Double-layer high-pressure cylinder and plunger pump

Abstract

The utility model relates to the field of high-pressure cylinders, in particular to a double-layer high-pressure cylinder and a plunger pump, the double-layer high-pressure cylinder comprises a cylinder body, a cylinder sleeve and a lining, the cylinder body is used for being connected to a pump head, the cylinder sleeve is embedded in the cylinder body, the lining is embedded in the cylinder sleeve, a plunger extends into the lining, the lining is provided with a pressure relief hole, a flow groove and a communicating hole, and the pressure relief hole penetrates through the inner periphery and the outer periphery of the lining; the flow groove is located in the peripheral surface of the lining and communicates with the pressure relief hole, the communicating hole penetrates through the inner periphery and the outer periphery of the lining and communicates with the flow groove, and the communicating hole is used for directly facing the peripheral surface of the plunger. The cylinder body and the cylinder sleeve are processed in a split mode, the wall thickness of a single part is reduced, and manufacturing defects are reduced. In addition, the cylinder body and the cylinder sleeve can be made of different materials so as to meet the requirements for cost and strength at the same time. Under the condition that the plunger goes deep to output high-pressure water, trace high-pressure water flows into a gap between the cylinder sleeve and the plunger, the high-pressure water flows through the pressure relief hole to reduce pressure, the low-pressure water is not prone to going deep into the gap between the cylinder sleeve and the plunger, and leakage is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the field of high-pressure cylinders, in particular to a double-layer high-pressure cylinder and a plunger pump. BACKGROUND

[0002] The file with the existing publication number CN108087263A discloses a pulsation-adjustable plunger pump, which comprises a pump body and a pump head, a crankshaft is arranged in the pump body, the crankshaft is connected with a plunger through a connecting rod, the pump head is connected to the pump body, and the plunger extends into a plunger cavity in the pump head.

[0003] Generally, the common forming mode of the pump head includes powder metallurgy and casting. That is, the pump head blank is integrally formed, and then the pump head product is obtained through machining (turning, boring, etc.), heat treatment and surface treatment and other processes.

[0004] The pump head blank is integrally formed (cast), and manufacturing defects may exist in the pump head, which affects the strength of the pump head. CONTENT OF THE UTILITY MODEL

[0005] In order to improve the strength, the application provides a double-layer high-pressure cylinder plunger pump.

[0006] In the first aspect, the application provides a double-layer high-pressure cylinder, which adopts the following technical scheme:

[0007] The double-layer high-pressure cylinder comprises a cylinder body and a cylinder sleeve,

[0008] The cylinder body is used for being connected to the pump head,

[0009] The cylinder sleeve is embedded in the cylinder body, and the cylinder sleeve is used for allowing the plunger to extend into.

[0010] Through the above technical scheme, the cylinder body and the cylinder sleeve are processed separately, the wall thickness of a single part is reduced, and manufacturing defects are reduced. In addition, the cylinder body and the cylinder sleeve can be made of different materials to meet the requirements of cost and strength at the same time.

[0011] Preferably, one end surface of the cylinder body is provided with an embedding hole, and the cylinder sleeve is embedded in the embedding hole,

[0012] The other end surface of the cylinder body is provided with a mounting hole,

[0013] The outer peripheral surface of the cylinder body is provided with a cooling port, and the cooling port is communicated to the mounting hole.

[0014] Through the above technical scheme, during the operation of the plunger pump, the plunger is continuously rubbed to generate heat, cooling liquid is injected through the cooling port, and the cooling liquid is used to take away the heat.

[0015] Preferably, the application further comprises a mounting ring,

[0016] The mounting ring is embedded in the mounting hole, the mounting ring is provided with a cooling hole and a cooling groove, the cooling hole penetrates the inner and outer periphery of the mounting ring, the cooling groove is located at the outer peripheral surface of the mounting ring, the cooling groove is communicated with the cooling hole, and the cooling groove is opposite to the cooling port,

[0017] The mounting ring is used for embedding the plunger.

[0018] By adopting the above technical scheme, the flow direction of the cooling liquid is controlled; at the same time, the cooling liquid is used to cool the plunger and the mounting ring.

[0019] Preferably, a sealing ring is further included,

[0020] The sealing ring is located on the side of the cooling hole away from the embedded hole, and the sealing ring is used to be embedded between the mounting ring and the plunger.

[0021] By adopting the above technical scheme, the leakage of the cooling liquid is avoided.

[0022] Preferably, the cooling groove penetrates one end of the mounting ring, and one end of the mounting ring is attached to one end of the cylinder sleeve.

[0023] By adopting the above technical scheme, the cooling liquid also contacts the cylinder sleeve, and cooling of the cylinder sleeve is realized.

[0024] Preferably, a bushing is further included,

[0025] The bushing is embedded in the cylinder sleeve, and the bushing is used for the plunger to extend into.

[0026] By adopting the above technical scheme, the cylinder sleeve can be made of wear-resistant material, and the service life is improved.

[0027] Preferably, the bushing is provided with a pressure relief hole, a flow groove and a communication hole,

[0028] The pressure relief hole penetrates the inner and outer periphery of the bushing,

[0029] The flow groove is located at the outer peripheral surface of the bushing, and the flow groove is communicated with the pressure relief hole,

[0030] The communication hole penetrates the inner and outer periphery of the bushing, the communication hole is communicated with the flow groove, and the communication hole is used to be opposite to the outer peripheral surface of the plunger.

[0031] By adopting the above technical scheme, in the case that the plunger is deeply inserted to output high-pressure water, a small amount of high-pressure water flows into the gap between the cylinder sleeve and the plunger, the high-pressure water flows through the pressure relief hole to reduce the pressure, and the low-pressure water is not easy to continue to deeply enter the gap between the cylinder sleeve and the plunger, thereby reducing the leakage.

[0032] Preferably, a sealing sleeve is further included,

[0033] The sealing sleeve is embedded in the cylinder sleeve, and the sealing sleeve is used to fit to one end of the bushing and the outer periphery of the plunger.

[0034] By adopting the above technical scheme, the sealing between the plunger and the cylinder sleeve is improved.

[0035] In a second aspect, the application provides a plunger pump, which adopts the following technical scheme:

[0036] A plunger pump comprises the double-layer high-pressure cylinder.

[0037] In summary, the application has at least one of the following beneficial technical effects:

[0038] 1. The cylinder body and the cylinder sleeve are processed separately, the wall thickness of a single part is reduced, manufacturing defects are reduced, and the cylinder body and the cylinder sleeve can be made of different materials to meet the cost and strength requirements at the same time.

[0039] 2. During the operation of the plunger pump, heat is generated by continuous friction of the plunger, cooling liquid is injected through the cooling port, and the cooling liquid carries away the heat.

[0040] 3. When the plunger is deeply inserted to output high-pressure water, a small amount of high-pressure water flows into the gap between the cylinder sleeve and the plunger, the high-pressure water flows through the pressure relief hole to reduce the pressure, and the low-pressure water is not easy to continue to flow into the gap between the cylinder sleeve and the plunger, thereby reducing leakage. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of a double-layer high-pressure cylinder.

[0042] Figure 2 is a sectional view of a double-layer high-pressure cylinder.

[0043] Figure 3 is a structural schematic diagram of a bushing.

[0044] Reference signs: 1, cylinder body; 11, embedded hole; 12, mounting hole; 13, cooling port; 2, cylinder sleeve; 3, mounting ring; 31, cooling hole; 32, cooling groove; 41, sealing ring; 42, gasket; 43, snap spring; 5, bushing; 51, pressure relief hole; 52, flow groove; 53, communication hole; 6, sealing sleeve. DETAILED DESCRIPTION

[0045] The application will be further described in detail below with reference to the accompanying drawings.

[0046] Reference Figure 1 and Figure 2 The application discloses a double-layer high-pressure cylinder, which comprises a cylinder body 1, a cylinder sleeve 2 and a mounting ring 3,

[0047] The cylinder body 1 is used to connect to the pump head. One end surface of the cylinder body 1 is provided with an embedding hole 11, and the cylinder sleeve 2 is embedded in the embedding hole 11 in an interference fit. The other end surface of the cylinder body 1 is provided with a mounting hole 12, and the inner diameter of the mounting hole 12 is larger than the inner diameter of the embedding hole 11. A mounting ring 3 is screwed into the mounting hole 12, and the inner diameter of the mounting ring 3 is smaller than the inner diameter of the cylinder sleeve 2.

[0048] The outer peripheral surface of the cylinder body 1 is provided with a cooling port 13, and the cooling port 13 penetrates the cylinder body 1 in the radial direction. The cooling port 13 is communicated to the mounting hole 12.

[0049] The mounting ring 3 is provided with a cooling hole 31 and a cooling groove 32. The cooling hole 31 penetrates the inner and outer periphery of the mounting ring 3, and a plurality of cooling holes 31 are arranged in the circumferential direction of the mounting ring 3.

[0050] The cooling groove 32 is located at the outer peripheral surface of the mounting ring 3, and the cooling groove 32 penetrates the mounting ring 3 towards the end surface of the bushing 5. The cooling groove 32 is communicated to the cooling hole 31, and the cooling groove 32 is opposite to the cooling port 13.

[0051] In the drawings of the embodiment, one end of the mounting ring 3 is chamfered to form the cooling groove 32, and the one end of the mounting ring 3 is fitted to the cylinder sleeve 2. The axis of the cooling hole 31 is not perpendicular to the axis of the mounting ring 3.

[0052] Referring to Figure 2 , the double-layer high-pressure cylinder further comprises a sealing ring 41, a gasket 42 and a circlip 43.

[0053] The sealing ring 41 and the gasket 42 are embedded at the inner periphery of the mounting ring 3, and the gasket 42 is located on the side of the sealing ring 41 away from the cylinder sleeve 2. The circlip 43 is connected to the mounting ring 3, and the circlip 43 is located on the side of the gasket 42 away from the sealing ring 41, so as to realize the mutual fixation between the sealing ring 41, the gasket 42 and the circlip 43 and the mounting ring 3.

[0054] Referring to Figure 2 and Figure 3 , the double-layer high-pressure cylinder further comprises a bushing 5 and a sealing sleeve 6.

[0055] The bushing 5 is embedded in the cylinder sleeve 2. The bushing 5 is provided with a pressure relief hole 51, a flow groove 52 and a communication hole 53. The pressure relief hole 51 penetrates the inner and outer periphery of the bushing 5. The flow groove 52 is located at the outer peripheral surface of the bushing 5, and the flow groove 52 penetrates the bushing 5 towards the end surface of the mounting ring 3. The flow groove 52 is communicated to the pressure relief hole 51. The communication hole 53 penetrates the inner and outer periphery of the bushing 5, and the communication hole 53 is communicated to the flow groove 52. The communication hole 53 is located between the pressure relief hole 51 and the mounting ring 3.

[0056] The sealing sleeve 6 is embedded in the cylinder sleeve 2, and the sealing sleeve 6 is located between the bushing 5 and the mounting ring 3.

[0057] In use, one end of the plunger penetrates into the bushing 5 through the sealing ring 41 and the sealing sleeve 6 in sequence; the sealing ring 41 and the sealing sleeve 6 are tightly attached to the outer surface of the plunger to realize sealing; the other end of the plunger is located outside the mounting ring 3.

[0058] The implementation principle of the double-layer high-pressure cylinder in the embodiment of the application is as follows: the cylinder body 1 and the cylinder sleeve 2 are processed separately, the wall thickness of a single part is reduced, and manufacturing defects are reduced. In addition, the cylinder body 1 and the cylinder sleeve 2 can be made of different materials to simultaneously meet the cost and strength requirements.

[0059] The embodiment of the application further discloses a plunger pump, which comprises the double-layer high-pressure cylinder.

[0060] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A double-layer high-pressure cylinder, characterized in that, It includes the cylinder block (1), cylinder liner (2) and bushing (5). The cylinder (1) is used to connect to the pump head, and one end surface of the cylinder (1) is provided with a recessed hole (11). The cylinder liner (2) is fitted into the mounting hole (11). The bushing (5) is embedded in the cylinder liner (2) and is used for the plunger to extend into.

2. The double-layer high-pressure cylinder according to claim 1, characterized in that, The other end surface of the cylinder (1) is provided with a mounting hole (12). The outer peripheral surface of the cylinder (1) is provided with a cooling port (13), which is connected to the mounting hole (12).

3. The double-layer high-pressure cylinder according to claim 2, characterized in that, It also includes the mounting ring (3). The mounting ring (3) is embedded in the mounting hole (12). The mounting ring (3) is provided with a cooling hole (31) and a cooling groove (32). The cooling hole (31) penetrates the inner and outer circumferences of the mounting ring (3). The cooling groove (32) is located on the outer circumferential surface of the mounting ring (3). The cooling groove (32) is connected to the cooling hole (31). The cooling groove (32) is directly opposite the cooling port (13). The mounting ring (3) is used for the insertion of the plunger.

4. The double-layer high-pressure cylinder according to claim 3, characterized in that, It also includes a sealing ring (41). The sealing ring (41) is located on the side of the cooling hole (31) away from the insertion hole (11), and the sealing ring (41) is used to be inserted between the mounting ring (3) and the plunger.

5. The double-layer high-pressure cylinder according to claim 3, characterized in that, The cooling groove (32) passes through one end of the mounting ring (3), and one end of the mounting ring (3) is attached to one end of the cylinder liner (2).

6. The double-layer high-pressure cylinder according to claim 1, characterized in that, The bushing (5) is provided with a pressure relief hole (51), a flow channel (52) and a connecting hole (53). The pressure relief hole (51) penetrates the inner and outer circumferences of the bushing (5). The flow channel (52) is located on the outer peripheral surface of the bushing (5), and the flow channel (52) is connected to the pressure relief hole (51). The connecting hole (53) penetrates the inner and outer circumferences of the bushing (5), the connecting hole (53) is connected to the flow channel (52), and the connecting hole (53) is used to face the outer circumferential surface of the plunger.

7. The double-layer high-pressure cylinder according to claim 6, characterized in that, It also includes a sealing sleeve (6). The sealing sleeve (6) is embedded in the cylinder liner (2). The sealing sleeve (6) is used to fit one end of the bushing (5) and to fit the outer periphery of the plunger.

8. A plunger pump, characterized in that, Includes the double-layer high-pressure cylinder as described in any one of claims 1-7.

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