2 is a schematic bottom view of the pump body of the liquid pump of the first embodiment. [Figure 14] FIG. 2 is a schematic three-dimensional view of a piston of the liquid pump of the first embodiment. [Figure 15] 2 is a schematic vertical cross-sectional view of a piston of the liquid pump of the first embodiment. FIG. [Figure 16]FIG. 2 is a schematic three-dimensional view of a piston rod of the liquid pump of the first embodiment. [Figure 17] FIG. 2 is a schematic vertical cross-sectional view of the piston rod of the first embodiment. [Figure 18] FIG. 2 is a schematic three-dimensional view of a valve seat of the liquid pump of the first embodiment. [Figure 19] FIG. 2 is a schematic vertical cross-sectional view of a valve seat of the liquid pump of the first embodiment. [Figure 20] FIG. 1 is a schematic diagram showing the overall structure of the liquid pump of Example 2, where the liquid pump is in an unpushed state. [Figure 21] FIG. 10 is a schematic diagram showing the overall structure of the liquid pump of Example 2, where the liquid pump is in a pressed state. [Figure 22] FIG. 11 is a schematic vertical cross-sectional view of the liquid pump of the second embodiment, where the liquid pump is in an unpushed state. [Figure 23] FIG. 11 is a schematic vertical cross-sectional view of the liquid pump of the second embodiment, where the liquid pump is in a pressed state. [Figure 24] FIG. 11 is a schematic diagram showing the installation and connection between the liquid pump and the container cover of Example 2, where the liquid pump absorbs liquid from the bottle body. [Diagram 25] FIG. 11 is a schematic diagram showing the installation and connection between the liquid pump and the container cover of Example 2, where the liquid pump pumps liquid to the outside. [Figure 26] FIG. 11 is a schematic three-dimensional view of a pump body of a liquid pump according to a second embodiment. [Figure 27] FIG. 11 is a schematic three-dimensional view of a valve seat of the liquid pump of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 The liquid pump shown in Figures 1 to 4 includes components such as a connecting rod 1, a spring 2, a lock cover 3, a pump body 4, a piston 5, a piston rod 6, and a valve seat 7, among which the valve seat 7 is attached to the lower end of the pump body 4, the lock cover 3 is fixedly installed on the upper end of the pump body 4, the connecting rod 1 and the lock cover 3 are slidably fitted, the piston rod 6 is fixedly connected to the connecting rod 1, the piston 5 is slidably installed in the piston rod 6, and the piston 5 is slidably installed in the pump body 4 and is connected between the pump body 4 and sealed. As shown in Figures 5 and 6, a push head hat 8 is fixed to the upper end of the connecting rod 1, the pump body 4 is attached to a pump cover 9 of a container such as a bottle, and a straw 10 is fixed to the lower part of the valve seat 7, which extends into the container to absorb liquid.

[0025] The detailed structure of the liquid pump is described as follows.

[0026] The pump body 4 is an integral part made of the same material, in this embodiment, the pump body 4 is obtained by integrally molding with PP plastic, of course, the pump body 4 can also be molded with the same type of conventional plastic as PP plastic. Specifically, as shown in Figures 11 to 13, the pump body 4 includes a shell 41 with a hollow pump cavity and an elastic valve plate 42 installed at the bottom end of the shell 41, the elastic valve plate 42 is integrally molded with the bottom end of the shell 41, and the elastic valve plate 42 is provided with a valve channel.

[0027] Specifically, the elastic valve plate 42 includes a valve plate 421 and an elastic strip 422 connected between the valve plate 421 and the inner peripheral wall of the shell 41, and there are multiple gaps between the elastic strip 422 and the valve plate 421 and between the elastic strip 422 and the inner peripheral wall of the shell 41, and all the gaps together form a valve channel of the pump body 4.

[0028] Here, the valve plate 421 is disk-shaped, and a plurality of elastic strips 422 are provided, specifically three elastic strips 422, which are arranged at intervals along the circumferential direction on the outer circumferential side of the valve plate 421. Each elastic strip 422 includes an arc-shaped extension portion 422a, a first connection portion 422b and a second connection portion 422c respectively provided at both ends of the arc-shaped extension portion 422a, and the arc-shaped extension locus of the arc-shaped extension portion 422a is a part of a circular arc with the center of the valve plate 421 as the center of rotation, the first connection portion 422b extends radially inward from the arc-shaped extension portion 422a and is connected to the valve plate 421, and the second connection portion 422c extends radially outward from the arc-shaped extension portion 422a and is connected to the shell 41.

[0029] The valve seat 7 is fitted under the elastic valve plate 42, as shown in Figs. 3 to 6, 18 and 19, the valve seat 7 includes a valve body 71 with a liquid flow channel 711, and a sealing structure is provided on the upper part of the valve body 71 to seal with the elastic valve plate 42. Here, the sealing structure includes an annular boss 72 provided on the upper part of the valve body 71, and the upper end surface of the annular boss 72 is fitted and contacted with the bottom end surface of the valve plate 421 to realize a seal between the annular boss 72 and the valve plate 421, and further used to realize a seal to the liquid flow channel 711 through the valve plate 421. The annular boss 72 is surrounded by the mouth of the liquid flow channel 711. When the valve seat 421 is not in contact with the annular boss 72, the liquid flow channel 711 communicates with the valve channel of the pump body 4.

[0030] In other embodiments, the upper flat surface of the valve body 71 can be fitted directly against the bottom surface of the valve plate 421 to form a seal between the two, i.e., the upper flat surface of the valve body 71 directly constitutes the above-mentioned sealing structure.

[0031] The valve seat 7 is also an integral part molded from PP plastic, in other embodiments the valve seat 7 can be molded from the same type of conventional plastic as PP plastic, and preferably the valve seat 7 and pump body 4 are each molded using the same recyclable plastic.

[0032] When fitting and installing between the valve seat 7 and the pump body 4, the valve seat 7 is removably engaged and fixed to the bottom of the shell 41 and is under the elastic valve plate 42. Specifically, an annular protrusion 73 is installed on the top of the valve body 71, an annular engagement groove is opened under the pump body 4, the valve body 71 is inserted upward to the bottom of the pump body 4, and the annular protrusion 73 and the annular engagement groove are fitted together to complete the assembly between the two. At this time, the upper end surface of the annular boss 72 abuts against the bottom end surface of the valve plate 421, and the elastic deformation of the elastic valve plate 42 switches the elastic valve plate 42 between an open state (the liquid flow channel 711 communicates with the valve channel of the pump body 4) and a closed state (the communication between the liquid flow channel 711 and the valve channel of the pump body 4 is closed). The sealing effect of the valve seat 7 can be adjusted by adjusting the height of the annular boss 72.

[0033] Specifically, when the elastic valve plate 42 is in an open state, the valve plate 421 elastically moves upwards, disengaging the engagement between the valve seat 421 and the annular boss 72, and the seal between the two is released, so that the valve channel communicates with the liquid flow channel 711; when the elastic valve plate 42 is in a closed state, the valve plate 421 resets and engages with the valve seat 421 and the annular boss 72 in a sealed manner, so that the valve channel does not communicate with the liquid flow channel 711. In this way, by changing the internal gas pressure of the pump body 4, the elastic valve plate 42 can be switched between an open state and a closed state only by correspondingly elastically deforming the elastic valve plate 42, so that the liquid passes through the liquid flow channel 711 and then enters the pump body 4 from the valve channel. The structure is simple, and the pump body 4 and the valve seat 7 are respectively integrally molded with PP plastic, with low production process and cost, and very convenient assembly.

[0034] 3, 4, and 14 to 17, the piston rod 6 includes a rod body 61 that is mated and connected to the connecting rod 1, and a piston head 62 that is fixedly installed at the lower end of the rod body 61. The piston rod 6 is connected to the lower part of the connecting rod 1, the connecting rod 1 has a mounting hole extending along the axial direction, the rod body 61 of the piston rod 6 is drilled to fit into the mounting hole along the axial direction, and the piston rod 6 is located below the connecting rod 1.

[0035] An interfitting clamp structure is provided between the outer circumference of the piston rod 6 and the inner circumference wall of the mounting hole of the connecting rod 1. Specifically, the clamp structure includes an annular positioning protrusion 12 provided on the inner circumference wall of the mounting hole of the connecting rod 1 and a positioning groove 6a provided on the outer circumference of the rod body 61 of the piston rod 6, and the annular positioning protrusion 12 fits into and is locked in the positioning groove 6a.

[0036] The clamping structure also includes a plurality of annular engaging grooves 13 spaced apart along the axial direction of the connecting rod 1 on the inner peripheral wall of the mounting hole of the connecting rod 1, and a plurality of annular engaging bosses 6b spaced apart along the axial direction of the piston rod 6 on the outer peripheral part of the rod body 61, and the positioning grooves 6a are located above all the annular engaging bosses 6b, and all the annular engaging bosses 6b are engaged with and engaged in a one-to-one correspondence with all the annular engaging grooves 13. In this embodiment, two sets of the annular engaging bosses 6b and the annular engaging grooves 13 are provided, and the connecting rod 1 and the piston rod 6 are both made of PP or PE material. In this way, not only can the materials of the connecting rod 1 and the piston rod 6 be reliably recycled, but the fitting connection structure of the two can also fully and effectively ensure that the two are prevented from loosening and falling off, so that the connection between them is sufficiently stable and efficient.

[0037] An axially extending liquid discharge channel 611 is opened in the rod body 61 of the piston rod 6, and a liquid discharge hole 612 communicating with the liquid discharge channel 611 is opened in the lower part of the rod body 61 at a position close to the piston head 62, and the piston 5 is fitted into the rod body 61 and positioned above the piston head 62.

[0038] The piston 5 has an inner piston body 52 which slides in engagement with the rod body 61, and an outer piston body 51 which slides in engagement with the pump body 4, and the inner piston body 52 and the outer piston body 51 are fixedly connected at their intermediate positions. The inner piston body 52 and the outer piston body 51 are disposed at the upper and lower ends of the piston 5 with a radial gap therebetween.

[0039] Between the piston head 62 and the rod body 61, an annular groove 63 is formed into which the lower end of the inner piston body 52 can be inserted. 63An annular inclined surface 63a is formed on the outer groove wall of the piston rod 62, and an annular inclined surface 52a is formed on the outer surface of the bottom end of the inner piston body 52. ​​When the lower end of the inner piston body 52 is inserted into the annular groove 63, the annular inclined surface 52a and the annular inclined surface 63a are fitted and contacted with each other to form a seal between them. When the piston 5 is fitted and sealed with the piston head 62, the liquid in the cavity of the pump body 4 cannot enter the piston rod 6, and further cannot enter the liquid discharge channel 611. When the piston 5 is not fitted with the piston head 62, the liquid in the cavity of the pump body 4 can sequentially pass through the gap between the piston 5 and the piston head 62, the liquid discharge hole 612, enter the liquid discharge channel 611, and then pass through the connecting rod 1 to be pumped out.

[0040] Furthermore, the above-mentioned installation of the piston 5 and the piston rod 6 provides the piston 5 with a crack-preventing effect. When the piston rod 6 moves upward to drive the piston 5 and is maintained at the top end for a long time due to the action of the spring 2, the annular inclined surface 52A of the inner piston body 52 receives a radially inward acting force from the annular inclined surface 63a, so that the piston 5 will not be cracked or deformed by the action of the piston rod 6 even after a long period of use or frequent use.

[0041] 3 and 4, an annular groove is also formed between the upper part of the inner piston body 52 of the piston 5 and the upper part of the outer piston body 51, the inner piston body 52 of the piston 5 is fitted into the rod body 61 of the piston rod 6, and the lower part of the connecting rod 1 is fitted into the upper part of the inner piston body 52, so that it can be fitted and inserted into the above annular groove. The configuration between the connecting rod 1, the piston 5 and the piston rod 6 should be as follows: during the process of driving the connecting rod 1 downward, after the connecting rod 1 and the piston rod 6 move downward at a distance, the bottom end face of the connecting rod 1 abuts against the bottom groove wall of the annular groove to push and move downward together with the piston 5, and during the downward movement, the seal between the piston 5 and the piston head 62 is released, and when the connecting rod 1 moves upward, the piston head 62 moves upward and first contacts the piston 5, seals with the piston 5, and then moves upward synchronously with the piston 5.

[0042] The lock cover 3 has a through hole extending in the axial direction, which is mainly used for mounting the connecting rod 1. The lock cover 3 has a number of ribs 31 extending in the vertical direction on its inner periphery, all of which are spaced apart in the circumferential direction, with an air channel formed between two adjacent ribs 31, and the connecting rod 1 fits into and passes through the through hole in the axial direction.

[0043] In this embodiment, a balanced air hole 43 is further drilled on the top of the shell 41 of the pump body 4, and the balanced air hole 43 communicates with the hollow pump cavity. During the process of the connecting rod 1 sliding against the lock cover 3, when the piston 5 cannot cover the balanced air hole 43, the outside air can enter the pump body 4 and enter the bottle body through the balanced air hole 43 on the pump body 4, so as to balance the air pressure inside and outside the bottle and avoid the occurrence of underfilling situation caused by the uneven air pressure in the bottle body.

[0044] The outer circumference of the lock cover 3 and the upper part of the pump body 4 are fixed by interfitting with a plurality of pairs of engagement grooves and protrusions 32, which serve to prevent them from loosening and falling off and to provide a sealing effect against each other. The spring 2 is installed between the connecting rod 1 and the lock cover 3, and provides the acting force required for the connecting rod 1 to move upward and away from the lock cover 3.

[0045] The connecting rod 1 is provided with an upper limit flange 15 and a lower limit flange 14, the lower limit flange 14 is used to abut against the upper part of the lock cover 3 to limit the limit position of the downward movement of the connecting rod 1, an annular flange 33 is provided on the lock cover 3, the spring 2 is fitted onto the connecting rod 1 and partially fitted onto the upper part of the lock cover 3, and both ends of the spring 2 are in contact between the upper limit flange 15 and the annular flange 33.

[0046] The annular flange installed at the upper end of the pump body 4 also only needs to fit with the lock cover 3 and does not need to be increased in size, so there is no need to leave a large-sized flange in the pump cover 9 to fit, effectively reducing the external size of the product.

[0047] A limiting boss 11 is provided at the lower end of the connecting rod 1, protruding outward along the outer peripheral wall of the connecting rod 1, and the outer diameter of the limiting boss 11 is larger than the hole diameter of the through hole of the lock cover 3, and the limiting boss 11 is located below the lock cover 3. This can effectively prevent the connecting rod 1 from coming out of the lock cover 3.

[0048] The overall assembly diagram of the liquid pump is shown in Figures 3 to 6. When the liquid pump is in operation, the push head hat 8 is pressed to operate the connecting rod 1 to drive the piston rod 6 and the piston 5 downward. During the downward movement, the piston rod 6 will first separate from the piston 5. Under the action of the spring 2, the connecting rod 1 will reset upward, so that the piston rod 6 and the piston 5 will rise synchronously, and will be sealed and fitted between the piston rod 6 and the piston 5. The pressure in the hollow pump cavity below the piston 5 will decrease, the elastic valve plate 42 will deform, the valve plate 421 will move upward and separate from the valve seat 7, the seal between the valve plate 421 and the valve seat 7 will be released, and the liquid in the container will pass through the liquid flow channel 711 and the valve channel into the pump body 4, and be stored in the hollow pump cavity below the piston 5 to absorb the liquid. After the connecting rod 1 is completely reset, the valve plate 421 will reset and the valve channel will be closed.

[0049] Again, the push head hat 8 is forced to drive the connecting rod 1, thereby driving the piston rod 6 and the piston 5 downward, and since the piston rod 6 slides relative to the piston 5, the seal between the piston rod 6 and the piston 5 is released, and the liquid stored in the pump body 4 enters the connecting rod 1 and is pumped out through the liquid discharge hole 612 and the liquid discharge channel 611, thereby realizing the liquid discharge operation.

[0050] Example 2 As shown in Figures 20 to 27, the main difference between the liquid pump shown in Example 2 and the liquid pump of Example 1 is that the liquid pump of Example 2 is a vacuum pump, and there is no need to install balanced air holes in the shell 41 of the pump body 4.

[0051] In summary, the overall number of parts of the liquid pump of the present invention is small, which saves production costs, makes product assembly more convenient, and increases the durability of the product; at the same time, each part of the liquid pump is basically made of recyclable plastic and can be fully recycled.

[0052] The above examples are only intended to explain the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand and implement the content of the present invention, and cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid pump, comprising a pump body and a valve seat, the valve seat being attached to a lower end of the pump body, the pump body being an integral part molded from the same material, the pump body comprising a shell with a hollow pump cavity and a resilient valve plate mounted at a bottom end of the shell, the resilient valve plate having a valve channel, the valve seat being mounted below the resilient valve plate, the valve seat comprising a valve body with a liquid flow channel, the valve body being provided at an upper portion with a seal structure for sealingly mating with the resilient valve plate, The liquid pump comprises: a piston and a piston rod, the piston rod including a rod body and a piston head fixedly installed at a lower end of the rod body, the rod body being provided with a liquid discharge channel extending in an axial direction, and a liquid discharge hole communicating with the liquid discharge channel being opened at a lower part of the rod body; the piston having an inner piston body and an outer piston body fixedly installed coaxially, the inner piston body being installed to slidably fit into the rod body, the outer piston body being installed to slidably fit into the hollow pump cavity of the pump body, and an annular groove being formed between the piston head and the rod body, into which a lower end of the inner piston body can be fitted; a connecting rod having an attachment hole extending along an axial direction, the rod body of the piston rod passing through the attachment hole along the axial direction so as to be able to fit into the attachment hole, and a clamp structure that fits between an outer periphery of the piston rod and an inner periphery of the attachment hole is provided; a lock cover fixedly installed on an upper end of the pump body and slidably fitted with the connecting rod; a resilient element disposed between the lock cover and the connecting rod to provide a force required for the connecting rod to move upwardly and away from the lock cover; the clamp structure includes an annular positioning protrusion provided on an inner peripheral wall of the mounting hole and a positioning groove provided on an outer peripheral portion of the piston rod, the annular positioning protrusion being fitted into the positioning groove, the clamp structure includes a plurality of annular engagement grooves axially spaced apart on the inner peripheral wall of the mounting hole and a plurality of annular engagement bosses axially spaced apart on the outer peripheral portion of the piston rod, the annular positioning protrusion being located above all of the annular engagement grooves, the positioning grooves being located above all of the annular engagement bosses, and all of the annular engagement bosses being fitted into and engaged with all of the annular engagement grooves in a one-to-one correspondence.

2. A liquid pump, comprising a pump body and a valve seat, the valve seat being attached to a lower end of the pump body, the pump body being an integral part molded from the same material, the pump body comprising a shell with a hollow pump cavity and a resilient valve plate mounted at a bottom end of the shell, the resilient valve plate having a valve channel, the valve seat being mounted below the resilient valve plate, the valve seat comprising a valve body with a liquid flow channel, the valve body being provided at an upper portion with a seal structure for sealingly mating with the resilient valve plate, The liquid pump comprises: a piston and a piston rod, the piston rod including a rod body and a piston head fixedly installed at a lower end of the rod body, the rod body being provided with a liquid discharge channel extending in an axial direction, and a liquid discharge hole communicating with the liquid discharge channel being opened at a lower part of the rod body; the piston having an inner piston body and an outer piston body fixedly installed coaxially, the inner piston body being installed to slidably fit into the rod body, the outer piston body being installed to slidably fit into the hollow pump cavity of the pump body, and an annular groove being formed between the piston head and the rod body, into which a lower end of the inner piston body can be fitted; a connecting rod having an attachment hole extending along an axial direction, the rod body of the piston rod passing through the attachment hole along the axial direction so as to be able to fit into the attachment hole, and a clamp structure that fits between an outer periphery of the piston rod and an inner periphery of the attachment hole is provided; a lock cover, which is fixedly installed on an upper end of the pump body and slidably fitted with the connecting rod, the lock cover having a through hole extending axially therethrough, the connecting rod being inserted axially into the through hole so as to slidably fit therein; the liquid pump also includes an elastic part installed between the upper end of the lock cover and the upper end of the connecting rod, providing a force required for the upward movement of the connecting rod; a limiting boss is provided at the lower end of the connecting rod, which protrudes outward along an outer peripheral wall of the connecting rod, the outer diameter of the limiting boss being larger than the diameter of the through hole, the limiting boss being located below the lock cover; an inner peripheral part of the lock cover has a plurality of ribs extending in an up-down direction, all of the ribs are spaced apart along the circumferential direction, and an air channel is formed between two adjacent ribs; a resilient element disposed between the locking cover and the connecting rod, the resilient element providing the force required to move the connecting rod upwardly and away from the locking cover.

3. 3. The liquid pump of claim 1, wherein the elastic valve plate includes a valve plate, an elastic strip connected between the valve plate and an inner peripheral wall of the shell, and a plurality of gaps between the elastic strip and the valve plate and between the elastic strip and the inner peripheral wall of the shell, all of the gaps together forming the valve channel.

4. 4. The liquid pump according to claim 3, wherein the valve plate is disk-shaped, the elastic strip is multiple, and all of the elastic strips are arranged circumferentially at intervals on the circumferential outer side of the valve plate, each of the elastic strips includes an arc-shaped extension portion, a first connecting portion and a second connecting portion respectively installed at both ends of the arc-shaped extension portion, the extension locus of the arc-shaped extension portion is a part of a circular arc with the center of the valve plate as the center of rotation, the first connecting portion extends radially inward from the arc-shaped extension portion and is connected to the valve plate, and the second connecting portion extends radially outward from the arc-shaped extension portion and is connected to the shell.

5. 5. The liquid pump according to claim 4, wherein the elastic strips are arranged in threes at equal intervals along the circumferential direction.

6. 4. The liquid pump according to claim 3, wherein the sealing structure is an annular boss or a flat surface installed on the upper part of the valve body, and the upper end surface of the annular boss or the flat surface fits and contacts the bottom end surface of the valve plate.

7. 4. The liquid pump of claim 3, wherein the resilient valve plate has an open state and a closed state, and when the resilient valve plate is in the open state, the valve plate resiliently moves upward, the valve plate disengages from the sealing structure, and the valve channel communicates with the liquid flow channel, and when the resilient valve plate is in the closed state, the valve plate resets and sealingly engages between the valve plate and the sealing structure, and the valve channel does not communicate with the liquid flow channel.

8. 3. A liquid pump as claimed in claim 1 or 2, wherein the valve seat is removably engaged and secured to a lower portion of the shell and below the elastomeric valve plate.

9. 3. A liquid pump as claimed in claim 1 or 2, wherein both the valve seat and the pump body are moulded from a recyclable plastic.

10. 3. The liquid pump according to claim 2, wherein the outer periphery of the lock cover and the upper part of the pump body are engaged and fixed by fitting a plurality of pairs of engagement grooves and protrusions into each other between the outer periphery of the lock cover and the upper part of the pump body.

11. 3. The liquid pump according to claim 1, wherein the inner piston body and the outer piston body are fixedly connected at an intermediate position, and at the upper and lower ends of the piston, the inner piston body and the outer piston body are arranged at a distance from each other in the radial direction of the piston.

12. 3. The liquid pump according to claim 1, wherein the outer peripheral groove of the annular groove forms one annular inclined surface, and the bottom end outer surface of the inner piston body forms another annular inclined surface, and when the lower end of the inner piston body is inserted into the annular groove, the two annular inclined surfaces fit together and come into contact with each other to form a seal between the piston and the piston head.

13. The liquid pump according to claim 12, characterized in that the liquid discharge hole is provided in a lower part of the rod body near the piston head, and a gap is provided between the lower inner surface of the inner piston body and the rod body.

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