Pressing pump with guide mechanism

Abstract

The utility model provides a pressing pump with a guide mechanism, which can restrain or prevent a spray head from inclining in the pressing use process and improve the use experience of a user. The pressing pump comprises a spray head, a tooth socket, an air cylinder, a piston rod and an elastic reset mechanism, the air cylinder is connected with the tooth socket, a cylindrical air cylinder plug is installed in the air cylinder, the upper end of the piston rod is connected with the spray head, when the spray head is pressed, the piston rod and the spray head move downwards relative to the air cylinder, and the elastic reset mechanism is arranged on the piston rod. The lower portion of the piston rod is matched with the lower side portion of the air cylinder plug in an up-down sliding mode, the peripheral side of the piston rod is sleeved with the elastic reset mechanism, the upper end of the elastic reset mechanism is supported on a flange portion protruding from the peripheral face of the piston rod to the peripheral side, and the lower end of the elastic reset mechanism is supported on the air cylinder plug. A guide mechanism is arranged between the piston rod and the air cylinder plug, and the guide mechanism guides the piston rod or the spray head to move downwards.

Description

Technical Field

[0001] The utility model relates to a pressing pump with a guide mechanism. Background Art

[0002] Traditional pumps often feature an internal spring. During use, the liquid passes through the metal spring within the pump body. Prolonged contact between the liquid and the metal spring can cause the spring to rust, contaminating the liquid and potentially posing a health hazard. Therefore, to address the technical challenges of traditional pumps, an increasing number of pumps with external springs are appearing on the market. Pumps such as spray pumps, aerosol pumps, and lotion pumps all adopt this design. By placing the metal spring externally, they prevent contact between the liquid and the spring.

[0003] However, there is still a problem with the current spring-mounted press pump, that is, the press head (nozzle) is easily skewed during the pressing process. This is because the spring of the spring-mounted press pump is usually arranged to be sleeved on the outer peripheral side of the piston rod, with the upper end supported on the flange of the piston rod and the lower end supported on the cylinder plug. In other words, a part of the length of the piston rod is used to cooperate with the spring, resulting in a reduction in the interference fit between the lower part of the piston rod and the lower ring of the cylinder plug in the height direction. In addition, the guiding performance of the spring itself is poor. During the pressing process, the piston rod cannot be guided, resulting in the press head being skewed, which brings a bad user experience. Utility Model Content

[0004] The present invention is made based on the above problems existing in the prior art. The purpose of the present invention is to provide a pump with a guide mechanism, which can suppress or prevent the nozzle from tilting during the use of the pump, thereby improving the user experience.

[0005] The utility model provides a pressing pump with a guiding mechanism, the pressing pump comprising a nozzle, a socket, a cylinder, a piston rod and an elastic reset mechanism, the cylinder being connected to the socket, a cylindrical cylinder plug being installed in the cylinder, the upper end of the piston rod being connected to the nozzle, when the nozzle is pressed, the piston rod and the nozzle move downward relative to the cylinder, the lower part of the piston rod slides up and down with the lower part of the cylinder plug, the elastic reset mechanism is sleeved on the outer peripheral side of the piston rod, the upper end of the elastic reset mechanism is supported on a flange protruding from the outer peripheral side of the piston rod, and the lower end is supported on the cylinder plug, a guiding mechanism is provided between the piston rod and the cylinder plug, the guiding mechanism guides the downward movement of the piston rod or the nozzle.

[0006] In the above structure of the pressing pump, a guide mechanism is provided between the piston rod and the cylinder plug to guide the downward movement of the piston rod or the nozzle, thereby suppressing or preventing the nozzle from tilting during the pressing process, thereby improving the user experience.

[0007] In a preferred embodiment, the guide mechanism is configured as a first sleeve extending in the vertical direction. The first sleeve is sleeved around the outer periphery of the piston rod and the elastic return mechanism and is fixedly disposed on the inner periphery relative to the upper portion of the cylinder plug. The spray head includes an annular portion fixedly disposed relative to the piston rod and having a larger diameter than the first sleeve. The upper end of the first sleeve overlaps the annular portion in the vertical direction. When the spray head is pressed, the first sleeve slides on the inner surface of the annular portion. According to this structure, the first sleeve cooperates with the annular portion to enable the spray head to move downward stably without tilting.

[0008] Furthermore, in the aforementioned press pump with a guide mechanism, the first sleeve may be formed separately from the cylinder plug and fixed to the inner circumferential surface of the upper portion. With this configuration, an existing cylinder plug can be utilized, and simply by fixing the first sleeve to the cylinder plug, it is possible to suppress or prevent the nozzle from tilting during press use.

[0009] For example, a snap ring protruding toward the other is provided on one of the outer circumferential surface of the first sleeve and the inner circumferential surface of the upper portion, and a groove for the snap ring to be engaged is provided on the other. According to the above structure, the first sleeve can be fixed to the cylinder plug with a simple structure.

[0010] In addition, in the above-mentioned press pump with a guide mechanism, the first sleeve and the cylinder plug can be integrally formed. This can reduce the number of parts and the assembly time.

[0011] In another preferred embodiment, the guide mechanism is configured as a second sleeve extending downward from a position on the outer periphery of the flange portion relative to the elastic return mechanism. The lower end of the second sleeve vertically overlaps the upper portion of the cylinder plug, and the outer diameter of the second sleeve is smaller than the inner diameter of the upper portion. When the nozzle is pressed, the second sleeve slides on the inner surface of the upper portion. With this configuration, the second sleeve cooperates with the upper portion of the cylinder plug, enabling the nozzle to move downward stably without tilting.

[0012] In addition, in the above-mentioned press pump with a guide mechanism, the second sleeve and the piston rod may be integrally formed. This can reduce the number of parts and the assembly time.

[0013] In another preferred embodiment, the cylinder plug comprises an upper portion; a lower portion having a smaller diameter than the upper portion; and a connecting portion connecting the upper and lower portions. The elastic return mechanism is located vertically between the flange and the connecting portion. The guide mechanism is configured as a third sleeve extending upward from the inner circumferential end of the connecting portion. The third sleeve is sleeved onto the outer circumference of the piston rod on the inner circumference of the elastic return mechanism. The distance between the upper end of the third sleeve and the flange is set to be greater than the downward stroke of the spray head. When the spray head is pressed, the piston rod slides on the inner surface of the third sleeve. According to the above structure, the cooperation between the third sleeve and the piston rod enables the spray head to move downward stably without tilting.

[0014] Furthermore, in the aforementioned compression pump with a guide mechanism, the third sleeve may be integrally formed with the cylinder plug, the third sleeve extending continuously upward from the lower portion with an inner diameter identical to that of the lower portion. Integrally forming the third sleeve with the cylinder plug reduces the number of components and assembly time. Furthermore, by extending the third sleeve continuously upward from the lower portion with an inner diameter identical to that of the lower portion, the piston rod can slide more smoothly on the inner surface of the third sleeve.

[0015] In another preferred embodiment, the guide mechanism is configured as a fourth sleeve extending in the vertical direction. The fourth sleeve is sleeved around the outer circumference of the flange and fixedly positioned on the inner circumference relative to the upper portion of the cylinder plug. When the spray head is pressed, the flange slides on the inner surface of the fourth sleeve. With this configuration, the fourth sleeve cooperates with the piston rod via the flange, enabling the spray head to move downward stably without tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings illustrate non-limiting preferred embodiments of the present invention, which, when combined with the accompanying drawings, make the features and advantages of the present invention more apparent.

[0017] Figure 1 A cross-sectional view of the pressing pump according to the first embodiment of the present invention is shown, showing the pressing pump in a state ready for use.

[0018] Figure 2 yes Figure 1 A magnified view of part I.

[0019] Figure 3 A cross-sectional view of a pressing pump according to a second embodiment of the present invention is shown, showing a state where the pressing pump is ready for use.

[0020] Figure 4 yes Figure 3 Enlarged view of Part II.

[0021] Figure 5 A cross-sectional view of a pressing pump according to a third embodiment of the present invention is shown, showing a state where the pressing pump is ready for use.

[0022] Figure 6 An enlarged cross-sectional view of a cylinder plug of a pressing pump according to a third embodiment of the present invention is shown.

[0023] (Explanation of Symbols)

[0024] 10 nozzles

[0025] 20 braces

[0026] 30 cylinders

[0027] 40 piston rod

[0028] 42 flange

[0029] 50 elastic reset mechanism

[0030] 60, 60B cylinder plug

[0031] 61 Upper part of the cylinder plug

[0032] 62 The lower part of the cylinder plug

[0033] 63 connection part

[0034] D1 first sleeve

[0035] D11 groove

[0036] D2 second sleeve

[0037] D3 third sleeve

[0038] 100, 100A, 100B compression pumps

[0039] 611 snap ring

[0040] 1212 annular part DETAILED DESCRIPTION

[0041] To facilitate understanding of the present invention, the specific embodiments of the compression pump of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the drawings illustrate only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Those skilled in the art may make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings. Furthermore, the technical features of the different embodiments described below may be arbitrarily combined with one another, provided that no contradiction exists, and all of these fall within the scope of the present invention.

[0042] In the following specific description of the present invention, terms such as "upper", "lower", "inner" and "outer" used to indicate directions and orientations are based on the normal orientation of the press pump when in use as shown in the accompanying drawings. It can be understood that the orientation of the press pump may change in situations such as transportation and storage.

[0043] <First embodiment>

[0044] Figure 1 FIG1 is a cross-sectional view of the pressing pump 100 according to the first embodiment of the present invention, showing the pressing pump 100 in a state ready for use. Figure 2 yes Figure 1 A magnified view of part I.

[0045] The compression pump 100 includes a nozzle 10, a mouthpiece 20, a cylinder 30, a piston rod 40, and an elastic reset mechanism 50. The mouthpiece 20 is fixedly mounted on a container (not shown) by, for example, threaded engagement. The cylinder 30 is connected to the mouthpiece 20.

[0046] A cylindrical cylinder plug 60 is installed in the cylinder 30. At least a portion of the cylinder plug 60 is installed in the cylinder 30. More specifically, the cylinder plug 60 includes an upper portion (upper ring) 61; a lower portion (lower ring) 62 having a smaller diameter than the upper portion 61; and a connecting portion 63 connecting the upper and lower portions. The cylinder plug 60 is mounted on the inner circumferential surface of the upper portion of the cylinder 30 at the lower portion 62 and the connecting portion 63. For example, the cylinder plug 60 can be secured to the cylinder 30 using a flange-and-groove structure or other methods known in the art. The upper portion 61 is located above the cylinder 30.

[0047] Furthermore, a lower check valve 70 is installed in the cylinder 30. More specifically, the lower check valve 70 is installed at the lower end of the cylinder 30. For example, the lower check valve 70 includes a valve disc 71 located approximately in the center and a push cylinder 72 located on the outer periphery of the valve disc 71 (located closer to the outer periphery than the valve disc 71).

[0048] The upper end of the piston rod 40 is connected to the spray head 10. In this embodiment, the spray head 10 includes a nozzle core 11, which is connected to the piston rod 40 (the upper end of the piston rod 40 is connected to the spray head 10 via the nozzle core 11) and has an internal passageway that communicates with the internal passageway of the piston rod 40; and a housing 12. A nozzle is formed at the upper end of the nozzle core 11, which is exposed from the housing 12. The housing 12 is connected to the piston rod 40 via the nozzle core 11. Thus, the housing 12 is fixed relative to the piston rod 40. The housing 12 includes a first portion 121 that surrounds the nozzle core 11 from the outer periphery and has an annular portion 1212 at its lower portion; an annular second portion 122 that extends outward from the lower end of the first portion 121; and an annular third portion 123 that extends downward from the second portion 122. The third portion 123 is open at its lower end and slides vertically with the annular first wall portion 21 that extends upward from the mouthpiece 20. A cover 13 may also be provided. The cover 13 is detachably mounted on the housing 12 in a manner of covering the nozzle and is removed when in use. In addition, the nozzle is not limited to the above structure, and other structures known in the art may also be used.

[0049] When the spray head 10 is pressed, the piston rod 40 moves downward together with the spray head 10 relative to the cylinder 30. The lower part of the piston rod 40 slides up and down with the lower part 62 of the cylinder plug 60. In this embodiment, a piston 80 is connected at or near the lower end of the piston rod 40, and the part of the piston rod 40 to which the piston 80 is connected extends into the internal space of the cylinder 30. A sealing fit is formed between the outer peripheral surface of the piston 80 and the inner wall of the cylinder 30. The piston 80 is sleeved on the outer peripheral side of the piston rod 40. In addition, a through hole 41 is provided at the lower end of the piston rod 40, and the inner peripheral surface of the piston 80 can close the through hole 41, so that the two cooperate with each other to form an upper one-way valve. When the spray head 10 is at the top dead center of its stroke, the piston 80 closes and seals the through hole 41. As the spray head 10 is pressed, the piston 80 moves downward. Due to the friction between the outer circumference of the piston 80 and the inner wall of the cylinder 30, the piston 80 tends to move upward relative to the piston rod 40, exposing the through-hole 41 and thus opening the upper check valve. When the spray head 10 is pressed near the bottom dead center of its stroke, the push cylinder 72 of the lower check valve 70 abuts against the piston 80. Further pressing of the spray head 10 applies an upward thrust to the piston 80 through the push cylinder 72, exposing the through-hole 41. In this way, the push cylinder 72 ensures the opening of the upper check valve and facilitates its rapid opening. Alternatively, the piston rod 40 may have a reduced diameter portion at its lower portion, with a piston return spring 90 mounted on its outer circumference. One end of the piston return spring 90 abuts against the piston 80, while the other end abuts against the step between the reduced diameter portion and a portion of the piston rod 40 above the small neck. When the pressing force on the spray head 10 is removed and the spray head 10 returns to its original position (top dead center), the piston 80 moves downward relative to the piston rod 40, thereby closing the through hole 41. The piston of the piston rod 40 is not limited to the above-described structure and may also employ other structures known in the art. For example, the small-diameter portion and the piston return spring may be omitted.

[0050] The elastic reset mechanism 50 is sleeved on the outer peripheral side of the piston rod 40. The elastic reset mechanism 50 can adopt a metal spring (such as a coil spring). However, it is not limited to this. The elastic reset mechanism 50 can also adopt other structures known in the art. For example, it can also be made of plastic (plastic-supported elastic reset mechanism). The upper end of the elastic reset mechanism 50 is supported on the flange portion 42 protruding from the outer peripheral surface of the piston rod 40 to the outer peripheral side, and the lower end is supported on the cylinder plug 60 (more specifically, supported on the connecting portion 63 of the cylinder plug 60). The elastic reset mechanism 50 is located between the flange portion 42 and the connecting portion 63 in the up and down directions. After the pressing force applied to the nozzle 10 is removed, the elastic reset mechanism 50 applies force to the flange portion 42 upward to return the piston rod 40 and the nozzle 10 to their original positions.

[0051] A guide mechanism is provided between the piston rod 40 and the cylinder plug 60 , and the guide mechanism guides the downward movement of the spray head 10 .

[0052] Specifically, the guide mechanism is configured as a first sleeve D1 extending in the up-down direction. The first sleeve D1 is sleeved on the outer peripheral side of the piston rod 40 and the elastic reset mechanism 50. The first sleeve D1 is fixedly provided on the inner peripheral side (at a position closer to the inner peripheral side than the upper portion 61) relative to the upper portion 61 of the cylinder plug 60. In the present embodiment, the first sleeve D1 is formed separately from the cylinder plug 60 and is fixed to the inner peripheral surface of the upper portion 61. For example, the first sleeve D1 is fixedly connected to the upper portion 61 of the cylinder plug 60 at the lower part by a retaining ring or the like. Figure 2 In the example, a retaining ring 611 protruding toward the first sleeve D1 is provided on the inner circumferential surface of the upper portion 61, and a groove D11 for the retaining ring 611 to be hooked is provided on the outer circumferential surface of the lower portion of the first sleeve D1. Alternatively, instead of or in addition to the above structure, another retaining ring protruding toward the upper portion 61 may be provided on the outer circumferential surface of the first sleeve D1, and another groove for the retaining ring to be hooked may be provided on the upper portion 61. Alternatively, the first sleeve D1 and the cylinder plug 60 may be integrally molded. In this case, the number of components and the assembly man-hours can be reduced. The first sleeve D1 and the cylinder plug 60 may each be made of plastic, for example.

[0053] The annular portion 1212 in the housing 12 of the nozzle 10 is configured to have a larger diameter than the first sleeve D1. More specifically, the inner diameter of the annular portion 1212 is configured to be larger than the outer diameter of the first sleeve D1. The upper end of the first sleeve D1 overlaps with the annular portion 1212 in the vertical direction (height direction). The inner circumference of the annular portion 1212 has a space for the upper end of the first sleeve D1 to pass through. When the nozzle is pressed, the first sleeve D1 slides on the inner surface of the annular portion 1212. In this way, the first sleeve D1 cooperates with the annular portion 1212 to play a guiding role (the first sleeve D1 guides the nozzle 10) during the use of the nozzle when pressed, preventing the nozzle from tilting. In addition, the shapes of the first sleeve D1 and the annular portion 1212 when viewed in the vertical direction can be circular. The first sleeve D1 and the annular portion 1212 can be respectively formed to have a fixed diameter in the vertical direction.

[0054] Furthermore, the dental mouthpiece 20 is provided with a support portion 22. The support portion 22 is annular and extends upward from the upper surface of the dental mouthpiece 20. The support portion 22 surrounds and supports the upper portion 61 from the outer circumference.

[0055] Hereinafter, the operating principle of the pressing pump 100 will be described.

[0056] exist Figure 1In the embodiment, the nozzle 10 of the pressing pump 100 is at the top dead center of the stroke, and the piston 80 seals the through hole 41, thereby closing the upper one-way valve. At this time, the upper end of the first sleeve D1 and the annular portion 1212 have overlapped in the vertical direction.

[0057] When the user presses down on the spray head 10, as the spray head 10 and piston rod 40 move downward, the first sleeve D1 slides upward relative to the spray head 10 on the inner surface of the annular portion 1212 of the spray head 10. In other words, the annular portion 1212 of the spray head 10 slides downward on the outer circumference of the first sleeve D1. This allows the spray head 10 to move downward stably without tilting.

[0058] Furthermore, friction between piston 80 and the inner wall of cylinder 30 causes piston 80 to move upward relative to piston rod 40. When piston 80 comes into contact with push tube 72 of lower check valve 70, an upward thrust is applied to piston 80, exposing through-hole 41 relative to the upward movement of piston rod 40. This opens the upper check valve of press pump 100. At this point, the product within cylinder 30 enters the space within piston rod 40 via through-hole 41, moves upward, and is ultimately ejected through spray head 10.

[0059] After the pressure on the spray head 10 is removed, the spray head 10 and the piston rod 40 return upwards under the action of the elastic return mechanism 50. During this process, the friction between the piston 80 and the cylinder 30 causes the piston 80 to move downward relative to the piston rod 40. At this time, the piston return spring 90 also applies downward pressure to the piston 80, thereby closing the through hole 41 and, in other words, the upper check valve.

[0060] Moreover, during the upward movement of the nozzle 10, negative pressure is generated in the internal space of the cylinder 30, which causes the valve plate 71 of the lower one-way valve 70 to move upward, thereby opening the lower one-way valve 70, and the product in the container can enter the internal space of the cylinder 30 for the next pumping.

[0061] <Second embodiment>

[0062] Figure 3 A cross-sectional view of a compression pump 100A according to a second embodiment of the present invention is shown, showing a state where the compression pump is ready for use. Figure 4 yes Figure 3 The enlarged view of Part II, in order to simplify the drawing, Figure 4 Some structures are omitted. The following description focuses on the differences from the first embodiment. Components identical to those in the previous embodiment are sometimes denoted by the same reference numerals, and repeated descriptions are omitted. Unless otherwise described below or conflicting with other technical features, the features described in the first embodiment also apply to the second embodiment and will not be described in detail here.

[0063] The pressing pump 100A includes a nozzle 10, a socket 20, a cylinder 30, a piston rod 40, and an elastic reset mechanism 50. The cylinder 30 is connected to the socket 20. A cylindrical cylinder plug 60 is installed in the cylinder 30. The cylinder plug 60 has: an upper part 61; a lower part 62 with a smaller diameter than the upper part 61; and a connecting part 63 connecting the upper part and the lower part. The upper end of the piston rod 40 is connected to the nozzle 10. When the nozzle 10 is pressed, the piston rod 40 moves downward relative to the cylinder together with the nozzle 10. The lower part of the piston rod 40 slides up and down with the lower part 62 of the cylinder plug 60. The elastic reset mechanism 50 is sleeved on the outer peripheral side of the piston rod 40. The upper end of the elastic reset mechanism 50 is supported by the flange part 42 protruding from the outer peripheral surface of the piston rod 40, and the lower end is supported by the connecting part 63 of the cylinder plug 60.

[0064] A guide mechanism is provided between the piston rod 40 and the cylinder plug 60 , and the guide mechanism guides the downward movement of the piston rod 40 .

[0065] In the pressing pump 100A, the guiding mechanism is configured as a second sleeve D2 extending downward from a position in the flange portion 42 that is closer to the outer peripheral side than the elastic reset mechanism 50. The lower end of the second sleeve D2 overlaps with the upper portion 61 of the cylinder plug 60 in the up and down directions. The outer diameter of the second sleeve D2 is configured to be smaller than the inner diameter of the upper portion 61. When the nozzle is pressed, the second sleeve D2 slides on the inner surface of the upper portion 61. In this way, the second sleeve D2 cooperates with the upper portion 61 of the cylinder plug 60 to play a guiding role (the second sleeve D2 guides the piston rod 40) during the use of the pressing nozzle, thereby preventing the nozzle from tilting.

[0066] Preferably, the second sleeve D2 is integrally formed with the piston rod 40. That is, the second sleeve D2 forms part of the piston rod 40. This reduces the number of components and assembly time. The second sleeve D2 and the piston rod 40 can be made of, for example, plastic. Alternatively, the second sleeve D2 and the piston rod can be formed separately and secured to each other via fasteners or the like.

[0067] When the ejector head 10 of the pressing pump 100A is at the top dead center of the stroke, the lower end of the second sleeve D2 and the upper portion 61 of the cylinder plug 60 overlap in the vertical direction.

[0068] When the user presses down the spray head 10, as the spray head 10 and the piston rod 40 move downward, the second sleeve D2 slides on the inner surface of the upper portion 61. Thus, the piston rod 40 and the spray head 10 connected thereto can move downward stably without tilting.

[0069] <Third embodiment>

[0070] Figure 5 A cross-sectional view of a compression pump 100B according to a third embodiment is shown, showing a state in which the compression pump is ready for use. Figure 6 An enlarged cross-sectional view of the cylinder plug 60B of the compression pump 100B according to the third embodiment is shown. The following description focuses on the differences from the first embodiment. Components identical to those in the first embodiment are sometimes designated with the same reference numerals, and duplicate descriptions are omitted. Unless otherwise specified below or conflicting with other technical features, the features described in the first embodiment also apply to the third embodiment and will not be described in detail here.

[0071] The pressing pump 100B includes a nozzle 10, a socket 20, a cylinder 30, a piston rod 40, and an elastic return mechanism 50. The cylinder 30 is connected to the socket 20. A cylindrical cylinder plug 60B is installed in the cylinder 30. The cylinder plug 60B has an upper portion 61; a lower portion 62 having a smaller diameter than the upper portion 61; and a connecting portion 63 connecting the upper portion and the lower portion. The upper end of the piston rod 40 is connected to the nozzle 10. When the nozzle 10 is pressed, the piston rod 40 moves downward relative to the cylinder together with the nozzle 10. The lower portion of the piston rod 40 slides up and down with the lower portion 62 of the cylinder plug 60B. The elastic return mechanism 50 is sleeved on the outer peripheral side of the piston rod 40. The upper end of the elastic return mechanism 50 is supported by the flange portion 42 protruding from the outer peripheral surface of the piston rod 40, and the lower end is supported by the connecting portion 63 of the cylinder plug 60B.

[0072] A guide mechanism is provided between the piston rod 40 and the cylinder plug 60B, and the guide mechanism guides the downward movement of the piston rod 40 .

[0073] In the pressing pump 100B, the guiding mechanism is configured as a third sleeve D3 extending upward from the inner peripheral end of the connecting portion 63. The third sleeve D3 is sleeved on the outer peripheral side of the piston rod 40 on the inner peripheral side of the elastic reset mechanism 50. The distance H between the upper end of the third sleeve D3 and the flange portion 42 in the up and down directions is set to be greater than the downward stroke of the nozzle 10, so that the third sleeve D3 does not hinder the downward movement of the piston rod 40. When the nozzle 10 is pressed, the piston rod 40 slides on the inner surface of the third sleeve D3. In this way, the third sleeve D3 cooperates with the piston rod 40 to play a guiding role (the third sleeve D3 guides the piston rod 40) during the use of the pressing nozzle, thereby preventing the nozzle from tilting.

[0074] Preferably, the third sleeve D3 is integrally formed with the cylinder plug 60B (the third sleeve D3 is formed as a part of the cylinder plug 60B). The third sleeve D3 extends continuously upward from the lower part 62 with an inner diameter that is the same as the inner diameter of the lower part 62. In this way, the length of the portion where the piston rod 40 and the cylinder plug 60B slide up and down is lengthened, thereby enabling the nozzle 10 to move downward stably without tilting. In addition, by integrally forming the third sleeve D3 with the cylinder plug 60B, the number of components can be reduced and the assembly time can be reduced. By extending continuously upward from the lower part 62 with an inner diameter that is the same as the inner diameter of the lower part 62, the piston rod 40 can further slide smoothly on the inner surface of the third sleeve D3.

[0075] <Fourth embodiment>

[0076] The following mainly describes the differences from the first embodiment. Unless there is a contrary description in the following content or it conflicts with other technical features, the features described in the first embodiment are also applicable to the fourth embodiment and will not be described in detail here.

[0077] In this fourth embodiment, the pressing pump is similar to the pressing pump of the first embodiment, and includes a nozzle, a socket, a cylinder, a piston rod and an elastic reset mechanism. The cylinder is connected to the socket. A cylindrical cylinder plug is installed in the cylinder. The cylinder plug has: an upper part; a lower part with a smaller diameter than the upper part; and a connecting part connecting the upper part and the lower part. The upper end of the piston rod is connected to the nozzle. When the nozzle is pressed, the piston rod moves downward relative to the cylinder together with the nozzle. The lower part of the piston rod slides up and down with the lower part of the cylinder plug. The elastic reset mechanism is sleeved on the outer peripheral side of the piston rod. The upper end of the elastic reset mechanism is supported by a flange protruding from the outer peripheral surface of the piston rod toward the outer peripheral side, and the lower end is supported by the cylinder plug.

[0078] A guide mechanism is provided between the piston rod and the cylinder plug, and the guide mechanism guides the downward movement of the piston rod.

[0079] In the fourth embodiment, the guide mechanism is provided as a fourth sleeve extending in the vertical direction (also refer to Figure 1 The fourth sleeve is mounted on the outer circumference of the flange and is fixedly positioned on the inner circumference relative to the upper portion of the cylinder plug. When the nozzle is pressed, the flange slides on the inner surface of the fourth sleeve. Thus, the fourth sleeve, through the flange, engages with the piston rod, providing guidance during the use of the press-fit nozzle and preventing the nozzle from tilting.

Claims

1. A pressing pump with a guide mechanism, the pressing pump comprising a nozzle, a toothed sleeve, a cylinder, a piston rod and an elastic reset mechanism, the cylinder being connected to the toothed sleeve, a cylindrical cylinder plug being installed in the cylinder, the upper end of the piston rod being connected to the nozzle, when the nozzle is pressed, the piston rod and the nozzle move downward relative to the cylinder, the lower part of the piston rod and the lower part of the cylinder plug slidingly cooperate up and down, the elastic reset mechanism being sleeved on the outer peripheral side of the piston rod, the upper end of the elastic reset mechanism being supported on a flange protruding from the outer peripheral side of the outer peripheral surface of the piston rod, and the lower end being supported on the cylinder plug, characterized in that A guide mechanism is provided between the piston rod and the cylinder plug, and the guide mechanism guides the downward movement of the piston rod or the spray head.

2. The pressure pump with a guide mechanism according to claim 1, characterized in that: The guide mechanism is configured as a first sleeve extending in the vertical direction. The first sleeve is sleeved on the outer circumference of the piston rod and the elastic return mechanism, and is fixedly arranged on the inner circumference relative to the upper part of the cylinder plug. The nozzle has an annular portion fixedly arranged relative to the piston rod and having a larger diameter than the first sleeve. The upper end of the first sleeve overlaps with the annular portion in the vertical direction. When the nozzle is pressed, the first sleeve slides on the inner surface of the annular portion.

3. The pressure pump with a guide mechanism according to claim 2, characterized in that: The first sleeve is formed separately from the cylinder plug and is fixed to the inner peripheral surface of the upper portion.

4. The pressure pump with a guide mechanism according to claim 3, characterized in that: One of the outer circumferential surface of the first sleeve and the inner circumferential surface of the upper portion is provided with a snap ring protruding toward the other, and the other is provided with a groove for the snap ring to be hooked.

5. The press pump with a guide mechanism according to claim 2, characterized in that: The first sleeve and the cylinder plug are integrally formed.

6. The pressure pump with a guide mechanism according to claim 1, characterized in that: The guide mechanism is provided as a second sleeve extending downward from a position on the outer circumference side of the elastic return mechanism in the flange portion. The lower end of the second sleeve overlaps with the upper portion of the cylinder plug in the vertical direction, and the outer diameter of the second sleeve is set to be smaller than the inner diameter of the upper portion. When the spray head is pressed, the second sleeve slides on the inner surface of the upper portion.

7. The press pump with a guide mechanism according to claim 6, characterized in that: The second sleeve and the piston rod are integrally formed.

8. The pressure pump with a guide mechanism according to claim 1, characterized in that: The cylinder plug comprises: an upper portion; a lower portion having a smaller diameter than the upper portion; and a connecting portion connecting the upper portion and the lower portion. The elastic return mechanism is located between the flange portion and the connecting portion in the vertical direction. The guide mechanism is provided as a third sleeve extending upward from the inner peripheral end of the connecting portion. The third sleeve is sleeved on the outer circumference of the piston rod on the inner circumference of the elastic reset mechanism. The distance between the upper end of the third sleeve and the flange portion is set to be greater than the downward stroke of the nozzle. When the spray head is pressed, the piston rod slides on the inner surface of the third sleeve.

9. The press pump with a guide mechanism according to claim 8, characterized in that: The third sleeve is integrally formed with the cylinder plug. The third sleeve continuously extends upward from the lower portion with an inner diameter identical to that of the lower portion.

10. The pressure pump with a guide mechanism according to claim 1, characterized in that: The guide mechanism is configured as a fourth sleeve extending in the vertical direction. The fourth sleeve is sleeved on the outer peripheral side of the flange portion and is fixedly arranged on the inner peripheral side relative to the upper portion of the cylinder plug. When the nozzle is pressed, the flange slides on the inner surface of the fourth sleeve.

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