A double-sealed fully-cooled plunger pump head structure

Abstract

The present invention relates to a double-sealed fully cooled plunger pump head structure. It is characterized in that: a two-stage sealing assembly is arranged between the plunger and the pump head, the two-stage sealing assembly is composed of a primary sealing assembly and a secondary sealing assembly, a primary sealing assembly is arranged between the plunger and the pump head, a secondary sealing assembly is arranged between the plunger and the crimping component, the pump head, the plunger and the crimping component form a liquid storage cavity; a left cooling chamber is arranged on the pump head at the periphery of the friction pair formed by the plunger and the primary sealing assembly, a right cooling chamber is arranged at the right end of the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel arranged in the pump body. The present invention arranges a liquid storage cavity between the two-stage sealing assemblies, and arranges a leakage channel in the liquid storage cavity to connect to the pump inlet of the metering pump. This structure can ensure that the sealing structure plays a sealing role in sequence; a left cooling chamber and a right cooling chamber are arranged on the pump head, which can effectively and comprehensively cool the medium and the plunger kinematic pair at the same time.

Description

Technical Field

[0001] The invention relates to a double-sealed fully-cooled plunger pump head structure. Background Art

[0002] Since the plunger metering pump conveys the medium through the reciprocating motion of the plunger, the plunger seal is particularly critical. At present, the sealing structure used between the plunger and the pump body is a single-stage sealing structure composed of multiple sealing rings stacked together. This type of sealing structure will cause leakage due to deformation and wear of the sealing ring after a period of use, which greatly shortens the service life of the plunger metering pump.

[0003] The plunger pump whose medium is cryogenic liquid requires effective cooling of the plunger pump head. Due to the complex structure of the plunger pump head, the existing cooling device can only cool a small part of the pump head, which can easily cause the cryogenic liquid in the pump head to vaporize and produce adverse effects. At the same time, the reciprocating motion of the plunger will also generate heat. If it cannot be effectively cooled, one is that the wear of the plunger and the sealing ring will be accelerated and liquid leakage will occur, and the other is that the heat will be transferred to the medium cryogenic liquid in the pump head, causing the temperature of the cryogenic liquid in the pump head to rise and vaporize. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a technical solution for a double-sealed fully-cooled plunger pump head structure.

[0005] The described double-seal fully cooled plunger pump head structure is characterized in that: a crimping component is arranged on the pump head, the plunger is inserted into the crimping component, a two-stage sealing assembly is arranged between the plunger and the pump head, the two-stage sealing assembly is composed of a primary sealing assembly and a secondary sealing assembly, a primary sealing assembly is arranged between the plunger and the pump head, a secondary sealing assembly is arranged between the plunger and the crimping component, the pump head, the plunger and the crimping component form a liquid storage cavity, and the liquid storage cavity is located between the two-stage sealing assemblies; a left cooling chamber and a right cooling chamber are arranged on the pump head, the left cooling chamber is arranged on the pump head at the outer periphery of the friction pair formed by the plunger and the primary sealing assembly, the right cooling chamber is arranged at the right end of the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel arranged in the pump body.

[0006] The double-sealed fully-cooled plunger pump head structure is characterized in that a leakage channel connected to the liquid storage cavity is provided on the pump head.

[0007] The double-sealed fully-cooled plunger pump head structure is characterized in that the leakage channel is connected to the pump inlet of the pump head.

[0008] The double-seal fully-cooled plunger pump head structure is characterized in that the two-stage sealing components both use O-rings or lip-type sealing rings, and the lip-type sealing rings are arranged in cooperation with the support ring.

[0009] The described double-seal fully cooled plunger pump head structure is characterized in that the crimping component is composed of an inner pressure cap and an outer pressure cap, the primary sealing assembly is composed of a first support ring, a first lip-shaped sealing ring, a second support ring and a second lip-shaped sealing ring, the first support ring, the first lip-shaped sealing ring, the second support ring and the second lip-shaped sealing ring are sequentially arranged in the limiting cavity of the pump head, the inner pressure cap is threadedly matched with the pump head and contacts the second lip-shaped sealing ring; the secondary sealing assembly is composed of a third support ring and a third lip-shaped sealing ring, the third support ring and the third lip-shaped sealing ring are sequentially arranged in the limiting cavity of the inner pressure cap, the outer pressure cap is threadedly matched with the inner pressure cap and contacts the third lip-shaped sealing ring; the plunger, the inner pressure cap and the pump head form a liquid storage cavity.

[0010] The double-sealed fully-cooled plunger pump head structure is characterized in that the left cooling chamber is formed by a combination of a plurality of annular grooves and a sleeve provided on the pump head, and the sleeve is arranged on the periphery of the plurality of annular grooves.

[0011] The double-sealed fully-cooled plunger pump head structure is characterized in that the right cooling chamber is formed by a coolant flow channel opened at the right end of the pump head and a pump head cooling cover, and the pump head cooling cover is arranged outside the coolant flow channel.

[0012] The double-sealed fully-cooled plunger pump head structure is characterized in that the sleeve is welded on the pump head, and a coolant outlet is arranged on the sleeve.

[0013] The double-sealed fully-cooled plunger pump head structure is characterized in that the pump head cooling cover is welded on the pump head, and a coolant inlet is arranged on the pump head cooling cover.

[0014] The double-sealed fully-cooled plunger pump head structure is characterized in that the coolant flow channel is a labyrinth structure.

[0015] The present invention adopts a two-stage sealing structure, and a liquid storage chamber is arranged between the two-stage sealing components. A leakage channel is arranged in the liquid storage chamber and connected to the pump inlet of the metering pump. This structure can ensure that the two-stage sealing structures play a sealing role in sequence, that is, when the first-stage sealing component loses its function, the leaked medium is stored in the liquid storage chamber, and the pressure in the liquid storage chamber is much lower than the pump pressure. In this way, the second-stage sealing component can play a good sealing role. At the same time, the medium in the liquid storage chamber flows back to the pump inlet of the plunger metering pump through the leakage channel, so that the plunger sealing structure of the plunger metering pump has the same service life as the plunger metering pump.

[0016] The present invention arranges a left cooling chamber and a right cooling chamber on the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel arranged in the pump body. Coolant can be injected from the coolant inlet and discharged from the coolant outlet, so as to effectively and comprehensively cool the medium and the plunger moving pair at the same time. In order to increase the cooling effect, a plurality of annular grooves are arranged in the left cooling chamber, and a labyrinth-type coolant flow channel is arranged in the right cooling chamber, so as to increase the contact area between the coolant and the pump head, that is, to increase the heat dissipation area, thereby ensuring that the medium will not be vaporized due to the increase in temperature, and also ensuring that the plunger and the sealing ring will not be accelerated in wear due to the increase in temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 Middle AA section view;

[0019] Figure 3 for Figure 1 Middle BB section view;

[0020] In the figure: 1- plunger; 2- outer pressure cap; 3- inner pressure cap; 4- third lip seal ring; 5- third support ring; 6- O-ring; 7- liquid storage chamber; 8- second lip seal ring; 9- second support ring; 10- first lip seal ring; 11- first support ring; 12- pump head; 13- leakage channel; 14- pump inlet; 15- pump outlet; 16- left cooling chamber; 17- right cooling chamber; 18- sleeve; 19- pump head cooling cover; 20- coolant inlet; 21- coolant outlet; 22- cooling channel; 23- coolant flow channel. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings:

[0022] A double-seal fully cooled plunger pump head structure, the double-seal structure is as follows: a crimping component is arranged on the pump head 12, the plunger 1 is inserted into the crimping component, a two-stage sealing assembly is arranged between the plunger 1 and the pump head 12, the two-stage sealing assembly is composed of a primary sealing assembly and a secondary sealing assembly, a primary sealing assembly is arranged between the plunger and the pump head, a secondary sealing assembly is arranged between the plunger and the crimping component, the pump head, the plunger and the crimping component surround a liquid storage chamber 7, and the liquid storage chamber is located between the two-stage sealing assemblies.

[0023] Preferably, a leakage channel 13 connected to the liquid storage chamber 7 can be provided on the pump head 12, and the leakage channel 13 is connected to the pump inlet 14 of the pump head, so that the medium stored in the liquid storage chamber can flow back into the pump inlet, and the medium will not leak out of the pump. Compared with a structure with only a liquid storage chamber but no leakage channel, the service life of the metering pump of this structure is greatly increased, so that the plunger sealing structure of the plunger metering pump has the same service life as the plunger metering pump.

[0024] Preferably, both the two-stage sealing components use O-rings.

[0025] Preferably, both the two-stage sealing components use lip-type sealing rings, and the lip-type sealing rings are arranged in cooperation with the support rings.

[0026] Preferably, the crimping component can be provided as one or two, and the lip-shaped sealing ring and the supporting ring can also be provided as one or two sets.

[0027] The present invention adopts a two-stage sealing structure, and a liquid storage chamber is arranged between the two-stage sealing components. A leakage channel is arranged in the liquid storage chamber and connected to the pump inlet of the metering pump. This structure can ensure that the two-stage sealing structures play a sealing role in sequence, that is, when the first-stage sealing component loses its function, the leaked medium is stored in the liquid storage chamber, and the pressure in the liquid storage chamber is much lower than the pump pressure. In this way, the second-stage sealing component can play a good sealing role. At the same time, the medium in the liquid storage chamber flows back to the pump inlet of the plunger metering pump through the leakage channel, so that the plunger sealing structure of the plunger metering pump has the same service life as the plunger metering pump.

[0028] The full cooling structure is as follows: a left cooling chamber 16 and a right cooling chamber 17 are arranged on the pump head 12, the left cooling chamber is arranged on the pump head at the periphery of the friction pair formed by the plunger and the primary sealing assembly, the right cooling chamber is arranged at the right end of the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel 22 arranged in the pump body.

[0029] The left cooling chamber 16 is formed by a plurality of annular grooves (not marked in the figure) opened on the pump head and a sleeve 18. The sleeve 18 is arranged on the outer periphery of the plurality of annular grooves (for example, the sleeve is welded and arranged on the pump head), and a coolant outlet 21 is arranged on the sleeve; the right cooling chamber 17 is formed by a coolant flow channel 23 opened on the right end of the pump head and a pump head cooling cover 19. The coolant flow channel 23 can be set as a labyrinth structure, and the pump head cooling cover 19 is arranged outside the coolant flow channel 23 (for example, the pump head cooling cover is welded and arranged on the pump head), and a coolant inlet 20 is arranged on the pump head cooling cover 19; the coolant can be injected from the coolant inlet 20 and discharged from the coolant outlet 21, so that the medium and the plunger moving pair are effectively cooled in all directions at the same time.

[0030] When the plunger pump is working, the plunger 1 reciprocates left and right, and the medium enters from the pump inlet 14. Before being drawn out from the pump outlet 15, the coolant enters the right cooling chamber 17 from the coolant inlet 20, passes through the labyrinth coolant flow channel 23, enters the left cooling chamber 16 through the cooling channel 22, and is discharged from the coolant outlet 21 around multiple annular grooves, thereby effectively cooling the medium and the plunger kinematic pair in all directions at the same time.

[0031] The present invention arranges a left cooling chamber and a right cooling chamber on the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel arranged in the pump body. Coolant can be injected from the coolant inlet and discharged from the coolant outlet, so as to effectively and comprehensively cool the medium and the plunger moving pair at the same time. In order to increase the cooling effect, a plurality of annular grooves are arranged in the left cooling chamber, and a labyrinth-type coolant flow channel is arranged in the right cooling chamber, so as to increase the contact area between the coolant and the pump head, that is, to increase the heat dissipation area, so as to ensure that the medium will not be vaporized due to the increase in temperature, and also ensure that the plunger and the primary sealing component will not be accelerated in wear due to the increase in temperature. Example

[0032] This embodiment provides two crimping components, namely an inner pressure cap and an outer pressure cap; the first-level sealing component provides two sets of lip-type sealing rings and support rings, namely a first lip-type sealing ring, a first support ring, a second lip-type sealing ring, and a second support ring; the second-level sealing component provides one set of lip-type sealing rings and support rings, namely a third lip-type sealing ring and a third support ring; the full cooling structure remains unchanged.

[0033] Specifically, the first support ring, the first lip-shaped sealing ring, the second support ring and the second lip-shaped sealing ring are sequentially arranged in the limiting cavity of the pump head, the inner pressure cap is threadedly matched with the pump head and contacts the second lip-shaped sealing ring; the third support ring and the third lip-shaped sealing ring are sequentially arranged in the limiting cavity of the inner pressure cap, the outer pressure cap is threadedly matched with the inner pressure cap and contacts the third lip-shaped sealing ring; the plunger, the inner pressure cap and the pump head form a liquid storage cavity, and the liquid storage cavity is connected to the pump inlet of the metering pump through the leakage channel.

[0034] During installation, press the first support ring 11, the first lip seal ring 10, the second support ring 9, and the second lip seal ring 8 Figure 1 Install the O-ring 6 on the inner pressure cap 3 and screw it into the pump head 12, so that the inner pressure cap 3 contacts the second lip seal 8; press the third support ring 5 and the third lip seal 4 Figure 1Install the inner pressure cap 3 in sequence, and then screw in the outer pressure cap 2 so that the outer pressure cap 2 contacts the third lip-shaped sealing ring 4; insert the plunger 1, adjust the inner pressure cap 3, and under the joint action of the second support ring 9 and the first support ring 11, make the lip edges of the second lip-shaped sealing ring 8 and the first lip-shaped sealing ring 10 close to the plunger surface, blocking leakage and obtaining a sealing effect, i.e., the first-level sealing; adjust the outer pressure cap 2, and under the action of the third support ring 5, make the lip edge of the third lip-shaped sealing ring 4 close to the plunger surface, again achieving a sealing effect, i.e., the second-level sealing; at the same time, a liquid storage chamber 7 is formed between the inner pressure cap 3, the pump head 12 and the plunger 1, and a leakage channel 13 is provided on the pump head 12 to connect the liquid storage chamber 7, and the leakage channel 13 is connected to the pump inlet of the metering pump.

[0035] When the plunger pump is working, the plunger 1 reciprocates left and right, the medium enters from the pump inlet 14 and is drawn out from the pump outlet 15; under the combined action of the medium pressure, the lip edges of the second lip seal ring 8 and the first lip seal ring 10 are further pressed against the plunger surface, thereby enhancing the sealing effect.

[0036] When the first-stage sealing structure formed by the second lip-shaped sealing ring 8, the first lip-shaped sealing ring 10 and the plunger 1 loses its function, the leaked medium is stored in the liquid storage chamber 7, and the pressure in the liquid storage chamber 7 is much lower than the pump pressure, so that the second-stage sealing structure formed by the third lip-shaped sealing ring 4 and the plunger 1 can play a good sealing role. At the same time, the medium in the liquid storage chamber flows back to the pump inlet of the plunger metering pump through the leakage channel, so that the medium will not leak out of the pump. Compared with the structure with only a liquid storage chamber but no leakage channel, the service life of the metering pump with this structure is greatly increased, so that the plunger sealing structure of the plunger metering pump has the same service life as the plunger metering pump.

[0037] When the plunger pump is working, the plunger 1 reciprocates left and right, and the medium enters from the pump inlet 14. Before being drawn out from the pump outlet 15, the coolant enters the right cooling chamber from the coolant inlet, passes through the labyrinth coolant flow channel, enters the left cooling chamber through the cooling channel, and is discharged from the coolant outlet around multiple annular grooves, thereby effectively cooling the medium and the plunger kinematic pair in all directions at the same time.

Claims

1. A double-sealed fully cooled plunger pump head structure, characterized in that: A crimping component is arranged on the pump head, the plunger is inserted into the crimping component, a two-stage sealing component is arranged between the plunger and the pump head, the two-stage sealing component is composed of a primary sealing component and a secondary sealing component, a primary sealing component is arranged between the plunger and the pump head, a secondary sealing component is arranged between the plunger and the crimping component, the pump head, the plunger and the crimping component form a liquid storage cavity, and the liquid storage cavity is located between the two-stage sealing components; a left cooling chamber and a right cooling chamber are arranged on the pump head, the left cooling chamber is arranged on the pump head at the periphery of the friction pair formed by the plunger and the primary sealing component, the right cooling chamber is arranged at the right end of the pump head, and the left cooling chamber and the right cooling chamber are connected through a cooling channel arranged in the pump body; The pump head is provided with a drainage channel connected to the liquid storage cavity; The two-stage sealing components both use O-rings or lip-type sealing rings, and the lip-type sealing rings are arranged in cooperation with the support rings; The crimping component is composed of an inner pressure cap and an outer pressure cap, the primary sealing assembly is composed of a first support ring, a first lip-shaped sealing ring, a second support ring and a second lip-shaped sealing ring, the first support ring, the first lip-shaped sealing ring, the second support ring and the second lip-shaped sealing ring are sequentially arranged in the limiting cavity of the pump head, the inner pressure cap is threadedly matched with the pump head and contacts the second lip-shaped sealing ring; the secondary sealing assembly is composed of a third support ring and a third lip-shaped sealing ring, the third support ring and the third lip-shaped sealing ring are sequentially arranged in the limiting cavity of the inner pressure cap, the outer pressure cap is threadedly matched with the inner pressure cap and contacts the third lip-shaped sealing ring; the plunger, the inner pressure cap and the pump head form a liquid storage cavity; The leakage channel is communicated with the pump inlet of the pump head; The left cooling chamber is formed by a plurality of annular grooves and a sleeve provided on the pump head, and the sleeve is provided on the outer periphery of the plurality of annular grooves; The right cooling chamber is formed by a coolant flow channel opened at the right end of the pump head and a pump head cooling cover, and the pump head cooling cover is arranged outside the coolant flow channel.

2. A double-sealed fully-cooled plunger pump head structure according to claim 1, characterized in that The sleeve is welded and arranged on the pump head, and a coolant outlet is arranged on the sleeve.

3. A double-sealed fully cooled plunger pump head structure according to claim 1, characterized in that The pump head cooling cover is welded and arranged on the pump head, and a coolant inlet is arranged on the pump head cooling cover.

4. A double-sealed fully-cooled plunger pump head structure according to claim 1, characterized in that The coolant flow channel is a labyrinth structure.

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