CN215256747U

CN215256747U - Waterproof structure of plunger pump and plunger pump

Info

Publication number: CN215256747U
Application number: CN202121357184.9U
Authority: CN
Inventors: 肖春荣; 曾胜军
Original assignee: Shenzhen Shengkang Electronic Technology Co ltd
Current assignee: Shenzhen Shengkang Electronic Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-12-21
Anticipated expiration: 2031-06-17

Abstract

The utility model relates to a waterproof structure of a plunger pump and the plunger pump, the waterproof structure comprises a cylinder body, a piston arranged in the cylinder body and a connecting rod driving the piston to reciprocate up and down along the inner wall of the cylinder body; the end part of the piston is sleeved with a sealing sleeve which is tightly matched with the inner wall of the cylinder body, and the piston further comprises a waterproof sleeve with a telescopic middle part; one end of the waterproof sleeve is sleeved in the middle of the piston in a sealing mode, and the other end of the waterproof sleeve is sealed with the cylinder opening of the cylinder body. The plunger pump has the waterproof structure. The utility model discloses in, it is waterproof to utilize seal cover and waterproof cover to realize the bilayer, prevents that the fluid of cylinder body front end from leaking from the cylinder body rear portion.

Description

Waterproof structure of plunger pump and plunger pump

Technical Field

The utility model relates to a plunger pump field, especially a be applied to waterproof construction and plunger pump of tooth ware.

Background

The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships.

At present, the plunger pump is not only used for oil pressure, but also can be used for water pressing and water spraying, for example, the plunger pump is used for pressing water in a tooth flushing device, and some flushing pumps also use the plunger pump for water spraying. At present, such plunger pumps comprise a motor, an eccentric wheel, an eccentric shaft, a connecting rod, a push rod, a piston, a cylinder, a water inlet and a water outlet; these devices are mounted on the housing of the plunger pump. The motor drives the eccentric wheel to rotate, the eccentric shaft vertically installed on the eccentric wheel rotates around the central shaft of the eccentric wheel, the connecting rod (push rod) is connected with the eccentric shaft and the piston to enable the piston to rapidly reciprocate in the cylinder, the water is sucked into the cylinder from the water inlet when the piston is drawn backwards under the control of the check valves installed on the water inlet and the water outlet, the water sucked into the piston is pressed out from the water outlet when the piston is pressed forwards, and the water pressure pressed out from the water outlet is large due to the large motion pressure of the piston, so that the water spray is formed.

In some cases, for simplicity, the connecting rod and the push rod are combined into a whole and called a tappet, the tail end of the tappet is wrapped by a rubber sleeve to form a piston, the rubber sleeve is matched with the inner wall of a cylinder body, so that water, oil or gas in front of the cylinder body can be prevented from leaking out through the matching surface of the piston and the inner wall of the cylinder body, the efficiency of the plunger pump is reduced, and particularly when the plunger pump is used for pumping oil and water, if the oil or the water leaks out from the space between the piston and the inner wall of the cylinder body, the oil or the water flows onto an eccentric wheel or other electronic circuits along with the tappet to damage the plunger pump.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a prevent that the plunger pump from leaking, provide a waterproof construction and plunger pump of plunger pump, adopt double-deck waterproof construction, prevent that the water or other fluids of cylinder body front end from leaking the cylinder body rear end.

The utility model discloses a realize that the technical scheme that its technical purpose adopted is: a waterproof structure of a plunger pump comprises a cylinder body, a piston arranged in the cylinder body, and a connecting rod driving the piston to reciprocate up and down along the inner wall of the cylinder body; the end part of the piston is sleeved with a sealing sleeve which is tightly matched with the inner wall of the cylinder body, and the piston further comprises a waterproof sleeve with a telescopic middle part; one end of the waterproof sleeve is sleeved in the middle of the piston in a sealing mode, and the other end of the waterproof sleeve is sealed with the cylinder opening of the cylinder body.

Further, in the waterproof structure of the plunger pump: the waterproof cover is characterized by further comprising a pressing cover, and the other end of the waterproof cover is pressed on a cylinder opening of the cylinder body through the pressing cover to form a sealing structure.

Further, in the waterproof structure of the plunger pump: the middle part of the waterproof sleeve forms a telescopic organ part.

Further, in the waterproof structure of the plunger pump: the middle part of the piston is also provided with a convex ring, and the convex ring is smoothly matched with the inner wall of the cylinder body, so that the piston can be prevented from inclining in the cylinder body, and the piston has a guiding function.

The utility model also provides a plunger pump, which comprises an outer cover and a base, wherein the base is fixedly provided with a motor and an eccentric gear, the eccentric gear is provided with an eccentric shaft, and the eccentric shaft is connected with a piston in the cylinder body through a connecting rod; still include above-mentioned plunger pump waterproof construction.

The utility model discloses in, it is waterproof to utilize seal cover and waterproof cover to realize the bilayer, prevents that the fluid of cylinder body front end from leaking from the cylinder body rear portion.

In addition, the piston is provided with a convex ring which is tightly matched with the inner wall of the cylinder body, so that the piston can be prevented from swinging in the cylinder body.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a perspective view of a plunger pump according to embodiment 1 of the present invention.

Fig. 2 is an exploded view of a plunger pump according to embodiment 1 of the present invention.

Fig. 3 is a front view of a plunger pump according to embodiment 1 of the present invention.

Fig. 4 is a cross-sectional view of fig. 3A-a.

Fig. 5 is an enlarged view of a portion of fig. 4B.

Fig. 6 is an exploded view of the waterproof structure in embodiment 1 of the present invention.

Detailed Description

As shown in fig. 1 and 2, the present embodiment is a small plunger pump, which mainly functions to pump and inject fluid such as water, oil, gas, etc. under pressure, for example, a plunger pump applied to a tooth washing device can pump and inject water from a water source such as a water tank, etc. to wash teeth, but the plunger pump can also be used for other fluids, for example, the plunger pump can be arranged in a fuel tank of an internal combustion engine to pump and inject product oil into a cylinder for burning, etc. In this embodiment, a plunger pump in a dental irrigator is taken as an example to explain how to prevent water leakage and damage to a circuit.

As shown in fig. 1, 2, 3 and 4, the plunger pump of the present embodiment has a housing 1 and a base 2, and the plunger pump body is mounted on the base 2, and the housing 1 covers the base 2. The motor 3 and the eccentric gear 15 are installed on the base 2, in the embodiment, the motor 3 is installed on the base 2 in parallel, the eccentric shaft 16 of the eccentric gear 15 is installed on the base 2 and is vertical to the shaft of the motor 3, the output gear is arranged on the output shaft of the motor 3, the eccentric gear 15 is a face gear, the output gear of the motor 3 is meshed with the eccentric gear 15, the motor 3 drives the eccentric gear 15 to rotate on the horizontal plane, the eccentric shaft 16 is vertically arranged on the eccentric gear 15, and the eccentric shaft 16 is parallel to the shaft of the eccentric gear 15 and is installed on the side face of the shaft of the eccentric gear 15. When the eccentric gear 15 is installed, a piston connection cover 14 may be installed on the eccentric gear 15. The motor 3 rotates the eccentric gear 15, and the eccentric shaft 16 will rotate around the axis of the eccentric gear 15, moving back and forth in the direction of the output shaft of the motor 3.

In this embodiment, the eccentric shaft 16 is mounted on the eccentric gear 15 and is not located at the center of the disk of the eccentric gear 15, so that when the eccentric gear 15 rotates around its central axis, the eccentric shaft 16 will rotate around the central axis of the eccentric gear 15, the eccentric shaft 16 is linked with the piston connecting cover 14, the piston connecting cover 14 is connected with the connecting rod 5, the connecting rod 5 connects the piston connecting cover 14 with the piston 20, as shown in fig. 3 and 4, when the eccentric shaft 16 rotates around the axis with the eccentric gear 15, the piston connecting cover 14 and the connecting rod 5 are driven to reciprocate, and at this time, the piston 20 moves back and forth in the cylinder 6.

In the embodiment, in order to ensure that the motor is not soaked by water when the teeth are washed, a unique double waterproof structure is adopted, as shown in fig. 5 and 6, the end of the piston 20 is sleeved with a sealing sleeve 7 tightly matched with the inner wall of the cylinder 6, the sealing sleeve 7 forms a first heavy waterproof structure, water in a compression area between the water inlet 10 and the water outlet 12 at the front part of the cylinder 6 is prevented from entering a mounting position of the motor 3 from the rear part of the cylinder 6, in addition, the motor 3 is mounted on the base 2 with control circuit boards, and in this embodiment, the piston 20 body is made of a rigid material, such as hard plastics, and the sealing sleeve 7 sleeved at the end part of the piston 20 can be tightly matched with the inner wall of the cylinder 6, so that moisture is prevented from entering the inner side of the piston 20 in the cylinder 6 from a gap between the sealing sleeve 7 and the inner wall of the cylinder 6 under high pressure. The waterproof jacket 8 which is telescopic in the middle is a second layer of waterproof; one end of the waterproof sleeve 8 is hermetically sleeved in the middle of the piston 20, and the other end of the waterproof sleeve is hermetically sealed with the cylinder opening of the cylinder body 6. In addition, the waterproof device also comprises a pressing cover 9, and the pressing cover 9 presses the other end of the waterproof sleeve 8 to the cylinder opening of the cylinder body 6 to form a sealing structure.

In this embodiment, the cylinder body 6 may be a stainless steel cylinder body, the piston 20 is a rigid material such as hard plastic, the sealing sleeve 7 is made of silica gel and has certain elasticity, and the waterproof sleeve 8 is made of silica gel with better elasticity, because one end of the waterproof sleeve 8 moves back and forth along with the piston. The other end is fixedly sealed on the opening of the cylinder body 6, therefore, the other end is provided with a movable end moving along with the piston 20, the other end is a fixed end, therefore, the other end needs to move back and forth, the structure has many options, and in the embodiment, the middle part of the waterproof sleeve 8 is selected to form the telescopic organ part 8-1.

In addition, the middle part of the piston 20 is also provided with a convex ring 20-1, and the convex ring 20-1 is smoothly matched with the inner wall of the cylinder body 6, so that the piston can be prevented from inclining in the cylinder body, and the guide function is realized. Thus, the inner wall of the cylinder 6 is matched with the convex ring 20-1 to prevent the piston 20 from swinging in the cylinder 6 and prevent the piston 20 from inclining in the cylinder 6, and the guide function is realized. In addition, a first check valve 11 is installed between the water inlet 10 and the interior of the cylinder 6 at the front end of the cylinder 6, and a second check valve 13 is installed between the water outlet 12 and the front end of the cylinder 6.

In this embodiment, a battery box 4 is disposed outside the base 2, and the battery is installed in the battery box 4 and is drawn out to supply power to the motor.

Claims

1. A waterproof structure of a plunger pump comprises a cylinder body (6), a piston (20) arranged in the cylinder body (6), and a connecting rod (5) driving the piston (20) to reciprocate up and down along the inner wall of the cylinder body (6); the method is characterized in that: a sealing sleeve (7) which is tightly matched with the inner wall of the cylinder body (6) is sleeved at the end part of the piston (20), and the piston further comprises a waterproof sleeve (8) with a telescopic middle part; one end of the waterproof sleeve (8) is sleeved in the middle of the piston (20) in a sealing way, and the other end of the waterproof sleeve is sealed with the cylinder opening of the cylinder body (6).

2. The waterproof structure of a plunger pump according to claim 1, characterized in that: the waterproof structure is characterized by further comprising a pressing cover (9), wherein the other end of the waterproof sleeve (8) is pressed on a cylinder opening of the cylinder body (6) through the pressing cover (9) to form a sealing structure.

3. The waterproof structure of a plunger pump according to claim 1, characterized in that: the middle part of the waterproof sleeve (8) forms a telescopic organ part (8-1).

4. The waterproof structure of a plunger pump according to claim 1, 2 or 3, characterized in that: the middle part of the piston (20) is also provided with a convex ring (20-1), and the convex ring (20-1) is smoothly matched with the inner wall of the cylinder body (6).

5. A plunger pump comprises a housing (1) and a base (2), wherein a motor (3) and an eccentric gear (15) are fixedly arranged on the base (2), an eccentric shaft (16) is arranged on the eccentric gear (15), and the eccentric shaft (16) is connected with a piston (20) in a cylinder body (6) through a connecting rod (5); the method is characterized in that: further comprising the plunger pump waterproof structure of any one of claims 1 to 4.