Spring external liquid pump

Abstract

The invention provides a spring external liquid pump. The liquid pump includes a pressure head, a tooth cover, a liquid storage tank formed by a cylinder, a piston assembly, and a return compression spring arranged between the pressure head and the tooth cover to make the pressure head move axially upward relative to the tooth cover. The pressure head is provided with an upper spring seat, while the brace is provided with a lower spring seat. The indenter has a downwardly extending sleeve and the mouthpiece has an upwardly extending sleeve that telescopically nest within each other. According to the present invention, the upper end of the spring abuts against the upper spring seat by being sheathed in the sleeve member, and at the top dead center position of the pressing stroke, the lower end of the sleeve of the pressure head and the upper end of the sleeve of the dental crown are in the axial direction The upper part is spaced apart, and the lower end of the sleeve member extends to a position lower than the upper end of the sleeve of the mouthpiece. The invention can effectively solve the problem that the pressing head does not rotate smoothly or even gets stuck relative to the dental brace, and can realize the required pressing stroke with a relatively small size.

Description

technical field [0001] The invention relates to the field of push-type liquid pumps, and more specifically relates to a spring-mounted liquid pump in which a spring is arranged outside a liquid storage tank. Background technique [0002] The push-type liquid pump is generally installed at the opening of the container, and is used for pumping and distributing the liquid product in the container out of the container through a manual pressing operation by a user for use. This type of liquid pump has a return compression spring for returning the pump head to its original position after the user removes the downward pressure on the pump head, and at the same time pumps the liquid product in the container to the In the storage tank of the liquid pump for the next pump pressure distribution. At present, there is a push-type liquid pump on the market, such as Figure 8 and 9 As shown, it generally includes a pressure head 110 with an outlet, a mouthpiece 120 for connecting with a ...

AI Technical Summary

Problems solved by technology

The increased frictional force will hinder the normal sliding of the surfaces at both ends of the spring on the supporting surfaces of the upper spring seat 152 and the lower spring seat 121, causing the rotation of the pressure head 110 relative to the mouthpiece 120 to be hindered, thus affecting the position of the pressure head in the lock position and Smooth transition between release positions

In some more unfavorable cases, the end face of the spring wire can squeeze into the bearing surface of the spring seat made of relatively soft material (usually plastic), so that the indenter cannot rotate relative to the brace at all and cannot complete the process. Transition between lock position and release position

[0006] Secondly, since the spring 130 is arranged outside the liquid storage tank and located in the neck area of ​​the liquid pump, this type of spring-mounted liquid pump inherently has the problem of large size.

Moreover, since the indenter sleeve 111 and the mouthpiece sleeve 122 must at least partially overlap to cover the spring 130 and prevent it from being exposed, this limits the travel range of the indenter 110 moving up and down relative to the mouthpiece 120

For liquid pumps requiring a larger stroke range, the length of the neck area has to be increased, resulting in an unacceptable overall height of the product container

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