Sealing mechanism of high-pressure plunger pump

Abstract

The utility model provides a sealing mechanism of a high-pressure plunger pump. The sealing mechanism comprises a medium V-shaped sealing group and a cooling water V-shaped sealing group which are arranged on the surface of a plunger of the high-pressure plunger pump in parallel. A cooling water cavity is formed in the side face of the cooling water V-shaped sealing set. And a leakage guiding chamber is arranged between the cooling water V-shaped sealing group and the medium V-shaped sealing group. The medium V-shaped sealing set comprises a medium sealing cylinder sleeve and a first V-shaped sealing ring set which is located in the medium sealing cylinder sleeve and used for sealing a medium solution. The cooling water V-shaped sealing set comprises a cooling water sealing cylinder sleeve, a second V-shaped sealing ring set, a third V-shaped sealing ring set and a fourth V-shaped sealing ring set, wherein the second V-shaped sealing ring set, the third V-shaped sealing ring set and the fourth V-shaped sealing ring set are located in the cooling water sealing cylinder sleeve and are sequentially arranged from the side close to the medium V-shaped sealing set. According to the sealing mechanism, Y-shaped sealing in an existing sealing mechanism is optimized into the V-shaped sealing set, and therefore the sealing effect of the sealing mechanism is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure plunger pump seals, and in particular relates to a sealing mechanism for a high-pressure plunger pump. Background Art

[0002] A nuclear power plant unit is equipped with multiple high-pressure three-piston crankshaft connecting rod plunger pumps. The sealing mechanism of the pump adopts a sealing structure composed of a V-shaped seal group and three Y-shaped seals. The V-shaped seal group consists of a pressure ring, 8 V-shaped seals and a support ring to prevent the high-pressure primary circuit medium from leaking into the leakage chamber. The two Y-shaped seal groups on the inner side of the cooling water sealing cylinder sleeve are placed in different directions and are mainly used for sealing between the cooling water chamber and the leakage chamber. The outermost Y-shaped seal prevents the cooling water from leaking out. This sealing form is a contact dynamic seal, and wear is inevitable.

[0003] During the operation of the unit, at least one pump is guaranteed to operate for a long time under high temperature, high pressure, high radiation and high frequency conversion conditions. Since the seal is prone to large deformation under such conditions, it causes abnormal wear of the seal, resulting in frequent medium leakage during the operation of the pump, shortening the maintenance cycle of the pump, which not only increases the maintenance cost, but also seriously affects the safe and reliable operation of the system. In addition, the case of using a plunger pump under such harsh conditions is very rare at home and abroad. How to ensure reliable sealing of the sealing component after long-term wear has become a global technical difficulty. Utility Model Content

[0004] In view of this, an embodiment of the utility model is dedicated to providing a sealing mechanism for a high-pressure plunger pump, which solves the problem of poor sealing effect of the existing sealing mechanism by optimizing the Y-shaped seal in the existing sealing mechanism into a V-shaped seal group.

[0005] The utility model provides a sealing mechanism for a high-pressure plunger pump, the sealing mechanism comprising a medium V-shaped sealing group and a cooling water V-shaped sealing group which are arranged on the plunger surface of the high-pressure plunger pump and are arranged in parallel. A cooling water chamber is arranged on the side of the cooling water V-shaped sealing group. A leakage guiding chamber is arranged between the cooling water V-shaped sealing group and the medium V-shaped sealing group. The medium V-shaped sealing group comprises a medium sealing cylinder sleeve and a first group of V-shaped sealing rings which are located in the medium sealing cylinder sleeve and are used to seal the medium solution. The cooling water V-shaped sealing group includes a cooling water sealing cylinder sleeve, a second group of V-shaped sealing rings, a third group of V-shaped sealing rings and a fourth group of V-shaped sealing rings located in the cooling water sealing cylinder sleeve and arranged in sequence from the side close to the medium V-shaped sealing group. The second group of V-shaped sealing rings and the third group of V-shaped sealing rings are used for sealing between the cooling water chamber and the leakage chamber, the fourth group of V-shaped sealing rings is used to prevent cooling water from leaking out, and the first group of V-shaped sealing rings, the second group of V-shaped sealing rings, the third group of V-shaped sealing rings and the fourth group of V-shaped sealing rings are all composed of multiple V-shaped sealing rings arranged in parallel.

[0006] In the above scheme, the Y-shaped seal in the existing sealing mechanism is optimized into a V-shaped sealing group, and multiple groups of V-shaped sealing groups are used to rely on the pre-tightening pressure filled in the sealing cavity and the pressure of the working medium to make the multiple V-shaped sealing rings in the V-shaped sealing group expand and deform. The lip edge of the V-shaped sealing ring sealing lip can completely fit with the plunger surface, thereby improving the sealing effect of the sealing mechanism, effectively extending the service life of the plunger seal, extending the continuous operation time of the equipment, improving the equipment operation reliability, and can effectively reduce the frequency of equipment maintenance, saving maintenance costs and labor costs.

[0007] In a specific embodiment of the present invention, the top ends of any two adjacent groups of V-shaped sealing rings in the first group, the second group, the third group and the fourth group have different directions.

[0008] In a specific implementation of the present invention, the first V-shaped sealing ring group is composed of 8 V-shaped sealing rings. The second V-shaped sealing ring group, the third V-shaped sealing ring group and the fourth V-shaped sealing ring group are each composed of 2 V-shaped sealing rings.

[0009] In a specific implementation of the utility model, the cooling water V-shaped seal group also includes a small gland and a spring support ring. The spring support ring is located between the third V-shaped seal ring group and the fourth V-shaped seal ring group and is used to buffer the pressing force of the small gland on the cooling water V-shaped seal group.

[0010] In a specific implementation of the utility model, the cooling water V-shaped sealing group also includes a first pressure ring, a bidirectional pressure ring, two first support rings and a first guide ring. The bidirectional pressure ring is located in the cooling water sealing cylinder sleeve and between the second group of V-shaped sealing rings and the third group of V-shaped sealing rings. One of the two first support rings abuts against the side of the second group of V-shaped sealing rings away from the bidirectional pressure ring, and the other of the two first support rings abuts against the side of the third group of V-shaped sealing rings away from the bidirectional pressure ring. The first pressure ring is located in the cooling water sealing cylinder sleeve and on the side of the fourth group of V-shaped sealing rings away from the third group of V-shaped sealing rings. The first guide ring is installed on the spring support ring.

[0011] In a specific implementation of the utility model, the medium V-shaped seal group also includes a spring sleeved on the outside of the medium sealing cylinder sleeve, and a water seal ring, a second pressure ring, a second support ring, a positioning ring and a second guide ring all located in the medium sealing cylinder sleeve. The second pressure ring is located on the side of the first V-shaped seal ring group close to the leakage chamber, the water seal ring is located on the side of the second pressure ring away from the first V-shaped seal ring group, the second support ring is located on the side of the first V-shaped seal ring group away from the leakage chamber, and the second guide ring is installed in the split positioning ring. The material and size of the second pressure ring and the second support ring match the working conditions of the high-pressure plunger pump.

[0012] In a specific implementation of the utility model, the cooling water V-shaped sealing group also includes a first O-ring and a second O-ring located in the sealing groove of the cooling water sealing cylinder sleeve; and / or, the medium V-shaped sealing group also includes a protective pad and a third O-ring located in the sealing groove of the medium sealing cylinder sleeve.

[0013] In a specific implementation of the present invention, the top of the V-shaped sealing ring is arc-shaped, and an elastic groove is provided at the top of the V-shaped groove of the V-shaped sealing ring. In a specific implementation of the present invention, the V-shaped angle of the V-shaped sealing ring is 90°. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of the assembly of a sealing mechanism of a high-pressure plunger pump provided by an embodiment of the utility model.

[0015] Figure 2 Shown is a schematic structural diagram of a V-shaped sealing ring in a sealing mechanism of a high-pressure plunger pump provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] At least one embodiment of the present utility model provides a sealing mechanism for a high-pressure plunger pump, such as Figure 1 As shown, the sealing mechanism includes a medium V-shaped sealing group 22 and a cooling water V-shaped sealing group 25 which are arranged on the surface of the plunger 21 of the high-pressure plunger pump and are arranged in parallel. A cooling water chamber 24 is provided on the side of the cooling water V-shaped sealing group 25, and a leakage chamber 23 is provided between the cooling water V-shaped sealing group 25 and the medium V-shaped sealing group 22. The medium V-shaped sealing group 22 includes a medium sealing cylinder sleeve 16 and a first group of V-shaped sealing ring groups 12a located in the medium sealing cylinder sleeve 16 and used to seal the medium solution. The cooling water V-shaped sealing group 25 includes a cooling water sealing cylinder sleeve 3, a second group of V-shaped sealing ring groups 12b, a third group of V-shaped sealing ring groups 12c and a fourth group of V-shaped sealing ring groups 12d which are located in the cooling water sealing cylinder sleeve 3 and are arranged in sequence from the side close to the medium V-shaped sealing group 22. The second group of V-shaped sealing ring groups 12b and the third group of V-shaped sealing ring groups 12c are used for sealing between the cooling water chamber and the leakage chamber. The fourth group of V-shaped sealing ring groups 12d are used to prevent cooling water from leaking out. The first V-shaped sealing ring group, the second V-shaped sealing ring group 12b, the third V-shaped sealing ring group 12c and the fourth V-shaped sealing ring group 12d are all composed of a plurality of V-shaped sealing rings arranged in parallel.

[0018] It should be noted that the number of the multiple V-shaped sealing rings included in each V-shaped sealing ring group can be set according to actual needs, and the embodiments of the present utility model do not specifically limit this. For example, in some embodiments, the first V-shaped sealing ring group is composed of 8 V-shaped sealing rings, and the second V-shaped sealing ring group 12b, the third V-shaped sealing ring group 12c and the fourth V-shaped sealing ring group 12d are all composed of 2 V-shaped sealing rings.

[0019] According to the technical solution provided by the embodiment of the utility model, the Y-shaped seal in the existing sealing mechanism is optimized into a V-shaped sealing group, and multiple groups of V-shaped sealing groups are used to rely on the pre-tightening pressure filled in the sealing cavity and the pressure of the working medium to make the multiple V-shaped sealing rings in the V-shaped sealing group expand and deform, and the lip edge of the V-shaped sealing ring sealing lip can be completely fitted with the plunger surface, thereby improving the sealing effect of the sealing mechanism, effectively extending the service life of the plunger seal, extending the continuous operation time of the equipment, and improving the reliability of equipment operation. It can also effectively reduce the frequency of equipment maintenance and save maintenance costs and labor costs. In addition, by arranging a cooling water chamber in the sealing mechanism, cooling water can be introduced into the cooling water chamber to achieve the effect of cooling and lubricating the plunger and the sealing ring. By arranging a leakage chamber in the sealing mechanism, it is possible to use the leakage chamber to monitor the leakage of the medium.

[0020] In the sealing mechanism of the high-pressure plunger pump provided in at least one embodiment of the utility model, the top ends of any two adjacent groups of V-shaped sealing rings in the first group of V-shaped sealing rings, the second group of V-shaped sealing rings 12b, the third group of V-shaped sealing rings 12c and the fourth group of V-shaped sealing rings 12d are oriented in different directions. In this way, by arranging any two adjacent groups of V-shaped sealing rings to be placed in different directions, the sealing performance of the sealing mechanism is further improved.

[0021] In the sealing mechanism of the high-pressure plunger pump provided in at least one embodiment of the utility model, the cooling water V-shaped sealing group 25 also includes a small pressure cover 1 and a spring support ring 4. The spring support ring is located between the third group of V-shaped sealing rings 12c and the fourth group of V-shaped sealing rings 12d, and is used to buffer the pressing force of the small pressure cover on the cooling water V-shaped sealing group 25. In this way, by adding a small pressure cover 1 and a spring support ring 4 on one side of the cooling water, after the small pressure cover 1 is threadedly locked and the spring support ring 4 inside, the three groups of V-shaped sealing rings (i.e., the second group of V-shaped sealing rings 12b, the third group of V-shaped sealing rings 12c and the fourth group of V-shaped sealing rings 12d) are subjected to a relatively uniform pre-tightening force, thereby cooperating with the plunger to generate contact stress to achieve sealing of the cooling water. The embodiment of the utility model utilizes the spring support ring 4 to effectively buffer the pressing force of the small pressure cover 1 on the cooling water V-shaped sealing group 25, so that the three groups of V-shaped sealing rings on the cooling water side are evenly stressed, thereby extending the service life of the V-shaped sealing rings and increasing the adjustment function of the compression amount of the V-shaped seal on the cooling water side.

[0022] In the sealing mechanism of the high-pressure plunger pump provided in at least one embodiment of the utility model, the cooling water V-shaped sealing group 25 also includes a first pressure ring 2, a bidirectional pressure ring 7, two first support rings 8 and a first guide ring 15a. The bidirectional pressure ring 7 is located in the cooling water sealing cylinder sleeve and between the second group of V-shaped sealing rings 12b and the third group of V-shaped sealing rings 12c, one of the two first support rings 8 abuts against the side of the second group of V-shaped sealing rings 12b away from the bidirectional pressure ring, and the other of the two first support rings abuts against the side of the third group of V-shaped sealing rings 12c away from the bidirectional pressure ring, the first pressure ring is located in the cooling water sealing cylinder sleeve and on the side of the fourth group of V-shaped sealing rings 12d away from the third group of V-shaped sealing rings 12c, and the first guide ring is installed on the spring support ring. Thus, by adding the first pressure ring 2, the bidirectional pressure ring 7, the two first support rings 8 and the first guide ring 15a in the cooling water V-shaped sealing group 25, the components in the cooling water V-shaped sealing group 25 are in full contact with each other, and the sealing performance of the sealing mechanism is further improved.

[0023] In the sealing mechanism of the high-pressure plunger pump provided in at least one embodiment of the present utility model, Figure 1 As shown, the medium V-shaped seal group 22 also includes a spring 17 sleeved on the outside of the medium sealing cylinder sleeve 16, and a water seal ring 10, a second pressure ring 11, a second support ring 13, a positioning ring 14 and a second guide ring 15b all located in the medium sealing cylinder sleeve 16. The second pressure ring 11 is located on the side of the first V-shaped seal ring group close to the leakage chamber 24, the water seal ring is located on the side of the second pressure ring away from the first V-shaped seal ring group, the second support ring is located on the side of the first V-shaped seal ring group away from the leakage chamber 24, and the second guide ring 15b is installed in the split positioning ring 14. The material and size of the second pressure ring 11 and the second support ring 13 match the working conditions of the high-pressure plunger pump. In this way, the second compression ring 11 and the second support ring 13 of different materials and matching sizes can be selected according to different working conditions of the high-pressure plunger pump, so as to optimize the second compression ring 11 and the second support ring 13, so that the second compression ring 11 and the second support ring 13 can better wrap the V-shaped sealing ring group, and can effectively prevent the creep extrusion of the V-shaped sealing ring group. In addition, the large gland 5 is threadedly locked with the cooling water sealing cylinder sleeve 3, and the pre-tightening force is transmitted to the medium V-shaped sealing group 22 through the end face of the cooling water sealing cylinder sleeve 3, so that the contact stress is generated between the first group of V-shaped sealing rings and the plunger, and the medium seal is realized.

[0024] In the sealing mechanism of the high-pressure plunger pump provided in at least one embodiment of the utility model, the cooling water V-shaped sealing group 25 further includes a first O-ring 6 and a second O-ring 9 located in the sealing groove of the cooling water sealing cylinder sleeve; and / or the medium V-shaped sealing group 22 further includes a protective pad 19 and a third O-ring 20 located in the sealing groove of the medium sealing cylinder sleeve 16. In this way, by arranging at least one O-ring in any sealing cylinder sleeve on the cooling water side and the medium side, the adjustment function of the compression amount of the sealing mechanism is further increased, thereby improving the service life of the sealing mechanism.

[0025] The structure of the V-shaped sealing ring can be optimized in shape and size according to different working conditions to obtain the most suitable V-shaped sealing ring, which is not specifically limited in the embodiment of the present utility model.

[0026] For example, in some embodiments, Figure 2 As shown, the top of the V-shaped sealing ring (i.e., position a) is in an arc shape, and an elastic groove c is provided at the top of the V-shaped groove b of the V-shaped sealing ring. Thus, by setting the top of the V-shaped sealing ring in an arc shape and processing an elastic groove at the top of the V-shaped groove of the V-shaped sealing ring, the stress of the V-shaped sealing ring is optimized, the deformation capacity and compensation amount of the V-shaped sealing ring are improved, and the service life of the V-shaped sealing ring is also extended.

[0027] For another example, in some other embodiments, the V-shaped angle of the V-shaped sealing ring can be adjusted to 90°. Thus, by optimizing the V-shaped angle of the V-shaped sealing ring, the V-shaped sealing ring can have better wrapping properties, further alleviating the creep extrusion of the sealing ring.

[0028] Next, combine Figure 1 The installation process of the high-pressure plunger pump provided in the embodiment of the utility model is illustrated by way of example.

[0029] 1 medium V-shaped seal group 22 assembly

[0030] 1.1 Install the protective pad 19 and the third O-ring 20 into the sealing groove of the medium sealing cylinder sleeve 16;

[0031] 1.2 Install the second guide ring 15b into the split positioning ring 14, and assemble it into the inside of the medium sealing cylinder sleeve 16 as a whole, so that the end surface of one side of the positioning ring 14 is tightly against the step of the medium sealing cylinder sleeve 16;

[0032] 1.3 In accordance with Figure 1 As shown, the second support ring 13, the first V-shaped sealing ring group 12a, the optimized second pressure ring 11 and the water seal ring 10 are sequentially installed into the medium sealing cylinder sleeve 16, and pressed hard during the reinstallation process to make the various components fully contact with each other and install them in place;

[0033] 1.4 Put the plunger 21 back into the medium sealing cylinder sleeve 16, and be careful not to touch the sealing lip of the V-shaped sealing ring when reinstalling;

[0034] 1.5 Put the spring 17 on the medium sealing cylinder sleeve 16. The medium V-shaped sealing group 22 is assembled.

[0035] 2 Assembly of cooling water V-shaped seal group 25

[0036] 2.1 Install the first O-ring 6 and the second O-ring 9 into the sealing groove of the cooling water sealing cylinder sleeve 3;

[0037] 2.2 Install a first support ring 8 into the cooling water sealing cylinder sleeve 3 so that it is tightly pressed against the inner bottom surface of the cooling water sealing cylinder sleeve 3;

[0038] 2.3 Install the second V-shaped sealing ring group 12b into the cooling water sealing cylinder sleeve 3 according to the direction shown in the figure, and make it close to a first supporting ring 8;

[0039] 2.4 Install the bidirectional pressure ring 7 into the cooling water sealing cylinder sleeve 3, and make it close to the second V-shaped sealing ring group 12b inside the cooling water sealing cylinder sleeve 3;

[0040] 2.5 Install the third V-shaped sealing ring group 12c into the cooling water sealing cylinder sleeve 3 according to the direction shown in the figure, and make its bidirectional pressure ring 7 close to the cylinder sleeve;

[0041] 2.6 Install the first guide ring 15a onto the spring support ring 4, and install the spring support ring 4 with the first guide ring 15a into the cooling water sealing cylinder sleeve 3, and make it close to the third V-shaped sealing ring group 12c inside the cooling water sealing cylinder sleeve 3;

[0042] 2.7 Install another first support ring 8 into the cooling water sealing cylinder sleeve 3, and make it close to the end surface of the spring support ring 4 inside the cooling water sealing cylinder sleeve 3;

[0043] 2.8 Install the fourth V-shaped sealing ring group 12d into the cooling water sealing cylinder sleeve 3 according to the direction shown in the figure, so that it is tightly pressed against the other first supporting ring 8;

[0044] 2.9 Install the first pressing ring 2 back into the cooling water sealing cylinder sleeve 3 and press it tightly to ensure that the components inside the cooling water sealing cylinder sleeve 3 are in full contact and installed in place;

[0045] 2.10 Reinstall the small gland 1 onto the cooling water sealing cylinder sleeve 3, and use a wrench to tighten the small gland 1. The cooling water V-shaped seal group 25 is assembled.

[0046] 3 Overall assembly

[0047] 3.1 Install the assembled medium V-shaped seal group 22 into the hydraulic cylinder body 18;

[0048] 3.2 Put the assembled cooling water V-shaped seal group 25 on the plunger 21 and install it back into the hydraulic cylinder body 18, so that the bottom end surface of the cooling water sealing cylinder sleeve 3 and the end surface of the water seal ring 10 are tightly pressed;

[0049] 3.3 Reinstall the large gland 5 onto the hydraulic cylinder body 18 and tighten the large gland 5 with a wrench.

[0050] At this point, the sealing mechanism of a high-pressure plunger pump is assembled.

[0051] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination recorded in the embodiments of the present invention or the combination recorded in the specific embodiments. All technical features recorded in the present invention can be freely combined or combined in any way unless there is a contradiction between them.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing mechanism for a high-pressure plunger pump, characterized in that: It includes a medium V-shaped seal group and a cooling water V-shaped seal group which are arranged on the plunger surface of the high-pressure plunger pump and are arranged in parallel. A cooling water chamber is provided on the side of the cooling water V-shaped sealing group, and a leakage chamber is provided between the cooling water V-shaped sealing group and the medium V-shaped sealing group. The medium V-shaped sealing group includes a medium sealing cylinder sleeve and a first group of V-shaped sealing rings located in the medium sealing cylinder sleeve and used for sealing the medium solution. The cooling water V-shaped sealing group includes a cooling water sealing cylinder sleeve, a second group of V-shaped sealing rings, a third group of V-shaped sealing rings and a fourth group of V-shaped sealing rings located in the cooling water sealing cylinder sleeve and arranged in sequence from the side close to the medium V-shaped sealing group. The second group of V-shaped sealing rings and the third group of V-shaped sealing rings are used for sealing between the cooling water chamber and the leakage chamber. The fourth group of V-shaped sealing rings is used to prevent cooling water from leaking out. The first group of V-shaped sealing rings, the second group of V-shaped sealing rings, the third group of V-shaped sealing rings and the fourth group of V-shaped sealing rings are all composed of multiple V-shaped sealing rings arranged in parallel.

2. The sealing mechanism according to claim 1, characterized in that: The top ends of any two adjacent groups of V-shaped sealing rings among the first group of V-shaped sealing rings, the second group of V-shaped sealing rings, the third group of V-shaped sealing rings and the fourth group of V-shaped sealing rings are oriented in different directions.

3. The sealing mechanism according to claim 1, characterized in that: The first V-shaped sealing ring group is composed of 8 V-shaped sealing rings, and the second V-shaped sealing ring group, the third V-shaped sealing ring group and the fourth V-shaped sealing ring group are each composed of 2 V-shaped sealing rings.

4. The sealing mechanism according to claim 1, characterized in that: The cooling water V-shaped seal group also includes a small gland and a spring support ring. The spring support ring is located between the third group of V-shaped sealing rings and the fourth group of V-shaped sealing rings, and is used to buffer the pressing force of the small pressure cover on the cooling water V-shaped sealing group.

5. The sealing mechanism according to claim 4, characterized in that: The cooling water V-shaped sealing group also includes a first pressure ring, a bidirectional pressure ring, two first support rings and a first guide ring. Wherein, the bidirectional pressure ring is located in the cooling water sealing cylinder sleeve and between the second group of V-shaped sealing rings and the third group of V-shaped sealing rings, one of the two first support rings abuts against the side of the second group of V-shaped sealing rings away from the bidirectional pressure ring, and the other of the two first support rings abuts against the side of the third group of V-shaped sealing rings away from the bidirectional pressure ring, the first pressure ring is located in the cooling water sealing cylinder sleeve and on the side of the fourth group of V-shaped sealing rings away from the third group of V-shaped sealing rings, and the first guide ring is installed on the spring support ring.

6. The sealing mechanism according to claim 1, characterized in that: The medium V-shaped seal group also includes a spring sleeved on the outside of the medium sealing cylinder sleeve, and a water seal ring, a second pressure ring, a second support ring, a positioning ring and a second guide ring all located in the medium sealing cylinder sleeve. Among them, the second pressure ring is located on the side of the first group of V-shaped sealing rings close to the leakage guide chamber, the water seal ring is located on the side of the second pressure ring away from the first group of V-shaped sealing rings, the second support ring is located on the side of the first group of V-shaped sealing rings away from the leakage guide chamber, and the second guide ring is installed in the split positioning ring. The material and size of the second pressure ring and the second support ring match the working conditions of the high-pressure plunger pump.

7. The sealing mechanism according to claim 1, characterized in that: The cooling water V-shaped seal assembly further comprises a first O-ring and a second O-ring located in a seal groove of the cooling water seal cylinder sleeve; and / or The medium V-shaped seal group also includes a protective pad and a third O-ring located in the sealing groove of the medium sealing cylinder sleeve.

8. The sealing mechanism according to any one of claims 1 to 7, characterized in that: The top of the V-shaped sealing ring is in an arc shape, and an elastic groove is provided on the top of the V-shaped groove of the V-shaped sealing ring.

9. The sealing mechanism according to any one of claims 1 to 7, characterized in that: The V-shaped angle of the V-shaped sealing ring is 90°.

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