Metering pump with novel high-pressure-resistant plunger sealing structure

Abstract

The utility model discloses a metering pump with a novel high-pressure-resistant plunger sealing structure. The metering pump comprises a pump head, a plunger, a metering pump body and two one-way valve assemblies. And the pump head is fixed on the metering pump main body. The pump head is provided with a liquid conveying channel and an overflowing channel which are communicated with each other. The two one-way valve assemblies are symmetrically arranged at the two ends of the infusion channel. And one end of the plunger extends into the overflowing channel on the pump head, and the other end of the plunger is connected with the driving end of the metering pump main body. According to the utility model, the plunger is sleeved with the middle ring and the two groups of sealing filler assemblies which are symmetrically arranged. Multiple guarantees of plunger sealing are achieved through the sealing gaskets in the sealing filler assemblies, and the situation that due to the fact that one sealing gasket is broken, conveyed high-pressure liquid directly enters the plunger pump, and a pump body is damaged is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of metering pump, concretely relates to a metering pump with novel high-pressure-resistant plunger sealing structure. BACKGROUND

[0002] In prior art, the plunger type metering pump is an important device of hydraulic system, which relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working cavity to realize oil suction and oil compression. The plunger type metering pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation, and is widely used in high-pressure, large-flow and flow-regulated occasions, such as hydraulic machines, engineering machinery and ships.

[0003] A novel high-pressure sealed water seal structure is disclosed in Chinese patent with publication number "CN217926252U", which relates to the technical field of plunger pumps and comprises a plunger pump body, a water seal, a plunger and an O-ring. The plunger pump body is provided with an outwardly expanded annular groove, the water seal is embedded in the annular groove, the outer side of the water seal is in interference fit with the plunger pump body, the outer side of the plunger is in interference fit with the inner side of the water seal, and the O-ring is arranged between the side surface of the annular groove and the side surface of the water seal and is in interference fit with the plunger pump body and the water seal respectively. The water seal is made of carbon fiber material.

[0004] The above-mentioned patent uses interference fit of the water seal outer side and the body and interference fit of the inner side and the sliding plunger, and uses high-strength O-ring to support the two sides at the bottom to realize sealing of the plunger during reciprocating movement. However, the single sealing ring has low sealing protection degree for the plunger. When the sealing ring is locally damaged, high-pressure liquid will directly enter the driving components of the plunger pump, causing damage to the plunger pump. At the same time, the sealing ring will move slightly under long-term work of the plunger. Since the friction coefficient between the outer surface of the sealing ring and the hole is high, the sealing ring and the hole are prone to friction damage under the condition that the outer surface of the sealing ring is not lubricated in time, thereby shortening the service life of the plunger pump. UTILITY MODEL CONTENTS

[0005] In order to make up for the shortcomings of the prior art, the utility model provides a metering pump with novel high-pressure-resistant plunger sealing structure to solve the technical problems of low sealing protection degree of single sealing ring and difficulty in timely lubrication of the surface of the sealing ring.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows:

[0007] The utility model provides a metering pump with novel high pressure plunger sealing structure, including pump head, plunger, metering pump main body and two check valve assemblies, pump head is fixed on metering pump main body, pump head is set up with the liquid delivery channel and the overflow channel who intercommunicate, two check valve assemblies are symmetrically set up in the both ends of liquid delivery channel, one end of plunger is inserted into the overflow channel on the pump head, and the other end is connected with the drive end of metering pump main body, the outer ring of plunger is sleeved with high pressure sealing assembly.

[0008] The high pressure sealing assembly includes an intermediate ring, two limiting guide rings, and two groups of sealing packing assemblies. The intermediate ring is sleeved on the plunger. The two limiting guide rings are symmetrically arranged on the two sides of the intermediate ring. The two groups of sealing packing assemblies are respectively arranged in the regions between the two limiting guide rings and the intermediate ring.

[0009] Further, the sealing packing assembly includes a plurality of sealing washers arranged in sequence.

[0010] Further, the intermediate ring is provided with a plurality of overflow through holes. The overflow through holes are uniformly distributed around the circumference of the intermediate ring.

[0011] Further, the sealing washers in each group of the sealing packing assemblies are four in total.

[0012] Further, each of the sealing washers is made of red copper.

[0013] Further, the intermediate ring and the limiting guide rings on the two sides are made of tin bronze.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The utility model sets the intermediate ring and the two symmetrically arranged groups of sealing packing assemblies on the plunger. The sealing washers in each group of the sealing packing assemblies provide multiple safeguards for the sealing of the plunger, effectively preventing the high-pressure liquid being transported from directly entering the interior of the plunger pump due to the rupture of one of the sealing washers, thereby preventing damage to the pump body.

[0016] 2. The utility model sets a plurality of overflow through holes on the intermediate ring, so that when a small amount of liquid adheres to the surface of the plunger and flows along the surface of the plunger to the position of the intermediate ring, the liquid will flow through the overflow through holes on the intermediate ring to the outer surfaces of the sealing washers, thereby lubricating the surfaces of the sealing washers as a whole, and preventing the service life of the sealing washers from being shortened due to the high friction coefficient between the plunger, the sealing washers, and the hole. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2The relative position diagram of the plunger and the high-pressure sealing assembly in the utility model is shown.

[0019] Figure 3 The structure diagram of the high-pressure sealing assembly in the utility model is shown. Figure 2 The local enlarged view of the middle A part.

[0020] The figure mark: 1, pump head;2, plunger;3, metering pump main body;4, one-way valve assembly;5, infusion channel;6, flow passage;7, high-pressure sealing assembly;7-1, middle ring;7-2, limit guide ring;7-3, sealing washer;7-4, flow through hole. Specific implementation

[0021] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation on the utility model.

[0022] The utility model will be further described below in combination with the drawings.

[0023] As Figure 1 And 2 shown, a kind of metering pump with novel high-pressure plunger sealing structure, including pump head 1, plunger 2, metering pump main body 3 and two one-way valve assemblies 4.Pump head 1 is fixed on metering pump main body 3.Pump head 1 is opened with mutually communicating infusion channel 5 and flow passage 6.Two one-way valve assemblies 4 are symmetrically arranged at the two ends of infusion channel 5, for realizing the directional delivery of liquid in infusion channel 5.The one end of plunger 2 is inserted into flow passage 6 on pump head 1, and the other end is connected with the driving end of metering pump main body 3, and can reciprocate under the driving of metering pump main body 3.The outer circle of plunger 2 is sleeved with high-pressure sealing assembly 7, to avoid the damage and leakage of plunger 2 under high temperature and high pressure environment.

[0024] Specific structure as Figure 2 And 3 Shown, high-pressure sealing assembly 7 includes middle ring 7-1, two limit guide rings 7-2 and two groups of sealing filler assemblies.Two limit guide rings are symmetrically arranged on plunger 2 with middle ring 7-1 as the symmetric axis.Two groups of sealing filler assemblies are arranged in the region between two limit guide rings and middle ring 7-1, for realizing the double sealing protection between the outer surface of plunger 2 and the inner wall of flow passage 6.

[0025] As Figure 3 shown, the sealing packing assembly comprises a plurality of sealing gaskets 7-3 arranged in sequence. By arranging a plurality of sealing gaskets 7-3 independent of each other, multi-layer sealing protection is achieved on the outer surface of the plunger 2. When one of the sealing gaskets 7-3 is broken, the sealing effect can be maintained by the other sealing gaskets 7-3.

[0026] Further, each sealing gasket 7-3 in each group of sealing packing assemblies is four. Each sealing gasket 7-3 is made of red copper. The sealing gasket 7-3 made of red copper helps to cool the sealing gasket 7-3 during the reciprocating movement of the plunger 2, thereby improving the reliability of the sealing gasket 7-3. At the same time, the sealing gasket 7-3 made of red copper has good adaptability to the processing defects of the inner wall of the flow passage 6 after being installed in the flow passage 6, and has good sealing performance.

[0027] Further, in the present embodiment, a plurality of flow-through holes 7-4 are formed in the intermediate ring 7-1. The flow-through holes 7-4 are uniformly distributed around the axis of the intermediate ring 7-1. In use, when a small amount of liquid adheres to the surface of the plunger and flows along the surface of the plunger 2 to the position of the intermediate ring 7-1, it will flow through the flow-through holes 7-4 on the intermediate ring 7-1 to the outer surface of each sealing gasket 7-3, thereby achieving overall surface lubrication of each sealing gasket 7-3. This reduces the friction between the plunger 2 and the sealing gasket 7-3 and prolongs the service life of the plunger 2 and the sealing gasket 7-3.

[0028] In addition, in the present embodiment, the intermediate ring 7-1 and the two side limiting guide rings 7-2 are made of tin bronze. The tin bronze material has high compressive strength, wear resistance and corrosion resistance, thereby ensuring that the metering pump can stably deliver high-pressure liquid for a long time.

[0029] The working process of the utility model is as follows:

[0030] The plunger 2 reciprocates in the flow passage 6 under the drive of the metering pump body 3. During the advancement of the plunger 2, a small amount of liquid adheres to the surface of the plunger and flows along the surface of the plunger 2. When the liquid moves to the position of the intermediate ring 7-1, it flows through the flow-through holes 7-4 on the intermediate ring 7-1 to each sealing gasket 7-3, thereby achieving overall surface lubrication of each sealing gasket 7-3. This reduces the friction between the plunger 2 and the sealing gasket 7-3 and prolongs the service life of the plunger 2 and the sealing gasket 7-3.

[0031] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A metering pump with a novel high-pressure plunger sealing structure, comprising a pump head (1), a plunger (2), a metering pump body (3) and two one-way valve assemblies (4); the pump head (1) is fixed on the metering pump body (3); a liquid delivery channel (5) and a flow passage (6) are formed in the pump head (1) and communicate with each other; the two one-way valve assemblies (4) are symmetrically arranged at the two ends of the liquid delivery channel (5); one end of the plunger (2) extends into the flow passage (6) in the pump head (1), and the other end is connected with a driving end of the metering pump body (3); a high-pressure sealing assembly (7) is sleeved on the outer ring of the plunger (2), characterized in that: the high-pressure sealing assembly (7) comprises an intermediate ring (7-1), two limiting guide rings (7-2) and two groups of sealing packing assemblies; the intermediate ring (7-1) is sleeved on the plunger (2); the two limiting guide rings are symmetrically arranged on the two sides of the intermediate ring (7-1); the two groups of sealing packing assemblies are respectively arranged in the regions between the two limiting guide rings and the intermediate ring (7-1).

2. The metering pump with a new type of high-pressure resistant plunger seal structure according to claim 1, characterized in that: The sealing packing assembly comprises a plurality of sealing gaskets (7-3) arranged in sequence.

3. The metering pump with a new type of high-pressure resistant plunger seal structure according to claim 1, characterized in that: A plurality of flow-through holes (7-4) are formed in the intermediate ring (7-1); the flow-through holes (7-4) are uniformly distributed around the axis of the intermediate ring (7-1).

4. The metering pump with a new type of high-pressure resistant plunger seal structure according to claim 2, characterized in that: The sealing gaskets (7-3) in each group of sealing packing assemblies are four in total.

5. The metering pump with new type high pressure resistant plunger seal structure according to claim 2, characterized in that: Each of the sealing gaskets (7-3) is a gasket made of red copper.

6. The metering pump with a new type of high-pressure resistant plunger seal structure according to claim 1, characterized in that: The intermediate ring (7-1) and the limiting guide rings (7-2) on the two sides are made of tin bronze.

Images