Liquid Pumps

Abstract

A liquid pump includes a movable unit and a fixed unit. The movable unit can move relative to the fixed unit to pump out a product. An elastic mechanism is provided between the movable unit and the fixed unit. The elastic mechanism includes at least one elastic strip. The elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product. The liquid pump also includes an elastic mechanism adjustment member. The elastic mechanism adjustment member can move between a first position and a second position. In the first position, the elastic strip of the elastic mechanism is in a relaxed state, and in the second position, the elastic strip of the elastic mechanism is in a preloaded state. By providing the elastic mechanism adjustment member, it is convenient to press down the pressure head during use, and it is also possible to prevent the elastic strip from yielding and deforming due to long-term force.

Description

Technical Field

[0001] The present invention relates to a liquid pump, wherein the so-called "liquid" includes flowing or semi-flowing products in liquid, semi-liquid and the like state. Background Art

[0002] In the field of toiletries, for example, the container used usually includes a liquid pump for dispensing the product in the container. The user applies pressure to the actuator on the liquid pump to pump the product. After pumping the product once, a reset mechanism installed on the liquid pump restores the actuator to its unpressed position, that is, resets the actuator to prepare for the next pumping.

[0003] At present, there are usually the following types of reset mechanisms for liquid pumps on the market:

[0004] One type of reset mechanism is a plastic spring in the form of a bellows. Fig.28 As shown, a bellows-shaped spring 1300 is provided between the pressure head 1100 of the liquid pump 1000 and the tooth cap 1200. When the product is to be dispensed, the pressure head 1100 is pressed to make the pressure head 1100 move downward against the spring force of the spring 1300. After the product is dispensed, the pressure on the pressure head 1100 is removed, so that the pressure head 1100 moves upward under the action of the spring force of the spring 1300 and returns to the initial position.

[0005] One problem with this bellows-shaped plastic spring 1300 is that the spring force is insufficient. If the product to be pumped is relatively viscous or the pumping volume is relatively large, the spring head 1100 will have difficulty in rebounding or may even fail to rebound due to insufficient spring force. This will affect the continued use of the product container. In response to this problem, in order to allow the pressure head of the liquid pump to rebound into place after use, the current common practice is to preload the bellows spring before use so that it undergoes a certain pre-compression deformation. However, this will cause other problems. For example, if the bellows spring is always in a pre-loaded state, it will yield over time, causing the pre-compression deformation caused by the original pre-load to disappear. In this way, after long-term storage or use, the problem of failure to rebound into place will still occur.

[0006] Another type of reset mechanism is a sleeve-type spring. Fig.29 As shown, a sleeve spring 2300 is formed on the pressure head 2100 of the liquid pump 2000, the lower end of the sleeve spring 2300 abuts against the toothed cap 2200, and is provided with a plurality of longitudinal slits, so that an elastic strip is formed between adjacent slits. When the pressure head 2100 is pressed down, the elastic strip is compressed and bent, and when the pressure is removed, the elastic strip returns to a vertical unstressed state under the action of its elastic force, so that the pressure head 2100 rebounds.

[0007] One problem with this sleeve-type spring 2300 is that when the pressure head 2100 is near the top dead center, a great amount of downward force is required to press the pressure head 2100 downward, and some users may not be able to press it down. When the pressure head 2100 reaches the bottom dead center of its stroke, the elastic strip of the spring 2300 may be excessively deformed, resulting in a smaller rebound force, causing the pressure head to rebound slowly and sometimes unable to fully reset, affecting the next use.

[0008] Therefore, there is a need for an improved liquid pump which can overcome the technical problems in the prior art described above. Summary of the invention

[0009] The present invention is made based on the technical problems of the prior art mentioned above, and its purpose is to provide a liquid pump with an improved structure, in which a large downward force is not required to press down the pressure head of the liquid pump, and the elastic strip can be prevented from yielding and deforming due to long-term stress.

[0010] The liquid pump of the present invention includes a movable unit and a fixed unit. The movable unit can move relative to the fixed unit to pump out the product. An elastic mechanism is arranged between the movable unit and the fixed unit. The elastic mechanism includes at least one elastic strip. The elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product. The liquid pump also includes an elastic mechanism adjusting member. The elastic mechanism adjusting member is formed on the elastic mechanism or connected to the elastic mechanism, and the elastic mechanism adjusting member can move between a first position and a second position. In the first position, the elastic strip of the elastic mechanism is in a relaxed state, and in the second position, the elastic strip of the elastic mechanism is in a preloaded state.

[0011] With the above liquid pump of the present invention, when not in use, the elastic strip of the elastic mechanism is in a relaxed state, and when in use, the elastic strip can be preloaded. In this way, there is no need to apply too much pressure to press the pressure head during use, and at the same time, it can prevent the elastic strip from yielding and deforming due to long-term pressure when not in use, which can cause the liquid pump to fail.

[0012] In the present invention, the elastic mechanism is made of a non-metallic material having elasticity. For example, the material used to make the elastic mechanism can be elastic plastic, rubber, etc.

[0013] One type of liquid pump is a press-type liquid pump, in which the movable unit includes a pressure head and a piston rod connected to the pressure head; and the fixed unit includes a socket and a cylinder connected to the socket.

[0014] For a push-type liquid pump, the specific structure of the elastic mechanism adjusting member therein can adopt the following implementation methods.

[0015] In the first embodiment, the elastic mechanism includes an upper base and a lower base, the upper base can be rotatably abutted against the pressure head, and the lower base can be rotatably abutted against the braces; the elastic mechanism adjusting member includes a lower base, wherein the lower surface of the lower base is formed with a convex supporting surface and a concave supporting surface, and a protrusion is formed on the braces, when the elastic mechanism adjusting member is in the first position, the concave supporting surface cooperates with the protrusion, and when the elastic mechanism adjusting member is in the second position, the convex supporting surface cooperates with the protrusion; and a paddle is formed on the lower base, and the rotation of the elastic mechanism adjusting member between the first position and the second position is achieved by operating the paddle.

[0016] Alternatively, the elastic mechanism adjusting member may also include an upper base, wherein a convex supporting surface and a concave supporting surface are formed on the upper surface of the upper base, and a protrusion is formed at the lower part of the pressure head, when the elastic mechanism adjusting member is in the first position, the concave supporting surface cooperates with the protrusion, and when the elastic mechanism adjusting member is in the second position, the convex supporting surface cooperates with the protrusion; and a paddle is formed on the upper base, and the rotation of the elastic mechanism adjusting member between the first position and the second position is achieved by operating the paddle.

[0017] In the second embodiment, the elastic mechanism includes a lower base, and a convex supporting surface and a concave supporting surface are formed on the lower surface of the lower base; the elastic mechanism adjusting member includes a lower base and a relaxing ring, the relaxing ring is located between the lower base and the braces, and a protrusion is formed on the relaxing ring, when the elastic mechanism adjusting member is in the first position, the protrusion cooperates with the concave supporting surface, and when the elastic mechanism adjusting member is in the second position, the protrusion contacts with the convex supporting surface; the relaxing ring is also formed with at least one paddle, and the rotation of the elastic mechanism adjusting member between the first position and the second position is achieved by operating the paddle.

[0018] Alternatively, the elastic mechanism may include an upper base, on the upper surface of which a convex supporting surface and a concave supporting surface are formed; the elastic mechanism adjusting member includes an upper base and a release ring, the release ring is located between the upper base and the pressure head, and a protrusion is formed on the release ring, when the elastic mechanism adjusting member is in the first position, the protrusion cooperates with the concave supporting surface, and when the elastic mechanism adjusting member is in the second position, the protrusion contacts with the convex supporting surface; the release ring is also formed with at least one paddle, and the rotation of the elastic mechanism adjusting member between the first position and the second position is achieved by operating the paddle.

[0019] In a third embodiment, the elastic mechanism includes a lower base, and the elastic mechanism adjustment member includes a push plate arranged between the lower base and the braces, the push plate includes: two end plates located at both ends and a side plate extending between the end plates, the upper surface of the side plate is formed in a step shape, including an upper step surface and a lower step surface, and the push plate can move linearly between a first position and a second position, in the first position, the lower step surface contacts the support surface of the lower base, and in the second position, the upper step surface contacts the support surface of the lower base.

[0020] Furthermore, a transition surface is provided between the upper step surface and the lower step surface of the push plate, and the transition surface is an inclined surface or a curved surface.

[0021] Preferably, the elastic mechanism adjusting member automatically realizes movement between the first position and the second position. For example:

[0022] In a fourth embodiment, the elastic mechanism adjusting member includes a sleeve formed on the elastic mechanism, and at least one protrusion is formed on the inner surface of the sleeve; a guide groove is formed on the upper sleeve of the braces, and the protrusion is accommodated in the guide groove, and the guide groove includes an inclined portion at the upper part and a vertical portion at the lower part; and the elastic mechanism includes an upper base, and a convex platform and a concave platform are formed on the upper surface of the upper base; a pressure head protrusion is formed at the lower part of the pressure head; wherein, when the pressure head is located at the top dead center position of its stroke, the sleeve is located at the first position, and the concave platform of the upper base contacts the pressure head protrusion; by pressing down the pressure head, the protrusion interacts with the inclined portion of the guide groove, so that the sleeve rotates from the first position to the second position, and when the protrusion enters the vertical portion, the sleeve rotates to the second position, so that the convex platform of the upper base contacts the pressure head protrusion.

[0023] In a fifth embodiment, the elastic mechanism adjusting member includes a push plate arranged between the elastic mechanism and the pressure head, the push plate includes a plate body and a first cantilever and a second cantilever suspended downward from the plate body, the lower surface of the plate body is formed in a step shape, including an upper step surface and a lower step surface; and the upper sleeve of the braces is provided with: a first guide wedge block, the first guide wedge block corresponds to the first cantilever and has an upward inclined surface; and a second guide wedge block, the second guide wedge block corresponds to the second cantilever and has a downward inclined surface; wherein, when the pressure head is at the top dead center of the stroke, The push plate is in a first position, in which the lower step surface of the push plate contacts the upper base of the elastic mechanism to put the elastic strip in a relaxed state; as the pressure head moves downward, the first cantilever contacts and interacts with the first guide wedge block to move the push plate from the first position to the second position, in which the upper step surface of the push plate contacts the upper base of the elastic mechanism to put the elastic strip in a preloaded state; and as the pressure head moves upward, the second cantilever contacts and interacts with the second guide wedge block to return the push plate from the second position to the first position.

[0024] Preferably, a pawl is formed on the free end of the first cantilever and / or the second cantilever, and the pawl interacts with the first guide wedge and / or the second guide wedge.

[0025] In the sixth embodiment, the elastic mechanism adjustment member includes a push plate arranged between the lower base of the elastic mechanism and the braces, the upper surface of the push plate includes an upper step surface and a lower step surface; and formed on the piston rod: a first guide wedge block, the first guide wedge block includes a downward-facing inclined surface; and a second guide wedge block, the second guide wedge block includes an upward-facing inclined surface; wherein, when the ram is at the top dead center of the stroke, the push plate is in a first position, in the first position, the lower step surface of the push plate contacts the lower base, so that the elastic strip is in a relaxed state, as the ram moves downward, the first guide wedge block contacts and interacts with the push plate, so that the push plate moves from the first position to the second position, in the second position, the upper step surface of the push plate contacts the lower base, so that the elastic strip is preloaded; and as the ram moves upward, the second guide wedge block contacts and interacts with the push plate, so that the push plate returns from the second position to the first position.

[0026] Preferably, a convex portion is formed on the lower surface of the lower base, and the convex portion contacts the upper step surface or the lower step surface of the push plate. In this way, the friction resistance between the lower base and the push plate can be reduced, and the movement of the push plate between the first position and the second position is facilitated.

[0027] The elastic mechanism may also be arranged below the mouthpiece, such as inside the cylinder. For example, in the seventh embodiment, the liquid pump is a push-type liquid pump, the movable unit includes a pressure head, the pressure head includes a lower sleeve; the fixed unit includes: a mouthpiece; a cylinder, the cylinder is connected to the mouthpiece, a convex shoulder is formed in the cylinder; and a piston rod, the piston rod is fixed in the cylinder; and the elastic mechanism includes an upper base and a lower base, the lower base rests on the convex shoulder, and a relaxation ring is provided between the upper base and the lower end of the lower sleeve of the pressure head; a convex bearing surface and a concave bearing surface are formed on the lower surface of the relaxation ring, wherein, when the relaxation ring is in the first position, the concave bearing surface is in contact with the upper base. When the release ring is in the second position, the convex supporting surface contacts the upper base, and the elastic strip is in a relaxed state. When the release ring is in the second position, the convex supporting surface contacts the upper base, and the elastic strip is in a preloaded state. wherein, at least one groove is formed on the inner surface of the release ring, and at least one guide ridge is formed on the piston rod, the guide ridge comprises an upper inclined portion and a lower vertical portion, the groove is fitted on the guide ridge, and when the groove is fitted with the inclined portion, the downward movement of the pressure head causes the release ring to rotate from the first position to the second position, and the upward movement of the pressure head causes the release ring to rotate from the second position back to the first position.

[0028] Alternatively, the positions of the convex strips and the concave grooves may be interchanged. For example, at least one convex block is formed on the inner surface of the release ring, and at least one guide groove is formed on the piston rod, the guide groove includes an upper inclined portion and a lower vertical portion, the convex block fits in the guide groove, and when the convex block fits with the inclined portion, the downward movement of the pressure head causes the release ring to rotate from the first position to the second position, and the upward movement of the pressure head causes the release ring to rotate from the second position back to the first position.

[0029] The elastic strip can also be relaxed by tilting the elastic strip relative to the longitudinal axis of the liquid pump. For example, the elastic mechanism includes an upper base, and the elastic mechanism adjustment member includes at least the upper base, wherein the upper base can move linearly between a first position and a second position, when the upper base is in the first position, the distance between the two ends of the elastic strip is L1, and when the upper base is in the second position, the distance between the two ends of the elastic strip is L2, wherein L1>L2.

[0030] Alternatively, the lower base of the elastic mechanism may be used as a linearly movable component, that is, the elastic mechanism adjusting member at least includes a lower base, wherein the lower base can move linearly between a first position and a second position, and when the lower base is in the first position, the distance between the two ends of the elastic strip is L1, and when the lower base is in the second position, the distance between the two ends of the elastic strip is L2, wherein L1>L2.

[0031] The liquid pump can also be a spray gun type liquid pump, wherein the fixed unit includes a cylinder, the movable unit includes a piston rod, the piston rod is movably mounted in the cylinder, and an actuating component is arranged on the piston rod for actuating the piston rod to move relative to the cylinder; the elastic mechanism includes an elastic strip, the first end of the elastic strip is fixed on the piston rod, and the second end of the elastic strip is fixed on the fixed unit, wherein the elastic mechanism adjustment member includes a relaxation plate mounted on the piston rod, the relaxation plate abuts against the first end of the elastic strip, a convex surface and a concave surface are formed on the surface of the relaxation plate facing the elastic mechanism, and the relaxation plate can rotate between a first position and a second position, in the first position, the concave surface contacts the first end of the relaxation plate, so that the elastic strip is in a relaxed state, and in the second position, the convex surface contacts the first end of the relaxation plate, so that the elastic strip is in a preloaded state.

[0032] The actuating component is a pivot trigger, or the actuating component is a pressing portion coaxially mounted on the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1a It is a front view of the liquid pump according to the first embodiment of the present invention.

[0034] Figure 1b is along Figure 1a A cross-sectional view of the liquid pump taken along line AA in FIG. 1 , wherein the liquid pump is in a non-pressurized state.

[0035] Figure 1c yes Figure 1a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0036] Figure 2a It is a perspective view of the elastic mechanism in the liquid pump of the first embodiment.

[0037] Figure 2byes Figure 2a A cross-sectional view of the elastic mechanism shown.

[0038] Figure 3a It is a perspective view of the mouthpiece in the liquid pump of the first embodiment.

[0039] Figure 3b yes Figure 3a Top view of the braces shown.

[0040] Figure 3c is along Figure 3b The cross-sectional view is obtained along line BB.

[0041] Figure 4a It is a perspective view of a liquid pump according to a second embodiment of the present invention.

[0042] Figure 4b yes Figure 4a A cross-sectional view of a liquid pump shown in which the liquid pump is in an unpressurized state.

[0043] Figure 4c yes Figure 4a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0044] Figure 5a It is a perspective view of the elastic mechanism in the liquid pump of the second embodiment.

[0045] Figure 5b yes Figure 5a A cross-sectional view of the elastic mechanism shown.

[0046] Figure 6a It is a perspective view of a relaxation ring in the liquid pump according to the second embodiment.

[0047] Figure 6b yes Figure 6a Bottom view of the release ring shown.

[0048] Figure 6c yes Figure 6a Side view of the relaxation ring shown.

[0049] Figure 7a It is a perspective view of a liquid pump according to a third embodiment of the present invention.

[0050] Figure 7b yes Figure 7a A cross-sectional view of a liquid pump shown in which the liquid pump is in an unpressurized state.

[0051] Figure 7c yes Figure 7a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0052] Figure 8aIt is a perspective view of the elastic mechanism in the liquid pump of the third embodiment.

[0053] Figure 8b yes Figure 8a Front view of the elastic mechanism shown.

[0054] Figure 8c yes Figure 8a Side view of the elastic mechanism shown.

[0055] Figure 9a It is a perspective view of a push plate in the liquid pump according to the third embodiment.

[0056] Figure 9b yes Figure 9a A top view of the push plate is shown.

[0057] Fig.9c is along Figure 9b Cross-sectional view obtained along line CC.

[0058] Fig.10a It is a perspective view of a liquid pump according to a fourth embodiment of the present invention.

[0059] Fig.10b yes Fig.10a A cross-sectional view of a liquid pump shown in which the liquid pump is in an unpressurized state.

[0060] Fig.10c yes Fig.10a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0061] Fig.11a It is a three-dimensional view of the elastic mechanism in the liquid pump of the fourth embodiment, wherein a sleeve is provided on the elastic mechanism.

[0062] Fig.11b yes Fig.11a Front view of the elastic mechanism shown.

[0063] Fig.11c is along Fig.11b The cross-sectional view is obtained along line DD.

[0064] Fig.12a It is a perspective view of a mouthpiece of a liquid pump according to a fourth embodiment.

[0065] Figure 12b yes Fig.12a Front view of the braces shown.

[0066] Fig.13a It is a bottom perspective view of the pressure head of the liquid pump according to the fourth embodiment.

[0067] Fig.13b yes Fig.13a Cross-section of the indenter shown.

[0068] Fig.14a is a front view of a liquid pump according to a fifth embodiment of the present invention.

[0069] Fig.14b yes Fig.14a A cross-sectional view of a liquid pump shown in which the liquid pump is in an unpressurized state.

[0070] Fig.14c yes Fig.14a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0071] Fig.15a 1 is a top view of a push plate of a liquid pump according to a fifth embodiment.

[0072] Fig.15b yes Fig.15a Side view of the push plate shown.

[0073] Fig.15c is along Fig.15a The cross-sectional view is obtained along line EE.

[0074] Fig.16a 1 is a top view of a mouthpiece of a liquid pump according to a fifth embodiment.

[0075] Fig.16b is along Fig.16a Cross-sectional view obtained along line FF.

[0076] Fig.17a A sectional view showing a liquid pump according to a sixth embodiment of the present invention, wherein the liquid pump is in a non-pressurized state.

[0077] Fig.17b yes Fig.17a Another cross-sectional view of the liquid pump shown, wherein the liquid pump is in a depressed state.

[0078] Fig.18a 4 is a bottom view of the piston rod of the liquid pump according to the sixth embodiment.

[0079] Fig.18b is along Fig.18a The cross-sectional view is obtained along the line GG.

[0080] Fig.19a 1 is a top view of a push plate of a liquid pump according to a sixth embodiment.

[0081] Fig.19b is along Fig.19a The cross-sectional view is obtained along the line HH.

[0082] FIG. 20 a shows a cross-sectional view of a liquid pump according to a seventh embodiment of the present invention, wherein the liquid pump is in a non-pressurized state.

[0083] FIG. 20 b is another cross-sectional view of the liquid pump shown in FIG. 20 a , wherein the liquid pump is in a depressed state.

[0084] Fig.21a It is a perspective view of a piston rod of a liquid pump according to a seventh embodiment.

[0085] Figure 21b yes Fig.21a Front view of the piston rod shown.

[0086] Fig.21c yes Fig.21a Bottom view of the piston rod shown.

[0087] Fig.22a It is a bottom perspective view of a release ring of the liquid pump according to the seventh embodiment.

[0088] Figure 22b yes Fig.22a A top perspective view of the release ring is shown.

[0089] Fig.22c yes Fig.22a A top view of the relaxation ring is shown.

[0090] Fig.22d yes Fig.22a Side view of the relaxation ring shown.

[0091] Fig.23 is a side view of a liquid pump according to an eighth embodiment of the present invention.

[0092] Fig.24 It is a stereoscopic view of a release lever of a liquid pump according to an eighth embodiment.

[0093] Fig.25 A modified structure of the liquid pump of the eighth embodiment is shown.

[0094] Fig.26a is a side view of a liquid pump according to a ninth embodiment of the present invention, wherein the elastic strip is in a relaxed state.

[0095] Figure 26b 2 is another side view of the liquid pump according to the ninth embodiment, wherein the elastic strip is in a preloaded state.

[0096] Fig.27a It is a perspective view of the elastic mechanism of the liquid pump according to the ninth embodiment.

[0097] Figure 27b yes Fig.27a A cross-sectional view of the elastic mechanism shown.

[0098] Fig.27c yes Fig.27a A top view of the elastic mechanism shown.

[0099] Fig.28 A prior art liquid pump is shown.

[0100] Fig.29 Another prior art liquid pump is shown. DETAILED DESCRIPTION

[0101] To facilitate understanding of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features in the different embodiments described below can be combined arbitrarily without contradiction, and all of these fall within the scope of protection of the present invention.

[0102] It should be noted here that, unless otherwise specifically explained, the terms related to directions such as "upper" and "lower" used in this article are referred to the vertical orientation of the liquid pump in the use state.

[0103] <First Embodiment>

[0104] Figures 1a to 3c FIG. 1 shows a liquid pump 100 according to a first embodiment of the present invention. The liquid pump 100 is a press pump. Figure 1a 1 shows a front view of the liquid pump 100, Figure 1b Shown along Figure 1a A cross-sectional view taken along line AA in FIG. 1 , wherein the liquid pump 100 is in an unpressed state, Figure 1b 2 is a cross-sectional view of the liquid pump 100 in a pressed state.

[0105] like Figure 1a As shown, the liquid pump 100 in the form of a press pump includes a pressure head 110 and a toothed sleeve 120, and an elastic mechanism 130 is arranged between the pressure head 110 and the toothed sleeve 120. The elastic mechanism 130 is made of elastic non-metallic materials such as elastic plastics, rubber, etc. A piston rod 140 is connected below the pressure head 110, and a piston 160 is installed at the lower end of the piston rod 140. The toothed sleeve 120 is connected to the cylinder 150. The piston rod 140 passes through the opening at the upper end of the toothed sleeve 120 to enter the interior of the toothed sleeve 120 and extends into the cylinder 150.

[0106] When using the liquid pump 100, the user applies downward pressure to the pressure head 110, so that the pressure head 110 and the piston rod 140 connected to the pressure head 110 move downward to overcome the elastic force of the elastic mechanism 130, thereby pumping out the product liquid in the cylinder 150. After one pumping, the pressure applied to the pressure head 110 is removed, and the pressure head 110 and the piston rod 140 return upward to the standby position under the elastic force of the elastic mechanism 130. Thus, during the reciprocating movement of the pressure head 110, the product is pumped out.

[0107] In the present invention, the elastic mechanism 130 is made of an elastic material such as plastic and can be switched between a first position and a second position, wherein the elastic mechanism 130 is in an unloaded relaxed state and the elastic mechanism 130 is in a preloaded state.

[0108] Specifically, if Figure 2a and 2b As shown, the elastic mechanism 130 includes at least one, preferably two or more elastic strips 131. Preferably, in the unstressed state, the elastic strip 131 is arc-shaped, so that the downward force required at the top dead point of the stroke of the pressure head 110 is not too large.

[0109] An upper base 132 and a lower base 133 are connected to both ends of the elastic strip 131, and the upper base 132 and the lower base 133 are annular. In the installed state, the upper base 132 is sleeved on the lower sleeve of the pressure head 110 and can be relatively rotatable against the pressure head 110, and the lower base 133 is sleeved on the upper sleeve of the tooth brace 120 and can be relatively rotatable against the tooth brace 120, so that a biasing force is applied between the pressure head 110 and the tooth brace 120 to reset the pressure head 110 relative to the tooth brace 120.

[0110] The lower surface of the lower base 133 includes a convex support surface 134 and a concave support surface 135. Correspondingly, Figure 3a-3c As shown, at least one protrusion 121 (two protrusions are shown in the figure) is provided on the mouthpiece 120. When the elastic mechanism 130 is in the first position, the concave support surface 135 cooperates with the protrusion 121, and the distance between the upper base 132 and the lower base 133 is a larger H1, while in the second position, the convex support surface 134 contacts the protrusion 121, so that the distance between the upper base 132 and the lower base 133 is shortened to a smaller H2, and the elastic strip 131 of the elastic mechanism 130 is preloaded.

[0111] Furthermore, if Figure 2a and 2bAs shown, a paddle 136 is also provided on the elastic mechanism 130, for example, as shown in the figure, a paddle 136 is provided on the lower base 133. The user can operate the paddle 136 to rotate the elastic mechanism 130 between the first position and the second position, so that the elastic strip 131 of the elastic mechanism 130 is switched between the relaxed state and the preloaded state.

[0112] The operating principle of the liquid pump 100 of the above structure will be described below:

[0113] When the liquid pump 100 is not in use, the elastic mechanism 130 is in the above-mentioned first position. At this time, the concave supporting surface 135 of the lower base 133 of the elastic mechanism 130 is opposite to the protrusion 121 on the braces 120. At this time, the distance between the upper base 132 and the lower base 133 of the elastic mechanism 130 is large, so that the elastic strip 131 is in a relaxed state.

[0114] When the liquid pump 100 needs to be used, the paddle 136 is operated to transfer the elastic mechanism 130 from the first position to the second position relative to the pressure head 110 and / or the braces 120. At this time, the convex supporting surface 134 of the lower base 133 of the elastic mechanism 130 contacts the protrusion 121, causing the lower base 133 to rise, thereby shortening the distance between the upper base 132 and the lower base 133, and the elastic strip 131 is preloaded.

[0115] After use, the paddle 136 is operated to rotate the elastic mechanism 130 from the second position back to the first position, so that the elastic strip 131 returns from the preloaded state to the relaxed state.

[0116] In the liquid pump 100 of the above structure, when the liquid pump 100 is in use, the elastic strip 131 of the elastic mechanism 130 is in a preloaded state, and when the liquid pump 100 is not in use, the elastic strip 131 is in a relaxed state, thereby ensuring that the elastic mechanism 130 has sufficient elastic force when in use, and the relaxed state of the elastic strip 131 when not in use can prevent the elastic strip 131 from yielding and deforming due to long-term stress, thereby extending its service life.

[0117] In the above structure, the elastic strip 131 is relaxed and preloaded by the alternating cooperation and contact between the convex bearing surface 134 and the concave bearing surface 135 of the lower base 133 and the convex block 121 on the mouthpiece 120. As an alternative or additional structure, a convex bearing surface and a concave bearing surface may also be formed on the upper surface of the upper base 132, and a matching convex portion may be formed on the lower portion of the indenter 110.

[0118] <Second Embodiment>

[0119] Figures 4a to 6cA liquid pump 200 according to a second embodiment of the present invention is shown. In the following description of the second embodiment, for the sake of brevity, the features not included in the first embodiment are mainly described, and the same technical features as the first embodiment are not described in detail.

[0120] like Figures 4a to 4c As shown, the liquid pump 200 includes a pressure head 210 , a mouthpiece 220 and an elastic mechanism 230 .

[0121] like Figure 5a and 5b As shown, the elastic mechanism 230 includes an upper base 232, a lower base 233 and at least one elastic strip 231 connected between the upper base 232 and the lower base 233. The upper base 232 and the lower base 233 are annular. The lower surface of the lower base 233 of the elastic mechanism 230 includes a convex support surface 234 and a concave support surface 235.

[0122] The liquid pump 200 of the second embodiment is different from the liquid pump 100 of the first embodiment in that the liquid pump 200 further includes a release ring 240. Figure 6a-6c As shown, the release ring 240 includes an annular support seat 242, on which at least one paddle 241 (two paddles 241 are shown) is disposed. In addition, at least one, preferably two or more, protrusions 243 are formed on the surface of the support seat 242 facing the elastic mechanism 230.

[0123] Back to Figures 4a to 4c , the upper base 232 of the elastic mechanism 230 abuts against the pressure head 210, and a relaxing ring 240 is inserted between the lower base 233 of the elastic mechanism 230 and the tooth brace 220. The relaxing ring 240 can rotate between a first position and a second position. At the first position, the convex block 243 on the supporting seat 242 of the relaxing ring 240 corresponds to the concave supporting surface 235 on the lower base 233 of the elastic mechanism 230, so that the distance between the upper base 232 and the lower base 233 of the elastic mechanism 230 is large, and the elastic strip 231 is in a relaxed state, while at the second position, the convex block 243 on the supporting seat 242 of the relaxing ring 240 contacts the convex supporting surface 234 on the lower base 233 of the elastic mechanism 230, so that the lower base 233 rises, so that the distance between the upper base 232 and the lower base 233 of the elastic mechanism 230 is reduced, and the elastic strip 231 is preloaded.

[0124] Similar to the first embodiment, a convex supporting surface and a concave supporting surface may also be provided on the upper surface of the upper base 232 , and a release ring 240 may be provided between the upper base 232 and the pressure head 210 .

[0125] The operating principle of the liquid pump 200 of the above structure will be described below:

[0126] When the liquid pump 200 is not in use, the release ring 240 is in the first position, at which time the position of the protrusion 243 on the support seat 242 of the release ring 240 corresponds to the concave support surface 235 of the lower base 233 of the elastic mechanism 230, so that the elastic strip 231 is in a relaxed state.

[0127] When the liquid pump 200 needs to be used, the user can operate the paddle 241 of the release ring 240 to rotate the release ring 240 from the first position to the second position, so that the protrusion 243 of the release ring 240 contacts the convex supporting surface 234 on the lower base 233 of the elastic mechanism 230, thereby causing the lower base 233 to rise, thereby putting the elastic strip 231 in a preloaded state.

[0128] After using the liquid pump 200, the user operates the paddle 241 of the release ring 240 again to turn the release ring 240 from the second position back to the first position, so that the position of the protrusion 243 of the release ring 240 corresponds to the concave support surface 235 again, and the elastic strip 231 returns to the relaxed state.

[0129] <Third Embodiment>

[0130] Figures 7a to 9c A liquid pump 300 according to a third embodiment of the present invention is shown. In the following description of the third embodiment, for the sake of brevity, features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0131] like Figures 7a to 7c As shown, the liquid pump 300 includes a pressure head 310, a tooth sleeve 320 and an elastic mechanism 330. The elastic mechanism 330 includes an upper base 332, a lower base 333 and at least one elastic strip 331 connected between the upper base 332 and the lower base 333 (see Figures 8a to 8c ).

[0132] The difference between the liquid pump 300 of the third embodiment and the previous embodiments is that the upper base 332 abuts against the pressure head 310, and the push plate 340 inserted between the lower base 333 of the elastic mechanism 330 and the brace 320 is in the form of a pushing component.

[0133] like Figures 9a to 9c As shown, the push plate 340 in the form of a pushing component includes end plates 341 located at both ends and two side plates connected between the two end plates 341, so that the push plate 340 is formed into a rectangular ring shape, and the rectangular ring sleeve can be, for example, mounted on the upper sleeve of the braces 320.

[0134] The upper surface of the side plate is stepped, including an upper step surface 342 and a lower step surface 343, and there is an inclined transition surface 344 between the upper step surface 342 and the lower step surface 343. The push plate 340 can move linearly between a first position and a second position. At the first position, the support surface 334 on the lower surface of the lower base 333 of the elastic mechanism 330 contacts the lower step surface 343, so that the distance between the upper base 332 and the lower base 333 is large, and the elastic strip 331 of the elastic mechanism 330 is in a relaxed state. At the second position, the support surface 334 of the elastic mechanism 330 contacts the upper step surface 342, the distance between the upper base 332 and the lower base 333 of the elastic mechanism 330 is small, and the elastic strip 331 of the elastic mechanism 330 is in a preloaded state.

[0135] Preferably, convex parts 345 are formed on the inner sides of the two side plates, respectively, and the distance between the two convex parts 345 is smaller than the diameter of the upper sleeve 321 of the toothed brace 320. In this way, the convex parts 345 play a role of limiting. When the push plate 340 is in the first position or the second position, the convex part 345 is on one side of the upper sleeve 321 of the toothed brace 320 and does not contact the upper sleeve 321. When the push plate 340 is to be pushed from the first position to the second position or from the second position to the first position, the convex part 345 will contact the upper sleeve 321 to prevent the push plate 340 from further moving. At this time, it is necessary to apply a force greater than a predetermined value to deform the two side plates of the push plate 340 to allow the convex part 345 to pass over the upper sleeve 321. In this way, by providing the convex part 345, it is necessary to apply a force greater than a predetermined value to make the push plate 340 move linearly between the first position and the second position, thereby avoiding misoperation of the push plate 340.

[0136] In addition, preferably, a guide protrusion 335 is provided on the support surface 334 of the elastic mechanism 330. When the push plate 340 is in the first position, the guide protrusion 335 cooperates with the upper step surface 342. When the push plate 340 moves from the first position to the second position, the guide protrusion 335 guides the movement of the support surface 334 from the lower step surface 343 to the upper step surface 342.

[0137] The operating principle of the liquid pump 300 of the above structure will be described below:

[0138] When the liquid pump 300 is not in use, the push plate 340 is in the first position, at which time the lower step surface 343 on the side plate of the push plate 340 contacts the supporting surface 334 of the lower base 333 of the elastic mechanism 330, and the elastic strip 331 is in a relaxed state.

[0139] When the liquid pump 300 is to be used, the user pushes the end plate 341 on one end of the push plate 340 to make the push plate 340 move linearly from the first position to the second position. As a result, the support surface 334 of the elastic mechanism 330 contacts the upper step surface 342, so that the lower base 333 rises, shortening the distance between the upper base 332 and the lower base 333, so that the elastic strip 331 is in a preloaded state.

[0140] After the elastic mechanism 330 is used, the end plate 341 on the other end of the push plate 340 is pushed to make the push plate 340 move linearly and return to the first position from the second position. Like this, the bearing surface 334 of the elastic mechanism 330 contacts with the lower step surface 343, and returns to the relaxed state.

[0141] <Fourth Embodiment>

[0142] Figures 10a to 13b A liquid pump 400 according to a fourth embodiment of the present invention is shown. In the following description of the fourth embodiment, for the sake of brevity, features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0143] like Figures 10a to 10c As shown, the liquid pump 400 of the fourth embodiment includes a pressure head 410, a toothed sleeve 420, and an elastic mechanism 430 disposed between the pressure head 410 and the toothed sleeve 420. The fourth embodiment also includes a sleeve 440, which can be integrally or detachably formed on the elastic mechanism 430.

[0144] like Figures 11a to 11c The elastic mechanism 430 includes an upper base 432, a lower base 433 and at least one elastic strip 431 connected between the upper base 432 and the lower base 433. The upper surface of the upper base 432 includes a convex platform 435 and a concave platform 436. Correspondingly, a pressure head protrusion 411 (see Fig.13a and 13b ). The elastic mechanism 430 can rotate between a first position and a second position. In the first position, the concave platform 436 contacts the pressure head protrusion 411, so that the distance between the upper base 432 and the lower base 433 is large, and the elastic strip 431 is in a relaxed state, while in the second position, the convex platform 435 contacts the pressure head protrusion 411, so that the distance between the upper base 432 and the lower base 433 is small, and the elastic strip 431 is in a preloaded state.

[0145] In the fourth embodiment of the present invention, the elastic mechanism 430 can automatically switch from the first position to the second position when the user presses the pressure head 410. The structure of the automatic switching is as follows.

[0146] like Fig.11a and11c As shown, a sleeve 440 extending downward is formed on the upper base 432, and at least one protrusion 441 is formed inside the sleeve 440. Correspondingly, a guide groove 422 is formed on the upper sleeve 421 of the tooth brace 420, and the upper part of the guide groove 422 is an inclined groove, and the lower part is a vertical groove. In the installed state, the protrusion 441 is fitted in the guide groove 422. When the pressure head 410 is pressed down, the sleeve 440 formed on the upper base 432 also descends accordingly. When the protrusion 441 is in the inclined groove part of the guide groove 422, under the interaction between the protrusion 441 and the guide groove 422, the elastic mechanism 430 rotates from the first position to the second position. When the protrusion 441 enters the vertical groove part of the guide groove 422, the elastic mechanism 430 reaches the second position, so that the elastic mechanism 430 enters the preloaded state.

[0147] Preferably, a convex strip 434 is formed on the lower surface of the lower base 433 of the elastic mechanism 430 , and the convex strip 434 is in contact with the brace 420 , thereby reducing the resistance when the elastic mechanism 430 rotates relative to the brace 420 .

[0148] The operating principle of the liquid pump 400 of the above structure will be described below:

[0149] When the liquid pump 400 is not in use, the elastic mechanism 430 is in the first position, and the concave platform 436 of the upper base 432 of the elastic mechanism 430 contacts the pressure head protrusion 411 of the pressure head 410, so that the elastic strip 431 is in a relaxed state.

[0150] When the user uses the liquid pump 400, a downward pressing force is applied to the pressure head 410, so that the pressure head 410 moves downward, and the sleeve 440 also moves downward. At this time, the protrusion 441 in the sleeve 440 moves in the inclined groove part in the guide groove 422, so that the elastic mechanism 430 rotates from the first position to the second position.

[0151] Continue to press the pressure head 410 downward so that the protrusion 441 enters the vertical groove portion in the guide groove 422. At this time, the elastic mechanism 430 turns to the second position, and the convex platform 435 of the upper base 432 of the elastic mechanism 430 contacts the pressure head protrusion 411 of the pressure head 410, so that the elastic strip 431 is transformed into a preloaded state.

[0152] After use, the user removes the pressing force on the pressing head 410, and the pressing head 410 moves upward under the elastic force of the elastic strip 431 of the elastic mechanism 430. As the pressing head 410 moves upward, the protrusion 441 of the sleeve 440 moves from the vertical groove part of the guide groove 422 to the inclined groove part, and then, under the action between the guide groove 422 and the protrusion 441, the elastic mechanism 430 rotates from the second position back to the first position, so that the elastic strip 431 returns to the relaxed state.

[0153] <Fifth Embodiment>

[0154] Figures 14a to 16b A liquid pump 500 according to a fifth embodiment of the present invention is shown. In the following description of the fifth embodiment, for the sake of brevity, features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0155] like Figures 14a to 14c As shown, the liquid pump 500 includes a pressure head 510, a toothed brace 520, and an elastic mechanism 530 disposed between the pressure head 510 and the toothed brace 520. The liquid pump 500 of the fifth embodiment also includes a release push plate 540, which is arranged between the upper base 532 of the elastic mechanism 530. The lower base 533 of the elastic mechanism 530 abuts against the toothed brace 520.

[0156] Figures 15a to 15c The release push plate 540 is shown, wherein the release push plate 540 includes a plate body 541 in a rectangular ring shape and a cantilever 542 suspended downward from the plate body 541, for example Fig.15a In the structure shown, two cantilevers 542 are formed on the release push plate 540 and are arranged opposite to each other. Fig.15c As shown more clearly in the figure, the two side walls of the plate body 541 are respectively formed in a step shape, and its lower surface includes an upper step surface 543 and a lower step surface 544, and a transition surface 545 is between the upper step surface 543 and the lower step surface 544. The transition surface 545 is formed in the form of a slope in the figure, and of course, the transition surface 545 can also be formed as a curved surface.

[0157] The release push plate 540 can move linearly between the first position and the second position. When the release push plate 540 is in the first position, the lower step surface 544 contacts the upper base 532 of the elastic mechanism 530, so that the distance between the upper base 532 and the lower base 533 is large, and the elastic strip 531 of the elastic mechanism 530 is in a relaxed state, and when the release push plate 540 is in the second position, the upper step surface 543 contacts the upper base 532 of the elastic mechanism 530, so that the distance between the upper base 532 and the lower base 533 becomes small, thereby preloading the elastic strip 531.

[0158] The free ends of the two cantilevers 542 shown in the figure are respectively provided with protruding claws 546, and correspondingly, two guide wedges 521 corresponding to the two protruding claws 546 are provided on the toothed sleeve 520, for example, on the upper sleeve of the toothed sleeve 520. Fig.16a and Fig.16b As shown, of the two guide wedges 521 , one guide wedge 521 includes an upwardly facing inclined surface, and the other guide wedge 521 includes a downwardly facing inclined surface.

[0159] The operating principle of the liquid pump 500 of the above structure will be described in detail below:

[0160] When the liquid pump 500 is not in use, the release push plate 540 is in the first position, and the lower step surface 544 of the release push plate 540 contacts the upper base 532 of the elastic mechanism 530, so that the elastic strip 531 of the elastic mechanism 530 is in a relaxed state.

[0161] When using the liquid pump 500, the user applies downward pressure to the pressure head 510. As the pressure head 510 moves downward, the release push plate 540 also moves downward, and one of its cantilever arms 542 contacts the corresponding upwardly inclined guide wedge 521. For example, in the figure, the protruding claw 546 of the cantilever arm 542 contacts and interacts with the guide wedge 521. Under the action of the inclined surface of the guide wedge 521, the release push plate 540 moves linearly from the first position to the second position.

[0162] When the release push plate 540 moves to the second position, the upper step surface 543 of the release push plate 540 contacts the upper base 532 of the elastic mechanism 530, so that the elastic strip 531 is in a preloaded state.

[0163] After one pumping, the pressing force on the pressure head 510 is removed, and the pressure head 510 and the release push plate 540 move upward under the elastic action of the elastic strip 531. During the upward movement, the other cantilever 542 of the release push plate 540, such as its protruding claw 546, contacts and interacts with the corresponding other guide wedge 521 with the inclined surface downward. Under the action of the inclined surface of the other guide wedge 521, the release push plate 540 returns from the second position to the first position, so that the elastic strip 531 of the elastic mechanism 530 returns to the relaxed state.

[0164] Thus, the automatic switching of the release push plate 540 between the first position and the second position is achieved through the interaction between the release push plate 540 and the guide wedge 521 on the braces 520.

[0165] <Sixth Embodiment>

[0166] Figures 17a to 19b A liquid pump 600 according to a sixth embodiment of the present invention is shown. In the following description of the sixth embodiment, for the sake of brevity, features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0167] like Fig.17a and 17bAs shown, the liquid pump 600 includes a pressure head 610, a mouthpiece 620, and an elastic mechanism 630 disposed between the pressure head 610 and the mouthpiece 620. The elastic mechanism 630 includes an upper base 632, a lower base 633, and at least one elastic strip 631 connected between the upper base 632 and the lower base 633.

[0168] In the sixth embodiment, a loosening push plate 640 is provided between the lower base 633 of the elastic mechanism 630 and the mouthpiece 620 . Fig.19a and 19b The structure of the release push plate 640 is shown. The upper surface of the release push plate 640 is stepped, including an upper step surface 641 and a lower step surface 642, and a transition surface 643 in the form of an inclined surface is provided between the upper step surface 641 and the lower step surface 642. Of course, the transition surface 643 can also be a curved surface.

[0169] Correspondingly, a convex portion 634 is formed on the lower surface of the lower base 633, and the convex portion 634 contacts the upper step surface 641 or the lower step surface 642 of the release push plate 640. The release push plate 640 can move linearly between a first position and a second position. In the first position, the convex portion 634 contacts the lower step surface 642 of the release push plate 640, so that the distance between the upper base 632 and the lower base 633 of the elastic mechanism 630 is large, and the elastic strip 631 is in a relaxed state; in the second position, the convex portion 634 contacts the upper step surface 641 of the release push plate 640, so that the distance between the upper base 632 and the lower base 633 of the elastic mechanism 630 is reduced, thereby preloading the elastic strip 631.

[0170] A piston rod 650 is connected to the lower sleeve of the push plate 640. Fig.18a and 18b As shown, two oppositely disposed guide wedges 651 are formed on the piston rod 650, wherein one of the guide wedges 651 includes an upwardly facing inclined surface, and the other guide wedge 651 includes a downwardly facing inclined surface.

[0171] The operating principle of the liquid pump 600 of the above structure will be described in detail below:

[0172] When the liquid pump 600 is not in use, the release push plate 640 is in the first position, and the lower step surface 642 of the release push plate 640 contacts the convex portion 634 on the lower surface of the lower base 633 of the elastic mechanism 630, so that the elastic strip 631 is in a relaxed state.

[0173] During the use of the liquid pump 600, the user applies a downward pressing force to the pressure head 610, so that the piston rod 650 connected to the lower sleeve of the pressure head 610 also moves downward. During the downward movement of the piston rod 650, a guide wedge 651 including a downwardly facing inclined surface on the piston rod 650 contacts and interacts with the release push plate 640. Under the action of the guide wedge 651 including a downwardly facing inclined surface, the release push plate 640 moves linearly from the first position to the second position, so that the protrusion 634 of the elastic mechanism 630 contacts the upper step surface 641 of the push plate 640. As a result, the elastic strip 631 of the elastic mechanism 630 is transformed into a preloaded state.

[0174] After one pumping, the user removes the pressing force on the pressure head 610, and the pressure head 610 moves upward under the elastic force of the elastic mechanism 630. During the upward movement, another guide wedge 651 of the piston rod 650 including an upwardly facing inclined surface contacts and interacts with the release push plate 640. Under the action of the guide wedge 651 including an upwardly facing inclined surface, the release push plate 640 returns from the second position to the first position, so that the convex portion 634 of the elastic mechanism 630 contacts the lower step surface 642 of the release push plate 640. As a result, the elastic strip 631 of the elastic mechanism 630 returns to the relaxed state.

[0175] Therefore, in the sixth embodiment, the automatic switching of the release push plate 640 between the first position and the second position is achieved through the interaction between the release push plate 640 and the guide wedge 651 on the piston rod 650.

[0176] <Seventh Embodiment>

[0177] 20a to 22d show a liquid pump 700 according to a seventh embodiment of the present invention. In the following description of the seventh embodiment, for the sake of brevity, the features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0178] As shown in Figures 20a and 20b, the liquid pump 700 includes a pressure head 710, a toothed sleeve 720 and a cylinder 750. A piston rod 760 is fixed in the cylinder 750. The pressure head 710 includes a lower sleeve 711, an upper base 732 of an elastic mechanism 730 abuts against the lower end of the lower sleeve 711, and a lower base 733 of the elastic mechanism 730 abuts against a convex shoulder 751 in the cylinder 750, whereby the elastic mechanism 730 applies an upward biasing force to the pressure head 710.

[0179] In the seventh embodiment of the present invention, a release ring 740 is further provided between the lower end of the sleeve 711 of the pressure head 710 and the upper base 732 of the elastic mechanism 730. The release ring 740 is annular and has a structure of Figures 22a to 22d. A convex bearing surface 742 and a concave bearing surface 743 are formed on the lower surface of the release ring 740. Moreover, the release ring 740 can rotate between a first position and a second position. At the first position, the concave bearing surface 743 contacts the upper base 732 of the elastic mechanism 730, so that the distance between the upper base 732 and the lower base 733 is large, and the elastic strip 731 of the elastic mechanism 730 is in a relaxed state. At the second position, the convex bearing surface 742 contacts the upper base 732 of the elastic mechanism 730, so that the distance between the upper base 732 and the lower base 733 becomes small, thereby preloading the elastic strip 731 of the elastic mechanism 730.

[0180] The rotation of the release ring 740 between the first position and the second position can be achieved automatically. Figures 22a to 22d As shown in FIG. 1 , at least one, preferably two, mutually opposing grooves 741 are formed in the inner surface of the release ring 740. Corresponding to the grooves 741, at least one, preferably two, mutually opposing guide ridges 761 are formed on the piston rod 760, as shown in FIG. Figures 21a to 21c The guide ridge 761 includes an inclined portion at the top and a vertical portion at the bottom. In the installed state, the groove 741 of the release ring 740 matches the guide ridge 761 of the piston rod 760.

[0181] When the release ring 740 moves downward, the groove 741 first cooperates with the inclined part of the guide ridge 761, and under the action of the inclined part, it rotates from the first position to the second position. When the groove 741 enters and cooperates with the vertical part of the guide ridge 761, the release ring 740 reaches the second position and stops rotating.

[0182] Preferably, if Fig.22c As shown, a plurality of beads 744 (four are shown in the figure) are formed on the surface opposite to the lower end of the lower sleeve 711 of the release ring 740 and the pressure head 710. These beads 744 contact the lower end of the lower sleeve 711, thereby reducing the friction resistance encountered by the release ring 740 when it rotates.

[0183] It should be noted here that the structural settings of the grooves and convex strips described above are interchangeable, that is, a guide groove is formed on the piston rod 760, and a convex portion matching the shape of the guide groove is formed on the inner surface of the release plate 740. This structure is also within the scope of the present invention.

[0184] The operating principle of the liquid pump 700 of the above structure will be described in detail below:

[0185] When the liquid pump 700 is not in use, the pressure head 710 is at the top dead center of the stroke, and the release ring 740 is in its first position. At this time, the concave supporting surface 743 of the release ring 740 is in contact with the upper base 732 of the elastic mechanism 730, and the elastic strip 731 of the elastic mechanism 730 is in a relaxed state.

[0186] When using the liquid pump 700, the user applies a downward pressing force to the pressure head 710, causing the pressure head 710 to move downward, and the release ring 740 abutting against the lower end of the lower sleeve 711 of the pressure head 710 also moves downward. During the downward movement of the release ring 740, the groove 741 in the release ring 740 first matches with the inclined portion of the upper portion of the guide ridge 761 in the piston rod 760, and rotates from the first position to the second position under the action of the inclined portion of the guide ridge 761.

[0187] As the pressure head 710 is further pressed downward, the release ring 740 moves to a position where its groove 741 matches the vertical portion of the guide convex strip 761, and the release ring 740 rotates to the second position. At this time, the convex support surface 742 of the release ring 740 contacts the upper base 732 of the elastic mechanism 730, and the elastic strip 731 of the elastic mechanism 730 enters a preloaded state. Thereafter, continuing to press the pressure head 710 downward will not cause the release ring 740 to rotate further.

[0188] After one pumping, the user removes the pressing force applied to the pressure head 710, and the pressure head 710 returns to its upper dead center under the elastic force of the elastic mechanism 730, and the release ring 740 also moves upward. When the release ring 740 moves to a position where its groove 741 matches the inclined portion of the guide convex strip 761, under the action of the inclined portion, the release ring 740 starts to rotate from the second position to the first position. When the pressure head 710 reaches its upper dead center, the release ring 740 also reaches its first position, so that the concave support surface 743 of the release ring 740 contacts the upper base 732 of the elastic mechanism 730, so that the elastic strip 731 of the elastic mechanism 730 returns to its relaxed state.

[0189] <Eighth Embodiment>

[0190] Figures 23 to 25 The eighth embodiment of the present invention shows a liquid pump 800 and a liquid pump 800' of a modified structure. In the following description of the eighth embodiment, for the sake of simplicity, the features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0191] First, unlike the previous embodiments, Figures 23 to 25 The liquid pumps 800 and 800' shown are spray gun type liquid pumps. Fig.23As shown, the liquid pump 800 has a cylinder 850 and a piston rod 840, and the piston rod 840 can move in the cylinder 850. A pivot trigger 810 is provided on the piston rod 840 for actuating the piston rod 840. When the user applies a pressing force on the pivot trigger 810, the pivot trigger 810 pivots, thereby causing the piston rod 840 to move relative to the cylinder 850, thereby pumping out the product.

[0192] The liquid pump 800 further includes an elastic mechanism 820, such as Fig.23 As shown, the elastic mechanism 820 includes an elastic strip 821 , a first end 822 of which is fixed to the piston rod 840 , and a second end 823 of which is fixed to the cylinder 850 or other fixed components of the liquid pump 800 , thereby applying a biasing force to the piston rod 840 to reset it relative to the cylinder 850 .

[0193] The eighth embodiment of the present invention further comprises a release plate 830 , which is rotatably sleeved on the piston rod 840 and abuts against the first end 822 of the elastic mechanism 820 .

[0194] Fig.24 The structure of the release plate 830 is shown, wherein the release plate 830 includes a body, a convex surface 831 and a concave surface 832 are formed on the surface of the body facing the elastic mechanism 820, and a paddle 833 is also formed on the body of the release plate 830. By operating the paddle 833, the release plate 830 can be rotated between a first position and a second position. In the first position, when the concave surface 832 of the release plate 830 contacts the first end 822 of the elastic mechanism 820, the distance between the two ends of the elastic strip 821 is large, so that the elastic strip 821 is in a relaxed state, and in the second position, the convex surface 831 of the release plate 830 contacts the first end 822 of the elastic mechanism 820, so that the distance between the two ends of the elastic strip 821 is reduced, so that the elastic strip 821 is preloaded.

[0195] The operating principle of the liquid pump 800 of the above structure will be described in detail below:

[0196] When the liquid pump 800 is not in use, the release plate 830 is in the first position, and the concave surface 832 thereof contacts the first end 822 of the elastic strip 821 of the elastic mechanism 820, so that the elastic strip 821 is in a relaxed state.

[0197] When the liquid pump 800 is needed, the paddle 833 of the release plate 830 is operated to rotate the release plate 830 from the first position to the second position. At this time, the convex surface 831 of the release plate 830 contacts the first end 822 of the elastic strip 821, thereby preloading the elastic strip 821.

[0198] After use, the paddle 833 is operated to rotate the release plate 830 back to the first position, so that the elastic strip 821 of the elastic mechanism 820 returns to the relaxed state.

[0199] Fig.25 The liquid pump 800' of the modified structure of the eighth embodiment shown in FIG. Fig.23 The structure of the liquid pump 800 shown is basically similar, that is, the liquid pump 800' comprises a piston rod 840', a cylinder 850', an elastic mechanism 820' for applying a biasing force to the piston rod 840', and a release plate 830' for adjusting the elastic mechanism 820'.

[0200] Unlike the liquid pump 800, the actuating mechanism of the liquid pump 800' is a pressing portion 810' coaxially mounted on the piston rod 840'. The pressing portion 810' makes the pressing force applied to the piston rod 840' consistent with the movement direction of the piston rod 840', so that the pressing force can be used more effectively.

[0201] <Ninth Embodiment>

[0202] Figures 26a to 27c A liquid pump 900 according to a ninth embodiment of the present invention is shown. In the following description of the ninth embodiment, for the sake of brevity, features not included in the previous embodiments are mainly described, and the same technical features as the previous embodiments are not described in detail.

[0203] like Fig.26a and 26b As shown, the liquid pump 900 includes a pressure head 910 and a mouthpiece 920 , and an elastic mechanism 930 is disposed between the pressure head 910 and the mouthpiece 920 to apply an upward biasing force to the pressure head 910 .

[0204] like Figures 27a to 27c As shown, the elastic mechanism 930 includes an upper base 932, a lower base 933, and an elastic strip 931 connected between the upper base 932 and the lower base 933. One of the upper base 932 and the lower base 933 can move between a first position and a second position.

[0205] exist Fig.26a and 26b In the illustrated structure, the upper base 932 is movable between a first position and a second position, wherein Fig.26a In the first position shown, the line between the two ends of the elastic strip 931 is inclined, for example, at an acute angle, relative to the longitudinal axis of the liquid pump 900. Thus, in the first position, the distance L1 between the two ends of the elastic strip 931 is large, so that the elastic strip 931 is in a relaxed state.

[0206] like Figure 26bAs shown, in the second position of the upper base 932, the line between the two ends of the elastic strip 931 is substantially parallel to the longitudinal axis of the liquid pump 900, so that the distance L2 between the two ends of the elastic strip 931 is smaller than the distance L1 in the first position, thereby preloading the elastic strip 931.

[0207] Here, in the second position, the line between the two ends of the elastic strip 931 may not be parallel to the longitudinal axis of the liquid pump 900, as long as the angle between the line between the two ends of the elastic strip 931 and the longitudinal axis of the liquid pump 900 is smaller than the angle between the line between the two ends of the elastic strip 931 and the longitudinal axis of the liquid pump 900 in the first position, the above-mentioned L2 can be smaller than L1, so that in the second position, the elastic strip 931 is in a preloaded state.

[0208] In addition, in the ninth embodiment, the lower base 933 may be movable between the first position and the second position.

[0209] The operating principle of the liquid pump 900 of the above structure will be described in detail below:

[0210] When the liquid pump 900 is not in use, the upper base 932 of the elastic mechanism 930 is in the first position, so that the distance between the two ends of the elastic strip 931 of the elastic mechanism 930 is large, and the elastic strip 931 is in a relaxed state.

[0211] When the liquid pump 900 needs to be operated, the upper base 932 of the elastic mechanism 930 is pushed to move from the first position to the second position. When the upper base 932 moves to the second position, the distance between the two ends of the elastic strip 931 is reduced, so that the elastic strip 931 is preloaded.

[0212] After using the liquid pump 900, the user pushes the upper base 932 from the reverse direction to return the upper base 932 from the second position to the first position, thereby returning the elastic strip 931 to the relaxed state.

[0213] <Other variant structures>

[0214] The specific embodiments of the present invention are described in detail above. Based on these embodiments, modifications and variations that are obvious to those skilled in the art may be made, which are also within the protection scope of the present invention.

[0215] In the above embodiments, the elastic mechanism includes an upper base and a lower base. However, according to actual conditions, at least one of the upper base and the lower base may not be included, and the corresponding ends of the elastic strip may be directly connected to the pressure head or the braces.

[0216] In the structure of each embodiment shown in the figures, the elastic mechanism generally comprises two elastic strips. However, other number of elastic strips may also be provided as required, such as one, three or more, and these elastic strips may be arranged evenly spaced from each other or may be arranged unevenly at intervals.

[0217] In the structure shown in the figure, when the pressure head is pressed down, most of the elastic strips of the elastic mechanism are deformed radially outward. However, those skilled in the art will appreciate that, if space permits, the elastic strips are also configured to deform radially inward as the pressure head is pressed down.

Claims

1. A liquid pump, comprising a movable unit and a fixed unit, wherein the movable unit can move relative to the fixed unit to pump out a product, an elastic mechanism is provided between the movable unit and the fixed unit, the elastic mechanism comprises at least one elastic strip, the elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product, characterized in that: The liquid pump further comprises an elastic mechanism adjusting member, the elastic mechanism adjusting member being formed on the elastic mechanism or connected to the elastic mechanism, the elastic mechanism adjusting member being movable between a first position and a second position, in which the elastic strip of the elastic mechanism is in a relaxed state, and in which the elastic strip of the elastic mechanism is in a preloaded state; The liquid pump is a press-type liquid pump, the movable unit comprises a pressure head and a piston rod connected to the pressure head; the fixed unit comprises a toothed sleeve and a cylinder connected to the toothed sleeve; Wherein, the elastic mechanism includes a lower base, and the elastic mechanism adjustment member includes a push plate arranged between the lower base and the braces, the push plate includes: two end plates located at both ends and a side plate extending between the end plates, the upper surface of the side plate is formed in a step shape, including an upper step surface and a lower step surface, and the push plate can move linearly between the first position and the second position, in the first position, the lower step surface contacts the supporting surface of the lower base, and in the second position, the upper step surface contacts the supporting surface of the lower base.

2. The liquid pump according to claim 1, characterized in that The elastic mechanism is made of a non-metallic material with elasticity.

3. The liquid pump according to claim 1, characterized in that A transition surface is also included between the upper step surface and the lower step surface, and the transition surface is an inclined surface or a curved surface.

4. The liquid pump according to claim 1 or 2, characterized in that: The elastic mechanism includes an upper base, and the elastic mechanism adjustment member includes at least the upper base, wherein the upper base is capable of linearly moving between the first position and the second position, when the upper base is in the first position, the distance between the two ends of the elastic strip is L1, and when the upper base is in the second position, the distance between the two ends of the elastic strip is L2, wherein L1>L2.

5. The liquid pump according to claim 1 or 2, characterized in that: The lower base can move linearly between the first position and the second position. When the lower base is in the first position, the distance between the two ends of the elastic strip is L1. When the lower base is in the second position, the distance between the two ends of the elastic strip is L2, wherein L1>L2.

6. A liquid pump, comprising a movable unit and a fixed unit, wherein the movable unit can move relative to the fixed unit to pump out a product, an elastic mechanism is provided between the movable unit and the fixed unit, the elastic mechanism comprises at least one elastic strip, the elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product, characterized in that: The liquid pump further comprises an elastic mechanism adjusting member, the elastic mechanism adjusting member being formed on the elastic mechanism or connected to the elastic mechanism, the elastic mechanism adjusting member being movable between a first position and a second position, in which the elastic strip of the elastic mechanism is in a relaxed state, and in which the elastic strip of the elastic mechanism is in a preloaded state; The liquid pump is a press-type liquid pump, the movable unit comprises a pressure head and a piston rod connected to the pressure head; the fixed unit comprises a toothed sleeve and a cylinder connected to the toothed sleeve; The elastic mechanism adjustment member automatically realizes movement between the first position and the second position; Wherein, the elastic mechanism adjusting member comprises a sleeve formed on the elastic mechanism, and at least one protrusion is formed on the inner surface of the sleeve; A guide groove is formed on the upper sleeve of the mouthpiece, the projection is received in the guide groove, and the guide groove includes an inclined portion at the upper portion and a vertical portion at the lower portion; and The elastic mechanism comprises an upper base, and a convex platform and a concave platform are formed on the upper surface of the upper base; a pressing head convex block is formed at the lower part of the pressing head; Among them, when the ram is at the top dead center position of its stroke, the sleeve is at the first position, and the concave platform of the upper base is in contact with the ram protrusion; by pressing down the ram, the protrusion interacts with the inclined part of the guide groove, so that the sleeve rotates from the first position to the second position, and when the protrusion enters the vertical part, the sleeve rotates to the second position, so that the convex platform of the upper base is in contact with the ram protrusion.

7. A liquid pump, comprising a movable unit and a fixed unit, wherein the movable unit can move relative to the fixed unit to pump out a product, an elastic mechanism is provided between the movable unit and the fixed unit, the elastic mechanism comprises at least one elastic strip, the elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product, characterized in that: The liquid pump further comprises an elastic mechanism adjusting member, the elastic mechanism adjusting member being formed on the elastic mechanism or connected to the elastic mechanism, the elastic mechanism adjusting member being movable between a first position and a second position, in which the elastic strip of the elastic mechanism is in a relaxed state, and in which the elastic strip of the elastic mechanism is in a preloaded state; The liquid pump is a press-type liquid pump, the movable unit comprises a pressure head and a piston rod connected to the pressure head; the fixed unit comprises a toothed sleeve and a cylinder connected to the toothed sleeve; The elastic mechanism adjustment member automatically realizes movement between the first position and the second position; The elastic mechanism adjusting member comprises a push plate disposed between the elastic mechanism and the pressure head, the push plate comprises a plate body and a first cantilever and a second cantilever suspended downward from the plate body, the lower surface of the plate body is formed in a step shape, including an upper step surface and a lower step surface; and The upper sleeve of the dental brace is provided with: a first guide wedge, the first guide wedge corresponds to the first cantilever and has an upwardly facing inclined surface; and a second guide wedge, the second guide wedge corresponding to the second cantilever and having a downwardly facing inclined surface; Among them, when the ram is at the top dead center of the stroke, the push plate is in the first position, in which the lower step surface of the push plate contacts the upper base of the elastic mechanism to make the elastic strip in a relaxed state; as the ram moves downward, the first cantilever contacts and interacts with the first guide wedge block to move the push plate from the first position to the second position, in which the upper step surface of the push plate contacts the upper base of the elastic mechanism to make the elastic strip in a preloaded state; and as the ram moves upward, the second cantilever contacts and interacts with the second guide wedge block to return the push plate from the second position to the first position.

8. The liquid pump according to claim 7, characterized in that A pawl is formed on the free end of the first cantilever and / or the second cantilever, and the pawl interacts with the first guide wedge and / or the second guide wedge.

9. A liquid pump, comprising a movable unit and a fixed unit, wherein the movable unit can move relative to the fixed unit to pump out a product, an elastic mechanism is provided between the movable unit and the fixed unit, the elastic mechanism comprises at least one elastic strip, the elastic strip applies a biasing force to the movable unit to reset the movable unit after pumping the product, characterized in that: The liquid pump further comprises an elastic mechanism adjusting member, the elastic mechanism adjusting member being formed on the elastic mechanism or connected to the elastic mechanism, the elastic mechanism adjusting member being movable between a first position and a second position, in which the elastic strip of the elastic mechanism is in a relaxed state, and in which the elastic strip of the elastic mechanism is in a preloaded state; The liquid pump is a press-type liquid pump, the movable unit comprises a pressure head and a piston rod connected to the pressure head; the fixed unit comprises a toothed sleeve and a cylinder connected to the toothed sleeve; The elastic mechanism adjustment member automatically realizes movement between the first position and the second position; The elastic mechanism adjusting member comprises a push plate disposed between the lower base of the elastic mechanism and the mouthpiece, and the upper surface of the push plate comprises an upper step surface and a lower step surface; as well as The piston rod is formed with: a first guide wedge, the first guide wedge comprising a downwardly facing inclined surface; and a second guide wedge, the second guide wedge comprising an upwardly facing inclined surface; Wherein, when the ram is at the top dead center of the stroke, the push plate is at the first position, in which the lower step surface of the push plate contacts the lower base, so that the elastic strip is in a relaxed state, and as the ram moves downward, the first guide wedge contacts and interacts with the push plate, so that the push plate moves from the first position to the second position, in which the upper step surface of the push plate contacts the lower base, so that the elastic strip is preloaded; As the pressure head moves upward, the second guide wedge contacts and interacts with the push plate to return the push plate from the second position to the first position.

10. The liquid pump according to claim 9, characterized in that A convex portion is formed on the lower surface of the lower base, and the convex portion contacts the upper step surface or the lower step surface of the push plate.

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