CN207960865U - A kind of No leakage plunger type metering pump - Google Patents

Abstract

The utility model discloses a non-leakage plunger type metering pump, which comprises a pump head, a plunger, an inlet check valve assembly, and an outlet check valve assembly. High-pressure sealing assembly, the high-pressure sealing assembly is set in the cavity of the pump head through the adjustment bolt and the seal cover, there is a gap between the adjustment bolt and the plunger, a low-pressure seal is arranged between the gap and the seal cover, and the plunger is set There is a return channel communicating with the cavity of the pump head, a return valve assembly is provided at one end of the return channel, and a communication pipe is provided between the return channel and the gap. The utility model aims at the problem of leakage in the existing plunger type metering pumps. Through the coordinated use of the high-pressure seal group, low-pressure seal and return valve assembly, the purpose of no leakage can be realized, and the structure is simple and reasonable. It is easy to realize and convenient for large-scale popularization and application.

Description

A leak-free plunger metering pump

technical field

The utility model belongs to the technical field of pump bodies, in particular to a non-leakage plunger type metering pump.

Background technique

Leakage from the plunger of the plunger metering pump was a major initial problem and was deemed reasonable. There are standards that stipulate that as long as the leakage of no more than 5-7 drops per minute is considered qualified, therefore, the existing metering pumps have more or less leakage problems, but with the development of industry, the continuous pursuit of environmental protection and the presence of harmful liquids The application of plunger metering pumps is inevitable under the process requirements, especially the application of plunger metering pumps in chemical industry and petroleum is more extensive. Therefore, solving the leakage problem of the plunger metering pump is an inevitable direction of industrial development.

Utility model content

Aiming at the problems existing in the prior art, the design purpose of the utility model is to provide a non-leakage plunger type metering pump.

The non-leakage plunger type metering pump includes a pump head, a plunger, an inlet check valve assembly, and an outlet check valve assembly, and is characterized in that one end of the plunger extending into the cavity of the pump head is covered A high-pressure sealing assembly is arranged next to it, and the high-pressure sealing assembly is set in the pump head cavity through the adjusting bolt and the seal cover. There is a gap between the adjusting bolt and the plunger, and a low-pressure seal is arranged between the gap and the seal cover. A sealing member, a return channel communicating with the cavity of the pump head is provided in the plunger, a return valve assembly is provided at one end of the return channel close to the cavity, and a communication pipe is provided between the return channel and the gap.

The leak-free plunger metering pump is characterized in that the high-pressure sealing assembly includes a seal 1 and a seal 2, and the seal 1 and the seal 2 are stacked alternately and then socketed on the outer wall of the plunger. The first seal is provided with an annular groove, and the second seal is provided with an annular rib that is inserted into the annular groove.

The above-mentioned non-leakage plunger metering pump is characterized in that there are three seals one and two seals two.

The non-leakage plunger metering pump is characterized in that the low-pressure seal is an annular sealing gasket.

The non-leakage plunger type metering pump is characterized in that the return valve assembly includes a valve ball, a return valve spring, and a spring seat nut, and the spring seat nut is fixedly arranged at the end of the plunger, and the return valve spring One end of the spring is fixedly connected with the spring seat nut, and the other end of the return valve spring is provided with a valve ball.

The above-mentioned non-leakage plunger metering pump is characterized in that an O-ring is arranged on the outer wall of the plunger located in the gap.

The utility model aims at the problem of leakage in the existing plunger type metering pumps. Through the coordinated use of the high-pressure seal group, low-pressure seal and return valve assembly, the purpose of no leakage can be realized, and the structure is simple and reasonable. It is easy to realize and convenient for large-scale popularization and application.

Description of drawings

Fig. 1 is the explosion diagram of the utility model;

Fig. 2 is a sectional view of the utility model;

In the figure, 1-pump head, 2-plunger, 3-inlet check valve assembly, 4-outlet check valve assembly, 5-high pressure seal assembly, 51-seal one, 52-seal two, 53-ring Groove, 54-ring rib, 6-adjusting bolt, 7-seal cover, 8-gap, 9-low pressure seal, 10-return channel, 11-communicating pipe, 12-valve ball, 13-return valve spring , 14-spring seat nut, 15-O-ring.

Detailed ways

The utility model is further described in detail below in conjunction with the accompanying drawings of the description, and specific implementation methods are given.

As shown in Figure 1-2, the utility model is a non-leakage plunger type metering pump, which includes a pump head 1, a plunger 2, an inlet check valve assembly 3, and an outlet check valve assembly 4, in order to realize no leakage of the metering pump For the purpose, a high-pressure sealing assembly 5 is sleeved on the end of the plunger 2 protruding into the cavity of the pump head 1. The high-pressure sealing assembly 5 is set in the cavity of the pump head 1 through the adjusting bolt 6 and the seal cover 7. A gap 8 is provided between the bolt 6 and the plunger 2. The gap 8 is used to accommodate a small amount of liquid leaking from the high-pressure area. In order to prevent the liquid from leaking to the outside of the pump body, a low-pressure seal is provided between the gap 8 and the seal cover 7. 9, the low-pressure seal 9 is an annular sealing gasket, in order to facilitate the liquid accumulated in the gap 8 to return to the cavity of the pump head 1, a return channel 10 communicating with the cavity of the pump head 1 is provided in the plunger 2, A return valve assembly is provided at one end of the return channel 10 close to the cavity, and a communication pipe 11 is provided between the return channel 10 and the gap 8 .

Among them, the high-pressure sealing assembly 5 includes three first seals 51 and two second seals 52. The first seal 51 and the second seal 52 are stacked alternately and then socketed on the outer wall of the plunger 2. The first seal 51 is provided with a ring The groove 53 and the sealing member 2 52 are provided with an annular rib 54 inserted into the annular groove 53 . The specific structure of the return valve assembly is as follows: it includes a valve ball 12, a return valve spring 13, and a spring seat nut 14. The spring seat nut 14 is fixedly arranged at the end of the plunger 2, and one end of the return valve spring 13 is fixedly connected to the spring seat nut 14. , the other end of the return valve spring 13 is provided with a valve ball 12 , and an O-ring 15 is provided on the outer wall of the plunger 2 located in the gap 8 .

The working principle of the utility model:

The pressure of the liquid in the pump cavity is gradually increased by the plunger 2 during operation, and a small amount of liquid leaks to the low-pressure area through the high-pressure sealing component 5, and is gradually accumulated in the low-pressure area under the action of the low-pressure seal 9. When the plunger 2 During the last movement, the return valve is opened by the vacuum in the pump chamber, and at the same time, the liquid in the low-pressure area is sucked back into the pump chamber with the help of the O-ring 15 . However, the low-pressure area is a closed area, which will not inhale the outer stage air and affect the flow accuracy of the metering pump. The goal of no leakage is achieved.

In the working process of the utility model, when the plunger 2 is advancing, the pressure in the pump chamber increases, and a small amount of liquid leaks from the high-pressure pump chamber through the high-pressure sealing assembly 5 into the gap 8 in the low-pressure area. Under the action of the low-pressure sealing member 9, The liquid gradually accumulates in the low-pressure area, and the plunger 2 is pulled back. The ball valve 12 of the return valve assembly is opened by the vacuum of the pump chamber, and the liquid accumulated in the low-pressure area enters the return channel 10 through the communication pipe 11. Return to the cavity through the valve ball 12.

Claims (6)

1. A leak-free plunger metering pump, comprising a pump head (1), a plunger (2), an inlet check valve assembly (3), and an outlet check valve assembly (4), characterized in that the plunger (2) A high-pressure sealing assembly (5) is sleeved on one end extending into the cavity of the pump head (1), and the high-pressure sealing assembly (5) is set on the In the cavity of the pump head (1), there is a gap (8) between the adjustment bolt (6) and the plunger (2), and a low-pressure seal ( 9), the plunger (2) is provided with a return channel (10) in communication with the cavity of the pump head (1), the end of the return channel (10) close to the cavity is provided with a return valve assembly, the return channel ( A communication pipe (11) is provided between 10) and the gap (8). 2. A leak-free plunger metering pump according to claim 1, characterized in that the high-pressure sealing assembly (5) includes a seal one (51), a seal two (52), a seal one (51 ) and seal two (52) are stacked alternately and then socketed on the outer wall of the plunger (2). The seal one (51) is provided with an annular groove (53), and the seal two (52) is provided with an annular groove (53) The annular rib (54) that is plugged in is set. 3. A non-leakage plunger metering pump according to claim 2, characterized in that there are three seals one (51) and two seals two (52). 4. A non-leakage plunger metering pump according to claim 1, characterized in that the low-pressure seal (9) is an annular sealing gasket. 5. A non-leakage plunger metering pump according to claim 1, characterized in that the return valve assembly includes a valve ball (12), a return valve spring (13), and a spring seat nut (14), the The spring seat nut (14) is fixedly arranged at the end of the plunger (2), one end of the return valve spring (13) is fixedly connected with the spring seat nut (14), and the other end of the return valve spring (13) is provided with a valve ball ( 12). 6. A non-leakage plunger metering pump according to claim 1, characterized in that an O-ring (15) is provided on the outer wall of the plunger (2) in the gap (8).