Correctable pressure pump

Abstract

The pressure pump includes a pressure head (110), a screw-on cap (120), and a cylinder (130), the screw-on cap is connected to the cylinder, and a piston rod (140) is connected below the pressure head, a piston (141) is attached to the piston rod, and a portion of the piston rod including the piston enters the inside of the cylinder. The side walls of the pressure head cooperate with the side walls of the screw-on cap to form a return mechanism accommodating chamber (160), which accommodates an elastic return mechanism (150), and the elastic return mechanism is supported between the pressure head and the screw-on cap and provided around the piston rod. The elastic return mechanism includes at least two elastic strips (151), each of which abuts against the piston rod. When the elastic return mechanism is deformed under pressure, each elastic strip is elastically deformed in the corresponding deformation plane, and the elastic strips are always out of contact with the inner wall of the return mechanism accommodating chamber until the pressing head is pressed to the bottom dead center position of the stroke. The pressure pump with this structure can automatically correct the elastic return mechanism, improve the repulsive force conversion efficiency, and extend its service life.

Description

[Technical Field]

[0001] This application relates to a pressure pump for pumping a product, and more particularly to the structural design of an elastic return mechanism in the pressure pump. [Background technology]

[0002] Pressure pumps are widely used in fields such as daily necessities (e.g., bath additives, hand soap, shampoo, etc.) and are used to pump products from containers for use. The main part of a pressure pump is made of plastic and is provided with an elastic return mechanism for returning the pressure pump to its original position. In conventional general pressure pumps, the elastic return mechanism is usually a metal spring. Metal springs have a negative impact on the recycling of pressure pumps. Specifically, pressure pumps include an assembly of metal and plastic parts, so they must be disassembled when collected, which makes the collection of pressure pumps difficult.

[0003] In order to improve the recycling efficiency of pressure pumps, a plastic elastic return mechanism has been proposed instead of a metal spring. Pressure pumps equipped with a plastic spring may be made entirely of plastic, which contributes to the recovery and reuse of pressure pumps.

[0004] It has been found that during the use of a plastic pressure pump with an elastic return mechanism, the plastic elastic return mechanism can become twisted or deflected during compression. When twisted and / or deflected, the resilience of the elastic return mechanism is lost, reducing the return ability of the pressure pump. In more serious cases, such twisting and / or deflection can permanently damage the elastic return mechanism, ultimately causing the pressure pump to lose its return function.

[0005] Therefore, in the field of pressure pumps, there is a need to further improve the structure of pressure pumps in order to overcome the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0006] The present invention has been made to solve the problems existing in the prior art, and aims to provide a pressure pump with an improved structure that has the ability to correct the twist and / or deflection of the elastic return mechanism, thereby improving the repulsive force conversion efficiency of the elastic return mechanism and extending the service life of the pressure pump.

[0007] The pressure pump of the present invention includes a pressure head, a screw-on cap, and a cylinder. The screw-on cap is connected to the cylinder. A piston rod is connected to the lower side of the pressure head. A piston is attached to the piston rod, and the piston rod, including the piston, is inserted into the cylinder. The side walls of the pressure head cooperate with the side walls of the screw-on cap to form a return mechanism accommodating chamber. The return mechanism accommodating chamber accommodates an elastic return mechanism, which is supported between the pressure head and the screw-on cap and mounted around the piston rod. The elastic return mechanism includes at least two elastic strips, each of which is positioned to abut against the piston rod. When the elastic return mechanism is deformed under pressure, unless the elastic return mechanism is twisted or deflected, each elastic strip elastically deforms in a corresponding deformation plane. Furthermore, unless the elastic return mechanism is twisted or deflected, the elastic strips are always out of contact with the inner wall of the return mechanism accommodating chamber, at least until the pressure head is pressed to the bottom dead center of the stroke.

[0008] Specifically, the compression pump configured as described above improves the conversion efficiency of repulsive force during compression by selecting the structure and dimensions of the elastic return mechanism. This structure also automatically corrects any twisting or deflection that occurs during compression of the elastic return mechanism due to uneven structure, biasing force, etc. Specifically, if no twisting or deflection occurs, the elastic strip maintains deformation within the same deformation plane and does not contact the inner wall of the return mechanism housing chamber throughout the entire compression stroke up to the bottom dead center position, or only contacts the inner wall when the elastic strip reaches the bottom dead center position. In this way, if the elastic strip twists or deflects during compression, space is left in the return mechanism housing chamber for the elastic strip to return to its original position, allowing the elastic strip to be corrected. This reduces or avoids loss of repulsive force due to twisting or deflection.

[0009] Furthermore, if the elastic strip in the pressure pump is twisted or deflected, it can come into contact with the inner wall during the pressing process before reaching the bottom dead center position, and the contact with the inner wall applies a thrust to the elastic strip to return it to its original position, thereby achieving automatic correction.

[0010] In one specific configuration, the elastic return mechanism further comprises an upper support ring, the upper end of the elastic strip is connected to the upper support ring, and the upper support ring is supported or connected to the pressing head. Additionally or alternatively, the elastic return mechanism further comprises a lower support ring, the lower end of the elastic strip is connected to the lower support ring, and the lower support ring is supported or connected to the screw-on cap.

[0011] Preferably, two elastic strips may be provided, with the lines connecting the fulcrums of the two elastic strips on the upper support ring passing through the center of the upper support ring, and similarly, the lines connecting the fulcrums of the two elastic strips on the lower support ring may also pass through the center of the lower support ring.

[0012] In one case, the upper support ring is rotatable relative to the pressure head and the lower support ring is rotatable relative to the screw-on cap, and when the pressure head is pressed and the elastic return mechanism is deformed, the elastic return mechanism may become twisted.

[0013] In another case, a first cooperating portion is formed on the upper support ring and / or the lower support ring, and a second cooperating portion is formed on the piston rod, and when the elastic return mechanism is assembled with the pressing head and the piston rod, the first cooperating portion cooperates with the second cooperating portion to form a synchronization mechanism, in which the upper support ring and the lower support ring can rotate synchronously with the pressing head and the piston rod, and hardly generates torsion but may generate deflection.

[0014] In one specific configuration, one of the first cooperating portion and the second cooperating portion is a groove, and the other of the first cooperating portion and the second cooperating portion is a rib extending along the axial direction of the piston rod. In another specific configuration, the first cooperating part is an internal gear hole and the second cooperating part is an external gear shaft. [Brief explanation of the drawings]

[0015] Specific embodiments of the present invention can be more clearly understood from the structures illustrated in the accompanying drawings, in which: [Figure 1] Figure 1a is a cross-sectional view of a pressure pump according to a first embodiment of the present invention, with the pressure pump shown at top dead center of its stroke; Figure 1b is another cross-sectional view of the pressure pump shown in Figure 1a, with the pressure pump shown being compressed; and Figure 1c is yet another cross-sectional view of the pressure pump shown in Figure 1a, with the pressure pump shown at bottom dead center of its stroke. [Figure 2] Figure 2a is a cross-sectional view taken along line AA in Figure 1a, Figure 2b is a cross-sectional view taken along line BB in Figure 1b, and Figure 2c is a cross-sectional view taken along line CC in Figure 1c. [Figure 3]FIG. 3 shows a cross-sectional view of the pressure head of the pressure pump shown in FIGS. 1a to 1c and a piston rod connected to the pressure head. [Figure 4] FIG. 4 shows a cross-sectional view of the screw-on cap of the pressure pump shown in FIGS. 1a to 1c. [Figure 5] Fig. 5a shows a front view of the elastic return mechanism of the pressure pump shown in Fig. 1a to Fig. 1c, Fig. 5b shows a side view of the elastic return mechanism shown in Fig. 5a, and Fig. 5c shows a perspective view of the elastic return mechanism shown in Fig. 5a. [Figure 6] Figure 6a shows another perspective view of the elastic return mechanism shown in Figure 5a, and schematically shows the lines connecting the deformation planes of each elastic strip and its fulcrum. Figure 6b shows a plan view of the elastic return mechanism, and schematically shows the lines connecting the deformation planes of each elastic strip and its fulcrum. [Figure 7] FIG. 7 shows a schematic perspective view of the elastic return mechanism assembled with the pressing head and the piston rod. [Figure 8] FIG. 8 shows a schematic perspective view of the elastic return mechanism assembled with the screw-on cap. [Figure 9] FIG. 9 is a perspective view of an elastic return mechanism of a pressure pump according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a front view of a pressure head and a piston rod of a pressure pump according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view of the elastic return mechanism shown in FIG. 9 assembled with the pressing head and piston rod shown in FIG. [Figure 12] FIG. 12 is a perspective view of an elastic return mechanism of a pressure pump according to a third embodiment of the present invention. [Figure 13] FIG. 13 is a front view of a head and a piston rod of a pressure pump according to a third embodiment of the present invention. [Figure 14] FIG. 14 is a perspective view of the elastic return mechanism shown in FIG. 12 assembled with the pressing head and piston rod shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to facilitate understanding of the present invention, the following detailed description will be given of specific embodiments of the pressure pump of the present invention with reference to the accompanying drawings. It should be understood that the drawings are merely preferred embodiments of the present invention and do not limit the scope of the present invention. Those skilled in the art can make various obvious modifications, changes, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and can freely combine features in the embodiments described below as long as there is no contradiction, and all such combinations fall within the scope of protection of the present invention.

[0017] The terms indicating direction and orientation, such as "up" and "down," used in the following specific explanation of the present invention are all based on the normal orientation of the pressure pump in use as shown in the drawings, and it should be understood that the orientation of the pressure pump may change during transportation, storage, etc.

[0018] <First Example> 1 to 8 show a pressure pump 100 according to a first embodiment of the present invention. Here, Figures 1a to 1c show cross-sectional views of the pressure pump 100 in different states, with the pressure pump 100 at the top dead center of its stroke in Figure 1c, the pressure pump 100 at the bottom dead center of its stroke in Figure 1b, and the pressure pump 100 at the top dead center of its stroke in Figure 1c.

[0019] As shown in FIGS. 1a to 1c, the pressure pump 100 includes a pressure head 110, a screw-on cap 120, and a cylinder 130. The screw-on cap 120 is connected to the cylinder 130. A piston rod 140 is provided below the pressure head 110. This piston rod 140 may be formed integrally with the pressure head 110 as shown in the drawings, or may be a separate member connected to the pressure head 110 below. A piston 141 may be attached to the piston rod 140, for example, and the piston 141 may be attached to the lower end or near the lower end of the piston rod 140. A portion of the piston rod 140 including the piston 141 (for example, the lower end shown in the drawings) enters the internal space of the cylinder 130.

[0020] 1a to 1c, the side walls of the press head 110 and the screw-on cap 120 cooperate with each other to form a return mechanism accommodating chamber 160, and the elastic return mechanism 150 of the press pump 100 is accommodated in the return mechanism accommodating chamber 160. Specifically, the elastic return mechanism 150 is supported between the press head 110 and the screw-on cap 120, and is located around the piston rod 140.

[0021] As shown in Fig. 3, the pressing head 110 has a top inner surface 111, and the upper end of the elastic return mechanism 150 can abut or connect with the top inner surface 111. As shown in Fig. 4, a step 121 is provided inside the screw cap 120, and the lower end of the elastic return mechanism 150 can abut or connect with the step 121.

[0022] 5a-5c show front, side, and perspective views, respectively, of the elastic return mechanism 150. The elastic return mechanism 150 comprises a plurality of elastic strips 151. In the preferred configuration shown, the elastic return mechanism 150 comprises two elastic strips 151. The planes in which the two elastic strips 151 lie are preferably parallel to each other, as shown in FIG. 5b. While two elastic strips 151 are preferred, it will be understood that the elastic return mechanism 150 may comprise other numbers of elastic strips 151 greater than two, such as three or four, and these are within the scope of the present invention.

[0023] The upper end of each elastic strip 151 may be connected to an upper support ring 152, which is supported by the pressing head 110. The lower end of the elastic strip 151 is connected to a lower support ring 153, which is supported by the elastic return mechanism 150.

[0024] In other alternative configurations, the upper support ring 152 may be omitted, such that the upper end of the elastic strip 151 directly contacts or connects with the press head 110. Alternatively, the lower support ring 153 may be omitted, such that the lower end of the elastic strip 151 directly contacts or connects with the screw-on cap 120.

[0025] In the present application, the dimensions and structure of the elastic return mechanism 150 have been improved. Specifically, as shown in Fig. 6a, the elastic strips 151 are located on the same deformation plane P. When the elastic return mechanism 150 is deformed under pressure, the elastic strips 151 always elastically deform on this deformation plane P if the elastic return mechanism 150 does not twist or deflect. For example, by arranging the elastic strips 151 symmetrically with respect to the axis of the elastic return mechanism 150, deformation of the elastic strips 151 on the same plane can be realized.

[0026] Preferably, as can be seen more clearly in Figure 6b, when two elastic strips 151 are provided, a line connecting the fulcrums of the two elastic strips 151 on the upper support ring 152 passes through the center of the upper support ring 152. Similarly, a line connecting the fulcrums of the elastic strips 151 on the lower support ring 153 may also pass through the center of the lower support ring 153.

[0027] 7 and 8 are schematic perspective views of the elastic return mechanism 150 assembled with the pressing head 110 and the screw-on cap 120, respectively. Here, the upper support ring 152 of the elastic return mechanism 150 is supported by or connected to the inner surface 111 of the top portion of the pressing head 110, and the lower support ring 153 of the elastic return mechanism 150 is supported by or connected to the stepped portion 121 of the screw-on cap 120.

[0028] 2a, the elastic strip 151 is provided against the piston rod 140. The dimensions of the elastic strip 151 are set so that when the elastic strip 151 is pressed and deformed, the elastic strip 151 does not contact the inner wall 161 of the return mechanism accommodating chamber 160 at least until the pressing head 110 is pressed to the stroke bottom dead center position shown in FIG. 1c, provided that the elastic return mechanism 150 is not twisted or deflected. In other words, the elastic strip 151 does not need to contact the inner wall 161 throughout the entire pressing stroke, including the stroke bottom dead center position, or the elastic strip 151 contacts the inner wall 161 only when the pressing head 110 reaches the stroke bottom dead center, but does not contact the inner wall 161 before that. Here, the inner wall 161 is formed by at least one of the inner wall surface of the side peripheral wall of the pressing head 110 and the inner wall surface of the side peripheral wall of the screw-on cap 120. Furthermore, if the elastic strip 151 is twisted during the pressing process, the elastic strip 151 may come into contact with the inner wall 161 before reaching the bottom dead center of the stroke. At this time, such contact between the inner wall 161 and the elastic strip 151 applies a thrust to the elastic strip 151, pressing it toward a position where it is in close contact with the piston rod 140, thereby fulfilling the role of self-correction.

[0029] The specific installation of the elastic return mechanism 150 described above can realize automatic correction of twists that occur in the process of the elastic return mechanism 150 being pressed, and can also improve the conversion efficiency of the elastic return force of the elastic return mechanism 150. Next, the principle of automatic correction by the elastic return mechanism 150 of the pressure pump 100 of the present application will be described in detail.

[0030] Figure 1a shows the pressure pump 100 at the top dead center of its stroke, and Figure 2a is a cross-sectional view taken along line AA in Figure 1a, where the elastic return mechanism 150 is in a relaxed state and its elastic strip 151 abuts against the piston rod 140.

[0031] When a product needs to be pumped from a container (not shown), as shown in FIG. 1b, a user presses the pressure head 110 of the pump 100 to move the pressure head 110 downward. As the pressure head 110 moves downward, the elastic return mechanism 150 is compressed. As the elastic return mechanism 150 is compressed, uneven force causes the upper support ring 152 and the lower support ring 153 of the elastic return mechanism 150 to rotate relative to each other, causing the elastic return mechanism 150 to twist. The uneven force can be caused by a number of factors, including the fact that the user's pressing direction cannot perfectly align with the axis of the pump 100 and is typically at a small angle. There are also slight differences in the mass, bending degree, density, etc. of each elastic strip 151, which can result in differences in the amount of deformation and elastic force even when the same pressure is applied.

[0032] As a result of the twisting of the elastic return mechanism 150, at least one elastic strip 151 is displaced from contact with the piston rod 140 toward the inner wall 161 of the return mechanism accommodating chamber 160, as shown in Fig. 2b, where Fig. 2b shows a cross-sectional view taken along line BB in Fig. 1b. In this manner, the elastic strip 151 comes into contact with the inner wall 161 due to the twisting of the elastic return mechanism 150.

[0033] The pressure head 110 continues to be pressed until the pressure pump 100 reaches the bottom dead center position of the stroke, as shown in FIG. 1c. During this process, the elastic strip 151 moves away from the piston rod 140 and toward the inner wall 161 of the return mechanism chamber 160. As the pressure head 110 continues to be pressed down, the deformation and displacement of the elastic strip 151 increase until it comes into contact with the inner wall 161. At this time, the dimensions of the elastic strip 151 are set so that the elastic strip 151 does not always come into contact with the inner wall 161 when it is in close contact with the piston rod 140 without twisting or deflection. Therefore, when the elastic strip 151 comes into contact with the inner wall 161 due to the twisting or deflection of the elastic return mechanism 150, the inner wall 161 applies a corrective force (or thrust) F1 to the elastic strip 151 toward the piston rod 140, returning the elastic strip 151 toward the piston rod 140, as shown in FIG. 2c.

[0034] As a result, the above-described configuration and dimensional settings of the elastic return mechanism 150 of the present application can serve to automatically correct twisting of the elastic return mechanism 150. According to the configuration and operating principle disclosed above, in the present application, the elastic strip 151 is installed so as not to come into contact with the inner wall 161 of the return mechanism housing chamber 160 during the pressing process until the bottom dead center of the stroke. This allows the elastic strip 151 of the elastic return mechanism 150 to be deformed in the same plane and corrected to a state where it abuts against the piston rod 140, thereby providing the elastic return mechanism 150 with good repulsive force conversion efficiency and improving its return ability. In addition, correcting the torsion of the elastic return mechanism 150 also extends the service life of the elastic return mechanism 150.

[0035] <Second Example> 9 to 11 show a second embodiment of the present invention, which shows a perspective view of the pressure head 210 and elastic return mechanism 250 of the pressure pump of the second embodiment, and an assembled perspective view of these. In the following description of the second embodiment, the technical features that differ from the first embodiment will be mainly described. However, unless there is a contrary explanation in the following content or a conflict with other technical features, the features described in the first embodiment also apply to the second embodiment, and therefore will not be described in detail here.

[0036] 9, the elastic return mechanism 250 of the pressure pump of the second embodiment includes a plurality of elastic strips 251 (two in the illustrated embodiment), and the upper and lower ends of the elastic strips 251 are respectively connected to an upper support ring 252 and a lower support ring 253. At least one of the upper support ring 252 and the lower support ring 253 is provided with a first cooperating portion in the form of a groove 254.

[0037] 10 shows a pressure head 210 of a pressure pump according to the second embodiment. A piston rod 240 is connected to the lower part of the pressure head 210, and a second cooperating portion extending in the axial direction of the piston rod 240 is formed on the outer surface of the piston rod 240. This second cooperating portion is, for example, a rib 241 as shown in the figure.

[0038] When the elastic return mechanism 250 and the pressing head 210 are assembled, as shown in FIG. 11, the elastic return mechanism 250 is fitted onto the piston rod 240, and the groove 254 and the rib 241 cooperate with each other to form a synchronization mechanism, which can rotate the upper support ring 252 and the lower support ring 253 of the elastic return mechanism 250 synchronously to prevent the elastic return mechanism 250 from twisting.

[0039] However, in a configuration having such a synchronization mechanism, the pressing force acting on each elastic strip 251 of the elastic return mechanism 250 may be uneven, or slight differences in the shape, density, etc. between each elastic strip 251 due to manufacturing tolerances may cause the entire elastic return mechanism 250 to deflect slightly. As a result, the elastic strip 251 deflects away from the piston rod 240 and toward the inner wall of the return mechanism housing chamber, just like the elastic strip 151 of the first embodiment shown in Figures 2a to 2c. Similarly, because the dimensions and shape of the elastic strip 251 are set similarly to those of the elastic strip 151 of the first embodiment, the deflection of the elastic return mechanism 250 in the second embodiment is also automatically corrected in the same way.

[0040] <Third Example> 12 to 14 show a third embodiment of the present invention, which shows a pressure head 310, an elastic return mechanism 350, and an assembled perspective view of the pressure pump of the third embodiment. In the following description of the third embodiment, the technical features that differ from the first and second embodiments will be mainly described. However, unless there is a contrary description in the following content or a conflict with other technical features, the features described in the first and second embodiments also apply to the third embodiment, and therefore will not be described in detail here.

[0041] Like the pressure pump of the second embodiment, the pressure pump of the third embodiment also includes a synchronization mechanism. As shown in FIG. 12, the elastic return mechanism 350 includes a plurality of elastic strips 351, each of which has an upper end connected to an upper support ring 352 and a lower end connected to a lower support ring 353. At least one of the upper support ring 352 and the lower support ring 353 has an internal gear hole 354 formed therein as a first cooperating portion. Correspondingly, as shown in FIG. 13, the piston rod 340 connected to the pressure head 310 has an external gear shaft shape. When the elastic return mechanism 250, the pressure head 310, and the piston rod 340 are assembled, the external gear shaft-type piston rod 340 and the internal gear holes 354 of the upper support ring 352 and the lower support ring 353 of the elastic return mechanism 350 cooperate to form a synchronization mechanism, which allows the elastic return mechanism 350 to rotate synchronously with the pressure head 310 and the piston rod 340 to prevent twisting.

[0042] However, as in the second embodiment, the elastic return mechanism 350 deflects when subjected to a pressing force, but the configuration of the pressure pump of the third embodiment has the ability to correct this deflection, similarly as described for the second embodiment.

Claims

1. a pressure head, a screw-on cap, and a cylinder, the screw-on cap being connected to the cylinder, a piston rod being connected to a lower portion of the pressure head, a piston being attached to the piston rod, and a portion of the piston rod including the piston being inserted into the cylinder; a side peripheral wall of the pressure head cooperates with a side peripheral wall of the screw-on cap to form a return mechanism accommodating chamber, an elastic return mechanism is accommodated in the return mechanism accommodating chamber, the elastic return mechanism is supported between the pressure head and the screw-on cap and is provided around the piston rod, the elastic return mechanism includes at least two elastic strips, the elastic strips are arranged so that each elastic strip abuts against the piston rod, and when the elastic return mechanism is deformed under pressure, if no twisting or deflection occurs in the elastic return mechanism, each elastic strip elastically deforms in a corresponding deformation plane, and if no twisting or deflection occurs in the elastic return mechanism, the elastic strips always do not contact the inner wall of the return mechanism accommodating chamber at least until the pressing head is pressed to a position of the stroke bottom dead center, When twisting or deflection occurs in the elastic return mechanism, the elastic strip can come into contact with the inner wall before the pressure head reaches the bottom dead center of the stroke, and this contact applies a thrust to the elastic strip, pressing the elastic strip toward a position where it is in close contact with the piston rod, thereby automatically correcting itself.

2. the elastic return mechanism further comprises an upper support ring and / or a lower support ring; The upper end of the elastic strip is connected to the upper support ring, and the upper support ring is supported or connected to the pressing head; 2. The pressure pump according to claim 1, wherein a lower end of the elastic strip is connected to the lower support ring, and the lower support ring is supported or connected to the screw-on cap.

3. The elastic return mechanism comprises two of the elastic strips, and a line connecting the fulcrums of the two elastic strips on the upper support ring passes through the center of the upper support ring, and / or 3. The pressure pump according to claim 2, wherein a line connecting the fulcrums of the two elastic strips on the lower support ring passes through the center of the lower support ring.

4. the upper support ring is rotatable relative to the pressure head; and / or 3. The pressure pump according to claim 2, wherein the lower support ring is rotatable relative to the screw-on cap.

5. 3. The pressure pump according to claim 2, wherein a first cooperating portion is formed on the upper support ring and / or the lower support ring, a second cooperating portion is formed on the piston rod, and when the elastic return mechanism is assembled with the pressure head and the piston rod, the first cooperating portion cooperates with the second cooperating portion to form a synchronization mechanism.

6. 6. The pressure pump according to claim 5, wherein one of the first cooperating portion and the second cooperating portion is a groove, and the other of the first cooperating portion and the second cooperating portion is a rib extending along the axial direction of the piston rod.

7. 6. The pressure pump according to claim 5, wherein the first cooperating part is an internal gear hole, and the second cooperating part is an external gear shaft.

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