A plunger pump and its self-cooling plunger cylinder structure

Abstract

The present invention provides a self-cooling plunger pump cylinder body, including a cylinder body, wherein a working chamber, a water outlet high pressure chamber and a water inlet chamber are arranged in the cylinder body; the working chamber includes a plunger chamber and a water passage chamber, and the water outlet high pressure chamber and the water inlet chamber are respectively connected with the water passage chamber; a first mounting groove connected with the plunger chamber is provided on one side of the cylinder body; a flow regulating valve is arranged in the first mounting groove for adjusting the flow size of the mounting groove; a high pressure water channel for connecting the water outlet high pressure chamber and the first mounting groove is also arranged in the cylinder body; the plunger chamber and the water inlet chamber are connected through a cooling water reflux channel. The present invention has a self-cooling function.

Description

Technical Field

[0001] The invention relates to a plunger pump, in particular to a plunger pump and a self-cooling plunger cylinder structure thereof. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve liquid suction and liquid pressure. The seal in the sealed chamber plays a vital role in the performance of the plunger pump. The friction between the plunger and the seal during the reciprocating motion will generate a lot of heat. In order to avoid the water seal from being burned, the current common technical means is to set a main and auxiliary water seal inside the plunger pump cylinder, open a channel connected to the water inlet of the water pump between the main and auxiliary water seals, and introduce low-pressure water to cool the water seal. The main water seal seals the high-pressure water in the sealing chamber, and the auxiliary water seal seals the cooling water, but this solution has obvious defects, because when the plunger pump uses self-priming water inlet, the cooling water will also be sucked into the working chamber. At this time, the water seal will lose water cooling. In addition, due to the negative pressure formed by the plunger suction, the bubbles dissolved in the cooling water will precipitate and cause cavitation, damaging the seal and the cylinder. Summary of the invention

[0003] In view of this, the first object of the present invention is to provide a cylinder structure with a self-cooling function.

[0004] In order to achieve the above object, the technical solution of the present invention is:

[0005] A self-cooling plunger cylinder structure comprises a cylinder body, wherein a working chamber, a water outlet high-pressure chamber and a water inlet chamber are arranged in the cylinder body; the working chamber comprises a plunger chamber and a water passage chamber, and the water outlet high-pressure chamber and the water inlet chamber are respectively connected with the water passage chamber; a first mounting groove connected with the plunger chamber is opened on one side of the cylinder body; a flow regulating valve is arranged in the first mounting groove for adjusting the flow size of the first mounting groove; a high-pressure water channel for connecting the water outlet high-pressure chamber and the first mounting groove is also arranged in the cylinder body; the plunger chamber and the water inlet chamber are connected through a cooling water reflux channel.

[0006] Preferably, the working chamber, the water outlet high pressure chamber and the water inlet chamber are each arranged in parallel in plurality;

[0007] The first mounting groove is communicated with the rightmost plunger cavity, and adjacent plunger cavities are communicated with each other through a cooling channel arranged in the cylinder body; the cooling water reflux channel is communicated with the leftmost plunger cavity.

[0008] Preferably, the cylinder body is further provided with a second mounting groove connected to the leftmost plunger chamber, and a pressure gauge is provided in the second mounting groove.

[0009] Preferably, a water outlet one-way valve is provided between the water outlet high-pressure chamber and the working chamber; and a water inlet one-way valve is provided between the water inlet chamber and the working chamber.

[0010] Preferably, a water seal assembly is arranged in the plunger cavity, and the water seal assembly includes a main water seal, a water ring, a secondary water seal and a secondary water seal seat which are arranged in sequence; the side wall of the water ring is provided with a radial water hole; an annular gap is formed between the outer wall of the water ring and the inner wall of the plunger cavity and corresponding to the position of the connection between the cooling water reflux channel, the cooling channel and the first mounting groove and the plunger cavity.

[0011] Preferably, a sealing ring is nested in the outer side wall of the auxiliary water seal seat.

[0012] Preferably, a plurality of water holes are arranged along the circumference of the water ring.

[0013] Preferably, the inner diameter of the water ring is smaller than the outer diameter of the plunger.

[0014] A second object of the present invention is to provide a plunger pump having a self-cooling function.

[0015] In order to achieve the above object, the technical solution of the present invention is:

[0016] A plunger pump comprises a crankcase and the self-cooling plunger cylinder structure described in the above scheme.

[0017] The technical effects of the present invention are mainly reflected in the following aspects:

[0018] By setting a high-pressure water channel at the water outlet high-pressure chamber of the cylinder body, cooling water is input to the area between the main and auxiliary water seals through the flow control valve to cool the water seal. At this time, the cooling water has a lower positive pressure to prevent water shortage and cavitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A side sectional view of the cylinder structure in the embodiment;

[0020] Figure 2 It is a partial cross-sectional view of the cylinder structure in the embodiment;

[0021] Figure 3 It is a longitudinal sectional view of the cylinder structure in the embodiment.

[0022] Figure numerals: 1. cylinder body; 2. water inlet chamber; 3. high-pressure water outlet chamber; 4. water passage chamber; 5. plunger chamber; 6. water inlet check valve; 7. water outlet check valve; 8. main water seal; 9. water passage ring; 10. auxiliary water seal; 11. auxiliary water seal seat; 12. water passage hole; 13. cooling channel; 14. high-pressure water channel; 15. first mounting groove; 16. flow regulating valve; 161. valve seat; 162. valve core; 17. second mounting groove; 18. pressure gauge; 19. first ring platform; 20. second ring platform; 21. cooling water reflux channel; 22. annular gap. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Example

[0024] Reference Figure 1-Figure 3 This embodiment provides a self-cooling plunger cylinder structure, including a cylinder 1, in which a working chamber, a water outlet high pressure chamber and a water inlet chamber 2 are arranged; a plurality of working chambers, water outlet high pressure chambers and water inlet chambers 2 are arranged side by side, and three are shown in the figure, that is, suitable for a three-cylinder plunger pump. A water outlet check valve 7 is arranged between the water outlet high pressure chamber and the working chamber; a water inlet check valve 6 is arranged between the water inlet chamber 2 and the working chamber.

[0025] A water seal assembly is arranged in the plunger cavity 5, and the water seal assembly includes a main water seal 8, a water ring 9, a secondary water seal 10 and a secondary water seal seat 11 arranged in sequence, and the arrangement direction is from one end of the plunger cavity 5 toward the water chamber 4 to the end away from the water chamber 4. More specifically, the plunger cavity 5 is provided with two-level ring platforms along the above arrangement direction, namely, a first ring platform 19 and a second ring platform 20, wherein the outer diameter of the first ring platform 19 is the same as the inner diameter of the second ring platform 20. During installation, the main water seal 8 is first inserted into the opening at the other end of the plunger cavity 5 and abutted against the first ring platform 19, and then the water ring 9 is inserted into and abutted against the main water seal 8, and then the secondary water seal 10 is sleeved on the secondary water seal seat 11 and then inserted together and abutted against the water ring 9. A sealing ring is nested in the outer wall of the secondary water seal seat 11 to prevent water leakage. It is worth noting that the inner diameter of the water ring 9 is larger than the inner diameter of the plunger, so that there is a gap between the water ring 9 and the plunger.

[0026] In addition, a cooling water reflux channel 21 is provided in the cylinder body 1 and between the second ring platform 20 and the water inlet chamber 2 , so that the cooling water reflux channel 21 passes between the leftmost plunger chamber 5 and the water inlet chamber 2 .

[0027] The above-mentioned working chamber includes two connected parts, namely the plunger chamber 5 and the water passage chamber 4. The water outlet high-pressure chamber and the water inlet chamber 2 are respectively located at the upper and lower sides of the water passage chamber 4, and are both connected to the water passage chamber 4.

[0028] A first mounting groove 15 connected to the rightmost plunger cavity 5 is provided on one side of the cylinder body 1, and the axis of the first mounting groove 15 is perpendicular to the plunger cavity 5. A high-pressure water channel 14 for connecting the water outlet high-pressure chamber and the first mounting groove 15 is also provided inside the cylinder body 1; in addition, a flow regulating valve 16 is provided in the first mounting groove 15 for adjusting the flow rate of the first mounting groove 15, that is, adjusting the flow rate of the cooling water in the high-pressure water channel 14 entering the plunger cavity 5. In addition, adjacent plunger cavities 5 are connected through the cooling channel 13 provided in the cylinder body 1, so that the cooling water can enter each plunger cavity 5. Since the leftmost plunger cavity 5 is connected to the water inlet cavity 2, the cooling water can return to the water inlet cavity 2 after passing through the leftmost plunger cavity 5.

[0029] A second mounting groove 17 connected to the leftmost plunger cavity 5 is also provided in the cylinder body 1. The axis of the second mounting groove 17 is perpendicular to the plunger cavity 5, and a pressure gauge 18 is provided in the second mounting groove 17 to facilitate users to check the water pressure of the space where the cooling water is located.

[0030] The side wall of the water ring 9 is provided with a plurality of radial water holes along the circumferential direction, and an annular gap 22 is formed between the outer wall of the water ring 9 and the inner wall of the plunger cavity 5 and at a position corresponding to the connection between the cooling water reflux channel 21, the cooling channel 13 and the first mounting groove 15 and the plunger cavity 5.

[0031] The flow regulating valve 16 includes a valve seat 161 and a valve core 162 . The valve seat 161 is installed at the bottom of the first installation groove 15 .

[0032] The working principle of this embodiment is as follows: water is sucked into the working chamber through the water inlet check valve 6 by the plunger that is withdrawn from the water inlet. When a single plunger is pushed forward, the water is squeezed and becomes a high-pressure fluid, and enters the water outlet high-pressure chamber through the water outlet check valve 7. Most of the water flows out through the water outlet, and part of the water flows into the flow control valve through the high-pressure water channel 14. The flow control valve is composed of a valve core 162 and a valve seat 161. The valve core 162 is connected to the cylinder body 1 by threads. By rotating the valve core 162, the opening size of the valve core 162 and the valve seat 161 can be changed to achieve the function of controlling the flow. Since the water flow area formed by the annular gap 22 between the main and auxiliary water seals 10 is much larger than the opening area of ​​the flow control valve, the high-pressure fluid pressure passing through the flow control valve is released and only a lower positive pressure is retained. The cooling water flows from the rightmost plunger chamber 5 through the water cooling channel into the cooling water reflux channel 21 in the leftmost plunger chamber 5, and returns to the water inlet to form a cycle. Example

[0033] This embodiment provides a plunger pump, including a crankcase and the self-cooling plunger pump cylinder body of the first embodiment.

[0034] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A self-cooling cylinder structure of a plunger pump, suitable for a plunger pump, the cylinder (1) structure comprising a cylinder (1), wherein the cylinder (1) is provided with a working chamber, a water outlet high pressure chamber and a water inlet chamber (2); the working chamber comprises a plunger chamber (5) and a water passage chamber (4), the water outlet high pressure chamber and the water inlet chamber (2) are respectively connected to the water passage chamber (4); wherein the self-cooling cylinder structure of a plunger pump is suitable for a plunger pump, wherein the cylinder (1) comprises a cylinder (1), wherein the cylinder (1) is provided with a working chamber, a water outlet high pressure chamber and a water inlet chamber (2); the working chamber comprises a plunger chamber (5) and a water passage chamber (4), the water outlet high pressure chamber and the water inlet chamber (2) are respectively connected to the water passage chamber (4); wherein the self-cooling cylinder structure of a plunger pump is suitable for a plunger pump, wherein the self-cooling cylinder structure of a plunger pump is suitable for a plunger pump A first mounting groove (15) communicating with the plunger cavity (5) is provided on one side of the cylinder body (1); a flow regulating valve (16) is provided in the first mounting groove (15) for adjusting the flow rate of the first mounting groove (15); a high-pressure water channel (14) for communicating the water outlet high-pressure chamber with the first mounting groove (15) is also provided in the cylinder body (1); the plunger cavity (5) is communicated with the water inlet cavity (2) via a cooling water return channel (21); A plurality of water outlet high pressure chambers and a plurality of water inlet chambers (2) are arranged side by side; The first mounting groove (15) is in communication with the rightmost plunger cavity (5), and adjacent plunger cavities (5) are in communication with each other via a cooling channel (13) provided in the cylinder body (1); the cooling water return channel (21) is in communication with the leftmost plunger cavity (5).

2. A self-cooling cylinder structure of a plunger pump according to claim 1, characterized in that: The cylinder body (1) is also provided with a second mounting groove (17) communicating with the leftmost plunger cavity (5), and a pressure gauge (18) is provided in the second mounting groove (17).

3. The self-cooling cylinder structure of a plunger pump according to claim 1, characterized in that: A water outlet one-way valve (7) is provided between the water outlet high pressure chamber and the working chamber; and a water inlet one-way valve (6) is provided between the water inlet chamber (2) and the working chamber.

4. The self-cooling cylinder structure of a plunger pump according to claim 1, characterized in that: A water seal assembly is arranged in the plunger cavity (5), and the water seal assembly comprises a main water seal (8), a water ring (9), a secondary water seal (10) and a secondary water seal seat (11) which are arranged in sequence; a radial water hole (12) is arranged on the side wall of the water ring (9); an annular gap (22) is formed between the outer wall of the water ring (9) and the inner wall of the plunger cavity (5) and at a position corresponding to the connection between the cooling water reflux channel (21), the cooling channel (13) and the first mounting groove (15) and the plunger cavity (5).

5. A self-cooling cylinder structure of a plunger pump according to claim 4, characterized in that: A sealing ring is embedded in the outer side wall of the auxiliary water seal seat (11).

6. A self-cooling cylinder structure of a plunger pump according to claim 4, characterized in that: A plurality of water holes (12) are arranged along the circumference of the water ring (9).

7. The self-cooling cylinder structure of a plunger pump according to claim 4, characterized in that: The inner diameter of the water passing ring (9) is smaller than the outer diameter of the plunger.

8. A plunger pump, characterized in that: It comprises a crankcase and the self-cooling cylinder structure according to any one of claims 1-7.

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