Plastic spring for a lotion pump and a lotion pump

Abstract

The utility model provides a kind of plastic spring and emulsion pump for emulsion pump, by being arranged as including first end side ring, intermediate elastic piece, second end side ring in turn, and, the one-way valve unit being installed on second end side ring, first end side ring and second end side ring are respectively used to abut to piston component and pump cavity bottom surface;Setting the one-way valve unit for realizing the one-way communication of liquid supplementing port on second end side ring, and setting the axial extension piece for slidingly connecting to piston rod on one-way valve unit, it can be opened by the sliding contact of axial extension piece and preset opening force for opening one-way valve unit is applied.This embodiment plastic spring is based on realizing elastic force reset and one-way opening liquid supplementing port, overall material is plastic, avoid the scheme that existing emulsion pump uses spring and steel ball, eliminate material body and metal contact, prevent material body metamorphic.

Description

Technical Field

[0001] This utility model belongs to the field of emulsion pump technology, and particularly relates to a plastic spring for an emulsion pump and an emulsion pump. Background Technology

[0002] As a widely used liquid dispensing device in cosmetics and daily chemical products, the core function of an emulsion pump is to allow users to pump the product out of the container by pressing the pump for use.

[0003] Currently, mainstream emulsion pumps on the market are typically assembled from more than ten independent parts, including a locking cap, piston rod, pump chamber, spring, suction tube, ball valve (inlet / outlet valve), sealing ring, clamping plate, and protective sleeve. This results in the following main defects in existing emulsion pumps:

[0004] Existing springs and steel balls used as one-way valves are all made of metal. When the emulsion comes into contact with the metal, it can easily cause the emulsion to deteriorate, thus affecting the emulsion's effectiveness. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a plastic spring for an emulsion pump and an emulsion pump, so as to solve the problem that the material is easily deteriorated due to the use of metal parts such as springs and steel balls in existing emulsion pumps.

[0006] To solve the above problems, the technical solution of this utility model is as follows:

[0007] This utility model discloses a plastic spring for an emulsion pump, used for installation inside the pump chamber of the emulsion pump, comprising:

[0008] A first elastic body includes a first end ring, an intermediate elastic element, and a second end ring connected in sequence; the first end ring is configured to be fitted into a piston component inside a pump chamber, the second end ring is configured to be fitted into the bottom surface of the pump chamber, and the intermediate elastic element is configured to avoid being located on the piston rod of the emulsion pump.

[0009] It also includes a one-way valve unit connected to the second end ring, the one-way valve unit being configured to prevent material in the pump chamber from leaking out of the replenishment port on the pump chamber, and the one-way valve unit having an axial extension for sliding connection to the piston rod.

[0010] The plastic spring for an emulsion pump of this utility model has a central through hole on both the first end ring and the second end ring for the piston rod to pass through, and an axial guide sleeve on both the first end ring and the second end ring for fitting and guiding the piston rod to slide.

[0011] The present invention relates to a plastic spring for an emulsion pump, wherein two symmetrically arranged sliding guide grooves are provided on the first end side ring, and the sliding guide grooves are configured to cooperate with the internal structure of the pump cavity to limit the circumferential rotation of the first end side ring.

[0012] The present invention relates to a plastic spring for an emulsion pump, wherein the second end side plate is provided with a plurality of limiting ribs on the surface facing the bottom of the pump cavity, and the limiting ribs are configured to cooperate with the bottom surface structure of the valve cavity to limit the circumferential rotation of the second end side ring.

[0013] The present invention relates to a plastic spring for an emulsion pump, wherein the intermediate elastic element comprises a first sub-elastic element, an intermediate connecting ring, and a second sub-elastic element connected sequentially along the axial direction;

[0014] Both the first and second sub-elastic elements include two arc-shaped elastic sheets arranged symmetrically with respect to the axial direction.

[0015] The present invention relates to a plastic spring for an emulsion pump, wherein the one-way valve unit includes a valve core and a second elastic body;

[0016] The two ends of the second elastic body are respectively connected to the valve core and the intermediate elastic element. The second elastic body is configured to apply elastic force to push the valve core to close the liquid inlet in the absence of external force.

[0017] The present invention relates to a plastic spring for an emulsion pump, wherein the axial extension is inserted through the second elastic body, and the first end of the axial extension is connected to the valve core, and the diameter of the second end of the axial extension gradually decreases.

[0018] The present invention relates to a plastic spring for an emulsion pump, wherein the sealing surface of the valve core is hemispherical, and the second elastic body is a spring configuration.

[0019] The present invention relates to a plastic spring for an emulsion pump, wherein the first end ring, the intermediate elastic element, the second end ring, the one-way valve unit, and the axial extension element are integrally formed.

[0020] This utility model provides an emulsion pump, comprising a pump body, a pressure head, and a plastic spring as described in any one of the above-mentioned components;

[0021] The pump body is configured to have a pump chamber with an upward opening, and the bottom surface of the pump chamber is provided with a connecting connector for connecting a liquid inlet tube, the channel of the connecting connector being the liquid replenishment port;

[0022] The pressure head is configured to switch between a reset configuration and a compression configuration relative to the pump body; the pressure head includes a pressure head body and a piston rod and a piston sleeve connected to the pressure head body; the piston rod communicates with the liquid outlet channel of the pressure head body and extends into the pump chamber; the piston sleeve is fitted onto the piston rod, and the piston sleeve is reciprocatingly sealed and connected to the pump chamber;

[0023] The intermediate elastic element is configured to apply an elastic force to at least a portion of the pressure head via a first end side to push the pressure head to the reset configuration in the absence of external force.

[0024] During at least a portion of the stroke in which the pressure head transitions from the compression configuration to the reset configuration, the piston tube is configured to apply a preset opening force to the axial extension; the one-way valve unit is configured to open the replenishment port under the action of negative pressure in the pump chamber and / or the preset opening force.

[0025] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0026] I. One embodiment of this utility model comprises a plastic spring consisting of a first end ring, an intermediate elastic element, a second end ring connected in sequence, and a one-way valve unit mounted on the second end ring. The first and second end rings are respectively used to abut against the piston component and the bottom surface of the pump chamber, and the intermediate elastic element is used to provide an elastic force to reset the piston component. Taking advantage of the characteristic that the second end ring is in contact with the bottom surface of the valve chamber during both compression and reset, a one-way valve unit for realizing one-way communication of the replenishment port is provided on it. An axial extension for sliding connection to the piston rod is provided on the one-way valve unit, so that during the piston rod reset process, a preset opening force for opening the one-way valve unit can be applied through sliding contact with the axial extension, thereby improving the opening capability of the one-way valve unit. In this embodiment, the plastic spring achieves elastic force reset and one-way opening of the liquid inlet. The entire material is plastic, which avoids the spring and steel ball solution used in existing emulsion pumps, prevents the material from coming into contact with metal, and prevents the material from deteriorating. In addition, the entire pump head is made of plastic, which can be recycled as a whole, saving disassembly and recycling work, making it more environmentally friendly and saving manpower.

[0027] II. One embodiment of this utility model configures the emulsion pump as including a pump body, a pressure head, and a plastic spring. The pressure head is configured as a pressure head body and a piston rod and piston sleeve connected thereto. The elastic assembly is configured as a first elastic body and a one-way valve unit connected thereto. The piston sleeve is configured to reciprocate and seal with the pump cavity of the pump body, thereby adjusting the cavity volume through the axial sliding of the piston sleeve and the pump body. The first elastic body is configured to push the pressure head where the piston sleeve is located back to the reset configuration. The one-way valve unit is used to close the connecting joint on the pump body in the non-operating state and during the transition from the reset configuration to the compression configuration. Furthermore, the piston rod is configured to apply a preset opening force to the one-way valve unit during at least a part of the stroke of the transition from the compression configuration to the reset configuration, thereby causing the pressure head to open the connection between the connecting joint and the pump cavity under the action of the preset opening force and / or the negative pressure formed by the increase in cavity volume during the transition from the compression configuration to the reset configuration. This embodiment only requires assembling the pump body, the pressure head, and the plastic spring, and installing a liquid inlet tube on the connecting joint to complete the assembly of the emulsion pump. It has few parts and is simple to assemble. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a plastic spring for an emulsion pump according to Embodiment 1 of this utility model;

[0029] Figure 2 This is another schematic diagram of a plastic spring for an emulsion pump according to Embodiment 1 of this utility model;

[0030] Figure 3 This is a cross-sectional view of a plastic spring for an emulsion pump according to Embodiment 1 of this utility model;

[0031] Figure 4 This is an exploded view of the emulsion pump according to Embodiment 2 of this utility model;

[0032] Figure 5 This is a cross-sectional view of the emulsion pump according to Embodiment 2 of this utility model.

[0033] Explanation of reference numerals in the attached drawings: 1. Plastic spring; 101. First elastic body; 1011. First end side ring; 1012. Intermediate elastic body; 10121. First sub-elastic element; 10122. Intermediate connecting ring; 10123. Second sub-elastic element; 1013. Second end side ring; 102. One-way valve unit; 1021. Valve core; 1022. Second elastic body; 1023. Axial extension; 103. Axial guide sleeve; 2. Pump body; 201. Pump chamber; 202. Connecting connector; 203. Connecting threaded sleeve; 204. Blocking ring; 3. Pressure head; 301. Pressure head body; 202. Piston rod; 3021. Liquid outlet pipe body; 3022. Radial contraction section; 303. Piston sleeve; 3031. Annular piston protrusion. Detailed Implementation

[0034] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a plastic spring for an emulsion pump and an emulsion pump according to the present invention. The advantages and features of the present invention will become clearer from the following description and claims.

[0035] Example 1

[0036] See Figures 1 to 3 In one embodiment, a plastic spring 1 for an emulsion pump is used to be installed in the pump chamber 201 of the emulsion pump. The plastic spring 1 includes a first elastic body 101 and a one-way valve unit 102.

[0037] The first elastic body 101 includes a first end ring 1011, an intermediate elastic element, and a second end ring 1013 connected in sequence. The first end ring 1011 is configured to be fitted into a piston component inside the pump chamber 201; the second end ring 1013 is configured to be fitted into the bottom surface of the pump chamber 201; the intermediate elastic element is configured to avoid the piston rod 202 of the emulsion pump, specifically by means of a sleeve installation. A one-way valve unit 102 is connected to the second end ring 1013. The one-way valve unit 102 is configured to prevent the material inside the pump chamber 201 from leaking out through the replenishment port on the pump chamber 201, and the one-way valve unit 102 is provided with an axial extension 1023 for sliding connection to the piston rod 202.

[0038] In this embodiment, the plastic spring 1 is configured to include a first end ring 1011, an intermediate elastic element, a second end ring 1013 connected in sequence, and a one-way valve unit 102 mounted on the second end ring 1013. The first end ring 1011 and the second end ring 1013 are respectively used to abut against the piston component and the bottom surface of the pump chamber 201, and the intermediate elastic element is used to provide elastic force to reset the piston component. Taking advantage of the characteristic that the second end ring 1013 is in contact with the bottom surface of the valve chamber during compression and reset, a one-way valve unit 102 for realizing one-way communication of the replenishment port is set on it. An axial extension 1023 for sliding connection to the piston rod 202 is set on the one-way valve unit 102, so that during the reset process of the piston rod 202, a preset opening force for opening the one-way valve unit 102 can be applied through sliding contact with the axial extension 1023, thereby improving the opening capability of the one-way valve unit 102. In this embodiment, the plastic spring 1 achieves elastic force reset and one-way opening of the liquid replenishment port. The entire material is plastic, which avoids the spring and steel ball scheme used in existing emulsion pumps, prevents the material from coming into contact with metal, and prevents the material from deteriorating. In addition, the entire pump head is made of plastic, which can be recycled as a whole, saving disassembly and recycling operations, making it more environmentally friendly and saving manpower.

[0039] The specific structure of the plastic spring 1 used in the emulsion pump in this embodiment will be further described below:

[0040] In this embodiment, both the first end ring 1011 and the second end ring 1013 are provided with a central through hole for the piston rod 202 to pass through. Specifically, after the emulsion pump is assembled, the piston rod 202 passes downward through the central through hole and the intermediate elastic element of the first end ring 1011, and the axial extension 1023 passes upward through the central through hole of the second end ring 1013 and is inserted into the piston rod 202. Furthermore, to ensure the stability of the piston rod 202's axial movement, both the first end ring 1011 and the second end ring 1013 are provided with an axial guide sleeve 103 for fitting and guiding the piston rod 202 to slide. Specifically, the axial guide sleeve 103 can be two symmetrically arranged axial guide arms, which are axially connected to the corresponding end rings and match the inner ring surface of the corresponding central through hole.

[0041] In this embodiment, the first end ring 1011 is provided with two symmetrically arranged sliding guide grooves, which are configured to cooperate with the internal structure of the pump cavity 201 to limit the circumferential rotation of the first end ring 1011. Specifically, two symmetrical sliding guide grooves can be provided on the first end ring 1011, and two corresponding axial guide strips can be provided on the inner cavity surface of the pump cavity 201. In this way, the axial movement of the first end ring 1011 can be guided and its circumferential rotation can be limited during the transition from the reset configuration to the compression configuration. Since the second end ring 1013 abuts against the bottom surface of the pump cavity 201 under the action of elastic force and does not need to move, several limiting ribs can be provided on the surface of the second end ring 1013 facing the bottom surface of the pump cavity 201, and corresponding limiting grooves can be provided on the bottom surface of the pump cavity 201. In this way, the circumferential movement of the second end ring 1013 can be limited by the cooperation of the limiting ribs and the limiting grooves.

[0042] In this embodiment, the intermediate elastic element includes a first sub-elastic element 10121, an intermediate connecting ring 10122, and a second sub-elastic element 10123 connected sequentially along the axial direction. The intermediate connecting ring 10122 is also provided with a central through hole and a sliding guide groove corresponding to the first end side ring 1011, so as to realize the piston rod 202 passing through and the axial movement guidance between it and the axial guide strip.

[0043] The first sub-elastic element 10121 and the second sub-elastic element 10123 both include two arc-shaped elastic plates arranged symmetrically with respect to the axial direction. Specifically, the two arc-shaped elastic plates of the first sub-elastic element 10121 are respectively installed between the first end ring 1011 and the intermediate connecting ring 10122 (and are located away from the central through hole), and the concave surfaces generated by the bending arc of the two arc-shaped elastic plates are also symmetrically arranged with respect to the axis. This can improve the stability of the force exerted by the arc-shaped elastic plates on the intermediate connecting ring 10122 during the bending process, so as to avoid the intermediate connecting ring 10122 from deflecting during the downward axial movement, which would lead to unsmooth axial sliding. The two arc-shaped elastic plates of the second sub-elastic element 10123 are arranged in the same way.

[0044] In this embodiment, the one-way valve unit 102 may specifically include a valve core 1021 and a second elastic body 1022. The two ends of the second elastic body 1022 are respectively connected to the valve core 1021 and an intermediate elastic element. The second elastic body 1022 is configured to apply an elastic force to push the valve core 1021 to close the fluid inlet in the absence of external force. Specifically, the second elastic body 1022 may be configured as a spring. Specifically, the first end of the second elastic body 1022 may be connected to a second end ring 1013, thereby allowing the first end of the second elastic body 1022 to remain relatively fixed. The valve core 1021 located at the second end of the second elastic body 1022 may be hemispherical with a diameter larger than the diameter of the fluid inlet, so that the hemispherical valve core can tightly fit against the fluid inlet under the action of the second elastic body 1022 to achieve its sealing purpose.

[0045] In this embodiment, the axial extension 1023 passes through the second elastic body 1022, and the first end of the axial extension 1023 is connected to the valve core 1021. Specifically, the first end of the axial extension 1023 is connected to the hemispherical valve core, and the second end of the axial extension 1023 passes through the spring-configured second elastic body 1022 and extends axially toward the pump chamber 201. Furthermore, to facilitate assembly, the diameter of the second end of the axial extension 1023 gradually decreases, making it easier to guide the second end of the axial extension 1023 into the piston rod 202 during assembly.

[0046] In this embodiment, the first end ring 1011, the intermediate elastic element, the second end ring 1013, the one-way valve unit 102, and the axial extension 1023 are integrally formed, which can further reduce the number of parts during assembly and simplify the assembly process.

[0047] Example 2

[0048] See Figures 4 to 5This embodiment provides an emulsion pump based on the above embodiment one. The emulsion pump includes a pump body 2, a pressure head 3, and the plastic spring 1 in the above embodiment one.

[0049] The pump body 2 is configured to have a pump chamber 201 with the opening facing upward. The bottom surface of the pump chamber 201 is provided with a connecting connector 202 for connecting the liquid inlet tube. The channel of the connecting connector 202 is a liquid replenishment port.

[0050] The pressure head 3 is configured to switch between a reset configuration and a compression configuration relative to the pump body 2. The pressure head 3 includes a pressure head body 301 and a piston rod 202 and a piston sleeve 303 connected to the pressure head body 301. The piston rod 202 communicates with the liquid outlet passage of the pressure head body 301 and extends into the pump chamber 201. The piston sleeve 303 is fitted onto the piston rod 202 and is reciprocally and sealingly connected to the pump chamber 201.

[0051] The intermediate elastic element is configured to apply an elastic force to at least a portion of the pressure head 3 via the first end ring 1011, thereby pushing the pressure head 3 to a reset configuration without external force. Specifically, the first elastic body 101 is used to push the pressure head 3 as a whole relative to the pump body 2 toward the opening of its pump chamber 201. The one-way valve unit 102 is configured to close the connecting joint 202 to restrict the flow of fluid from the pump chamber 201 out of the connecting joint 202, thereby preventing fluid from flowing back into the emulsion bottle during compression, which could prevent it from being squeezed out from the pressure head body 301.

[0052] During at least a portion of the stroke in which the pressure head 3 transitions from a compression configuration to a reset configuration, the piston tube is configured to apply a preset opening force to the axial extension 1023. The one-way valve unit 102 is configured to open the replenishment port under the action of negative pressure and / or the preset opening force within the pump chamber 201.

[0053] In this embodiment, the emulsion pump is configured to include a pump body 2, a pressure head 3, and a plastic spring 1. The pressure head 3 is configured as a pressure head body 301 and a piston rod 202 and a piston sleeve 303 connected thereto. The elastic assembly is configured as a first elastic body 101 and a one-way valve unit 102 connected thereto. The piston sleeve 303 is configured to reciprocate and seal with the pump chamber 201 of the pump body 2, thereby adjusting the chamber volume by axial sliding of the piston sleeve 303 and the pump body 2. The first elastic body 101 is configured to push the pressure head 3 where the piston sleeve 303 is located back to the reset configuration. The one-way valve unit 102 is used to close the connecting joint 202 on the pump body 2 in the non-operation state and during the process of switching from the reset configuration to the compression configuration. Furthermore, the piston rod 202 is configured to apply a preset opening force to the one-way valve unit 102 during at least a portion of its stroke when transitioning from the compression configuration to the reset configuration. This causes the pressure head 3 to open the connection between the connecting connector 202 and the pump chamber 201 under the negative pressure created by the preset opening force and / or the increase in cavity volume during the transition from the compression configuration to the reset configuration. In this embodiment, the emulsion pump can be assembled simply by assembling the pump body 2, the pressure head 3, and the plastic spring 1, and installing a liquid inlet tube on the connecting connector 202. The assembly is simple, with few parts.

[0054] The specific structure of the emulsion pump in this embodiment will be further described below:

[0055] In this embodiment, the pump body 2 may specifically include a pump chamber section, a valve chamber section and a connecting joint 202 arranged sequentially along the axis. The pipe section of the pump chamber section is used to form the pump chamber 201 mentioned above. The valve chamber section may be configured to gradually shrink in the radial direction and eventually form a liquid replenishment port that connects the valve chamber and the connecting joint 202.

[0056] Furthermore, the pump body 2 of the emulsion pump is also provided with a connecting screw sleeve 203 for connecting an external emulsion bottle. Specifically, it is arranged around the outer ring surface of the pump cavity section. The connecting screw sleeve 203 is provided with an internal thread, so that it can be connected to the emulsion bottle by tightening the thread.

[0057] In this embodiment, to better apply a preset opening force without affecting the diameter of the piston rod 202, the piston rod 202 includes a connected outlet pipe body 3021 and a radially contracting section 3022. The small end of the radially contracting section 3022 is clamped and slidably connected to the piston rod 202, and the pipe section of the radially contracting section 3022 is provided with several axial through grooves communicating with the inner cavity of its pipe section. The axial through grooves can be configured to be open at the lower end, that is, the radially contracting section 3022 can specifically be several obliquely clamping pieces arranged circumferentially. One end of the obliquely clamping piece is connected to the lower end of the outlet pipe body 3021, and the other end is inclined inward. The plastic material of the obliquely clamping piece allows it to apply a certain clamping force to the axial extension member 1023 through its own deformation. In addition, the axial through grooves can also make the channel in the outlet pipe body 3021 communicate with the inside of the pump chamber 201, avoiding the situation where the axial extension member 1023 blocks the piston rod 202 and thus affects the pumping effect. Furthermore, a liquid inlet can also be provided on the liquid outlet pipe body 3021 to enable communication between the inner cavity of the liquid outlet pipe body 3021 and the pump chamber 201.

[0058] Correspondingly, the length of the axial guide arm corresponding to the second end ring 1013 can be set to be relatively long, so that both sets of axial guide arms can always be sleeved on the above-mentioned liquid outlet pipe body 3021.

[0059] In this embodiment, the outer ring surface of the piston sleeve 303 may be provided with a plurality of annular piston protrusions 3031 spaced apart along the axial direction, thereby cooperating with the inner wall surface of the pump cavity 201 to achieve a reciprocating sealing fit. Furthermore, a limiting protrusion for limiting the disengagement of the annular piston protrusions 3031 may be further provided on the inner wall surface corresponding to the opening of the pump cavity 201, thereby preventing the piston sleeve 303 from disengaging from the pump body 2 under the elastic force of the first elastic body 101. Additionally, an annular liquid accumulation recess may be formed on the inner wall surface of the pump cavity 201 below the limiting protrusion, thereby temporarily storing the material leaking from the first annular piston protrusion 3031 when the piston sleeve 303 is pressed down, preventing it from leaking out from the opening of the pump cavity 201.

[0060] The following describes the usage process of the emulsion pump in this embodiment:

[0061] During the rebound process from the compression configuration to the reset configuration, no external force is applied to the pressure head body 301. The pressure head body 301, piston sleeve 303, and piston rod 202 move upward under the action of the first elastic body 101. At this time, the volume of the cavity formed by the piston sleeve 303 and the pump chamber 201 increases, forming a negative pressure relative to the emulsion bottle and acting on the valve core 1021 of the one-way valve unit 102. At the same time, the radial contraction section 3022 of the piston rod 202 applies an upward frictional force (i.e., a preset opening force) to the axial extension 1023 connected to the valve core 1021 through the clamping force of the axial extension 1023 during the sliding process during the upward movement of the upward movement of the piston rod 202. The combination of these two forces causes the valve core 1021 of the one-way valve unit 102 to open. The material in the emulsion bottle is connected to the pump chamber 201 through the liquid inlet tube and is sucked into the pump chamber 201 for filling under the action of the negative pressure in the pump chamber 201.

[0062] During the downward pressure process of transitioning from the reset configuration to the compression configuration, the operator presses down the pressure head body 301, and the piston sleeve 303 is pressed down, which reduces the volume of the cavity formed by the piston sleeve 303 and the pump chamber 201 and creates positive pressure. At this time, the one-way valve unit 102 is closed, and the material cannot flow out from the connecting joint 202. As a result, the material in the pump chamber 201 can enter from the liquid inlet on the liquid outlet body 3021 and / or the axial through groove on the radial contraction section 3022 under the action of positive pressure, and is finally squeezed out from the liquid outlet channel in the pressure head body 301.

[0063] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A plastic spring for an emulsion pump, characterized in that, For mounting into the pump chamber of an emulsion pump, including: A first elastic body includes a first end ring, an intermediate elastic element, and a second end ring connected in sequence; the first end ring is configured to be fitted into a piston component inside a pump chamber, the second end ring is configured to be fitted into the bottom surface of the pump chamber, and the intermediate elastic element is configured to avoid being located on the piston rod of the emulsion pump. It also includes a one-way valve unit connected to the second end ring, the one-way valve unit being configured to prevent material in the pump chamber from leaking out of the replenishment port on the pump chamber, and the one-way valve unit having an axial extension for sliding connection to the piston rod.

2. The plastic spring for an emulsion pump as described in claim 1, characterized in that, Both the first end ring and the second end ring are provided with a central through hole for the piston rod to pass through, and both the first end ring and the second end ring are provided with an axial guide sleeve for fitting and guiding the piston rod to slide.

3. The plastic spring for an emulsion pump as described in claim 2, characterized in that, The first end ring is provided with two symmetrically arranged sliding guide grooves, which are configured to cooperate with the internal structure of the pump cavity to limit the circumferential rotation of the first end ring.

4. The plastic spring for an emulsion pump as described in claim 1, characterized in that, The second end side plate has several limiting ribs on the surface facing the bottom of the pump cavity. The limiting ribs are configured to cooperate with the bottom structure of the valve cavity to limit the circumferential rotation of the second end side ring.

5. The plastic spring for an emulsion pump as described in claim 1, characterized in that, The intermediate elastic element includes a first sub-elastic element, an intermediate connecting ring, and a second sub-elastic element that are connected sequentially along the axial direction. Both the first and second sub-elastic elements include two arc-shaped elastic sheets arranged symmetrically with respect to the axial direction.

6. The plastic spring for an emulsion pump as described in claim 1, characterized in that, The one-way valve unit includes a valve core and a second elastic body; The two ends of the second elastic body are respectively connected to the valve core and the intermediate elastic element. The second elastic body is configured to apply elastic force to push the valve core to close the liquid inlet in the absence of external force.

7. The plastic spring for an emulsion pump as described in claim 6, characterized in that, The axial extension is inserted through the second elastic body, and the first end of the axial extension is connected to the valve core, and the diameter of the second end of the axial extension gradually decreases.

8. The plastic spring for an emulsion pump as described in claim 6, characterized in that, The sealing surface of the valve core is hemispherical, and the second elastic body is spring-shaped.

9. The plastic spring for an emulsion pump as described in claim 1, characterized in that, The first end ring, the intermediate elastic element, the second end ring, the one-way valve unit, and the axial extension element are integrally formed.

10. An emulsion pump, characterized in that, Includes a pump body, a pressure head, and a plastic spring as described in any one of claims 1 to 9; The pump body is configured to have a pump chamber with an upward opening, and the bottom surface of the pump chamber is provided with a connecting connector for connecting a liquid inlet tube, the channel of the connecting connector being the liquid replenishment port; The pressure head is configured to switch between a reset configuration and a compression configuration relative to the pump body; the pressure head includes a pressure head body and a piston rod and a piston sleeve connected to the pressure head body; the piston rod communicates with the liquid outlet channel of the pressure head body and extends into the pump chamber; the piston sleeve is fitted onto the piston rod, and the piston sleeve is reciprocatingly sealed and connected to the pump chamber; The intermediate elastic element is configured to apply an elastic force to at least a portion of the pressure head via a first end side to push the pressure head to the reset configuration in the absence of external force. Wherein, during at least a portion of the stroke in which the pressure head transitions from the compression configuration to the reset configuration, the piston rod is configured to apply a preset opening force to the axial extension; the one-way valve unit is configured to open the replenishment port under the action of negative pressure in the pump chamber and / or the preset opening force.

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